阅读说明：本技术 吸收性物品 (Absorbent article ) 是由 川口宏子 只井智浩 于 2019-09-10 设计创作，主要内容包括：本发明的吸收性物品中,正面片(12)在其非肌肤相对面与和该非肌肤相对面接触的部件接合。正面片(12)的非肌肤相对面中被接合的区域具有：中央低接合区域(21),其位于该正面片(12)的宽度方向中央区域且接合力相对较低；和一对侧部高接合区域(23),其位于该正面片(12)的宽度方向侧部区域并与该中央低接合区域(21)相邻,并且接合力相对较高。正面片(12)添加有护肤剂。(In the absorbent article of the present invention, the topsheet (12) is joined to a member that is in contact with the non-skin-facing surface on the non-skin-facing surface. The region of the front surface sheet (12) that is joined to the non-skin-facing surface has: a central low bonding region (21) which is located in a widthwise central region of the front sheet (12) and has a relatively low bonding force; and a pair of side high-joining regions (23) which are located in the width-direction side regions of the front sheet (12) and adjacent to the central low-joining region (21), and which are relatively high in joining force. The front sheet (12) is added with skin care agent.)

1. An absorbent article characterized by:

the topsheet is joined at its non-skin-facing surface to a member in contact with the non-skin-facing surface,

the region of the non-skin-facing surface of the top sheet to which the member in contact with the non-skin-facing surface is joined has: a central low bonding region which is located in a central region in a width direction of the front sheet and has a relatively low bonding force; and a pair of side high joining regions which are located in the widthwise side regions of the front sheet and adjacent to the central low joining region, and which are relatively high in joining force,

the front sheet is added with skin care agent.

2. The absorbent article of claim 1, wherein:

the skin care agent is a plant extract.

3. The absorbent article of claim 2, wherein:

the skin care agent is Hamamelis virginiana extract.

4. The absorbent article according to any one of claims 1 to 3, wherein:

the skin care agent is added to the constituent fibers of the top sheet.

5. The absorbent article according to any one of claims 1 to 4, wherein:

a pair of leakage-proof cuffs are provided on both sides of the skin-facing surface of the front sheet in the longitudinal direction, and the central low-bond region is located between the pair of leakage-proof cuffs.

6. The absorbent article according to any one of claims 1 to 5, wherein:

the central low-engagement area is located opposite both the urine and feces excretions of the wearer when worn.

7. The absorbent article according to any one of claims 1 to 6, wherein:

the topsheet is added with the skin care agent in the region overlapping the central low-juncture area.

8. The absorbent article according to any one of claims 1 to 7, wherein:

the skincare agent is added to the area of the front sheet that locally overlaps the central low-junction area.

9. The absorbent article according to any one of claims 1 to 8, wherein:

when the area of the central low-junction region is S1 and the area of the region overlapping the central low-junction region to which the skin care agent is added in the front sheet is S2, the ratio S2/S1 of S2 to S1 is 0.3 or more and 1.0 or less.

10. The absorbent article of claim 9, wherein:

the area S1 of the central low bonding region is 300cm²Above and 700cm²The following.

11. The absorbent article of claim 9 or 10, wherein:

the area S2 of the region of the front sheet to which the skin care agent is added and which overlaps with the central low-junction region is 200cm²Above and 700cm²The following.

12. The absorbent article according to any one of claims 1 to 11, wherein:

when the area of the central low joining region is S1 and the area of the side high joining region is S3, the ratio S3/S1 of S3 to S1 is 0.07 or more and 0.7 or less.

13. The absorbent article of claim 12, wherein:

the area S3 of the side high-joining region is 50cm²Above and 200cm²The following.

14. The absorbent article according to any one of claims 1 to 13, wherein:

the central low-joined region is in the range of 40 to 85% of the total width W of the front sheet, with the center being a width-direction bisector line that bisects the total width of the front sheet and extends in the longitudinal direction.

15. The absorbent article according to any one of claims 1 to 14, wherein:

the length L1 in the longitudinal direction of the central low-junction region is 40% or more and 100% or less with respect to the entire length L in the longitudinal direction of the front sheet.

16. The absorbent article of claim 15, wherein:

the length L1 in the longitudinal direction of the central low-junction region is 180mm or more and 450mm or less.

17. The absorbent article according to any one of claims 1 to 16, wherein:

the length W1 in the width direction of the central low-joined region is 64mm to 136 mm.

18. The absorbent article according to any one of claims 1 to 17, wherein:

the width-directional length W3 of the side high-joined region is 15% or more and 60% or less with respect to the entire width-directional length W of the topsheet.

19. The absorbent article according to any one of claims 1 to 18, wherein:

in the central low-joined region, the front sheet and the member in contact with the front sheet were evaluated to be peelable by a rubbing test, and in the side high-joined regions, the front sheet and the member in contact with the front sheet were not peelable by scraping under the same conditions.

20. The absorbent article according to any one of claims 1 to 19, wherein:

the difference in bonding strength between the central low-bonding region and the side high-bonding regions when dry is 0.5N/50mm or more.

21. The absorbent article of claim 20, wherein:

the difference in bonding strength between the central low-bonding region and the side high-bonding regions when dry is 2.3N/50mm or less.

22. The absorbent article according to any one of claims 1 to 21, wherein:

hot melt adhesive is added to the central low bonding area and the side high bonding areas,

when the grammage of the hot melt adhesive in the central low joining region is B1 and the grammage of the hot melt adhesive in the side high joining region is B2, the ratio B2/B1 of B2 to B1 is 1.2 or more.

23. The absorbent article of claim 22, wherein:

when the grammage of the hot melt adhesive in the central low joining region is B1 and the grammage of the hot melt adhesive in the side high joining region is B2, the ratio B2/B1 of B2 to B1 is 2.5 or less.

24. The absorbent article according to any one of claims 1 to 23, wherein:

applying a hot melt adhesive to the central low bond region and heat sealing the side high bond regions.

25. The absorbent article according to any one of claims 1 to 24, wherein:

the bonding strength of the central low bonding region during drying is 1.0N/50mm or less.

26. The absorbent article of claim 25, wherein:

the bonding strength of the central low bonding region during drying is 0.4N/50mm or more.

27. The absorbent article according to any one of claims 1 to 26, wherein:

the bonding strength of the central low-bonding region in the wet state is 0.5N/50mm or less.

28. The absorbent article of claim 27, wherein:

the bonding strength of the central low-bonding region in the wet state is 0.1N/50mm or more.

29. The absorbent article according to any one of claims 1 to 28, wherein:

the mass of the skin care agent per unit area in the central low junction region is 0.00001g/m²Above and 0.05g/m²The following.

30. The absorbent article according to any one of claims 1 to 29, wherein:

the front sheet is composed of at least 2 fiber layers, and has a skin-side fiber layer disposed at a position closest to the skin of the wearer and a non-skin-side fiber layer disposed at a position farther from the skin of the wearer than the skin-side fiber layer,

the skin care agent is added to the skin-side fibrous layer.

31. The absorbent article of claim 30, wherein:

the skin-side fibrous layer has a higher fiber density than the non-skin-side fibrous layer, and the skin care agent is added thereto.

32. The absorbent article of claim 30 or 31, wherein:

the skin-side fibrous layer has a fiber density that is 1.25 times or more and 8.0 times or less of the fiber density of the non-skin-side fibrous layer.

33. The absorbent article of any one of claims 30-32, wherein:

the skin side fiber layer has a fiber density of 250 fibers/mm²Above and 400 roots/mm²The following.

34. The absorbent article of any one of claims 30-33, wherein:

the skin-side fibrous layer has a smaller fineness of the constituent fibers than the non-skin-side fibrous layer.

35. The absorbent article of any one of claims 30-34, wherein:

the fineness of the constituent fibers of the skin-side fiber layer is 1.0dtex or more and 3.0dtex or less.

36. The absorbent article according to any one of claims 1 to 35, wherein:

the front sheet has an MD bulk softness of 0.5cN to 7.0 cN.

37. The absorbent article according to any one of claims 1 to 36, wherein:

further comprises an absorbent core having a bending guide part extending in a longitudinal direction thereof,

the bent guide portion is located at a position overlapping the central low joining region in a plan view.

38. The absorbent article of claim 37, wherein:

as the bend guide portion, the absorbent core includes: a central bending guide part positioned in the central area in the width direction; and a pair of side bending guide parts positioned at both sides of the central bending guide part in the width direction,

the central bend guide overlaps the central low engagement area,

when the cross section of the absorbent core in the width direction is observed, the absorbent core is bent in a W shape such that the central bending guide portion is a peak portion and the pair of side bending guide portions are valley portions.

39. The absorbent article of claim 38, wherein:

the distance between one of the side bending guide portions and the central bending guide portion is the same as the distance between the other of the side bending guide portions and the central bending guide portion.

40. The absorbent article of claim 38 or 39, wherein:

the side bending guide portions are formed at positions symmetrical with respect to a widthwise bisecting line that bisects the entire widthwise length of the absorbent core.

41. The absorbent article according to any one of claims 37 to 40, wherein:

the length of the bending guide part in the length direction is more than 50mm and less than 350 mm.

42. The absorbent article according to any one of claims 37 to 41, wherein:

the width of the bending guide part is more than 1mm and less than 20 mm.

43. The absorbent article according to any one of claims 1 to 42, wherein:

further comprises an absorbent core having a stomach-side portion disposed on the wearer's excretory part and the stomach-side portion of the wearer, a crotch portion disposed on the crotch part, and a back-side portion disposed on the back side,

the absorbent core having a high grammage region and a low grammage region having a relatively lower grammage than the high grammage region,

the low grammage region is formed in the back side portion and located at a position overlapping the central low-joining region in a plan view.

44. The absorbent article of claim 43, wherein:

the length of the high grammage region in the longitudinal direction is 50% or more and 90% or less with respect to the total length L4 of the absorbent core in the longitudinal direction.

45. The absorbent article of claim 43 or 44, wherein:

the length L16 in the longitudinal direction of the low grammage region is 10% or more and 50% or less with respect to the total length L4 in the longitudinal direction of the absorbent core.

46. The absorbent article of any one of claims 43-45, wherein:

the grammage of the high grammage region is 120% or more and 250% or less with respect to the grammage of the low grammage region.

47. The absorbent article of any one of claims 43-46, wherein:

the gram weight of the low gram weight area is 100g/m²Above and 600g/m²The following.

48. The absorbent article of any one of claims 43-47, wherein:

the grammage of the high grammage region is 150g/m under the condition that the grammage is higher than that of the low grammage region²Above and 900g/m²The following.

49. The absorbent article according to any one of claims 1 to 48, wherein:

a pair of leakage-proof cuffs are provided on both sides of the skin-facing surface of the front sheet in the longitudinal direction, and an absorbent body and a back sheet are provided as members which are in contact with the non-skin-facing surface of the front sheet,

the central low-joined region joins a widthwise central region of the topsheet and a widthwise central region of the absorbent body,

the side high-joined region joins a region of the absorbent body and the back sheet located in the vicinity of the base end portion of the leakage prevention cuff to the front sheet.

50. The absorbent article according to any one of claims 1 to 49, wherein:

the member contacting the non-skin-facing surface of the top sheet includes an absorbent body,

a sub-sheet made of nonwoven fabric or the like is disposed between the front sheet and the absorbent body, and the front sheet is joined to the sub-sheet.

Technical Field

The present invention relates to an absorbent article such as a disposable diaper and a sanitary napkin.

Background

In order to suppress the occurrence of skin problems such as skin rash, absorbent articles in which a skin care agent is incorporated into a member constituting an absorbent article such as a disposable diaper have been proposed. For example, the present applicant previously proposed an absorbent article as follows: a plant extract having a skin-care effect and substantially not having a decomposition effect with respect to a super absorbent polymer is added to a predetermined part of an absorbent article, and the plant extract is present in a state of being transferred from the predetermined part to the skin of a wearer and being able to adhere thereto (patent document 1). The plant extract is added to the surface layer of the absorption layer together with the leakage-proof layer.

Patent document 2 describes an absorbent article including a base portion and a front sheet having a convex portion protruding from the base portion toward a skin-facing surface side, wherein a weak acidifying agent composed of a plant-derived component is contained in a top portion and a side wall portion of the convex portion, and the fiber density of the side wall portion is lower than the fiber density of the top portion. According to patent document 2, a weak acid agent is attached to the surface of the skin-facing surface side of the topsheet.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2002-

Patent document 2: japanese patent laid-open publication No. 2018-15520

Disclosure of Invention

The present invention relates to an absorbent article in which a front sheet is joined to a member that is in contact with a non-skin-facing surface of the front sheet. In the non-skin-facing surface of the top sheet, the region to be joined to the member that is in contact with the non-skin-facing surface preferably includes: a central low bonding region which is located in a central region in a width direction of the front sheet and has a relatively low bonding force; and a pair of side high-joining regions which are located in the width-direction side regions of the front sheet and adjacent to the central low-joining region, and which are relatively high in joining force. Preferably, the face sheet is added with skin care agent.

Drawings

Fig. 1 is a plan view of a disposable diaper according to an embodiment of the absorbent article of the present invention, as viewed from the skin-facing surface side, in a developed state in which elastic members of the respective portions are stretched and expanded in a planar shape.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a plan view showing the arrangement relationship of the center low-bonded region and the side high-bonded regions, the topsheet, and the absorbent body shown in fig. 2.

Fig. 4 is a diagram corresponding to fig. 2 for explaining the effect of the present invention.

Fig. 5 is a view showing a main part of another embodiment of the absorbent body of the present invention, and is a plan view showing the arrangement relationship between the absorbent core and the topsheet included in the absorbent body.

Fig. 6 is a view corresponding to fig. 4 for explaining the effect of the disposable diaper having the absorbent core shown in fig. 5.

Fig. 7 is a view showing a main part of still another embodiment of the absorbent body of the present invention, and is a plan view showing the arrangement relationship between the absorbent core and the topsheet included in the absorbent body.

Detailed Description

Skin problems are likely to occur in the excretory part such as the anus and the pudendum or the peripheral part thereof. However, since the excretion portion is a depressed portion such as a slit (hip slit) or a gluteal fold of the buttocks, and is difficult to contact with the topsheet, the skin care agent added to the topsheet is difficult to transfer to the excretion portion and the peripheral portion thereof. Patent documents 1 and 2 do not disclose a technique for improving the transferability of a skin care agent to a excretory part and its peripheral part.

Accordingly, an object of the present invention is to provide an absorbent article which can eliminate the above-described drawbacks of the prior art.

The present invention will be described below based on preferred embodiments of the present invention with reference to the accompanying drawings. Fig. 1 and 2 show a basic structure of a disposable diaper 100 as one embodiment of an absorbent article of the present invention. The diaper 100 has a longitudinal shape having a longitudinal direction X corresponding to a direction extending from the abdomen side to the back side of the wearer through the crotch portion and a transverse direction Y perpendicular to the longitudinal direction X. The diaper 100 has a crotch portion C disposed in the crotch of the wearer, and a front side portion a and a back side portion B extending in the front-back direction. The crotch portion C has a excretion portion facing portion disposed to face the excretion portion of the wearer when the diaper 100 is worn. The excretion portion-facing portion is usually located at or near the central portion in the longitudinal direction X of the diaper 100.

The diaper 100 is a pants-type diaper having a waist opening through which a waist of a wearer passes and a pair of leg openings through which lower limbs of the wearer pass. In the diaper 100, both side edges of the outer package 5 in the longitudinal direction X of the front side portion a and the back side portion B are joined to each other by a known joining means such as an adhesive, heat sealing, or ultrasonic sealing. Thereby forming the waist opening and the pair of leg openings.

Fig. 1 shows a diaper 100 in an unfolded and extended state. The "developed and stretched state" of the diaper 100 refers to a state in which both side edge portions of the outer covering 5 in the longitudinal direction X of each of the front side portion a and the back side portion B are torn from a joined state to be developed, and the elastic members of the respective portions of the diaper 100 in the developed state are stretched to be developed to a designed size (the same size as when the diaper is developed to be flat in a state in which the influence of the elastic members is completely eliminated).

The diaper 100 includes an outer package 5 and an absorbent body 10 fixed to the outer package 5. The outer package 5 has a front sheet member 5A forming the front portion a and a back sheet member 5B forming the back portion B, and the front sheet member 5A and the back sheet member 5B are joined to each other at the pair of side seals 4, 4. As shown in fig. 1, the absorbent main body 10 is stretched over and fixed to the center portion in the width direction Y of the abdomen-side sheet member 5A and the center portion in the width direction Y of the back-side sheet member 5B. The portions of the absorbent main body 10 overlapping the abdomen-side sheet member 5A and the back-side sheet member 5B are joined to the whole or part of the two sheet members 5A, 2B by a known joining means such as an adhesive.

As shown in fig. 2, the diaper 100 includes, as constituent members constituting the absorbent main body 10, a topsheet 12 positioned on the skin-facing surface side of the wearer, a backsheet 13 positioned on the non-skin-facing surface side, and an absorbent body 14 disposed between the two sheets 12, 13. In the present specification, the "skin-facing surface" is a surface of the absorbent article or a constituent member thereof (e.g., the topsheet 12) that faces the skin side of the wearer when the absorbent article is worn, i.e., a surface that is relatively close to the skin of the wearer, and the "non-skin-facing surface" is a surface of the absorbent article or a constituent member thereof that faces the side opposite to the skin side (the clothing side) when the absorbent article is worn, i.e., a surface that is relatively far from the skin of the wearer. The term "worn" as used herein refers to a state in which a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and does not include a case in which the absorbent article is displaced from the wearing position.

As the topsheet 12, a sheet having liquid permeability, such as a nonwoven fabric or a perforated film, can be used. On the other hand, as the back sheet 13, for example, a film having low liquid permeability, a spunbond-meltblown-spunbond laminated nonwoven fabric, or the like can be used. A plurality of fine pores may be provided in a liquid-impermeable film to impart water vapor permeability to the film. In the present embodiment, an outermost sheet 13a having a good texture such as a nonwoven fabric is laminated on the outer surface of the back sheet 13 for the purpose of improving the feel of the diaper.

The absorbent body 14 includes an absorbent core (not shown). The absorbent core is composed of a stacked body of hydrophilic fibers such as cellulose typified by pulp, a mixed stacked body of the hydrophilic fibers and an absorbent polymer, a stacked body of an absorbent polymer, or a laminated structure in which an absorbent polymer is supported between 2 absorbent sheets. The absorbent body 14 may or may not have a core sheet covering the absorbent core. In the case of having a core sheet, at least the skin-facing surface of the absorbent core may be covered with a liquid-permeable core sheet, or the entire surface area including the skin-facing surface and the non-skin-facing surface may be covered with the core sheet. As the core-spun sheet, for example, tissue paper made of hydrophilic fibers or nonwoven fabric having liquid permeability can be used.

The diaper 100 has a pair of leakage preventing cuffs 15, 15 extending in the longitudinal direction X on both sides of the skin-facing surface of the topsheet 12 in the longitudinal direction X. The leakage preventing cuff 15 includes a base end portion and a free end. The leakage preventive cuff 15 has a proximal end portion on the skin-facing surface side of the diaper 100 and rises from the skin-facing surface side. The leakage preventive cuff 15 is composed of a cuff forming sheet 15a continuous over the entire length of the absorbent body 14 in the longitudinal direction X, and an elastic member 15b made of silk rubber or the like disposed in an extended state at or near the free end of the leakage preventive cuff 15. One edge in the width direction of the cuff-forming sheet 15a is located at the base end of the leakage preventive cuff 15, and the other edge is located between the back sheet 13 and the outermost sheet 13 a. When the elastic member 15b is contracted in a state where the diaper 100 is worn, the leakage-preventing cuffs 15 stand up toward the body of the wearer, and liquid excreted to the topsheet 12 can be effectively prevented from spreading on the topsheet 12 and leaking to the outside in the width direction of the diaper 100. As the cuff forming sheet 15a, a material that is liquid-proof, water-repellent, and air-permeable can be used.

In the crotch portion C of the diaper 100, leg portion peripheral portions 19 arranged around the legs of the wearer are formed on the outer side of the standing portions of the leakage preventing cuffs 15a in the width direction Y. In the leg portion peripheral edge portion 19, the leg elastic members 16 are arranged in an extended state, and contraction thereof forms leg gathers that improve the fit to the leg circumferences of the wearer in the crotch portion C in the worn state.

The front-side sheet member 5A and the back-side sheet member 5B constituting the outer package 5 each include an outer sheet serving as an outer surface of the diaper, an inner sheet disposed on an inner surface side of the outer sheet, and a plurality of thread-like elastic members 17 disposed between the outer sheet and the inner sheet in a stretched state. By contraction of the elastic member 17, the fit to the portion disposed at the waistline and waist of the wearer is improved.

As shown in fig. 2, the topsheet 12 is joined to a member that is in contact with the non-skin-facing surface on the non-skin-facing surface. In detail, the topsheet 12 is in contact with the absorbent body 14. The front sheet 12 is in contact with the back sheet 13 on the outer side in the width direction Y than the absorbent body 14. The topsheet 12 and the members contacting the non-skin-facing surface of the topsheet 12 are joined to each other by a known joining means. Known joining means include various adhesives such as hot melt adhesives, and welding means such as heat sealing, ultrasonic sealing, and high-frequency sealing.

As shown in fig. 2 and 3, the region of the non-skin-facing surface of the top sheet 12 to which the other members are joined has a central low-joined region 21 and a pair of side high-joined regions 23 sandwiching the central low-joined region 21. The central low-bonded region 21 is a bonded region which is located in the widthwise central region of the front sheet 12 and has a relatively low bonding force. The side high-joined regions 23 are joined regions that are located in the width-direction side regions of the front sheet 12 and adjacent to the central low-joined region 21 and have relatively high joining force. The central low-bond region 21 and the side high-bond regions 23 each extend in the longitudinal direction of the diaper 100. In the present embodiment, as shown in fig. 2, the central low-joined region 21 joins the widthwise central region of the topsheet 12 and the widthwise central region of the absorbent body 14. On the other hand, each side high-joined region 23 joins the width direction side region of the front sheet 12, the width direction side region of the absorbent body 14, and a region of the back sheet 13 located near the base end portion of the containment cuff 15.

The front sheet 12 is added with skin care agent. The skin care agent has the functions of protecting and curing the skin of a wearer. By adding the skin care agent to the topsheet 12, the skin care agent is transferred from the topsheet 12 to the skin of the wearer in the worn state of the diaper 100, and a skin care effect is exhibited. In the present embodiment, as described later, the skin care agent is smoothly transferred, and therefore, the skin care effect can be more effectively exhibited. Examples of skin care agents include moisturizers such as various plant extracts, collagen, natural moisturizing ingredient (NMF), 1, 3-butylene glycol, propylene glycol, dipropylene glycol, and glycerin; arginine, guanidine derivatives (e.g., organic acid salts of 2- (2-hydroxyethoxy) ethylguanidine (e.g., succinate, glycolate, lactate, malate, citrate, tartrate, etc.)) and the like; antiinflammatories such as guaiazulene, tannin, gallic acid derivatives, etc.; materials used as skin-moisturizing (emollient) agents in the cosmetic field, and the like.

Specific examples of the plant extract include oat extract, seaweed (sea oak) extract, grapefruit extract, witch hazel (hamamelis virginiana) extract, sanguisorba officinalis extract, hiba arborvitae extract, aloe extract, phellodendron bark extract, equisetum arvense extract, chamomile extract, eucalyptus extract, peach leaf extract, and the like. From the viewpoint of obtaining a high skin care effect, a grapefruit extract, a witch hazel extract, a hiba extract, an aloe extract, a phellodendron extract, a eucalyptus extract, or a peach leaf extract is preferably used, and a witch hazel extract is more preferably used.

The plant extract can be extracted, for example, by pulverizing the whole plant or one or more parts of leaves, bark, roots and branches of various plants, with or without drying, and then extracting with a solvent at normal temperature or under heating, or using an extraction device such as a soxhlet extractor. The plant extract is preferably an extract using 1, 3-butanediol, because an explosion-proof measure is not required even when heat treatment is performed during the production process, and the decrease in absorption performance can be suppressed even when the plant extract is applied to the top sheet 12.

Generally, the plant extract contains not only the effective components but also solvent components and water used for extraction. The amount of the effective component of the plant extract in this state (the amount after removal of volatile solvent components and water) may be about 0.001 to 5% by mass. When 1, 3-butanediol is used as the solvent component for extraction, the total of the effective component of the plant extract and 1, 3-butanediol may be in the above range. The amount of the active ingredient of the plant extract is preferably about 0.001 to 10% by mass relative to the amount of the solvent component.

Specific examples of skin care agents used as emollients include liquid paraffin and siliconeOil, animal and vegetable oil (olive oil, jojoba oil, safflower oil, squalane, squalene, etc.), monoglyceride, diglyceride, triglyceride, aliphatic ether (tetradecyl-1, 3-dimethylbutyl ether, hexadecyl-1, 3-dimethylbutyl ether, octadecyl-1, 3-dimethylbutyl ether, hexadecyl-1, 3-methylpropyl ether, octadecyl-1, 3-methylpropyl ether, etc.), isostearyl cholesterol ester, paraffin, C₁₂～C₂₂Fatty acid, C₁₂～C₄₄Fatty acid ether, C₁₂～C₂₂Fatty alcohol, vaseline, sorbitan fatty acid ester (any of monoester, diester and triester), polyoxyethylene sorbitan fatty acid ester (any of monoester, diester and triester), metal soap (magnesium stearate, etc.), sucrose fatty acid ester, cyclodextrin fatty acid ester, silicone-based resin, emollient or emulsion (deposition) composition containing emollient and fixing agent used in the invention described in jp 2004-255164 a or jp 2012-143543 a.

The above hydrophobic skin care agents can be used alone in 1 kind, or in combination with 2 or more kinds.

As described above, the front sheet 12 is joined to other components at the central low-joining region 21 and the side high-joining regions 23. Therefore, when a frictional force is applied to the topsheet 12 in the worn state of the diaper 100 or the topsheet 12 is wetted with a body fluid, the portion of the topsheet 12 corresponding to the central low-bond region 21 is peeled off from the absorbent body 14, which is a member bonded to the topsheet 12. On the other hand, in the front sheet 12 at the portions corresponding to the side high-joined regions 23, the joining of the front sheet 12 and the member in contact with the non-skin-facing surface thereof is maintained. As a result, the widthwise central region of the topsheet 12 is separated from the absorbent body 14 and is in sufficient contact with the skin of the wearer. In particular, as shown in fig. 4, the widthwise central region of the front panel 12 enters a depressed portion such as a hip slit or a hip cleft accompanying the movement of the wearer, and sufficiently contacts a excretory part such as an anal region or a pudendum region or a peripheral part thereof. As a result, the skin care agent applied to the topsheet 12 can be effectively transferred to the excretory part and the peripheral part thereof.

From the viewpoint of making it easier to get the front panel 12 into the depressed portion of the buttocks, it is preferable that the central low joining region 21 is located between the pair of leakage preventive cuffs 15, 15. In this case, the central low joining region 21 may extend not only between the pair of leakage preventing flanges 15, 15 but also outward in the width direction Y from the free end of the leakage preventing flange 15.

From the same viewpoint as described above, the central low-junction region 21 is preferably located at a position facing both the urine excretion portion and the feces excretion portion of the wearer when worn. In this case, the center low bond region 21 is located at the excretion portion-facing portion of the crotch portion C.

In the diaper 100, it is advantageous to apply a skin care agent to the skin-facing surface of the front sheet 12. From the viewpoint of facilitating transfer of the skin care agent to the skin, the topsheet 12 is preferably added with the skin care agent in a region overlapping with the central low-junction region 21. In this case, the skin care agent may be applied to a region of the front sheet 12 that partially overlaps the central low-junction region 21, or may be applied to a region of the front sheet 12 that overlaps the entire region of the central low-junction region 21. The skincare agent is applied, for example, to the constituent fibers of the front sheet 12. Specifically, the coating is applied to the surface of the fiber or mixed into the resin constituting the fiber.

From the viewpoint of improving the transferability of the skin care agent, when the area of the central low-junction region 21 is S1 and the area of the region overlapping the central low-junction region 21 to which the skin care agent is added in the topsheet 12 is S2, the ratio of S2 to S1, i.e., the value of S2/S1, is preferably 0.3 or more, more preferably 0.4 or more, further preferably 1.0 or less, more preferably 0.9 or less, further preferably 0.3 or more and 1.0 or less, more preferably 0.4 or more and 0.9 or less. Hereinafter, the region of the front sheet 12 to which the skin care agent is added and which overlaps the central low-junction region 21 is also referred to as a "skin care agent region".

From the same viewpoint as above, the area S1 of the central low-junction region 21 is preferably 300cm²Above, more preferably 400cm²Above, it is preferably 700cm²Hereinafter, more preferably 600cm²Hereinafter, it is preferably 300cm²Above and 700cm²In the following, the following description is given,more preferably 400cm²Above and 600cm²The following.

From the same viewpoint as above, the area S2 of the skin care agent region is preferably 200cm²Above, more preferably 250cm²Above, it is preferably 700cm²Hereinafter, more preferably 600cm²Hereinafter, it is preferably 200cm²Above and 700cm²Hereinafter, more preferably 250cm²Above and 600cm²The following.

From the viewpoint of more reliably obtaining the shape retention of the absorbent main body 10 when the widthwise central region of the topsheet 12 is peeled off, when the area of the central low-joined region 21 is S1 and the area of the side high-joined regions 23 is S3, the ratio of S3 to S1, i.e., the value of S3/S1, is preferably 0.07 or more, more preferably 0.09 or more, further preferably 0.7 or less, more preferably 0.6 or less, further preferably 0.07 or more and 0.7 or less, more preferably 0.09 or more and 0.6 or less.

From the same viewpoint as above, the area S3 of the side high-bond region 23 is preferably 50cm²Above, more preferably 60cm²The above, preferably 200cm²Hereinafter, more preferably 180cm²Hereinafter, it is preferably 50cm²Above and 200cm²Hereinafter, more preferably 60cm²Above and 180cm²The following.

The central low joining region 21 and the side high joining regions 23 can be defined in their ranges by the joining strength measured by the [ method for measuring joining strength ] described later.

The area of skincare agent in the central low-junction area 21 can be determined by confirming the change in the contact angle of the topsheet 12 with water. The measurement of the contact angle with water can be performed, for example, by the method described in japanese patent application laid-open No. 2015-142721. For example, in the skin care agent region to which the skin care agent having water solubility and water dispersibility is added, the contact angle of the constituent fibers of the topsheet with water is less than 90 degrees, and in the skin care agent region to which the skin care agent having no water solubility and water dispersibility is added, the contact angle of the constituent fibers of the topsheet with water is 90 degrees or more. Whether or not the skin care agent has water solubility and water dispersibility can be judged by the following method. A sheet coated with a skin care agent was immersed in water (liquid temperature 25 ℃) 10 times the mass of the sheet, and after standing for 24 hours, when the skin care agent was not dissolved at all and was not dispersed, the skin care agent was judged to have water solubility and water dispersibility. On the other hand, when the skin care agent is completely dissolved or dispersed after being left for 24 hours, it is judged that the skin care agent has water solubility or water dispersibility.

From the viewpoint of facilitating contact between the excretory part and the topsheet 12, the dimensions of the central low-bond region 21 and the side high-bond regions 23 are preferably in the following ranges.

The central low-junction region 21 is preferably in the range of 40 to 85%, more preferably 45 to 80%, and particularly preferably 50 to 75% with respect to the entire width W of the topsheet 12, with respect to the width-direction bisector CL as the center. The width direction bisector line CL is a line that bisects the entire length of the front sheet 12 in the width direction Y and extends in the longitudinal direction X (see fig. 3).

The length L1 (see fig. 3) of the central low-junction region 21 in the longitudinal direction X is preferably 40% or more, more preferably 50% or more, further preferably 100% or less, more preferably 80% or less, further preferably 40% or more and 100% or less, more preferably 50% or more and 80% or less, relative to the total length L (see fig. 3) of the topsheet 12 in the longitudinal direction X.

The length W1 (see fig. 3) of the central low-joining region 21 in the width direction Y is preferably 64mm or more, more preferably 72mm or more, and further preferably 136mm or less, more preferably 128mm or less, and further preferably 64mm or more and 136mm or less, more preferably 72mm or more and 128mm or less.

The length L1 (see fig. 3) of the central low-joining region 21 in the longitudinal direction X is preferably 180mm or more, more preferably 220mm or more, and further preferably 450mm or less, more preferably 400mm or less, and further preferably 180mm or more and 450mm or less, and more preferably 220mm or more and 400mm or less.

The length W3 in the width direction Y (see fig. 3) of the side high-bond regions 23 is preferably 15% or more, more preferably 20% or more, further preferably 60% or less, more preferably 55% or less, further preferably 15% or more and 60% or less, more preferably 20% or more and 55% or less, relative to the total length W in the width direction Y (see fig. 3) of the topsheet 12.

The length of the side high-joined region 23 in the longitudinal direction X is preferably within a preferred range of the length L1 of the central low-joined region 21 in the longitudinal direction X.

From the viewpoint of making it easier to peel off the widthwise central region of the front sheet 12, it is preferable that in the central low-joined region 21, the front sheet 12 and the member in contact with the front sheet 12 can be peeled off by a rubbing test evaluation described later, while in the side high-joined regions 23, the front sheet 12 and the member in contact with the front sheet 12 cannot be peeled off by scraping under the same conditions.

The above-described kneading test evaluation was performed in the following manner.

In the diaper, 250g of physiological saline was injected into the widthwise central region of the topsheet, and then left to stand for 5 minutes. Next, a fastener tape was cut out from Merries (registered trademark) manufactured by kao corporation, the fastening portion of the fastener tape was attached to the front sheet, and a 1kg weight was placed thereon and left standing for 10 seconds. Next, the fastener tape was peeled off from the topsheet, and peeling of the topsheet from the member in contact with the topsheet was visually confirmed. If the above-mentioned peeling is confirmed 4 times by repeating the operation 5 times or more, it is determined that the top sheet and the top sheet can be peeled.

From the same viewpoint as described above, the difference in bonding strength between the central low-bonded region 21 and the side high-bonded regions 23 is preferably 0.5N/50mm or more, more preferably 0.7N/50mm or more, further preferably 2.3N/50mm or less, more preferably 2.1N/50mm or less, further preferably 0.5N/50mm or more and 2.3N/50mm or less, and more preferably 0.7N/50mm or more and 2.1N/50mm or less. The bonding strength was measured by the method described later. The bonding strength between the center low-bonded region 21 and the side high-bonded regions 23 can be made different by using bonding means having different bonding strengths for the respective regions 21 and 23, or by using the same type of adhesive for the respective regions 21 and 23 but making the grammage of the adhesive different from each other.

[ method of measuring bonding Strength ]

The disposable diaper was stretched in an environment of 22 ℃ and 65% RH to such an extent that wrinkles formed by contraction of the respective elastic members were eliminated, and a portion where the topsheet and the entire absorbent body were overlapped in the thickness direction in a plan view was cut out and used as a measurement sample. Next, the measurement sample is set in a tensile tester (for example, Tensilon tensile tester "RTA-100" manufactured by ORIENTEC corporation) so that the front sheet of the measurement sheet is peeled off in the width direction of the diaper. For example, one end in the width direction of the topsheet is attached to an upper chuck of a tensile tester, and the absorber is attached to a lower chuck. The upper and lower chucks are set to 10mm apart. Then, the upper chuck was raised at a speed of 300mm/min while the position of the lower chuck was fixed, and the topsheet was peeled off along the width direction of the diaper. At this time, the tensile load that changes with the rise of the upper chuck, i.e., the tensile distance, is measured. In the tensile distance-tensile load curve obtained by this measurement, a relatively high tensile load continues to appear after the first maximum point, a relatively low tensile load continues to appear, and a relatively high tensile load continues to appear again as the tensile distance increases. That is, the tensile load was varied in 3 stages. In the tensile distance-tensile load curve, the first maximum point appearing first after the start of measurement is set as the initial point, and the range in which the tensile load of the same degree as the 1 st maximum point is observed is set as the 1 st stage. The range in which a relatively small tensile load is observed after stage 1 as compared to this stage 1 is taken as stage 2. The range in which a relatively large tensile load is observed after the 2 nd stage compared to the 2 nd stage is taken as the 3 rd stage. In stage 1, the integral average value of the tensile load within +10mm from the point where the first maximum point is displayed is taken as the joining strength of one side high-joined region. In stage 2, the integrated average value of the tensile load within +10mm from the point showing the earliest maximum point was taken as the joining strength of the central low joining region. In stage 3, the integrated average value of the tensile load within +10mm from the point showing the earliest maximum point is taken as the joining strength of the other side high-joining region. Unless otherwise specified, the bonding strength was measured using a dried measurement piece. The "bonding strength in dry state" described later is the bonding strength of the measurement sheet in dry state, and the "bonding strength in wet state" described later is the bonding strength of the measurement sheet in wet state. The "wet state" refers to a state in which the entire measurement sample is immersed in water.

In the present embodiment, the joining force of the center low joining region 21 and the side high joining region 23 can be adjusted by applying the hot melt adhesives 20a and 20b to the center low joining region 21 and the side high joining region 23 (see fig. 2). For example, when the grammage of the hot melt adhesive 20a in the central low joining region 21 is B1 and the grammage of the hot melt adhesive 20B in the side high joining region 23 is B2, the ratio of B2 to B1, that is, the value of B2/B1 is preferably 1.2 or more, more preferably 1.3 or more, and further preferably 2.5 or less, more preferably 2.4 or less, and further preferably 1.2 or more and 2.5 or less, more preferably 1.3 or more and 2.4 or less. In this way, the side high-bond regions 23 can be made higher in bond strength than the central low-bond region 21.

Instead of applying the hot melt adhesive to the center low joining region 21 and the side high joining regions 23, the hot melt adhesive may be applied to the center low joining region 21 and the side high joining regions 23 may be heat sealed.

From the viewpoint of further improving the skin care effect by bringing the topsheet 12 into contact with the excretory part when the topsheet becomes wet with excreta, the bonding strength of the central low-bond region 21 is preferably lower when wet than when dry. In this case, the bonding strength of the central low bonding region 21 at the time of drying is preferably 0.4N/50mm or more, more preferably 0.5N/50mm or more, further preferably 1.0N/50mm or less, more preferably 0.9N/50mm or less, further preferably 0.4N/50mm or more and 1.0N/50mm or less, more preferably 0.5N/50mm or more and 0.9N/50mm or less. The bonding strength of the central low-bonded region 21 in the wet state is preferably 0.1N/50mm or more, more preferably 0.15N/50mm or more, further preferably 0.5N/50mm or less, more preferably 0.45N/50mm or less, further preferably 0.1N/50mm or more and 0.5N/50mm or less, more preferably 0.15N/50mm or more and 0.45N/50mm or less.

When the bonding strength of the central low bonding region 21 is different between dry and wet, for example, an adhesive of a type whose bonding strength changes between dry and wet can be used. As such an adhesive, an adhesive having a bonding strength in the above range can be suitably used.

From the viewpoint of making the skin care agent more easily transferred to the skin, the mass of the skin care agent per unit area of the central low-junction region 21 is preferably 0.00001g/m²Above, more preferably 0.00005g/m²Above, particularly preferably 0.0001g/m²The above, and preferably 0.05g/m²The amount of the surfactant is more preferably 0.01g/m or less²The amount of the surfactant is preferably 0.005g/m or less²Hereinafter, it is preferably 0.00001g/m²Above and 0.05g/m²The amount of the surfactant is more preferably 0.00005g/m²Above and 0.01g/m²The amount of the surfactant is preferably 0.0001g/m or less²Above and 0.005g/m²The following. The mass of the skin care agent per unit area can be determined by the following method.

[ method of measuring the quality of skin-care agent per unit area ]

300mm was cut from the portion of the front sheet overlapping the central low-bond region determined by the above [ method for measuring bond strength ]²The above assay chip. The cutting area at one position is less than 300mm²In the case of (2), the measurement piece is cut from a plurality of places so that the total area thereof is 300mm²The above. Next, the test piece is subjected to a multi-step solvent extraction process from a non-polar solvent to a polar solvent to separate the skin care agent present in the test piece and obtain a solution containing a single composition. Drying and solidifying the obtained solution, and combining the above-mentioned materials¹H-NMR (nuclear magnetic resonance), IR (infrared spectrophotometry), LC (liquid chromatography), GC (gas chromatography), MS (mass spectrometry), GPC (gel permeation chromatography), fluorescent X-ray, etc. to identify skin care agent chemistryAnd (5) structure. Furthermore, a standard curve is prepared by a known analysis method such as GC or LC using a preparation having a specific chemical structure as a standard substance, and the skin care agent in the measurement sheet is quantified. Based on the quantitative determination results, the area per unit area (1 mm) was determined²) The quality of the skin care agent. When a plurality of skin care agents are present in the measurement sheet, the mass of each skin care agent is summed up to obtain the mass per unit area (1 mm)²) The total mass of the skin care agents (2) is defined as the mass of the skin care agent per unit area.

The front sheet 12 may be a sheet having a single-layer structure or a sheet having a laminated structure in which 2 or more fiber layers are laminated. When the topsheet 12 has a laminate structure, each of the fibrous layers in the laminate structure is composed of a skin-side fibrous layer disposed at a position closest to the skin of the wearer and a non-skin-side fibrous layer disposed at a position farther from the skin of the wearer than the skin-side fibrous layer. In the case where the topsheet 12 has a laminate structure in which 3 or more fibrous layers are laminated, the topsheet 12 has 1 skin-side fibrous layer and 2 or more non-skin-side fibrous layers forming the skin-facing surface.

From the viewpoint of improving the transferability of the skin care agent to the skin, it is preferable to add the skin care agent to the skin-facing surface side of the topsheet 12, and in the case where the topsheet 12 has a laminate structure, it is preferable to add the skin care agent to the skin-side fibrous layer.

When the topsheet 12 has a laminate structure, the skin-side fibrous layer preferably has a higher fiber density than the non-skin-side fibrous layer and is added with a skin care agent. With this configuration, the skin care agent is easily retained in the skin-side fibrous layer by capillary force, and the transfer of the skin care agent to the skin can be improved. From the viewpoint of more reliably exerting such an effect, the fiber density of each of the skin-side fibrous layer and the non-skin-side fibrous layer is preferably in the following range. The fiber density of the skin-side fibrous layer is preferably 1.25 times or more, more preferably 1.5 times or more, further preferably 8.0 times or less, more preferably 7.0 times or less, further preferably 1.25 times or more and 8.0 times or less, more preferably 1.5 times or more, relative to the fiber density of the non-skin-side fibrous layerAbove and 7.0 times or less. The skin-side fibrous layer preferably has a fiber density of 250 fibers/mm²Above, more preferably 270 roots/mm²Above, it is preferably 400 pieces/mm²More preferably 380 pieces/mm or less²Hereinafter, it is also preferable that the number of the cells is 250/mm²Above and 400 roots/mm²Hereinafter, 270 roots/mm are more preferable²Above 380 pieces/mm²The following. The fiber density of the non-skin-side fiber layer is preferably 50 fibers/mm²Above, more preferably 70 pieces/mm²The above, preferably 200 roots/mm²Hereinafter, more preferably 180 pieces/mm²Hereinafter, it is preferably 50 pieces/mm²Above and 200 pieces/mm²Hereinafter, more preferably 70 roots/mm²Above 180 pieces/mm²The following. The fiber density of each fiber layer can be determined by the following method.

[ method of measuring fiber Density ]

The cut surface of the front sheet 2 is adjusted so as to be observable under magnification using a scanning electron microscope (the magnification (150 to 500 times) at which the cross section of about 30 to 60 fibers can be measured). in the observation field of the cut surface, the area per fixed field of view (0.02 mm) is measured by image analysis²) The area occupied by the medium fibers. Specifically, the obtained image is subjected to binarization by setting a threshold value at a luminance boundary between a fiber and a portion where no fiber is present, using image processing software such as ImageJ. In general, when binarization is performed with white and black, fibers are white, and a portion where no fiber is present is black, and therefore, in the thickness direction of the measurement object (topsheet), a region having the most white portion can be recognized as a skin-side fibrous layer, and a region having more black portions than the skin-side fibrous layer can be recognized as a non-skin-side fibrous layer. Then, per fixed area (0.02 mm) was calculated²Left and right) of the cut fiber, and the number of the cut fiber sections is converted to 1mm per fiber²Number of cross sections (root/mm) of the fiber(s)²). The measurement was performed at any 3 of the front sheet, and the average value of them was taken as the fiber density. As the scanning electron microscope, for example, JCM-5100 (trade name) manufactured by Nippon electronics Co., Ltd)。

When the topsheet 12 has a laminated structure, the skin-side fibrous layer preferably has a smaller fineness of the constituent fibers than the non-skin-side fibrous layer. In such a configuration, since the fineness of the constituent fibers of the non-skin-side fiber layer is relatively large, the bonding area between the non-skin-facing surface of the topsheet 12 and the member bonded to the topsheet 12 is small, and the topsheet 12 is more likely to be peeled off in the central low-bonded region 21. Further, since the fineness of the constituent fibers of the skin-side fibrous layer is relatively small, the skin is less likely to be painful when the peeled topsheet 12 enters the excretory part of the wearer. From the viewpoint of more reliably achieving such an effect, the fineness of the constituent fibers of the skin-side fibrous layer and the non-skin-side fibrous layer is preferably in the range below. The fineness of the constituent fibers of the skin-side fiber layer is preferably 1.0dtex or more, more preferably 1.3dtex or more, further preferably 3.0dtex or less, more preferably 2.5dtex or less, further preferably 1.0dtex or more and 3.0dtex or less, more preferably 1.3dtex or more and 2.5dtex or less. The fineness of the constituent fibers of the non-skin-side fiber layer is preferably 3.3dtex or more, more preferably 4.0dtex or more, further preferably 10.0dtex or less, more preferably 7.0dtex or less, further preferably 3.3dtex or more and 10.0dtex or less, more preferably 4.0dtex or more and 7.0dtex or less. When the topsheet 12 has a plurality of non-skin-side fibrous layers, the fineness of the constituent fibers of each non-skin-side fibrous layer is preferably in the above range. The fineness of the fibers was measured as follows.

[ method for measuring fineness of fiber ]

Cutting the front sheet into pieces of 50mm × 100mm (area 5000 mm)²) The rectangular shape of (2) was used as a sample for measurement. Next, the cross section of the measurement sample was observed, and the fiber thickness was actually measured using an electron microscope for 10 standard fibers at positions spaced apart from the skin-facing surface by 0.2mm intervals in the thickness direction of the measurement sample, and the average value Dn (μm) of the fiber thickness was calculated. Next, the constituent resin of the standard fiber at a position spaced apart from the skin-facing surface by 0.2mm in the thickness direction was identified, and the theoretical fiber existence density Pn (g) was determined using a Differential Scanning Calorimeter (DSC)/cm³). Based on the obtained average value Dn (μm) of the fiber thickness and the theoretical fiber existing density Pn (g/cm)³) The weight (g) per 10,000m of the fiber length was calculated, and the calculated value was taken as the fineness (dtex) of the constituent fibers of the skin-side fiber layer. The fineness of the constituent fibers of the non-skin-side fibrous layer was measured by the same method as the fineness of the constituent fibers of the skin-side fibrous layer, except that the cross section of the measurement sample was observed, and 10 standard fibers were measured at positions spaced apart from the non-skin-facing surface by 0.2mm in the thickness direction of the measurement sample.

The topsheet 12 having different fiber densities and fineness of the constituent fibers of the skin-side and non-skin-side fiber layers can be produced by appropriately selecting the thickness of the constituent fibers of each fiber layer and/or the fiber resin material. In the step of forming each fiber layer, the web serving as the skin-side fiber layer is heated and compressed, whereby a front sheet having skin-side fibers with a relatively high fiber density can be produced.

As the surface shape of the front sheet 12, various shapes known in the art can be adopted without particular limitation. For example, the front sheet 12 may have flat skin-facing surfaces and non-skin-facing surfaces, but it is preferable that either or both of the skin-facing surface and the non-skin-facing surface have an uneven shape. When the surface of the topsheet other than the skin-facing surface has irregularities, the joining area between the topsheet 12 and the member to be joined to the topsheet 12 in the central low joining region 21 is reduced, and therefore the topsheet 12 can be easily peeled. Further, in the case where the surface of the topsheet facing the skin has irregularities, the contact area between the peeled topsheet 12 and the excretory part is small, and therefore, the topsheet 12 is less likely to cause pain in the skin when it enters the excretory part of the wearer. The topsheet having the above-described uneven shape includes a topsheet having a plurality of protrusions formed in a scattered manner on either or both of the skin-facing surface and the non-skin-facing surface of the topsheet, or a topsheet having protrusions and grooves alternately formed therein and extending in one direction. The convex portion and the convex strip portion may be hollow or solid. The front sheet having the above-described uneven shape can be produced by the production method described in, for example, japanese patent application laid-open nos. 2015-112343 and 2016-117977.

The MD bulk softness of the topsheet 12 is preferably 7.0cN or less, more preferably 6.5cN or less, and particularly preferably 6.0cN or less, from the viewpoint of not causing a feeling of discomfort when the topsheet 12 peeled from the absorbent body 14 enters the excretory part of the wearer. The lower limit of the MD bulk softness is preferably as close to 0, and is preferably 0.5cN or more from the viewpoint of stable production in the production of a diaper. The MD bulk softness was measured by the following measurement method.

[ method of measuring MD bulk softness ]

The MD bulk softness was measured by cutting a front sheet 150mm in the CD direction along the orientation direction of the constituent fibers and 30mm in the MD direction orthogonal to the CD direction at 22 ℃ and 65% RH. The end portion of the measurement piece was fixed to the upper and lower portions by a stapler so as to be in a ring shape having a diameter of 45 mm. At this time, the staple of the stapler is made longer in the CD direction. Next, the above-mentioned annular measurement piece was set up in a cylindrical shape on a sample table using a tensile tester (for example, Tensilon tensile tester "RTA-100" manufactured by ORIENTEC corporation), and the maximum load at the time of compression from above at a compression speed of 10 mm/min by a flat plate substantially parallel to the table was measured. The measurement was performed on any 3 places cut from the front sheet, and the average value of these was taken as MD bulk softness.

Next, another embodiment of the absorbent article of the present invention will be described with reference to the drawings. In other embodiments, the description of the above embodiments can be applied as appropriate within a range not inconsistent with the above description. In fig. 5 to 7, the same components as those of the above embodiment are denoted by the same reference numerals as those of the embodiment. In the diaper 100a shown in fig. 6, a core sheet covering the absorbent core 14a is not shown for ease of explanation.

In the embodiment shown in fig. 5 and 6, the absorbent core 14a of the absorbent body 14 has the bending guide portions 30 extending in the longitudinal direction thereof, and the bending guide portions 30 are located at positions overlapping the central low joining regions 21 in a plan view (see fig. 5). The bending guide portion 30 is a portion that becomes a bending point at which the absorbent core 14a can be bent toward the skin-facing surface side or the non-skin-facing surface side when a cross section of the absorbent core 14a in the width direction Y is observed. In the present embodiment, the absorbent core 14a includes, as the bending guide portions 30, a central bending guide portion 31 located in a central region in the width direction of the absorbent core 14a and a pair of side bending guide portions 33 located on both sides in the width direction Y of the central bending guide portion 31. The central bending guide 31 is located at a position overlapping the central low joining region 21. In the case where the absorbent core includes a plurality of bending guide portions 30 as in the present embodiment, at least 1 of the plurality of bending guide portions 30 may be located at a position overlapping the central low joining region 21, and preferably the central bending guide portion 31 is located at a position overlapping the central low joining region 21.

The absorbent core 14a of the present embodiment has the bending guide portions 31 and 33, and thus, when the cross section is viewed, the absorbent core 14a is bent in a W shape such that the central bending guide portion 31 becomes a mountain portion and the pair of side bending guide portions 33 and 33 become a valley portion (see fig. 6). This makes it easy for the portion of the topsheet 12 overlapping the central bending guide 31, which is a ridge, to peel off, and for the portion overlapping the central bending guide 31 to come into close contact with a depressed portion such as a hip slit or a hip cleft, so that the adhesiveness of the topsheet 12 to the excretory part and the peripheral portion thereof is improved. In particular, the center bending guide portion 31 which becomes the peak portion overlaps the center low joining region 21, whereby the close contact property and the adhesion property can be improved. Even when the absorbent core 14a has only the central bending guide portion 31, the absorbent core can be bent so that the central bending guide portion 31 becomes a mountain portion, and therefore the adhesiveness can be improved.

From the viewpoint of more reliably achieving the above-described effects, the arrangement and size of each of the bending guide portions 31 and 33 are preferably within the following ranges.

In the case where the absorbent core 14a has the side bending guide portions 33, the distance W12 (see fig. 5) between each side bending guide portion 33 and the central bending guide portion 31 is preferably the same. That is, each of the side bending guide portions 33 is preferably formed at a position symmetrical with respect to the widthwise bisector CL1 of the absorbent core 14 a.

The lengths L11, 13 (see fig. 5) of the bending guide portions 31, 33 in the longitudinal direction X are preferably 50mm or more, more preferably 100mm or more, and further preferably 350mm or less, more preferably 300mm or less, and further preferably 50mm or more and 350mm or less, and more preferably 100mm or more and 300mm or less.

The width of each bending guide portion 31, 33, i.e., the length in the width direction Y, is preferably 20mm or less, and more preferably 15mm or less. The lower limit is preferably as close to 0, but is preferably 1mm or more, more preferably 3mm or more, from the viewpoint of bending the absorbent core. The widths of the bending guide portions 31 and 33 may be the same or different from each other.

The bend guide portion 30 may be a non-fiber-stacked portion in which the forming material of the absorbent core 14a is absent and the portion becomes a space, a low-fiber-stacked portion in which the grammage of the forming material is lower than that of the surroundings, or a compacted portion formed by compacting the forming material. The non-fiber-stacking portion may be a through hole penetrating the absorbent core 14a or a slit. The slit is a through hole having a narrow width. The compacted portion is generally formed as a recess having a smaller thickness than the surroundings. The low fiber-stacking portion means that the grammage of the above-mentioned forming material is 50g/m²The low fiber-stacking portion may or may not be a recess, as described below.

In the embodiment shown in fig. 7, the absorbent core 14b in the absorbent body 14 has a high grammage region 41 and a low grammage region 43 having a relatively lower grammage than the high grammage region 41. The low grammage region 43 is formed in the back portion B (not shown) and is located at a position overlapping the central low-joined region 21 in a plan view. With such a configuration, the portion of the low grammage region 43 of the absorbent core 14b is easily deformed along the shape of the buttocks, so that the adhesiveness between the peeled topsheet 12 and the buttocks can be improved, and the skin care agent can be further transferred to the excretory part and the peripheral part thereof.

From the viewpoint of more reliably achieving the above-described effects, the dimensions and grammage of the high grammage region 41 and the low grammage region 43 are preferably in the following ranges.

The length L15 in the longitudinal direction X of the high grammage region 41 (see fig. 7) is preferably 50% or more, more preferably 60% or more, and still more preferably 70% or more, and furthermore preferably 90% or less, more preferably 85% or less, and still more preferably 80% or less, and furthermore preferably 50% or more and 90% or less, more preferably 60% or more and 85% or less, and still more preferably 70% or more and 80% or less, relative to the total length L4 in the longitudinal direction X of the absorbent core 14 b.

The length L16 in the longitudinal direction X of the low grammage region 43 is preferably 10% or more and 50% or less, more preferably 15% or more and 40% or less, and still more preferably 20% or more and 30% or less, relative to the total length L4 in the longitudinal direction X of the absorbent core 14 b.

The grammage of the high grammage region 41 is preferably 120% or more, more preferably 140% or more, further preferably 250% or less, more preferably 230% or less, further preferably 120% or more and 250% or less, more preferably 140% or more and 230% or less, relative to the grammage of the low grammage region 43.

The grammage of the low-grammage region 43 is preferably 100g/m²Above, more preferably 150g/m²The above is more preferably 200g/m²Above, in addition, 600g/m is preferable²Hereinafter, 550g/m is more preferable²Hereinafter, it is more preferably 500g/m²Hereinafter, it is preferably 100g/m²Above and 600g/m²Hereinafter, it is more preferably 150g/m²Above and 550g/m²Hereinafter, more preferably 200g/m²Above and 500g/m²The following. On the other hand, the grammage of the high grammage region 41 is preferably 150g/m, provided that it is higher than that of the low grammage region 43²Above and 900g/m²Hereinafter, more preferably 200g/m²Above and 850g/m²Hereinafter, it is more preferably 250g/m²Above and 800g/m²The following.

Next, a preferred method for manufacturing the absorbent article of the present invention will be described. As a method of adding the skin care agent to the topsheet 12 as described above, a method of adding the skin care agent to the topsheet 12, for example, a method of feeding the skin care agent into a tank of an applicator (applicator), heating the skin care agent as necessary to improve the fluidity, and then applying the topsheet. At this time, the skin care agent is applied to the skin-facing surface of the front sheet 12 or the skin-facing surface of the skin-side fibrous layer when the front sheet 12 has a laminate structure. As a method for applying the skin care agent, for example, a die coater, a knife coater, an air knife coater, a roll coater, a bar coater, a gravure coater, a bar blade coater, a lip coater, a curtain coater, a slide bead, or the like can be applied.

From the viewpoint of facilitating adhesion of the skin care agent, the viscosity of the skin care agent is preferably 1mPa · s or more and 5000mPa · s or less as measured by the following method.

< measurement of viscosity >

The viscosity was measured in the state of the skin care agent when applied to the top sheet using a tuning fork vibration viscometer (in this embodiment, VIBRO niscometer JV5000 (manufactured by a & D) is used as a representative). Specifically, the measurement of the viscosity of the skin care agent was performed at a temperature of 36 ℃. When the skin care agent is heated to a predetermined temperature and applied, the measurement is performed in a state of the predetermined temperature. The measurement was repeated 3 times, and the average value was used as the viscosity.

As described above, the front sheet 12 can be joined to a member in contact with the front sheet 12 by a known joining means. When an adhesive is used for this joining, the adhesive is applied to the non-skin-facing surface of the top sheet 12. The adhesive may be applied by so-called full-surface application in which the adhesive is applied so that no non-application portion exists, or may be applied by an application pattern in which the adhesive is applied so that a non-application portion exists. Examples of the coating pattern include a spiral pattern, a mountain top pattern, an omega pattern, a curtain pattern, and a stripe pattern. As the method for applying the adhesive, the same method as the method for applying the skin care agent can be used.

The present invention has been described above based on preferred embodiments of the present invention, but the present invention may be combined with the above embodiments. For example, the diaper 100 may also include the bend guides 30 in the embodiment shown in fig. 5 and 6 and the absorbent core having the high grammage region 41 and the low grammage region 43 in the embodiment shown in fig. 7.

The present invention is not limited to the above embodiment, and can be modified as appropriate. For example, in the embodiment shown in fig. 1 to 4, the topsheet 12 is joined to the absorbent body 14 in contact with the non-skin-facing surface of the topsheet 12 in the central low-joined region 21 and the side high-joined regions 23, but the topsheet 12 may be joined to a member other than the absorbent body 14. For example, when a sub-sheet made of nonwoven fabric or the like is disposed between the topsheet 12 and the absorbent body 14, the topsheet 12 may be joined to the sub-sheet.

In addition, the above-described embodiments are examples in which the absorbent article of the present invention is applied to a pants-type disposable diaper, but the present invention is not limited thereto, and the present invention may be applied to an open-type disposable diaper. The present invention can also be applied to absorbent articles other than disposable diapers, such as sanitary napkins and incontinence pads.

The present invention further discloses the following absorbent article according to the above embodiment.

<1>

An absorbent article having a topsheet joined to a member in contact with a non-skin-facing surface of a topsheet on the non-skin-facing surface,

the region of the front surface sheet, which is joined to the member that is in contact with the non-skin-facing surface, includes: a central low bonding region which is located in a central region in a width direction of the front sheet and has a relatively low bonding force; and a pair of side high joining regions which are located in the widthwise side regions of the front sheet and adjacent to the central low joining region, and which are relatively high in joining force,

the face sheet is added with skin care agent.

<2>

The absorbent article according to the above <1>, wherein the skin care agent is a plant extract.

<3>

The absorbent article according to the above <2>, wherein the skin care agent is a witch hazel extract.

<4>

The absorbent article according to any one of the above <1> to <3>, wherein the skin care agent is added to the constituent fibers of the top sheet.

<5>

The absorbent article according to any one of the above <1> to <4>, wherein the front sheet has a pair of leakage preventing cuffs on both sides in the longitudinal direction of the skin-facing surface, and the central low-joined region is located between the pair of leakage preventing cuffs.

<6>

The absorbent article according to any one of the above <1> to <5>, wherein the central low-junction region is located at a position facing both a urine excretion portion and a feces excretion portion of a wearer when worn.

<7>

The absorbent article according to any one of the above <1> to <6>, wherein the skin care agent is added to the front sheet in a region overlapping with the central low-joined region.

<8>

The absorbent article according to any one of the above <1> to <7>, wherein the skin care agent is added to a region of the top sheet that partially overlaps the central low-junction region.

<9>

The absorbent article according to any one of the above <1> to <8>, wherein when the area of the central low-joined region is S1 and the area of the region overlapping the central low-joined region to which the skin care agent is added to the topsheet is S2, the ratio of S2 to S1, that is, the value of S2/S1, is 0.3 or more, preferably 0.4 or more, and 1.0 or less, preferably 0.9 or less.

<10>

As described above<9>The absorbent article, whichWherein the area S1 of the central low bonding region is 300cm²Above, preferably 400cm²Above, and in addition, 700cm²Hereinafter, preferably 600cm²The following.

<11>

As described above<9>Or<10>The absorbent article described above, wherein the area S2 of the region where the skin care agent is added to the top sheet and the region overlaps the central low-bond region is 200cm²Above, preferably 250cm²Above, and in addition, 700cm²Hereinafter, preferably 600cm²The following.

<12>

The absorbent article according to any one of <1> to <11>, wherein a ratio of S3 to S1, that is, a value of S3/S1 is 0.07 or more, preferably 0.09 or more, and 0.7 or less, preferably 0.6 or less, when an area of the central low joining region is S1 and an area of the side high joining region is S3.

<13>

As described above<12>In the absorbent article, the area S3 of the side high-bond region is preferably 50cm²Above, more preferably 60cm²The above, preferably 200cm²Hereinafter, more preferably 180cm²The following.

<14>

The absorbent article according to any one of the above <1> to <13>, wherein the central low-joined region is in the range of 40 to 85%, preferably 45 to 80%, and more preferably 50 to 75% with respect to the total length W of the topsheet in the width direction, centered on a bisector in the width direction that bisects the total length of the topsheet in the width direction and extends in the longitudinal direction.

<15>

The absorbent article according to any one of the above <1> to <14>, wherein the length L1 in the longitudinal direction of the central low-junction region is 40% or more, preferably 50% or more, and 100% or less, preferably 80% or less, relative to the total length L in the longitudinal direction of the topsheet.

<16>

The absorbent article according to the above <15>, wherein the length L1 of the central low-joined region in the longitudinal direction is 180mm or more, preferably 220mm or more, and 450mm or less, preferably 400mm or less.

<17>

The absorbent article according to any one of the above <1> to <16>, wherein the length W1 in the width direction of the central low-joined region is 64mm or more, preferably 72mm or more, and 136mm or less, preferably 128mm or less.

<18>

The absorbent article according to any one of the above <1> to <17>, wherein the width-directional length W3 of the side high-joined regions is 15% or more, preferably 20% or more, and 60% or less, preferably 55% or less, relative to the entire width W of the topsheet.

<19>

The absorbent article according to any one of the above <1> to <18>, wherein the front sheet and the member in contact with the front sheet are peelable in the central low-joined region as evaluated by a rubbing test, and the front sheet and the member in contact with the front sheet are not peelable in the side high-joined regions by scraping under the same conditions.

<20>

The absorbent article according to any one of the above <1> to <19>, wherein a difference in bonding strength between the central low-bonded region and the side high-bonded regions at the time of drying is 0.5N/50mm or more.

<21>

The absorbent article according to the above <20>, wherein the difference in bonding strength between the central low-bonded region and the side high-bonded regions when dry is 0.5N/50mm or more, preferably 0.7N/50mm or more, and 2.3N/50mm or less, preferably 2.1N/50mm or less.

<22>

The absorbent article according to any one of the above <1> to <21>, wherein a hot-melt adhesive is added to the central low joining region and the side high joining region,

when the grammage of the hot melt adhesive in the central low joining region is B1 and the grammage of the hot melt adhesive in the side high joining region is B2, the ratio of B2 to B1, that is, the value of B2/B1 is 1.2 or more.

<23>

In the absorbent article according to the above <22>, when the grammage of the hot melt adhesive in the central low-joined region is B1 and the grammage of the hot melt adhesive in the side high-joined regions is B2, the ratio of B2 to B1, that is, the value of B2/B1 is preferably 1.2 or more, more preferably 1.3 or more, and further preferably 2.5 or less, more preferably 2.4 or less.

<24>

The absorbent article according to any one of the above <1> to <23>, wherein the central low joining region is applied with a hot melt adhesive, and the side high joining regions are heat sealed.

<25>

The absorbent article according to any one of the above <1> to <24>, wherein the bonding strength of the central low bonding region at the time of drying is 1.0N/50mm or less.

<26>

The absorbent article according to the above <25>, wherein the bonding strength of the central low-bonded region when dry is preferably 0.4N/50mm or more, more preferably 0.5N/50mm or more, and further preferably 1.0N/50mm or less, more preferably 0.9N/50mm or less.

<27>

The absorbent article according to any one of the above <1> to <26>, wherein the central low-joined region has a joining strength of 0.5N/50mm or less when wet.

<28>

The absorbent article according to the above <27>, wherein the central low-joined region has a joining strength when wet of preferably 0.1N/50mm or more, more preferably 0.15N/50mm or more, and further preferably 0.5N/50mm or less, more preferably 0.45N/50mm or less.

<29>

As described above<1>～<28>The absorbent article of any one of the above items, wherein the mass of the skin care agent per unit area in the central low-joined region is 0.00001g/m²Above, preferably 0.00005g/m²Above, more preferably 0.0001g/m²Above, in addition, 0.05g/m²Below, it is preferably 0.01g/m²The concentration is more preferably 0.005g/m or less²The following.

<30>

The absorbent article according to any one of the above <1> to <29>, wherein the front sheet is composed of 2 or more fibrous layers, and has a skin-side fibrous layer disposed at a position closest to the skin of the wearer and a non-skin-side fibrous layer disposed at a position farther from the skin of the wearer than the skin-side fibrous layer,

the skin-side fiber layer is added with the skin care agent.

<31>

The absorbent article according to the above <30>, wherein the skin-side fibrous layer has a higher fiber density than the non-skin-side fibrous layer, and the skin care agent is added thereto.

<32>

The absorbent article according to the above <30> or <31>, wherein the fiber density of the skin-side fibrous layer is 1.25 times or more, preferably 1.5 times or more, and 8.0 times or less, preferably 7.0 times or less, relative to the fiber density of the non-skin-side fibrous layer.

<33>

As described above<30>～<32>The absorbent article as set forth in any one of claims, wherein the fiber density of the skin-side fiber layer is 250 fibers/mm²Above, preferably 270 roots/mm²Above, in addition, 400 roots/mm²Preferably 380 pieces/mm²The following.

<34>

The absorbent article according to any one of the above <30> to <33>, wherein the skin-side fibrous layer has a smaller fineness of the constituent fibers than the non-skin-side fibrous layer.

<35>

The absorbent article according to any one of <30> to <34> above, wherein the constituent fibers of the skin-side fiber layer have a fineness of 1.0dtex or more, preferably 1.3dtex or more, and a fineness of 3.0dtex or less, preferably 2.5dtex or less.

<36>

The absorbent article according to any one of the above <1> to <35>, wherein the front sheet has an MD bulk softness of 7.0cN or less, preferably 6.5cN or less, more preferably 6.0cN or less, and 0.5cN or more.

<37>

The absorbent article according to any one of the above <1> to <36>, further comprising an absorbent core having a bending guide portion extending in a longitudinal direction thereof,

the bent guide portion is located at a position overlapping the central low joining region in a plan view.

<38>

The absorbent article according to the above <37>, wherein the absorbent core includes, as the bend guide portion: a central bending guide part positioned in the central area in the width direction; and a pair of side bending guide parts positioned at both sides of the central bending guide part in the width direction,

the central bending guide part is overlapped with the central low jointing area,

when the cross section of the absorbent core in the width direction is observed, the absorbent core is bent in a W shape such that the central bending guide portion is a mountain portion and the pair of side bending guide portions are valley portions.

<39>

The absorbent article according to the above <38>, wherein a distance between one of the side bending guides and the central bending guide is equal to a distance between the other of the side bending guides and the central bending guide.

<40>

The absorbent article according to the above <38> or <39>, wherein the side bending guide portions are formed at positions symmetrical with respect to a widthwise bisecting line that bisects a widthwise full length of the absorbent core.

<41>

The absorbent article according to any one of <37> to <40> above, wherein the length of the bend guide portion in the longitudinal direction is 50mm or more, preferably 100mm or more, 350mm or less, preferably 300mm or less, 50mm or more and 350mm or less, preferably 100mm or more and 300mm or less.

<42>

The absorbent article according to any one of <37> to <41>, wherein the width of the bend guide portion is 20mm or less, preferably 15mm or less, and 1mm or more, preferably 3mm or more.

<43>

The absorbent article according to any one of the above <1> to <42>, further comprising an absorbent core having a stomach-side portion disposed on the stomach side of the wearer and the excretory part of the wearer, a crotch portion disposed in the crotch portion, and a back-side portion disposed on the back side,

the absorbent core has a high grammage region and a low grammage region having a relatively lower grammage than the high grammage region,

the low grammage region is formed in the back side portion and is located at a position overlapping the central low joining region in a plan view.

<44>

The absorbent article according to the above <43>, wherein the length of the high grammage region in the longitudinal direction is 50% or more, preferably 60% or more, more preferably 70% or more, and 90% or less, preferably 85% or less, more preferably 80% or less, and is 50% or more and 90% or less, preferably 60% or more and 85% or less, more preferably 70% or more and 80% or less, relative to the total length L4 in the longitudinal direction of the absorbent core.

<45>

The absorbent article according to the above <43> or <44>, wherein the length L16 in the longitudinal direction of the low grammage region is 10% or more and 50% or less, preferably 15% or more and 40% or less, and more preferably 20% or more and 30% or less, with respect to the total length L4 in the longitudinal direction of the absorbent core.

<46>

The absorbent article according to any one of <43> to <45> above, wherein the grammage of the high grammage region is 120% or more, preferably 140% or more, 250% or less, preferably 230% or less, 120% or more and 250% or less, preferably 140% or more and 230% or less, relative to the grammage of the low grammage region.

<47>

As described above<43>～<46>The absorbent article of any one of the above items, wherein the grammage of the low grammage region is 100g/m²Above, preferably 150g/m²Above, more preferably 200g/m²Above, in addition, 600g/m²Hereinafter, 550g/m is preferable²Hereinafter, it is more preferably 500g/m²Hereinafter, it is also 100g/m²Above and 600g/m²Hereinafter, it is preferably 150g/m²Above and 550g/m²Hereinafter, more preferably 200g/m²Above and 500g/m²The following.

<48>

As described above<43>～<47>The absorbent article of any one of the above items, wherein the grammage of the high grammage region is 150g/m, provided that it is higher than the grammage of the low grammage region²Above and 900g/m²Hereinafter, it is preferably 200g/m²Above and 850g/m²Hereinafter, it is more preferably 250g/m²Above and 800g/m²The following.

<49>

The absorbent article according to any one of the above <1> to <48>, wherein the front sheet has a pair of leakage preventing cuffs on both sides in the longitudinal direction of the skin-facing surface, and the front sheet includes an absorbent body and a back sheet as members which are in contact with the non-skin-facing surface of the front sheet,

the central low-joined region joins a widthwise central region of the topsheet and a widthwise central region of the absorbent body,

the side high-joined region joins a region of the absorbent body and the back sheet located in the vicinity of the base end portion of the leakage prevention cuff to the front sheet.

<50>

The absorbent article according to any one of the above <1> to <49>, wherein the absorbent member is provided as a member that contacts the non-skin-facing surface of the top sheet,

a sub-sheet made of nonwoven fabric or the like is disposed between the topsheet and the absorbent body, and the topsheet and the sub-sheet are joined together.

Industrial applicability of the invention

The absorbent article of the present invention is excellent in transferability of the skin care agent to the excretory part such as the anus and the pudendum or the peripheral part thereof.