阅读说明：本技术 吸收性物品 (Absorbent article ) 是由 德永幸子 于 2018-05-22 设计创作，主要内容包括：吸收性物品的主体(8)具有从正面片(3)侧向背面片(2)侧凹陷的挤压槽,挤压槽包含有在前后方向上延伸的一对前后方向挤压槽(10),前后方向挤压槽(10)包含高挤压部(11)和凹陷得比高挤压部(11)浅的低挤压部(12),前后方向挤压槽(10)包含：后方第1挤压槽(10b),其形成于在穿着时与穿着者的臀沟(70)对应的区域；和中央挤压槽(10a),其形成于后方第1挤压槽(10b)的前方,后方第1挤压槽(10b)中的高挤压部(11)在前后方向的每单位长度内的面积之和小于中央挤压槽(10a)中的高挤压部(11)在前后方向的每单位长度内的面积之和。(The main body (8) of the absorbent article has a pressing groove recessed from the front surface sheet (3) side to the back surface sheet (2) side, the pressing groove includes a pair of front and rear direction pressing grooves (10) extending in the front and rear directions, the front and rear direction pressing grooves (10) include a high pressing portion (11) and a low pressing portion (12) recessed shallower than the high pressing portion (11), and the front and rear direction pressing grooves (10) include: a rear 1 st pressing groove (10b) formed in a region corresponding to a wearer's gluteal cleft (70) when worn; and a central pressing groove (10a) formed in front of the rear 1 st pressing groove (10b), wherein the sum of the areas of the high pressing portions (11) in the rear 1 st pressing groove (10b) per unit length in the front-rear direction is smaller than the sum of the areas of the high pressing portions (11) in the central pressing groove (10a) per unit length in the front-rear direction.)

1. An absorbent article provided with a main body, the main body having: a liquid-permeable front sheet; a liquid-impermeable back sheet; and an absorber disposed between the front sheet and the back sheet, wherein,

the body has an elongated shape: has a predetermined length in the front-rear direction and a predetermined width in the width direction perpendicular to the front-rear direction,

the main body has a pressing groove recessed from the front sheet side to the back sheet side,

the pressing grooves include a pair of front-rear direction pressing grooves extending in the front-rear direction,

the front-rear direction pressing groove includes: a high extrusion part; and a low-squeeze portion recessed shallower than the high-squeeze portion,

the front-rear direction pressing groove includes: a rear 1 st compressed groove formed in a region corresponding to the wearer's gluteal cleft when worn; and a central pressing groove formed in front of the rear 1 st pressing groove,

the sum of the areas per unit length of the high-extrusion portions in the rear 1 st extrusion groove in the front-rear direction is smaller than the sum of the areas per unit length of the high-extrusion portions in the central extrusion groove in the front-rear direction.

2. The absorbent article of claim 1,

the groove width of the rear 1 st extrusion groove is smaller than that of the central extrusion groove.

3. The absorbent article of claim 1,

the distance between the high extrusion parts of the rear 1 st extrusion groove is larger than that between the high extrusion parts of the central extrusion groove.

4. The absorbent article of claim 1,

the front-rear direction pressing groove includes a rear 2 nd pressing groove formed at the rear of the rear 1 st pressing groove,

the sum of the areas per unit length of the high pressing portions of the rear 2 nd pressing groove in the front-rear direction is larger than the sum of the areas per unit length of the high pressing portions of the rear 1 st pressing groove in the front-rear direction.

5. The absorbent article according to claim 4,

the groove width of the rear 2 nd extrusion groove is larger than that of the rear 1 st extrusion groove.

6. The absorbent article according to claim 5,

the distance between the high extrusion parts of the rear 2 nd extrusion groove is smaller than the distance between the high extrusion parts of the rear 1 st extrusion groove.

Technical Field

The present invention relates to an absorbent article.

Background

Conventionally, as absorbent articles such as sanitary napkins, panty liners, and incontinence pads, absorbent articles in which an absorbent body is provided between a liquid-permeable front sheet and a liquid-impermeable back sheet have been known. Further, among absorbent articles, there are known absorbent articles that: which improves the fit from the portion corresponding to the bodily fluid discharge port to the region rearward and prevents the bodily fluid from leaking rearward.

For example, patent document 1 discloses an absorbent article in which: the rigidity of the left and right side regions of the center region is lower than the rigidity of the left and right side regions of each of the front center region and the rear center region.

Further, patent document 2 discloses a structure in which arc-shaped buttock deformation corresponding embossments having a curvature center on the outer side in the width direction of the absorbent article are formed on both sides of the longitudinal center line, and a buttock groove corresponding emboss having a substantially inverted V-shaped portion gradually enlarged toward both sides from the position on the longitudinal center line toward the rear side is formed.

Disclosure of Invention

Problems to be solved by the invention

Patent document 1 describes the following: with the disclosed structure, the front portion and the rear portion of the absorbent article can move independently and follow the body. Patent document 2 discloses the following: the absorbent article can fit to the deformation of the buttocks at bedtime.

However, in the absorbent articles described in patent documents 1 and 2, there is still room for improvement with respect to deformation in conformity with the shape of the buttocks.

In view of the above-described problems, an object of the present invention is to provide an absorbent article that can be deformed well in accordance with the shape of the buttocks, and thereby can prevent leakage from occurring at the rear.

Means for solving the problems

A first aspect of the present invention is an absorbent article including a main body having: a liquid-permeable front sheet; a liquid-impermeable back sheet; and an absorber provided between the front sheet and the back sheet, wherein the main body has such an elongated shape that: the main body has a pressing groove recessed from the front surface sheet side to the rear surface sheet side, the pressing groove includes a pair of front-rear direction pressing grooves extending in the front-rear direction, and the front-rear direction pressing grooves include: a high extrusion part; and a low extrusion portion recessed shallower than the high extrusion portion, the forward-backward extrusion groove including: a rear 1 st compressed groove formed in a region corresponding to the wearer's gluteal cleft when worn; and a central pressing groove formed in front of the rear 1 st pressing groove, a sum of areas of the high pressing portions in the rear 1 st pressing groove per unit length in the front-rear direction being smaller than a sum of areas of the high pressing portions in the central pressing groove per unit length in the front-rear direction.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one aspect of the present invention, an absorbent article can be provided: which can be deformed well in accordance with the shape of the cleft of the buttocks, thereby preventing leakage from occurring at the rear.

Drawings

Fig. 1 is a partial cutaway view of an absorbent article according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line IV-IV in fig. 1.

Fig. 3A is a view showing deformation of the intergluteal fold corresponding region when the absorbent article according to one embodiment of the present invention is worn.

Fig. 3B is a view showing deformation of the gluteal fold corresponding region when the conventional absorbent article is worn.

Fig. 4A is an enlarged view of a central pressing groove in one embodiment of the present invention.

Fig. 4B is an enlarged view of the rear 1 st pressing groove in one embodiment of the present invention.

Fig. 4C is an enlarged view of the rear 2 nd pressing groove in one embodiment of the present invention.

Fig. 5 is a view showing an absorbent article according to another embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a partial cut-away view of an absorbent article 1 according to one embodiment of the present invention. In addition, a cross section along the line IV-IV in fig. 1 is shown in fig. 2. As shown in fig. 1 and 2, the absorbent article 1 includes a main body (absorbent article main body) 8, and the main body 8 includes: a liquid-impermeable back sheet 2; a liquid-permeable front sheet 3; and an absorbent body 4 arranged between the two sheets 2, 3. The absorbent member 4 may be covered with a cover sheet 5 made of crepe paper, nonwoven fabric, or the like in order to maintain the shape of the absorbent member 4.

As shown in fig. 1, the main body 8 has an elongated shape as follows as a whole: has a predetermined length in the front-rear direction and a substantially constant width in a direction perpendicular to the front-rear direction. In the illustrated embodiment, the absorbent article 1 has a substantially line-symmetric shape with respect to a center line CL extending in the front-rear direction. However, the structure (including the shape) of the absorbent article 1 or the main body 8 does not necessarily have to be substantially line-symmetrical. In addition, the absorbent article 1 may have wings W, W for reliably securing the absorbent article 1 to underwear when worn. In the illustrated example, the flaps W, W extend from both sides of the region of the main body 8 that includes the portion (body fluid discharge port-corresponding portion) 40 corresponding to the body fluid discharge port, but the absorbent article 1 may not include the flaps W, W.

The outer edge of the back sheet 2 and the outer edge of the front sheet 3 are joined together at the front and rear end edges of the absorbent body 4 by an adhesive such as a hot melt adhesive or by an adhesive means such as heat sealing or ultrasonic sealing. Side nonwoven fabrics 7 are provided on both side portions of the front sheet 3 side, respectively, along the front-back direction (longitudinal direction). The side nonwoven fabric 7 partially protrudes to the side of the main body 8, is laminated on the back sheet 2 that also protrudes to the side, and is joined together by an adhesive such as a hot melt adhesive, or an adhesive means such as heat sealing or ultrasonic sealing, whereby flaps W, W can be formed on both side portions of the main body 8.

As the back sheet 2, a sheet having at least water-blocking property such as an olefin resin sheet of polyethylene, polypropylene or the like can be used. A laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like may be used, or a laminated sheet of a nonwoven fabric having a water-proof film interposed therebetween and substantially ensuring liquid impermeability may be used. In addition, from the viewpoint of preventing stuffiness, it is more desirable to use a sheet having moisture permeability. As such a water-blocking/moisture-permeable sheet, a microporous sheet obtained by the following method can be used: the inorganic filler is melt-kneaded in an olefin resin such as polyethylene or polypropylene to form a sheet, and then the sheet is uniaxially or biaxially stretched.

The front sheet 3 is a liquid-permeable sheet that allows liquid such as menstrual blood, leucorrhea, and urine to rapidly permeate therethrough. As the front sheet 3, a porous or nonporous nonwoven fabric, a porous plastic sheet, or the like is suitably used. As the face fabric constituting the nonwoven fabric, for example, olefin such as polyethylene and polypropylene, synthetic fiber such as polyester and polyamide, regenerated fiber such as rayon and cuprammonium fiber, blended fiber thereof, and natural fiber such as cotton can be used alone or in combination of 2 or more of the above materials. Examples of the nonwoven fabric processing method include a spunlace method, a spunbond method, a hot-rolling method, a melt-blowing method, and a needle-punching method. Among these processing methods, the spunlace method is preferable in that a nonwoven fabric rich in flexibility can be produced, the spunbond method is preferable in that a nonwoven fabric rich in drapability can be produced, and the hot-roll method is preferable in that a bulky and flexible nonwoven fabric can be produced. Further, a core-sheath fiber, a side-by-side fiber, a split fiber, or the like, in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, may be used.

The absorbent body 4 interposed between the back sheet 2 and the front sheet 3 is not limited as long as it is a material capable of absorbing and retaining body fluid, but preferably includes cotton-like pulp and a water-absorbent polymer. As the water-absorbent polymer, super absorbent polymer particulate powder (SAP): super absorbent resin), super absorbent polymer fiber (SAF): super absorbent fiber), and a combination thereof can be used. Examples of the pulp include pulp made of cellulose fibers such as chemical pulp obtained from wood and dissolving pulp, and pulp made of artificial cellulose fibers such as rayon and acetate. As a raw material of the chemical pulp, hardwood trees, coniferous trees, and the like can be used, but coniferous trees are preferably used because of a long fiber length and the like.

Further, synthetic fibers may be mixed in the absorbent body 4. As the synthetic fibers, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof may be used, and 2 of them may be mixed and used. Further, a core-sheath fiber, a side-by-side fiber, a split fiber, or other composite fibers may be used, in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath. Further, a fiber in which hydrophobic fibers are surface-treated with a hydrophilic agent to impart affinity for body fluids may be used.

The thickness of the absorbent member 4 may be set to be in the range of 0.5 to 25mm, but is preferably in the range of 3.5 to 7.5 mm. The absorbent body 4 may not have a uniform thickness in the front surface region, and may be configured to bulge the body fluid outlet corresponding portion 40 and its vicinity and bulge a portion corresponding to the gluteal fold (gluteal fold corresponding portion) and its vicinity. Further, the absorbent body 4 is preferably manufactured by a fiber-laying or air-laying method.

As the side nonwoven fabric 7, a water repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used. For example, when the effect of preventing permeation of menstrual blood, leucorrhea, or the like, or the texture of the skin is to be improved, it is preferable to use a water repellent nonwoven fabric coated with a silicon-based, paraffin-based, or alkylchromium chloride-based water repellent agent or the like. When the absorption of menstrual blood or the like in the flap W is to be improved, a nonwoven fabric subjected to hydrophilic treatment is preferably used as a material of the nonwoven fabric. As the type of nonwoven fabric, a soft through-air nonwoven fabric which is hardly creased, hardly wrinkled, is preferable.

In order to join the side nonwoven fabric 7 and the back sheet 2 and to improve rigidity, a pressing portion (embossing) having a dot shape or a predetermined shape may be provided at a predetermined position on the outer edge of the flap W, W.

The overall length of the absorbent article 1 may be 130 to 450mm, and may be 200 to 360 mm.

The absorbent article 1 is provided with a compressed groove (also referred to as a compressed groove or an embossed groove). The pressing groove is formed as a linear groove recessed from the front sheet 3 toward the back sheet 2. The extrusion groove has the following functions: the absorbent member 4 is prevented from being twisted, the transfer of body fluid to the surface or the inside is controlled, and the shape thereof is easily deformed to fit the body. The pressing groove can be formed as follows: the laminate in which the topsheet 3 is laminated on the absorbent member 4 is passed between a pair of pressure rollers. For example, a convex roller and a flat roller may be arranged on the topsheet 3 side and the absorbent member 4 side, respectively, and the laminate may be passed through.

As shown in fig. 1, the pressing groove includes a pair of front- rear direction grooves 10, 10 extending in the front-rear direction in line symmetry with a front-rear direction center line CL of the main body as a symmetry axis. The pair of front-rear direction pressing grooves 10, 10 may extend in the front-rear direction so as to avoid a portion (body fluid discharge port corresponding portion) 40 corresponding to a body fluid discharge port such as a vaginal opening when worn, and to extend along a side of the body fluid discharge port corresponding portion 40 or to pass through a position laterally separated from the body fluid discharge port corresponding portion 40 by a predetermined distance. The front-rear direction pressing grooves 10, 10 may have a length of about 50-85% of the length of the main body. The front-rear direction pressing grooves 10, 10 may extend linearly as a whole, or may be curved in the middle as in the illustrated example. The pair of front- rear direction grooves 10, 10 need not be provided line-symmetrically. However, it is preferable that the pair of front- rear direction grooves 10, 10 be provided on both sides of the front-rear direction center line CL.

Since the pair of front-rear direction pressing grooves 10, 10 are present, the absorbent article main body 8 is easily bent from the pressing grooves (flexible axes). Therefore, when the body 8 receives forces from both legs from the sides (the direction perpendicular to the front-rear direction) during wearing, the front-rear direction pressing grooves 10, 10 serve as starting points and the region between the front-rear direction pressing grooves 10, 10 can be raised, thereby improving the fit of the body 8 to the body.

The pair of forward and backward pressing grooves 10, 10 includes: a high-extrusion portion 11; and a low-compressed part 12 (fig. 1 and 2) that is recessed shallower than the high-compressed part 11. In the drawing, the high squeezing portions 11 are shown in black, and the low squeezing portions 12 are shown in white (colorless). The pressing depth of the high pressing portion 11 and the low pressing portion 12 is not particularly limited, and the high pressing portion 11 may be a portion having a groove depth of about 0.5mm to 3mm formed relatively deeper than the bottom surface of the low pressing portion 12. In the front-rear direction pressing grooves 10, the high pressing portions 11 may be continuous or discontinuous in the front-rear direction, but are preferably discontinuous (provided so as to be separated in the front-rear direction between the plurality of high pressing portions) in order to provide the grooves with appropriate rigidity. By using a pressure roller having irregularities corresponding to a desired configuration, such a configuration of a pressing groove including a high-pressing portion and a low-pressing portion can be obtained. For example, a pressure roller can be used that: the extrusion device is provided with a convex part corresponding to the shape of the whole extrusion groove, and the convex part is provided with a fine convex part corresponding to the high extrusion part. In addition, the above-described configuration of the extrusion groove can be obtained by forming the low extrusion portion at a relatively low pressure in the region where the extrusion groove is to be formed, and then forming the high extrusion portion at a relatively high pressure in a part of the region of the formed low extrusion portion. The depth of the pressing portion can be adjusted by adjusting the pressing of the pressing roller used for forming the pressing groove.

In this example, the high-pressure portions and the low-pressure portions may be provided in other pressure grooves than the front-rear direction pressure grooves 10 and 10. In the example of fig. 1, all the extrusion grooves including the front extrusion groove 20 described later are provided with a high extrusion portion and a low extrusion portion.

In the example of fig. 1, the pair of front-rear direction pressing grooves 10 and 10 includes center pressing grooves 10a and 10a, rear 1 st pressing grooves 10b and 10b, and rear 2 nd pressing grooves 10c and 10c, which may be connected in the front-rear direction in the above-described order. The central pressing grooves 10a, the rear 1 st pressing grooves 10B, and the rear 2 nd pressing grooves 10C, 10C are provided in the central area a, the rear 1 st area B, and the rear 2 nd area C, respectively.

The length of the central pressing grooves 10a, 10a in the front-rear direction may be 60 to 110mm, the length of the rear 1 st pressing grooves 10b, 10b in the front-rear direction may be 30 to 60mm, and the length of the rear 2 nd zone pressing grooves 10c, 10c in the front-rear direction may be 30 to 60 mm.

The central region a may be a region including the bodily fluid discharge port corresponding portion 40 and substantially corresponding to a crotch portion of the wearer from a urethral orifice to an anus when worn. The rear 1 st region B is a region corresponding to the wearer's gluteal cleft, specifically, a region (gluteal cleft corresponding region) including a portion corresponding to the wearer's gluteal cleft and extending in the front-rear direction. The posterior 1 st region B may be referred to as a region covering the entire gluteal groove, or may be referred to as a region from the posterior of the perineum or the vicinity of the anus to the vicinity of the lower end of the coccyx. The rear 2 nd region C may be substantially from a position where the gluteal cleft ends to the rear end of the main body 8. A region in front of the central region a may be referred to as a front region F.

As described above, when the body 8 receives forces from both legs during wearing, the region between the front and rear direction pressing grooves 10, 10 is generally raised high from the front and rear direction pressing grooves 10, 10. Such a high rise between the front-rear direction compressed grooves 10, 10 is suitable for a groove in a narrow and deep crotch portion.

On the other hand, the gluteal groove has a shape wider and shallower than the groove in the crotch portion. Therefore, if the rise between the front-rear direction pressing grooves 10, 10 is steep, the main body 8 may not fit well in the gluteal groove.

In an example of the present invention in view of this point, the pair of front-rear direction pressing grooves 10, 10 includes: rear 1 st compressed grooves 10B, 10B formed in a region B corresponding to the wearer's gluteal cleft when worn; and central pressing grooves 10a, 10a formed in front of the rear 1 st pressing grooves 10b, 10 b. The sum Sb of the areas per unit length in the front-rear direction of the high-pressure portions 11 of the rear 1 st pressing grooves 10b, 10b is smaller than the sum Sa of the areas per unit length in the front-rear direction of the high-pressure portions 11 of the central pressing grooves 10a, 10a (Sb < Sa).

Here, the "sum of the areas of the high-compressed portions per unit length in the front-rear direction" refers to the sum of the areas of all the high-compressed portions 11 included in a range sandwiched by 2 virtual lines extending in the width direction, which are separated by a predetermined interval, when the main body 8 is cut. For example, the sum of the areas of the high compressed parts included in the range sandwiched by 2 virtual lines separated by 3cm in the front-rear direction can be obtained for each compressed groove (the central compressed grooves 10a, and the rear 1 st compressed grooves 10b, 10b) and compared. In addition, comparison may be made between the left half and the right half of the front-rear direction center line CL.

Since the high squeezing portion 11 is a portion strongly and deeply squeezed by the above-described pressure roller or the like, the smaller the area of the high squeezing portion 11 per unit length, the smaller the rigidity of the squeezing groove. Accordingly, the rigidity of the rear 1 st compressed groove 10b, 10b is lower than the rigidity of the central compressed groove 10a, and as a result, the rigidity of the peripheral region of the rear 1 st compressed groove 10b, 10b is also lower. This can keep the rear 1 st region B soft and avoid the body 8 from being bent steeply from the rear 1 st pressing grooves 10B, 10B. Therefore, the body 8 can be deformed well according to the shape of the hip cleft which is wider and shallower than the groove of the crotch portion.

The ratio (Sb/Sa) of the sum Sb of the areas per unit length in the front-rear direction of the high-pressure extruded portions 11 of the rear 1 st extruded groove 10b, 10b to the sum Sa of the areas per unit length in the front-rear direction of the high-pressure extruded portions 11 of the central extruded groove 10a, 10a is preferably 0.2 to 0.6, more preferably 0.32 to 0.52.

The operational effects of the configuration of the pressing groove of this example will be described in more detail with reference to fig. 3A and 3B. Fig. 3A is a cross-sectional view showing a contact state of the buttocks 70 and the main body 8 when the absorbent article 1 of fig. 1 is worn. Fig. 3B is a cross-sectional view showing a state in which the cleft 70 is in contact with the main body 8' of the conventional absorbent article.

In fig. 3B, the pressing grooves 10B ', 10B ' provided in the rear 1 st region B of the conventional absorbent article main body 8 ' have the same configuration as the central pressing groove in the front thereof, and have the same rigidity. Therefore, there is a tendency that: the body 8 'is easily bent steeply starting from the pressing grooves 10 b', and the region between the pressing grooves 10b ', 10 b' is protruded and raised. Thus, the body 8 'does not fit well to the shape of the wide groove 70 of the buttocks, and a gap is easily formed between the buttocks and the body 8', and leakage of body fluid may occur due to the gap.

In this example, the rear 1 st compressed grooves 10B, 10B provided in the rear 1 st region B of the absorbent article main body 8 have a different configuration from the central compressed grooves 10a, 10a provided in front thereof (fig. 1). Specifically, since the sum Sb of the areas of the high compressed parts 11 of the rear 1 st compressed grooves 10b, 10b per unit length in the front-rear direction is smaller than the sum Sa of the areas of the high compressed parts 11 of the central compressed grooves 10a, 10a per unit length in the front-rear direction, the rigidity of the rear 1 st compressed grooves 10b, 10b is smaller than the rigidity of the central compressed grooves 10a, 10 a. Therefore, the rear 1 st pressing grooves 10b, 10b are not bent steeply, and the entire flexibility of the main body 8 can be maintained. As a result, as shown in fig. 3A, the main body 8 is gently raised, and the main body 8 can be fitted along the shape of the gluteal cleft 70. This can prevent the body fluid directed rearward from leaking along the gluteal groove 70.

The width between the rear 1 st compressed grooves 10b, 10b is smaller than the width between the central compressed grooves 10a, 10 a. Thus, the rising of the main body 8 in the rear 1 st region B is lower than the central region a, and the rear 1 st region B can be well fitted to the buttocks.

Further, as described above, in the region B corresponding to the cleft of the buttocks, the main body 8 can maintain flexibility, and therefore, even if the width or depth of the cleft of the buttocks changes depending on the state of the body, the main body 8 can be deformed following the change. Further, since the central compressed grooves 10a and the rear 1 st compressed grooves 10b and 10b are connected together, the fit to the wearer at the transition from the crotch portion to the gluteal fold is also good. Therefore, the absorbent article 1 of the present embodiment can satisfactorily prevent leakage in the rearward direction even in long-term use or use at bedtime, and therefore can be suitably used as a sanitary napkin for long-term use or night use.

In the example of fig. 1, as described above, the pair of forward and backward pressing grooves 10 and 10 includes the rear 2 nd pressing groove 10c and 10c in addition to the center pressing grooves 10a and the rear 1 st pressing grooves 10b and 10 b. Further, the sum Sc of the areas per unit length in the front-rear direction of the high-pressure portions of the rear 2 nd pressing grooves 10c, 10c can be made larger than the sum Sb of the areas per unit length in the front-rear direction of the high-pressure portions of the rear 1 st pressing grooves 10b, 10b (Sc > Sb). This makes it possible to make the rigidity of the rear 2 nd squeezing grooves 10c, 10c near the rear end portion greater than the rigidity of the rear 1 st squeezing grooves 10b, 10 b. Thus, the above-described effects can be maintained: the rigidity of the rear 1 st region (cleft-corresponding region) B is reduced to keep the main body soft, so that the main body can be favorably changed according to the shape of the cleft of buttocks, and twisting or wrinkles of the rear 2 nd region C assigned to a portion where the cleft of buttocks is small or not can be prevented.

The ratio (Sc/Sb) of the sum Sc of the areas per unit length in the front-rear direction of the high-extrusion portions of the rear 2 nd extrusion grooves 10c, 10c to the sum Sb of the areas per unit length in the front-rear direction of the high-extrusion portions of the rear 1 st extrusion grooves 10b, 10b is preferably 1 to 4.5, more preferably 1.5 to 3.5.

The sum Sc of the areas of the high compressed portions of the rear 2 nd compressed groove 10c, 10c per unit length in the front-rear direction may be the same as or different from the sum Sa of the areas of the high compressed portions of the center compressed groove 10a, 10a per unit length in the front-rear direction.

In the illustrated example, the rear 2 nd squeezing grooves 10c and 10c are curved inward in the width direction as going rearward, and the squeezing groove width is reduced, and the rear 2 nd squeezing grooves 10c and 10c are connected at the rear ends. However, the shape of the rear 2 nd extrusion grooves 10c, 10c in plan view is not limited to the shape shown in the drawings, and the extrusion grooves may not be connected to each other.

Fig. 4A to 4C are enlarged views of portions I, II, and III in fig. 1, that is, partial enlarged views of the central pressing grooves 10a and 10a, the rear 1 st pressing grooves 10b and 10b, and the rear 2 nd pressing grooves 10C and 10C, respectively. As shown in the drawing, each pressing groove includes a high pressing portion 11 and a low pressing portion 12.

Further, as shown in fig. 4A and 4B, the groove width w of the rear 1 st pressing groove 10B is preferably set_bA groove width w larger than that of the central pressing groove 10a_aSmall (w)_b＜w_a). This can further reduce the rigidity of the rear 1 st pressing groove 10b, and can improve the operational effect: the main body 8 is kept soft in the rear 1 st area B.

Groove width w of rear 1 st extrusion groove 10b_bPreferably 0.5 to 3.0mm, and preferably 1 to 2 mm. Groove width w of central pressing groove 10a_aPreferably 1.0 to 3.5mm, more preferably 1.5 to 2.5 mm. In addition, w is as defined above_bAnd w_aRatio (w)_b/w_a) Preferably 0.60 to 0.9, more preferably 0.65 to 0.85.

Further, as shown in the figure, it is preferable that the pitch (pitch) p of the high pressure portions 11 of the rear 1 st pressure groove 10b is set to be equal to or smaller than the pitch p_bPitch p of high-pressure portions 11 larger than central pressure groove 10a_a(p_b＞p_a). Accordingly, the area of the low squeezing portion 12 in the rear 1 st squeezing groove 10B is increased, and therefore, the rigidity of the rear 1 st region B can be reduced, and the operational effect as described above can be further improved: the main body 8 is kept soft in the rear 1 st area B.

Pitch p of high-pressure portions 11 of rear 1 st pressure groove 10b_bPreferably 4 to 10mm, and more preferably 6 to 8 mm. Pitch p of high-pressure portions 11 of central pressure groove 10a_aPreferably 2.5 to 6mm, and more preferably 3.4 to 4.4 mm. In addition, p is as defined above_bAnd p_aRatio (p) of_b/p_a) Preferably 1.2 to 2.8, and more preferably 1.3 to 2.3.

In addition, it is preferable that the interval (distance) d between the high pressing portions 11 of the rear 1 st pressing groove 10b is_bAlso larger than the interval d between the high-pressure portions 11 of the central pressure groove 10a_a(d_b＞d_a). Interval d between high-pressure portions 11 of rear 1 st pressing groove 10b_bPreferably 2.5 to 7mm, more preferably 3.5 to 6.5 mm. In addition, the interval d between the high-pressure parts 11 of the central pressure groove 10a_aPreferably 0.5 to 3mm, more preferably 1.2 to 2.3 mm.

Preferably, as shown in the figure, the groove width w of the rear 2 nd extrusion groove 10c_cIs larger than the groove width w of the rear 1 st extrusion groove 10b_b(w_c＞w_b). This makes it possible to make the rigidity of the rear 2 nd region C higher than the rigidity of the rear 1 st region B. Thus, the above-described effects can be maintained: the rigidity of the rear 1 st region B is reduced and the main body 8 is kept soft, so that the main body can be favorably changed in accordance with the shape of the cleft of the buttocks, and twisting or wrinkling of the rear 2 nd region C near the rear end can be prevented.

Groove width w of rear 2 nd extrusion groove 10c_cPreferably 1.0 to 3.5mm, more preferably 1.5 to 2.5 mm. In addition, w is as defined above_cAnd w_bRatio (w)_c/w_b) Preferably 1.1 to 1.5, and more preferably 1.2 to 1.4. Groove width w of rear 2 nd extrusion groove 10c_cA groove width w which can be matched with the central pressing groove 10a_aThe same is true.

Further, it is preferable that the pitch p of the high pressing portions 11 of the rear 2 nd pressing groove 10c is set to be equal to or smaller than the pitch p of the high pressing portions 11_cPitch p of high-pressure extrusion part 11 smaller than rear 1 st extrusion groove 10b_b(p_c＜p_b). This makes it possible to make the rigidity of the rear 2 nd region C higher than the rigidity of the rear 1 st region B. Thus, such an upper part can be maintainedThe effects are as follows: the rigidity of the rear 1 st region B is reduced and the main body 8 is kept soft, so that the main body can be favorably changed in accordance with the shape of the cleft of the buttocks, and twisting or wrinkling of the rear 2 nd region C near the rear end can be prevented.

Pitch p of high-pressure portions 11 of rear 2 nd pressure groove 10c_cPreferably 3.5 to 7.5mm, more preferably 4.5 to 6.5 mm. In addition, p is as defined above_cAnd p_bRatio (p) of_c/p_b) Preferably 0.5 to 0.9, more preferably 0.68 to 0.88. Pitch p of high-pressure portions 11 of rear 2 nd pressure groove 10c_cA distance p from the high extrusion part 11 of the central extrusion groove 10a_aThe same is true.

In addition, it is preferable that the interval d between the high pressing portions 11 of the rear 2 nd pressing groove 10c is set to be shorter than the interval d between the high pressing portions 11_cThe interval d between the high-pressure extrusion parts 11 is smaller than the rear 1 st extrusion groove 10b_b(d_c＜d_b). Interval d between high-pressure portions 11 of rear 2 nd pressing groove 10c_cPreferably 2.5 to 5mm, and more preferably 3 to 4.5 mm.

And the groove width w_a、w_bAnd w_cMay be fixed or variable throughout the extrusion groove. In addition, the pitch p_a、p_bAnd p_cAnd interval d_a、d_bAnd d_cThe pressure vessel may be fixed or variable throughout the extrusion groove. When the above-described values vary over the extrusion grooves, the average value in each extrusion groove can be used for each value.

In the illustrated example, each high-pressure portion is formed in the forward/rearward direction pressing grooves 10 and 10 so as to contact one of the edges of the pressing groove, and the high-pressure portions contacting one edge of the pressing groove and the high-pressure portions contacting the other edge of the pressing groove are alternately arranged in a staggered manner. The staggered arrangement is preferable because the high-pressure portions can be easily and reliably formed during production. However, the arrangement of the high-squeezing portion is not limited to the illustrated case, and may be: the high-pressure extrusion portions are formed so as to contact both edges of the extrusion groove and are arranged at predetermined intervals.

The shape of the high-compressed portion is semicircular in the front-rear direction compressed grooves 10, 10 in fig. 1, but may be a polygon such as a circle, an ellipse, or a quadrangle. In either case, each high-pressure portion may be formed so as to contact both edges of the pressing groove, or may be formed so as to contact one of both edges of the pressing groove. For example, as in the front pressing groove 20 described later: the high extrusion part is formed in a circular shape and is formed to be in contact with both edges of the extrusion groove. Further, the high-pressure extrusion portion may be disposed so as not to contact both edges of the extrusion groove.

As shown in fig. 1, a front pressing groove 20 may be included in the pressing groove. By providing the front pressing groove 20, the front region can be easily curved in accordance with the curve of the body, and leakage from the front can be prevented.

The shape of the front pressing groove 20 is also not particularly limited. However, if the shape includes a V-shape like the heart shape of the illustrated example, the end of the V-shape is a starting point and the region in front can be bent, which is preferable.

Another example of an absorbent article 501 is shown in fig. 5. As in the example of fig. 1, the absorbent article 501 includes a main body 508, and is formed with a pressing groove recessed from the front sheet 503 side toward the back sheet side. The pressing grooves include front and rear pressing grooves 510, and the front and rear pressing grooves 510, 510 include center pressing grooves 510a, 510a and rear 1 st pressing grooves 510b, 510 b. However, the front-rear direction pressing grooves 510, 510 do not include the rear 2 nd pressing groove, but instead a rear width direction pressing groove 530 is provided in the rear 2 nd region C, which is different from the absorbent article 1 shown in fig. 1. In addition, the length of the absorbent article 501 is shorter by the amount that the length of the rear 2 nd region C is shorter than the length of the absorbent article 1.

In the example of fig. 5, in a plan view, the sum of the areas of the high pressing portions 511 of the rear 1 st pressing grooves 510b, 510b per unit length in the front-rear direction is also smaller than the sum of the areas of the high pressing portions 511 of the central pressing grooves 510a, 510a per unit length in the front-rear direction. This makes it possible to maintain the fit in the central region a corresponding to the crotch portion of the wearer when worn, and to keep the rear 1 st compressed region B, which is the intergluteal groove corresponding region, soft, thereby improving the fit in the rear 1 st compressed region B to the intergluteal groove.

Also, the rear widthwise pressing groove 530 may have a high pressing portion and a low pressing portion. The width of the rear widthwise pressing grooves 530, the pitch of the high pressing portions, the interval between the high pressing portions, and the like may be the same as or different from the rear 1 st pressing grooves 510b, and may be the same as or different from the center pressing grooves 510a, 510 a.

Hereinafter, preferred embodiments of the present invention will be described.

(attached note 1)

An aspect of note 1 is an absorbent article including a main body having: a liquid-permeable front sheet; a liquid-impermeable back sheet; and an absorber provided between the front sheet and the back sheet, wherein the main body has such an elongated shape that: the main body has a pressing groove recessed from the front surface sheet side to the rear surface sheet side, the pressing groove includes a pair of front-rear direction pressing grooves extending in the front-rear direction, and the front-rear direction pressing grooves include: a high extrusion part; and a low extrusion portion recessed shallower than the high extrusion portion, the forward-backward extrusion groove including: a rear 1 st compressed groove formed in a region corresponding to the wearer's gluteal cleft when worn; and a central pressing groove formed in front of the rear 1 st pressing groove, a sum of areas of the high pressing portions in the rear 1 st pressing groove per unit length in the front-rear direction being smaller than a sum of areas of the high pressing portions in the central pressing groove per unit length in the front-rear direction.

In the aspect of supplementary note 1, the front-rear direction pressing groove includes: a rear 1 st crush groove formed in a region corresponding to a wearer's gluteal groove when worn; and a central pressing groove formed forward of the rear 1 st pressing groove, wherein the sum of the areas of the high pressing portions in the rear 1 st pressing groove is smaller than the sum of the areas of the high pressing portions in the central pressing groove per unit length in the front-rear direction. Therefore, the rigidity of the region corresponding to the cleft of the buttocks (cleft-corresponding region) in which the rear 1 st pressing groove is formed can be made smaller than the rigidity of the central region of the main body in which the central pressing groove is formed. This makes it possible to keep the main body soft in the intergluteal fold corresponding region, and to deform the main body satisfactorily in accordance with the shape of the intergluteal fold. As a result, the absorbent article fits well to the cleft of the buttocks, and therefore, a gap is not formed between the buttocks and the main body, and leakage of body fluid rearward can be prevented.

(attached note 2)

In the mode of supplementary note 2, the groove width of the rear 1 st extrusion groove is smaller than the groove width of the central extrusion groove.

In the embodiment of supplementary note 2, the rigidity imparted by the rear 1 st pressing groove can be reduced by reducing the groove width of the rear pressing groove. This reduces the rigidity of the main body in the region corresponding to the cleft of the buttocks, and improves the effect of deforming the shape of the main body corresponding to the cleft of the buttocks.

(attached note 3)

In the aspect of supplementary note 3, the pitch between the high-pressure portions of the rear 1 st pressing groove is larger than the pitch between the high-pressure portions of the central pressing groove.

In the aspect of supplementary note 3, the rigidity imparted by the rear 1 st compressed groove can be reduced by increasing the pitch between the high compressed portions of the rear 1 st compressed groove. This reduces the rigidity of the main body in the region corresponding to the cleft of the buttocks, and improves the effect of deforming the shape of the main body corresponding to the cleft of the buttocks.

(attached note 4)

In the aspect of supplementary note 4, the front-rear direction pressing groove includes a rear 2 nd pressing groove formed behind the rear 1 st pressing groove, and a sum of areas of high pressing portions of the rear 2 nd pressing groove per unit length in the front-rear direction is larger than a sum of areas of the high pressing portions of the rear 1 st pressing groove per unit length in the front-rear direction.

In the aspect of supplementary note 4, the front-rear direction extrusion groove includes a rear 2 nd extrusion groove behind the rear 1 st extrusion groove, and the sum of the areas of the high extrusion portions of the rear 2 nd extrusion groove is larger than the sum of the areas of the high extrusion portions of the rear 1 st extrusion groove per unit length in the front-rear direction. Therefore, the rigidity of the region from the region corresponding to the cleft of the buttocks to the further rear side, in which the rear 2 nd pressing groove is provided, can be made greater than the rigidity of the region corresponding to the cleft of the buttocks. This can maintain the above-described effects: the rigidity of the region corresponding to the cleft of the buttocks is reduced and the main body is kept soft, so that the main body can be favorably changed according to the shape of the cleft of the buttocks, and the twisting or the wrinkle of the region near the rear end can be prevented.

(attached note 5)

In the embodiment of supplementary note 5, the groove width of the rear 2 nd extrusion groove is larger than the groove width of the rear 1 st extrusion groove.

In the embodiment of supplementary note 5, the rigidity of the region closer to the rear end portion rearward of the gluteal groove corresponding region can be increased by increasing the groove width of the rear 2 nd pressing groove. This makes it possible to prevent twisting or wrinkling in the region behind the intergluteal cleft-corresponding region while maintaining the effect of changing the shape of the main body in accordance with the intergluteal cleft in the intergluteal cleft-corresponding region.

(attached note 6)

In the embodiment of supplementary note 6, the pitch between the high-pressure portions of the rear 2 nd pressing groove is smaller than the pitch between the high-pressure portions of the rear 1 st pressing groove.

In the embodiment of reference 6, the rigidity of the region closer to the rear end portion rearward of the gluteal cleft corresponding region can be increased by decreasing the pitch of the rear 2 nd squeezing groove. This makes it possible to prevent twisting or wrinkling in the region behind the intergluteal cleft-corresponding region while maintaining the effect of changing the shape of the main body in accordance with the intergluteal cleft in the intergluteal cleft-corresponding region.

The priority of Japanese patent application No. 2017-119742, filed in the patent office of Japan, 6/19/2017, to the Japan, is hereby incorporated by reference in its entirety.

Description of the reference symbols

1. 500: an absorbent article;

2: a back sheet;

3. 503: a dough sheet;

4: an absorbent body;

5: wrapping the sheet;

7: a side nonwoven fabric;

8. 508: a main body (absorbent article main body);

10. 510: a fore-and-aft direction extrusion groove;

10a, 510 a: a central extrusion groove;

10b, 510 b: the rear 1 st extrusion groove;

10 c: a rear 2 nd extrusion groove;

11. 511: a high extrusion part;

12. 512: a low extrusion portion;

20: a front extrusion groove;

40: a body fluid discharge port corresponding portion;

70: the gluteal fold;

530: a rear width direction extrusion groove;

CL: a front-rear direction centerline;

a: a central region;

b: rear 1 st region (gluteal fold corresponding region);

c: a rear 2 nd zone;

f: a front area;

w: and (4) a wing.