阅读说明：本技术 吸收性物品 (Absorbent article ) 是由 葭叶惠 于 2019-07-29 设计创作，主要内容包括：针对侧片的接合部,确保充分的接合强度并且抑制肌肤触感的恶化,并且获得良好的穿戴感。在肌肤抵接面侧的两侧部在全长上具备左右一对侧片(7)。侧片(7)的宽度方向内侧在宽度方向上折返而层叠多层,并且在该侧片(7)的层叠部分(8)形成有将最下层的侧片(7)与正面片(3)接合的下层侧压花部(9)及使所述层叠部分(8)的侧片(7)从肌肤抵接面侧一体地凹陷而成的肌肤侧压花部(10)。所述下层侧压花部(9)和所述肌肤侧压花部(10)由不同的平面图案形成。(With respect to the joining portion of the side sheet, sufficient joining strength is ensured and deterioration in skin feel is suppressed, and good wearing feeling is obtained. A pair of left and right side sheets (7) are provided on both sides of the skin contact surface side over the entire length. The inner side of the side sheet (7) in the width direction is folded back in the width direction to be laminated in multiple layers, and a lower-layer embossed portion (9) for joining the side sheet (7) at the lowermost layer to the front sheet (3) and a skin-side embossed portion (10) for integrally recessing the side sheet (7) of the laminated portion (8) from the skin contact surface side are formed in the laminated portion (8) of the side sheet (7). The lower layer side embossed portion (9) and the skin side embossed portion (10) are formed of different plane patterns.)

1. An absorbent article having an absorbent body provided between a front sheet and a back sheet and a pair of left and right side sheets provided on both side portions of a skin contact surface side over the entire length thereof, wherein the absorbent article is characterized in that,

the inner side in the width direction of the side sheet is folded back in the width direction to be laminated in a plurality of layers, and a lower-layer-side embossed portion for joining the lowermost side sheet to the front sheet and a skin-side embossed portion for integrally recessing the side sheet of the laminated portion from the skin contact surface side are formed in the laminated portion of the side sheet.

2. The absorbent article of claim 1,

the lower layer side embossed portion and the skin side embossed portion are formed of different plane patterns.

3. The absorbent article according to claim 1 or 2, wherein,

the skin-side embossed portion is formed to have a smaller area per unit area than the lower-layer embossed portion.

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

the lower-layer embossed portion is formed in an intermittent planar pattern in which compressed portions and non-compressed portions are alternately arranged along the longitudinal direction of the absorbent article.

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

the lower layer side embossed portion and the skin side embossed portion are formed in an area overlapping in a thickness direction.

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

the lower-layer-side embossed portion is formed in an area on the inner side in the width direction, and the skin-side embossed portion is formed in an area on the outer side in the width direction, so that the lower-layer-side embossed portion and the skin-side embossed portion are formed in areas that do not overlap in the thickness direction.

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

the side sheet is arranged to extend inward in the width direction with one side portion substantially aligned with the side portion of the top sheet, and to be folded back toward the skin contact surface side with the lower-layer embossed portion as a base end, and the other side portion extends up to the side portion of the absorbent article.

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

an elastic stretchable member is disposed along the longitudinal direction of the absorbent article between the layers of the laminated side sheets, and the elastic stretchable member is disposed on the inner side in the width direction than the lower layer-side embossed portion and the skin-side embossed portion.

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

the lower-layer embossed portion is formed in a cross-sectional shape bulging toward the skin contact surface side.

Technical Field

The present invention relates to an absorbent article used for an incontinence pad, a panty liner, a sanitary napkin, and the like, and more particularly to an absorbent article having a pair of left and right side sheets on both sides of a skin contact surface side.

Background

Conventionally, as such an absorbent article, there is known an article in which an absorbent body made of paper wadding such as ground pulp is provided between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet laminated with a nonwoven fabric and a front sheet, and a pair of left and right side sheets are provided on both side portions of a skin contact surface side over the entire length thereof.

The side sheet is disposed on the skin contact surface side of the absorbent article, has an overlapping amount with the front sheet in the thickness direction on the inner side in the width direction, and is joined to the front sheet at the overlapping portion by a joining portion formed in various manners. As the above bonding, for example, patent document 1 below discloses: the embossed portion has a plurality of compressed portions formed along the side sheet, and the embossed portion has: a 1 st embossed portion formed on the front edge side and the rear edge side, which are the end portions in the longitudinal direction of the absorbent article; and a 2 nd embossed portion formed at a central portion in the longitudinal direction, the 1 st embossed portion being wider than the 2 nd embossed portion in a width direction orthogonal to the longitudinal direction, and compressed portions constituting the 2 nd embossed portion being formed separately from each other, respectively.

Patent document 2 discloses: a leakage preventing part formed by the side sheet comprises a central area and a pair of end areas positioned at the outer side of the central area in the length direction, wherein the end areas are provided with a jointing treatment part for jointing the parts facing each other of the side sheet; and a non-bonding processing portion to which the bonding processing is not applied.

Patent document 3 discloses: the cover sheet is disposed so that the compressed portion is compressed and joined to the front sheet on the skin surface side thereof at a position where the widthwise inner end of the side sheet overlaps with the widthwise side region of the absorber, and the compressed portion is covered from the skin surface side sheet so as to be less visible from the skin surface side of the front sheet.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2008-289535

Patent document 2: japanese patent laid-open publication No. 2010-264161

Patent document 3: japanese patent laid-open publication No. 2017-104436

Disclosure of Invention

Problems to be solved by the invention

However, the structures described in patent documents 1 and 2 are pointed out as follows: since the joint portion joining the side sheet and the front sheet is formed of the embossed portion pressed from the skin contact surface side of the side sheet, if the area of the embossed portion is increased to increase the joint strength, the skin feel is deteriorated, and if the area of the embossed portion is decreased to prevent the skin feel from being deteriorated, the joint strength is decreased and peeling is easily caused.

On the other hand, in the structure described in patent document 3, a compression portion that is compressed and joined to the top sheet is provided at the inner end portion in the width direction of the side sheet, and a cover sheet that covers the compression portion is connected to the side sheet only via an adhesive layer. However, the adhesive layer is liable to peel off because of its reduced adhesiveness under low temperature conditions such as in winter. When the adhesive layer is peeled off, the laminated portion of the side sheet is likely to be distorted or wrinkled, which may deteriorate the wearing feeling. In addition, in the case of using an adhesive layer as a method of bonding a sheet in contact with the skin surface, if the basis weight of the adhesive is increased in order to increase the bonding strength, the adhesive permeates into the sheet and floats on the skin surface side, which causes a blocking feeling, and deteriorates the wearing feeling.

Accordingly, a main object of the present invention is to provide an absorbent article that provides a good wearing feeling while ensuring sufficient joining strength to the joining portions of the side sheets and suppressing deterioration in the tactile sensation of the skin.

Means for solving the problems

In order to solve the above-mentioned problems, the present invention according to claim 1 provides an absorbent article comprising an absorbent body provided between a front sheet and a back sheet and a pair of left and right side sheets provided on both side portions on a skin contact surface side over the entire length thereof, wherein the absorbent article is characterized in that,

the inner side in the width direction of the side sheet is folded back in the width direction to be laminated in a plurality of layers, and a lower-layer-side embossed portion for joining the lowermost side sheet to the front sheet and a skin-side embossed portion for integrally recessing the side sheet of the laminated portion from the skin contact surface side are formed in the laminated portion of the side sheet.

In the invention described in claim 1, the inner side in the width direction of the side sheet overlapped with the front sheet is folded back in the width direction and stacked in a plurality of layers to form the stacked portion of the side sheet. The side sheet lamination portion is formed with a lower-layer embossed portion for joining the lowermost side sheet and the front sheet, and a skin-side embossed portion in which the side sheet of the lamination portion is integrally recessed from the skin contact surface side. In this way, the laminated portion of the side sheet is laminated on the skin contact surface side of the lower-layer embossed portion, so that the laminated portion does not directly contact the skin surface, and deterioration in the tactile sensation of the skin can be suppressed even when the laminated portion is formed in a large area having sufficient bonding strength. On the other hand, the skin-side embossed portion formed on the skin contact surface side of the laminated portion of the side sheet may be formed with a joining strength to such an extent that the side sheets can be prevented from being peeled off from each other in the laminated portion, and a feeling of discomfort does not occur even if the side sheets are directly contacted with the skin surface. Therefore, a good wearing feeling is obtained.

The present invention according to claim 2 provides the absorbent article according to claim 1, wherein the lower-layer-side embossed portions and the skin-side embossed portions are formed of different planar patterns.

In the invention recited in claim 2, the lower-layer-side embossed portion and the skin-side embossed portion are formed in different planar patterns so that the lower-layer-side embossed portion is formed in a planar pattern in which the bonding strength to the topsheet is emphasized, and the skin-side embossed portion is formed in a planar pattern in which the appearance viewed from the skin-contacting surface side of the absorbent article is emphasized to improve the decorativeness.

The present invention according to claim 3 provides the absorbent article according to any one of claims 1 and 2, wherein the skin-side embossed portion is formed so as to have a smaller area per unit area than the lower-layer embossed portion.

In the invention according to claim 3, since the skin-side embossed portion is formed in a smaller area than the lower-layer embossed portion because the bad feeling of contact with the skin when the skin-side embossed portion contacts the skin surface is reduced and the bonding strength with the topsheet by the lower-layer embossed portion is increased.

The invention according to claim 4 provides the absorbent article according to any one of claims 1 to 3, wherein the lower-layer-side embossed portions are formed in an intermittent planar pattern in which compressed portions and non-compressed portions are alternately arranged in the longitudinal direction of the absorbent article.

In the invention according to claim 4, the planar pattern of the lower-side embossed portions is an intermittent pattern in which the compressed portions and the non-compressed portions are alternately arranged along the longitudinal direction of the absorbent article, so that the pressure during compression is dispersed, and the bonding strength between the side sheet and the front sheet is improved.

The present invention according to claim 5 provides the absorbent article according to any one of claims 1 to 4, wherein the lower-layer-side embossed portions and the skin-side embossed portions are formed in a region overlapping in the thickness direction.

The invention described in claim 5 is an example 1 showing the relative positional relationship between the lower-layer embossed portion and the skin-side embossed portion, and the lower-layer embossed portion and the skin-side embossed portion are formed in an area overlapping in the thickness direction. Thus, the lower-layer embossed portion can be formed over a wide range of the laminated portion of the side sheet, and the joining strength of the side sheet and the front sheet can be more reliably increased.

The present invention according to claim 6 provides the absorbent article according to any one of claims 1 to 4, wherein the lower-layer-side embossed portions are formed in regions on the inner side in the width direction, and the skin-side embossed portions are formed in regions on the outer side in the width direction, so that the lower-layer-side embossed portions and the skin-side embossed portions are formed in regions that do not overlap in the thickness direction.

The invention described in claim 6 is an example of the 2 nd aspect showing the relative positional relationship between the lower-layer-side embossed portion and the skin-side embossed portion, and the lower-layer-side embossed portion and the skin-side embossed portion are formed in regions that do not overlap in the thickness direction. By forming the lower-layer-side embossed portions in the region on the inner side in the width direction, the folded-back base ends when the lower-layer-side embossed portions are to be the folded-back base ends when the side sheets are folded back, and the side sheets are easily folded back, and by forming the skin-side embossed portions in the region on the outer side in the width direction, the skin-side embossed portions are not formed on the inner side in the width direction, which is easily in contact with the skin surface, and therefore, the skin-side embossed portions can be made less likely to be in contact with the skin surface, and the skin contact feeling can be further softened.

The present invention according to claim 7 provides the absorbent article according to any one of claims 1 to 6, wherein the side sheet is disposed so as to extend inward in the width direction with one side portion substantially aligned with the side portion of the front sheet, and is folded back toward the skin contact surface side with the lower-layer embossed portion as a base end, and the other side portion extends up to the side portion of the absorbent article.

The invention described in claim 7 is a preferable laminated state of the laminated portion of the side sheet, and has a double-layer structure folded back inward in the width direction. In this way, by folding back the side sheet inward in the width direction toward the skin contact surface side and extending the folded-back side portion to the side portion of the absorbent article, the side portion of the side sheet can be prevented from coming into contact with the skin surface, and the skin feel can be further improved.

The present invention according to claim 8 provides the absorbent article according to any one of claims 1 to 7, wherein an elastic member is disposed along a longitudinal direction of the absorbent article between the layers of the laminated side sheets, and the elastic member is disposed on an inner side in a width direction than the lower-layer-side embossed portions and the skin-side embossed portions.

In the invention according to claim 8, since the elastically stretchable member is disposed between the layers of the side sheet and the elastically stretchable member is disposed on the inner side in the width direction than the lower-layer-side embossed portion and the skin-side embossed portion, the embossed portion is not restricted by the contraction force, and the function of the elastically stretchable member can be exhibited.

The invention according to claim 9 provides the absorbent article according to any one of claims 1 to 8, wherein the lower-layer embossed portion is formed in a sectional shape bulging toward the skin contact surface side.

In the invention according to claim 9, the lower-layer embossed portion is formed in a cross-sectional shape bulging toward the skin contact surface side, whereby the cushioning property of the laminated portion of the side sheet is improved, and the skin contact feeling of the portion can be further softened.

Effects of the invention

As described above in detail, according to the present invention, it is possible to obtain a good wearing feeling while suppressing deterioration in the tactile sensation of the skin while securing sufficient bonding strength to the bonded portion of the side sheet.

Drawings

Fig. 1 is a partially cut-away developed view of a sanitary napkin 1 according to the present invention.

Fig. 2 is a line-up view II-II of fig. 1.

Fig. 3 is an enlarged plan view of the laminated portion 8 of the side sheet 7.

Fig. 4 is an IV-IV line view of fig. 3.

Fig. 5 is a plan view showing the lower embossing part 9.

Fig. 6 is a plan view showing a modification of the lower embossing unit 9.

Fig. 7 is a plan view showing a modification of the skin-side embossed portion 10.

Fig. 8 is an enlarged plan view showing a laminated portion 8 of the side sheet 7 according to a modification.

Fig. 9 is an in-line view IX-IX of fig. 8.

Fig. 10 is a development view of a sanitary napkin 1 according to a modification.

Fig. 11 is a line drawing XI-XI of fig. 10.

Fig. 12 is a perspective view showing a processing step of the embossed portion.

Fig. 13 is a cross-sectional view showing another embodiment of the front sheet 3 and the side sheet 7.

Detailed Description

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

[ an example of the basic structure of a sanitary napkin for physiological use ]

As shown in fig. 1 and 2, the sanitary napkin 1 of the present invention is mainly composed of: a liquid-impermeable back sheet 2 made of a polyethylene sheet or the like; a front sheet 3 serving as a skin contact surface through which body fluid rapidly passes; an absorber 4 interposed between the two sheets 2 and 3 and made of cotton-like pulp or synthetic pulp; a cover sheet 5 made of crepe paper, nonwoven fabric, or the like, covering at least the skin-side surface and the non-skin-side surface of the absorbent body 4 to improve shape retention and diffusion of the absorbent body 4; and a pair of left and right side sheets 7 provided substantially over the entire length of the sanitary napkin 1 on both sides of the skin-contacting surface. The outer edge portions of the back sheet 2 and the front sheet 3 are joined to each other at the upper and lower edge portions of the periphery of the absorbent body 4 by an adhesive such as a hot melt adhesive, heat sealing, ultrasonic sealing, or the like, and the back sheet 2 and the side sheets 7 extending laterally from the absorbent body 4 are joined to each other at the both edge portions thereof by an adhesive such as a hot melt adhesive, heat sealing, ultrasonic sealing, or the like. In the illustrated example, the absorbent body 4 has a single-layer structure, but may have a multi-layer structure in which a middle-height portion is formed, or may have a multi-layer structure in which absorbent bodies having the same size and shape are stacked. If necessary, a hydrophilic second sheet may be provided between the top sheet 3 and the absorbent body 4.

The back sheet 2 is a sheet having at least water-barrier properties such as polyethylene, but in recent years, a material having moisture permeability tends to be used from the viewpoint of prevention of stuffiness. As the water-barrier/moisture-permeable sheet, a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, molding the sheet, and then stretching the sheet in a uniaxial or biaxial direction is suitably used. One or more adhesive layers (not shown) are formed on the non-skin contact surface side (outer surface) of the back sheet 2, and the sanitary napkin 1 is fixed to underwear when worn on the body. As the back sheet 2, a polyethylene laminated nonwoven fabric obtained by laminating a plastic film and a nonwoven fabric may be used.

Next, a porous or nonporous nonwoven fabric, a porous plastic sheet, or the like is suitably used for the front sheet 3. As the material fiber constituting the nonwoven fabric, in addition to synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, polyamides, rayon, regenerated fibers such as cuprammonium fibers, and natural fibers such as cotton, nonwoven fabrics obtained by a suitable processing method such as spunlace, spunbond, thermal bond, melt blown, needle punch, and the like can be used. Among these processing methods, the spunlace method has an advantage of good flexibility and drapability, and the thermal bonding method has an advantage of bulkiness and high compression elasticity. When the front sheet 3 has many through holes, body fluid is quickly absorbed, and the dryness is excellent. The fibers of the nonwoven fabric may be either long fibers or short fibers, but it is preferable to use short fibers to give the feel of a terry cloth. In addition, in order to facilitate the embossing treatment, it is preferable to use an olefin-based fiber having a relatively low melting point, such as polyethylene or polypropylene. Further, a core-sheath fiber, a side-by-side fiber, or a composite fiber of a split fiber, 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, can also be preferably used.

The absorbent body 4 can absorb and retain body fluid and can be configured by dispersing and mixing powdery superabsorbent polymer in powdery pulp fibers, or by providing a polymer sheet of superabsorbent polymer between an upper sheet on the skin contact surface side and a lower sheet on the non-skin contact surface side.

Examples of the pulp fibers include chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and pulp composed of artificial cellulose fibers such as rayon and acetate, and softwood pulp having a longer fiber length is preferably used as compared with hardwood pulp in terms of function and price. The weight per unit area of the pulp fiber is 150-700 g/m²Preferably 250 to 400g/m²The weight per unit area of the super absorbent polymer is 15 to 470g/m²Preferably 15 to 100g/m²。

Examples of the super absorbent polymer include a polyacrylate crosslinked product, a self-crosslinked polyacrylate, a saponified product of an acrylate-vinyl acetate copolymer crosslinked product, an isobutylene/maleic anhydride copolymer crosslinked product, a polysulfone crosslinked product, and a material obtained by partially crosslinking a water-swellable polymer such as polyethylene oxide or polyacrylamide. Among these, acrylic acid or acrylate-based materials having excellent water absorption capacity and water absorption speed are preferable. In the production process, the high water-absorbent polymer having the water-absorbing property can adjust the absorption capacity (water-absorbing power) and the absorption rate by adjusting the crosslink density and the crosslink density gradient.

[ side sheet ]

In the illustrated example, the front sheet 3 has a width slightly larger than the width of the absorbent member 4, and only covers the absorbent member 4, and the widthwise outer side of the front sheet 3 is covered with side sheets 7 (members different from the front sheet 3) extending from the skin contact surfaces of both side portions of the front sheet 3. The side sheet 7 may be a nonwoven material subjected to a suitable hydrophobic treatment or hydrophilic treatment for the purpose of preventing penetration of body fluid or improving the touch of the skin. As such a side sheet 7, a material formed by using natural fibers, synthetic fibers, regenerated fibers or the like as a material and by an appropriate processing method can be used, but a nonwoven fabric having a reduced square meter weight and maintained air permeability is preferable in order to remove a stiff feeling and prevent stuffiness. Specifically, the weight of the square meter is preferably 8 to 23g/m²And the nonwoven fabric is produced.

As shown in fig. 2, the side sheet 7 is disposed in a region extending from a predetermined inner position overlapping the absorbent body 4 in the thickness direction to the outer edge of the back sheet 2 over the side edge of the absorbent body at a portion outside the intermediate portion in the width direction of the sanitary napkin 1. By the laminated sheet portions of the side sheet 7 and the back sheet 2, wing portions not provided with the absorbent member 4 are formed on both side portions of the absorbent member 4. As shown in fig. 1, the wing portions are formed as a pair of right and left wing-like flaps W, W at the side portions of the region substantially corresponding to the bodily fluid discharge portion H of the wearer. The outer surface side of the wing-like flaps W, W has an adhesive layer (not shown), and when the panty is worn, the wing-like flaps W, W are folded back to the non-skin-contacting surface side along the fold line RL at the proximal end and are wound and fixed around the crotch of the panty.

On the other hand, the width direction inner side of the side sheet 7 forms a laminated portion 8 folded back in the width direction and laminated in multiple layers. The laminated portion 8 of the side sheet 7 is formed over the entire length of the side sheet 7 with almost the same width along the longitudinal direction of the sanitary napkin 1, and is formed in a range including a region overlapping with the front sheet 3 in the thickness direction. That is, at least a part of the width direction inner side of the laminated portion 8 overlaps the topsheet 3 by the amount in the thickness direction, preferably the entire laminated portion 8 overlaps the topsheet 3 in the thickness direction, and more preferably the width direction outer edge of the laminated portion 8 substantially coincides with the side edge of the topsheet 3.

As shown in fig. 3 and 4, the laminated portion 8 of the side sheet 7 is formed with a lower-layer embossed portion 9 for joining the lowermost side sheet 7 to the front sheet 3, and a skin-side embossed portion 10 in which the side sheet 7 of the laminated portion 8 is integrally recessed from the skin contact surface side. The lower-layer embossed portion 9 is an embossed portion for a structure for firmly joining the side sheet 7 and the topsheet 3, and the skin-side embossed portion 10 is an embossed portion for preventing the side sheet 7 of the laminated portion 8 from being twisted or wrinkled by integrating the laminated side sheet 7, and has a decorative meaning in which the appearance is good when viewed from the skin contact surface side of the sanitary napkin 1.

The lower-layer embossed portion 9 and the skin-side embossed portion 10 are portions to which fibers are heat-fused by applying heat or ultrasonic waves during pressing. From the viewpoint of softening the skin touch feeling, it is preferable that at least the skin-side embossed portion 10 uses ultrasonic waves as a heat welding method.

In the embodiment example shown in fig. 4, the side sheet 7 is disposed such that one side portion extends inward in the width direction in a state substantially coincident with the side portion of the topsheet 3, and is folded back toward the skin contact surface side with the edge portion on the inner side in the width direction of the lower-layer embossed portion 9 as the base end, and the other side portion extends to the side portion of the sanitary napkin 1. Thus, in the mode example shown in fig. 4, the laminated portion 8 is formed of a double-layer structure.

In this way, in the sanitary napkin 1, the sheet portion to which the lower-layer-side embossed portion 9 is not applied in the laminated portion 8 in which the side sheet 7 is laminated on the skin contact surface side of the lower-layer-side embossed portion 9, so that the lower-layer-side embossed portion 9 does not directly contact the skin when worn, and therefore, even if the lower-layer-side embossed portion 9 is formed in a large area having sufficient bonding strength, deterioration in the tactile sensation of the skin can be suppressed. On the other hand, the skin-side embossed portion 10 formed on the skin contact surface side of the laminated portion 8 may be formed with a bonding strength to such an extent that the side sheets 7 of the laminated portion 8 can be prevented from peeling off from each other, and a feeling of discomfort does not occur even if the laminated portion is in direct contact with the skin surface. Therefore, a good wearing feeling is obtained.

Further, since the skin-side embossed portions 10 prevent the side sheets 7 and 7 of the laminated portion 8 from peeling off from each other, the side sheets 7 of the laminated portion 8 are less likely to be twisted or wrinkled, and the skin-side embossed portions 10 are formed in a wavy planar pattern or a pattern of a pattern such as a chip is added, so that the appearance of the absorbent article as viewed from the skin contact surface side is improved, and the decorativeness can be improved.

As shown in fig. 3, the lower-layer embossed portion 9 and the skin-side embossed portion 10 are preferably formed in different planar patterns. That is, the lower-layer embossed portion 9 is preferably formed of a flat pattern that can firmly join the side sheet 7 and the top sheet 3, and the skin-side embossed portion 10 is preferably formed of a flat pattern that is less likely to deteriorate the skin feel and has excellent decorativeness.

In order to prevent the skin feel from deteriorating when worn, the skin-side embossed portion 10 is preferably formed to have a smaller area per unit area than the lower-layer embossed portion 9. The area of the embossed portion per unit area is a value obtained by dividing the total area of the lower-layer-side embossed portions 9 or the total area of the skin-side embossed portions 10 by the area of the laminated portion 8. By forming the skin-side embossed portion 10 in an area smaller than the lower-side embossed portion 9, it is possible to suppress deterioration in the skin feel while ensuring sufficient bonding strength between the side sheet 7 and the front sheet 3 by the lower-side embossed portion 9. The ratio of the area of the skin-side embossed portion 10 to the area of the lower-layer embossed portion 9 is 1/2 to 1/50, preferably 1/5 to 1/20.

As shown in fig. 5, the lower-layer embossed portion 9 is preferably formed in an intermittent planar pattern in which compressed portions 9a and non-compressed portions 9b are alternately arranged along the longitudinal direction of the sanitary napkin 1. By forming the lower-layer embossed portions 9 in an intermittent pattern, the pressure at the time of pressing the lower-layer embossed portions 9 is dispersed, and therefore the joining strength of the side sheet 7 and the front sheet 3 can be further improved. Even if the side sheet 7 and the top sheet 3 are firmly joined by the lower-layer embossing portion 9, the side sheet is easily bent at the non-compressed portion 9b, and therefore, the sanitary napkin 1 can be flexibly deformed and easily attached to the skin surface.

As shown in fig. 5, one or a plurality of the pressing portions 9a may be disposed in the lower-layer embossed portion 9 with respect to the width direction of the sanitary napkin 1. In the illustrated example, two pressing portions 9a and 9a are arranged in the width direction. As shown in the illustrated example, the joining strength of the side sheet 7 and the front sheet 3 can be further improved by arranging a plurality of sheets in the width direction. When a plurality of the squeezing portions 9a are arranged in the width direction, the squeezing portions 9a adjacent to each other in the length direction and the width direction may be arranged in a regular lattice shape as shown in fig. 5 (a), or in a rhombic lattice shape in which the squeezing portions 9a adjacent to each other in the width direction are shifted by half a pitch in the length direction as shown in fig. 5 (B). In the case of the regular lattice arrangement, the layered portion 8 is easily bent along the roundness of the front and rear of the body, and in the case of the rhombic lattice arrangement, the layered portion 8 is easily deformed in the oblique direction.

As shown in fig. 5, the given width a of the lower embossing 9 is arbitrary as long as it is within the width of the laminated portion 8, but is preferably 3 to 15mm, more preferably 5 to 10 mm.

The planar shape of the pressing portion 9a of the lower-layer embossed portion 9 is an oval shape elongated in the longitudinal direction of the sanitary napkin 1 in the example shown in fig. 5, but may be formed of (a) a circle, (B) a rectangle, (C) a rhombus, or the like as shown in fig. 6.

The lower-layer embossed portion 9 can be formed by pressing from the outer surface side of the front sheet 3 or the outer surface side of the side sheet 7 in a state where the front sheet 3 and the side sheet 7 are stacked. That is, the pressing direction may be in either direction, and may or may not be bulged toward the surface on the opposite side to the pressed surface. As shown in fig. 4, the preferred embodiment is formed in a dome-like cross-sectional shape bulging toward the skin contact surface side. By forming the cross-sectional shape bulging toward the skin contact surface side, the cushioning property of the laminated portion 8 is increased, and the skin contact feeling of the portion can be made softer.

Next, the skin-side embossed portion 10 will be described, and the skin-side embossed portion 10 may be formed continuously along the substantially longitudinal direction of the sanitary napkin 1 as shown in fig. 1 and 3, or may be formed intermittently with the compressed portions and the non-compressed portions alternately arranged as shown in fig. 7 (a) and (C).

As shown in fig. 1, 3, and (a) to (C) of fig. 7, the skin-side embossed portion 10 preferably includes a wavy line that reciprocates in the width direction along the substantially longitudinal direction of the sanitary napkin 1. Since the skin-side embossed portion 10 includes wavy lines, the layered portion 8 is less likely to be hindered from deforming along the body when worn and the decorative appearance is excellent. In order to further improve the decorativeness, as shown in fig. 3 and 7 (a), the pressing portions having specific shapes such as chips, stars, and hearts, or geometric shapes such as circles and polygons may be discretely arranged on the wavy line or in the vicinity of the wavy line. On the other hand, as shown in fig. 7 (D), the skin-side embossed portion 10 may be formed by a straight line including a continuous line or a broken line along the longitudinal direction of the sanitary napkin 1.

In addition, as in the lower-layer embossed portion 9, the skin-side embossed portion 10 is provided with one or a plurality of intermittent patterns intermittently arranged along the longitudinal direction of the sanitary napkin 1 in the width direction of the sanitary napkin 1. In this case, the bonding strength of the skin-side embossed portion 10 is preferably lower than the bonding strength of the lower-layer embossed portion 9. This can soften the skin contact feeling of the skin-side embossed portion 10. The bonding strength can be reduced by either or both of a method of reducing the pressing depth during pressing and a method of reducing the heating temperature.

As shown in fig. 3, the width B of the skin-side embossed portion 10 is preferably smaller than the width a of the lower-layer embossed portion 9, specifically 1 to 10mm, and preferably 1 to 5 mm.

As shown in fig. 3, the lower-layer-side embossed portion 9 and the skin-side embossed portion 10 may be formed in an area overlapping in the thickness direction. That is, the lower-layer-side embossed portion 9 is formed almost entirely on the laminated portion 8, and the skin-side embossed portion 10 is formed in a region overlapping with the lower-layer-side embossed portion 9 in the thickness direction. This enables the lower-stage embossed portion 9 to be formed over a wide range of the laminated portion 8, and therefore, the joining strength of the side sheet 7 and the front sheet 3 can be further improved. In fig. 3, the skin-side embossed portion 10 is formed over substantially the entire width of the laminated portion 8, but the skin-side embossed portion 10 may be disposed only in the width-direction outer region of the laminated portion 8 in order to make the skin-contacting feeling softer, considering that the width-direction inner side of the laminated portion 8 is a region that is easily brought into contact with the skin surface.

As a modification, as shown in fig. 8 and 9, the lower-layer embossed portions 9 and the skin-side embossed portions 10 can be formed in regions that do not overlap in the thickness direction by forming the lower-layer embossed portions 9 in regions on the inner side in the width direction and forming the skin-side embossed portions 10 in regions on the outer side in the width direction. By forming the lower-layer embossed portions 9 in the region on the inner side in the width direction, the side sheet 7 is easily folded back at the folded-back base end of the lower-layer embossed portions 9 when the folded-back side sheet 7 is formed in the manufacturing process, and by forming the skin-side embossed portions 10 in the region on the outer side in the width direction, the skin-side embossed portions 10 are not applied to the region on the inner side in the width direction which is easily in contact with the skin surface, and therefore, the skin-side embossed portions 10 are less likely to be in contact with the skin surface, and the skin contact feeling can be made softer.

When the skin-side embossed portion 10 is formed in the region on the outer side in the width direction, the skin-side embossed portion 10 is preferably arranged on the outer side of the absorbent body 4. Thus, the skin-side embossed portions 10 are disposed at positions recessed from the disposition region of the absorbent body 4 toward the non-skin side by the thickness of the absorbent body 4, and therefore, the chances of the skin-side embossed portions 10 coming into contact with the skin surface are further reduced, and the skin contact feeling can be further softened.

However, as shown in fig. 10 and 11, the sanitary napkin 1 may be easily bent in the longitudinal direction by disposing the elastic stretchable member 11 in an extended state along the longitudinal direction of the sanitary napkin 1 between the layers of the laminated side sheet 7. In this case, the elastically stretchable member 11 is preferably disposed on the inner side in the width direction than the lower-layer embossed portion 9 and the skin-side embossed portion 10. Accordingly, the elastically stretchable members 11 are likely to generate a contractive force, the sanitary napkin 1 is likely to bend in the longitudinal direction, and the inner portions in the width direction of the side sheets 7 on which the elastically stretchable members 11 are disposed are likely to rise toward the skin side, and are likely to function as barriers to bodily fluids flowing laterally on the surface of the front sheet 3, thereby improving the effect of preventing the bodily fluid from leaking laterally. As the elastic and stretchable member 11, a linear rubber is preferably used.

Next, a joining method of joining the front sheet 3 and the side sheet 7 in the method of manufacturing the sanitary napkin 1 will be described. As shown in fig. 12, in a state where the side edges of the front sheet 3 are substantially aligned on the skin contact surface side and the side sheets 7 are stacked, the front sheet 3 and the side sheets 7 are introduced between a convex roller 20 having a plurality of convex portions formed on the circumferential surface thereof corresponding to the lower-layer embossed portions 9 and a concave roller 21 having a plurality of concave portions formed on the circumferential surface thereof corresponding to the convex portions, and the lower-layer embossed portions 9 are added. Next, the side sheet 7 extending inward in the width direction from the lower-stage embossed portion 9 is folded back outward in the width direction with the edge on the inner side in the width direction of the lower-stage embossed portion 9 as a base end, and the skin contact surface side of the lower-stage embossed portion 9 is covered with the folded-back side sheet 7, thereby forming the laminated portion 8 of the side sheet 7. The laminate of the front sheet 3 and the side sheet 7 in this state is introduced between a convex roller 22 having a convex portion formed on the peripheral surface thereof corresponding to the skin-side embossed portion 10 and a flat roller 23 having a flat peripheral surface, and the skin-side embossed portion 10 is formed by integrally pressing the side sheet 7 and the front sheet 3 by pressing from the skin contact surface side of the laminated portion 8 of the side sheet 7. According to the above, the joining of the front sheet 3 and the side sheet 7 is completed.

In the above embodiment, the lower-layer embossing part 9 is formed in such a shape as to integrally bulge the front sheet 3 and the side sheet 7 toward the skin contact surface side or the non-skin contact surface side by passing between the convex roller 20 and the concave roller 21, but the front sheet 3 and the side sheet 7 may be formed in such a shape as to be recessed within the range of the thickness of the laminate by passing between the convex roller and the flat roller and pressing from the non-skin contact surface side of the front sheet 3 or the skin contact surface side of the side sheet 7. In the above embodiment, the skin-side embossed portion 10 passes between the convex roller 22 and the flat roller 23, and the topsheet 3 and the folded-up side sheet 7 are formed in a shape recessed within the range of the thickness of the laminate by pressing from the skin contact surface side of the topsheet 3, but the topsheet 3 and the folded-up side sheet 7 may be formed in a shape integrally bulging toward the non-skin contact surface side by passing between the convex roller and the concave roller.

[ other modes for example ]

In the above embodiment, the laminated portion 8 of the side sheet 7 is formed of two layers, but may be formed of three or more layers. In the case of three or more layers, the lower-layer embossing part 9 may be formed by joining at least the side sheet 7 and the front sheet 3 of the lowermost layer, or may be formed by integrally joining the side sheet 7 and the front sheet 3 of the lowermost layer and the upper layer. That is, the lower-layer embossed portion 9 may not be applied to the uppermost side sheet 7. By forming the laminated portion 8 in three or more layers, the thickness of the laminated portion 8 increases, and the effect of serving as a barrier at both side portions of the front sheet 3 improves.

In the case where the laminated portion 8 is formed of three layers, for example, as shown in fig. 13, the side edge of the side sheet 7 is preferably a folded portion which is not exposed inward in the width direction, thereby preventing the side edge from coming into contact with the skin surface and deteriorating the wearing feeling. In the embodiment example shown in fig. 13, after the lower-layer embossed portion 9 is formed in the middle portion in the width direction of the side sheet 7, the side sheet 7 extending to the outside in the width direction from the lower-layer embossed portion 9 is folded back on the skin contact surface side of the lower-layer embossed portion 9, the side edge of the folded-back side sheet 7 is further involved, and the side sheet 7 extending to the inside in the width direction from the lower-layer embossed portion 9 is folded back on the skin contact surface side, thereby forming the laminated portion 8 having a three-layer structure.

Description of the reference symbols

1 … sanitary napkin; 2 … back sheet; 3 … dough sheet; 4 … absorbent body; 5 … wrapping sheets; 7 … side panel; 8 … laminated part; 9 … lower embossing part; 10 … skin side embossing part; 11 … elastic expansion member