Absorbent article

Abstract

To provide an absorbent article which is easy to wear.SOLUTION: An absorbent article includes: a length along a longitudinal direction corresponding to a back and forth direction of a wearer; a length along a width direction orthogonal to the longitudinal direction; an absorber which is arranged at least in a region corresponding to the crotch of a wearer and absorbing liquid and has absorbent cores absorbing liquid; a water permeable sheet arranged on the skin surface side of the absorber; a pair of leakage preventing wall forming sheets which is arranged on the skin surface side of the water permeable sheet and on both sides in the width direction, forms leakage preventing walls preventing leakage of liquid, in which insides in the width direction are folded to the skin surface side along a folding line extending in the longitudinal direction, and which has fixed parts in which insides in the width direction of the folding lines are connected to the water permeable sheets outside the longitudinal direction, and an elastic member adhered to extend in the longitudinal direction in an extended state to the free end part side of the leakage preventing wall; and a non-adhesive part in which inter-sheet parts laminated between the absorbent cores from the water permeable sheets are non-adhesive inside the fixed parts and the width direction of the fixed parts.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to absorbent articles.

Background Art

[0002] Disposable diapers, absorbent pads, sanitary products, and other absorbent articles have been developed (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Absorbent articles inhibit the movement of exudate and soft feces discharged by the wearer by a leak barrier and suppress side leakage. However, in order to raise the leak barrier, if the shrinkage rate of the leak barrier is increased, the longitudinal ends of the absorbent article may fall toward the longitudinal center side, which may make the wearing operation troublesome.

[0005] An object of the present invention is to provide an absorbent article that is easy to wear.

Means for Solving the Problems

[0006] An absorbent article according to one aspect of the present invention includes a length along a longitudinal direction corresponding to the front-back direction of the wearer, a length along a width direction orthogonal to the longitudinal direction, an absorber having an absorption core that is at least disposed in a region corresponding to the crotch of the wearer and absorbs liquid, a water-permeable sheet disposed on the skin side of the absorber, A pair of leak - proof wall forming sheets are arranged on the skin - side of the water - permeable sheet and on both sides in the width direction to form leak - proof walls for preventing liquid leakage. The inner side in the width direction is folded back to the skin - side along a folding line extending in the longitudinal direction, and a fixing part where the inner side in the width direction is connected to the water - permeable sheet on the outer side in the longitudinal direction and beyond the folding line. And an elastic member adhered to the free - end side of the leak - proof wall so as to extend in the longitudinal direction in an extended state. It includes a non - adhesive part where the sheets laminated between the water - permeable sheet and the absorption core are non - adhesive between the fixing part and the inner side in the width direction of the fixing part.

Advantages of the Invention

[0007] According to the present invention, the wearing operation becomes easy.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0009] Hereinafter, embodiments of the present invention will be described. The embodiments shown below are one aspect of the present invention and do not limit the technical scope of the present invention.

[0010] <Embodiment> In this embodiment, for a disposable absorbent pad (an example of the "absorbent article" referred to in the present application), the direction connecting the front body portion disposed facing the abdomen of the wearer and the back body portion disposed facing the back of the wearer is defined as the longitudinal direction. Between these front body portions (one side in the longitudinal direction) and the back body portions (the other side in the longitudinal direction) (at the center in the longitudinal direction), a crotch portion disposed under the crotch of the wearer (opposite to the crotch) is connected and positioned. Further, in a state where the absorbent pad is worn by the wearer (hereinafter abbreviated as the "worn state"), the side facing the wearer's skin (the inner side in the worn state) is defined as the skin surface side, and the opposite side of the skin surface side (the outer side in the worn state) is defined as the non-skin surface side. Furthermore, the direction connecting the skin surface side and the non-skin surface side is defined as the thickness direction, and the direction orthogonal to both the longitudinal direction and the thickness direction is defined as the width direction. In addition, viewing from the thickness direction is defined as a plan view. The absorbent pad has a length along the longitudinal direction and a length along the width direction orthogonal to the longitudinal direction. Also, the terms related to the directions used in the present application mean the directions that coincide with the front, back, left, and right of the wearer in a state where the absorbent pad is worn by the wearer. For example, when referring to the left-right direction in the present application, it means the direction that coincides with the left and right of the wearer in a state where the absorbent pad is worn by the wearer.

[0011] FIG. 1 is an external perspective view of the absorbent pad 1 according to the embodiment. The absorbent pad 1 is used to absorb and hold liquids such as urine, and can be used alone by being disposed on the skin surface side of the undergarment, or can also be used by being stacked inside a disposable diaper. The absorbent pad 1 has a crotch region 1B corresponding to the crotch covering the genitals of the wearer in the worn state, a front body region 1F located on the front side of the crotch region 1B and corresponding to the front body portion of the wearer, and a back body region 1R located on the back side of the crotch region 1B and corresponding to the back body portion of the wearer.

[0012] In the absorbent pad 1, an absorbent body 6 capable of absorbing and retaining liquid is mainly disposed around the crotch region 1B. In addition, in order to prevent the formation of gaps between the absorbent pad 1 and the wearer's skin that can serve as a liquid outflow path, the absorbent pad 1 is provided with leakage barrier walls 3L, 3R (an example of the "leak barrier" as referred to in this application) around the wearer's crotch region 1B. The leakage barrier walls 3L, 3R are in close contact with the wearer's skin by the elastic force of the elastic member. Therefore, the liquid discharged from the wearer is absorbed by the absorbent body 6 without leaking out of the diaper 1. As the elastic member, a thread-like or strip-like rubber or the like can be appropriately selected.

[0013] FIG. 2 is an exploded perspective view of the absorbent pad 1 according to the embodiment. FIG. 3 is a plan view of the absorbent pad 1 according to the embodiment when it is stretched and viewed from the skin side. FIG. 4 is a cross-sectional view of the absorbent pad 1 according to the embodiment taken along line AA in FIG. 3. FIG. 5 is a cross-sectional view of the absorbent pad 1 according to the embodiment taken along line BB in FIG. 3. In the cross-sectional views shown below, each structure of the absorbent pad 1 is illustrated thicker than it actually is in order to make the internal structure of the absorbent pad 1 easier to understand, but in reality, the absorbent pad 1 is very thin. As shown in FIG. 3, the front body region 1F is a wide region on the front side of the absorbent pad 1, and the back body region 1R is a wide region on the back side of the absorbent pad 1. The crotch region 1B is a narrower region than the front body region 1F and the back body region 1R. Therefore, the absorbent pad 1 according to the present embodiment has a gourd shape with a narrowed crotch region 1B, which is wider on the front body region 1F and the back body region 1R side than the crotch region 1B in a plan view. This outer shape allows the absorbent pad 1 to easily conform to the wearer's abdomen and buttocks when worn. The outer shape of the absorbent pad 1 is not limited to a gourd shape, and may be, for example, For example, it may be approximately rectangular or approximately shuttlecock-shaped.

[0014] The absorbent pad 1 includes a topsheet 8 (an example of the "water-permeable sheet" in the present application) disposed on the skin side in the worn state. The topsheet 8 is a portion that contacts the wearer's skin in the worn state of the absorbent pad 1 and is formed of a liquid-permeable material that allows liquids such as urine to permeate. For the topsheet 8, woven fabrics, non-woven fabrics, porous films, etc. are used. Note that for the non-woven fabric, those obtained by hydrophilizing fibers of thermoplastic resins such as polypropylene, polyethylene, polyester, polyethylene terephthalate, and nylon may be used, or air-through non-woven fabrics, point-bond non-woven fabrics, spunbond non-woven fabrics, meltblown non-woven fabrics, etc. may be used.

[0015] And the absorbent pad 1 includes an absorber 6, a backsheet 5, and a cover sheet 4 that are sequentially laminated on the non-skin side of the topsheet 8.

[0016] The backsheet 5 (an example of the "non-water-permeable sheet" in the present application) is a non-water-permeable sheet having substantially the same planar shape (substantially gourd shape) as the absorbent pad 1. The backsheet 5 is a sheet formed of a thermoplastic non-water-permeable resin such as a polyethylene film in order to suppress leakage of the discharged liquid that has flowed into the absorber 6. The backsheet 5 has water repellency to prevent urine and moisture from seeping outside the absorbent pad 1 and breathability to suppress stuffiness in the worn state. The backsheet 5 has breathability by having a large number of minute ventilation holes formed therein.

[0017] The absorbent pad 1 includes a cover sheet 4 disposed on the non-skin side of the back sheet 5. The cover sheet 4 forms the outer surface of the absorbent pad 1 and has a rigidity capable of withstanding friction with diapers, underwear, etc. used in combination. In the front body region 1F and the back body region 1R, the length in the width direction of the cover sheet 4 is formed to be longer than the length in the width direction of the back sheet 5, covering the entire surface of the back sheet 5 from the non-skin side. The cover sheet 4 prevents the back sheet 5 from being damaged. Generally, a non-woven fabric made of synthetic fibers such as polypropylene, polyethylene, polyester, nylon, and polyethylene terephthalate is used for the cover sheet 4. The cover sheet 4 has liquid impermeability and moisture permeability.

[0018] Also, the absorbent pad 1 includes a pair of side sheets 9L and 9R (an example of the "leakage prevention wall forming sheet" referred to in the present application), which are disposed on the skin side of the top sheet 8 on both sides in the width direction of the absorbent pad 1, extend along the longitudinal direction, and are subjected to a water-repellent treatment on the skin side. The side sheets 9L and 9R are arranged such that the longitudinal ends thereof coincide with the longitudinal ends of the top sheet 8. The side sheets 9L and 9R have fixed regions 9LA and 9RA disposed on the outer side in the width direction. The fixed regions 9LA and 9RA are adhered to the top sheet 8, which is a member disposed on the non-skin side thereof, and the back sheet 5 with a hot melt adhesive HM.

[0019] The side sheets 9L and 9R are adhered to the top sheet 8 by a hot melt adhesive HM. The inner ends in the width direction of this hot melt adhesive HM are used as folding lines 3LL and 3LR (an example of the "folding line" referred to in the present application), and leak-proof walls 3L and 3R that can stand up are formed inside the folding lines 3LL and 3LR. The inner ends in the width direction of the side sheets 9L and 9R are free ends 9LB and 9RB that are the tips of the leak-proof walls 3L and 3R. Near the free ends 9LB and 9RB, two thread-like elastic members, thread rubbers 3BL and 3BR (an example of the "elastic member" referred to in the present application), are provided side by side in the width direction. Note that the thread rubbers 3BL and 3BR may be arranged one by one. The thread rubbers 3BL and 3BR are fixed to the side sheets 9L and 9R by the hot melt adhesive HM in an extended state in the longitudinal direction of the absorbent pad 1. The side sheets 9L and 9R have fixing parts 33L and 33R (an example of the "fixing part" referred to in the present application) near their longitudinal ends. By fixing the side sheets 9L and 9R to the top sheet 8, it is the part that becomes the starting point in the longitudinal direction when the leak-proof walls 3L and 3R stand up. The outer sides in the width direction of the side sheets 9L and 9R are also adhered to the top sheet 8, but inside the longitudinal direction of the fixing parts 33L and 33R, the inner side in the width direction is not adhered by the hot melt adhesive HM and can stand up on the skin side. When the leak-proof walls 3L and 3R inside the folding lines 3LL and 3LR stand up on the skin side due to the contraction of the thread rubbers 3BL and 3BR, the free ends 9LB and 9RB become the tips on the skin side. The standing leak-proof walls 3L and 3R prevent the movement of liquid and soft stools to the outer side in the width direction of the leak-proof walls 3L and 3R and suppress these lateral leaks.

[0020] The thread rubbers 3BL and 3BR extend to the vicinity of the inner longitudinal ends of the fixing parts 33L and 33R. More specifically, the thread rubbers 3BL and 3BR may be adjacent to the fixing parts 33L and 33R, or a part of them may overlap with the fixing parts 33L and 33R. The leak-proof walls 3L and 3R stand up due to the contraction force of the thread rubbers 3BL and 3BR, and the fixing parts 33L and 33R serve as the starting points of the contraction at the longitudinal ends. Therefore, the longitudinal ends of the thread rubbers 3BL and 3BR are arranged close to the fixing parts 33L and 33R and at least to the positions where the leak-proof walls 3L and 3R can stand up.

[0021] The side sheets 9L and 9R are formed in the same shape as the cover sheet 4 at the ends in the width direction. Also, the back sheet 5 is shorter than the cover sheet 4 in the width direction and is formed in the same shape as the cover sheet 4. Further, at the central part in the width direction at the longitudinal ends of the absorbent pad 1, the top sheet 8, the cover sheet 4, and the back sheet 5 are formed in the same shape. For this reason, a part of the cover sheet 4, the back sheet 5, the side sheets 9L and 9R, and the top sheet 8 forms the outer peripheral shape (outer shape) of the absorbent pad 1. Note that since the back sheet 5 has non-water permeability, the absorbent pad 1 may be configured such that the cover sheet 4 is omitted and the back sheet 5 forms the outer surface.

[0022] The absorbent pad 1 is disposed on the non-skin surface side of the top sheet 8 and includes an absorber 6 that absorbs and holds liquids such as urine. The absorber 6 is disposed on the non-skin surface side of the top sheet 8 including the crotch region 1B to absorb the liquid discharged by the wearer. On the skin surface side of the absorber 6, hot melt adhesives HM are applied in a plurality of rows of stripes at intervals in the width direction, and the absorber 6 and the top sheet 8 are adhered by these hot melt adhesives HM. In the present embodiment, the absorber 6 has an absorbent core 6C containing an absorbent material and a core wrap sheet 7 that wraps the entire absorbent core 6C. Note that the longitudinal direction of the absorber 6 coincides with the longitudinal direction of the absorbent core 6C and the core wrap sheet 7 and the longitudinal direction of the absorbent pad 1.

[0023] The absorption core 6C has a structure in which a granular absorbent resin (high molecular water absorbent material), such as a super absorbent polymer (SAP), which is a hydrophilic polymer having a cross-linked structure capable of absorbing and retaining water, is held in the gaps between short fibers of cellulose-based fibers such as pulp fibers, rayon fibers, or cotton fibers, or short fibers obtained by subjecting synthetic fibers such as polyethylene, polypropylene, polyester, nylon, or polyethylene terephthalate to a hydrophilization treatment.

[0024] The SAP particles in this embodiment refer to those obtained by granulating a resin composition containing SAP. The "resin composition containing SAP" as used herein is a concept encompassing both a composition consisting only of SAP and a composition having SAP as the main component and containing other substances to such an extent that it does not adversely affect water absorption. Examples of the "other substances" include additives such as surface modifiers added for the purpose of hydrophobizing the particle surface, and unreacted monomers remaining during the synthesis of SAP. The SAP particles can absorb a liquid about 10 to 100 times their own weight. For the SAP particles, for example, granular ones having a diameter of about 0.1 to 0.5 mm in the state before liquid absorption may be used.

[0025] While the SAP particles can gel and retain the liquid, it takes a certain amount of time for them to absorb the liquid. The absorbent pad 1 suppresses the backflow of the liquid by allowing the short fibers to diffuse the discharged liquid inside the absorption core 6C while decelerating it until the SAP particles absorb the liquid, and causing the discharged liquid to be absorbed by a wide range of SAP particles.

[0026] The absorption core 6C has an upper absorption mat 6A disposed on the top sheet 8 side and a lower absorption mat 6B disposed on the non-skin side. The absorption core 6C has a structure in which two layers of mats, namely the upper absorption mat 6A and the lower absorption mat 6B, are laminated. The upper absorption mat 6A and the lower absorption mat 6B are formed of the above-mentioned short fibers.

[0027] When the absorbent pad 1 is viewed in plan view, the upper absorbent mat 6A has a rectangular shape (oblong shape) in which the longitudinal direction of the absorbent pad 1 is the long side. Further, the upper absorbent mat 6A does not reach both end portions in the longitudinal direction of the absorber 6, and is also formed short within the absorber 6 when the absorbent pad 1 is viewed in the longitudinal direction.

[0028] The lower absorbent mat 6B is disposed below (non-skin surface side) the upper absorbent mat 6A when viewed from the top sheet 8 side. When the absorbent pad 1 is viewed in plan view, the lower absorbent mat 6B has a ladle shape with a constricted crotch region 1B that is wider on the front body region 1F and the back body region 1R sides than the crotch region 1B. Further, the four corners of the lower absorbent mat 6B have a shape chamfered in a straight line. The upper absorbent mat 6A and the lower absorbent mat 6B are laminated in the thickness direction so that the centers in the width direction thereof substantially coincide. Further, when the absorbent pad 1 is viewed in plan view, the lower absorbent mat 6B is formed larger than the upper absorbent mat 6A. Note that the longitudinal direction of the absorber 6 coincides with the longitudinal directions of the upper absorbent mat 6A and the lower absorbent mat 6B and the longitudinal direction of the absorbent pad 1. Further, the four corners of the lower absorbent mat 6B may have a shape chamfered in a curved line.

[0029] The upper absorbent mat 6A and the lower absorbent mat 6B are not limited to the above shapes. For example, the upper absorbent mat 6A may have a ladle shape with a constricted crotch region 1B that is wider on the front body region 1F and the back body region 1R sides than the crotch region 1B, and the lower absorbent mat 6B may have a rectangular shape (oblong shape) in which the longitudinal direction of the absorbent pad 1 is the long side. Further, the absorbent core 6C may be constituted by a single layer mat.

[0030] In addition, the absorption core 6C has groove portions 6L, 6H, and 6R. The groove portion 6H is provided at the center in the width direction of the absorption core 6C so as to extend in the longitudinal direction of the absorption core 6C on the back region 1R side. The groove portion 6H is formed to penetrate the upper absorption mat 6A, and the upper surface on the skin side of the groove portion 6H is formed of the core wrap sheet 7. The groove portion 6H is formed to penetrate the upper absorption mat 6A in the thickness direction at a position corresponding to the midline of the wearer in the worn state. The discharged liquid such as urine flows into the groove portion 6H and moves longitudinally along the groove portion 6H, and is quickly absorbed over a wide range in the longitudinal direction of the absorber 6. For this reason, the absorbent pad 1 according to the present embodiment can quickly diffuse the discharged liquid by including the groove portion 6H. Further, as shown in FIG. 3, the groove portion 6H does not reach the longitudinal ends of the absorber 6. For this reason, the discharged liquid that has moved to the outside in the longitudinal direction stays inside the groove portion 6H without reaching the longitudinal ends of the absorber 6 and is sequentially absorbed. Note that the groove portion 6H may be formed to penetrate the upper absorption mat 6A and the lower absorption mat 6B in the thickness direction, and the skin side may be formed in a concave shape by having less absorbent material such as short fibers forming the absorption core 6C than other portions, or it may be formed by squeezing the absorbent material forming the skin side of the absorption core 6C in the thickness direction.

[0031] As shown in FIG. 3, when the absorbent pad 1 is viewed in plan, the groove portion 6H has a uniform width and extends in the front-rear direction of the absorbent pad 1, and has a rectangular shape with both front and rear ends formed in an arc shape. The front end of the groove portion 6H is located on the rear side of the crotch region 1B, and the rear end of the groove portion 6H is located on the rear side of the back region 1R. Note that the groove portion 6H may be formed in a shape other than a rectangular shape, such as a polygonal shape or an elliptical shape, in plan view.

[0032] The groove portions 6L and 6R extend in the longitudinal direction of the absorbent core 6C in the lower thigh region 1B, and are provided in a pair on both sides in the width direction of the absorbent core 6C. The groove portions 6L and 6R are formed by penetrating the upper absorbent mat 6A, and the upper surface on the skin side of the groove portions 6L and 6R is formed by the core wrap sheet 7. The groove portions 6L and 6R are formed by penetrating the upper absorbent mat 6A in the thickness direction. The discharged liquid such as urine flows into the groove portions 6L and 6R, moves longitudinally along the groove portions 6L and 6R, and is quickly absorbed over a wide range in the longitudinal direction of the absorbent body 6. Therefore, the absorbent pad 1 according to the present embodiment can quickly diffuse the discharged liquid by providing the groove portions 6L and 6R. Further, as shown in FIG. 3, the groove portions 6L and 6R do not reach the longitudinal ends of the absorbent body 6. Therefore, the discharged liquid that has moved to the outside in the longitudinal direction stays inside the groove portions 6L and 6R without reaching the longitudinal ends of the absorbent body 6 and is sequentially absorbed. Note that the groove portions 6L and 6R may be formed by penetrating the upper absorbent mat 6A and the lower absorbent mat 6B in the thickness direction, and the skin side may be formed in a concave shape by having less absorbent material such as short fibers forming the absorbent core 6C than the portions other than the groove portions 6H, or may be formed by squeezing the absorbent material forming the skin side of the absorbent core 6C in the thickness direction.

[0033] As shown in FIG. 3, when the absorbent pad 1 is viewed in plan, the groove portions 6L and 6R have a uniform width and extend in the front-rear direction of the absorbent pad 1, and have a rectangular shape with both front and rear ends formed in an arc shape. The front end of the groove portions 6L and 6R is located on the rear side of the front body region 1F, and the rear end of the groove portions 6L and 6R is located on the rear side of the lower thigh region 1B. Note that the groove portions 6L and 6R may be formed in a shape other than a rectangular shape, such as other polygonal shapes or an elliptical shape, in plan view.

[0034] Note that the configuration and number of the groove portions are not limited to the above configuration and number. For example, the groove portions may not be provided in the absorbent pad 1, or only one groove portion may be provided by extending the front end of the groove portion 6H to the rear side of the front body region 1F.

[0035] The absorber 6 according to this embodiment has a core wrap sheet 7. The core wrap sheet 7 is a water-permeable sheet that wraps the entire absorption core 6C. More specifically, it covers the skin side, non-skin side, and side surfaces of the absorption core 6C. By wrapping the absorption core 6C, the core wrap sheet 7 protects the shape of the absorption core 6C and prevents it from collapsing, and also prevents the deviation of the SAP particles contained in the absorption core 6C. Also, SAP particles in a state where they have not absorbed moisture are hard and sandy. If SAP particles that have not absorbed the deviated moisture come into direct contact with the wearer's skin surface, it may cause discomfort to the wearer. Therefore, the absorption core 6C is wrapped with the core wrap sheet 7 to prevent the absorption core 6C from collapsing and to prevent the SAP particles from deviating outside the absorber 6.

[0036] In this embodiment, the core wrap sheet 7 includes an upper core wrap sheet 7A disposed between the upper absorption mat 6A and the top sheet 8, and a lower core wrap sheet 7B disposed on the non-skin side of the lower absorption mat 6B, covering the side surfaces of the absorption core 6C, and further covering the outer side in the width direction of the upper core wrap sheet 7A. The core wrap sheet 7 is formed of two sheets. For the core wrap sheet 7, a thin non-woven fabric such as a pulp fiber sheet, a hydrophilic air-through non-woven fabric, a spunbond non-woven fabric, or the non-woven fabric used for the other members described above is used. In this embodiment, for the upper core wrap sheet 7A, an SMS non-woven fabric made of polyethylene, polypropylene, or polyethylene terephthalate as raw materials or a hydrophilic spunbond non-woven fabric is used, and for the lower core wrap sheet 7B, tissue paper is used. When the core wrap sheet 7 is formed of two sheets it is also possible to form the upper core wrap sheet 7A and the lower core wrap sheet 7B from the same material. The SMS non-woven fabric is a three-layer laminated non-woven fabric in the order of spunbond, meltblown, and spunbond. Also, as an example, the core wrap sheet 7 can be tissue paper. Note that the core wrap sheet 7 may be composed of a single sheet. Also, the absorber 6 may not have the core wrap sheet 7 and may be composed only of the absorption core 6C.

[0037] When the absorbent pad 1 is viewed in plan view, ear portions 10L and 10R may be provided in regions extending outward in the width direction of the folding lines 3LL and 3LR of the leakage-preventing walls 3L and 3R. The ear portions 10L and 10R are composed of side sheets 9L and 9R, a top sheet 8, a back sheet 5, and a cover sheet 4. In the present embodiment, the ear portions 10L and 10R are formed in the front body region 1F and the back body region 1R. Further, the lower absorbent mat 6B is disposed including the outer sides in the width direction of the free ends 9LB and 9RB. The absorbent pad 1 can increase the liquid absorption amount by forming the lower absorbent mat 6B large while enhancing the cushioning property in the ear portions 10L and 10R. Note that the ear portions 10L and 10R may be formed in either one of the front body region 1F or the back body region 1R.

[0038] The absorber 6 does not extend to the outer edge of the absorbent pad 1. And, among the outer edges, on the center side in the width direction where the side sheets 9L and 9R do not exist, the top sheet 8, the back sheet 5, and the cover sheet 4 are firmly adhered with an adhesive such as a hot melt adhesive to form an outer edge portion 11. Also, on the outer side in the width direction where the side sheets 9L and 9R exist and the top sheet 8 does not exist, the side sheets 9L and 9R, the back sheet 5, and the cover sheet 4 are firmly adhered with an adhesive such as a hot melt adhesive to form an outer edge portion 11.

[0039] The absorbent pad 1 includes non - adhesive portions 12 where, between the top sheet 8 and the absorbent core 6C, the upper core wrap sheet 7A laminated between the fixing portions 33L and 33R and the adjacent portions inside the width direction of the absorbent pad 1 closer to the fixing portions 33L and 33R are not adhered. The non - adhesive portion 12 is provided between the upper core wrap sheet 7A and the absorbent core 6C and is an area where the upper core wrap sheet 7A and the absorbent core 6C are not adhered. Since the upper core wrap sheet 7A and the absorbent core 6C are not adhered, even when the top sheet 8 and the upper core wrap sheet 7A are pulled toward the crotch region 1B side due to the shrinkage of the leakage - preventing walls 3L and 3R, the pulling force due to the shrinkage of the leakage - preventing walls 3L and 3R is not directly transmitted to the absorbent core 6C. Therefore, the absorbent core 6C does not fall toward the crotch region 1B side. Thus, it is possible to suppress the longitudinal end side of the absorbent pad 1 from falling toward the crotch region 1B side.

[0040] Normally, an absorbent pad is provided with leakage - preventing walls, which are made to stand on the wearer's skin side to inhibit the movement of liquid and soft feces and suppress lateral leakage. To make the leakage - preventing walls stand up, it is necessary to increase the shrinkage rate of the leakage - preventing walls. However, if the shrinkage rate of the leakage - preventing walls is too high, the force pulling the longitudinal end side of the absorbent pad toward the longitudinal center side of the absorbent pad is strong, and the absorbent pad may fall toward the skin side, which may make the wearing operation troublesome. Therefore, if the shrinkage rate of the leakage - preventing walls is decreased, the leakage - preventing walls may not stand up sufficiently, and there may be a risk of lateral leakage because they do not adhere closely to the wearer.

[0041] On the other hand, the absorbent pad 1 according to the present embodiment includes non - adhesive portions 12 on the crotch region 1B side rather than the fixing portions 33L and 33R and the fixing portions 33L and 33R. By providing the non - adhesive portions 12, when the fixing portions 33L and 33R are pulled toward the longitudinal center side of the absorbent pad 1 by the leakage - preventing walls 3L and 3R, the absorbent core 6C separated from the non - adhesive portions 12 is not pulled toward the longitudinal center side of the absorbent pad 1, and the top sheet 8 and the upper core wrap sheet 7A are pulled toward the center side of the absorbent pad 1. Since the absorbent core 6C has high rigidity, it is possible to suppress the longitudinal end side of the absorbent pad 1 from falling toward the center side. Also, in the worn state of the absorbent pad 1, of the wearer's Due to body pressure, the topsheet 8 and the upper core wrap sheet 7A moved to the lower thigh region 1B side are compressed on the non-skin side, and the leakage prevention walls 3L and 3R can be erected from the topsheet 8 by the contraction force of the leakage prevention walls 3L and 3R. Therefore, even if the contraction rate of the leakage prevention walls 3L and 3R is not reduced, it is possible to suppress the absorbent pad 1 from falling to the skin side and facilitate the wearing operation.

[0042] The non-adhesive portion 12 is formed in the front body region 1F corresponding to the abdominal side of the wearer. In the operation of wearing the absorbent pad 1, since the front body region 1F side is erected, the absorbent pad 1 can be easily worn on the wearer. Therefore, it is preferable to erect the front body region 1F side. When the front body region 1F is erected, by providing the non-adhesive portion 12 on the absorbent pad 1, even if the contraction force of the leakage prevention walls 3L and 3R is strong, it is possible to suppress the front body region 1F side from falling to the lower thigh region 1B side. Further, in the wearing state, when the body pressure of the wearer is not applied to the front body region 1F side, the topsheet 8 and the upper core wrap sheet 7A are separated from the absorbent core 6C and are pulled to the lower thigh region 1B side. At this time, a pocket portion described later is formed, and it is possible to suppress abdominal leakage in which the discharged liquid such as urine leaks from the abdominal side of the wearer.

[0043] The non-adhesive portion 12 is formed in the back body region 1R corresponding to the back side of the wearer. In the operation of wearing the absorbent pad 1, usually, the back body region 1R is passed through the wearer's thigh from the front side of the wearer and is often arranged on the back side of the wearer. Therefore, the back body region 1R is preferably flat during the wearing operation. Since the absorbent core 6C does not fall to the central side in the longitudinal direction of the absorbent pad 1 due to the non-adhesive portion 12, the wearer's thigh can be easily passed through. Further, in the wearing state, due to the contraction of the thread rubbers 3BL and 3BR, the leakage prevention walls 3L and 3R have sufficient contraction force to stand up from the topsheet 8, adhere to the wearer, and suppress side leakage. Note that the topsheet 8 and the upper core wrap sheet 7A floating above the absorbent core 6C are compressed by the body pressure of the wearer in the wearing state.

[0044] The non - adhering portion 12 may be formed by releasing the temporary adhesion of the temporary adhesion portion. The non - adhering portion 12 provided in the absorbent pad 1 according to the present embodiment is formed by peeling off the temporary adhesion of the temporary adhesion portion. The temporary adhesion portion is an area where the materials being adhered are temporarily adhered with an adhesive force such that they can be peeled off without breaking the adhered materials. Since the upper core wrap sheet 7A and the absorbent core 6C are temporarily adhered, when the temporary adhesion of the temporary adhesion portion is released, it becomes the non - adhering portion 12 where the upper core wrap sheet 7A and the absorbent core 6C are not adhered. When the temporary adhesion of the temporary adhesion portion is released and it becomes the non - adhering portion 12, even if the topsheet 8 and the upper core wrap sheet 7A are pulled toward the crotch region 1B side due to the contraction of the leak - proof walls 3L, 3R, the pulling force due to the contraction of the leak - proof walls 3L, 3R is not directly transmitted to the absorbent core 6C. Therefore, the absorbent core 6C does not fall toward the crotch region 1B side. Thus, it is possible to suppress the longitudinal end portion side of the absorbent pad 1 from falling toward the crotch region 1B side.

[0045] The peel strength in the thickness direction of the temporary adhesion portion is smaller than the tensile strength in the longitudinal direction of the absorbent pad 1 due to the contraction of the leak - proof walls 3L, 3R. Therefore, in the worn state, the temporary adhesion is released due to the contraction of the leak - proof walls 3L, 3R, the upper core wrap sheet 7A and the absorbent core 6C are separated from each other, and the non - adhering portion 12 is formed.

[0046] The non - adhering portion 12 is preferably formed by releasing the temporary adhesion of the temporary adhesion portion. By temporarily adhering the absorbent core 6C and the upper core wrap sheet 7A with the temporary adhesion portion, in the manufacturing process of the absorbent pad 1, the materials can be arranged and assembled as designed. Also, in the worn state, since the peel strength of the temporary adhesion portion is smaller than the tensile strength in the longitudinal direction of the absorbent pad 1 due to the contraction of the leak - proof walls 3L, 3R, the temporary adhesion is released due to the contraction of the leak - proof walls 3L, 3R, and the upper core wrap sheet 7A and the absorbent core 6C are separated from each other. Thus, the absorbent core 6C does not fall toward the crotch region 1B side, and it is possible to suppress the longitudinal end portion side of the absorbent pad 1 from falling toward the crotch region 1B side. Note that during the wearing operation of the absorbent pad 1 , the temporary adhesion may be released to form the non - adhering portion 12.

[0047] FIG. 6 is a diagram for explaining a pocket portion P formed by the non-adhesive portion 12. Since the configurations of the pocket portion P provided in the back body region 1R and the pocket portion P provided in the front body region 1F are the same, hereinafter, the pocket portion P provided in the front body region 1F will be taken up and described. Note that, for the sake of explanation, illustration of some members is omitted. FIG. 6(A) is an enlarged view of the front end side in the longitudinal direction of the absorbent pad 1, and the leakage-preventing walls 3L, 3R are in an upright state. The fixing portions 33L, 33R disposed inside the width direction of the side sheets 9L, 9R in the vicinity of the longitudinal ends of the absorbent pad 1 tend to stand up toward the skin side by the biasing force of the thread rubbers 3BL, 3BR when the leakage-preventing walls 3L, 3R stand up. The outer sides in the longitudinal direction of the fixing portions 33L, 33R are adhesively bonded to the outer edge portion 11 with high strength and do not peel off. The fixing portions 33L, 33R and the top sheet 8 are also firmly adhesively bonded even inside the longitudinal direction of the fixing portions 33L, 33R. In the region corresponding to the inner side in the longitudinal direction of the fixing portions 33L, 33R, the non-adhesive portion 12 extends between the upper core wrap sheet 7A and the absorbent core 6C.

[0048] When the leakage-preventing walls 3L, 3R tend to stand up by the biasing force of the thread rubbers 3BL, 3BR, the fixing portions 33L, 33R lift up toward the skin side together with the top sheet 8 and the upper core wrap sheet 7A. Then, a bellows-like folded portion is formed between the portion that still adheres to the absorbent core 6C by a part of the top sheet 8 and the upper core wrap sheet 7A floating up toward the skin side along with the fixing portions 33L, 33R. The inside of the bellows-like folded portion becomes the pocket portion P. In the worn state, the discharged liquid flowing toward the outer side in the longitudinal direction falls into the inside of the pocket portion P and the flow thereof is inhibited, and the leakage from the longitudinal end, such as abdominal leakage and back leakage, can be suppressed.

[0049] Thus, a non-adhesive portion 12 is provided between the upper core wrap sheet 7A and the absorbent core 6C on the outer side in the longitudinal direction of the absorbent pad 1, and a part of the non-adhesive portion 12 is configured to stand up on the skin side in response to the rising of the fixing portions 33L and 33R corresponding to the rising of the leakage-preventing walls 3L and 3R, whereby the pocket portion P can be formed. Therefore, it is possible to suppress the leakage of the discharged liquid such as urine that has reached the longitudinal end of the absorbent pad 1.

[0050] The absorbent core 6C contains pulp fibers. Therefore, by providing the non-adhesive portion 12 formed by releasing the temporary adhesion of the temporary adhesive portion between the upper core wrap sheet 7A and the absorbent core 6C, when the temporary adhesive portion peels off, the pulp fibers that are the contents of the absorbent core 6C are attached to the upper core wrap sheet 7A and peeled off from the absorbent core 6C to form a thin pulp fiber layer on the non-skin side of the pocket portion P. The pulp fiber layer absorbs the discharged liquid such as urine that has reached the pocket portion P and promotes the movement of the discharged liquid to the non-skin side of the top sheet 8. In particular, for watery feces, by absorbing moisture on the non-skin side of the top sheet 8, the fluidity of the feces is reduced and it can be held in the absorbent pad 1.

[0051] FIG. 7 is a diagram showing the distribution state of the absorbent pad 1 according to the embodiment. The absorbent pad 1 is folded in three in the longitudinal direction and a plurality of them are enclosed in the package 13 for distribution. Therefore, in the opened state, the absorbent pad 1 has two folding lines extending in the width direction. When opening the package 13 and using the absorbent pad 1, the wearer spreads the absorbent pad 1, places the wearer on the back region 1R, and lifts the front region 1F to wear it on the wearer.

[0052] In a portion corresponding to the folding line at the time of packaging, in addition to the upper absorbent mat 6A, the lower absorbent mat 6B extends, and the absorbent core 6C is multiple. That is, the basis weight of the absorber 6 at the positions where the folding lines exist on the abdominal side and the back side is higher than the basis weight of the absorber 6 at the abdominal side end and the back side end. The absorbent pad 1 has a high rigidity due to the high rigidity of the absorber 6 in the portion with the folding line, and the absorbent pad 1 is removed from the package 13 When taken out and unfolded, it becomes substantially flat except for the leakage-preventing walls 3L and 3R that stand up on the skin side. The absorbent pad 1 according to the present embodiment is biased by thread rubbers 3BL and 3BR so as to be able to follow the body surface of the wearer during the wearing operation. If the absorbent pad 1 is in a state of being easily bent along the folding line, there is a risk that the unfolded absorbent pad 1 will be folded again by the biasing force of the thread rubbers 3BL and 3BR. Therefore, by increasing the rigidity in the vicinity of the folding line, the unfolded absorbent pad 1 is prevented from bending along the folding line.

[0053] When the absorbent pad 1 is worn on the wearer, the absorbent pad 1 is unfolded, the wearer is placed on the back waist region 1R, and the front waist region 1F is lifted. In the absorbent pad 1 according to the present embodiment, when a stretching force of 5 N is applied for 5 seconds in the longitudinal direction when the absorbent pad 1 is unfolded, the front waist region 1F of the diaper 1 gradually stands up due to the biasing force of the thread rubbers 3BL and 3BR and follows the lower abdomen of the wearer. Also, for the back waist region 1R where the wearer's buttocks come into contact, the ends are not made to stand up. Therefore, since the front waist region 1F of the absorbent pad 1 stands up before wearing, the absorbent pad 1 can be easily worn. The person performing the wearing operation of the absorbent pad 1 on the wearer does not need to lift the front waist region 1F during wearing, so the difficulty of the wearing operation is significantly reduced.

[0054] <Modification Example> FIG. 8 is a plan view of the absorbent pad 1 according to the modified example. The thread rubbers 3BL and 3BR may be arranged so as to be biased in the longitudinal direction of the absorbent pad 1. The thread rubbers 3BL and 3BR are attached to the side sheets 9L and 9R of the absorbent pad 1 in the longitudinal direction. The thread rubbers 3BL and 3BR raise the leakage-preventing walls 3L and 3R and bias the absorbent pad 1 toward the inner side in the longitudinal direction. As shown in FIG. 8, the thread rubbers 3BL and 3BR are not provided symmetrically in the longitudinal direction, but are unevenly distributed from the crotch region 1B to the front body region 1F, and the distances between the longitudinal ends of the thread rubbers 3BL and 3BR and the fixing portions 33L and 33R are shorter on the ventral side than on the dorsal side. That is, the contraction region of the thread rubbers 3BL and 3BR is biased toward the abdominal side rather than the dorsal side. Note that the contraction force of the thread rubbers 3BL and 3BR may be made stronger on the abdominal side than on the dorsal side, or the contraction force may be made stronger on the abdominal side while the contraction region of the thread rubbers 3BL and 3BR is biased toward the abdominal side.

[0055] FIG. 9 is a view showing the rising of the front body region 1F of the absorbent pad 1 according to the modified example. FIG. 9(A) is a view showing the absorbent pad 1 in the unfolded state. FIG. 9(B) is a view showing a state in which the front body region 1F side of the absorbent pad 1 has risen. When the wearer holds both longitudinal ends of the absorbent pad 1 and pulls in the longitudinal direction, in the front body region 1F where the thread rubbers 3BL and 3BR extend or the contraction force is unevenly distributed, the fixing portions 33L and 33R are pulled by the biasing force of the thread rubbers 3BL and 3BR, and the longitudinal end side of the front body region 1F rises.

[0056] On the other hand, in the back body region 1R, the thread rubbers 3BL and 3BR do not extend to the vicinity of the fixing portions 33L and 33R, or the contraction force of the thread rubbers 3BL and 3BR is low compared with the vicinity of the front body region 1F. Further, since the absorbent body 6 has high rigidity, it hardly rises even by the biasing force of the thread rubbers 3BL and 3BR. That is, in a state where the end on the front body region 1F side of the diaper 1 has risen, the distance from the horizontal plane of the longitudinal end is longer on the ventral side than on the dorsal side.

[0057] Since the front body region 1F of the absorbent pad 1 stands up before wearing, the absorbent pad 1 can be easily worn by the wearer. The person who performs the wearing operation of the absorbent pad 1 on the wearer does not need to lift the front body region 1F during wearing, so the difficulty of the wearing operation is significantly reduced.

[0058] <Other Embodiments> The non-adhesive part 12 may be provided in the front body region 1F and the back body region 1R, or may be provided in either the front body region 1F or the back body region 1R.

[0059] The present invention is applicable not only to absorbent pads but also to pant-type diapers and tape-type diapers.

[0060] The features included in each of the embodiments and their modifications disclosed above can be combined with each other.

Explanation of Reference Numerals

[0061] 1 ··· Absorbent pad 1F ··· Front body region 1B ··· Crotch region 1R ··· Back body region 3L, 3R ··· Leakage prevention walls 3BL, 3BR ··· Thread rubber 3LL, 3LR ··· Folding lines 33L, 33R ··· Fixing parts 4 ··· Cover sheet 5 ··· Back sheet 6 ··· Absorbent body 6C ··· Absorbent core 6A ··· Upper absorbent mat 6B ··· Lower absorbent mat 6L, 6H, 6R ··· Groove parts 7 ··· Core wrap sheet 7A ··· Upper core wrap sheet 7B ··· Lower core wrap sheet 8 ··· Top sheet 9L, 9R ··· Side sheets 9LA, 9RA ··· Fixed regions 9LB, 9RB ··· Free ends 11··Outer edge part 12··Non - adhesion part 13··Packaging P··Pocket area

Claims

1. A length along a longitudinal direction corresponding to the front - rear direction of the wearer, a length along a width direction orthogonal to the longitudinal direction, an absorber having an absorption core that is at least disposed in a region corresponding to the crotch of the wearer and absorbs liquid, a water - permeable sheet disposed on the skin - facing side of the absorber, a pair of leak - proof wall forming sheets that are disposed on the skin - facing side of the water - permeable sheet and on both sides in the width direction to form leak - proof walls for preventing liquid leakage, the inner side in the width direction is folded back to the skin - facing side along a fold line extending in the longitudinal direction, and a fixing portion where the inner side in the width direction is connected to the water - permeable sheet outside the longitudinal direction and closer to the fold line, and an elastic member adhesively bonded to extend in the longitudinal direction in an extended state on the free - end side of the leak - proof wall; a non - adhesion portion where the sheets laminated between the water - permeable sheet and the absorption core are non - adhered inside the fixing portion and in the inner side in the width direction of the fixing portion; An absorbent article.

2. The non - adhesion portion is formed by peeling off a temporary adhesion portion where the laminated sheets are temporarily adhered, The absorbent article according to claim 1.

3. The peel strength of the temporary adhesion portion is smaller than the tensile force of the water - permeable sheet by the leak - proof wall, The absorbent article according to claim 2.

4. The absorption core contains pulp fibers, The temporary adhesion portion is formed by temporarily adhering the absorption core and the sheet on the skin - facing side of the absorption core, The absorbent article according to claim 2.

5. The non - adhesion portion is disposed on the ventral side of the wearer, The absorbent article according to claim 1.

6. The non - adhesion portion is disposed on the dorsal side of the wearer, The absorbent article according to claim 1.

7. The contraction force of the elastic member is stronger on the abdominal side of the wearer than on the dorsal side of the wearer, The absorbent article according to any one of claims 1 to 6.

8. The contraction region of the elastic member is biased toward the abdominal side of the wearer rather than the dorsal side of the wearer, The absorbent article according to any one of claims 1 to 6.

9. In the region outside the longitudinal direction of the fixing portion, the elastic member does not extend, In the region corresponding to the width direction with respect to the region outside the longitudinal direction of the fixing portion, the absorber does not extend, and an outer edge portion joining the water - permeable sheet, a non - water - permeable sheet disposed on the non - skin - facing side of the absorber, and the fixing portion is disposed, The absorbent article according to any one of claims 1 to 6.

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