JP2009207598A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article having excellent fitting property and a property for preventing a liquid leakage in which lowering of both these properties is difficult to occur while wearing. <P>SOLUTION: In the absorbent article having a substantially elongate absorbent body 5 having a front face sheet, a rear face sheet, and an absorbent body interposed between both the sheets and a pair of leakage preventing walls 6, 6 formed in both side of the absorbent body 5 in a longitudinal direction, the leakage preventing walls 6, 6 have highly raised portions in which elastic sheets form convex shapes projecting to a skin contacting face side and hollow cavities are formed in the same in an excrete portion area A arranged by facing a liquid excrete portion of a wearer in a longitudinal direction of the absorbent article, and have lowly raised portions having cross-sectional shapes in a width direction different from that of the highly raised portions and lower than the highly raised portions in the front side and/or the rear side of the excrete portion area. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorbent article such as a sanitary napkin or an incontinence pad, and more particularly relates to an absorbent article that is excellent in fit and liquid leakage prevention properties and that both of these performances are unlikely to deteriorate during wearing.

  Conventionally, as an absorbent article such as a sanitary napkin or an incontinence pad, an absorbent article having an elastic stretchable part that elastically stretches in the longitudinal direction and abuts on the skin of the wearer in a longitudinal direction is known. Yes. Such a leak-proof wall deforms the absorbent article into a preferable three-dimensional shape that fits the wearer (particularly the longitudinal cross-section is concave), improves the adhesion to the wearer's skin, and ensures liquid leakage. The purpose is to prevent. However, in conventional absorbent articles, the leak-proof wall may fall or collapse due to the body pressure of the wearer during wearing, and the function of the leak-proof wall may not be fully expressed, and excellent fit and liquid leakage In some cases, preventability could not be obtained. JP-A-8-182702 (Patent Document 1) discloses an absorbent article provided with a leak-proof wall having a leak-proof surface that abuts the wearer's skin in a planar manner at the upper end. However, since the leak-proof wall is provided only in the part facing the liquid excretion part of the wearer, the fit in the rear part arranged behind the part may not always be sufficient. .

  In JP 2001-95844 A (Patent Document 2), by forming a leak-proof wall having a structure folded on a sanitary napkin, the width of the absorption surface can be widened, so that the liquid can be easily absorbed, and the narrow width Even if it is a leak-proof wall, the standing property can be improved and it can be excellent in the side-leakage prevention effect. Further, a leak-proof wall is formed behind the liquid excretion part to further improve the side leakage prevention property. However, in the leak-proof wall having the same height as the liquid excretion part also in the rear, the fit with the absorbent surface of the sanitary napkin in the rear tends to be lowered due to the curved sanitary napkin and the standing property of the leak-proof wall. , Easy to induce transmission leakage in the rear.

  For this reason, the site | part which suppresses the height of the leak-proof wall in the back like a multilayer part is formed in Unexamined-Japanese-Patent No. 2003-245306 (patent document 3), and the curve of an absorbent article and leak-proof wall The height is suppressed and the fit at the rear is enhanced. However, these leak-proof walls in which the sheet-like elastic member is formed in a planar shape are folded by the pressure during use and come into contact with the surface of the absorbent article, and the excretory liquid is partly disposed on the leak-proof wall. In some cases, it is easy to indirectly adhere, and even when no leakage occurs, it is easy to give an impression of leakage.

  On the other hand, in Japanese Patent Application Laid-Open No. 11-19123 (Patent Document 4), sheet-like elastic members are arranged on both sides of an absorbent article so that the cross section in the width direction has an arch shape, and has high flexibility and leakage prevention. A technique for forming a leak-proof wall has been proposed. According to this technique, the arch shape easily deforms and conforms well to the shape of the wearer's body, and has side leakage prevention properties.

JP-A-8-182702 JP 2001-95844 A JP 2003-245306 A Japanese Patent Laid-Open No. 11-19123

As in the technique described in Patent Document 4, when a leak-proof wall having an arch-shaped cross section in the width direction is formed on both sides of the absorbent article, it has a good fit and a shape in which both ends of the leak-proof wall are fixed. For this reason, even if pressure is applied during use, it is difficult to protrude from both ends fixed, and indirect contamination is difficult to occur. For this reason, in addition to the original side leakage prevention property, the impression of preventing side leakage is also high.
However, in recent years, in sanitary napkins for night use and the like, the length of the absorbent article tends to be long, and as the length of the absorbent article is long, the leak-proof wall is also long. As in the absorbent article described in 3, it is important to suppress the height of parts other than the liquid excretion part in order to maintain leakproofness and fitability other than the liquid excretion part. In order to suppress the height of the arch-shaped leak-proof wall as in Document 4, a means for improving the elastic contraction force of the leak-proof wall or a means for narrowing the width of both ends of the arch can be considered. However, when the elastic contraction force is improved, separation from the body is likely to occur, the degree of curvature of the absorbent article is increased, and the fit with the absorbent article and the deformability of the leak-proof wall are lowered. When the width is narrowed, the standing stability and the standing maintenance property are low, the leakage preventing property is lowered, and the shape of the leakage preventing wall shape in the excretion region is difficult to maintain. In addition, the arch shape has a disadvantage that it is difficult for the user to recognize the presence of the leak-proof wall (it is difficult to recognize a three-dimensional shape because the height continuously changes in the width direction).

  Accordingly, an object of the present invention is to provide an absorbent article that is excellent in fit and liquid leakage prevention properties, and that both of these performances are unlikely to deteriorate during wearing.

  The present invention relates to an absorbent article having a topsheet, a backsheet, and an absorbent main body having an absorbent body interposed between both sheets, and leak-proof walls formed on both sides in the longitudinal direction of the absorbent main body. The leak-proof wall is formed in the excretory part region disposed opposite the wearer's liquid excretion part in the longitudinal direction of the absorbent article, and the elastic sheet has a convex shape on the skin contact surface side, and a cavity is formed inside. Has a high standing part and has a cavity in the front and / or rear of the excretion part region, but the cross-sectional shape in the width direction is different from the high standing part and the height is lower than the high standing part. The object is achieved by providing an absorbent article characterized by having a low standing part.

  The absorbent article of the present invention prevents the separation of the absorbent article and the body due to excessive bending in the longitudinal direction due to the formation of the leak-proof wall and the deterioration of the deformation follow-up performance of the leak-proof wall, and a stable fit without wearing a sense of incongruity It is easy to recognize the effect visually because it has properties and hardly leaks.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. 1-3 is a figure which shows the sanitary napkin of 1st Embodiment of this invention, FIG. 1 is the perspective view cut | disconnected virtually in the excretion part area | region, FIG. 2 is extending the leak-proof wall. FIG. 3 is a plan view of the napkin side portion in a curved state, and FIG. 3B is a cross-sectional view taken along the line II-II. And (c) III-III sectional view.

  As shown in FIG. 1, the sanitary napkin 1 (hereinafter, also simply referred to as napkin 1) of the first embodiment includes a top sheet 2 positioned on the skin contact surface side and a back sheet positioned on the non-skin contact surface side. 3 and a vertically long absorbent main body 5 having an absorbent body 4 disposed between the two sheets 2 and 3, and a pair of leak-proof walls 6 and 6 formed on both sides in the longitudinal direction of the absorbent main body 5. have. As shown in FIGS. 1 and 2, the napkin 1 has a vertically long rectangular shape with rounded corners, and the absorber 4 has a vertically long rectangular shape with rounded corners as well. The napkin 1 has a shape that is long in the same direction as the longitudinal direction of the absorbent main body 5. When the napkin 1 is worn, the liquid excretion portion ( It has an excretion part region A that is disposed opposite to the vaginal opening, and before and after that, a front part B that is arranged in front of the wearer's liquid excretion part (abdominal side) and a rear part of the wearer's liquid excretion part ( And a rear portion C arranged on the back side. The napkin 1 has a symmetrical shape with respect to a center line extending in the longitudinal direction of the napkin 1.

  The leak-proof wall 6 is formed using a stretchable sheet 61. The top sheet 2 is joined on the absorbent body 4 and an elastic sheet 61 that forms the leak-proof wall 6, and the elastic sheet 61 forms the leak-proof wall 6 and is on the longitudinal side of the absorbent body 4. It extends outward in the width direction from the edge 4a. The back sheet 3 has an extending portion that extends outward in the width direction from each of the side edges 4 a in the longitudinal direction of the absorbent body 4. Each of the stretchable sheet 6 and the back sheet 3 extends outward from the outer peripheral edge of the absorbent body 4, and the outer periphery of the napkin 1 is formed by the extended outer peripheral edges of the sheets 3 and 6. It is. Both sheets 3 and 6 extending from the outer peripheral edge of the absorbent body 4 are joined to each other by joining means such as an adhesive or heat seal, and are disposed opposite to the liquid excretion portion of the wearer in the longitudinal direction of the napkin 1. In the excretion part area | region A, the wing part 7 which covers the crotch part of underwear (shorts etc.), and performs fixation by a stain prevention and an adhesive is formed.

  In the present specification, the “longitudinal direction” is a direction along the longitudinal direction of the absorbent article or the absorbent body (vertical direction in FIG. 2), and the “width direction” is a direction orthogonal to the longitudinal direction (FIG. 2). In the horizontal direction). The “skin contact surface” is a surface directed toward the wearer's skin when the absorbent article is worn, and the “non-skin contact surface” is the underwear side (the wearer's skin side and the wearer's skin side). Is the side facing the other side.

  On the skin contact surface of the sanitary napkin 1 according to the first embodiment, grooves 8 and 8 along the longitudinal direction of the napkin 1 are formed by embossing. In a natural state, when the skin contact surface side of the sanitary napkin 1 is viewed in plan, the groove 8 is not covered with the leak-proof wall 6. In FIG. 3, illustration of the groove 8 is omitted.

  In the sanitary napkin 1 of the first embodiment, as shown in FIG. 1 or FIG. 3, a belt-like stretchable sheet 61 is disposed and fixed in the longitudinal direction of the sanitary napkin 1, and the stretchable sheet Due to the shrinkage of 61, leak-proof walls 6, 6 having a three-dimensional form with convex convex curved shapes on the skin contact surface side are formed.

  More specifically, the elastic sheets 6 and 6 are disposed on the skin contact surface side of the absorbent body 4 constituting a part of the absorbent main body 5 on both sides of the sanitary napkin 1, respectively. Due to the contraction of the elastic sheets 6 and 6, convex portions that extend in the longitudinal direction of the sanitary napkin 1 on both sides of the sanitary napkin 1, and the cross-sectional shape in the width direction is a convex arc shape on the skin contact surface side. The leak-proof walls 6 and 6 which have a cavity inside are formed by the three-dimensional form of a curved surface shape. The pair of stretchable sheets 6 and 6 are fixed at both side edges in a state of being stretched in the longitudinal direction of the sanitary napkin 1. Each stretchable sheet 6 has a shape that is long in the same direction as the longitudinal direction of the napkin 1, and both end portions in the longitudinal direction are end seal portions 9, 9 formed at both end portions in the longitudinal direction of the napkin 1. It is fixed.

The leak-proof wall 6 has, in the excretion part region A in the longitudinal direction of the napkin 1, a high upright part 6A in which the elastic sheet 61 has a convex shape on the skin contact surface side and a cavity is formed inside. Yes.
The stretchable sheet 61 used in the present embodiment is a hot melt adhesive in which two substantially non-stretchable sheets 62 and 63 sandwich a plurality of elastic members 64 in an stretched state therebetween. It is a composite sheet formed by bonding through an adhesive such as an agent. The two sheets 62 and 63 have the same shape and size, and both are made of nonwoven fabric. As shown in FIG. 3 (b), the stretchable sheet 61 is fixed on the surface on the skin contact surface side of the absorbent body 4 at a predetermined width from the one side edge 61 a on the width direction center portion side of the napkin 1. Has been. One side of the predetermined width portion (inner fixed portion) 61b is joined to the absorbent body 4 by an adhesive (not shown). The other surface of the inner fixing portion 61b is bonded to the topsheet 2 with an adhesive 61c. The elastic sheet 61 has an elastic region 61e in which a plurality of elastic members 64 are arranged in parallel with each other at a predetermined distance from the inner fixed end 61d, which is one end of the inner fixed portion 61b. Further, on the outer side in the width direction, the sheet (back sheet 3) arranged on the non-skin contact surface side of the absorber 4 extends outward in the width direction from the side edge portion 4a of the absorber 4. It has an outer fixing portion 61f joined to the portion. The elastic region 61e and the outer fixed end 61g, which is one end of the outer fixed portion 61f, are also separated by a predetermined width. As shown in FIG. 3B, the elastic sheet 61 has a loop shape between the inner fixed end 61d and the outer fixed end 61g when the elastic member 64 fixed to the elastic region 61e contracts. As a result, the stretchable sheet 61 is formed on the leakage prevention wall 6 in the excretion part region A so that the elastic sheet 61 has a convex shape on the skin contact surface side, and a high standing part 6A having a cavity inside is formed. Yes.

In the high upright portion 6A, as shown in FIG. 3B, the elastic region 61e has an arcuate cross section. The number of the thread-like or string-like elastic members 64 arranged in the elastic region 61e can be, for example, about 3 to 30, preferably about 4 to 20, and more preferably about 5 to 10. In the napkin 1, as shown in FIG. 2, the high upright part 6 </ b> A is formed from the excretion part region A to a part of the rear part C (part relatively close to the liquid disposition area A in the rear part C). ing.
A gap S is formed between the side edge 4a and the elastic sheet 61 by forming the outer fixed end 61g outward from the side edge 4a of the absorber 4 and being separated from the side edge 4a. Therefore, it is possible to effectively prevent the liquid absorbed by the absorber 4 from leaking out from the side edge 4a to the stretchable sheet 61.

  Further, as shown in FIG. 3B, the leak-proof wall 6 (high upright portion 6A) in the excretion region A has folding portions E1 and E2 that enter the inside of the cavity and bend to the outside of the cavity. . The folding portion E2 is formed at a substantially middle position between the upper end portion and the lower end portion (outer fixing portion 61e) of the leak-proof wall 6, and the inner folding portion E1 and the outer side in the width direction by the fixing portion at the center side in the width direction. Due to the outward folding portion E2, the leak-proof wall 6 has an Ω shape. The fixing portion on the center side in the width direction is stabilized by the elastic sheet 6 being placed on the non-skin contact surface side of the top sheet 2 and bonded, and mainly by this, the inward folding portion E1 is fixed. The shape is stabilized. The outward folding part E2 is stabilized by a suppressing part that shortens the heights of the front and rear leak-proof walls, which will be described later. By forming the Ω-shaped cavity in this way, it has a fitting property to the body due to the deformation of the cavity (collapse of the cavity), and a leakage preventing property by preventing the lower surface contact by the height of the leakage preventing wall and the folding portion. The fold-in part refers to the bent part of the Ω-shaped cavity, and the collapsed part of the cavity shape deformation (collapse of the cavity) is stable. . If the crushing part is not determined, it will be bent at various parts, and the loop shape at the time of restoration will be distorted, the fitting property will be hindered, and leakage will easily occur.

As shown in FIGS. 2 and 3, each leak-proof wall 6 has cavities in front and rear of the excretion region A in the longitudinal direction of the napkin 1, but the cross-sectional shape in the width direction is a highly upright portion 6 </ b> A. Unlike the high upright portion 6A, the low upright portions 6B and 6C are lower than the high upright portion 6A. In the longitudinal direction of the napkin 1, the low upright portions 6B and 6C are formed in a region where the stretchable sheet 61 constituting the leak-proof wall 6 exhibits stretchability.
The low upright portions 6B and 6C of each leakage barrier 6 have a height lower than that of the high upright portion 6A by the height suppressing means. The heights H of the high upright portions 6A and the low upright portions 6B and 6C are the heights H (see FIG. 3) from the liquid absorption surface adjacent to each leakage barrier 6 respectively.

The height restraining means in the low standing part 6B of the front part is a joining means 65 that partially joins the inside of the Ω-shaped cavity of the leak-proof wall 6 (the inner walls of the cavities formed inside the leak-proof wall). is there. As the joining means 65, various known joining means can be employed. For example, an adhesive such as a hot-melt adhesive or a heat seal is preferably used. From the viewpoint of keeping the leak-proof wall 6 flexible, an adhesive is preferable.
The height restraining means in the rear low standing part 6 </ b> C is joining means 66 and 67 for joining the lower outer surface of the Ω-shaped cavity part of the leak-proof wall 6 to other parts. One joining means 66 joins the outer surfaces of the leak-proof wall 6, and the other joining means 67 joins the outer surface of the leak-proof wall 6 and the absorbent main body 5 (specifically, the surface sheet 2). ing. As the joining means 66 and 67, the same thing as the joining means 65 can be used.

  When the inner walls of the cavity are joined to each other and the height is restrained like the low standing portion 6B, the height can be restrained while suppressing the deterioration of the expansion and contraction characteristics, and thus the absorbent article can be easily conformed to the body shape. It is possible to form a pocket portion between the top sheet 2 and the leak-proof wall 6. Therefore, the low upright portion 6B that suppresses the height as described above is suitable for a portion where the curvature change is large, that is, the front portion A. On the other hand, if the height is suppressed by joining the lower outer surface of the cavity part to the other as in the low standing part 6C, the height can be suppressed while leaving the cavity, so that the leakproof wall has a high fit. High trackability in movement. Moreover, even if the cavity is once crushed at the time of wearing, it can be restored to the original cavity, maintain the standing erection part, follow the wearer's inseam shape well together with the high erection part, and further contribute to leakage prevention.

  In addition, since the folding part is fixed by forming the height restraining part of the front part and the rear part, the folding part shape in the excretion part region is stabilized, and the Ω-shaped cavity is formed by separating the folding parts from each other. It also has the effect of making the part difficult to fall.

  Furthermore, the Ω shape makes it easy to recognize the leak-proof wall 6 and realize a leak-inhibiting effect, and even if the cavity is crushed and contacted with a surface sheet wet with liquid, the leak-proof wall 6 is soiled. It has a function that is difficult to recognize and difficult to cause dirt. In the conventional hollowing, the height of the leak-proof wall joined to the top sheet was continuously changed, so it was difficult for the user to recognize the existence of the leak-proof wall. It is easy to distinguish the sheet 2 and to give a sense of security. In addition, even if the cavity collapses due to pressure during use and the leak-proof wall directly contacts the surface sheet, the contacting surface is the non-use surface side, not only the dirt is not visible, but the cavity is not completely collapsed, In particular, since the cavities tend to remain on the protruding portions on both sides of the cavities, it is difficult for the leak-proof walls to be contaminated by the liquid oozing between the skin and the leak-proof walls.

  When the inner walls of the cavity are joined to form a height suppressing means, the joining by the joining means 65 is expanded and contracted at a portion protruding in the width direction of the leak-proof wall 6 as shown in FIG. It is performed so that the parts 66 and 66 where the mutually facing surfaces of the adhesive sheet 61 are not joined to each other are generated, while suppressing the height of the low standing part 6B, the inner folding part E1 and the outside of the high standing part 6A As a result of stabilization of the shape of the inner fold portion E1 and the outer fold portion E2 that are separated in the width direction in the high upright portion 6A, the leakage preventing wall that the side fold portion E2 comes into contact and does not easily fall in the width direction is obtained. This is preferable from the viewpoint of forming a curved loop shape having flexible deformability.

As the top sheet 2, the back sheet 3 and the absorbent body 4 in the sanitary napkin 1, conventionally known materials and the like can be used without particular limitation.
As the top sheet, a material having a structure that is difficult to hold the liquid, for example, a perforated film having a three-dimensional liquid introduction pipe or a non-woven perforated structure having a concavo-convex structure is preferable. A film made of a resin material is preferable. In addition, pulp, a mixture of superabsorbent polymer, and a polymer sheet can be used for the absorber, and it is also preferable to arrange an intermediate sheet made of a nonwoven fabric that enhances liquid return prevention properties on the upper surface of the absorber.

  A first adhesive portion for fixing the main body and a second adhesive portion for fixing the wing portion are formed on the non-skin contact surface side of the back sheet 3. That is, a first adhesive portion (not shown) that fixes the absorbent main body 5 to clothes such as underwear is formed in the arrangement region of the absorber 4 on the outer surface of the back sheet 3 (region overlapping the absorber 4). A second adhesive portion (not shown) is formed on the surface of the wing portion 7 on the back sheet 3 side.

  In the napkin 1 of the first embodiment, as described above, the elastic member 64 is stretched between the two substantially non-extensible sheets 62 and 63 as the stretchable sheet 6 for forming the leak-proof wall. Although the fixed composite sheet is used, various elastic sheets can be used instead. That is, the stretchable sheet in the present invention is not particularly limited as long as it is sheet-like and has stretchability. However, it is preferable that the liquid is hardly permeable from the viewpoint of leakage prevention effect. The liquid impermeability here includes liquid impermeability.

  Examples of the sheet material that can be used as the elastic sheet include an elastic film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof. Specifically, the material itself made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene-α olefin copolymer such as ethyl acrylate-ethylene, etc. has a stretchable material. (Films, filaments, nonwoven fabrics, woven fabrics) and laminates of these stretchable materials (elastic members) and nonwoven fabrics. When used on the skin contact surface side of the top sheet, the stretchable film is made of polyethylene / polyester, polyethylene to improve the touch and to improve heat sealability and fixability with an adhesive. / Laminated with thermoplastic nonwoven fabric made of polypropylene or polypropylene, and preferably used as a laminate. Such a thermoplastic nonwoven fabric preferably uses crimped fibers so that the nonwoven fabric itself has stretchability. In the case of laminating a non-crimped nonwoven fabric that is difficult to stretch, an elastic member is preliminarily formed before lamination. Alternatively, the sheet material may be stretched to a predetermined stretch ratio and bonded to the nonwoven fabric material by hot melt, heat seal, or the like to form a sheet material that exhibits stretchability.

  In addition, the stretch behavior of the stretch sheet does not have to be the same in any part. From the viewpoint of the shape stability of the leak-proof wall and the combination with other components, the stretch does not vary or does not stretch Is preferably formed. Specifically, stretchability is required from the Ω-shaped overhanging portion of the leak-proof wall to the upper end, and the elastic function is imparted or elasticized so that the stretchability is expressed in the vicinity of the folded portion to stabilize the folded shape. Fixing property and flexibility can be improved by disposing a member and not exhibiting an expansion / contraction function or an elastic member at the fixing portion or the width direction extending portion.

  Next, the sanitary napkin of 2nd Embodiment which has a side cross section shown by FIG. 4 is demonstrated. About the sanitary napkin of 2nd Embodiment, a different point from the sanitary napkin 1 mentioned above is demonstrated, and description is abbreviate | omitted about the same point. For the points that are not particularly described, the above description of the sanitary napkin 1 is appropriately applied.

  In the sanitary napkin of the second embodiment, a stretchable sheet 6 for forming a leak-proof wall is disposed and fixed on the upper surface of the topsheet 2. Further, the top sheet 2 protrudes outward in the width direction from the side edge 4a of the absorbent body 4 so that the folded portion E2 is easily formed. Therefore, the clearance gap S is formed between the absorber 4 and the elastic sheet 6, and it is easy to stabilize the folding part E2. The length L [see FIG. 4 (b)] that the top sheet 2 extends from the side edge 4a of the absorber 4 is preferably 2 to 10 mm, particularly 3 to 5 mm. Furthermore, since the central side portion of the stretchable sheet 61 in the napkin width direction is positioned on the upper surface of the topsheet 2, the Ω-shaped projecting portion lower portion 69 due to crushing of the cavity does not directly contact the topsheet 2, In particular, in the excretion part region A, it is easy to prevent the liquid leakage of the leak-proof wall.

  Next, the sanitary napkin of the third embodiment having the side cross section shown in FIG. 5 will be described. About the sanitary napkin of 3rd Embodiment, a different point from the sanitary napkin 1 mentioned above is demonstrated, and description is abbreviate | omitted about the same point. For the points that are not particularly described, the above description of the sanitary napkin 1 is appropriately applied.

In the sanitary napkin of the third embodiment, the stretchable sheet 61 is disposed on the upper surface side of the topsheet 2, and both ends of the stretchable sheet deformed into an Ω shape are fixed to the topsheet 2. Therefore, compared to the case where the outer end of the Ω shape is fixed on or more outward from the absorber, the synthetic resin is less deformed by the liquid due to the deformation of the Ω shape against the deformation due to liquid absorption during use of the absorber. It is difficult to prevent by being fixed to the surface sheet which consists of material.
Also in the third embodiment, the space between the inner fixed end 61d and the outer fixed end 61f of the stretchable sheet 61 is deformed into a loop shape to form a high upright portion 6A having an internal cavity.

In addition, in the sanitary napkin of 3rd Embodiment, as shown to Fig.5 (a) and FIG.5 (c), fixation by the heat seal 71 is carried out on the outer side of the napkin 1 width direction in the leak-proof wall 6. FIG. Furthermore, the cross-sectional shape of the leak-proof wall 6 in the high upright portion 6A is shown in FIG. 5B by fixing the outer side of the napkin on the excretory portion region A side from the longitudinal end of the napkin. ), The outward projecting portion 6D can be shaped to project larger than the inward projecting portion 6E. Therefore, it is possible to make the absorption surface wide so that the leak-proof wall can be easily prevented from being soiled. Moreover, since it is easy to form an overhang | projection part beyond the side edge part of an absorber, the level | step difference feeling of an absorber edge part and an extension part can be relieve | moderated.
In addition, it may replace with a surface sheet and may form the same structure similarly using the intermediate sheet with a material with little deformation | transformation by a liquid.

  Next, a sanitary napkin according to a fourth embodiment having the side cross section shown in FIG. 6 will be described. About the sanitary napkin of 4th Embodiment, a different point from the sanitary napkin 1 mentioned above is demonstrated, and description is abbreviate | omitted about the same point. For the points that are not particularly described, the above description of the sanitary napkin 1 is appropriately applied.

  In the sanitary napkin of the fourth embodiment, the height of the low standing part 6B at the front part and the low standing part 6C at the rear part are the same as those of the low standing part 6C at the rear part in the first embodiment. It is suppressed. As a result, fit and flexibility due to the deformation of the cavity can be realized in the entire leak-proof wall.

As mentioned above, although this invention was demonstrated based on the preferable some embodiment, this invention is not restrict | limited to embodiment mentioned above.
For example, the low upright part may be formed only on either the front side or the rear side of the excretion part region. In addition, when a composite sheet in which the elastic member 64 is fixed in an extended state between two substantially non-extensible sheets 62, 63 is used as the stretchable sheet, the composite sheet is as shown in FIG. In addition, the portion other than the elastic region 61 e where the plurality of elastic members 64 are arranged may be composed of only one sheet 63. One or both of the sheets 62 and 63 may be made of a sheet material other than the nonwoven fabric, for example, a resin film.
FIG. 1 shows the absorbent body 4 in which a small upper absorbent layer 41 for forming a middle and high part is laminated on a lower absorbent layer 42. A uniform absorber may be used.
In addition, the description omitted in one embodiment and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately applied between the embodiments. Can be substituted for each other.

  The absorbent article according to the present invention may be an incontinence pad, a panty liner, a disposable diaper or the like in addition to a sanitary napkin.

FIG. 1 is a perspective view showing the sanitary napkin according to the first embodiment of the present invention virtually cut in the excretion region. FIG. 2 is a plan view showing the skin contact surface side (surface sheet side) of the sanitary napkin according to the first embodiment, and is a view showing an extended state where the leak-proof wall is not raised. Drawing 3 is a mimetic diagram showing the section of the napkin side part of the state where the sanitary napkin of a 1st embodiment curved, (a) II line sectional view, (b) II-II line sectional view, (C) It is III-III sectional view taken on the line. FIG. 4 is a view corresponding to FIG. 3 of the second embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 3 of the third embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 3 of the fourth embodiment of the present invention. FIG. 7 is a cross-sectional view showing another example of the stretchable sheet used in the present invention.

Explanation of symbols

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 4a Absorber side edge 5 Absorbent main body 6 Leakage barrier 6A High standing part 6B Low standing part 6C Front low standing part 61 Elastic sheet E1, E2 Folding part A Excretion Part area B front part C high part

Claims (6)

Absorbency having a top sheet, a back sheet, and a substantially vertically long absorbent main body having an absorbent body interposed between both sheets, and a pair of leak-proof walls formed on both sides in the longitudinal direction of the absorbent main body In goods,
The leak-proof wall is formed in the excretion part region disposed opposite to the wearer's liquid excretion part in the longitudinal direction of the absorbent article, and the elastic sheet has a convex shape on the skin contact surface side, and a cavity is formed inside. It has a high erection part, and has a cavity in the front and / or rear of the excretion part region, but the cross-sectional shape in the width direction is different from the high erection part and the height is lower than the high erection part. Absorbent article characterized by having a part.   The absorbent article according to claim 1, wherein a part of the leak-proof wall has a folded portion.   The absorbent article according to claim 1, wherein the low standing part has a lower height than the high standing part by partially joining inner walls of the cavity.   The low upright portion has a height lower than that of the high upright portion by joining the outer surfaces of the leak-proof walls or the outer surface of the leak-proof wall and the absorbent main body. 2. The absorbent article according to 2.   The low standing part is formed at each of the front and rear of the excretory part region, and the front low standing part and the rear low standing part have different heights from the high standing part by means different from each other. The absorbent article in any one of Claims 1-4 made low.   The high standing part has an inner folding part and an outer folding part formed respectively on the inner side and the outer side of the absorbent article, and the inner folding part and the outer folding part are separated in the width direction. The absorbent article according to any one of claims 1 to 5.

Images