JP5099770B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin, an incontinence pad, and a panty liner provided with an elastic stretchable part that comes into contact with a wearer's skin.

  2. Description of the Related Art Conventionally, in absorbent articles such as sanitary napkins equipped with a three-dimensional gather, a three-dimensional gather having an elastic stretchable part that comes into contact with the skin of the wearer when worn is known. However, the conventional one does not always have a good touch on the skin of the wearer of the three-dimensional gather. For example, there were many things which were inferior and were inferior to the touch and cushioning property by irregular wrinkles. In addition, the conventional one does not stably hold the shape of the elastic stretchable part, and the elastic stretchable part shrinks in an undesired direction during use, and the effect of improving fit and leakage prevention properties is not obtained. There was a fear.

  For this reason, Japanese Patent Application Laid-Open No. 2001-291895 (Patent Document 1) attempts to improve the touch by forming convex portions extending in the width direction so as not to generate wrinkles and using the convex portions as cavities. Has been proposed. Furthermore, the surface shape is stabilized by the convex part extended in the width direction. However, in the case of a three-dimensional gather having a surface shape, it is difficult to obtain sufficient fit unless the gather is raised, but if the standing property is increased, the absorbent body tends to fall down, and gather dirt is likely to be induced.

  On the other hand, a sheet-like elastic member is arranged on both sides of an absorbent article so that the cross section in the width direction has an arch shape, and a leak-proof wall having high flexibility and leak-proof properties is formed (Japanese Patent Laid-Open No. 11-19123) Document 2) 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. In addition, when a leak-proof wall having an arch-shaped cross section is formed on both sides of the absorbent article, it has good fit and a shape in which both ends of the leak-proof wall are fixed. Even if it is received, it is difficult to protrude from the fixed ends, 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.

JP 2002-291895 A Japanese Patent Laid-Open No. 11-19123

  In recent years, as the length of the absorbent article becomes longer, the leak-proof wall tends to become longer. In the technique of Patent Document 2, in order to make the fit and leak-proof characteristics that are the features effective, Standing stability is required, but because it is continuously fixed to the top sheet, the shape of the gathers cannot be stabilized at the center of the absorbent article, providing sufficient fit, flexibility, and leakproofness. It is difficult to get.

  Accordingly, an object of the present invention is to provide an absorbent article that is excellent in fit, flexibility and liquid leakage prevention.

  The present invention includes a substantially longitudinal absorbent body having a top sheet, a back sheet, and an absorbent body interposed between the two sheets, and a pair of leak-proof walls formed on both sides in the longitudinal direction of the absorbent body. In the absorbent article having the above, the leak-proof wall is formed by a belt-like stretchable sheet formed of a sheet material and an elastic member being raised and raised on the skin contact surface side, and is formed inside. The sheet material of the stretchable sheet has a hollow, and has a fine convex structure extending in the longitudinal direction of the leak-proof wall, or a convex structure comprising a large number of convex parts in series in the longitudinal direction of the leak-proof wall. The object is achieved by providing an absorbent article in which is formed.

  The absorbent article of this invention can suppress that a liquid moves to the width direction between skin and a leak-proof wall, and the outstanding liquid-leakage prevention property is obtained. Moreover, the convex shape of the leak-proof wall is easy to be stabilized, and it has a stable fit without feeling uncomfortable even during wearing.

  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 cross-sectional view showing a cross section of the side portion of the excretory part region in the napkin in a curved state.

  As shown in FIG. 1, the napkin 1 of the first embodiment (hereinafter also simply referred to as the napkin 1) includes a top sheet 2 located on the skin contact surface side, a back sheet 3 located on the non-skin contact surface side, And a longitudinally 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 of the absorbent main body 5 in the longitudinal direction. is doing. 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 a side edge in the longitudinal direction of the absorbent body 4. It extends outward in the width direction from 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 absorber 4. Each of the stretchable sheet 61 and the back sheet 3 extends outward from the outer peripheral edge of the absorbent body 4, and the outer periphery (vertically long rectangular shape) of the napkin 1 is formed by the extended outer peripheral edges of the sheets 3 and 6. It is. The two 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 part 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 prevents fixation with an adhesive and is formed is formed.

  In this specification, the “longitudinal direction” is a direction along the longitudinal direction of the absorbent article or the absorbent main 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 of the first embodiment, a groove 14 along the longitudinal direction of the sanitary napkin 1 is formed by embossing.

  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 FIG. 4, the 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, stretchable sheets 61 and 61 are disposed on both sides of the sanitary napkin 1 on the skin contact surface side of the absorbent body 4 constituting a part of the absorbent main body 5, and stretchable. Due to the contraction of the adhesive sheets 61, 61, convex curved surface shapes that extend in the longitudinal direction of the sanitary napkin 1 on both sides of the sanitary napkin 1 and whose cross-sectional shape in the width direction is a convex arc shape on the skin contact surface side. The leakage prevention walls 6 and 6 which have a cavity inside are formed in the three-dimensional form. The pair of stretchable sheets 61 and 61 are fixed at both side edges in a state where the pair of stretchable sheets 61 and 61 are stretched in the longitudinal direction of the sanitary napkin 1. Each stretchable sheet 61 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 connected to end seal portions 9 and 9 formed at both end portions in the longitudinal direction of the napkin 1. It is fixed.

  As shown in FIG. 3, the stretchable sheet 61 used in the first embodiment is formed by sheet materials 62 and 63 and an elastic member 64. The leak-proof wall 6 is formed by the elastic sheet 61 being raised and raised on the skin contact surface side, and a cavity is formed inside the leak-proof wall 6. As shown in FIG. 3, each stretchable sheet 61 in the excretion region A is a surface on the skin contact surface side of the absorbent body 4 with a portion having a predetermined width from the one side edge 61 a on the width direction center portion side of the napkin 1. It is fixed on the top. 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 joined to the topsheet 2 with an adhesive (not shown). 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. The elastic sheet 61 stands up in 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 shown in FIG. is doing.

In the leak-proof walls 6 and 6 in the excretion part area | region A, the inward extending part 6N which the elastic sheet 61 protruded inward in the napkin width direction from 61d of inner side fixed ends, and the width direction outward from 61g of outer side fixed ends It has an Ω-shaped cross-sectional shape having an outwardly projecting portion 6G that projects to the surface. The stretchable sheet 61 is composed of sheet materials 62 and 63 and a plurality of thread-like elastic members 64, and a plurality of fine convex portions (convex structures) 68 in which the thread-like elastic members 61 are inserted are formed on the sheet material 62. Yes. Each convex portion 68 extends in the longitudinal direction of the leak-proof wall 6. The sheet materials 62 and 63 are made of a hydrophobic nonwoven fabric. By the fine protrusions (convex structure) 68 extending in the longitudinal direction, the leak-proof wall 6 can be improved in the stability of the Ω shape, the standing property of the leak-proof wall, the prevention of liquid leakage from the leak-proof wall, and the like.
The reason why the stability of the Ω shape is improved is that the occurrence of wrinkles or the like may be suppressed as a result of the formation of irregularities on the sheet material itself, but as shown in FIG. The sheets 62 and 63 are directly fixed by hot melt without passing through the elastic member 64, the shape of the sheet material 63 on the cavity side is easy to be stabilized, and the fixing of the two sheet materials 62 and 63 is the expansion and contraction of the elastic member. The point is that it is less affected.

  The standing property of the leak-proof wall has an effect on the stretchability of the elastic member arranged on the convex part, in addition to the stabilization of the Ω shape itself by the uneven shape extending in the longitudinal direction. It is easy to take a configuration that is difficult to give. Specifically, the adhesive is usually applied directly to the elastic member and fixed to the sheet material, but since the elastic member is arranged on the convex part, the movement of the elastic member is suppressed by the convex part shape. Because it is possible to form a stretchable sheet without applying a minimum amount of adhesive to the stretch-expressing part or without applying an adhesive to the elastic member, Can be expressed. As another configuration that hardly affects the stretchability, there is a stretchable sheet that uses a sheet material having stretchability and is not stretched.

  The leakage of the leak-proof wall is noticeable in a three-dimensional gather having a flat portion, but is a phenomenon in which the liquid spreads through a minute gap between the skin and the gather, and is a phenomenon different from the seepage of the leak-proof wall. It is not a leak that leaks out of the leak-proof wall like a ooze, but the leak-proof wall gets dirty, so if the liquid bleeds, the user can easily feel that it has leaked and the liquid also adheres to the body easy. There are various causes of liquid bleed, but it is judged that there are two main factors: liquid adhesion on the leak-proof wall due to the fall of three-dimensional gathering and liquid adhesion on the body. The Ω-shaped leak-proof wall has a protruding shape, so that it does not easily fall down in the width direction, and the upper surface side does not directly contact the absorbing surface with the protruding portion as a boundary even if the ohmic cavity collapses. Easy to prevent liquid bleeding. Furthermore, since the convex portion is formed, the liquid hardly spreads in the width direction even when it is in contact with the skin on the upper surface side, and there is little contact with the absorbing surface on the lower surface side.

  Moreover, since a convex part contacts a skin partially, it also has the effect which improves the touch.

  The shape of the leak-proof wall can be stabilized by the Ω shape and the convex shape of the leak-proof wall, but the cross-sectional shape of the leak-proof wall and the stretchable sheet 61 in the front and rear parts of the absorbent article can be stabilized. The shape of the leak-proof wall can be further stabilized by devising the fixing.

  For example, the elastic sheet 61 is formed by processing one sheet material 62 into a cross-sectional zigzag shape or a continuous wave shape, and then introducing an elastic member 64 pre-applied with an adhesive into the trough, and then the trough Can be manufactured by joining the other sheet material 63 so as to cover. The valley portion where the elastic member 64 is introduced forms a convex portion 68 in the leak-proof wall 6. The elastic member 64 can also be introduced without previously applying an adhesive.

The number of convex portions (convex structures) 68 formed on each leak-proof wall 6 can be, for example, about 3 to 10, and an odd number in which the elastic member 64 is arranged on the top is preferable, and about 5 to 7 are provided. Is more preferable.
In the napkin 1 shown in FIG.1 and FIG.2, in the range shown by 6A in FIG. 2 ranging from the excretion part area | region A to a part of back part C (part comparatively close to the liquid arrangement | positioning area A in the back part C). The cross-sectional shape is substantially the same as that of the excretion region A.

In order to improve the stability of the Ω shape of the leak-proof wall, as shown in FIG. 3, it is effective to form the folds E1 and E2 between the fixed portions at both ends and the upper end of the leak-proof wall, FIG. 4 shows the leak-proof wall shapes of the height suppression portions 6B and 6C formed in the front part B and the rear part C in order to stabilize the folding parts E1 and E2.
As shown in FIG. 3, the leak-proof walls 6 and 6 in the excretion area A form folds E1 and E2 that enter the inside of the cavity and bend to the outside of the cavity. The folded portion is formed at a substantially middle position between the upper end portion and the lower end portion (fixed portion) of the leak-proof wall 6, and is formed into an Ω shape by the inner folded portion E1 and the outer folded portion E2 formed by the fixed portion at the center in the width direction. It is said that. The fixing portion on the center side in the width direction is joined by arranging the elastic sheet 61 on the non-skin contact surface side of the surface sheet, so that the shape of the inward folding portion is stabilized, and the outward folding portion E2 is stabilized by a suppressing portion that shortens the heights of the leakage preventing walls at the front and rear portions, 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 leak-proof wall 6 in 1st Embodiment has the folding parts E1 and E2 into which the part of this leak-proof wall 6 entered the inner side of the cavity from the outer side or the inner side of the width direction of this leak-proof wall. . And the convex structure 68a (68) is formed also in the surface which faced the downward direction of the folding parts E1 and E2. Since the convex structure 68a (68) is also present on the surface facing the lower side of the folding parts E1 and E2, the standing property of the leak-proof wall is improved, and the outer absorber and the lower part of the outer folding part E2 are provided. The gap between the side part of the absorbent body and the leak-proof wall that is formed is maintained well. Moreover, even if the lower part of a leak-proof wall contacts the surface sheet 2 at the width direction center side, there is little adhesion of the liquid to a leak-proof wall, and it is easy to prevent the dirt of a leak-proof wall and the liquid leak developed from there. .

On the other hand, in the height suppression parts 6B and 6C formed in the front part B and the rear part C of the leak-proof wall 6, the height of the leak-proof wall 6 is suppressed from the excretion part area | region.
The height restraining means in the height restraining part 6B of the front part is a joining means 65 for partially joining 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). It is. 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 height restraining part 6C at the rear part 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.
The height H of the leak-proof wall 6 is the height H from the liquid absorption surface adjacent to the leak-proof wall 6 (see FIGS. 3 and 4).

  If the height is suppressed by joining the insides of the cavities as in the height suppressing portion 6B, the height can be suppressed while suppressing a decrease in the expansion and contraction characteristics, so that the absorbent article can easily follow the body shape. It is possible to form a pocket portion between the top sheet and the leak-proof wall. Therefore, suppressing the height in this way is suitable for a portion having a large curvature change, that is, a front portion. On the other hand, if the height is suppressed by joining to the lower outer surface of the cavity portion like the height suppressing portion 6C, the height can be suppressed while leaving the cavity, so that the leakproof wall has high fit and movement. High followability in

  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.

  Next, the stabilization of the convex shape will be described. It is important for the convex shape that the convex shape is maintained at the height suppressing portions 6B and 6C in the front portion and the rear portion, particularly on the upper surface side from the protruding portion. Furthermore, it is important to fix the stretchable sheet and the absorbent main body at the front and rear ends of the absorbent article in which the elastic member is not disposed or the elastic member does not exhibit its elastic function.

  In the height suppressing portions 6B and 6C, the folding fixing for suppressing the height is formed by a hot melt adhesive. However, in order to improve the formation of the convex portion, the convex shape is flattened by folding and fixing. It is necessary not to make it. In particular, the upper surface side from the overhanging portion is important from the viewpoint of stabilization of the leak-proof wall shape by the convex portion and prevention of liquid bleeding. When the fold fixing is formed on the lower surface side of the overhanging portion as in the rear portion, there is no influence on the upper surface side, but it is preferable that the fold fixing is not strongly performed when the cavity is crushed as in the front portion.

  In the longitudinal direction end portions of the front part and the rear part, the height of which is suppressed by folding and fixing, the elastic member is usually not arranged, or the elastic function is not exhibited even if it is arranged. In the sanitary napkin of the present embodiment, it is preferable that not all of the stretchable sheet (leak barrier) be fixed to the absorbent main body in order to stabilize the Ω shape and the convex shape. That is, it is preferable that the lower surface side of the Ω-shaped overhanging portion is fixed to the absorbent main body so that there is no sense of incongruity during use, but the upper surface side of the overhanging portion is fixed to the two sheet materials and the elastic member. Even if it is, it is preferable that there is no other fixation.

As the top sheet 2, the back sheet 3 and the absorbent body 4 of the sanitary napkin 1 in the first embodiment, 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, and the back sheet is made of polyethylene or the like. 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 stretchable sheet for forming a leak-proof wall is composed of two sheet materials 62 and 63 that are hydrophobic nonwoven fabrics and a plurality of thread-like elastic members 64. However, instead of this, the other stretchable sheet can be used.
That is, a belt-like stretchable sheet formed of a sheet material and an elastic member can be used without particular limitation.

  For example, examples of the sheet material include stretchable films, nonwoven fabrics, woven fabrics, and laminated sheets 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 non-woven fabric preferably uses crimped fibers so that the non-woven fabric itself is stretchable. When laminating a non-crimped non-crimped non-woven fabric, an elastic member is used before laminating. 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 is demonstrated. The sanitary napkin of 2nd Embodiment has the leak-proof wall 6 'of the structure shown in FIG. 5 in the both sides of the longitudinal direction of an absorptive main body. 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.

  The stretchable sheet 61 ′ constituting the leak-proof wall 6 ′ in the sanitary napkin of the second embodiment is made of a sheet material 62 ′ made of a nonwoven fabric, an elastic member 64 ′, and an adhesive material for fixing the elastic member. The adhesive material covers a hot-melt adhesive (not shown) having a high adhesive property applied directly to the elastic member to fix the sheet material 62 'and the elastic member 64' and the hot-melt adhesive material. The cover material 69 is non-adhesive at room temperature (which covers the elastic member as a result). Furthermore, the cover material 69 only partially covers the sheet material.

  There are many constituent materials of the elastic sheet around the elastic member 64 ′ and the elastic member having the adhesive material, and the elastic sheets are arranged so that regions having different rigidity extend in the longitudinal direction. For this reason, from the point of being composed of regions with different rigidity and basically composed of a single sheet material, the region with less material is prevented if the leak-proof wall is in the form of Ω-like projections on the skin contact surface side. It becomes easy to protrude to the outer surface side of the leak wall. Since the protrusion of the sheet material to the cavity side from the elastic member is hindered by the adhesive material, the degree of protrusion differs depending on the part, but the convex portion protruding substantially in the longitudinal direction is formed by a region with less material.

In the leak-proof wall 6 ′ in the second embodiment, a convex material comprising a plurality of convex parts 68b in series in the longitudinal direction of the leak-proof wall 6 ′ is formed on the sheet material 62 ′ of the elastic sheet 61 ′ for forming the leak-proof wall. A structure 68 'is formed. As shown in FIG. 6, a plurality of elastic members 64 ′ are joined and fixed to the sheet material 62 ′ constituting the stretchable sheet 61 ′ along the longitudinal direction of the leak-proof wall. placement site of the 'elastic members 64 in the width direction of the' forms a valley, between the elastic member 64 'adjacent to each other, a number of protrusions 68 b are formed in series state. A large number of protrusions 68b protrude from the position of the elastic member 64 ′ toward the outer surface direction P of the leak-proof wall 6 ′. The number of convex structures 68 ′ formed on each leakage barrier 6 ′ can be, for example, about 3 to 20, preferably about 5 to 13, and more preferably about 7 to 11.

  The leak-proof wall 6 ′ in the second embodiment is flexible because the convex portion (convex structure) 68 ′ is only the sheet material 62 ′, and the liquid bleeding property is further reduced by the convex portion whose height changes randomly. it can.

As mentioned above, about the sanitary napkin of 1st and 2nd embodiment of this invention, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, the height suppression site may be formed only on either the front side or the rear side of the excretion region. In addition, the folding part has only the folding part that enters the inside of the cavity from the outside in the width direction of the leak-proof wall or only the folding part that enters the inside of the cavity from the inside in the width direction of the leak-proof wall. May be.
Moreover, it can replace with the elastic sheet 61, and can also use the thing of the same structure as the elastic sheet 61 except not having the sheet | seat 63. FIG. In addition, the elastic member 64 in the convex structure can be configured not to be joined to the sheet materials 62 and 63 in the excretion region A. In that case, the elastic member 64 is preferably joined to the sheet material 62 and / or 63 at the front and rear of the excretory part region A in the longitudinal direction of the absorbent main body, for example, at the front and rear end portions of the absorbent main body 5. .
In addition, 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 the lower absorbent layer 42. However, the absorbent body and thickness of a single absorbent layer are shown. You may use a uniform absorber in the substantially whole area.
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. FIG. 3 is a schematic view showing a cross section of the side part of the sanitary napkin according to the first embodiment in a curved state, and is a cross-sectional view taken along the line II in FIG. 3A and 3B are schematic views showing a cross-section of the side portion of the sanitary napkin according to the first embodiment in a curved state, wherein FIG. 3A is a cross-sectional view taken along the line II-II in FIG. 2, and FIG. It is III-III sectional view taken on the line. FIG. 5 is a perspective view showing a leak-proof wall of the sanitary napkin according to the second embodiment of the present invention. 6 is an enlarged perspective view showing a part of the vicinity of the top of the leak-proof wall shown in FIG.

Explanation of symbols

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 4a Absorber side edge 5 Absorbent body 6, 6 'Leakage barrier 6B, 6C Height restraint part 61, 61' Stretch sheet 62, 63, 62 'Sheet material 64 Elasticity Member 68 Fine convex structure 68 'extending in the longitudinal direction of the leak-proof wall Convex structure E1, E2 composed of a large number of convex parts in series in the longitudinal direction of the leak-proof wall Folding part A Excretion part region B Front part C Rear part

Claims (4)

Topsheet, a longitudinal length absorbent body having an absorbent body interposed between the backsheet and the two sheets, in the absorbent article having a pair of leakage preventing walls formed on both sides in the longitudinal direction of the said absorbent body ,
The leak-proof wall is formed by a belt-like stretchable sheet formed by a sheet material and an elastic member being raised on the skin contact surface side, and has a cavity inside,
Wherein the sheet material of the stretchable sheet, the convex structure Ru longitudinally extending leakage preventing walls, or the and convex structure comprising a plurality of convex portions in series in the longitudinal direction of the leakage preventing walls are formed,
The leak-proof wall has a fold-in part of the leak-proof wall,
The convex structure formed in the sheet material is formed on the surface facing the lower side of the folding part, and protrudes to the outer surface side of the leak-proof wall,
The said convex structure formed in the said sheet material is an absorbent article currently formed in the excretion part area | region in the longitudinal direction of an absorbent article, and the area | region ranging from this excretion part area | region to a part of back part . The convex structure, the is convex structure extending in the longitudinal direction of the leakage preventing walls, the absorbent article according to claim 1, wherein said elastic member to said convex structure is fixed. The convex structure is composed of a large number of convex portions in series in the longitudinal direction of the leak-proof wall, and the convex structure is formed from a region of low rigidity partially formed in the width direction of the stretchable sheet . The absorbent article according to claim 1 . The leakage preventing wall is at least one front and rear excretion region, any one of claims 1 to 3, the lower portion of the cavity has a height suppressing portion which is fixed to the absorbent body The absorbent article as described.

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