JP5119041B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin or an incontinence pad provided with a convex leak-proof wall 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 above-mentioned conventional ones do 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. Further, the shape of the elastic stretchable part is not stably maintained, and the elastic stretchable part may be twisted or shrunk in an undesired direction during use, so that the effect of improving the fit property and the leakage preventing property may not be obtained.

  For this reason, a sheet-like elastic member is arranged on both sides of the absorbent article so that the cross-section in the width direction is a hollow arch shape, and a leak-proof wall having high flexibility and leak-proof properties is formed. (Patent Document 1). According to this, the arch shape is deformed and fits to the shape of the wearer's body shape, and exhibits the ability to prevent lateral leakage of liquids and the like. Moreover, when a leak-proof wall having an arch-shaped cross section in the width direction is formed on both sides of the absorbent article as described above, good fit is exhibited. And since it is the shape by which the both ends of the leak-proof wall are being fixed, even if it receives a pressure during use, it is hard to protrude from the both ends fixed, and indirect dirt is suppressed. For this reason, in addition to the actual side leakage prevention property, the appearance impression which prevents side leakage is also strong.

  Moreover, what arrange | positioned the leak-proof wall of the cavity different from the thing of the patent document 1 to the both sides of the absorbent article is proposed (patent document 2). According to this technique, the shape is easily deformed according to the movement of the wearer and fits well, and the buffering force by the loop portion is high, so that it has side leakage prevention properties.

Japanese Patent Laid-Open No. 11-299821 Japanese Patent Laid-Open No. 11-19123

  In recent years, the length of absorbent articles such as sanitary napkins for night use has become increasingly longer. Accordingly, since the leak-proof wall becomes longer, it is necessary to have higher gather standing stability. For example, like the napkin disclosed in Patent Document 2, a member that forms the standing gather on the surface sheet has a constant form. In this case, the gather shape cannot be stabilized at the center of the long absorbent article, and it is considered difficult to obtain sufficient fit, flexibility, and leakproofness.

  In view of the above points, an object of the present invention is to provide an absorbent article that has high fit and flexibility and is excellent in liquid leakage prevention. Another object of the present invention is to provide an absorbent article having the above-described excellent characteristics and provided with standing gathers that can be suitably adapted to a long absorbent article such as a night napkin.

  The above-described problem of the present invention is that the absorbent main body is provided with a top sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and an absorbent body interposed between the two sheets. An absorbent article in which a stretchable sheet forming a leak-proof wall is arranged on both sides in the direction, wherein the absorbent main body has a skin center at the center in the width direction rather than the periphery in the width direction at the center in the longitudinal direction. The leak-proof walls on both sides of the absorbent main body have a natural shape, and projecting portions on both side walls bulge outward while being convex on the skin contact surface side. The stretchable sheet that stands up while holding a cavity inside is fixed to the absorbent main body at the widthwise inner lower end and the widthwise outer lower end in the widthwise cross section of the stretchable sheet. The cross section in the width direction of each of the standing leakage barriers is from the skin contact surface side upper end. It was solved by the absorbent article which is folded portions entering the cavity side of the interior of the leakage preventing walls between the serial width outward lower end.

  The absorbent article of the present invention prevents excessive bending of the absorbent main body due to the formation of the leak-proof wall and separation of the absorbent main body from the body, and does not give a strong sense of incongruity during wearing due to appropriate flexibility. It exhibits a stable fit and has an excellent effect of making it difficult to cause liquid leakage. In addition, it is easy to visually recognize flexibility and liquid leakage prevention. Furthermore, the above-mentioned excellent functions can be suitably applied to a long night napkin or the like.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. FIG. 1 is a perspective view schematically showing a sanitary napkin as a preferred embodiment of the present invention with a partial cross section. FIG. 2 is an enlarged partial cross-sectional view of the sanitary napkin shown in FIG. 3 is a plan view schematically showing the whole of the sanitary napkin of FIG. 1 (the cross section shown in FIG. 1 is an enlarged view of the cross section taken along the line II in FIG. 3 in a natural shape). Equivalent to that).

As shown in FIG. 1, the napkin 10 according to the present embodiment 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 an absorption disposed between the two sheets. It has a vertically long absorbent main body 1 having a body 4. And the napkin 10 of this embodiment has the elastic sheet 7 which forms a pair of leak-proof wall 6 further extended in the longitudinal direction both sides of the absorptive main body 1. FIG. In the present invention, the leak-proof wall means a wall-like structure portion that exhibits a leak-proof property of liquid or the like at both side portions in the longitudinal direction of the absorbent article. In FIG. 1, it is the standing part (leakage prevention wall) 6 formed with the elastic sheet 7, and the area | region from the width direction inner lower end part 13a to the width direction outer lower end part 13b in the cross section especially (See FIG. 2). In addition, in this embodiment, the leak-proof wall is the leak-proof wall 6 (6a) of the front part, and the leak-proof wall 6 (6c) of the rear part with respect to the leak-proof wall 6 (6b) of the center part of the article longitudinal direction. The height is lowered (see FIGS. 3 to 5). Unless otherwise specified, the leak-proof wall refers to the leak-proof wall 6b in the center. However, when distinguishing each of the leak-proof walls, the reference numerals are changed as the leak-proof walls 6a, 6b, and 6c.
The longitudinal sides of the absorbent body to the absorbent article in the present invention, but that part is not particularly limited as long as a side than a width direction center line w _c of the absorbent body (the direction of w _a), the article It is preferable that it is on the outer side of w _b corresponding to a position of ¼ of the width in the front portion l ₂ (see FIG. 3). In the napkin 10 of the present embodiment, the absorbent body 4 is formed of two layers of an upper layer absorbent body 4a and a lower layer absorbent body 4b in the article central portion l ₃ (see FIG. 3) corresponding to the excretion region. Then, the more the width direction periphery W ₂ is higher widthwise central portion W _1, which is structured to form a domed portion 1a of the absorber (see FIGS. 1 and 2).

The surface sheet 2 is joined at an interface including the elastic sheet 7 forming the leak-proof wall 6 and the inner lower end portion 13a on the absorber upper side. The stretchable sheet 7 extends outward from the widthwise side edge 4e of the absorbent body 4 while forming the leak-proof wall 6, and is joined to the back sheet 3 at the outer lower end 13b. Thus also, the backsheet 3 extends outward from the widthwise side edges 4e of the absorbent body 4, extending portion with the stretchable sheet 7 forms a wing 18 in (flap portion) W _3.

The stretchable sheet 7 and the back sheet 3 extend from the outer peripheral edge of the absorbent body 4 in the longitudinal direction and the width direction outward, and the outer periphery of the back sheet 3 and the stretchable sheet 7 forms the outer shape of the napkin 10. The back sheet 3 and the stretchable sheet 7 are bonded and fixed to each other by a bonding means such as an adhesive or heat seal to form a peripheral seal portion 17. In the longitudinal absorption center portion l ₃ (excretion region) of the napkin 10, a wing 18 is formed to cover the crotch portion of the underwear and prevent contamination and fix with an adhesive. In the present invention, the “longitudinal direction” means a direction along the long side of the absorbent article (Y direction in FIG. 3) unless otherwise specified, and the “width direction” is a direction orthogonal to the longitudinal direction. (X direction in FIG. 3). The “skin contact surface” is a surface directed toward the wearer's skin when wearing the absorbent article, and the “non-skin contact surface” is the underwear side (wearer's skin when wearing the absorbent article) The surface is directed to the opposite side.

In the sanitary napkin 10 of the present embodiment, as shown in FIGS. 1 to 3, the groove 14 that is recessed from the skin contact surface side to the non-skin contact surface side and extends in the longitudinal direction of the sanitary napkin 10 is embossed. It is formed by processing. In the present embodiment, the groove portion 14 is formed with a depth such that the lower layer absorbent body 4b is partially recessed from the surface sheet 2 side, and both are integrated. Furthermore, longitudinal in the direction article central portion l ₃ and the longitudinal article front portion l ₂ and rear section l boundary k ₁ and k ₂ of the _4, respectively, the groove 14 formed column width inward of the plan view becomes excretion area The constricted portions 14a and 14b are formed so as to enter. As a method of forming the groove portion 14, a normal embossing technique can be used. In the present embodiment, the groove portion 14 is shown in a shape along both sides in the longitudinal direction of the absorbent main body. However, as in the present embodiment, the groove portion 14 may be formed as a dot-like series, and in the width direction at the front and rear. The shape may be such that the grooves 14 on both sides are connected by a groove extending over. In the present embodiment, the article central portion l ₃ , the article front portion l ₂ , and the article rear portion l ₄ are functionally divided in the longitudinal direction of the absorbent article, and the front end portion l ₁ and the both ends thereof are further divided. Although the rear end portion ₁₅ is shown as being divided into regions, in the present embodiment, each region is appropriately determined in consideration of the shape of the groove portion 14, the constricted portions 14 a and 14 b, and the action in the longitudinal direction of the leak-proof wall 6. The size and shape can be determined. Incidentally, the absorbing center portion l ₃ because the area to be directly excretion such as menstrual blood, there is in particular referred to this portion and excretion area.

4 is a cross-sectional view taken along the line IV-IV shown in FIG. 2, and FIG. 5 is a partial cross-sectional view further showing the natural shape of the cross section taken along the line VV. As shown in FIGS. 4 and 5, the leak-proof walls 6 formed on both sides in the longitudinal direction of the absorbent main body 1 of the sanitary napkin 10 of the present embodiment are an article front part l ₂ and an article rear part l _{4, respectively.} The height in the natural shape is lowered. In the article front portion l _2, in terms of the central leak-barrier walls 6b folding the upper cavity region D ₁ corresponding to the portion to crush in the thickness direction, it is fixed to opposing inner surfaces at the fixing unit 11 (11a). In this way, so as not to form a cavity region D _1, it is suppressed from excreted region l ₃ a height corresponding to the leakage preventing wall. In absorbing rear portion l _4, in terms of the central leakage preventing wall 6b inner and outer of the folded portion 9 (9a, 9b) around the portion corresponding, fixed portion for fixing as Komu knob at each height direction by 11 (11b), while substantially maintaining the upper cavity region D _1a smaller than cavity region D ₁ of the internal leakage preventing walls are lower than the absorption center portion (excretion area) l ₃ and its height. The effects on the central leakage barrier 6b when the front leakage barrier 6a and the rear leakage barrier 6c whose heights are suppressed will be described later. In addition, in the longitudinal direction of the article, it is preferable that the height of the central leak-proof wall 6b and the height of the leak-proof walls 6a and 6c whose front and rear thereof are suppressed gradually change in the natural shape, it is preferable that the its height around the boundary line K _1, K ₂ for partitioning the articles central portion (excretion area) l ₃ is changed.

In the sanitary napkin 10 of the present embodiment, as shown in FIG. 1, the belt-like stretchable sheet 7 is disposed and fixed on both sides so as to extend in the longitudinal direction of the sanitary napkin 10. And by the shrinkage | contraction of this elastic sheet 7, it forms so that the leak-proof wall 6b which has a three-dimensional form of a convex-curved surface shape by the natural skin shape at the skin contact surface side at least may stand up. The height h ₁ of the standing leak-proof wall 6 b is set higher on the skin contact surface side than the height h ₂ of the absorber 4. Then, the width direction of the cross-sectional shape of the leakage preventing wall 6b forms an inner cavity region D ₁ and D ₂ of the arc-shaped convex on the skin contact surface side, gently longitudinally convex curved shape in the excretion area l ₃ A unique three-dimensional form extending while curving is created. Here, each of the pair of stretchable sheets 7 is fixed at both side edges in a state where the pair of stretchable sheets 7 are stretched in the longitudinal direction of the sanitary napkin 10.

Leakage preventing walls 6b in the article center portion (excretion area) l ₃ in the present embodiment includes an outer folded portion stretchable sheet inwardly is fixed to the absorbent body folded portion 9 (9a) as shown in FIG. 1 9 (9b) has protruding portions 6sa and 6sb on both sides protruding from the inner end. And in the upper part of the leakage preventing wall to form a substantially "Ω" encompasses an upper cavity region D ₁ therein, outer folded portions 9b and between the outer lower end portion 13b and the absorbent body side edge portion 4e stretchable sheet 7 and form a lower cavity region D ₂ forming spaced apart.

In this embodiment, the stretchable sheet 7 is composed of two layers of sheet materials 7a and 7b, which are hydrophobic nonwoven fabrics, and a thread-like elastic member 12 interposed between both sheets, and a small convex portion 21 into which the thread-like elastic member enters. Are formed in the sheet material, and the small protrusions 21 extend in the longitudinal direction. Inner lower end 13a of the widthwise central portion W ₁ side, by being bonded by disposing stretchable sheet 7 skin contact surface side of the topsheet 2, the inner folded portion 9a is stable shape It has become. On the other hand, the outer folded portion 9b is due to steric shaping by fixing unit 11 to reduce the height of the leakage preventing walls of the article front portion l ₂ and the article rear section l _4, stable in shape at the time of natural shape or wear It is designed to be shaped. That is, the standing form of leakage preventing walls 6b in the article center portion l ₃ is further stabilized by morphological interaction between the front portion leakage preventing wall 6a and a rear portion leakage preventing wall 6c of the longitudinal ends. By forming the Ω-shaped upper cavity region D ₁ and the lower cavity region D ₂ below the Ω shape in this way, fit to the body due to the shape deformation of the upper cavity region D ₁ , the height of the leak-proof wall and the folding portion leakproof due underside contact prevention by 9, and prevent resistance further enhanced oozed from the absorber by the lower cavity region D _2.

Inner lower portion 13a in the present embodiment is a portion forming the end portion of the cavity region D ₁ side as a laminate interface between the surface sheet 2 and the stretchable sheet 7 of the absorbent body 1, the bonding of the lamination interface For example, it can be performed by an adhesive or heat sealing, and in the present embodiment, they are joined by heat sealing. While an end portion of the cavity region D ₂ side of the laminate interface between the outer lower end portion 13b stretchable sheet 7 is similarly and the backsheet 3, joining of the lamination interface can be done by adhesive or heat sealing, In this embodiment, the adhesive is fixed at the extending portion in the width direction by means such as a spiral method, a bead method, or a curtain coating method.

Further, the inside of the leak-proof wall is functionally separated into the Ω-shaped upper cavity region D ₁ and the lower cavity region D ₂ that are divided by the formation of the folding portion 9, so that the folding portion 9 (9 a, 9 b ) acts as if it were a flexible shaft, even when the leakage preventing walls upper 6g forming the cavity region D ₁ of the upper is deformed, hardly Oyobi the leakage preventing walls lower 6h its effect forms a lower cavity region D ₂ , though whether recovery of the upper cavity region D ₁ is increased as the foundation it has been stabilized (see FIG. 2, FIG. 7). Folded portions 9 may be formed only folded portion 9b of the outer side, but from the viewpoint of enhancing the trackability and resilience to the upper cavity region D ₁ of the movement of the inner folded portion 9a and outer folded portions 9b It is preferable that both are formed. The outer folding part 9b and the inner folding part 9a are preferably the same or more folded on the outer side from the viewpoint of followability and leakage prevention, and the inner and outer folding parts are not in contact with each other. Are preferably separated from the viewpoint of maintaining the shape of the leak-proof wall. The distance d ₁ between the folded portion 9a and 9b, is preferably equal to or greater than the interplanar distance d ₂ to the folded portion 9a from the inner projecting portion 6SA, overhanging portions of the inner and outer 6SA And 6 sb are preferably shorter than the distance (d ₂ + d ₃ ) obtained by adding the distances of the folding portions 9 a and 9 b from the viewpoint of maintaining the shape of the leak-proof wall. Specifically, the distance d1 between the folding portions is preferably ₁ to 15 mm, and preferably 3 to 10 mm. Note that the distances d ₂ and d ₃ between the overhanging part and the folding part and the distance d ₁ between the folding parts can be measured from the cross-sectional shape in each part, but d1 may be difficult to measure, When the distance d ₄ (FIG. 5) between the height restraining fixing part 11 at the rear part of the napkin and the distance d ₁ between the folding parts in the excretion area do not change, the value of d ₄ is set to d ₁ and the leakage prevention wall of the excretion area may be in more of a width as divided by 2 minus the value of d ₄ calculates a simplified manner.

FIG. 6 is a cross-sectional view schematically illustrating one embodiment of the napkin 10 according to this embodiment when worn along the line II in FIG. At this time, the side wings 18 of the napkin 10 are worn so as to be folded back on the back of an undergarment (not shown). The sanitary napkin in this embodiment, is formed a groove portion 14 forming a recess in the absorber in the widthwise direction periphery W ₂ of the central portion l ₃ of the article longitudinally. And the middle-high part 1a of an absorptive main body is formed between this groove part 14 in the longitudinal direction center part of an absorptive main body. The depth of the groove part 14 is comprised from the low pressing part between the high pressing part and the high pressing part which are partially deep. The groove portion 14 is formed in a curved shape so as to avoid the upper layer absorber 4a inside the middle-high portion 1a in plan view, and the front portion and the rear portion are constricted (14a, 14b) at the boundary (see FIG. 2). Accordingly, even when the three-dimensionally curved deformation from the lower abdomen during use of the sanitary napkin along the gluteal cleft dorsally, in the absorption center portion (excretion area) l ₃ which receives the excretion such as menstrual blood mainly The bendability in the width direction peculiar to the groove portion 14 as a flexible shaft is shown. That is, warped bow resistance is suppressed in the longitudinal direction of the absorbent body or absorbent body excretion region l _3, giving flexibility in the widthwise direction. As a result, as shown in FIG. 6, gently curved in groove 14 along the shape of the crotch in the absorption center portion l _3, curved become cross bow so as to be convex relative to the body, the article surface Fits the contours of the body without gaps. Furthermore, by appropriate bending in the width direction to be maintained in the absorbent central l _3, the upper layer absorbent body 4a of the absorbent body 1 faces the wearer's skin 22 so as to protrude supported at the center, on both sides of the in use leakage preventing wall 6b, in particular to mitigate that the upper cavity region D ₁ too crushed, becomes easier to maintain the proper fit and leak-proof due to the leakage preventing wall 6b.

In the napkin of the present embodiment, as described above, the height of the front and rear leakage barriers 6a and 6c is lower than the central leakage barrier 6b in the excretion region in the natural shape. In the front part leakage preventing walls 6a, and joined to the interior of the cavity region D ₁ corresponding to portions of the Ω shape by a hot melt or heat seal or the like joining means, are fixed portion 11 for fixing the upper and lower surfaces (11a) is formed Yes. Rear portion of the height in the leakage preventing wall 6c suppression external cavity region D ₁ of the Ω shape joined by joining means of the hot melt, etc., have been made by forming a fixing portion 11 (11b). Thus, by forming the fixing portion 11 for suppressing the height inside and outside the cavity, the height of the portion can be suppressed while maintaining the expansion and contraction characteristics in the longitudinal direction of the portion. Therefore, it is possible to maintain the fit along the body shape extending from the lower abdomen to the fissure while gently curving the absorbent article into an arcuate shape. Moreover in the central portion l _3, the domed section 1a and the leakage preventing wall 6 and is next to the side wall 23a of the absorbent body in the width direction peripheral portion becomes the bottom surface 23b of the absorbent body, on both outer side of the domed portion 1a in a natural shape A pocket-like portion 23 that is concave toward the skin contact surface side is formed (see FIGS. 1 and 6). From such a point, embodiment which provides the adhesion part 11 for height suppression inside a cavity applies to the front part leak-proof wall 6a along a site | part with a large curvature change, ie, a wearer's mound. Is preferred. On the other hand, according to the embodiment in which the fixing portion 11 for suppressing the height is provided on the outer surface of the lower portion of the cavity, the height can be suppressed while leaving the cavity, and therefore, it is preferably applied to the rear leakage barrier. And as a result, the fitting property of the leak-proof wall 6 is maintained high, and the followability with respect to a wearer's movement is high.

Moreover, the crease | corresponding corresponding to the folding part 9 is more effectively shape-fixed by forming the fixing | fixed part 11 for height suppression in the front and back leak-proof walls 6a and 6c. Therefore, the shape stabilizing action extends to the central leak-proof wall 6b in the excretion region, and the shape of the folded portion 9 bent into a substantially “<” shape is stabilized. Furthermore, it is easy to maintain the shape of between folded portion 9 of the central portion leakage preventing wall 6b is separated, and hardly collapse the cavity region D ₁ of the Ω-shaped, and folded portion 9 is easily restored to act as a flexible shaft (See FIG. 7).

  The leakage preventing wall upper portion 6g including the Ω-shaped cavity of the present embodiment can easily recognize the softness of the air cushion from the appearance (see FIG. 7). In particular, the roundness of the skin contact side portion 6w at the top of the leak-proof wall impresses with the softness and the height of the leak suppression effect. On the other hand, even if the inner cavity is crushed and contacted with the surface sheet wetted with menstrual blood or the like, the skin surface non-contacting side portions 6u and 6v of the leakage preventing wall upper portion serving as the contact area are overhang portions 6s (6sa, 6sb) is not visible in plan view, and it is difficult to recognize the dirt (dirt) 29, giving a clean impression. Further, even when actually used, the upper part of the leak-proof wall has a function of hardly causing dirt (see FIG. 8). Furthermore, in this embodiment, the folding part 9 clarifies the distinction of the leak-proof wall 6 having a portion shaped in an Ω shape from the surface sheet 2 functionally and visually, and gives a sense of security when worn. It is easy to be done. Further, even when the cavity is crushed by the pressure during use and the leak-proof wall 6 directly contacts the surface sheet, the contacting surface is the contact side portion 6w, and not only the dirt 29 is not visible, but also the skin is directly stained. Suppress it. In particular, in this embodiment, the overhanging portions 6s on both sides of the cavity are preferable because the cavity is easily maintained even when the cavity is deformed.

Especially for absorbent articles such as sanitary napkins for night use that are becoming increasingly long in recent years, a large elastic force of the elastic sheet is required to obtain an appropriate curved state in the longitudinal direction of the article. It is difficult to achieve both strength and keeping the height of the leak-proof wall 6 high. In contrast napkin 10 of the present embodiment, excretion region (absorption central) l ₃ longitudinal stretchable sheet 7 to the vicinity partially fixed height by the fixation unit 11 is suppressed leakage preventing walls 6a, a 6c by being, can these is the curvature of the article portion is substantially independent, stably maintained high central portion height of the leakage preventing walls 6b of the article middle portion l ₃ is excreted region . Moreover, the absorbent body 1 of this embodiment is the widthwise central portion W ₁ is a two-layer structure (upper layer absorber 4a, the lower absorbent member 4b), the widthwise central portion W ₁ is higher than the peripheral portion W _2, The relationship is not changed by the pressure at the time of mounting. Therefore, the middle-high structure of the central portion W ₁ exhibits a supporting action, and the hollow region D ₁ inside the leak-proof wall 6 is difficult to be crushed. As a result, the leak-proof wall 6 fits against deformation due to pressure and movement during mounting, and the leak-proof property is maintained high.

The napkin 10 of this embodiment fits in particular so that the leak-proof wall 6b in the center portion softly wraps the skin surface of the wearer from the outside. Moreover, the leak-proof wall 6b is not almost completely crushed, so that the leak-proof wall 6b itself is hardly soiled and the wearer's skin can be kept clean. Also, since the good contact is maintained between the widthwise central portion W ₁ in middle and high absorbent body 1 and the wearer's skin surface in the excretion area, it exhibits good absorbency caught reliably excreted liquid or the like. On the other hand, since the direct contact is less likely to occur between the peripheral portion W pocket-like portion 23 at ₂ is formed article and the skin surface of the excretion area, hardly occurs a phenomenon that the body fluid is transmitted. And since dirt in the skin contact surface side portion 6w on the top side portion 6t side from the overhanging portion 6s of the leak-proof wall is suppressed / prevented, not only does the leak hardly occur, but also an impression (security) that does not leak. Can be given to the user.

  As the top sheet 2, the back sheet 3, and the absorber 4 in the sanitary napkin 10 of the present embodiment, materials usually used for this type of article can be used. As the surface sheet 2, as a material that does not stay liquid and is easy to permeate, for example, a perforated film having a three-dimensional liquid introduction pipe or a non-woven perforated body having a concavo-convex structure is preferable. The back sheet 3 is preferably a film made of a resin material such as polyethylene. Moreover, pulp, a mixture of a superabsorbent polymer, and a polymer sheet can be used for the absorber 4, and it is also preferable to arrange | position the intermediate sheet by the nonwoven fabric which improves liquid return prevention property on the upper surface of an absorber.

  In the napkin 10 of the present embodiment, the main body adhesive portion 25 that is fixed to clothes such as underwear and the like on the non-skin contact surface side of the back sheet 3, that is, the outer surface of the back sheet 3 and the side opposite to the absorbent body 4 A wing adhesive portion 26 of the wing portion is disposed (see FIG. 1).

  In the present embodiment, the stretchable sheet 7 has a sheet shape, and the material and structure thereof are not particularly limited as long as they have stretchability. For example, examples of the sheet material include stretchable films, nonwoven fabrics, woven fabrics, and laminated sheets thereof. Specifically, a film made of a natural rubber, a polyurethane, a polystyrene-polyisoprene copolymer, a polystyrene-polybutadiene copolymer, a polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene, etc., is a stretchable film. , Non-woven fabrics, woven fabrics, and laminates of these films and non-woven fabrics. The stretchable film is made of polyethylene / polyester, polyethylene / polypropylene or polypropylene in order to improve the touch or heat sealability when used on the skin contact surface side of the top sheet. It is preferably laminated with a thermoplastic nonwoven fabric and used as a laminated material. Such a thermoplastic nonwoven fabric preferably uses crimped fibers so that the nonwoven fabric itself has stretchability. When laminating non-crimped nonwoven fabric that is difficult to stretch, it is necessary to stretch in advance before laminating. Only the film may be stretched to a predetermined stretch ratio and bonded to the nonwoven material by hot melt, heat sealing, or the like, and the elastic film may gather other layers.

In the present embodiment, the stretchability of the stretchable sheet 7 does not need to be uniform as a whole. From the viewpoint of the shape stability of the leak-proof wall and the combination with other constituent materials, the stretchability is different or stretchable. It is preferable to form a portion having no gap. Specifically, it is preferable that the skin contact side portion 6w above the overhang portion 6s of the Ω-shaped leak-proof portion upper portion 6g of the leak-proof wall 6 exhibits elasticity. By doing in this way, the folding shape of the folding part 9 can be stabilized, it can be made difficult to give the influence of the upper part of the leak-proof part by the lower part of the leak-proof part, and good stretchability in the longitudinal direction of the article is expressed. be able to. On the other hand, it is preferable not coordinated an elastic member so as not to express stretch function in the portion of the lower end portion 13 and the width direction extending portion W _3. In this way, it is preferable that the three-dimensional shape stability and the flexible stretchability of the stretchable sheet 7 can be adjusted and adjusted for each region.

In the napkin 10 of this embodiment, the shaping surplus part of the leak-proof wall 6 extends to the front end part ₁₁ and the rear end part ₁₅ in the outer side in the longitudinal direction. The front end portion ₁₁ and the rear end portion ₁₅ do not have the leak-proof wall 6 structure, and the elastic function of the stretchable sheet 7 is lost. This is preferable from the viewpoint of conforming to the lower abdomen or the upper part of the tailbone of the wearer's skin without much unevenness and realizing good fit and uncomfortable feeling. Specifically, even if the elastic member is arranged, the elastic member and the sheet material are not fixed so as not to substantially exhibit the expansion / contraction function, or other materials (for example, absorber) so as not to exhibit the expansion / contraction function. And fixing by heat sealing or an adhesive. Among them, from the viewpoint of flexibility at the front end portion ₁₁ and the rear end portion ₁₅ , it is preferable that no elastic member is disposed or the elastic member and the sheet material are not fixed, and the sheet material is also separated from the absorbent main body. It is preferable to have such a portion.

The sanitary napkin of this embodiment is normally distributed and stored in a folded shape (packaging form) of an absorbent article, and this is used after being unfolded when worn. Therefore, in this embodiment, in consideration of stabilization of the standing shape of the leak-proof wall when it is folded and packaged once and then deployed (see FIG. 2), the leak-proof groove 14 is constricted (14a, 14b) at the folded position. Is formed. Further the start position of the fixing portion 11 of the height suppression of the leakage preventing walls in this embodiment, whether the position of the constriction of Bomomizo 14, offset slightly more backward than the rear l ₄ side more forward than the front l ₂ side Thus, the standing property of the leak-proof wall in the natural shape is further enhanced.

  The absorbent article of the present invention has been described in detail by taking the sanitary napkin as the preferred embodiment as an example, but the present invention is not construed as being limited thereto. The absorbent article of the present invention may be a sanitary napkin, incontinence pad, panty liner, disposable diaper, etc., but the fit to the body curve shape and the usefulness of leakage prevention, and the body curve shape A sanitary napkin or incontinence pad that uses shorts or the like at the time of wearing is preferable from the viewpoint of easily obtaining a support other than the absorbent article for deformation to the length of the absorbent article, and the length of the absorbent article is preferably 28 cm or more, 30 to 45 cm Is more preferable.

It is a perspective view which shows typically the sanitary napkin which is preferable embodiment of the absorbent article of this invention by a natural cross section with a partial cross section. It is a fragmentary sectional view which expands and shows the cross section of the sanitary napkin shown in FIG. It is the top view seen from the skin contact surface side which shows the whole sanitary napkin shown in FIG. It is the fragmentary sectional view which expands and shows the IV-IV line cross section of the sanitary napkin shown in FIG. It is a fragmentary sectional view which expands and shows the VV sectional view of the sanitary napkin shown in FIG. It is the use condition explanatory drawing which shows the state at the time of wear of the sanitary napkin of this embodiment in the II cross section shown in FIG. It is a use condition explanatory drawing which further illustrates more schematically the deformation behavior of the leak-proof wall of the sanitary napkin of this embodiment with the expanded section shown in FIG. It is a use condition explanatory view which shows further another deformation behavior of the leak-proof wall of the sanitary napkin of this embodiment further further modeled by the expanded section shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent body 2 Top sheet 3 Back sheet 4 Absorber 6 Leak barrier 7 Stretch sheet 9 Folding part 10 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 11 Adhering part 12 Elastic member 13 The lower end part (fixed part) of a leak-proof wall
14 Groove part 17 Peripheral seal part 18 Wing 21 Small convex part 22 Wearer's skin surface 23 Pocket-shaped part 25 Main body adhesive part 26 Wing adhesive part

Claims (7)

Leak-proof on both sides of the absorbent main body in the longitudinal direction on the absorbent main body comprising a surface sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and an absorbent body interposed between the two sheets. An absorbent article in which a stretchable sheet forming a wall is arranged,
The absorptive main body has a middle-high portion in which the central portion in the width direction is higher on the skin contact surface side than the peripheral portion in the width direction in the central portion in the longitudinal direction,
Each of the leak-proof walls on both sides of the absorbent main body is in a natural shape, stands up while holding a cavity therein so as to form a protruding portion in which both side wall surfaces bulge outward while being convex on the skin contact surface side, The stretchable sheet constituting the standing leakage barrier is fixed to the absorbent main body at the widthwise inner lower end and the widthwise outer lower end in the widthwise cross section, and the width of each of the standing leakage barriers An absorbent article having a folded portion that enters a cavity side inside the leak-proof wall between the skin contact surface side upper end portion and the width direction outer lower end portion in the direction cross section.   The absorbent article according to claim 1, wherein a cavity inside the leak-proof wall is divided into an upper cavity region and a lower cavity region with a position corresponding to the folded portion of the leak-proof wall as a boundary.   The hollow which integrates the said surface sheet and the said absorber in the width direction periphery part of the longitudinal direction center part of the said absorptive main body is formed so that it may extend in the longitudinal direction of the said absorptive main body. Absorbent articles.   The absorbent article according to any one of claims 1 to 3, wherein the height of the leak-proof wall is such that the height at the longitudinal rear portion of the absorbent main body is lower than the height of the central portion in the longitudinal direction. .   In the longitudinal central portion of the absorbent main body, the peripheral portion in the width direction forms a bottom surface, the middle and high portions in the middle portion in the width direction form side walls, and both outer sides of the middle and high portions in a natural shape. The absorbent article according to any one of claims 1 to 4, wherein a pocket-like portion having a concave shape is formed on the skin contact surface side.   The longitudinal direction center part of the said absorptive main body is any one of Claims 1-5 in which the shape made high in the width direction center part is maintained rather than the width direction periphery part by the deformation | transformation by the pressure at the time of wear. The absorbent article as described.   The absorbent article according to any one of claims 1 to 6, wherein the stretchable sheet is a strip-shaped composite sheet having a sheet material and an elastic member.

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