JP2017042383A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach an absorbent article to a proper position easily, regardless of a shape of panties and a body type of a user, achieve good attachment property and prevent leakage.SOLUTION: An absorbent article comprises side part flaps 10 formed by extending a rear surface sheet 2 and side nonwoven fabric parts 7 to side parts of an absorber 4 over whole length of a napkin, and end edges of the side part flaps 10 are formed into an almost linear shape along a napkin longitudinal direction. The side part flaps 10 comprise: a gathering forming part 11 in which an inner side part of a crotch part in a width direction forms a part of a loop-state three-dimensional gathering BS, in an attachment state, in which a part extended from a crotch part of panties 30 to a side part is folded to a non-skin side and is fixed to an outer face of the panties 30; a wing forming area 12 in which an outer side part of the crotch part in the width direction forms a wing-state flap W; and a hip hold forming area 13, in which a rear part forms a hip hold flap HF for covering a hip part in the panties.SELECTED DRAWING: Figure 1

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood, vaginal discharge, and the like, and more specifically, a long absorbent body is provided at the rear to cover the wearer's buttocks. In an absorbent article, it is related with the absorbent article provided with the flap which integrated the three-dimensional gather, the wing-shaped flap, and the flap for hip-holds.

  Conventionally, as absorbent articles such as sanitary napkins, panty liners, incontinence pads, liquid-impervious back sheets such as polyethylene sheets or polyethylene sheet-laminated nonwoven fabrics, and liquid-permeable surface sheets such as nonwoven fabrics or liquid-permeable plastic sheets There is known an intervening absorber made of cotton-like pulp or the like.

  In recent years, various products according to the amount of body fluid and the wearing time zone have been proposed for the absorbent article. For example, in the sanitary napkin for night use, in addition to the wing-shaped flaps provided on both sides in the middle in the longitudinal direction of the napkin, the buttock side is completely covered in order to more securely fix the shorts and prevent the back leak. For this reason, there is one provided with flaps extending to the side portions (hereinafter referred to as hip-hold flaps) on both side portions on the rear side.

  Specifically, as shown in FIGS. 6 and 7, the absorbent article 50 (sanitary napkin) quickly transmits the liquid-impervious back sheet 52 made of a polyethylene sheet and the like, menstrual blood, and the like. A liquid-permeable surface sheet 53, an absorbent body 54 made of cotton-like pulp or synthetic pulp interposed between both sheets 52, 53, and a pair of left and right three-dimensional gathers BS, BS provided on both sides of the surface side The outer edge of the liquid-impervious back sheet 52 and the liquid-permeable surface sheet 53 at the front and rear edges of the absorber 54 is an adhesive such as hot melt or heat. The three-dimensional gather BS is formed with the liquid-impervious back sheet 52 that is bonded by an adhesive means such as a seal and that extends to the side of the absorbent body 54 at both side portions (side flap portions). Wing-shaped flaps W which are joined to the side nonwoven fabric 55 by an adhesive such as hot melt or an adhesive means such as heat seal, and project laterally by the laminated sheet portion of the liquid-impermeable back sheet 52 and the side nonwoven fabric 55. , W are formed, and hip-hold flaps HF and HF are formed on the rear side portion.

  Adhesive layers 56, 57,... Are respectively provided on the outer surface sides of the wing-shaped flaps W, W and the hip-hold flaps HF, HF. In order to attach the sanitary napkin 50 to the shorts, the sanitary napkin 50 is locally applied, the wing-like flaps W, W protruding sideways are taken out of the shorts, and the flap folds RL, RL At the same time, it is attached to the outer surface of the crotch portion of the shorts while the crotch portion of the shorts is wound, and the adhesive layers 57 and 57 of the hip-hold flap HF are attached to the inner surface of the shorts (FIG. 8). reference).

  Many improvements have been made to such an absorbent article, and various articles having improved fit to the body have been proposed. For example, in Patent Document 1 below, as a leak-proof wall, one side part and the other side part in the longitudinal direction of the elastic sheet are joined to the absorbent main body at the joint part, and the expansion and contraction is performed in front and rear of the excretory part region An absorbent article formed by joining an absorbent sheet to the absorbent main body and standing in a hollow loop shape in the excretion region is disclosed.

  Further, in Patent Document 2 below, a flap is formed by an extension part of the top sheet and an extension part of the back sheet, and the extension part of the top sheet and the back sheet has a portion that can be extended therein. An absorbent body is disclosed.

JP 2010-42061 A Japanese translation of PCT publication No. 2002-508893

  However, in the above-described conventional absorbent article 50, the fixing position to the shorts is limited to some extent by the wing-shaped flap W, and the wing-shaped flap W can be folded only at a certain position depending on the shape of the shorts. In some cases, the mounting position is shifted from the proper mounting position. In addition, some users may want to wear it forward or backward due to differences in body shape or past experience, but if the position of the wing-shaped flap W and the shape of the shorts do not match, the desired position will be obtained. In some cases, it was not possible to install. If the absorbent article is not mounted in the proper position, the length from the blood drainage port to the front end may be short, leading to a front leak, or a constricted portion between the wing-shaped flap W and the hip-hold flap HF or the hip Since the holding flap HF is not adapted to a predetermined part of the wearer, there is a problem that the wearability is deteriorated and side leakage or rear leakage occurs.

  Further, when the mounting position of the absorbent article is shifted, the tip of the three-dimensional gather BS does not adhere to the skin surface, and there is a problem that a gap is generated between the skin surface and leakage occurs. On the other hand, the three-dimensional gather BS is provided with an elastic stretchable member in a stretched state on the nonwoven fabric and adheres both ends in the longitudinal direction of the nonwoven fabric to the absorbent article main body side, so that an intermediate The adhesive part is erected on the skin side. However, when the tension of the elastic elastic member is too strong, the elastic elastic member contracts when trying to pull up the shorts to which the absorbent article is fixed at the time of wearing. Due to the force, the distance between the front and back of the shorts was narrowed and the shorts were curled up, making it difficult to wear them.

  Furthermore, in the absorbent article described in Patent Document 1, when the absorbent article is not attached to an appropriate position with respect to the shorts, or when the shape of the absorbent article does not match the shape of the shorts, In some cases, the loop-shaped leak-proof wall does not adhere to the skin, and leakage occurs and soils the shorts.

  Moreover, in the absorber of the said patent document 2, since a top sheet and a back sheet can extend | expand, if a three-dimensional gather is provided temporarily, a three-dimensional gather will become easy to deform | transform by expansion / contraction of a top sheet or a back sheet. For this reason, it is considered that the three-dimensional gather is difficult to fit on the skin surface and leakage is likely to occur.

  Therefore, the main problem of the present invention is to provide an absorbent article that can be easily mounted at an appropriate position regardless of the shape of the shorts, the body shape of the user, etc., has good wearability, and prevents leakage. There is.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and side nonwoven fabrics are respectively provided along the longitudinal direction on both sides of the surface side. In the absorbent article provided,
A side flap is formed by extending the back sheet and the side nonwoven fabric to the side of the absorbent body over the entire length of the absorbent article, and the edge of the side flap is along the longitudinal direction of the absorbent article. Formed in a straight line,
The side flap is a three-dimensional gather in which the widthwise inner side part of the crotch part is a loop-shaped three-dimensional gathering in a wearing state in which a part extending laterally from the crotch part of the shorts is folded back to the non-skin side and fixed to the outer surface of the shorts A hip-holding flap that is a gather forming region that constitutes a part of the crotch portion, a wing forming region that constitutes a wing-shaped flap in the widthwise outer side portion of the crotch portion, and a rear portion that covers the buttocks in the shorts There is provided an absorbent article characterized in that it is a hip-hold forming region that constitutes.

  In the first aspect of the invention, since the edge extending to the side of the side flap is formed linearly along the longitudinal direction of the absorbent article, the shape of the shorts, the shape of the user, etc. Regardless of this, it can be worn at any position that fits the user's body. Specifically, the side flap is a state in which a portion extending laterally from the crotch portion of the shorts is folded back to the non-skin side and fixed to the outer surface of the shorts, and the inner side portion in the width direction of the crotch portion is a loop. And a wing-forming region that forms a wing-shaped flap in which the widthwise outer side portion of the crotch portion is fixed to the outer surface of the shorts, and a rear portion. Is a hip-hold forming region that constitutes a hip-hold flap that covers the buttocks in the shorts. Thus, in this absorbent article, each part constitutes a three-dimensional gather, a wing-shaped flap and a hip-hold flap according to the position attached to the shorts, so regardless of the shape of the shorts or the body shape of the user, It can be easily mounted at an appropriate position, has good wearability, and fits the body to prevent leakage.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the side flaps are provided with stretchability in the longitudinal direction of the absorbent article at least in the crotch portion.

  In the invention according to claim 2, at least the crotch portion of the side flaps is provided with elasticity in the longitudinal direction of the absorbent article so that the portion extending laterally from the crotch portion of the shorts when worn is not When a loop-shaped three-dimensional gather is formed by folding back to the skin side, the three-dimensional gather becomes easier to fit around the legs, and leakage can be reliably prevented.

  As a third aspect of the present invention, the side flap includes a plurality of elastic elastic members arranged along the longitudinal direction of the absorbent article and spaced apart in the width direction at least in the crotch portion. The absorbent article according to claim 1, wherein a pitch is set to be smaller in the gather formation region than in the wing formation region.

  In the invention of claim 3, the side flaps are provided with elasticity by arranging a plurality of elastic elastic members along the longitudinal direction of the absorbent article and spaced apart in the width direction at least in the crotch part. In this case, the pitch of the elastic elastic members is set so that the gather formation region is smaller than the wing formation region. For this reason, in the gather formation region where the pitch of the elastic elastic members is relatively small, when a hollow loop-shaped three-dimensional gather is formed, the side nonwoven fabric stands on the skin side starting from the elastic elastic members, and the elastic elastic members As a starting point, the cross section is easily formed into a loop-like curved shape. In addition, the gather forming region standing on the skin side can easily fit the skin surface along the leg circumference. On the other hand, in the wing formation region where the pitch of the elastic elastic members is relatively large, there are few starting points on the skin side, so that the portion that becomes the wing-shaped flap is easier to follow along the non-skin side of the shorts, and from the crotch portion of the shorts As the extended side flaps extend along the legs and the non-skin side of the shorts, the uncomfortable feeling around the legs is reduced. Thus, by providing two areas where the pitches of the elastic elastic members are different, the gather forming area can easily serve as a three-dimensional gather and the wing forming area can serve as a wing-shaped flap.

  As the present invention according to claim 4, there is provided an absorbent article according to any one of claims 1 to 3, wherein the hip hold forming region is not provided with stretchability.

  In the invention according to the fourth aspect, the hip hold forming region does not impart stretchability so as to cover a wider range of the buttock.

  As the present invention according to claim 5, in the wing forming region, a non-stretchable region to which no stretchability is imparted is provided in a rear portion of the crotch portion that hits the rear of the crotch portion of the shorts in the mounted state. 4. An absorbent article according to any one of 4 is provided.

  In the invention according to claim 5, a non-stretchable region to which stretchability is not imparted is provided in the rear portion of the crotch portion that hits the rear of the crotch portion of the shorts in the mounted state in the wing forming region. If stretchability is imparted to this region, it causes twists and wrinkles in the hip hold formation region provided behind the wing formation region, so that stretchability is not imparted to this region.

  As an aspect of the present invention according to claim 6, there is provided an absorbent article according to any one of claims 1 to 5, wherein a slip prevention means for fixing to the shorts is provided on the surface of the side flap on the back sheet side. Is done.

  In the invention described in claim 6, since the wing forming region and the hip hold forming region constitute a wing-shaped flap and a hip hold flap in the mounted state, respectively, a slip stopper for fixing the side flap to the outer surface of the shorts. Means are provided.

  As the present invention according to claim 7, a plurality of embossed portions are provided on the outer side in the width direction of the side flaps at intervals in the longitudinal direction of the absorbent article. An absorbent article is provided.

  According to the seventh aspect of the present invention, a plurality of embossed portions are provided on the outer side in the width direction of the side flaps at intervals in the longitudinal direction of the absorbent article. It becomes possible to check whether the part flap is attached in a predetermined state.

  As described above in detail, according to the present invention, it is possible to provide an absorbent article that can be easily mounted at an appropriate position regardless of the shape of the shorts, the body shape of the user, and the like, has good wearability, and can prevent leakage. become.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view of FIG. It is the III-III arrow directional view of FIG. It is sectional drawing (II-II arrow directional view of FIG. 1) which shows a mounting state. It is an expanded view of the sanitary napkin 1 which concerns on another form example. It is an expanded view which shows the conventional absorbent article 50. It is a VII-VII arrow line view of FIG. It is a perspective view of the shorts which shows the mounting state of the conventional absorbent article 50.

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

[Basic structure of sanitary napkin 1]
The sanitary napkin 1 according to the present invention has a function of fixing the rear part of a napkin having a long rear side so as to cover a wide range of the buttocks, such as a so-called night napkin or a napkin for many hours, such as a polyethylene sheet. A liquid-impervious back sheet 2 made of, a liquid-permeable surface sheet 3 that quickly permeates menstrual blood, or vaginal discharge, and cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3. An absorbent body 4, an encapsulating sheet 5 made of crepe paper or a non-woven fabric surrounding the absorbent body 4 in order to maintain the shape of the absorbent body 4 and improve diffusibility, and both sides of the surface along the longitudinal direction. It is mainly comprised from the formed side nonwoven fabric 7, and in the circumference | surroundings of the said absorber 4, the outer edge part of the said liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is in the upper-lower-end edge part. The liquid-impervious back sheet 2 and the side nonwoven fabric 7 that are joined by an adhesive such as hot melt or an adhesive means such as heat seal and that extend laterally from the absorbent body 4 at both side edges thereof are hot. The side flaps 10 are formed laterally by the laminated sheet portion formed by the liquid-impervious back sheet 2 and the side nonwoven fabric 7 and bonded by an adhesive such as a melt or an adhesive means such as heat seal.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impervious back sheet 2, a sheet material having at least water shielding properties such as polyethylene is used, but in recent years, a material having moisture permeability tends to be used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used. One or a plurality of adhesive layers (not shown) are formed on the non-use surface side (outer surface) of the liquid-impermeable back sheet 2 so as to fix the sanitary napkin 1 to the underwear when worn on the body. It has become. As said liquid-impermeable back sheet 2, you may use the polylamination nonwoven fabric which laminated | stacked the plastic film and the nonwoven fabric.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. As the material fibers constituting the nonwoven fabric, in addition to olefins such as polyethylene or polypropylene, polyesters, polyamides, and other synthetic fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is bulky and excellent in compression recovery. When a large number of pores are formed in the liquid-permeable surface sheet 3, menstrual blood, venom, etc. (hereinafter collectively referred to as body fluids) are quickly absorbed, and are excellent in dry touch properties. It will be a thing. It is desirable to prevent side leakage by applying various embosses from the upper surface side of the liquid-permeable surface sheet 3 to promote retention of body fluids and increase absorption efficiency. The non-woven fiber may be either a long fiber or a short fiber, but preferably a short fiber is used in order to give a towel texture. In order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can be suitably used.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the top sheet 3 is, for example, a mixture of a highly water-absorbent resin in pulp, or a mixture of chemical fibers in the pulp and a high water absorption. A material mixed with a conductive resin is used. As shown in the figure, the absorbent body 4 is made of crepe paper, non-woven fabric or the like as shown in the figure in order to quickly retain the shape and rapidly diffuse menstrual blood and prevent reversal of once absorbed menstrual blood and the like. It is desirable to surround by the encapsulating sheet 5. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. Further, as the absorber 4, an air-laid absorber that can reduce the bulk may be used.

  The absorbent body 4 may be mixed with synthetic fibers. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

  Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the highly water-absorbent resin is desirably 10 to 60% of the weight of the absorber. When the content of the superabsorbent resin is less than 10%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.

  When providing the encapsulating sheet 5 surrounding the absorbent body 4 as in this example, as a result, the encapsulating sheet 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4, A body fluid is quickly diffused by the encapsulating sheet 5 having excellent absorbability, and reversal of menstrual blood and the like is prevented.

On the other hand, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width of the absorbent body 4 and covers the absorbent body 4 as shown in the cross-sectional views of FIGS. The side nonwoven fabrics 7 and 7 different from the liquid-permeable surface sheet 3 are provided on both sides of the surface side. Specifically, the side nonwoven fabric 7 is made of a nonwoven fabric material that has been subjected to appropriate water-repellent treatment or hydrophilic treatment, depending on the purpose such as preventing menstrual blood or vaginal discharge from penetrating or enhancing touch feeling. It is configured using. The side nonwoven fabric 7 can be made of natural fiber, synthetic fiber, regenerated fiber, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 7 eliminates the feeling of stickiness and prevents stuffiness. For this reason, it is preferable to use an air-through nonwoven fabric having a reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 13 to 23 g / m ² , and silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. to reliably prevent the passage of body fluids. A water repellent nonwoven fabric coated with is preferably used. Further, nonwoven fabrics having a three-layer structure or a four-layer structure, such as spunbond-meltblown-spunbond nonwoven fabric (SMS nonwoven fabric), spunbond-spunbond-meltblown-spunbond nonwoven fabric (SSMS nonwoven fabric), spunbond-meltblown-meltblown-spun A bond nonwoven fabric (SMMS nonwoven fabric) can also be used. Moreover, as the said side nonwoven fabric 7, you may use the sheet | seat which improved the waterproofness by laminating | stacking and bonding a nonwoven fabric and a plastic sheet.

  As shown in FIGS. 2 and 3, the side nonwoven fabric 7 has an outer portion from the inner side of the width direction intermediate portion to slightly beyond the absorber side edge to the outer edge of the liquid-impermeable back sheet 2. The side flaps 10 are formed by a laminated sheet portion of the side nonwoven fabric 7 and the liquid-impervious back sheet 2 that is bonded over an area with an adhesive such as hot melt.

[Side flap 10]
The side flap 10 extends the liquid-impervious back sheet 2 and the side nonwoven fabric 7 to the side of the absorbent body 4 over the entire length of the sanitary napkin 1, and the side nonwoven fabric 7 and the liquid-impervious back surface. It is comprised by the lamination sheet part by the sheet | seat 2. FIG. The above-mentioned “over the entire length” means that the front and rear end edges of the sanitary napkin 1 are formed by arcuate curves that bulge outward, so that the side portion is compared with the entire length of the main body portion in the center in the width direction. Although the overall length of the flap 10 is slightly shortened, only the side flap 10 exists in the portion extending to the side of the absorbent body 4, and this side flap 10 extends over almost the entire length of the sanitary napkin 1. It means that it is formed. The front and rear edges and the side edges of the side flap 10 are free ends so that they can be folded back freely.

  The side flap 10 is formed such that the edge on the outer side in the width direction of the sanitary napkin 1 is linearly formed along the longitudinal direction of the sanitary napkin 1. That is, in the conventional sanitary napkin, as shown in FIG. 6, the wing-shaped flap W and the hip-hold flap HF protrude sideways so that the other portions are relatively narrowed in the width direction. In contrast, in the sanitary napkin 1 according to the present invention, the side edge of the side flap 10 is formed linearly in the longitudinal direction of the napkin, and is formed by a substantially uniform width over the entire length of the napkin. Does not have extreme constrictions. Here, as shown in FIG. 1, “being formed linearly” includes, for example, a case where the edge of the side flap 10 is on the outer side in the width direction or on the inner side, in addition to the case where it is formed of a straight line parallel to the napkin longitudinal line It is a concept that includes those having a slight unevenness in the width direction, such as being formed by an arcuate curve slightly protruding toward the side. However, the variation rate in the width direction of the edge is 20% or less, preferably 10% or less with respect to the average line of the widths of the side flaps 10. When the side edge of the absorbent body 4 is formed by a straight line along the longitudinal direction of the napkin, the side edge of the side flap 10 is preferably formed by a straight line substantially parallel to the side edge of the absorbent body 4. The width of the side flap 10 is 20 to 100 mm, preferably about 50 to 70 mm in the napkin width direction from the side end of the absorbent body 4.

  As shown in FIGS. 1 and 4, the side flap 10 is folded in a side extending from the crotch portion of the shorts 30 to the non-skin side and fixed to the outer surface of the shorts 30. The width direction inner side portion of the crotch portion is a loop-shaped three-dimensional gather BS, and a gather forming region 11 constituting a part of the BS, and the width direction outer side portion of the crotch portion that is folded back to the non-skin side is a wing shape. A wing forming region 12 constituting the flap W is formed, and a rear portion is a hip hold forming region 13 constituting a hip hold flap HF that covers the buttocks in the shorts 30. As shown in FIG. 4, the loop-shaped three-dimensional gather BS is formed in a hollow shape by folding back a portion where the side flap 10 extends laterally from the crotch portion of the shorts 30 when worn. The shorts 30 are continuously provided from the side edge. For this reason, the followability with respect to the leg periphery is good, and the leg periphery is fitted to increase the leakage prevention effect. The loop-shaped three-dimensional gather BS is formed by the gather forming region 11 on the inner side in the width direction in close contact with the leg periphery, and formed by the wing forming region 12 on the outer side in the width direction.

  The gather formation region 11 includes a region corresponding to at least a crotch portion that extends laterally from the crotch portion of the shorts 30 when attached to the longitudinal direction of the napkin, and is provided with stretchability described later. is there. Moreover, with respect to the napkin width direction, it is a region on the inner side in the width direction in which the arrangement pitch of the elastic elastic members 14 is relatively small in a region to which elasticity described later is given.

  Further, the wing forming region 12 includes at least a region corresponding to the crotch portion extending laterally from the crotch portion of the shorts 30 at the time of wearing in the longitudinal direction of the napkin, and is provided with elasticity described later. It is an area. Moreover, with respect to the napkin width direction, it is a region on the outer side in the width direction in which the arrangement pitch of the elastic elastic members 14 is relatively large in a region to which elasticity described later is given. The boundary in the napkin width direction between the gather formation region 11 and the wing formation region 12 is not necessarily clear, and the relatively inner side in the width direction that closely contacts the leg at the crotch portion is the gather formation region 11. The relatively outer side in the width direction fixed to the outer surface of the shorts 30 is used as the wing forming region 12.

  The hip hold forming region 13 is a region that covers the heel portion in the shorts 30 when the napkin rear portion is mounted, and is stretched in the rear portion from the gather forming region 11 and the wing forming region 12 to which the stretchability described in detail later is given. It is an area where no sex is given.

  In the sanitary napkin 1, due to the above-described configuration, the side edges of the side flaps 10 are formed in a substantially linear shape along the longitudinal direction of the napkin. Regardless of the body shape or the like, the mounting position in the front-rear direction can be mounted at any position that fits the user's body. As described above, in the sanitary napkin 1, each part constitutes the three-dimensional gather BS, the wing-shaped flap W, and the hip-hold flap HF according to the position attached to the shorts 30. Regardless of the body shape, etc., it can be easily mounted at an appropriate position, and the wearability is improved, so that the body can be fitted to prevent leakage.

  Moreover, since the loop-shaped hollow three-dimensional gather BS is formed in the crotch portion by the side flap 10, when the side flap 10 extending laterally from the crotch portion of the shorts 30 is folded back to the non-skin side. By adjusting the size, it is possible to arbitrarily adjust the size of the hollow portion of the three-dimensional gather BS. Further, even if the absorbent 4 around the legs is twisted when worn, the gap between the shorts 30 and the skin in the twisted portion is filled with the hollow three-dimensional gather BS, so that side leakage can be prevented more reliably. become able to.

  As shown in FIG. 1, the side flap 10 preferably imparts stretchability to the longitudinal direction of the sanitary napkin 1 at least at the crotch portion. In order to impart stretchability to the side flaps 10, stretch or contraction of one or both of the liquid-impermeable back sheet 2 and the side nonwoven fabric 7, for example, a stretchable film, nonwoven fabric, urethane foam, or the like, processed into a sheet shape. It can be formed by forming an elastic sheet or by arranging an elastic elastic member between the liquid-impermeable back sheet 2 and the side nonwoven fabric 7 along the longitudinal direction of the napkin. By imparting stretchability, when the loop-shaped three-dimensional gather BS is formed by folding a portion extending laterally from the crotch portion of the shorts 30 to the non-skin side at the time of wearing, the side flap 10 contracted in the longitudinal direction is formed. This makes it easier to fit around the legs and reliably prevents leakage.

  The range to which the stretchability is imparted is preferably a longitudinal range from a position substantially coincident with the front end of the absorbent body 4 to a position where the rear of the crotch portion of the shorts 30 is applied. Moreover, it is preferable to provide stretchability over almost the entire width of the side flap 10 in the napkin width direction. The range to which the stretchability is imparted constitutes the gather formation region 11 and the wing formation region 12 described above.

  The side flaps 10 are preferably set so that the gathering region 11 is more elastic than the wing forming region 12 at least in the crotch region. That is, with respect to the width direction of the side flap 10, a relatively strong stretching force is applied on the inner side, and a relatively weak stretching force is applied on the outer side. As a result, the gather formation region 11 is contracted in the longitudinal direction, so that the three-dimensional gather BS can be easily adhered to the periphery of the leg, and more reliably prevent leakage, and no excessive stretching force is generated in the wing formation region 12. Moreover, it becomes easy to fix to the outer surface of the shorts 30.

  In order to adjust the stretching force, when the side flap 10 is made of the stretchable sheet and the stretchability is imparted, the basis weight of the adhesive between the liquid-impermeable back sheet 2 and the side nonwoven fabric 7 is increased. By providing the expansion / contraction weakening treatment area, the expansion / contraction force of the elastic sheet can be reduced, and conversely, the expansion / contraction force can be increased by lowering the basis weight of the adhesive. In addition, when elasticity is imparted by the elastic elastic member, the elastic force can be reduced by increasing the pitch of the elastic elastic member or by lowering the tension at the time of fixing the elastic elastic member. The stretching force can be increased by reducing the pitch or increasing the tension.

  Further, as shown in FIG. 1, the side flap 10 is provided with a plurality of elastic elastic members 14, 14... At least in the crotch portion along the napkin longitudinal direction and spaced apart in the width direction. It is preferable that stretchability is imparted in the longitudinal direction of the napkin, and the gather forming region 11 is set so that the pitch of the elastic stretch members 14 and 14 is narrower than the wing forming region 12. Thereby, in the gather formation area 11 where the pitch of the elastic elastic members 14 is relatively small, when the hollow loop-shaped three-dimensional gather BS is formed, the side nonwoven fabric 7 stands on the skin side starting from the elastic elastic members 14. The cross section of the elastic stretchable member 14 is likely to be formed into a loop-like curved shape. In addition, since the elastic elastic members 14 are arranged at a fine pitch, the gather formation region 11 standing on the skin side can easily fit the skin surface along the legs. On the other hand, in the wing formation region 12 in which the arrangement pitch of the elastic expansion / contraction members 14 is relatively large, there are few standing start points on the skin side, so that the portion that becomes the wing-shaped flap W can easily be along the non-skin side of the shorts 30. When the side flaps 10 extending from the crotch portion of the shorts 30 extend along the legs and the shorts 30, the uncomfortable feeling around the legs is reduced. As described above, by providing two regions having different pitches of the elastic elastic members 14, the gather forming region 11 can easily serve as the three-dimensional gather BS, and the wing forming region 12 can serve as the wing-shaped flap W. It becomes.

  The pitch of the elastic elastic members 14 is 3 to 7 mm, preferably about 5 mm in the gathering region 11, and 5 to 15 mm, preferably about 10 mm in the wing forming region 12. Further, the elongation rate when fixing the elastic elastic member 14 is 170 to 210% (1.7 times) when the natural length is 100% with respect to the product length of 30 to 40 cm (preferably about 36 cm), for example. ~ 2.1 times), preferably about 190% (about 1.9 times).

  On the other hand, it is preferable that the hip hold forming region 13 does not impart stretchability. The fact that the stretchability is not imparted means that the stretchability is significantly reduced as compared with the gather formation region 11 and the wing formation region 12 to which the stretchability is imparted, and the material itself has some stretchability. It doesn't matter. Further, the majority of the hip hold forming region 13 is not stretchable, and the elastic stretch member extending from the gather forming region 11 and the wing forming region 12 is slightly stretched at the front end portion. It does not matter if the sex is given. Further, when either one or both of the liquid-impervious back sheet 2 and the side nonwoven fabric 7 is formed of an elastic sheet, the expansion and contraction is performed by applying the above-described expansion / contraction weakening process to almost the entire hip hold forming region 13. In the case where the elastic elastic member 14 is disposed, the elastic elastic member 14 is not fixed in the hip hold forming region 13 or the elastic elastic member 14 is cut finely to make the elastic property. You may make it not give.

  In the sanitary napkin 1, as shown in FIG. 1, in the wing formation region 12, the stretchability in the napkin longitudinal direction is not given to the rear portion of the crotch portion that hits the rear of the crotch portion of the shorts 30 in the mounted state. A non-stretchable region 15 can be provided. Since the rear of the crotch portion of the shorts 30 is located at or near the non-stretchable region 15, the occurrence of twisting and wrinkling of the hip hold forming region 13 provided behind the wing forming region 12 can be prevented. It becomes possible to cope with the spread of the buttocks from 30 crotch portions. The non-stretchable region 15 is formed by separating or finely cutting the elastic stretchable member 14. The non-stretchable region 15 is preferably formed by gradually increasing the length in the longitudinal direction toward the outer side in the width direction of the wing forming region 12, so that twisting and wrinkles on the side edge in the width direction can be more effectively suppressed. .

  As shown in FIG. 1, it is preferable to provide shift preventing means 16, 16... For fixing to the outer surface of the shorts 30 on the surface of the side flap 10 on the liquid-impermeable back sheet 2 side. As the displacement preventing means, an adhesive layer such as hot melt or a mechanical joining means such as a mechanical fastener can be used. The misalignment stopping means 16 can be provided in a stretched region, but it can be firmly fixed to the shorts 30 and, in order to prevent adhesion between the adhesive layers, It is preferable to provide it in a region where elasticity is not imparted. It is preferable that a plurality of the shift preventing means 16 are provided on the outer side in the width direction of the side flap 10 so as to be spaced apart in the longitudinal direction. In the illustrated example, an anti-displacement pressure-sensitive adhesive layer 16 is disposed in three areas that are not provided with stretchability at three positions in front of the wing forming area 12 and behind the non-stretchable area 15 and the hip hold forming area 13.

  Further, in the sanitary napkin 1, as shown in FIG. 5, a plurality of embossed portions 17, 17... May be provided on the outer side in the width direction of the side flap 10 at intervals in the napkin longitudinal direction. Good. The embossed portion 17 is used as a guide when the embossed portion 17 is touched by hand to check whether the side flap 10 is mounted in a predetermined state. The embossed portion 17 may be formed so as to bulge to the side nonwoven fabric 7 side, or may be formed to bulge to the liquid-impermeable back sheet 2 side.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Encapsulating sheet, 7 ... Side nonwoven fabric, 10 ... Side flap, 11 ... Gather formation area , 12 ... Wing forming area, 13 ... Hip hold forming area, 14 ... Elastic stretchable member, 15 ... Non-stretchable area, 16 ... Deviation prevention means, 17 ... Embossed portion

Claims (7)

In the absorbent article in which the absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and the side nonwoven fabric is provided along the longitudinal direction on both sides of the surface side,
A side flap is formed by extending the back sheet and the side nonwoven fabric to the side of the absorbent body over the entire length of the absorbent article, and the edge of the side flap is along the longitudinal direction of the absorbent article. Formed in a straight line,
The side flap is a three-dimensional gather in which the widthwise inner side part of the crotch part is a loop-shaped three-dimensional gathering in a wearing state in which a part extending laterally from the crotch part of the shorts is folded back to the non-skin side and fixed to the outer surface of the shorts A hip-holding flap that is a gather forming region that constitutes a part of the crotch portion, a wing forming region that constitutes a wing-shaped flap in the widthwise outer side portion of the crotch portion, and a rear portion that covers the buttocks in the shorts An absorbent article, characterized in that it is a hip-hold forming region that constitutes the body.   The absorbent article according to claim 1, wherein the side flaps are provided with stretchability in the longitudinal direction of the absorbent article at least in the crotch region.   The side flaps are arranged at least in the crotch portion along the longitudinal direction of the absorbent article and spaced apart in the width direction, and a plurality of elastic elastic members are disposed, and the pitch of the elastic elastic members is greater than the gathers from the wing forming region. The absorbent article according to claim 1, wherein the formation region is set smaller.   The absorptive article according to any one of claims 1 to 3 in which elasticity is not given to said hip hold formation field.   The absorbent article according to any one of claims 1 to 4, wherein a non-stretchable region to which stretchability is not imparted is provided in a rear portion of a crotch portion that hits the rear of a crotch portion of shorts in the mounted state in the wing forming region. .   The absorbent article in any one of Claims 1-5 by which the slip prevention means for fixing to shorts is provided in the surface at the said back surface sheet side of the said side part flap.   The absorbent article according to any one of claims 1 to 6, wherein a plurality of embossed portions are provided on the outer side in the width direction of the side flaps at intervals in the longitudinal direction of the absorbent article.

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