JP2014124285A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article, which can be stably fixed to underwear by preventing slippage of a wing-like flap in wearing even in the case of reducing the area of a wing slippage stopping adhesive layer provided on the wing-like flap.SOLUTION: The area of a wing slippage stopping adhesive layer 16 is 5-20% of that of a wing-like flap W, and the wing-like flap W is an asymmetric shape about the width direction line passing the outer end part Wa between the front and the back. The wing-like flap W has an overlapping part 22 where the tip parts of the wing-like flap W overlap each other in the state of being folded up to catch a crotch part of underwear in wearing, and the wing slippage stopping adhesive layer 16 is provided within a range enclosed by the width direction line S1 passing the front end part of the overlapping part 22 and width direction line S2 passing the rear end part thereof. The contour line of the wing-like flap W is formed to be substantially like a circular-arc at least in the overlapping part 22.

Description

  The present invention includes a wing-shaped flap that is used so as to be wound around the crotch portion of the underwear when being fixed to the underwear, and a wing for preventing a slippage in a mounted state on the underwear contact surface of the wing-shaped flap. The present invention relates to an absorbent article in which a slip prevention adhesive layer is formed.

  Conventionally, as an absorbent article N such as a sanitary napkin, a panty liner, a cage sheet, an incontinence pad, for example, as shown in FIG. 10 and FIG. An absorbent body 52 made of cotton-like pulp or the like is interposed between the back sheet 50 and a liquid-permeable surface sheet 51 made of a nonwoven fabric or a permeable plastic sheet, and extends outward on both sides of the main body. An existing wing-shaped flap W, W is integrally formed. As shown in FIG. 10, the planar shape of the wing-shaped flap W is generally distributed in a trapezoidal shape whose longitudinal length is reduced on the outer side.

  As this type of absorbent article N, in order to prevent misalignment in the mounted state, for example, one or more main body misalignments are formed on the non-skin contact surface side of the main body portion (the outer surface of the liquid-impermeable back sheet 50). There is one in which the stop adhesive layers 53, 53 are formed, and the wing-slap adhesive layers 54, 54 are formed on the surface (outer surface) of the wing-shaped flaps W, W on the liquid-impermeable back sheet 50 side.

  When the absorbent article N is fixed to the underwear, as shown in FIG. 12, the absorbent article N is locally applied, and the wing-shaped flaps W, W protruding laterally are taken out from the underwear, and both wings are The flaps W, W are folded at the folding lines RL, RL, and are adhered to the outer surface of the crotch portion of the underwear while the crotch portion of the underwear is wound.

  In order to fix such an undergarment, various types have been developed that prevent displacement during wearing or that can be stably fixed. For example, in the following Patent Document 1, a pair of wings are formed so that at least a part of each pair can be polymerized with each other when the absorbent article is mounted, and a male member of a mechanical hook is formed on the non-skin contact surface of one wing. Is disclosed, and the skin contact surface side of the other wing is disclosed so that the male member can be engaged and fastened during wing polymerization.

  Moreover, in patent document 2 below, the portion having the largest wing length in the longitudinal direction is located away from the side edge of the absorbent main body, and the root of the wing (the portion close to the side edge of the absorbent main body) is constricted ( Absorbent articles are disclosed.

  Furthermore, in the following Patent Document 3, each of the pair of wing parts includes a front part and a rear part with a fixed part center line dividing the length of the fixed part (wings prevention adhesive layer) into two in the longitudinal direction of the absorbent article. An absorbent article is disclosed in which the area of the rear part is smaller than the area of the front part when divided into parts.

JP 9-299397 A JP 2012-157441 A JP 2008-12097 A

  However, in the absorbent article described in Patent Document 1, the structure is such that the wing-shaped flap itself is not directly fixed to the underwear, only by being fixed with a mechanical hook at a portion where the wing-shaped flaps are superposed at the time of wearing. There was a problem that the property article was easily displaced with respect to the underwear.

  Further, in the absorbent article described in Patent Document 2, in order to firmly fix the wing-shaped flap to the underwear, the portion having the largest longitudinal length of the wing-shaped flap is formed at a position away from the side edge of the absorbent main body. In addition, the adhesive layer is provided on almost the entire surface of the portion having the largest longitudinal length. Thus, conventionally, peeling has been prevented by increasing the area of the pressure-sensitive adhesive layer. For this reason, the wing-shaped flap is affected by a wider range of body movement, and the movement of the wing-shaped flap itself is increased. There was a drawback that it was easy to come off. In addition, since the wing-shaped flap and the anti-displacement adhesive layer are provided in a relatively large area, the material cost increases and the wing-shaped flap is likely to be broken or wrinkled during the mounting operation. There was also a problem that it was difficult to carry out the mounting work because it was easy to cause adhesion or mis-adhesion between the agent layers.

  Further, detachment from the underwear of the wing-shaped flap during wearing is likely to occur from the tip of the wing-shaped flap, and particularly described in the wing-shaped flap formed in a trapezoidal shape as shown in FIG. In the case of a wing-shaped flap in which the part with the longest wing longitudinal length is formed away from the main body, the outer edge of the width direction edge is connected to the outer edge of the front edge or the rear edge. There was a problem that the wing-shaped flaps were easily turned over from the corners. Regarding the turning of the wing-shaped flap, in Patent Document 3 described above, a predetermined wing shape is used in order to prevent the wing-shaped flap from being turned from the rear side, but the turning from the wing tip is not considered.

  Here, if the size of the wings prevention adhesive layer can be reduced, the fixed part is not easily affected by the movement of the body, it is easy to maintain the fixed state, the material is saved, and the mounting work is easy. Although it can be expected, simply reducing the size of the adhesive layer for preventing wings will naturally turn the end of the wing-shaped flap, and it will easily come off from the underwear. For this reason, conventionally, the reduction of the area of the adhesive layer for preventing wings was hardly considered.

  Therefore, the main problem of the present invention is that even if the area of the wings-stopping adhesive layer provided in the wing-shaped flap is reduced, it is possible to prevent the displacement during wearing of the wing-shaped flap and to fix it stably to the underwear. It is to provide an absorbent article.

In order to solve the above-mentioned problem, as the present invention according to claim 1, underwear is attached to each of both side portions of the main body portion where the absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet. A wing-shaped flap that is fixed so as to entrain the crotch portion is formed, a main body slip-preventing adhesive layer is formed on the surface of the main body portion on the liquid-impervious back sheet side, and the wing-shaped flap is impervious. In an absorbent article in which a wings prevention adhesive layer is formed on the surface of the liquid back sheet side,
The area of the wings-stopping adhesive layer is 5 to 20% of the area of the wing-shaped flap,
The wing-shaped flap has an asymmetric shape between the front side and the rear side of the width direction line passing through the outer side end of the wing-shaped flap,
When the wing-shaped flap is folded so as to involve the crotch portion of the underwear when worn, the wing-shaped flap has an overlapping portion where the tip portions of the wing-shaped flap overlap each other,
The wings-stop adhesive layer is provided in a range surrounded by a width direction line passing through the front end portion of the overlapping portion and a width direction line passing through the rear end portion,
An absorbent article is provided in which the outline of the wing-shaped flap has a substantially arc shape at least in the overlapping portion.

  The invention described in claim 1 is characterized in that the area of the wings-stopping adhesive layer is considerably smaller than 5 to 20% of the area of the wing-shaped flap, and even in this case, the following configuration Is provided so that the wing-shaped flap can be prevented from slipping while being mounted, and can be stably fixed to the underwear.

  As the wing-shaped flap, one having an asymmetric shape between the front side and the rear side of the width direction line passing through the outer side end portion of the wing-shaped flap is used. This is to make it possible to easily fold and stick the sheet properly at the normal folding position without causing problems such as adhesion or erroneous adhesion between the wings-stopping adhesive layers during the mounting operation.

  In addition, the wing-shaped flap has an overlapping portion where the tip portions of the wing-shaped flap overlap each other when the wing-shaped flap is folded so that the crotch portion of the underwear is rolled up. Since detachment from the underwear of the wing-shaped flap during installation is likely to occur from the tip of the wing-shaped flap, by providing the overlapping portion at the tip of the wing-shaped flap, the other wing on the surface side of one wing-shaped flap Since the tip of the wing-shaped flap overlaps and the tip of the wing-shaped flap that is at least the inner side is not exposed to the outside in this overlapped portion, it is possible to prevent curling during wearing. Also, the other wing-shaped flap on the outer side is directly affected by the wrinkles of the underwear as compared with the case where it is provided so as to be in direct contact with the underwear because the tip part overlaps the outer surface side of the one wing-shaped flap. It is difficult to maintain the overlapping state stably.

  Further, since the wings prevention adhesive layer is provided within a range surrounded by a width direction line passing through the front end portion of the overlap portion and a width direction line passing through the rear end portion, the vicinity of the overlap portion is an underwear. And the overlapping state of the overlapping portions can be easily maintained. As a result, it is possible to prevent the wings-stopping adhesive layer from peeling off at the initial movement when the wing-shaped flap comes off the underwear, and the area of the wings-stopping adhesive layer can be kept within the minimum necessary range, thereby reducing the area. Can be planned.

  In addition, since the outline of the wing-shaped flap is formed in a substantially arc shape at least in the overlapping portion, it is difficult to form a corner portion as a turning point at the tip of the wing-shaped flap in the mounted state. Peeling can be prevented. In addition, after folding the wing-shaped flap around the crotch part of the underwear and then curving the absorbent article along the roundness in the front-rear direction of the body, the wing-shaped flap is relative to the front-rear direction of the absorbent article. Since it is in a curved state protruding outward, it is curved so that the tip of the wing-shaped flap is in close contact with the underwear side, and it is difficult for floating from the underwear to occur. On the other hand, in the case of a wing-shaped flap that is formed in a trapezoidal shape like a conventional wing-shaped flap, the corner at the tip tends to float from the underwear. Often deviated from.

  As the present invention according to claim 2, there is provided an absorbent article according to claim 1, wherein the maximum width of the overlapping portion is 10 mm or more.

  In the second aspect of the invention, the overlapping portion is provided with a maximum width of 10 mm or more in order to clearly demonstrate the effect of the overlapping portion.

  The present invention according to claim 3 provides the absorbent article according to any one of claims 1 and 2, wherein the area of the overlapping portion is 10 to 25% of the area of the wing-shaped flap.

  In the third aspect of the invention, the size of the overlapping portion is defined from the viewpoint of the area ratio with respect to the area of the wing-shaped flap, and is set to 10 to 25% of the area of the wing-shaped flap.

  According to a fourth aspect of the present invention, the adhesive layer for preventing wing slippage is arranged with a separation distance of 20 mm or more in the width direction from the outer side end portion of the wing-shaped flap. An absorbent article as described above is provided.

  In the invention of claim 4, the position in the width direction of the wings-stopping adhesive layer is specified, and from the outer side end portion of the wing-shaped flap so that the adhesive layer does not overlap at the overlapping portion at the time of wearing. The separation distance in the width direction is set to 20 mm or more.

  As this invention which concerns on Claim 5, the said wings prevention adhesive layer is the width direction line which passes along the center part of this wings prevention adhesive layer, and the width direction line which passes the outer side edge part of the said wing-shaped flap, The absorbent article according to any one of claims 1 to 4, wherein the absorbent article is disposed at substantially the same position.

  In the invention of claim 5, the width passing through the center of the wings-stopping adhesive layer is defined in order to determine the position of the wings-stopping adhesive layer in the longitudinal direction and to prevent the tip of the wing-shaped flap from turning up. The direction line and the width direction line passing through the outer side end of the wing-shaped flap are arranged so as to substantially coincide with each other.

  As the present invention according to claim 6, the wing-shaped flap has a front outline extending outward from the main body portion and a rear outline extending outward from the main portion, and the width direction line of the absorbent article The angle formed by the width direction line of the absorbent article and the rear outer shape line is set larger than the angle formed by the front outer shape line and the front outer shape line, and the center of gravity of the wing-shaped flap is the base of the wing-shaped flap and the main body portion. An absorbent article according to any one of claims 1 to 5, wherein the absorbent article is biased to the front side of the center of the joint line.

  In the invention described in claim 6, a specific structure is defined when the wing-shaped flap is asymmetrical in the front-rear direction.

  As the present invention according to claim 7, there is provided an absorbent article according to any one of claims 1 to 6, wherein at least an outer side end portion of the wing-shaped flap and its vicinity are embossed.

  In the invention of claim 7, by embossing at least the outer side end of the wing-shaped flap and its vicinity, the predetermined range of the overlapping portion becomes an embossing region. In addition, the tip of the wing-shaped flap can be prevented from flickering.

  As the present invention according to claim 8, the emboss is provided so as to substantially follow the outline of the wing-shaped flap, and the area of the embossed region is 55% or more of the area of the wing-shaped flap. Item 7. An absorbent article according to Item 7, is provided.

  In the invention described in claim 8, in order to prevent the entire outline of the wing-shaped flap from being flickered, embossing is performed substantially along the outline of the wing-shaped flap, and the embossed region is The area is set to be 55% or more of the area of the wing-shaped flap.

  As described above in detail, according to the present invention, even if the area of the wings-stopping adhesive layer provided in the wing-shaped flap is reduced, it is possible to prevent the shift during wearing of the wing-shaped flap and to stably fix the underwear. become.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. FIG. It is the III-III arrow directional view of FIG. It is a principal part enlarged plan view of the wing-shaped flap W. FIG. It is the top view seen from the shorts outer surface which shows the fixed state to the shorts of the wing-like flap W. It is a principal part enlarged plan view of the wing-shaped flap W which concerns on the other example of a form. It is a principal part enlarged plan view of the wing-shaped flap W. FIG. It is a top view which shows the folding procedure of the wing-shaped flaps W and W. FIG. It is the cross-sectional view (the IX-IX arrow directional view of FIG. 8). It is an expanded view of the conventional sanitary napkin N. It is the cross-sectional view (XI-XI line arrow view of FIG. 10). FIG.

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

<< Structural example of sanitary napkin 1 >>
The sanitary napkin 1 according to the present invention includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc., a liquid-permeable top sheet 3 that allows permeation of menstrual blood or vaginal discharge, and the both sheets 2. , 3, an absorbent body 4 made of cotton-like pulp or synthetic pulp, crepe paper 5 surrounding the absorbent body 4 for maintaining the shape of the absorbent body 4 and improving diffusibility, and both sides of the surface The side nonwoven fabrics 7 and 7 are respectively formed along the longitudinal direction. Around the absorber 4, at the upper and lower edge portions, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious back sheet 2 and the side nonwoven fabric 7 that extend laterally from the absorbent body 4 at both side edges thereof are bonded to each other by an adhesive such as hot melt or an adhesive means such as heat seal. Has been.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

  As the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. In addition, 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 bodily fluids and increase absorption efficiency.

  The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved 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. When the crepe paper 5 surrounding the absorbent body 4 is provided as in this example, the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. The crepe paper 5 which is excellent in diffusing body fluids quickly prevents reversal of menstrual blood and the like.

  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 also 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.

  On the other hand, side non-woven fabrics 7 and 7 are provided on both sides of the sanitary napkin 1 along the longitudinal direction and almost the entire length of the napkin 1, respectively. Wing-like flaps W, W are formed by a part of the liquid-impervious back sheet 2 that extends sideways and also extends sideways. The wing-shaped flap W will be described in detail later.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic The hydrophilic treatment nonwoven fabric which gave is used.

  As shown in FIG. 2, the non-skin contact surface of the main body part in which the absorbent body 4 is interposed between the liquid-permeable top sheet 3 and the liquid-impervious back sheet 2 is for fixing to the underwear. A plurality of main body displacement preventing adhesive layers 17, 17... In the illustrated example are formed by an appropriate application pattern, and the main body displacement preventing adhesive layers 17, 17. Covered by. Further, a wings prevention adhesive layer 16 is formed on the surface of the wing-shaped flaps W, W on the liquid-impermeable back sheet 2 side, and the wings prevention adhesive layers 16 and 16 are peeled off for wings. Covered by a material 18. The wings prevention adhesive layer 16 will be described in detail later.

  The release materials 18 and 19 are formed by joining the release material 19 for the main body and the release material 18 for the wing arranged in the transverse direction at the intersection, or individually attaching the release material 19 for the main body and the release material 18 for the wing, respectively. It is desirable to adhere to (not shown) and to be able to remove both release materials 18 and 19 with a single peeling effort. Further, the release material may be configured to cover the main body anti-adhesion layer 17 and the wing anti-adhesion layer 16 with one substantially cross-shaped release material. The wing-shaped flaps W, W are so-called belly folds that fold to the liquid-permeable surface sheet 3 side together with the wing release material 18 in the individual packaging state.

  As the pressure-sensitive adhesive that forms the anti-displacement pressure-sensitive adhesive layers 16 and 17, for example, a styrenic polymer, a tackifier, or a plasticizer that is a main component is preferably used. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, styrene-isobutylene-styrene copolymers, styrene-butadiene-styrene block copolymers, and the like. However, only one of these may be used, or two or more polymer blends may be used. Among these, a styrene-butadiene-styrene block copolymer is preferable in terms of good thermal stability. As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, etc., and examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate, dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.

  On the other hand, as the release materials 18 and 19, a release treatment liquid such as a silicone resin, a fluorine resin, or a tetrafluoroethylene resin is applied to the contact surfaces with respect to the slip prevention adhesive layers 16 and 17, for example. Paper, non-woven fabric, or plastic sheet that has been processed or spray-coated and release-treated can be used.

  The wing release material 18 is disposed up to a position where the edge on the front side of the napkin extends to the front side of the wing-shaped flap W, and the edge on the rear side of the napkin is a wing shape slightly rearward of the wings-stopping adhesive layer 16. It is arranged up to the middle position of the flap W. Further, both side portions on the front side of the napkin are cut along the outline of the sanitary napkin 1.

  The wing release material 18 and the main body release material 19 cannot be peeled off by a bonding means such as a hot-melt adhesive or heat seal at the fixing portions 20, 20... It is fixed. In the illustrated example, the adhering portion 20 is provided over three strips at a position overlapping the main body anti-adhesive adhesive layers 17, 17... And in a range overlapping the wing anti-adhesive adhesive layer 16 in the napkin width direction. It has been.

<< Wing-shaped flap W and Wings prevention adhesive layer 16 >>
In the sanitary napkin 1, by defining the configuration of the wing-shaped flap W and the wings-stopping adhesive layer 16, the wing-shaped flap W can be attached even when the area of the wings-stopping adhesive layer 16 is reduced. Misalignment can be prevented, and it can be stably fixed to the underwear.

  The wing-shaped flap W has an asymmetric shape between the front side and the rear side of the width direction line S4 passing through the outer side end Wa of the wing-shaped flap W, and at least a part of the outer shape line is a wavy line or a curve. Or it forms with the uneven | corrugated curve made into these combinations. As shown in FIG. 2, a wings-stopping adhesive layer 16 is formed on the surface of the wing-shaped flap W on the liquid-impervious back sheet 2 side.

  As shown in detail in FIG. 4, the wing-shaped flap W includes a front outline 10 extending outward from the main body portion, a rear outline 11 extending outward from the main portion, and the front outline 10. And an outer shape composed of a front end side outline 12 connecting the rear outline 11. And at least a part of these outlines is a wavy line, a curve, or a combination thereof. Preferably, at least one of the front outline 10 or the rear outline 11 is a wavy line or a curve or a combination thereof, and in the illustrated example, both the front outline 10 and the rear outline 11 are a convex curve and a concave curve. Are wavy lines formed alternately.

  In the sanitary napkin 1, the shape of the wing-shaped flap W is greater than the angle α formed by the width direction line of the sanitary napkin 1 and the front outer shape line 10. The angle β formed with the rear outline 11 is set larger, and the center of gravity 13 of the wing-shaped flap W is from the center point 14 of the joint line 15 (fold line RL) between the base of the wing-shaped flap W and the main body portion. Is also biased forward by ΔS. The front outline 10, the rear outline 11, and the tip outline 12 do not have to be all wavy lines, curves, or a combination thereof, and some of them may be straight. However, as described in detail later, the outline of the predetermined section needs to be formed in a predetermined arc shape. When the front outline 10 and the rear outline 11 are wavy lines, curves, or a combination thereof, the angles α and β may be gradients formed by the center lines of these wavy or curved outlines.

  The angle α formed between the width direction line of the sanitary napkin 1 and the front outer shape line 10 is about 0 to 20 °, and the angle β formed between the width direction line of the sanitary napkin 1 and the rear outer shape line 11. Is preferably about 30 to 45 °. In this case, the angle α formed by the width direction line of the sanitary napkin 1 and the front side outline 10, the width direction line of the sanitary napkin 1 and the rear side The angle difference with the angle β formed with the outline 11 is preferably 15 ° or more. If this angle difference is 15 ° or more, a sufficient eccentric distance ΔS can be secured, and when the wing-shaped flap W is folded back, even if the wing-shaped flap is folded back by hand while moving the hand forward, it is tight. It will be able to be worn in a normal state.

  As shown in FIG. 5, the wing-shaped flap W has an overlapping portion 22 in which the tip portions of the wing-shaped flap W overlap each other with a certain amount of width when folded so that the crotch portion of the underwear is wound when worn. It is formed to have. For this purpose, the protruding length L of the wing-shaped flap W is 48 mm or more, preferably 50 to 58 mm. The length of the base end portion of the wing-shaped flap W in the napkin longitudinal direction is preferably 80 mm or less so as to fit in the crotch of the underwear.

  Generally, detachment from the underwear of the wing-shaped flap during wearing tends to occur from the front end side of the wing-shaped flap. For this reason, in the sanitary napkin 1, even if the area of the wing-slipping adhesive layer 16 is reduced by arranging the wings-slipping adhesive layer 16 near the tip of the wing-shaped flap W, the wing-shaped flap W This prevents the adhesive layer 16 from peeling off the wings when the first movement is released from the underwear.

  As shown in FIG. 5, the range in which the wings prevention adhesive layer 16 is disposed is surrounded by a width direction line S1 passing through the front end portion of the overlapping portion 22 and a width direction line S2 passing through the rear end portion. Within the specified range. Thereby, the vicinity of the overlapping portion 22 is fixed to the underwear, and the overlapping state of the overlapping portion 22 is easily maintained. As a result, the wings-stopping adhesive layer 16 can be prevented from being peeled off from the underwear 30, and the wings-stopping adhesive can be prevented. The adhesive layer 16 is contained within the minimum necessary range, and the area of the adhesive layer can be made as small as possible.

  The outline of the wing-shaped flap W has a substantially arc shape constituted by a composite arc (pseudo arc shape) in which a single arc or an arc having a plurality of curvature radii is combined at least in the overlapping portion 22. That is, at least the overlapping portion 22 does not have a straight line portion and is formed in a generally smooth arc shape. As shown in FIG. 5, the planar shape of the overlapping portion 22 composed of such outlines is a deformed ellipse in which the curves protruding on both sides intersect at the upper and lower ends, and approximates the so-called cross-sectional shape of a meteorite. doing. The overlapping portion 22 is preferably formed in a shape that is long in the napkin longitudinal direction, and a shape that is long in the napkin width direction is not preferable.

  Thereby, since the corner | angular part used as the base point of turning is not formed, peeling from underwear can be prevented. In addition, after folding the wing-shaped flap W so that the crotch portion of the underwear is wound, the wing-shaped flap W is formed in the state where the sanitary napkin 1 is curved along the roundness in the front-rear direction of the body. Since it is in a curved state protruding outward in the front-rear direction, if the tip part is formed in an arc shape in this state, the tip part of the wing-shaped flap W is in close contact with the underwear side, and floating or turning up from the underwear No longer occurs. On the other hand, when it is formed in a trapezoidal shape with a corner like the conventional wing-shaped flap W, it is easy to float from the underwear even when the crotch portion is folded and folded and curved in the front-rear direction. It was often the starting point for turning.

  The maximum width B of the overlapping portion 22 is preferably 10 mm or more so that the effect of providing the overlapping portion 22 is clearly exhibited. If the maximum width B is less than 10 mm, the overlapping state between the tip portions is not sufficient, and the overlapping state is released when the tip portion of the wing-shaped flap W located on the underwear side is deformed by the twist of the underwear or the like. There is a risk of turning over. The maximum width B of the overlapping portion 22 is the width of the portion where the width of the left and right wing-shaped flaps W, W in the napkin width direction between the outer lines of the left and right wings is maximum.

  The maximum width B of the overlapping portion 22 is 10 to 20 mm, preferably 14 to 16 mm. On the other hand, the maximum length D (length in the napkin longitudinal direction) of the overlapping portion 22 is 25 to 30 mm, preferably 27 to 28 mm. The area of the overlapping portion 22 is 10 to 25%, preferably 15 to 18% of the area of one wing-shaped flap W. The size of the overlapping portion 22 can be arbitrarily set within the above prescribed range because there are individual differences depending on the position where the wing-shaped flap W is folded back and the body shape. For example, as shown in FIG. 5, the outer line of the wing-shaped flap W on one side is the outer side end Wa of the wing-shaped flap W on the other side and the outer side end 16 a of the wingsling prevention adhesive layer 16. 6, and as shown in FIG. 6, the outer line of the wing-shaped flap W on the one side is the outer end of the wing-slipping adhesive layer 16 on the other side, as shown in FIG. 6. You may form so that it may adjoin to 16a.

  On the other hand, the area of the wings-stopping adhesive layer 16 is 5 to 20%, preferably 5 to 17%, more preferably 6 to 9% of the area of one wing-shaped flap W, compared to a normal one. It is set small. In the example shown in the figure, it is 7.2%. The area of the wing-shaped flap W connects the base end portion where the front outer shape line 10 of the wing-shaped flap W extends outward from the main body portion and the base end portion where the rear outer shape line 11 extends outward from the main body portion. It is the area of the part that extends outward from the bar.

  The arrangement position of the wings-stopping adhesive layer 16 in the napkin width direction is such that the outer side end portion Wa of the wing-shaped flap W is not adhered to the wing-shaped flap W on the other side in the overlapping portion 22 at the time of mounting. It is preferable that a predetermined separation distance C is provided in the napkin width direction. Specifically, the separation distance C is set to 20 mm or more, preferably 20 to 30 mm, because the maximum width B of the overlapping portion 22 is 10 to 20 mm.

  Further, as the arrangement position of the wings prevention adhesive layer 16 in the longitudinal direction of the napkin, as shown in FIG. 5, a width direction line S3 passing through the center of the wings prevention adhesive layer 16 and a wing shape Preferably, the flap W is formed at a position where the width direction line S4 passing through the outer side end portion Wa of the flap W substantially coincides. The fact that the two width direction lines S3 and S4 substantially match includes not only the case where the two width direction lines S3 and S4 completely match, but also the case where the two width direction lines S3 and S4 are provided so as to be shifted within a range of 8 mm.

  The planar shape of the wingsleet-stopping adhesive layer 16 is arbitrary, but it is preferably formed in a rectangular shape that is long in the longitudinal direction of the napkin as shown in the illustrated example. The length at this time is within the range of the maximum length D of the overlapping portion 22 as described above, and the width is 5 to 18 mm, preferably 8 to 13 mm.

  In order to more reliably prevent the tip of the wing-shaped flap W from turning up when attached, as shown in FIG. 7, at least the outer end portion Wa of the wing-shaped flap W and its vicinity are embossed. 23 is preferably applied. The embossing 23 is preferably provided along a contour line of the wing-shaped flap W and provided in a predetermined region on the inner side from the contour line of the wing-shaped flap W over substantially the entire periphery of the wing-shaped flap W. The area of the region where the emboss 23 is applied at this time is preferably 55% or more of the area of the wing-shaped flap W. The application range of the emboss 23 at the tip of the wing-shaped flap W is preferably 6 to 25 mm, preferably 8 to 14 mm from the outer side end Wa of the wing-shaped flap W. When the embossing 23 is formed in such a range, as shown in FIG. 5, when the overlapping portion 22 is formed up to the center position of the separation distance C from the tip of the wing-shaped flap W of the wings-stopping adhesive layer 16 When the overlap portion 22 is formed over substantially the entire length of the separation distance C as shown in FIG. 6, almost the entire area (100%) of the overlap portion 22 is an emboss addition region. % Area is set as an emboss addition area.

The emboss pattern of the emboss 23 is preferably a discrete pattern in which a large number of small emboss portions are arranged at intervals, and the planar shape of one emboss portion provided in a discrete manner is circular or elliptical. , Polygons and the like. Further, as the arrangement pattern of the small embossed portions, it can be arranged in a staggered pattern, a lattice shape, or at random. As shown in FIG. 7, a single pattern such as a floral pattern by combining a plurality of embossed portions. It is also possible to arrange them in combination. The size of one embossed portion arranged discretely is 0.2 to 1.8 mm ² , preferably 0.5 to 0.8 mm ² . In the illustrated example, a plurality of floral embosses 25, 25,..., Which are a combination of a plurality of ellipses, are provided for the purpose of reinforcing the rigidity of the central portion of the wing-shaped flap W.

  When the sanitary napkin 1 is individually packaged, the wing-shaped flap W has one wing-shaped flap W winged at a fold line RL set at the base end of the wing-shaped flap W, as shown in FIG. After being folded to the liquid-permeable surface sheet 3 side together with the release material 18 for the liquid, the other wing-shaped flap W is liquid-permeable together with the release material 18 for the wing at the folding line RL set at the base end of the wing-shaped flap W. It is made to fold to the surface sheet 3 side.

  In this case, if the wing-shaped flaps W, W are simply folded to the liquid-permeable surface sheet 3 side, the shape is not stable, and the wing-shaped flaps W, W are lifted or fluttered. And may cause entanglement. Therefore, in order to stabilize the operation, the wing-shaped flap W is held in a state of being folded together with the wing release material 18 on the liquid-permeable surface sheet 3 side. Specifically, as shown in FIGS. 8 and 9, the end portions of the wing-shaped flaps W and W folded on the liquid-permeable surface sheet 3 side overlap each other. In addition, the ends of the wing-shaped flaps W may be temporarily bonded to each other at the overlapping portion (not shown).

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 5 ... Crepe paper, 7 ... Side nonwoven fabric, 16 ... Wings prevention adhesive layer, 17 ... Main body Anti-slip adhesive layer, 22 ... Overlapping part, 23 ... Emboss, W ... Wing flap

Claims (8)

Wing-like flaps are formed on both sides of the body part where the absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet so that the crotch part of the underwear is fixed when worn. The main body part is formed with a main body slip-preventing adhesive layer on the liquid-impervious back sheet side surface, and the wing-shaped flap is formed with a liquid-impervious back sheet side surface. In the absorbent article made,
The area of the wings-stopping adhesive layer is 5 to 20% of the area of the wing-shaped flap,
The wing-shaped flap has an asymmetric shape between the front side and the rear side of the width direction line passing through the outer side end of the wing-shaped flap,
When the wing-shaped flap is folded so as to involve the crotch portion of the underwear when worn, the wing-shaped flap has an overlapping portion where the tip portions of the wing-shaped flap overlap each other,
The wings-stop adhesive layer is provided in a range surrounded by a width direction line passing through the front end portion of the overlapping portion and a width direction line passing through the rear end portion,
The absorbent article, wherein an outer shape line of the wing-shaped flap has a substantially arc shape at least in the overlapping portion.   The absorbent article according to claim 1, wherein the maximum width of the overlapping portion is 10 mm or more.   The absorbent article according to claim 1, wherein an area of the overlapping portion is 10 to 25% of an area of the wing-shaped flap.   The absorbent article according to any one of claims 1 to 3, wherein the wings-stopping adhesive layer is disposed with a separation distance of 20 mm or more in the width direction from an outer side end of the wing-shaped flap.   The wings prevention adhesive layer is disposed at a position where a width direction line passing through a center portion of the wings prevention adhesive layer substantially coincides with a width direction line passing through an outer side end of the wing-shaped flap. The absorbent article according to any one of claims 1 to 4.   The wing-shaped flap has a front outline extending outward from the main body portion and a rear outline extending outward from the main body portion, and an angle formed by the width direction line of the absorbent article and the front outline The angle formed by the width direction line of the absorbent article and the rear outer shape line is set larger, and the center of gravity of the wing-shaped flap is on the front side than the center of the joint line between the base of the wing-shaped flap and the main body portion. The absorbent article according to any one of claims 1 to 5, wherein the absorbent article is biased.   The absorbent article according to any one of claims 1 to 6, wherein an emboss is applied to at least an outer side end portion of the wing-shaped flap and the vicinity thereof.   The absorbent article according to claim 7, wherein the emboss is provided so as to substantially follow an outline of the wing-shaped flap, and an area of the embossed area is 55% or more of an area of the wing-shaped flap.

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