JP2014028000A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an individual package to be opened smoothly without being caught and to prevent twists or wrinkles from forming into wing-like flaps when opened.SOLUTION: A wing lateral shift stop adhesive layer 16 comprises a first area 16A which is relatively long in a sanitary towel width direction and short in a longitudinal direction, and a second area 16B which is positioned outside the first area 16A and is relatively short in the sanitary towel width direction and long in the longitudinal direction. The first area 16A and the second area 16B are provided adjacent with gaps or continuously. By displacing a front end of the first area 16A nearer a sanitary back side than a front end of the second area 16B, an area nearer a front distal end part of a wing-like flap W becomes a non-lateral shift stop area 22 where a wing lateral shift stop adhesive layer 16 is not formed. Thus, in releasing a release material in opening the sanitary towel, even when twists or wrinkles form in the areas nearer the front distal end parts of the wing-like flaps W, the wing lateral shift stop adhesive layers 16 are never stuck together.

Description

  The present invention relates to an absorbent article provided with a wing-shaped flap that is used so as to be wound around a crotch portion of an underwear when being fixed to the underwear.

  Conventionally, as an absorbent article N such as a sanitary napkin, a panty liner, a cage sheet, an incontinence pad, and the like, as shown in FIGS. 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 this type of absorbent article N, in order to prevent misalignment in the mounted state, for example, one or a plurality of adhesives are provided 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 layers 53, 53 are formed and the pressure-sensitive adhesive layers 54, 54 are formed on the surface (outer surface) of the wing-shaped flaps W, W on the liquid-impervious back sheet 50 side.

  When the absorbent article N is fixed to the underwear, as shown in FIG. 14, 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 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.

  On the other hand, when individually packaging the absorbent article N, in the following Patent Document 1, the present applicant provides a wing release material that covers the adhesive layer formed on the wing-shaped flap in the individually packaged product state. The wing-like flap is folded together with the wing release material on the liquid-permeable surface sheet side, and the wing-like release material is fixed to the individual material on the surface of the liquid-impervious back sheet side, and the wing-type flap In the state where the wing-like release material is folded on the liquid-permeable surface sheet side, there is an overlap between the tip portions of the wing-shaped flaps, and a napkin that temporarily fixes the wing-shaped flaps to each other at the overlapping portions. Proposed. In such a napkin, when the individual packaging material is peeled off, the wing-shaped flap is pulled to the back sheet side by the wing release material, and the folded wing-shaped flap is automatically developed.

  Moreover, in the following patent document 2, in the sanitary napkin packaging body, the outer surface of the first release paper covering the adhesive area of the napkin body is joined to the inner surface of the packaging sheet so as not to be peeled, thereby protecting the adhesive area of the wing portion. A sanitary napkin packaging body is disclosed in which the second release paper to be bonded to the packaging sheet and the packaging sheet is joined in a non-peelable manner at a portion extending from one end edge in the longitudinal direction of the napkin body. Such a napkin body is folded in three so that one end edge in the longitudinal direction is on the bottom and the other end is on the top sheet with the top sheet inside.

JP 2004-113590 A Japanese Patent Laid-Open No. 9-10257

  However, in the napkin described in Patent Document 1, since the wing-shaped flap is folded (belly folded) together with the wing release material on the liquid-permeable surface sheet side, when the release material is peeled off from the napkin front end side, FIG. As shown in FIG. 2, the wing-shaped flaps W, W are developed so as to be dragged out by the wing release material. At this time, with the upper end of the fold line RL of the wing-shaped flap W as a base point, a large tensile force acts on the wings-stopping adhesive layer that is a joint between the wing release material and the wing-shaped flap W. Due to this tensile force, the wing-shaped flap W is reversed in the region near the front base end portion of the wing-shaped flap W to cause twists and wrinkles. There was a problem that smooth opening was hindered by being caught at the folded part of the flap. Hereinafter, a region near the front base end portion of the wing-shaped flap W that is easily dragged and wrinkled by the release material at the time of opening is hereinafter referred to as “inversion region”.

  On the other hand, in a region other than the reversal region, the wing-shaped flap is firmly fixed to the underwear and it is necessary to provide an adhesive layer in an appropriate range in order to prevent turning-up at the time of wearing. The turn-up at the time of wearing tends to occur from the front end side of the wing-shaped flap, and in particular, often occurs from a portion having a long width direction length.

  Next, considering the force acting when the folded wing-shaped flap as described in the above-mentioned Patent Document 1 is unfolded at the time of opening, the wing-shaped flap folded in the stomach by peeling off the release material. A tensile force T ′ that pulls the centroid of the wings-stopping adhesive layer diagonally forward and outward from the front end (point P) of the wing base end (folding line) of the release material for use (see FIG. 5). That is, a tensile force T ′ in the diagonally forward and outward direction acts from the centroid of the wings-stopping adhesive layer toward the front end P of the fold line. When this tensile force T ′ is decomposed into a component force Th ′ in the napkin width direction and a component force Tv ′ in the napkin longitudinal direction, the width direction force Th ′ is developed by separating the wing-shaped flap W from the liquid-permeable surface sheet. The longitudinal component force Tv ′ is a force that causes wrinkles and twists at the base end by pulling the wing-shaped flap W forward of the napkin. Although it is difficult to make the longitudinal component force Tv ′ zero, it is possible to improve these component force ratios (longitudinal component force Tv ′ / width direction component force Th ′) to the smallest possible value. It is considered that the wing-shaped flap can be smoothly deployed by arranging the wings-stopping adhesive layer.

  Moreover, in the packaging body of the said patent document 2, since the 2nd release paper which protects the adhesion area of a wing part is joined to the part extended from the longitudinal direction one end edge of a packaging sheet, when peeling a packaging sheet There was a case where I couldn't open it smoothly because I was caught at the end.

  Accordingly, a main problem of the present invention is to provide an absorbent article that can be smoothly opened without being caught from an individual packaging state, and that prevents wing-like flaps and wrinkles from being generated at the time of opening.

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 involve the crotch part is formed,
A main body anti-slip adhesive layer is formed on the liquid-impervious back sheet side surface of the main body part, and a wing anti-slip adhesive layer is formed on the liquid-impervious back sheet side surface of the wing-shaped flap. ,
In the individually packaged product state, the main body anti-slip adhesive layer and the wing anti-slip adhesive layer are integrally covered with a release material, and the wing-shaped flap is a fold line along the longitudinal direction of the absorbent article at the base end In the absorbent article folded together with the release material on the liquid-permeable surface sheet side,
The wings-resisting adhesive layer is positioned relatively on the outside of the first region, the first region having a relatively long width in the width direction and a short length in the longitudinal direction, and relatively absorbent. The first region and the second region are adjacent to each other with a gap therebetween or continuously provided with a second region having a short length in the width direction and a long length in the longitudinal direction. The wings-stop adhesive layer is formed in a region near the front base end portion of the wing-shaped flap by disposing the front end of the region in a position behind the absorbent article from the front end of the second region. An absorbent article is provided which is characterized as a non-displaced region that is not to be displaced.

  In the first aspect of the present invention, as the wings prevention adhesive layer, the absorbent article is relatively long in the width direction length and short in the longitudinal direction, and on the outside of the first area. Whether the absorbent article is composed of a second region having a relatively short width in the width direction and a long length in the longitudinal direction, and the first region and the second region are adjacent to each other with a gap between them. By arranging the front end of the first region closer to the rear side of the absorbent article than the front end of the second region, the front end of the wing-shaped flap is closer to the front base end portion. The region is defined as a non-slipping-stop region where the wings-stopping adhesive layer is not formed. For this reason, when peeling the release material at the time of opening, a large force acts on the fold line portion of the release material that covers the adhesive layer of the wing-shaped flap that is folded in the stomach, and it is closer to the front base end of the wing-shaped flap. Even if creases or wrinkles occur in the reversal area of the wings, this area is used as the non-displacement prevention area, so that the wings prevention adhesive layer does not stick to each other, and the wing-like flaps and Generation | occurrence | production can be prevented, and it can open now smoothly, without catching in the folded part of a wing-shaped flap.

  Further, not only the first region but also a second region in which the front end is shifted to the front side from the front end of the first region is formed not only in the first region, but as the wings-stopping adhesive layer. Therefore, as will be described in detail later, the component force of the longitudinal component Tv and the component force Th of the tensile force T from the centroid of the wings-stopping adhesive layer toward the front end (point P) of the wing base end Since the ratio Tv / Th can be improved to a value smaller than the component force ratio Tv ′ / Th ′ when only the first region is set, the longitudinal component force Tv that does not contribute to the development of the wing-shaped flap is suppressed, and the wing It is possible to increase the ratio of the component force Th in the width direction that greatly affects the development of the flat flap (see FIG. 5). Accordingly, the wing-shaped flap can be easily unfolded, and can be smoothly opened without being caught from the individual packaging state.

  As a second aspect of the present invention, a straight line passing through the front end portion of the first region and the front end portion of the second region is provided so as to intersect substantially at the center of the fold line of the wing-shaped flap. An absorbent article according to claim 1 is provided.

  In the invention described in claim 2, the wings prevention adhesive is such that a straight line passing through the front end portion of the first region and the front end portion of the second region intersects at substantially the center of the fold line of the wing-shaped flap. The agent layer is arranged. Therefore, even if the release material is peeled off to the vicinity of the center of the fold line with the wing-shaped flap folded, the wings-stopping adhesive layers can be prevented from sticking to each other and can be smoothly opened without being caught from the individual packaging state. It becomes like this.

  As the present invention according to claim 3, the non-displacement prevention region is in a range where an angle formed with the fold line is at least 0 to 30 ° around the center of the fold line of the wing-shaped flap, The absorbent article according to any one of claims 1 and 2 provided in a range of 90 ° or less.

  In the invention described in claim 3, in consideration of the range of creases and wrinkles that enter the base end portion of the wing-shaped flap when the release material is peeled off, the range of the non-displacement prevention region where the wings prevention adhesive layer is not formed. Has been decided.

  The absorption according to any one of claims 1 to 3, wherein as the present invention according to claim 4, the first region is substantially square, and the second region is a rectangle elongated in the longitudinal direction of the absorbent article. A sex article is provided.

  In the invention of claim 4 above, it is possible to secure the fixing performance to the underwear without forming a wings-resisting adhesive layer in the reversal region where creases and wrinkles are likely to occur when the release material is peeled off, and to easily peel off the release material. Therefore, the first region is substantially square and the second region is rectangular.

  As described above in detail, according to the present invention, it is possible to provide an absorbent article that can be smoothly opened without being caught from an individual packaging state and that does not generate wing-like flaps or wrinkles when opened.

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 an enlarged plan view of the liquid-impervious back sheet 2 side of the wing-shaped flap W. 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 (VII-VII line arrow view of FIG. 6). It is a perspective view which shows the individual packaging procedure. It is a perspective view which shows the individual packaging procedure. It is a perspective view which shows the opening procedure. It is a top view which shows the other form of the wings prevention adhesive layer 16. FIG. It is an expanded view of the conventional sanitary napkin N. It is the cross-sectional view (XIII-XIII line arrow view of FIG. 12). FIG. It is a perspective view which shows the conventional opening state.

  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 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 fix to 23 and to be able to remove both peeling materials 18 and 19 by one 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 (see FIGS. 6 and 7).

  As the release materials 18 and 19, for example, a release treatment liquid such as a silicone resin, a fluorine resin, or an ethylene tetrafluoride resin is applied to the contact surfaces with respect to the slip prevention adhesive layers 16 and 17. Alternatively, paper, non-woven fabric, plastic sheet, or the like that has been spray-coated and mold-released 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.

  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.

  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 flap W》
In the sanitary napkin 1, the wing-shaped flap W is formed by a concavo-convex curve in which at least a part of the outline line is a wavy line, a curve, or a combination thereof, and the impermeable back surface of the wing-shaped flap W As shown in FIG. 2, a wings prevention adhesive layer 16 is formed on the sheet 2 side surface.

  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, a curve, or a combination of both the front outline 10 and the rear outline 11 in the illustrated example.

  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 wavy lines, curves, or a combination thereof, and some of them may be straight. 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 15 °, 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 35 to 40 °. In this case, the angle α formed by the width direction line of the sanitary napkin 1 and the front outer shape line 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 30 ° or more. When this angle difference is 30 ° 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 with the operation of moving the hand forward, it is tight. It will be able to be worn in a normal state.

  On the other hand, the protruding length L of the wing-shaped flap W is set to 35 mm or more, preferably 40 to 50 mm, so that the tips of the wings W overlap with each other at a crotch portion of the underwear 30. 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.

  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, the front ends of the wing-shaped flaps W, W folded on the liquid-permeable surface sheet 3 side are overlapped with each other, and the front-end back side (or surface) of the wing-shaped flap W is overlapped with the overlapping portion. The wing temporary fixing pressure-sensitive adhesive layer 21 provided on the side) is directly bonded and temporarily fixed as shown in FIGS.

<Wings prevention adhesive layer 16>
As shown in FIG. 5, each of the wings-stopping adhesive layers 16 formed on the surface of the wing-shaped flap W on the liquid-impermeable back sheet 2 side has a relatively long napkin width direction length and a napkin longitudinal direction. The first region 16A has a short length, and the second region 16B is located outside the first region 16A and has a relatively short napkin width direction length and a long napkin longitudinal direction length. Yes. The first region 16A and the second region 16B are provided adjacent to each other with a slight gap in the napkin width direction. The relative positional relationship between the first region 16A and the second region 16B is such that the front end of the first region 16A is shifted from the front end of the second region 16B to the rear side of the napkin. The rear ends of the respective regions are arranged so as to substantially coincide with each other. As a result, a region near the front base end portion of the wing-shaped flap W is a non-displacement prevention region 22 where the wings prevention adhesive layer 16 is not formed. The gap between the first region 16A and the second region 16B is about 0.5 to 2 mm, preferably about 0.5 to 1 mm. If the gap is too wide, the continuity between the first region 16A and the second region 16B is lost, and the fixing force to the underwear may be reduced. The rear end of the first region 16A and the rear end of the second region 16B do not necessarily coincide with each other, and the rear end of the first region 16A or the second region 16B is shifted to the rear side of the napkin. May be arranged.

  When the straight line L passing through the front end portion of the first region 16A and the front end portion of the second region 16B is drawn, the non-displacement prevention region 22 is an outline of the straight line L, the folding line RL, and the wing-shaped flap W. Is a substantially triangular area (shaded area shown in FIG. 5) located near the front proximal end of the wing-shaped flap W. The non-displacement stop region 22 is a region corresponding to the inversion region that is easily dragged or wrinkled on the wing-shaped flap W by being dragged by the release material at the time of opening, and the wings-stopping adhesive layer 16 is provided in the inversion region. By not forming the wings, the wings-stopping adhesive layers 16 are prevented from sticking to each other even if the wing-shaped flaps W are wrinkled or wrinkled when the release material is peeled off. Accordingly, the wing-shaped flap W can be smoothly opened without being caught at the folded portion.

  Here, the force which acts on the wing-shaped flap W at the time of opening is demonstrated. As shown in FIG. 5, the wing-shaped flap W folded by peeling off the wing release material 18 at the time of opening was folded back from the front end point P of the fold line RL of the wing release material 18. The force which pulls the wing-shaped flap W toward diagonally forward outward acts. This force becomes the tensile force T from the centroid G to the point P of the wings-stop adhesive layer 16 (the adhesive layer region obtained by adding the first region 16A and the second region 16B). When this tensile force T is decomposed into a component force Th in the napkin width direction and a component force Tv in the napkin longitudinal direction, the width direction force Th becomes a force for separating the wing-shaped flap W from the liquid-permeable surface sheet 3 and deploying it. On the other hand, the longitudinal component force Tv is a force that pulls the wing-shaped flap W forward of the napkin and causes wrinkles and twists at the base end. Therefore, by arranging the pressure-sensitive adhesive layer 16 so that the ratio of the component force Tv in the longitudinal direction is small, that is, the component force ratio Tv / Th is a small value, Can be prevented, and the wing-shaped flap W can be smoothly deployed.

  On the other hand, in the case of a general sanitary napkin, the wings-stopping adhesive layer is often composed of only the first region 16A disposed at the substantially central portion of the wing-shaped flap W. In this case, the centroid G 'of the wingsling prevention adhesive layer is the center of the first region 16A, and a tensile force T' from the centroid G 'toward the point P acts when opening. The component force ratio at this time is Tv ′ / Th ′ as described above.

  Here, when the component force ratio Tv / Th in the case of the wings-stopping adhesive layer 16 according to the present invention is compared with the component force ratio Tv ′ / Th ′ in the case of only the first region 16A, In the wings prevention adhesive layer 16 according to the invention, since the second region 16B is provided so as to extend in front of the first region 16A, the position of the centroid G is in front of the centroid G ′. Clearly located. Therefore, the longitudinal component force Tv becomes relatively small, and the component force ratio Tv / Th becomes a relatively small value. For this reason, the said wings prevention adhesive layer 16 becomes arrangement | positioning which can expand | deploy the wing-shaped flap W smoothly.

  As shown in FIG. 5, the wings-stopping adhesive layer 16 has a straight line L passing through the front end of the first region 16A and the front end of the second region 16B, and a fold line RL of the wing-shaped flap W. It is preferable that the first region 16A and the second region 16B are respectively arranged so as to intersect at approximately the center point 14. When the first region 16A and the second region 16B are each formed by a square or a rectangle, the front end of each region is a corner that connects the napkin front side and the napkin width center side. can do. As a result, the non-displacement prevention region 22 is formed almost to the center on the fold line RL of the wing-shaped flap W, so that even if the wing release material 18 is peeled to the vicinity of the center of the fold line RL, the wings prevention adhesive The layers 16 can be prevented from sticking to each other, and the individual packaging material can be smoothly peeled off without being caught. The position where the straight line L intersects the fold line RL is most preferably the center point 14 of the fold line RL, but it may be within a range of ± 10 mm, preferably within ± 5 mm, back and forth along the fold line RL.

  As shown in FIG. 5, the non-displacement prevention region 22 has a range in which an angle θ formed with the fold line RL is at least about 0 to 30 ° around the center point 14 of the fold line RL of the wing-shaped flap W. In addition, it is desirable to provide in a range of 90 ° or less, preferably 50 ° or less, and more preferably 45 ° or less. In particular, since wrinkles and twists are likely to occur in the range where θ is 50 ° or less, it is effective to set this range as the non-displacement prevention region 22.

The planar shapes of the first region 16A and the second region 16B are preferably such that the first region 16A is substantially square and the second region 16B is rectangular that is long in the napkin longitudinal direction. The first region 16A is substantially square when the length of each side is 1: 0.9 in addition to the genuine square in which the lengths of b ₁ and s ₁ are 1: 1 as shown in FIG. It is meant to include a quadrilateral that can be recognized as a substantially square in appearance in a range of ˜1: 1.1, preferably in a range of 1: 0.95 to 1: 1.05. As described above, the wing release material 18 is bonded to the individual packaging material at the fixing portion 20 at the center in the width direction, and the wing-shaped flap is used to peel the individual packaging material from the front end to the rear end of the sanitary napkin 1. After W and W are spread on both sides, when the wing release material 18 is peeled from the wings-stopping adhesive layer 16, it is gradually peeled off from the front side near the center in the width direction. At this time, the planar shapes of the first region 16A and the second region 16B are square and rectangular as described above, so that the wing release material 18 is gradually removed from the front corner near the center in the width direction of each region. Therefore, smoother peeling becomes possible.

Subsequently explained is the dimension of the first region 16A and the second region 16B, the length b ₁ of the napkins the width direction of the first region 16A, the length of the napkin width direction of the second region 16B b ₂ times or more, preferably 2 to 4 times. To ensure the non-displacement preventing region 22, the length _{b 1} is about 9～15Mm, the length _{b 2} is preferably about 4.5～7.5Mm. The length s ₁ of the first region 16A in the napkin longitudinal direction is ½ or less of the length s ₂ of the second region 16B in the napkin longitudinal direction, preferably about ½ to ¼. To prevent curling of the wing-shaped flaps W during mounting, the length _{s 1} is set to about 9～15Mm, the length _{s 2} is preferably about 18～30Mm. Furthermore, it is preferable that the area of the first region 16A is 1.2 times or more than the area of the second region 16B in order to prevent curling at the time of mounting.

  The first region 16A is preferably provided at a substantially central portion of the wing-shaped flap W in the longitudinal direction of the napkin. Further, the second region 16B has a portion in which the length of the wing-shaped flap W in the napkin width direction is the longest and all or a part of the wing-shaped flap W in the napkin width direction in order to prevent the wing-shaped flap W from being turned over. It is preferable to arrange in the overlapping region. Since the turn-up at the time of wearing tends to occur from the front end side of the wing-shaped flap W, the second region 16B can effectively prevent this.

<Individual packaging method and opening method>
As shown in FIG. 6, when the sanitary napkin 1 is individually folded (belly folded) together with the wing-shaped flaps W and W together with the wing release material 18 as shown in FIG. As shown, the width dimension is narrower than the developed width of the napkin 1 (distance between the tips of the wing-shaped flaps W, W), and has a predetermined length that is wider than the folded state of the wing-shaped flaps W, W. The sanitary napkin 1 is individually mounted with the dressing 23.

  As shown in FIG. 8, the sanitary napkin 1 is disposed on the individual packaging 23 so that at least one short side 23 a of the individual packaging 23 is positioned outside the front end of the napkin 1, and The material 23 and the main body release material 19 and / or the wing release material 18 (in the illustrated example, the individual material 23 and the wing release material 18 are fixed to each other at the fixing portion 20) are firmly fixed by a hot melt adhesive or the like. Stick. In the illustrated example, the rear end of the sanitary napkin 1 is located outside the other side short side 23 b of the individual packaging 23 in a state where the sanitary napkin 1 is disposed on the individual packaging 23.

  Then, as shown in FIG. 8, if the napkin rear end side is folded at the fold line (1) position, the napkin front end side is folded at the fold line (2) position, as shown in FIG. As described above, the open side edge portion 23c of the individual packaging material 23 is sealed by an appropriate sealing means such as embossing pressure bonding, heat fusion, adhesive, or the like alone or in combination. Further, the front-rear direction edge 23 a of the individual packaging material 23 is preferably sealed with a tab tape 24 after being joined with an adhesive.

  As shown in FIG. 10, when the individual packaging material 23 is peeled off, the wing-shaped flaps W and W are pulled to the back sheet side by the wing release material 18 and folded in the stomach as shown in FIG. The wing-shaped flaps W and W are automatically deployed. At this time, the adhesive strength of the wing temporary fixing pressure-sensitive adhesive layer 21 that joins the wing-shaped flaps W, W to each other is set to be the adhesive strength between the wings-stopping adhesive layers 16 and 16 and the wing release material 18. By setting it lower than this, temporary attachment between the wing-shaped flaps W, W can be easily released, which is preferable.

  As shown in this example, when the wing-shaped flaps W, W are unfolded, the wing-shaped flaps W, W are unfolded by folding the wing-shaped flaps W, W in the state of being used. Since some creases are attached to the side, the wing-shaped flaps W, W are not adhered to the main body displacement preventing adhesive layers 17, 17. Further, when the individual packaging material 23 is peeled off, the wing release material 18 and the main body release material 19 are peeled off, so that a complete one-step opening method can be realized.

[Other examples]
In the above embodiment, the first region 16A and the second region 16B are provided adjacent to each other with a gap in the napkin width direction, but as shown in FIG. 11, these regions 16A, 16B may be provided continuously.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impermeable back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 5 ... Crepe paper, 7 ... Side nonwoven fabric, 16 ... Wings prevention adhesive layer, 16A ... No. 1 region, 16B ... 2nd region, 17 ... main body slip-off adhesive layer, 18 ... wing release material, 19 ... main body release material, 20 ... fixing part, 21 ... wing temporary stop adhesive layer, 22 ... Non-displacement stop area, 23 ... Individual equipment

Claims (4)

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. ,
A main body anti-slip adhesive layer is formed on the liquid-impervious back sheet side surface of the main body part, and a wing anti-slip adhesive layer is formed on the liquid-impervious back sheet side surface of the wing-shaped flap. ,
In the individually packaged product state, the main body anti-slip adhesive layer and the wing anti-slip adhesive layer are integrally covered with a release material, and the wing-shaped flap is a fold line along the longitudinal direction of the absorbent article at the base end In the absorbent article folded together with the release material on the liquid-permeable surface sheet side,
The wings-resisting adhesive layer is positioned relatively on the outside of the first region, the first region having a relatively long width in the width direction and a short length in the longitudinal direction, and relatively absorbent. The first region and the second region are adjacent to each other with a gap therebetween or continuously provided with a second region having a short length in the width direction and a long length in the longitudinal direction. The wings-stop adhesive layer is formed in a region near the front base end portion of the wing-shaped flap by disposing the front end of the region in a position behind the absorbent article from the front end of the second region. Absorbent article, characterized in that it is a non-displaced area that is not to be displaced.   The absorbent article of Claim 1 provided so that the straight line which passes along the front-end part of a said 1st area | region and the front-end part of a 2nd area | region may cross | intersect at the substantially center part of the fold line of the said wing-shaped flap.   The non-displacement stop region is provided in a range where the angle formed with the fold line is at least 0 to 30 ° and is 90 ° or less, with the fold-shaped fold line of the wing-shaped flap as the center. The absorbent article according to claim 1 or 2.   The absorbent article according to any one of claims 1 to 3, wherein the first area is substantially square, and the second area is a rectangle that is long in the longitudinal direction of the absorbent article.

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