JP6668011B2 - Absorbent articles - Google Patents

Description

  TECHNICAL FIELD 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 underwear when fixing the same to the underwear.

  Conventionally, as an absorbent article N such as a sanitary napkin, a panty liner, a vaginal sheet, an incontinence pad, or the like, as shown in FIG. It is known that an absorbent 52 made of cotton-like pulp or the like is interposed between a nonwoven fabric or a liquid-permeable surface sheet 51 made of a porous plastic sheet or the like.

  As this kind of absorbent article N, for example, one or a plurality of adhesive layers 53 are formed on the non-skin contact surface side (outer surface) in order to prevent displacement in a mounted state, and the napkin body The wing-shaped flaps W, W extending outwardly are integrally formed on both sides in the longitudinal direction, and are adhered to the surface (outer surface) of the wing-shaped flaps W, W on the liquid-impermeable back sheet 50 side. There is one in which the agent layers 54, 54 are provided.

  In order to fix the absorbent article N to the undergarment 60, as shown in FIG. 11, the absorbent article N is applied to a locally corresponding portion of the undergarment 60, and the wing-shaped flaps W, W projecting sideways are attached to the undergarment. More outwardly, the two wing-shaped flaps W, W are folded back at the folding lines RL, RL, and while the crotch portion of the underwear is wound around, the adhesive is attached to the outer surface of the crotch portion of the underwear 60, and then the underwear is worn on the body. I have to.

  However, when the wing-shaped flap is folded back, careless folding causes only a part of the wing-shaped flap to be folded back, and the adhesives to adhere to each other to form wrinkles or bulges, or the wing-shaped flaps to be folded back in the middle, resulting in an adhesive. In some cases, erroneous bonding was caused. In addition, the wing-shaped flap cannot be folded exactly at the folded line RL, and the folded line of the wing-shaped flap is bent obliquely and folded. And other problems.

  Therefore, various means have been proposed for improving the fixability of the wing-shaped flap to underwear (hereinafter, also referred to as shorts). For example, in Patent Literature 1 below, an absorbent body having an absorbent layer and a leak-proof layer, and provided on both sides of the absorbent body in the excretion part-facing portion, are bent toward the non-skin-facing surface side of the undergarment to form the undergarment. In the absorbent article having a pair of fixed wings, the shape of each of the pair of wings is asymmetrical before and after a widthwise transverse line passing through the midpoint of the edge of the tip of each wing, Each of the wings has an inclination angle of the rear edge of the absorbent article in the longitudinal direction with respect to the longitudinal direction of the absorbent main body, and an inclination angle of the front edge of the absorbent article in the longitudinal direction with respect to the longitudinal direction of the absorbent main body. Smaller, the front edge in the longitudinal direction of the absorbent article of each of the pair of wing portions is formed in a straight line, and the rear edge in the longitudinal direction of the absorbent article in each of the pair of wing portions is formed in a continuous wave shape. ing Osamusei article is disclosed.

  Further, in Patent Document 2 described below, the crotch portion of the underwear is fixed to the both sides of the main body portion where the absorber is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet so that the crotch portion of the underwear is wound around at the time of mounting. In the absorbent article formed with the wing-shaped flap to be formed, the wing-shaped flap has a front outline extending outward from the main body part and a rear outline extending outward from the main part, The angle formed between the width direction line of the absorbent article and the rear side outline is set to be larger than the angle formed by the width direction line of the absorbent article and the front side outline, and the center of gravity of the wing-shaped flap is winged. An absorbent article is disclosed that is biased forward of the center of the joint line between the base of the flap and the body portion. Patent Document 2 also discloses that the front outline and the rear outline are wavy lines, curves, or a combination thereof.

  Further, in Patent Document 3 described below, the crotch portion of the underwear is fixed to the both sides of the main body portion where the absorber is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet so that the crotch portion of the underwear is wrapped around at the time of mounting. In the absorbent article formed with the wing-shaped flap to be formed, the wing-shaped flap has a front outline extending outward from the main body part and a rear outline extending outward from the main part, The outer shape line is a wavy line formed by repeating a convex portion protruding outward and a concave portion protruding inward, and the apex of the outermost concave portion and the rear outer shape line of the wing-shaped flap are an absorbent article. There is disclosed an absorbent article in which a straight line connecting a connection point connected to a main body portion of the absorbent article is set at an angle of 60 to 65 ° with respect to a width direction line of the absorbent article passing through the connection point.

Japanese Patent No. 4641979 JP 2009-125430A JP 2013-75010 A

  The absorbent articles described in Patent Literatures 1 and 2 are designed so that the wing-shaped flap can be folded exactly along the crotch side edge of the shorts, and are significantly different from conventional trapezoidal wing-shaped flaps. When putting the hand on the wing-shaped flap and folding the flap, the finger hits the front outline of the wing-shaped flap, but the front outline is straight like the napkin according to Patent Document 1. In this case, the flap could fail to be folded because the finger was not caught. In addition, Patent Document 2 discloses that the front outer shape line is a wavy line, a curve, or a combination thereof. However, if the finger is not positioned at an appropriate position on the wing-like flap, the flap may still be distorted. In some cases, the folding failed and the side edges of the shorts could not be folded properly.

  On the other hand, in the absorbent article according to Patent Document 3, the outermost concave portion is set as a position where the index finger of the hand is hooked, and when the user folds the wing-shaped flap, the index finger is set. Is hooked on the concave portion, so that the wing-shaped flap can be folded easily along the side edge of the shorts at the regular folding position (root position) by improving the foldability of the wing-shaped flap. It is said to have the effect of.

  However, according to the investigation and study of the inventor, two fingers of the middle finger and the ring finger or three fingers from the middle finger to the little finger are not in contact with the rear outline of the wing-shaped flap with an equal contact pressure. In addition, it was found that the force applied to the rear outline became uneven, and the wing-shaped flaps were distorted, so that they could not be folded exactly.

  Accordingly, a main object of the present invention is to provide an absorbent article in which a wing-shaped flap can be folded exactly at a regular folding position (root position) along the side edge of the shorts.

In order to solve the above-mentioned problem, as the present invention according to claim 1, the crotch portion of the underwear is wrapped around both sides of the main body portion where the absorber is interposed between the liquid-permeable top sheet and the back sheet at the time of mounting. In the absorbent article on which the wing-shaped flap is fixed as described above,
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,
The front outline is a wavy line formed by repeating a convex portion protruding outward and a concave portion protruding inward, and a vertex P of the concave portion located at the outermost position and a rear outline of the wing-shaped flap are formed as follows. The straight line connecting the connection point Q connected to the main body portion of the absorbent article is set at an angle α of 60 to 80 ° with respect to the width direction line of the absorbent article passing through the connection point,
And a straight line obtained by drawing a longitudinal line of the absorbent article passing through the vertex A of the convex portion located at the outermost side of the front outline to the intersection B with the rear outline, and the longitudinal line The intersection angle β between the intersection B intersecting with the side outline and the straight line connecting the rear outline of the wing-shaped flap to the connection point Q connected to the main body of the absorbent article is set to an angle of 132 to 155 °. Thea is,
The protruding length D of the wing-shaped flap in the width direction of the absorbent article is 40 mm or more and 60 mm or less, and the vertex A of the outermost convex portion of the front outer shape line and the apex of the absorbent article passing through the vertex A distance L ₁ between the intersection B of the longitudinal line intersects the rear outline is 30mm or 40mm or less, the length L ₂ of the rear outline is 55mm or 85mm or less, the width direction line of the absorbent article wherein The angle θ formed with the front outline is −10 to 20 °,
The radius of curvature r of the outermost concave portion is not less than 10 mm and not more than 20 mm, and the rear outer shape line excludes a rubbing curve portion formed at an end for connection to an adjacent outer shape line. An absorbent article is provided, wherein the intermediate portion is a circular arc line bulging outward with a radius of curvature R of 150 to 300 mm .

  According to the first aspect of the present invention, the front outer shape line of the wing-shaped flap is a wavy line formed by repeating a convex portion protruding outward and a concave portion protruding inward, and a vertex of the concave portion located most outwardly. A straight line connecting the rear side outline of the wing-shaped flap to a connection point connected to the main body portion of the absorbent article forms an angle of 60 to 80 ° with respect to the width direction line of the absorbent article passing through the connection point. It has been set.

  The outermost concave portion is set as a position where the index finger of the hand is hooked. In the invention according to Patent Document 3, it is described that the angle range is desirably set to 60 to 65 °. However, two fingers of the middle finger and the ring finger or three fingers from the middle finger to the little finger are described. Assuming that the wing-shaped flaps come into uniform contact with the rear outline, it has been found that the longitudinal dimension of the rear outline becomes longer. Therefore, in the present invention, the angle range is in the range of 60 to 80 °. Is set to

  When the present inventor investigated the direction and position of the hand when the user folded the wing-shaped flap, two fingers of the middle finger and the ring finger, or three fingers from the middle finger to the little finger, showed the rear outline of the wing-shaped flap. When it is assumed that the contact points are evenly contacted, the vertex of the outermost concave portion is connected to the connection point where the rear outline of the wing-shaped flap connects to the main body of the absorbent article. In view of the fact that the index finger is most often positioned in the direction of a straight line angle of 60 to 80 °, the position of the concave portion is set as described above, and when the user folds the wing-shaped flap, the index finger is The wing-shaped flap is easily folded back by hooking on the concave part, and the wing-shaped flap is properly folded along the side edge of the shorts at the regular folded position (root position). It is as Dekiru to.

  On the other hand, in the present invention, with respect to the rear outline of the wing-shaped flap, the longitudinal direction line of the absorbent article passing through the apex of the convex portion located at the outermost side of the front outline is up to the intersection with the rear outline. The angle of intersection between the drawn straight line and the straight line connecting the intersection where the longitudinal direction line intersects with the rear outline and the connection point where the rear outline of the wing-shaped flap connects to the main body of the absorbent article. The angle is set to 132 to 155 °. The rear outline is a portion where two fingers of the middle finger and the ring finger or three fingers from the middle finger to the little finger are in contact, and the force from each finger with respect to the rear outline is applied to the rear outline. When the most appropriate inclination angle of the rear outline was investigated in order to make it act evenly on the line, when the intersection angle was 132 to 155 °, each finger exerted an equal force on the rear outline. In view of the fact that there were many contacts, the angle of the intersection was set as described above, and when the user folded the wing-shaped flap, the index finger was hooked on the concave portion, On the other hand, when two fingers of the middle finger and the third finger or three fingers from the middle finger to the little finger are attached, these fingers come into contact with the rear outline with an equal contact pressure, so that the wing-shaped flap Wing flaps on the shorts side without causing distortion It becomes possible to tightly folded back in a normal folded position (base position) along.

  In the present invention, “outward” refers to a direction away from the side edge of the absorbent article. The terms “inside” and “outside” mean that the side of the absorbent article with respect to an arbitrary reference line is called “inside” and the opposite side is called “outside”.

In the present invention, the shape and dimension of the wing-shaped flap are such that the protruding length D of the wing-shaped flap in the width direction of the absorbent article is 40 mm or more and 60 mm or less, and the apex of the outermost convex portion of the front outer shape line. a and, the apex longitudinal wire of the absorbent article through the a following 40mm distance L ₁ is 30mm or more between the intersection B which intersects the rear outline, the length L ₂ of the rear side outer line or 55mm 85 mm or less, and the angle θ between the width direction line of the absorbent article and the front outer line is −10 to 20 °. The protruding length D is set to 40 mm or more and 60 mm or less so that the rear outline of the wing-shaped flap can be easily folded by pressing the two fingers of the middle finger and the ring finger or the three fingers from the middle finger to the little finger. When the wing-shaped flap is folded back, two fingers of the middle finger and the ring finger or three fingers from the middle finger to the little finger can be easily attached to the rear outline with the forefinger hooked on the concave portion. to the vertex a of the convex portion positioned on the most outside of the front outline, the distance L ₁ between the intersection of the longitudinal line of the absorbent article through the vertex a intersects the rear outline is 30mm those above 40mm or less, the length of the rear outline L ₂ of 55mm or more 85mm or less, an angle formed by the width direction line of the absorbent article and the front outline θ is set to the range of -10 to 20 ° is there.

Furthermore, in the present invention, to facilitate hand index finger is applied to the concave portion, and the radius of curvature r of the concave portion and 10mm or 20mm or less, the rear contour line to an end portion for connection to an adjacent outline The intermediate portion excluding the formed rubbing curve portion is an arc-shaped line bulging outward with a radius of curvature R of 150 to 300 mm.

  Considering a state in which the hand is naturally opened, the three fingers from the middle finger to the little finger are not arranged on the same plane, but are arranged on an arc-shaped line having a predetermined radius of curvature. Therefore, when two fingers of the middle finger and the ring finger or three fingers from the middle finger to the little finger are attached to the rear outline, these fingers come into contact with the rear outline with a more uniform contact pressure. In order to achieve this, it is desirable that the shape of the rear outer line be an arcuate line bulging outward with a radius of curvature of 150 to 300 mm.

As the present invention according to claim 2 , the angle formed by the width direction line of the absorbent article and the rear outline is larger than the angle formed by the width direction line of the absorbent article and the front outline. It is set, the absorbent article according to claim 1 Symbol placement is offset to the front side than the center of the bonding line between the root and the body portion of the center of gravity of the wing-shaped flaps wing-shaped flaps are provided.

According to the second aspect of the present invention, the plane shape of the wing-shaped flap is positioned between the widthwise line of the absorbent article and the rearward angle of the line between the widthwise line of the absorbent article and the front outline (θ: see FIG. 4). The angle (γ (= β-90 °): 〃) formed with the side outline is set larger, and the center of gravity of the wing-shaped flap is located forward of the center of the joining line between the base of the wing-shaped flap and the main body. (ΔT: 〃). In other words, instead of the flap shape of the conventional isosceles trapezoidal shape, a substantially triangular or unequal leg trapezoidal shape in which the inclination of the rear side of the flap is steeper than that of the front side is adopted. By adopting such an outer shape, as will be described in detail later, it is easy to fold exactly at the normal folding position. Note that the straight line for determining the angle θ formed by the front outer shape line is a direction line that comes into contact with the outermost convex portion of the wavy line. In addition, a straight line for determining the angle γ formed by the rear outer shape line is drawn as a longitudinal line of the absorbent article passing through the vertex of the concave portion located at the outermost side of the front outer shape line, and this longitudinal line is A straight line connecting an intersection point intersecting with the rear outline and a connection point at which the rear outline of the wing-shaped flap connects to the main body of the absorbent article.

  By adopting the outer shape as described above, the wing-shaped flap can be easily folded back to the proper fold position without causing problems such as adhesion of adhesives or erroneous adhesion, as described in detail later. You will be able to stick it.

The present invention according to claim 3 , wherein the wing-shaped flap has a wingslip-preventing pressure-sensitive adhesive layer on the surface of the back sheet, and the wing-shaped flap is a liquid-permeable topsheet-side surface and the wing-slip-preventive pressure-sensitive adhesive. The absorbent article according to any one of claims 1 and 2, wherein a mark for a deviation preventing position is formed at a position corresponding to a portion where the agent layer is provided.

In the invention according to claim 3 , in the case of the present invention, the area of the wing-shaped flap is larger than that of the conventional one, so that the position of the wingslip-preventing pressure-sensitive adhesive layer is difficult to understand. It is intended to provide a mark for a deviation preventing position.

  As described in detail above, the wing-shaped flap can be folded properly at the regular folding position (root position) along the side edge of the shorts.

FIG. 2 is a partially exploded development view of the sanitary napkin 1 according to the present invention. FIG. FIG. 3 is a view taken along line III-III in FIG. 1. It is a principal part enlarged plan view (the 1) of a wing-shaped flap. It is a principal part enlarged plan view (the 2) which shows the other example of a wing-shaped flap. (A) shows the case of the conventional wing-shaped flap, and (B) shows the case of the wing-shaped flap according to the present invention. (A) shows the case of the conventional wing-shaped flap, and (B) shows the case of the wing-shaped flap according to the present invention. It is a schematic diagram (A)-(B) which shows other planar shapes of the wing-shaped flap which concerns on this invention. It is a wing-shaped flap enlarged plan view which shows the other example of the wing-shaped flap which concerns on this invention. It is a development view of the conventional sanitary napkin N. FIG.

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

<< 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, or the like, a liquid-permeable top sheet 3 that allows menstrual blood, vaginal discharge, etc. to pass through quickly. , 3 made of cotton-like pulp or synthetic pulp, crepe paper 5 surrounding the absorber 4 for maintaining the shape of the absorber 4 and improving diffusibility, A second sheet 6 made of a hydrophilic nonwoven fabric interposed between the hydrophilic surface sheet 3 and the crepe paper 5, and side nonwoven fabrics 7, 7 formed on both sides of the surface along the longitudinal direction, respectively. At the upper and lower edges of the periphery of the absorber 4, the outer edges of the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat sealing. The liquid-impervious back sheet 2 extending laterally beyond the absorber 4 and the side nonwoven fabric 7 at both side edges thereof are joined by an adhesive such as hot melt or an adhesive means such as heat sealing. Have been.

Hereinafter, the structure of the sanitary napkin 1 will be described in more detail.
The liquid-impermeable backing sheet 2 is made of a sheet material having at least water-blocking properties, such as an olefin-based resin sheet such as polyethylene or polypropylene. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, A non-woven fabric sheet (in this case, a liquid-impermeable back sheet is constituted by the waterproof film and the non-woven fabric) can be used after substantially impermeable to liquid has been ensured through a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water-permeable and moisture-permeable sheet material is a microporous sheet obtained by melt-kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching it uniaxially or biaxially. It is.

  As the liquid permeable surface sheet 3, a perforated or non-porous nonwoven fabric or a porous plastic sheet is suitably used. The material fibers constituting the nonwoven fabric may be, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., 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, and a needle punch method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapability, and the thermal bond method is excellent in that it is bulky and soft. It is desirable to apply various embosses from the upper surface side of the liquid-permeable topsheet 3 to promote stagnation of bodily fluids and increase absorption efficiency to prevent lateral leakage. The fibers of the nonwoven fabric may be either long fibers or short fibers, but preferably short fibers are used to give the texture of the toweling. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin-based fiber such as polyethylene or polypropylene having a relatively low melting point. Further, composite fibers such as a core-sheath fiber, a side-by-side fiber, a split fiber, and the like, in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, can also be suitably used.

  The absorber 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluff-like pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as a 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.Conifer 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 absorber 4 is provided as in this example, the crepe paper 5 is interposed between the liquid-permeable top sheet 3 and the absorber 4 as a result. The crepe paper 5 which is excellent in swiftness allows the body fluid to be quickly diffused and prevents the menstrual blood from returning.

  The second sheet 6 made of a hydrophilic nonwoven fabric interposed between the liquid permeable surface sheet 3 and the crepe paper 5 is made of, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters and polyamides, and rayon. And non-woven fabric obtained by appropriate processing methods such as spunlace method, spun bond method, thermal bond method, melt blown method, and needle punch method. Can be. Further, composite fibers such as a core-sheath fiber, a side-by-side fiber, a split fiber, and the like, in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, can also be suitably used. To impart hydrophilicity, a compound having a hydrophilic group in the process of producing synthetic fibers, for example, a method of polymerizing in the presence of an oxidation product of polyethylene glycol or the like, or treating with a metal salt such as stannic chloride, The synthetic fiber can be made to be swollen or porous by a method of partially dissolving the surface to make it porous and depositing a metal hydroxide, etc., and impart hydrophilicity by applying capillary action. The second sheet 6 is most preferably used in combination with the liquid-permeable surface sheet 3 as a porous plastic sheet.

  On the other hand, side non-woven fabrics 7, 7 are provided along the longitudinal direction and over substantially the entire length of the napkin 1, respectively, on both surface side portions of the sanitary napkin 1, and a part of the side non-woven fabric 7, 7 is provided on the side. The wing-shaped flaps W, W are formed by a part of the liquid-impervious back sheet 2 which also extends to the side and also extends to the side. The wing-shaped flap W will be described later in detail.

  As the side non-woven fabric 7, a water-repellent non-woven fabric or a hydrophilic non-woven fabric can be used from the viewpoint of functions that are regarded as important. For example, if the emphasis is on functions such as preventing menstrual blood or vaginal discharge from permeating, or enhancing the feel of the skin, water-repellent treatment coated with a silicon-based, paraffin-based, alkylchromic chloride-based water repellent, etc. It is desirable to use a non-woven fabric. Further, if emphasis is placed on the absorbability of menstrual blood and the like in the wing-shaped flaps W and W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol in the production process of the synthetic fiber, may be used. Swelling or porosity of the synthetic fiber by treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxide, and applying the capillary phenomenon to make it hydrophilic. Is used.

  As shown in FIG. 2, the non-skin contact surface of the main body portion in which the absorber 4 is interposed between the liquid-permeable top sheet 3 and the liquid-impermeable back sheet 2 is provided for fixing to underwear. Are formed with an appropriate application pattern, and in the illustrated example, three main body slip-preventing pressure-sensitive adhesive layers 8, 8... Are formed, and the main body slip-resistant adhesive layers 8, 8. Covered by wood. A wingslip-preventing pressure-sensitive adhesive layer 9 is formed on the surface of the wing-shaped flaps W, W on the liquid-impermeable backing sheet 2 side, and the wingslip-preventing pressure-sensitive adhesive layers 9, 9 are not shown. Covered with a release material. It is preferable that the release material is configured such that the release material for the main body and the release material for the wing arranged in the transverse direction are joined at an intersection, so that the release material can be removed with one peeling operation. W and W may be folded on the liquid-permeable top sheet 3 side in the individually mounted state, so-called belly-fold, or may be folded on the liquid-impermeable back sheet 2 side, so-called back-fold. Further, the release material for covering the wingslip-preventing pressure-sensitive adhesive layers 9, 9 may be separated into right and left instead of one release material.

  As the release material, a release treatment liquid such as a silicone-based resin, a fluorine-based resin, or a tetrafluoroethylene-based resin is applied to the contact surfaces with the slip-resistant pressure-sensitive adhesive layers 8 and 9 or sprayed. Release-treated paper or a plastic sheet can be used.

  As the pressure-sensitive adhesive for forming the shift-preventive pressure-sensitive adhesive layers 8 and 9, for example, a pressure-sensitive adhesive mainly containing any one of a styrene-based polymer, a tackifier, and a plasticizer is preferably used. Examples of the styrene-based polymer include a styrene-ethylene-butylene-styrene block copolymer, a styrene-butylene-styrene block copolymer, a styrene-isobutylene-styrene copolymer, a styrene-butadiene-styrene block copolymer, 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 that it has good thermal stability. As the tackifier and plasticizer, those which are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resin, C9 petroleum resin, dicyclopentadiene petroleum resin, and rosin petroleum resin. , Polyterpene resins, terpene phenolic resins, and the like. Examples of the plasticizer include monomer plasticizers such as triflesyl phosphate, dibutyl phthalate, and dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. Can be

《Wing-shaped flap W》
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 body portion, and the front outline 10. And a front-side outer line 12 connecting the rear-side outer line 11. The boundary points between the front outer line 10, the rear outer line 11, and the front outer line 12 are sewn when a sloping curve connecting adjacent outer lines is introduced as in the illustrated example. The midpoint of the curve.

The front outer shape line 10 is a wavy line formed by repeating a convex portion protruding outward and a concave portion protruding inward. Specifically, before Symbol connection point front outline 10 is connected to the body portion of the napkin 1 of the wing-shaped flaps W S (hereinafter, also referred to as a front origin.) In order outwardly from the site, the first concave portion 10a, The first convex portion 10b, the second concave portion 10c, and the second convex portion 10d constitute the wavy front outer shape line 10. The second concave portion 10c is the "outmost concave portion" in the present invention. Then, a vertex P of the outermost concave portion 10c and a connection point Q (hereinafter, also referred to as a rear starting point) at which the rear outline of the wing-shaped flap connects to the main body of the absorbent article. Are set at an angle α of 60 to 80 °, preferably 65 to 75 ° with respect to the width direction line of the napkin 1 passing through the rear starting point Q. The radius of curvature r of the outermost concave portion 10c is desirably 10 mm or more and 20 mm or less, and the other first concave portion 10a, first convex portion 10b, and second convex portion 10d are also preferable. The radius of curvature is preferably set to 10 mm or more and 20 mm or less from the balance of the wavy line.

  The outermost concave portion 10c is set as a position where the index finger of the hand is hooked when a palm is attached to fold the wing-shaped flap W. That is, the angle α of the straight line H connecting the vertex P of the concave portion 10c located at the outermost position and the rear starting point Q of the wing-shaped flap W is defined with respect to the width direction line of the napkin 1 passing through the rear starting point Q. When the angle is set in the range of 60 to 80 °, preferably 65 to 75 °, when the user turns back the wing-shaped flap W, the index finger is positioned exactly in the concave portion 10c and is caught so as not to be shifted sideways. The regular flap W (root position) along the side edge of the shorts can be easily and precisely folded.

On the other hand, as shown in FIG. 4, the rear outline 11 is a longitudinal line of the napkin 1 that passes through the vertex A of the convex portion 10 d located on the outermost side of the wavy line in the front outline 10. a straight line H ₁ drawn to the intersection point B between the rear outline 11, the side outline 11 after the longitudinal line and the intersection B which intersects the rear outline 11 the wing-shaped flaps W is of the napkin 1 crossing angle β is one hundred thirty-two to one hundred fifty-five ° with the straight line _{H 2} for connecting the connection point Q to be connected to the body portion, Aru preferably set to an angle of 135 to 145 °. The intersection angle β is an angle on the side having the center of gravity 13 of the wing-shaped flap W in a region sandwiched between the _two straight lines (H ₁ , H ₂ ).

  When the intersection angle β is set to an angle of 132 to 155 °, preferably 135 to 145 °, in order to fold the wing-shaped flap W, when the index finger is attached to the concave portion 10c with a palm attached, Two fingers of the middle finger m and the ring finger n or three fingers from the middle finger m to the little finger k come into contact with the rear outline 11 evenly, and the wing-shaped flap W is not distorted, and The regular flap (root position) can be folded exactly along the side edge of the shorts.

  In the example of FIG. 4, the rear outer line 11 is an intermediate portion excluding a rubbing curve portion formed at an end portion for connection to an adjacent outer line (a front outer line 12 and a napkin body outer line). Although the portion is a straight line, as shown in FIG. 5, the rear outline 11 has an intermediate portion excluding a rubbing curve portion formed at an end for connection to an adjacent outline. It is also possible to use an arcuate line bulging outward with a radius of curvature R of 150 to 300 mm, preferably 200 to 250 mm. When the hand is opened in a natural state, the three fingers from the middle finger m to the little finger k do not line up on the same plane, but line up on an arc-shaped line having a predetermined radius of curvature. The curvature radius R is set as a curve passing through three fingers from the middle finger m to the little finger k with the hand opened in a natural manner. Therefore, when two fingers of the middle finger m and the ring finger n or three fingers from the middle finger m to the little finger k are attached to the rear outline 11, these fingers move with respect to the rear outline 11. Since the contact is made with a more uniform contact pressure than in the case of a straight line, the wing flap W can be turned back without causing distortion.

  The shape of the wing-shaped flap W is a width-directional line passing through the rear-side starting point Q of the wing-shaped flap W more than an angle θ formed between the width-direction line passing through the front-side starting point S of the wing-shaped flap and the front outer contour line 10. The angle γ (= β−90 °) between the wing-shaped flap W and the rear outer line 11 is set to be larger, and the center of gravity 13 of the wing-shaped flap W is The center point 14 is shifted to the front side by ΔT. In addition, when the shape satisfying the above condition is schematically shown, the shape becomes a substantially triangular shape as shown in FIG. 7B or a substantially unequal leg trapezoidal shape as shown in FIG. When the shape is a substantially triangular shape, there is no front end outer line 12 connecting the front outer line 10 and the rear outer line 11.

In addition, the straight line of the front outer shape line 10 when obtaining the angle θ is a direction line that contacts the vertex A of the convex portion 10d located at the outermost side of the wavy line, and the straight line when obtaining the angle γ is A direction line (H ₂ ) connecting the intersection B and the rear starting point Q is set.

  As shown in FIG. 8A, the angle θ between the width direction line passing through the front starting point S of the wing-shaped flap and the front outer shape line 10 is set to a minus range, and As shown in FIG. 8 (B), the angle θ may be 0, and the front outline 10 may be a horizontal line. Is also good. When the angle θ formed with the front outer shape line 10 is in the range of 0 to minus, the center of gravity can be shifted to the front side, and the wing-shaped flap W can be put on the wing-shaped flap W in a wide range. W can be folded easily.

  The angle θ between the width direction line of the sanitary napkin 1 and the front outer line 10 is about −10 to 20 °, and the angle formed between the width direction line of the sanitary napkin 1 and the rear outer line 11. γ is desirably 42 to 65 °, preferably about 45 to 55 °. In this case, an angle difference between an angle θ formed between the width direction line of the sanitary napkin 1 and the front outer shape line 10 and an angle γ formed between the width direction line of the sanitary napkin 1 and the rear shape line 11. Is desirably 30 ° or more. When this angle difference is 30 ° or more, a sufficient eccentric distance ΔT can be secured, and when the wing-shaped flap W is folded back, the wing-shaped flap is folded by hand with the operation of moving the hand forward as described later. Even so, it will be able to be mounted in a regular state exactly.

  By forming the wing-shaped flap W into the outer shape as described above, the wing-shaped flap can be easily folded and adhered at the regular folding position without causing a problem such as adhesion between the adhesives and erroneous adhesion. It is possible to bring advantages such as. This point will be described in more detail by comparison with a conventional isosceles trapezoidal wing-shaped flap W (see FIG. 10).

  First, when a woman wears the sanitary napkin 1 on the shorts 20 while sitting on the toilet or the like, the sanitary napkin 1 is lowered and lowered, as shown in FIG. Work will be performed.

  In the case of the conventional wing-shaped flap W having a trapezoidal trapezoid shape, as shown in FIG. 6A, a structure in which the wing-shaped flap cannot be mounted properly unless the hands are attached to both sides of the napkin is folded directly downward. It has become. However, since the mounting position is located on the front side of the body, an operation of moving the hand to the front side (Fig. 5 (B)) may occur unless care is taken, and only a part of the wing-shaped flap is folded back. Adhesives have adhered to each other to form wrinkles or raised portions, and wing-like flaps W have been folded back in the middle, causing problems such as erroneous adhesion to adhere to the adhesive layer. In addition, the folding line of the wing-like flap may be bent obliquely and folded. On the other hand, when the wing-shaped flap W has a wing shape in which the center of gravity 13 of the wing-shaped flap W is deviated to the front side as in the present invention, when the wing-shaped flap W is folded back as shown in FIG. If the palm is folded forward in the posture, the wing-shaped flap W can be naturally and precisely mounted in a regular state.

  FIG. 7 (A) shows an action force mechanism at the time of folding the conventional wing-shaped flap W having the shape of a trapezoidal trap. In the case where the wing-shaped flap is folded by hand while moving the hand forward. Assuming that a load acting downward from the rear outer line of the wing-shaped flap W to the tip side acts thereon, and assuming a concentrated load を P that summarizes these distributed loads, the base point of the moment generated by the concentrated load ΣP is It becomes the center point 14 of the joining line 15 of the wing-shaped flap, and twisting occurs when the wing-shaped flap W is folded, and the folded line 16 that gradually advances from the base end of the rear outer shape line 11 is inclined outward. Will be.

  On the other hand, in the case of the present invention, as shown in FIG. 7 (B), it is assumed that a downward load acts on the central portion of the inclined rear outer line 11, and these distributed loads are summarized. Assuming a concentrated load ΔP, the base point of the moment generated by the concentrated load ΔP is a center-of-gravity division point 13 ′ (a 1: 2 division point of the joint line 15) shifted forward from the center point 14 of the joint line 15 of the wing-shaped flap. Since there is little torsion when the wing-shaped flap W is folded, the folding line 16 that gradually advances from the base end of the rear outer shape line 11 matches the joining line 15 and is folded at the regular folding position. Become.

  In addition, since the rear outer shape line 11 of the wing-shaped flap W has a greatly inclined shape, the folded line RL can be formed tightly without causing a problem such as adhesion between the adhesives and erroneous adhesion of the wing-shaped flap W. And will be folded.

  Hereinafter, the preferred shape and dimensions of the wing-shaped flap W will be described in detail.

4 and 5, the protruding length (D) of the wing-shaped flap in the width direction of the absorbent article is such that the rear outline 11 of the wing-shaped flap W extends from the middle finger and the third finger or the middle finger to the little finger. The thickness is preferably 40 mm or more and 60 mm or less, and more preferably 45 mm or more and 55 mm or less so that it can be easily folded by pressing with three fingers. Also, when the user turns the wing-shaped flap back, the two fingers of the middle finger m and the ring finger n or the middle finger m to the little finger k with respect to the rear outline 11 in a state where the index finger is hooked on the concave portion 10c. as easily served with three fingers up, most the vertex a of the convex portion 10d which is positioned outward, longitudinal line H ₁ is the rear of the napkin 1 through this vertex a of the front outline 11 The distance (L ₁ ) from the intersection B intersecting with the outline 11 is preferably 30 mm or more and 40 mm or less, and more preferably 33 mm or more and 37 mm or less.

The length (L ₂ ) of the rear outer line 11 is determined by dividing the rear outer line 11 of the wing-shaped flap W by two fingers of the middle finger m and the ring finger n or three fingers from the middle finger m to the little finger k. The thickness is preferably 55 mm or more and 85 mm or less, more preferably 60 mm or more and 75 mm or less in order to make the pressing easier.

Further, the distance (L ₀ ) between the front starting point S of the wing-shaped flap and the rear starting point Q of the wing-shaped flap, that is, the base end width of the wing-shaped flap is 80 mm or more and 100 mm so as to fit into the curved portion of the crotch of the shorts. The distance is preferably set to 85 mm or more and 95 mm or less.

[Other embodiments]
(1) In the case of the present invention, since the area of the wing-shaped flap W tends to be larger than that of the conventional one, it becomes difficult for the user to recognize the position of the wingslip-preventing pressure-sensitive adhesive layer 9. Therefore, as shown in FIG. 9, a mark for a slip preventing position is provided on the surface of the wing-shaped flap W on the liquid-permeable top sheet 3 side, which corresponds to the portion where the wing slip preventing adhesive layer 9 is provided. 17 is preferably provided. It is only necessary that the offset position mark 17 partially overlaps the wing offset adhesive layer 9. Further, it can be formed by embossing and embossing, and the design can be an arbitrary design such as a floral pattern as shown in the illustrated example, a heart shape, a crescent shape and a star shape. In order to prevent the misalignment mark 17 from being hardened by embossing, the mark 17 is preferably formed to have an area of 以下 or less, preferably １ ／ or less of the total area of the wing-shaped flap W.

(2) Since the wing-shaped flap W is made of a material having elasticity in the longitudinal direction and / or the width direction of the napkin, the wing-shaped flap W follows the movement of the body and relieves stress. Is good, and it is difficult to shift. Specifically, as the side nonwoven fabric 7, a side nonwoven fabric having elasticity, specifically, a nonwoven fabric formed of long fibers made of an elastic resin material which is easily reversibly plastically deformed such as polyurethane, or stretched At this time, the fiber diameter of the fiber itself does not change, but a zigzag or spiral crimp is formed, and a nonwoven fabric or the like that is made to exhibit elasticity by stretching the crimp is used. By using an elastic plastic film as the liquid back sheet 2, the wing-shaped flaps W, W are given elasticity so as to follow the movement of the body.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorbent, 5 ... Crepe paper, 6 ... Second sheet, 7 ... Side nonwoven fabric, 8 ... Body slip preventing adhesive Layer 9: Wing-slip-preventive pressure-sensitive adhesive layer, 10: Front outline, 11: Rear outline, 12: Front outline, W: Wing-shaped flap

Claims (3)

Absorbent article having wing-shaped flaps formed on both sides of a main body portion in which an absorber is interposed between a liquid-permeable top sheet and a back sheet, so that the crotch portion of the underwear is fixed at the time of mounting, respectively. At
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,
The front outline is a wavy line formed by repeating a convex portion protruding outward and a concave portion protruding inward, and a vertex P of the concave portion located at the outermost position and a rear outline of the wing-shaped flap are formed as follows. The straight line connecting the connection point Q connected to the main body portion of the absorbent article is set at an angle α of 60 to 80 ° with respect to the width direction line of the absorbent article passing through the connection point,
And a straight line obtained by drawing a longitudinal line of the absorbent article passing through the vertex A of the convex portion located at the outermost side of the front outline to the intersection B with the rear outline, and the longitudinal line The intersection angle β between the intersection B intersecting with the side outline and the straight line connecting the rear outline of the wing-shaped flap to the connection point Q connected to the main body of the absorbent article is set to an angle of 132 to 155 °. And
The protruding length D of the wing-shaped flap in the width direction of the absorbent article is 40 mm or more and 60 mm or less, and the vertex A of the outermost convex portion of the front outer shape line and the apex of the absorbent article passing through the vertex A distance L ₁ between the intersection B of the longitudinal line intersects the rear outline is 30mm or 40mm or less, the length L ₂ of the rear outline is 55mm or 85mm or less, the width direction line of the absorbent article wherein The angle θ formed with the front outline is −10 to 20 °,
The radius of curvature r of the outermost concave portion is not less than 10 mm and not more than 20 mm, and the rear outer shape line excludes a rubbing curve portion formed at an end for connection to an adjacent outer shape line. An absorbent article characterized in that the intermediate portion is an arc-shaped line bulging outward with a radius of curvature R of 150 to 300 mm.   The angle formed between the width direction line of the absorbent article and the rear outline is set to be larger than the angle formed between the width direction line of the absorbent article and the front outline, and the center of gravity of the wing-shaped flap is set. 2. The absorbent article according to claim 1, wherein the eccentric member is biased forward from the center of the joining line between the base of the wing-shaped flap and the main body portion.   The wing-shaped flap has a wingslip-preventive pressure-sensitive adhesive layer on the surface of the back sheet, and is a surface on the liquid-permeable top sheet side of the wing-shaped flap and corresponds to a portion where the wing-slip-resistant pressure-sensitive adhesive layer is provided. The absorbent article according to any one of claims 1 and 2, wherein a mark for a deviation preventing position is formed at the position.

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