JP6884541B2 - Absorbent article - Google Patents

Description

The present invention is an absorbent article mainly used for sanitary napkins, pantyliner sheets, incontinence pads, toiletries, etc., and more specifically, a plurality of inclinations for dispersing wrinkles generated behind the absorbent article when worn. The present invention relates to an absorbent article in which the rear portion of the absorbent article is easily deformed along the body by providing a sanitary napkin groove.

Conventionally, as shown in FIG. 5, as an absorbent article 50 such as a panty liner, a sanitary napkin, and an incontinence pad, an impermeable back sheet 51 such as a polyethylene sheet or a polyethylene sheet laminated non-woven fabric and a non-woven fabric or a permeable material are used. An absorber 53 made of cotton-like pulp or the like is interposed between the liquid-permeable surface sheet 52 such as a absorbent plastic sheet, and the surface of the liquid-permeable surface sheet 52 is squeezed from the outer surface side to make the liquid-permeable surface sheet 52 impermeable. It is known that a squeezing groove 54 is formed which is recessed on the back surface sheet 51 side.

The squeezing groove 54 is generally formed so as to surround the middle and high parts of the absorbent body thickened on the skin side arranged in the region from the blood drainage port to the buttock groove, and is formed of the absorbent article. At the rear, the squeezing groove 54 is formed so that line segments extending in the left and right longitudinal directions are connected to each other at the central portion in the width direction of the absorbent article.

When attaching the absorbent article 50 to the underwear, as shown in FIG. 5, the wing-shaped flaps 55 and 55 projecting on both sides are fixed to the inner surface of the crotch portion of the underwear, and the crotch portion of the underwear is involved. It is folded back to the outer surface side. In this mounted state, the inner portion of the base of the leg receives pressure (leg pressure) from both sides in the width direction to the inside, or along the roundness in the anteroposterior direction of the body, anterior-posterior to the longitudinal direction of the absorbent article 50. By deforming the end portion into a curved shape protruding toward the skin side, the absorbent article is made from a portion in which line segments extending in the left and right longitudinal directions are connected at the center portion in the width direction of the rear end of the squeeze groove 54. Folded wrinkles 56 due to bending of the absorber are likely to be concentrated in one place over almost the entire length in the width direction. The folded wrinkles 56 are formed so that the surface of the absorbent article 50 (liquid permeable surface sheet 52) is recessed on the non-skin side so as to be separated from the skin surface. Therefore, in the folded wrinkles 56, the absorbent article 50 is formed. A gap was created between the surface and the skin surface, and it was easy for body fluids to leak through this gap.

Many improvements have been made to this type of absorbent article to prevent fluid leakage and to make it easier to deform the absorbent article along the shape of the body when worn. There are techniques for forming squeezing grooves recessed toward the side in various forms (for example, Patent Documents 1 and 2 below).

In Patent Document 1 below, a pair of squeezing grooves is formed on the surface sheet side in the rear portion, and one squeezing groove and the other squeezing groove forming the squeezing groove pair are symmetrical with respect to the vertical center line. The squeezing groove is formed and separated from each other in the lateral direction, and the squeezing groove has a convex shape that is convexly curved toward the rear in the vertical direction in a plan view, and has a curved portion and an inner line segment forming the top of the convex. It is composed of an outer line segment, and the inner line segment and the outer line segment extend along a tangent line at the end of a curved portion to which each is connected, and one inner line segment and the other inner line segment are included. The distance between and is gradually decreasing toward the front, and the distance between one outer line segment and the other outer line segment is gradually increasing toward the front. An absorbent article that is longer than the longitudinal length on the inner line segment side is disclosed.

Further, in Patent Document 2 below, a rear compression groove is provided in a rear portion in the longitudinal direction, and the rear compression groove has a pair of lateral compression grooves extending in the width direction of the absorbent article and separated from each other. The lateral compression groove portion of the above is disclosed as an absorbent article formed substantially line-symmetrically with the vertical center line as the axis of symmetry.

Japanese Unexamined Patent Publication No. 2015-167733 Japanese Unexamined Patent Publication No. 2009-77927

However, in the absorbent article described in Patent Document 1, since each of the squeezing groove pairs has a convex shape that curves convexly toward the rear, the top of the convex is used as a base point when the absorbent article is attached. Folded wrinkles along the width direction were likely to be concentrated in one place. Further, the absorbent article described in Patent Document 2 has a pair of lateral compression groove portions extending in the width direction, and fold wrinkles along the width direction concentrated in one place with the pair of lateral compression groove portions as base points. Is likely to occur.

In this way, if the creases due to external force or deformation when the absorbent article is attached are formed in one place, the depth of the creases becomes deeper and the width of the creases becomes larger, causing the creases to break. The adhesion of the wrinkles to the skin surface was significantly reduced, which was a cause of leakage of body fluids.

Therefore, a main object of the present invention is to provide an absorbent article that disperses wrinkles generated behind the absorbent article at the time of wearing, improves the fit to the buttock groove, and prevents leakage of body fluid.

In order to solve the above problems, as the present invention according to claim 1, in an absorbent article in which an absorber is interposed between a liquid-permeable front sheet and a liquid-impermeable back sheet.
A pair of left and right longitudinal squeezing grooves extending in the longitudinal direction of the absorbent article is formed behind the absorbent article, and is separated from the posterior side of the longitudinal squeezing groove and inclined forward toward the outside in the width direction. A plurality of left and right pairs of inclined squeezing grooves are formed at intervals in the longitudinal direction of the absorbent article.
The longitudinal squeezing groove and the inclined squeezing groove are separated from each other on the left and right at the central portion in the width direction of the absorbent article, and the inclined squeezing groove is separated from each other in the longitudinal direction of the absorbent article by 5 to 20 mm. An absorbent article is provided characterized by being arranged.

In the invention according to claim 1, since the longitudinal squeezing groove and the inclined squeezing groove are separated from each other on the left and right at the central portion in the width direction of the absorbent article, the portion connected at the central portion in the width direction is used as the base point. No broken wrinkles are formed. In addition, since the squeezing groove is not formed in the left-right separated portion in the central portion in the width direction, this portion is easily deformed so as to enter the buttock groove when the absorbent article is attached, and the fit to the buttock groove is improved. it can.

Further, in the present absorbent article, a pair of left and right inclined squeezing grooves that are separated from the rear side of the longitudinal squeezing groove and are inclined forward toward the outside in the width direction are 5 to 20 mm in the longitudinal direction of the absorbent article. Since a plurality of folds are formed at intervals, the fold wrinkles are not concentrated in one place but are dispersed behind the absorbent article. Specifically, since a plurality of pairs of inclined squeezing grooves are formed at intervals in the longitudinal direction of the absorbent article, a plurality of small creases are dispersed along these inclined squeezing grooves. Will be done. By dispersing the strain generated by external force such as deformation and leg pressure when the absorbent article is attached in several places instead of concentrating it in one place, the broken wrinkles of the absorbent article are dispersed and formed and concentrated in one place. The depth and width of the individual fold wrinkles are smaller than those of the fold wrinkles formed in the above process, the decrease in adhesion to the skin surface is suppressed, and the leakage of body fluid can be prevented.

In addition, when the absorbent article is attached, the wing-shaped flap is folded back toward the outer surface so as to wrap around the crotch portion of the underwear, so that a tensile force toward the wing-shaped flap acts on the outer edge of the absorbent article in the width direction. Due to the leg pressure from the outside to the inside in the width direction centered on the portion where the wing-shaped flap is formed, the tensile force toward the wing-shaped flap acts on the outer edge in the width direction of the absorbent article. The fold wrinkles formed along the width direction of the absorbent article are formed so as to incline forward toward the outside in the width direction due to the tensile force of the absorbent article (see FIG. 5). Therefore, by providing the inclined squeezing groove along the direction in which the fold wrinkles are likely to be formed, the fold wrinkles generated at the time of mounting are more easily dispersed and formed.

According to the second aspect of the present invention, the inclination angle of the inclined pressing groove defined as the angle formed by the line connecting both ends of the inclined pressing groove and the longitudinal direction line of the absorbent article is 30 to 80 °. the absorbent article of claim 1 Symbol placing it is provided.

In the invention according to claim 2, as described above, the fold wrinkles generated behind the absorbent article due to the tensile force when the wing-shaped flap is folded back are formed so as to be inclined forward toward the outside in the width direction. , An inclined squeezing groove is formed at a predetermined inclination angle along the crease.

According to the third aspect of the present invention, the longitudinal front edge of the inclined squeezing groove is located on the longitudinal front side of the absorbent article from the longitudinal rear edge of the inclined squeezing groove adjacent to the front side. The absorbent article according to any one of claims 1 and 2 located is provided.

In the invention according to claim 3 , the longitudinal front edge of the inclined squeezing groove is positioned on the longitudinal front side of the absorbent article from the longitudinal rear edge of the inclined squeezing groove adjacent to the front side. As a result, the low-rigidity portion where the squeezing groove is not formed in the width direction of the absorbent article is not formed, and the rigidity is increased by the inclined squeezing groove. It will be dispersed and formed along the line.

According to the fourth aspect of the present invention, the longitudinal rear edge of the inclined squeezing groove is positioned with respect to the width direction of the absorbent article as compared with the longitudinal rear edge of the longitudinal squeezing groove. The absorbent article according to any one of claims 1 to 3 , wherein is equal to or outside the same.

In the invention according to claim 4, the position of the rear end edge of the inclined squeezing groove in the longitudinal direction is the same as that of the rear end edge of the longitudinal squeezing groove in the width direction of the absorbent article. By setting it to the outside of the groove, it is easier to form a crease with the posterior edge of the inclined squeezing groove as the base point than with a crease with the posterior edge of the longitudinal squeezing groove as the base point. On the contrary, if the longitudinally posterior edge of the longitudinal squeezing groove is located outside the longitudinally lateral edge of the inclined squeezing groove in the width direction of the absorbent article, this width. Folded wrinkles with the rear edge of the longitudinal squeezing groove located on the outer side of the direction as a base point are likely to be concentrated and formed in one place.

According to the fifth aspect of the present invention, the rear portion of the longitudinal squeezing groove is formed so as to gradually incline inward in the width direction toward the rear side.
The absorbent article according to any one of claims 1 to 4 , wherein the inclination angle of the inclined squeezing groove is formed to be larger than the inclination angle of the rear end edge of the longitudinal squeezing groove.

In the invention according to claim 5 , the inclination angle of the inclined squeezing groove is formed to be larger than the inclination angle of the rear end edge of the longitudinal squeezing groove. As a result, in the inclined squeezing groove having a large inclination angle, the point of action of the bending force (the intersection at the center in the width direction of the extension line of the rear end of the squeezing groove formed in the left and right pairs) becomes closer to the squeezing groove. Folded wrinkles are likely to be formed.

As described in detail above, according to the present invention, wrinkles generated behind the absorbent article at the time of wearing can be dispersed, the fit to the buttock groove is improved, and the leakage of body fluid can be prevented.

It is a partially broken development view of the sanitary napkin 1 which concerns on this invention. FIG. 2 is a view taken along the line II-II of FIG. FIG. 3 is a view taken along the line III-III of FIG. It is an enlarged plan view of the squeeze groove formed behind the sanitary napkin 1. It is a perspective view which shows the conventional absorbent article 50.

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

[Basic structure of sanitary napkin 1]
As shown in FIGS. 1 to 3, the sanitary napkin 1 according to the present invention includes an impermeable back sheet 2 made of a polyethylene sheet or the like, menstrual blood, vaginal discharge, or the like (hereinafter, collectively referred to as a body fluid). ), A absorbent body 4 made of cotton-like pulp or synthetic pulp sandwiched between these two sheets 2 and 3, and a length on both sides on the skin contact surface side. A side non-woven fabric 7 provided over substantially the entire length along the direction is provided, and around the absorber 4, the impermeable back sheet 2 and the liquid permeable front sheet 3 are provided at the upper and lower end edges thereof. The outer edge portion is joined by an adhesive such as hot melt or a joining means such as heat seal or ultrasonic seal, and the impermeable back surface extending laterally from the absorber 4 at both side edges thereof. The sheet 2 and the side non-woven fabric 7 are joined by an adhesive such as hot melt or a joining means such as a heat seal or an ultrasonic seal to form a flap portion in which an absorber does not intervene. In the illustrated example, in order to maintain the shape of the absorber 4 and improve the diffusivity, the absorber 4 is surrounded by an encapsulating sheet 5 made of crepe paper, non-woven fabric, or the like. It does not have to be provided. Further, although not shown, a second sheet made of a hydrophilic non-woven fabric or the like having substantially the same shape as the liquid-permeable surface sheet 3 may be arranged adjacent to the non-skin side of the liquid-permeable surface sheet 3. ..

Hereinafter, the structure of the sanitary napkin 1 will be described in more detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water-shielding property such as polyethylene is used, but it is desirable to use a sheet material having moisture permeability from the viewpoint of preventing stuffiness. The water-impervious / moisture-permeable sheet material has microporous properties obtained by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in the uniaxial or biaxial direction. Sheets are preferably used. One or more adhesive layers (not shown) are formed along the longitudinal direction of the napkin on the non-skin side surface (outer surface) of the impermeable back sheet 2, and the sanitary napkin 1 is worn when attached to the body. It is designed to be fixed to underwear. As the impermeable back sheet 2, a polylami non-woven fabric in which a plastic film and a non-woven fabric are laminated may be used.

Next, as the liquid-permeable surface sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. The material fibers constituting the non-woven fabric can be olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A non-woven fabric obtained by an appropriate processing method such as a method, a spunbond method, a thermal bond method, a melt blown method, or a needle punching method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapeability, and the thermal bond method is excellent in that it is bulky and has high compression stability. When a large number of through holes are formed in the liquid-permeable surface sheet 3, the body fluid is quickly absorbed, and the dry touch property is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but it is preferable to use short fibers in order to give the texture of the towel cloth. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Further, a core-sheath type fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath, a side-by-side type fiber, and a composite fiber of a split type fiber can also be preferably used.

The absorber 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable front sheet 3 is composed of, for example, cotton-like pulp and a water-absorbent polymer. The water-absorbent polymer is mixed in the pulp constituting the absorber, for example, as a granular powder. Examples of the pulp include cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price. The basis weight of the absorber 4 is ^{preferably 250 to 650 g / m 2} , preferably 300 to 400 g / m ² .

In addition, synthetic fibers may be mixed with the absorber 4. As the synthetic fiber, for example, polyolefin-based such as polyethylene or polypropylene, polyester-based such as polyethylene terephthalate and polybutylene terephthalate, polyamide-based such as nylon, and copolymers thereof can be used, and these two types can be used. It may be a mixture. Further, composite fibers such as core-sheath type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath, side-by-side type fibers, and split type fibers can also be used. In the case of hydrophobic fibers, it is desirable to use the synthetic fibers surface-treated with a hydrophilic agent so as to have an affinity for body fluids.

It is preferable to form the middle and high portions 6 of the absorber thickened on the skin side on the skin side surface of the absorber 4. The absorber 4 and the middle and high portions 6 may be manufactured separately and then laminated in an assembly step, or may be integrally formed by three-dimensionally stacking the absorbers. Further, a two-stage stacking structure may be obtained in which the middle and high portions 6 are stacked on the upper stage of the absorber 4. The middle and high parts 6 will be described in detail later.

In the illustrated example, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width of the absorber 4, as shown in the cross-sectional views of FIGS. 2 and 3, and only covers the absorber 4. The outer side of the stop is for the purpose of preventing the penetration of side non-woven fabric 7, which is different from the liquid-permeable surface sheet 3, specifically, menstrual blood, vaginal discharge, etc., or enhancing the feel to the touch. Correspondingly, the side non-woven fabric 7 constructed by using the non-woven fabric material which has been appropriately subjected to water repellent treatment or hydrophilic treatment is arranged. As the side non-woven fabric 7, one made of natural fiber, synthetic fiber, recycled fiber or the like and formed by an appropriate processing method can be used, but preferably, the feeling of stiffness is eliminated and stuffiness is prevented. Therefore, it is preferable to use a non-woven fabric having a low basis weight and having air permeability. Specifically, it is desirable to use a non-woven fabric produced with a basis weight of 13 to 23 g / m ² , and in order to reliably prevent the permeation of body fluids, a silicon-based, paraffin-based, alkylchromic chloride-based water repellent, etc. A water-repellent treated non-woven fabric coated with is preferably used.

As shown in FIGS. 2 and 3, the side non-woven fabric 7 adheres hot melt or the like to the outer portion from the intermediate portion in the width direction over a range from a predetermined inner position to the outer edge of the impermeable back sheet 2. Flap portions in which the absorber 4 does not intervene are formed on both side portions of the absorber 4 by the laminated sheet portions of the side non-woven fabric 7 and the impermeable back sheet 2 which are adhered with an agent. The flap portion is substantially the pair to the absorption body side unit position corresponding to the fluid discharge portion H wing-shaped flaps W, to form a W, which from the buttocks side (rear side) Hip hold flaps W _B to _position, W _B may be formed. These wing-shaped flaps W, W and hip hold flaps W _B, respectively pressure-sensitive adhesive layer on the outer surface side of the W _B (not shown) is provided, proximal to the time of mounting with respect to shorts, the wing-shaped flaps W, and W folded on the opposite side at the folding line RL position of parts, as well as fastened is wound around the crotch portion of the panties, so as to fasten the hip hold flaps W _B to the inner surface of the shorts.

On the other hand, the inner side portion of the side non-woven fabric 7 is folded back substantially in double, and one or more of the double sheets are fixed at appropriate positions at both ends or in the longitudinal direction in the middle portion in the height direction. In the illustrated example, the three thread-like elastic elastic members 9, 9 ... Are arranged in a state where the appropriate positions in both ends or the longitudinal direction are fixed. As shown in FIG. 3, the double sheet portion is adhered to the absorber 4 side in a state where the double sheet portion is folded back once and laminated to the outside as shown in FIG. A pair of left and right three-dimensional gathered BSs and BSs that stand up on the surface side while tilting are formed.

[Middle and high school]
In the sanitary napkin 1, as shown in FIGS. 1 and 2, at least the middle and high portions 6 of the absorber thickened toward the skin are provided in the range from the body fluid discharge portion H to the intergluteal cleft portion of the absorber 4. It is preferable to provide it. The middle and high portions 6 are adjacent to the skin side surface of the absorber 4 and are arranged at the central portion in the width direction of the absorber 4, and are formed to have smaller width and longitudinal dimensions than the absorber 4. The thickness of the middle and high portions 6 is set to 3 to 25 mm, preferably 5 to 18 mm, because if it is too thick, the rigidity increases and the adhesion to the body decreases, and if it is too thin, the adhesion to the body fluid discharge portion H decreases. Is good. Further, the total basis weight of the middle-high portion 6 and the absorber 4 in the portion where the middle-high portion 6 is arranged is preferably 400 to 900 g / m ² , and particularly preferably 600 to 800 g / m ² .

The middle and high portions 6 are provided only in the region including the body fluid discharge portion H of the wearer, in the region including the drainage discharge portion H and the region including the buttocks groove, respectively, or in the region from the body fluid discharge portion H to the buttocks groove. Can be provided continuously in. As an example, as shown in FIG. 1, a middle-high anterior portion 6A provided in the area including the body fluid discharge portion H of the wearer and a middle-high rear portion 6B provided in the region including the buttock groove of the wearer. , The middle-high front portion 6A and the middle-high rear portion 6B are provided in a region connecting the middle-high rear portion 6B in the front-rear direction of the napkin, and can be composed of a middle-high constriction portion 6C in which both side edges are constricted inward.

The middle-high front portion 6A is formed in a region including the body fluid discharge portion H of the wearer, specifically, a region slightly longer on the front side and the rear side than the body fluid discharge portion H. The middle-high front portion 6A is formed in a vertically long shape that is long in the front-rear direction of the napkin, and both side edges are formed by straight lines extending in the front-rear direction of the napkin. The front edge is formed by an arc-shaped curve that bulges toward the front of the napkin.

The middle-high rear portion 6B is formed in a region including a buttock groove of the wearer. Specifically, it is provided in the region from the position where the buttock groove starts on the inseam side of the wearer to the position beyond the buttock groove, the end point position of the buttock groove, or the intermediate position of the buttock groove.

The middle-high rear portion 6B is preferably formed in a tapered shape in which the rear portion gradually narrows toward the rear of the napkin. As a result, the middle-high rear portion 6B can easily penetrate deep into the buttock groove, and the leakage of body fluid along the buttock groove can be prevented. In the illustrated example, this tapered shape starts from the front end of the middle-high rear portion 6B (the boundary with the middle-high constricted portion 6C), but both sides of the middle-high rear portion 6B are placed before and after the napkin by a predetermined length from the front end. After forming a straight line extending in the direction, the tapered shape may start from there.

The middle-high constriction portion 6C is provided in a region connecting the middle-high front portion 6A and the middle-high rear portion 6B in the front-rear direction of the napkin, and the front end of the middle-high constriction portion 6C is continuous with the rear end of the middle-high front portion 6A. The rear end of 6C is continuous with the front end of the middle-high rear portion 6B. The middle-high constriction portion 6C is preferably formed in a curved shape in which the outer lines on both sides bulge inward in the width direction. As a result, it becomes easy to fit the fine irregularities formed on the skin surface from the rear end of the body fluid discharge portion H of the wearer to the start position of the buttock groove, and the adhesion to the skin surface can be improved.

The middle and high part 6 contains at least pulp fibers and synthetic fibers, and is a mixture of the pulp fibers: synthetic fibers at a ratio of 80 to 20:20 to 80, preferably 40 to 60:60 to 40 in terms of weight. Is desirable. In addition, the middle and high portions 6 can contain a water-absorbent polymer. Examples of the water-absorbent polymer include a polyacrylic acid crosslinked product, a self-crosslinked polyacrylic acid salt, a saponified product of an acrylic acid ester-vinyl acetate copolymer crosslinked product, an isobutylene / maleic anhydride copolymer crosslinked product, and a polysulfone. Examples thereof include a crosslinked product, a partially crosslinked product of a water-swellable polymer such as polyethylene oxide and polyacrylamide. Of these, acrylic acid or acrylate-based ones having excellent water absorption and water absorption rate are preferable. In the manufacturing process, the water-absorbing polymer having the water-absorbing performance can adjust the water-absorbing power and the water-absorbing rate by adjusting the cross-linking density and the cross-linking density gradient. Since it is necessary for the middle and high parts 6 to promote penetration into the absorber 4 side, and a so-called gel blocking phenomenon occurs when the blending amount is increased, 1 to 10 in terms of weight with respect to the total weight of the pulp fiber and the synthetic fiber. It is desirable to mix in the ratio of%. If the water-absorbent polymer content exceeds 50%, the entanglement between the pulp fibers is eliminated, the sheet strength is lowered, and tears and cracks are likely to occur, which is not desirable.

[Pressure groove]
In the sanitary napkin 1, the skin contact surface side (outer surface side of the liquid permeable front sheet 3) is directed to the non-skin side (impermeable back sheet 2 side) at the position on the outer side in the vicinity of the middle and high portions 6. A squeezed groove 10 is formed. The squeezing grooves 10 are formed on both sides from a region including at least a portion corresponding to the body fluid draining portion H to a region including a portion corresponding to the buttock groove, respectively. The region including the portion corresponding to the body fluid discharge portion H is the central region in the width direction including all the portions that the wearer's body fluid discharge portion H comes into contact with when the sanitary napkin 1 is worn, and the range in the longitudinal direction of the napkin is If the wing-shaped flaps W are provided on both sides, it roughly corresponds to the longitudinal range of the wing-shaped flaps W. The region including the portion corresponding to the buttock groove is the central region in the width direction including at least a part of the buttock groove of the wearer when the sanitary napkin 1 is worn, and is rearward from the start position of the buttock groove on the inseam side. It is the range up to the middle position of the buttock groove.

In the sanitary napkin 1 shown in FIG. 1, the squeezing groove 10 is substantially longitudinal of the napkin 1 on both side portions from the region including the portion corresponding to the body fluid draining portion H to the region including the portion corresponding to the buttocks groove, respectively. Left and right pairs of anterior longitudinal squeezing grooves 11 and 11 formed continuously along the direction and the anterior longitudinal squeezing grooves 11 are arranged apart from each other on the rear side and both sides of the portion corresponding to the buttock groove. The left and right pairs of rear longitudinal squeezing grooves 12 and 12 formed continuously along the substantially longitudinal direction of the napkin 1 and the anterior longitudinal squeezing grooves 11 and 11 are arranged at intervals from each other. At the same time, the front end crescent-shaped squeezing groove 13 having a crescent shape formed along the substantially width direction of the napkin 1 across the longitudinal center line of the napkin 1 and the rear longitudinal squeezing groove 12; From the left and right pair of inclined squeezing grooves 14, 14, etc., which are arranged apart from each other on the rear side of the twelve, are inclined to the front side toward the outside in the width direction, and are formed at intervals in the longitudinal direction of the napkin. It is configured. In the illustrated example, the anterior longitudinal squeezing groove 11 and the posterior longitudinal squeezing groove 12 are arranged apart from each other in the longitudinal direction, but the anterior longitudinal squeezing groove 11 and the posterior longitudinal squeezing groove 12 are arranged. It may be a continuous longitudinal squeezing groove from the region including the portion corresponding to the body fluid draining portion H to the portion corresponding to the buttock groove.

As shown in FIG. 1, the front longitudinal squeezing groove 11 is arranged at least on both sides of the middle-high front portion 6A and the middle-high constriction portion 6C, and up to a position where the rear end portion slightly touches the middle-high rear portion 6B. It is postponed.

Further, as shown in FIG. 1, the rear longitudinal squeezing grooves 12 are arranged in pairs on both sides of the middle-high rear portion 6B, respectively. The rear longitudinal squeezing groove 12 is arranged in a range shorter than the longitudinal length of the napkin of the middle-high rear portion 6B. That is, the front end of the middle-high rear portion 6B is located on the front side of the front end of the rear longitudinal squeezing groove 12, and the rear end of the middle-high rear portion 6B is located on the rear side of the rear end of the rear longitudinal squeezing groove 12. ..

The rear longitudinal squeezing groove 12 has a separating portion 15 whose rear end is separated from the left and right, as shown in detail in FIG. Further, the rear end of the middle and high portion 6 is located behind the rear end of the rear end of the rear longitudinal pressing groove 12 in the longitudinal direction of the napkin. That is, the rear ends of the middle and high portions 6 are arranged so as to project rearward from the separation portions 15 at the rear ends of the left and right rear longitudinal squeezing grooves 12 and 12. It is preferable that the rear portion of the rear longitudinal pressing groove 12 is formed so as to gradually incline inward in the width direction toward the rear side. That is, it is preferable to form the left and right rear longitudinal squeezing grooves 12 and 12 so that the separation width gradually decreases toward the rear side.

The rear portion of the rear side longitudinal squeezing groove 12 may be a straight line along the longitudinal direction of the napkin, an inclined line gradually inclining outward in the width direction toward the rear side, or the like, but gradually inward in the width direction toward the rear side. It is preferably formed by an inclined line.

As shown in FIG. 4, when the rear portion of the rear longitudinal squeezing groove 12 is formed by an inclined line gradually inclining inward in the width direction toward the rear, the rear end of the rear longitudinal squeezing groove 12 is formed. The angle (inclination angle α) formed by the tangential direction of the sanitary napkin 1 and the longitudinal direction line S of the sanitary napkin 1 is preferably smaller than the inclination angle β of the inclined squeezing groove 14 as described in detail later.

A plurality of left and right pairs of inclined squeezing grooves 14, 14 ... that are separated from the rear side of the posterior longitudinal squeezing groove 12 and are inclined forward toward the outside in the width direction are formed at intervals in the napkin longitudinal direction. There is. The inclined squeezing groove 14 is formed symmetrically with respect to the longitudinal center line CL of the sanitary napkin 1, and has a separating portion 16 that is separated to the left and right at least at the central portion in the width direction of the napkin on the longitudinal center line CL. doing.

Therefore, in the sanitary napkin 1, the rear longitudinal squeezing groove 12 and the inclined squeezing groove 14 are separated to the left and right at the central portion in the width direction of the sanitary napkin 1, and thus are connected at the central portion in the width direction. No creases or wrinkles occur from the portion that has been removed. Further, since the squeezing groove is not formed in the portion separated from the left and right in the central portion in the width direction, this portion enters the buttock groove when the leg pressure from both sides in the width direction acts inward when the sanitary napkin 1 is attached. It becomes easy to deform and the fit to the buttock groove is improved.

Further, in the sanitary napkin 1, a pair of left and right inclined squeezing grooves 14 that are separated from the posterior side of the posterior longitudinal squeezing groove 12 and are inclined forward toward the outside in the width direction are provided in the longitudinal direction of the sanitary napkin 1. Since a plurality of napkins are formed at intervals, the broken wrinkles are not concentrated in one place but are dispersed behind the sanitary napkin 1. Specifically, since a plurality of left and right pairs of inclined squeezing grooves 14 are formed at intervals in the longitudinal direction of the sanitary napkin 1, a plurality of bent wrinkles are dispersed around these inclined squeezing grooves 14 as an axis. Will be formed. By forming the fold wrinkles in a plurality of dispersed manners, the depth and width of the individual fold wrinkles are smaller than in the case where the fold wrinkles are concentrated in one place, and the adhesion to the skin surface is improved. The decrease is suppressed, and the leakage of body fluid can be prevented.

The inclined squeezing groove 14 is formed so as to be inclined forward toward the outside in the width direction of the sanitary napkin 1. This is the direction along the direction of the fold wrinkles formed when the sanitary napkin 1 is attached. When the sanitary napkin 1 is attached, as described above, the wing-shaped flaps W and W are folded back toward the impermeable back sheet 2 at the folding line RL position at the base end, and are wrapped around the crotch portion of the shorts to be fastened. Therefore, a tensile force toward the wing-shaped flap W acts on the outer end portion of the sanitary napkin 1 in the width direction. Further, due to the leg pressure from both sides in the width direction centered on the formation positions of the wing-shaped flaps W and W toward the inside, a tensile force toward the wing-shaped flaps W also acts on the outer edge of the sanitary napkin in the width direction. .. Due to these tensile forces, the fold wrinkles formed along the width direction behind the sanitary napkin 1 are formed in an inclined shape that gradually inclines forward toward the outside in the width direction (see FIG. 5). ). Therefore, by forming the inclined squeezing groove 14 so as to be inclined forward toward the outside in the width direction of the sanitary napkin 1, the inclined direction of the inclined squeezing groove 14 is formed along the creases at the time of mounting. Become so.

The range in the longitudinal direction of the napkin in which the inclined squeezing groove 14 is provided is preferably a front-back range centered on the start position where the buttocks on the inseam side come into contact with the wearer while lying on his back with his legs extended. Since this range is a portion where the deformation of the sanitary napkin 1 in the longitudinal direction suddenly changes while lying on its back, it is likely to cause creases when worn, and the effect of the present invention is likely to be exhibited.

As shown in FIG. 4, the inclined squeezing groove 14 preferably has a longitudinal interval (pitch P) of the sanitary napkin 1 of 5 to 20 mm, preferably 10 to 15 mm. As a result, the broken wrinkles are finely dispersed and formed along each inclined pressing groove 14. If the pitch P is less than 5 mm, the napkin is less likely to be deformed, and the rear part of the napkin is less likely to be curved along the buttock groove or the roundness of the buttock. Further, if it is larger than 20 mm, it becomes difficult to form fine creases along each inclined pressing groove 14. The pitch P does not have to be constant, and can be gradually changed or arbitrarily set depending on the portion within the above range.

The inclined squeezing groove 14 is formed in a plurality of pairs of two or more with respect to the longitudinal direction of the sanitary napkin 1. It is preferably 3 to 8 pairs, more preferably 3 to 5 pairs. By forming a plurality of pairs of inclined squeezing grooves 14 separated from each other in the longitudinal direction, fold wrinkles along the inclined squeezing grooves 14 are formed at several points in the longitudinal direction of the napkin. , Individual creases become finer and smaller.

As shown in FIG. 4, the inclination angle β of the inclined squeezing groove 14 preferably has an angle formed by the longitudinal direction line S of the sanitary napkin 1 of 30 to 80 °, preferably 45 to 65 °. .. By setting this angle range, the inclined squeezing groove 14 is formed substantially along the direction of the fold wrinkle at the time of mounting. If the inclination angle β is smaller than 30 °, the inclined squeezing groove 14 may overlap with the posterior longitudinal squeezing groove 12 arranged on the front side, and the squeezing grooves 12 and 14 are too close to each other and have extremely high rigidity. Therefore, the fit may be reduced. On the other hand, if the temperature is larger than 80 °, there will be a low-rigidity portion in which the inclined squeezing groove 14 is not formed in the width direction of the napkin, and creases will occur along the low-rigidity portion.

As shown in the illustrated example, the planar shape of the inclined squeezing groove 14 is preferably substantially a straight line that is substantially the same as the fold wrinkles formed, but is a curved or fold line that protrudes to the front side or the rear side in the longitudinal direction of the napkin. It may be formed in a shape. However, when it is formed in a curved shape or a polygonal line, the top of the protrusion does not protrude outward from both ends of the inclined squeezing groove 14 in the longitudinal direction of the napkin in order to prevent the protrusion from becoming a bending base point. It is preferable to set it to. The inclination angle β when formed in a curved or polygonal line shape may be the angle formed by the line connecting both ends of the inclined squeezing groove 14 and the longitudinal direction line S.

The left and right pairs of inclined squeezing grooves 14 and 14 have a separation width B at the center in the width direction of the sanitary napkin 1 of 20 to 40 mm, preferably 27 to 33 mm. If it is smaller than 20 mm, thick creases are likely to be formed in the width direction in the same way that the left and right pairs of inclined squeezing grooves 14 and 14 are connected at the central portion in the width direction. It becomes narrower, and the effect of providing the inclined pressing groove 14 may not be sufficiently exhibited.

As shown in FIG. 4, the longitudinally front end edge 14b of the inclined squeezing groove 14 is the longitudinal length of the sanitary napkin 1 from the longitudinally posterior end edge 14a of the inclined squeezing groove 14 adjacent to the front side. It is preferable to arrange it so as to be located on the front side in the direction. In other words, the inclined squeezing grooves 14 and 14 adjacent to each other in the front-rear direction are preferably arranged so as to have an overlap margin in the width direction of the sanitary napkin 1. As a result, a low-rigidity portion that is not reinforced by the inclined squeezing groove 14 is not formed in the width direction of the sanitary napkin 1, so that wrinkles due to mounting are surely dispersed along the plurality of inclined squeezing grooves 14. Will be formed.

Similar to the arrangement of the inclined squeezing grooves 14, 14 that are separated from each other in the front-rear direction, the distal edge 14b on the front side in the longitudinal direction of the inclined squeezing groove 14, which is located on the foremost side of the inclined squeezing grooves 14, 14 ... , It is preferable to arrange the sanitary napkin 1 so as to be located on the front side in the longitudinal direction of the sanitary napkin 1 from the rear edge 12a of the posterior longitudinal squeezing groove 12.

The longitudinally rear end edge 14a of the inclined squeezing groove 14 has the same position with respect to the width direction of the sanitary napkin 1 as compared with the longitudinally posterior end edge 12a of the posterior longitudinal squeezing groove 12. It is preferably outside or above. The fold wrinkles extending outward in the width direction of the sanitary napkin 1 are likely to be formed with the one located on the outside in the width direction as a base point, and the end edge 14a on the rear side (inside in the width direction) of the inclined squeezing groove 14 is on the rear side. By arranging the longitudinal squeezing groove 12 on the outer side in the width direction equal to or larger than the end edge 12a on the rear side in the longitudinal direction, it becomes easy to surely form fold wrinkles finely dispersed along each inclined squeezing groove 14. , The central portion of the formed range of the inclined squeezing groove 14 in the width direction is easily raised toward the skin side, and the fit with the buttock groove is improved. Here, the amount of positional deviation C in the width direction of the sanitary napkin 1 between the longitudinally rear end edge 14a of the inclined squeezing groove 14 and the longitudinally posterior end edge 12a of the posterior longitudinal squeezing groove 12. Is preferably 0 to 10 mm, preferably 0 to 3 mm.

The inclination angle β of the inclined squeezing groove 14 and the inclination angle α of the rear end edge 12a of the rear longitudinal squeezing groove 12 are preferably formed so as to have a relationship of β> α. The larger the inclination angle of the squeeze groove, the more the point of action of the bending force (the extension line T that extends the rear end of the squeeze groove formed in pairs on the left and right (the tangent line of the rear end in the case of a curved squeeze groove). (Intersections that intersect on the center line CL in the longitudinal direction) are located near the squeezing groove, and fold wrinkles along the squeezing groove are likely to be formed from this point of action as a base point. Therefore, finely dispersed fold wrinkles are likely to be formed along the plurality of inclined squeezing grooves 14, 14 ... With a relatively large inclination angle.

1 ... Sanitary napkin, 2 ... Impermeable back sheet, 3 ... Liquid permeable front sheet, 4 ... Absorber, 5 ... Encapsulation sheet, 6 ... Middle and high part, 7 ... Side non-woven fabric, 9 ... Filamentous elastic elastic member 10, 10 ... squeezing groove, 11 ... anterior longitudinal squeezing groove, 12 ... posterior longitudinal squeezing groove, 13 ... front end crescent squeezing groove, 14 ... inclined squeezing groove, 15.16 ... separation part

Claims (5)

In an absorbent article in which an absorber is interposed between a liquid-permeable front sheet and a liquid-impermeable back sheet,
A pair of left and right longitudinal squeezing grooves extending in the longitudinal direction of the absorbent article is formed behind the absorbent article, and is separated from the posterior side of the longitudinal squeezing groove and inclined forward toward the outside in the width direction. A plurality of left and right pairs of inclined squeezing grooves are formed at intervals in the longitudinal direction of the absorbent article.
The longitudinal squeezing groove and the inclined squeezing groove are separated from each other on the left and right at the central portion in the width direction of the absorbent article, and the inclined squeezing groove is separated from each other in the longitudinal direction of the absorbent article by 5 to 20 mm. An absorbent article characterized by being placed. Absorption of the inclined angle of the inclined compression grooves inclined compression groove which is defined as the angle formed at both ends and the line connecting the longitudinal lines of the absorbent article is a 3 0 to 80 ° according to claim 1 Symbol placement Sex goods. Claims 1, 2 that the longitudinal front edge of the inclined squeezing groove is located on the longitudinal front side of the absorbent article from the longitudinal rear edge of the inclined squeezing groove adjacent to the front side. Absorbent article according to any. Claims that the longitudinally posterior edge of the slanted squeeze groove is at or outside the widthwise position of the absorbent article as compared to the longitudinal posterior edge of the longitudinal squeeze groove. Item 2. The absorbent article according to any one of Items 1 to 3. The rear portion of the longitudinal squeezing groove is formed so as to gradually incline inward in the width direction toward the rear side.
The absorbent article according to any one of claims 1 to 4 , wherein the inclination angle of the inclined squeezing groove is formed to be larger than the inclination angle of the rear end edge of the longitudinal squeezing groove.

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