JP5616185B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner, and an incontinence pad for absorbing menstrual blood, cages and the like, and relates to an absorbent article that improves adhesion to the body and reduces leakage.

  Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable surface such as a nonwoven fabric or a liquid-permeable plastic sheet. A sheet in which an absorbent body made of cotton-like pulp or the like is interposed between the sheet and the sheet is known.

Numerous improvements have been made on this type of absorbent article, and various means for preventing body fluid leakage have been taken. As one of these body fluid leakage preventing means, there is a technique for forming a concave groove by hot embossing. For example, in Patent Document 1 below, the left side, the right side, the front side, and the rear side in the width direction left side, the width direction right side, the longitudinal direction front side, and the longitudinal direction rear side, respectively, on the skin contact surface side in the absorbent layer in plan view. A groove is provided, the left groove and the right groove are each convexly curved outward in the width direction, the front groove and the rear groove are each curved concavely outward in the longitudinal direction, and the left groove and The front groove, the left groove and the rear groove, the right groove and the front groove, and the right groove and the rear groove are separated from each other, and the front end portion of the left groove and the front end portion of the right groove are the rear ends of the front groove. Disclosed is an absorbent article that is located on the front side in the longitudinal direction from the portion, and the rear end portion of the left groove and the rear end portion of the right groove are located on the rear side in the longitudinal direction from the front end portion of the rear groove. Has been.

  Moreover, in the following patent document 2, a pair of grooves are provided on both sides in the longitudinal direction on the skin contact surface side of the absorbent layer, and the pair of grooves are in relation to a center line extending in the longitudinal direction of the absorbent layer. Each of the pair of grooves is formed so as to be convexly convex outward in the width direction in the center region in the longitudinal direction, and each of the pair of grooves is formed in the longitudinal direction. An absorbent article is disclosed that extends from a central region to a front part and a rear part and has a portion that is constricted inward in the width direction in at least one direction before and after the longitudinal central region.

JP 2007-195665 A JP 2006-325639 A

  In each of the absorbent articles described in Patent Literatures 1 and 2, a pair of grooves (a left groove and a right groove) are formed by a curved line that extends along the substantially front-rear direction of the absorbent article and outward in the width direction. With the groove, the blood discharge port of the absorbent article is raised to the skin surface side by leg pressure from both sides during wearing. Furthermore, in the absorbent article described in Patent Documents 1 and 2, a substantially arc-shaped emboss is formed continuously or separately before and after the pair of grooves (the left groove and the right groove). The area surrounded by the arc-shaped emboss is raised toward the skin side.

  However, since the bulge in the central part and the bulges in the front and rear parts are caused by the action of each emboss, the bulge in the central part is often insufficient, and the adhesion between the skin and the surface of the absorbent article It was a cause of leakage due to the decline.

  Then, the main subject of this invention is providing the absorbent article which improved the adhesiveness to the blood drain outlet part during mounting | wearing, and aimed at the leakage reduction.

In order to solve the above problems, as the present invention according to claim 1, in an absorbent article in which an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet,
A pair of left and right fit embosses formed by one or a plurality of arc-shaped curves that protrude along the substantially front-rear direction of the absorbent article on both sides across the body fluid discharge site of the absorbent article, and outward in the width direction, Each of the four points close to or in contact with the front and rear ends of the fit emboss is one or a plurality of arcuate curves convex toward the body fluid discharge site , and is sandwiched by the fit emboss with a size smaller than the fit emboss. For the purpose of promoting bulge to generate a compressive force toward the body fluid discharge site side by leg pressure from both sides of the region, and to promote the bulge to the surface side of the drainage mouth corresponding region sandwiched by the fit emboss together and the embossed provided, it said raised promoting embossing, set so as to have an overlap margin in the longitudinal direction of the fitting embossed with the absorbent article Absorbent article, wherein is provided that is.

In the first aspect of the present invention, the absorbent article is formed by one or a plurality of arcuate curves that extend along the substantially front-rear direction of the absorbent article and protrude outward in the width direction on both sides of the body fluid discharge site of the absorbent article. A pair of left and right fit embosses, and one or a plurality of arcuate curves that protrude toward the body fluid discharge site side at four locations close to or in contact with the front and rear ends of these fit embosses. Since the small embossing embossment is provided, the blood drainage-corresponding region sandwiched between the fit embosses rises to the surface side due to leg pressure from both sides during wearing, and is provided at the front and rear ends thereof The raised embossing for embossing generates a compressive force toward the body fluid discharge site side with respect to the region sandwiched by the fit emboss, and is sandwiched by the fit emboss It is adapted to facilitate a raised to the surface side of the Haitian port corresponding region. For this reason, this raised blood drainage port corresponding region can be securely adhered to the blood drainage port part during mounting, and leakage can be reduced.

In addition, by providing the embossment for promotion of protrusions so as to have an overlap margin in the front-rear direction of the fit embossment and the absorbent article, the compressive force toward the body fluid discharge site side of the embossment for elevation promotion is sandwiched between the fit embossments. It becomes easy to convey to the region, and this region can be raised to the surface side.

As the present invention according to claim 2 , wing-shaped flaps are formed on both side portions of the absorbent article, which are fixed by folding back the base end portion at the time of mounting and winding the crotch portion of the underwear,
The fitting embossments The absorbent article of claim 1 Symbol placement are formed within each 20mm~40mm in the longitudinal direction from the central portion of the base end portion fold line of the wing-shaped flaps are provided.

As the present invention according to claim 3 , wing-like flaps are formed on both side parts of the absorbent article to be fixed by folding back the crotch part of the underwear by folding back the base end part at the time of wearing,
The fit embossing and ridges facilitate embossing, the absorbent article according to claim 1 Symbol placement are formed within each 40mm~60mm in the longitudinal direction from the central portion of the base end portion fold line of the wing-shaped flaps provided Is done.

The invention described in claims 2 and 3 defines a preferable formation range of each emboss in consideration of a body size and the like.

As the present invention according to claim 4 , the absorbent article according to any one of claims 1 to 3 , wherein the absorber is provided with an emboss from the back side in a region corresponding to the region sandwiched between the fit embosses. Is provided.

In the invention according to claim 4, by providing embossing from the back side of the absorber corresponding to the region sandwiched between the fit embosses, the back side embossing is used as a flexible shaft, and the absorber is surfaced. It is curved to the side to make it easy to rise.

  As described above in detail, according to the present invention, adhesion to the blood drainage port portion is improved during wearing, and leakage can be reduced.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the cross-sectional view (II-II arrow directional view). It is a top view which shows the direction of the stress which acts on the sanitary napkin 1 in mounting | wearing. It is a top view which shows the dimension of embossing. It is an expanded view of the sanitary napkin 1 which concerns on another form. It is a top view which shows the example (A) (B) which comprised the fit embossing 8 by the combination of several arc-shaped curves. It is a top view which shows the example (A) (B) which comprised the embossing 9 for a protrusion promotion by the combination of a some arcuate curve.

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

  As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the present invention has a liquid-impervious back sheet 2 made of a polyethylene sheet and the like, and a liquid-permeable surface that allows permeation of blood or vaginal discharge quickly. Sheet 3, absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between both sheets 2, 3, encapsulating sheet 5 that preferably surrounds the absorbent body 4, and both sides on the surface side Are mainly composed of side nonwoven fabrics 7, 7 formed along the longitudinal direction.

  In the periphery of the absorbent body 4, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are joined at the upper and lower edge portions thereof by an adhesive such as hot melt or a joining means such as heat seal. In addition, the liquid-impervious back sheet 2 and the side nonwoven fabric 7 that extend laterally from the absorbent body 4 at both side edges thereof are bonded by an adhesive such as hot melt or a bonding means such as heat seal. Wing-like flaps W, W projecting sideways are formed by a composite sheet portion made of the liquid-impermeable back sheet 2 and the side nonwoven fabric 7. The wing-shaped flaps W, W are provided with an adhesive portion (not shown) on the outer surface side (the liquid-impermeable back sheet 2 side), and on the opposite side at the position of the fold line RL at the base end when attached to the undergarment. The sanitary napkin 1 is fastened by wrapping around the crotch portion of the underwear.

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

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric, a porous plastic sheet, or the like is used, but it is preferable to use a nonwoven fabric in order to enhance the embossing effect described in detail later. As the material fibers constituting the nonwoven fabric, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, natural fibers such as cotton, and air through Nonwoven fabric obtained by an appropriate processing method such as a method, an airlaid method, a spunlace method, a spunbond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the air-through method is excellent in terms of being bulky and soft.

  The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

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

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

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

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

  A hydrophilic second sheet (not shown) may be disposed between the liquid-permeable surface sheet 3 and the absorber 4. The second sheet only needs to be hydrophilic with respect to body fluids. Specifically, the second sheet has hydrophilicity in the material itself by using regenerated fibers such as rayon and cupra, and natural fibers such as cotton. It is possible to use fibers obtained by subjecting synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, and polyamides, to surface treatment with a hydrophilizing agent to impart hydrophilicity, or a film material that has been subjected to a number of opening treatments. it can.

(Embossed structure)
As shown in FIG. 1, the sanitary napkin 1 is formed on both sides of the body fluid discharge site H along a substantially arcuate curve that extends along the substantially front-rear direction of the sanitary napkin 1 and outward in the width direction. A pair of left and right fit embosses 8 and 8 and four locations adjacent to the front and rear ends of the fit embosses 8 and 8 are arcuate curves convex toward the body fluid discharge site H side, and are smaller than the fit emboss 8 Are provided with embosses 9, 9. The fit embosses 8 and 8 are formed in substantially the same range in the front-rear direction centering on the body fluid discharge site H.

  In the sanitary napkin 1, by providing the fit embosses 8, 8, as shown in FIG. 3, a region sandwiched between the fit embosses 8, 8 due to leg pressure from both sides during wearing (the blood drainage port) Corresponding regions 12) are raised on the surface side. Further, the embossing for embossing 9 provided in the vicinity of the front and rear of the fit embosses 8 and 8 discharges body fluid from the front and rear ends with respect to the blood discharge port corresponding region 12 by leg pressure from both sides during wearing. Stress toward the region H is generated to promote the uplift to the surface side of the blood discharge port corresponding region 12.

  Further, the blood discharge port corresponding region 12 sandwiched between the fit embosses 8 and 8 is deformed so as to be exactly raised on the surface side by the fit embosses 8 and 8 and the embossing for embossing 9. The twist is suppressed, and it becomes difficult for the lowering of adhesion and the occurrence of discomfort due to the twist to occur. Furthermore, since the embossment 9 for promoting bulging is formed by a convex arcuate curve toward the body fluid discharge site H, leg pressure from both sides can be easily converted into a compressive force toward the body fluid discharge site H. .

  Here, it is preferable that the fit embossing 8 and the embossing embossing 9 are separated from each other. By providing the embosses 8 and 9 apart from each other, the blood discharge port corresponding region 12 can be reliably raised to the surface side with the front and rear end portions of the fit emboss 8 as a base point. Further, as shown in the illustrated example, by providing the bulge promoting embosses 9 and 9 facing each other with the front-rear direction center line CL as a boundary, the compressive force due to leg pressure from both sides is caused by the respective bulge promoting embosses 9. It is designed to work independently.

  Moreover, as shown in FIG. 4, the embossment 9 for promoting bulging is preferably provided so as to have an overlap margin D in the front-rear direction of the fit emboss 8 and the sanitary napkin 1. Specifically, the embossing for embossing 9, 9 formed on the front side of the sanitary napkin 1 will be described as an example. The front end 8 a of the fit embossing 8 is formed with respect to the longitudinal direction of the sanitary napkin 1. By providing between the front end portion 9a and the rear end portion 9b, the overlap margin D is formed. By providing the overlap allowance D, the compressive force toward the body fluid discharge site H side of the embossment 9 for promoting bulge is easily transmitted to the blood discharge port corresponding region 12, and this region 12 is more easily raised to the surface side. .

  Next, the dimensions of the embosses 8 and 9 in consideration of the body dimensions will be described with reference to FIG. The fit emboss 8 is formed in a range of L1 = 20 mm to 40 mm in the front-rear direction from the center point P of the fold line RL of the wing-shaped flap W. Further, the fit emboss 8 and the embossing 9 for promoting the protrusion are formed in the range of L2 = 40 mm to 60 mm in the front-rear direction from the center point P, respectively. Further, the separation width S1 between the apexes in the width direction of the fit embosses 8 and 8 formed by the arc-shaped curve convex toward the outer side in the width direction is the width S (the surface sheet 3 is exposed to the surface side in a plan view of the product state. It is set to 0.6S-0.9S with respect to the separation width S) between the inner edges of the side nonwoven fabrics 7, 7 on both sides. In addition, as for the groove width of each emboss 8 and 9, 1.5-2.0 mm is suitable.

  The embosses 8 and 9 are applied from the surface side of the top sheet 3 after laminating the top sheet 3 (second sheet as required) on the absorber 4.

  By the way, as shown in FIG. 5, the absorber 4 is provided with a back-side emboss 10 from the back side to a region corresponding to the blood discharge port corresponding region 12 sandwiched between the fit embosses 8, 8. Can do. As shown in the illustrated example, the back side emboss 10 is on a line connecting the front and rear ends of the left and right fit embosses 8 and 8 so as to intersect at the center of the blood drainage port corresponding region 12. It can be applied continuously or discontinuously. This makes it easier for the absorbent body to bend and bend upward with the back-side embossed 10 as a flexible axis. Especially when the back-side embossed 10 and 10 are crossed, the blood outlet corresponding to this intersection Since the blood discharge port corresponding region 12 rises to the surface side with the central portion of the region 12 as an apex, the adhesion to the blood discharge port portion being worn is improved.

  When the back surface emboss 10 is applied, after the back surface emboss 10 is applied to the absorbent body 4, the top sheet 3 is laminated, and the fit emboss 8 and the bulging promotion emboss 9 are applied from the front surface side of the top sheet 3. . In addition, the said back surface side embossing 10 can also be provided only to the absorber 4, and when the absorber 4 is surrounded by the covering sheet 5, it can also be provided from the outer surface side of the covering sheet 5.

(Modified example of emboss 8, 9)
In the above embodiment, the fit emboss 8 is configured by one arcuate curve, and the uplifting embossing 9 is configured by one arcuate curve, but the fit embossing 8 and the uplifting embossing 9 are A combination of a plurality of arcuate curves may be used.

  For example, FIG. 6A shows an example in which the fit emboss 8 is formed by a combination of two arcuate curves that are convex outward in the width direction, and FIG. 6B shows the fit emboss 8 facing outward in the width direction. It is the example comprised by the combination of three convex arcuate curves.

  FIG. 7A shows an example in which the uplifting embossing 9 is formed by two arcuate curves convex toward the body fluid discharge site, and FIG. 7B shows the uplifting embossing 9 discharged from the body fluid. It is the example comprised by three arc-shaped curves convex toward the site | part side. Further, the fit emboss 8 may be configured by a combination of a plurality of arcuate curves that are convex outward in the width direction, and the embossing embossment 9 may be configured by a plurality of arcs that are convex toward the body fluid discharge site. Good (not shown).

(Other examples)
(1) In the above-described embodiment, the so-called daytime sanitary napkin 1 in which the body fluid discharge site H is located at the substantially central portion in the front-rear direction has been described. However, the body fluid discharge site H is biased forward and so-called night is long. The same can be applied to the sanitary napkin 1 for use.
(2) In the above embodiment, the fit emboss 8 and the bulge promoting emboss 9 are provided separately from each other, but the bulge promoting emboss 9 is provided in contact with the four positions at the front and rear ends of the fit emboss 8 respectively. You may do it.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 4 ... Absorber, 5 ... Encapsulating sheet, 7 ... Side nonwoven fabric, 8 ... Fit embossing, 9 ... Embossing promotion 10 ... Back side embossing, 12 ... Blood outlet corresponding area

Claims (4)

In the absorbent article in which the absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impermeable back sheet,
A pair of left and right fit embosses formed by one or a plurality of arc-shaped curves that protrude along the substantially front-rear direction of the absorbent article on both sides across the body fluid discharge site of the absorbent article, and outward in the width direction, Each of the four points close to or in contact with the front and rear ends of the fit emboss is one or a plurality of arcuate curves convex toward the body fluid discharge site , and is sandwiched by the fit emboss with a size smaller than the fit emboss. For the purpose of promoting bulge to generate a compressive force toward the body fluid discharge site side by leg pressure from both sides of the region, and to promote the bulge to the surface side of the drainage mouth corresponding region sandwiched by the fit emboss together and the embossed provided, it said raised promoting embossing, set so as to have an overlap margin in the longitudinal direction of the fitting embossed with the absorbent article Absorbent article characterized in that it is. Wing-like flaps are formed on both sides of the absorbent article, which are fixed by folding back the crotch part of the underwear by folding back the base end part at the time of wearing,
The fitting embossments The absorbent article of claim 1 Symbol placement are formed within each 20mm~40mm in the longitudinal direction from the central portion of the base end portion fold line of the wing-shaped flaps. Wing-like flaps are formed on both sides of the absorbent article, which are fixed by folding back the crotch part of the underwear by folding back the base end part at the time of wearing,
The fit embossing and ridges facilitate embossing, the absorbent article according to claim 1 Symbol placement are formed within each 40mm~60mm in the longitudinal direction from the central portion of the base end portion fold line of the wing-shaped flaps. The absorbent article according to any one of claims 1 to 3 , wherein the absorbent body is provided with an emboss from the back side in a region corresponding to a region sandwiched between the fit embosses.

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