JP2021013676A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which appropriately maintains a structure of an absorbent article when used and is excellent in wear feelings.SOLUTION: An absorbent article 1 places an absorber 7 between a skin surface side sheet 2 and a non-skin surface side sheet 6. The absorbent article 1 has a front part F, a rear part R, and an intermediate part M between them in a back and forth direction y. In both end parts in a width direction x, a margin part 9 where there is no absorber 7 is formed. The skin surface side sheet 2 and the non-skin surface side sheet 6 are adhered to each other in the margin part 9. Peel strength between the skin surface side sheet 2 and the non-skin surface side sheet 6 in the margin part 9 is higher in the intermediate part M than in the front part F and the rear part R. In the absorbent article 1, an adhesive application quantity per unit area of the margin part 9 may be larger in the intermediate part M than in the front part F and the rear part R, and adhesive application density of the margin part 9 may be higher in the intermediate part M than in the front part F and the rear part R.SELECTED DRAWING: Figure 1

Description

The present invention relates to absorbent articles such as disposable diapers, urine pads (including incontinence pads), sanitary napkins and the like.

Absorbent articles such as disposable diapers and urine pads are assembled by joining various members with an adhesive or the like. For example, in Patent Document 1, an absorption core, a top sheet covering the wearer side of the absorption core, a back sheet covering the side opposite to the wearer side of the absorption core, and both sides of the top sheet in the width direction are arranged. With sidesheets, the topsheet is glued to the backsheet around the absorbent core, and the sidesheets are glued to the backsheet over almost the entire length of the longitudinal direction as well as both ends in the longitudinal direction. An absorbent article bonded to the top sheet is disclosed in the section.

Japanese Unexamined Patent Publication No. 2008-245960

The absorbent article is required to be appropriately bonded to each other with an adhesive or the like, whereby the structure of the absorbent article is suitably maintained during use, and urine or the like is used. Leakage can be prevented. On the other hand, when the amount of the adhesive applied is increased in order to make the structure of the absorbent article firm, the absorbent article may become hard to the touch and the wearing feeling may be deteriorated. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an absorbent article in which the structure of the absorbent article is appropriately maintained during use and the absorbent article is excellent in wearing comfort.

The absorbent article of the present invention that could solve the above-mentioned problems is an absorbent article in which an absorber is arranged between the skin surface side sheet and the non-skin surface side sheet, and the absorbent articles are front and back. It has a front part and a rear part in the direction and an intermediate part between them, and margin parts without an absorber are formed at both ends in the width direction, and the skin side sheet and the non-skin side sheet are mutually in the margin part. The peeling strength between the skin surface side sheet and the non-skin surface side sheet at the margin portion is characterized in that the intermediate portion is higher than the front portion and the rear portion. In the absorbent article of the present invention, the amount of adhesive applied per unit area of the margin portion may be larger in the intermediate portion than in the front portion and the rear portion, and the adhesive coating density of the margin portion is increased. The middle part may be higher than the front part and the rear part.

In the absorbent article of the present invention, the peel strength of the margin portion is formed higher in the middle portion than in the front portion and the rear portion, and the amount of adhesive applied per unit area of the margin portion is higher than that in the front portion and the rear portion. Since the middle part is formed more and the adhesive application density of the margin part is formed higher in the middle part than in the front part and the rear part, the wearer's thigh is formed when the absorbent article is attached. It is less likely that the absorbent material contained in the absorber will flow out of the absorbent article from the margin portion of the intermediate portion, which is more likely to rub against the portion. On the other hand, since the margin portion is flexibly formed in the front portion and the rear portion, the wearing feeling of the absorbent article can be improved.

It is preferable that the middle portion of the absorbent article is formed narrower than the front portion and the rear portion. When the absorbent article is formed in this way, when the absorbent article is attached, the narrowly formed middle portion is located between the wearer's thighs, and the wearer can easily move the legs. Become. Therefore, the thigh portion of the wearer is less likely to hit the margin portion of the intermediate portion strongly, and the absorbent material contained in the absorber is less likely to flow out from the intermediate portion of the absorbent article to the outside.

The absorber has both sides in the width direction and a central portion between them, and the amount of adhesive applied per unit area on both sides of the absorber is larger than the amount of adhesive applied per unit area in the central portion. Is preferable. By forming the absorber in this way, the central portion of the absorber is formed to have lower rigidity than both side portions, and the fit of the absorber in the urination portion of the wearer is enhanced. On the other hand, by increasing the amount of the adhesive applied to both sides of the absorber, the shape retention of the absorber is enhanced, and the absorber is less likely to be twisted or the edge of the absorber is less likely to be broken.

The amount of adhesive applied per unit area on both sides of the absorber is preferably larger in the intermediate portion than in the front portion and the rear portion. As a result, in the intermediate portion of the absorbent article, the integralness of the absorber and the skin surface side sheet and / or the non-skin surface side sheet is enhanced, and the absorbent material contained in the absorber is released from the intermediate portion of the absorbent article. It becomes difficult to leak to the outside.

The absorber has both sides in the width direction and a central portion between them, and is adhered to the skin surface side sheet, and the amount of adhesive applied per unit area on the skin surface side of both sides is the skin surface of the central portion. It may be larger than the amount of adhesive applied per unit area on the side. When the absorber is formed in this way, the permeability of urine from the skin surface side sheet to the absorber is increased in the central part of the absorber facing the urine part of the wearer, and the urine excreted by the wearer is increased. Etc. are quickly absorbed by the absorber.

The absorber has both sides in the width direction and a central portion between them, and is adhered to the skin surface side sheet, and the adhesive application density on the skin surface side on both sides is the adhesive on the skin surface side in the central portion. It may be higher than the density. Even if the absorber is formed in this way, the permeability of urine from the skin surface side sheet to the absorber can be enhanced in the central portion of the absorber facing the urination portion of the wearer.

The absorber has an absorbent core formed from an aggregate of hydrophilic fibers, and the absorbent core is preferably provided with an opening or a recess extending in the front-rear direction in the central portion. If the absorber is provided with an opening or a recess in this way, the urine absorbed in the central portion of the absorber can be easily diffused in the anteroposterior direction, and the absorption performance of the absorber can be further improved.

In the absorbent article of the present invention, the absorbent material contained in the absorber may flow out of the absorbent article from the middle portion in the front-rear direction, which is more likely to rub against the wearer's thigh when worn. It is difficult and the structure of the absorbent article is properly maintained. On the other hand, since the margin portion is flexibly formed in the front portion and the rear portion of the absorbent article, the wearing feeling of the absorbent article can be improved.

An example of the absorbent article of the present invention is shown, and a plan view of the absorbent article as viewed from the top sheet side is shown. It shows the BB sectional view of the absorbent article shown in FIG. The plan view of the absorber provided in the absorbent article shown in FIG. 1 is shown. The (a) AA cross-sectional view and (b) BB cross-sectional view of the absorbent article shown in FIG. 1 are shown, and the skin surface side sheet, the non-skin surface side sheet, and the adhesive to the absorber in each cross section are shown. A coating example is shown. The (a) AA cross-sectional view and (b) BB cross-sectional view of the absorbent article shown in FIG. 1 are shown, and the skin surface side sheet, the non-skin surface side sheet, and the adhesive to the absorber in each cross section are shown. A coating example is shown. The (a) AA cross-sectional view and (b) BB cross-sectional view of the absorbent article shown in FIG. 1 are shown, and the skin surface side sheet, the non-skin surface side sheet, and the adhesive to the absorber in each cross section are shown. A coating example is shown.

In the absorbent article of the present invention, an absorber is arranged between the skin surface side sheet and the non-skin surface side sheet. The absorbent article of the present invention can be applied to, for example, disposable diapers, urine pads (including incontinence pads), sanitary napkins and the like.

The absorbent article has a front-back direction and a width direction. The front-back direction means a direction extending in the front-back direction of the wearer's crotch when the wearer wears the absorbent article. The width direction means a direction that is on the same plane as the absorbent article and orthogonal to the front-rear direction, and corresponds to the left-right direction of the wearer when the absorbent article is worn. Further, the direction parallel to the plane formed from the front-rear direction and the width direction is the plane direction, and the vertical direction is the thickness direction. The absorbent article has a skin surface side and a non-skin surface side with respect to the thickness direction. The skin side means the side facing the wearer's skin when wearing the absorbent article, and the non-skin side means the side facing the wearer's side when wearing the absorbent article. means.

The shape of the absorbent article is not particularly limited. When the absorbent article is a urine pad or a sanitary napkin, the shape of the absorbent article is substantially rectangular, oval, hourglass, battledore or the like.

When the absorbent article is a disposable diaper, the disposable diaper is composed of, for example, an anterior abdomen and a posterior back and a crotch located between them and provided with an absorber. Disposable diapers are, for example, laminated with an absorber arranged between a skin-side sheet and a non-skin-side sheet on the crotch part of a pants member having an anterior abdomen, a back back part, and a crotch portion located between them. The body is provided and constructed. Disposable diapers are also formed in the shape of pants in which a laminate with an absorber arranged between the skin-side sheet and the non-skin-side sheet has an anterior abdomen and a back back and a crotch located between them. You may be. The anterior abdomen corresponds to a portion that is applied to the ventral side of the wearer when wearing a disposable diaper, and the back back portion corresponds to a portion that is applied to the back side of the wearer when wearing a disposable diaper. The crotch is located between the anterior abdomen and the back of the back, and corresponds to the portion of the crotch of the wearer.

Disposable diapers are tape-type (open type) disposable diapers in which fastening members are provided at the left and right ends of the back of the back, and the fastening members form a pants shape when worn, or the front abdomen and back of the diaper It may be a pants-type disposable diaper in which a waist opening and a pair of leg openings are formed by being joined.

The skin surface side sheet is a sheet located on the skin surface side of the absorber, and at least a part thereof is formed to be liquid permeable. Urine and the like excreted from the wearer pass through the skin surface side sheet and are stored in the absorber. The skin surface side sheet may be formed by connecting a plurality of sheet members in a plane direction, or may be a laminated body of a plurality of sheet members. The skin surface side sheet is composed of, for example, a liquid-permeable top sheet, or is formed by joining liquid-impermeable side sheets to both sides of the liquid-permeable top sheet in the width direction.

The non-skin surface side sheet is a sheet located on the non-skin surface side of the absorber, and is preferably liquid-impermeable. The liquid-impermeable non-skin surface side sheet can prevent urine and the like absorbed by the absorber from leaking to the outside. The non-skin surface side sheet may be formed by connecting a plurality of sheet members in a plane direction, or may be a laminated body of a plurality of sheet members. The non-skin-side sheet is composed of, for example, a liquid-impermeable back sheet.

Examples of the liquid-permeable sheet member constituting the skin-side sheet and the non-skin-side sheet include non-woven fabrics formed of hydrophilic fibers such as cellulose, rayon, and cotton; and polyolefins (for example, polypropylene and polyethylene). A non-woven fabric formed of hydrophobic fibers such as polyester (for example, PET) and polyamide (for example, nylon), in which the surface of the hydrophobic fibers is hydrophilized by a surfactant, or the like can be used. Further, as the liquid permeable sheet member, a woven cloth, a knitted cloth, a perforated plastic film or the like may be used.

The liquid-impermeable sheet member constituting the skin-side sheet or non-skin-side sheet includes hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), and polyamide (for example, nylon). A non-woven fabric formed from, a plastic film, or the like can be used. Further, as the liquid-impermeable sheet member, a laminate of a non-woven fabric and a plastic film may be used.

When a non-woven fabric is used as a liquid-permeable or liquid-impermeable sheet member, it is preferable to use a spunbonded non-woven fabric, a point-bonded non-woven fabric, an air-through non-woven fabric, a melt-blown non-woven fabric, an air-laid non-woven fabric, a spunlaced non-woven fabric, an SMS non-woven fabric, or the like. ..

The absorber is not particularly limited as long as it contains an absorbent material capable of absorbing excrement such as urine. As the absorbent body, for example, a molded body obtained by molding an absorbent material into a predetermined shape is provided as an absorbent core, or the absorbent core is coated with a paper sheet (for example, tissue paper or thin paper) or a liquid-permeable non-woven fabric sheet. It may be covered with a sheet. Examples of the absorbent material include hydrophilic fibers such as pulp fibers and water-absorbent resins such as polyacrylic acid-based, polyaspartic acid-based, cellulosic-based, and starch / acrylonitrile-based. Further, the water-absorbent material may include polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and heat-sealing fibers such as polyamide fibers. These heat-sealing fibers may be hydrophilized with a surfactant or the like in order to enhance the affinity with urine or the like.

The absorbent material preferably contains hydrophilic fibers from the viewpoint of increasing the absorption rate of urine and the like. Therefore, the absorber preferably has an absorbent core formed from an aggregate of hydrophilic fibers (particularly pulp fibers). Further, from the viewpoint of increasing the absorption capacity, the absorbent material preferably contains a water-absorbent resin, and therefore, the absorbent core is more preferably formed from an aggregate of hydrophilic fibers containing the water-absorbent resin. In this case, for example, it is preferable to use an aggregate of hydrophilic fibers mixed or sprayed with a water-absorbent resin.

The absorber may be a sheet-shaped absorber. Examples of the sheet-shaped absorber include those formed so as to have a water-absorbent resin between the non-woven fabrics and not to have pulp fibers. Since the sheet-shaped absorber formed in this way has a water-absorbent resin between the non-woven fabrics, a high absorption capacity can be realized. Further, since the sheet-shaped absorber does not have pulp fibers between the non-woven fabrics, it can be formed thin without being bulky.

Water-absorbent fibers may be used as the absorbent material. In this case as well, the sheet-like absorber is formed thin without being bulky. Examples of the water-absorbent fiber include fibers containing a protonated or salt-formed carboxyl group. For example, a water-absorbent fiber can be obtained by hydrolyzing an acrylic fiber to convert a nitrile group contained in the acrylic fiber into a carboxyl group. At this time, it is preferable that the carboxyl group contained in the water-absorbent fiber forms an alkali metal salt or an ammonia salt. Further, the water-absorbent fiber can be produced by immersing the hydrophilic fiber in acrylic acid and precipitating acrylic acid on the fiber surface.

In the absorbent article, two or more absorbers may be arranged between the skin-side sheet and the non-skin-side sheet. For example, a plurality of absorbers having an absorbent core formed from an aggregate of hydrophilic fibers may be arranged in a stack. Further, an absorber having an absorbent core formed from an aggregate of hydrophilic fibers and a sheet-shaped absorber may be arranged in an overlapping manner.

The shape (planar shape) of the absorber is not particularly limited. The shape of the absorber may be appropriately determined according to the intended use, and examples thereof include a substantially rectangular shape, an hourglass shape, and a battledore shape.

It is preferable that a pair of rising flaps are provided on both sides in the width direction on the skin surface side of the absorbent article. The rising flap prevents lateral leakage of urine and the like. The rising flap is preferably provided with an upright elastic member extending in the front-rear direction, and the standing flap can be formed so as to stand up toward the wearer's skin by the contraction force of the standing elastic member.

The rising flap can be formed from the side sheets that form a part of the skin surface side sheet described above. Specifically, liquid-impermeable side sheets are provided on both sides of the liquid-permeable top sheet in the width direction, the side sheets are joined to the skin surface side of the top sheet at the side joints, and the side joints of the side sheets are joined. The inner portion in the width direction can be formed as a rising flap.

The absorber is formed to be narrower than the skin surface side sheet and the non-skin surface side sheet, and margin portions in the width direction of the absorbent article are formed in the absence of the absorber. The skin-side sheet and the non-skin-side sheet are adhered to each other at the margin portion, and the margin portion prevents the absorbent material contained in the absorbent body from flowing out to the outside of the absorbent article. It is preferable that the absorbent article has margin portions having no absorber at both ends in the longitudinal direction.

The absorbent article has a front portion, a rear portion, and an intermediate portion between them in the front-rear direction, and the peel strength between the skin surface side sheet and the non-skin surface side sheet in the margin portion is higher than that in the front portion and the rear portion. The middle part is higher. Since the absorbent article is positioned so that the middle part in the front-rear direction is sandwiched between the wearer's thighs when worn, when the wearer moves the leg while wearing the absorbent article, the margin part is in the middle. It becomes easy to rub strongly against the wearer's thigh in the part. Therefore, since the peel strength of the margin portion is formed higher in the intermediate portion, the absorbent material contained in the absorber is less likely to flow out to the outside of the absorbent article. On the other hand, in the absorbent article, the peel strength of the margin portion is formed to be relatively low in the front portion and the rear portion, so that the margin portion is flexibly formed in the front portion and the rear portion, and the wearing feeling of the absorbent article is improved. It can be good.

The absorbent article may be formed so that the amount of adhesive applied per unit area of the margin portion is larger in the intermediate portion than in the front portion and the rear portion. Alternatively, the absorbent article may be formed so that the adhesive coating density of the margin portion is higher in the intermediate portion than in the front portion and the rear portion. Even if the margin portion is formed in this way, the absorbent material contained in the absorber is less likely to flow out to the outside of the absorbent article, and the margin portion is flexibly formed in the front portion and the rear portion. The wearing feeling of the absorbent article can be improved. In the margin portion, the adhesive may be applied only to the skin surface side sheet, may be applied only to the non-skin surface side sheet, or may be applied to both of them.

The peel strength of the margin portion is measured according to JIS K 6854-2 "Adhesive-Peeling Adhesive Strength Test Method (180 Degree Peeling)". The size of the test piece used for the measurement is not particularly limited as long as the front margin portion, the middle margin portion, and the rear margin portion are cut out to have the same size. The test piece may be used, for example, by cutting out a margin portion to a size of 100 mm × 10 mm.

The amount of adhesive applied to the margin portion is determined by cutting out the front margin portion, the intermediate portion margin portion, and the rear portion margin portion, respectively, and peeling off the skin surface side sheet and the non-skin surface side sheet of each cutout piece. It can be obtained by immersing each peeled sheet in a solvent to dissolve the adhesive, and measuring the weight of the residue from which the solvent is distilled off. Alternatively, the amount of adhesive applied can be obtained from the amount of adhesive used during manufacturing. By dividing the adhesive coating amount thus obtained by the area of the cut-out piece, the adhesive coating amount per unit area of the margin portion can be obtained.

The adhesive coating density of the margin portion can be obtained by dividing the adhesive coating area of the margin portion by the area of the margin portion. For the adhesive application area in the margin portion, the front margin portion, the intermediate portion margin portion, and the rear portion margin portion are cut out, and the skin surface side sheet and the non-skin surface side sheet of each cut piece are peeled off. It can be obtained by spraying toner (carbon powder) on each peeled sheet and measuring the area of the portion where the toner adheres and is visualized as black. The area of the portion visualized in black can be obtained, for example, by taking a digital image and performing image processing.

The peeling strength of the margin portion, the adhesive coating amount per unit area, and the adhesive coating density described above are located at the margin portions at both ends in the width direction of the absorbent article, that is, outside the width direction of the absorber. For the margin portion to be formed, the values in the front portion, the middle portion, and the rear portion are obtained. For the adhesive application amount, the total of the adhesive application amount of the skin surface side sheet and the adhesive application amount of the non-skin surface side sheet is obtained. For the adhesive coating density, the adhesive coating density in a state where the skin surface side sheet and the non-skin surface side sheet are overlapped is determined.

The application pattern of the adhesive in the margin portion is not particularly limited. The adhesive may be applied to substantially the entire surface of the margin portion, or the adhesive may be applied in a predetermined pattern. As a method of applying the adhesive, for example, a bead method, a curtain spray method, an omega coating method, a spiral coating method, a pattern coating or the like can be used. Among them, the adhesive is preferably provided in a linear shape extending in the front-rear direction, whereby the margin portion is sealed with the linearly provided adhesive, and the absorbent material contained in the absorber is a margin. It is effectively prevented from flowing out from the part. In addition, it is possible to suppress the stiffness of the absorbent article.

It is also preferable that the adhesive is applied in a plurality of application patterns in the margin portion of the intermediate portion. As a result, the absorbent material contained in the absorber is less likely to flow out from the margin portion in the intermediate portion. For example, in the margin portion of the intermediate portion, it is preferable that the adhesive is provided in a linear pattern extending in the front-rear direction and is provided in a curved pattern (for example, a spiral pattern or an omega pattern). On the other hand, it is preferable that the adhesive is applied to the front and rear margin portions in a single coating pattern (for example, a linear pattern extending in the front-rear direction).

It is convenient in manufacturing to use a hot melt adhesive as the adhesive. The adhesives include, for example, rubber-based adhesives such as natural rubber-based, butyl rubber-based, and polyisoprene; styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and styrene. It is preferable to include a styrene-based elastomer such as -ethylene-butadiene-styrene block copolymer (SEBS) and styrene-ethylene-propylene-styrene block copolymer (SEPS) as the base polymer. Further, as the base polymer, ethylene-vinyl acetate copolymer (EVA); polyester; acrylic elastomer; polyolefin-based elastomer or the like may be used. The adhesive may contain a tackifier, a softener, a wax, a stabilizer and the like.

The length of the front part, the middle part, and the rear part of the absorbent article in the front-rear direction is not particularly limited. For example, when the front end is 0% and the rear end is 100% as the relative position of the absorbent article in the front-rear direction, the middle portion is preferably in the range of 10% to 90%, preferably 15% to 80%. It is more preferably within the range, and even more preferably within the range of 20% to 70%. The intermediate portion may be formed within a narrower range in the front-rear direction.

It is preferable that the middle portion of the absorbent article is formed narrower than the front portion and the rear portion. Examples of such absorbent articles include urine pads formed in a substantially hourglass shape, tape-type disposable diapers having notches for opening legs on both sides in the width direction, and pants-type disposable diapers. Can be mentioned. When the absorbent article is formed in this way, the narrowly formed intermediate portion is located between the wearer's thighs during wearing, and the wearer can easily move the legs. As a result, the thigh portion of the wearer is less likely to hit the margin portion of the intermediate portion strongly, and the absorbent material contained in the absorbent body is less likely to flow out from the margin portion of the intermediate portion of the absorbent article.

When the absorbent article is formed with the intermediate portion narrower than the front portion and the rear portion, the front portion, the intermediate portion and the rear portion may be classified as follows, for example. That is, the length in the width direction of the widest part of the front portion and W _F, the width direction of the widest part of the rear portion of the length and W _R, in the width direction of the narrowest portion of the intermediate portion when the length was W _M, the boundary of the front portion and the intermediate portion is a portion where the length in the width direction becomes _{(W F + W M) /} 2, the boundary of the rear portion and the intermediate portion has a length in the width direction _{(W R + W M) /} 2 and may be a portion which becomes.

The absorber is preferably adhered to the skin-side sheet and / or the non-skin-side sheet. Thereby, the integrity of the absorber and the skin surface side sheet and / or the non-skin surface side sheet can be enhanced. In this case, when the absorber is divided into both side portions and the central portion between them in the width direction, the amount of adhesive applied per unit area on both side portions of the absorber is per unit area in the central portion. It is preferable that the amount is larger than the adhesive application amount. By forming the absorber in this way, the central portion of the absorber is formed to have lower rigidity than both side portions, and the fit of the absorber in the urination portion of the wearer is enhanced. On the other hand, by increasing the amount of the adhesive applied to both sides of the absorber, the shape retention of the absorber is enhanced, and the absorber is less likely to be twisted or the edge of the absorber is less likely to be broken. The amount of the adhesive applied to the absorber described here is the adhesive that adheres the absorber to the skin surface side sheet and / or the non-skin surface side sheet (that is, the skin surface side and / or non-skin of the absorber). It means the amount of the adhesive present on the surface side), and may be the adhesive applied to the absorber during the production of the absorbent article, and is applied to the skin surface side sheet or the non-skin surface side sheet. It may be an adhesive that has been applied.

The central portion of the absorber is defined as a portion including the center line in the width direction (center line extending in the front-rear direction) of the absorber. The length in the width direction of both side portions and the central portion of the absorber is not particularly limited, but the length in the width direction of the central portion of the absorber is preferably, for example, 3 cm or more, more preferably 5 cm or more, and preferably 20 cm or less. , 15 cm or less is more preferable, and 10 cm or less is further preferable. In the absorbent article, the central portion and both side portions (that is, the central portion with a small amount of adhesive applied and the both sides with a large amount of adhesive applied) are formed in each of the front portion, the intermediate portion, and the rear portion. It is preferable, but it is not necessary to form both side portions having a large amount of adhesive applied to a part of the absorber in the front-rear direction. For example, when the intermediate portion of the absorber is formed to be narrow, it is not necessary to form both side portions having a large amount of adhesive applied to the narrowest portion of the absorber.

When more adhesive is applied to both sides of the absorber as described above, the amount of adhesive applied per unit area on both sides of the absorber is formed more in the middle portion than in the front portion and the rear portion. It may have been done. As a result, in the intermediate portion of the absorbent article, the integralness of the absorber and the skin surface side sheet and / or the non-skin surface side sheet is enhanced, and the absorbent material contained in the absorber is released from the intermediate portion of the absorbent article. It becomes difficult to leak to the outside.

The absorber is adhered to, for example, the skin surface side sheet, and the amount of adhesive applied per unit area on both sides of the absorber is larger than the amount of adhesive applied per unit area on the skin surface side of the central portion. It is preferable that it is formed so as to increase the amount. When the absorber is formed in this way, the permeability of urine from the skin surface side sheet to the absorber is increased in the central part of the absorber facing the urine part of the wearer, and the urine excreted by the wearer is increased. Etc. are quickly absorbed by the absorber.

It is also preferable that the absorber is adhered to the skin surface side sheet, and the adhesive coating density on the skin surface side on both sides of the absorber is formed higher than the adhesive density on the skin surface side in the central portion of the absorber. .. Even if the absorber is formed in this way, the permeability of urine from the skin surface side sheet to the absorber can be enhanced in the central portion of the absorber facing the urination portion of the wearer.

The absorber is adhered to the non-skin surface side sheet, and the amount of adhesive applied per unit area on both sides of the absorber on the non-skin surface side is the amount of adhesive applied per unit area on the non-skin surface side of the central part. May be formed more than. The absorber is also adhered to the non-skin surface sheet, and the non-skin surface side adhesive density on both sides of the absorber is formed higher than the non-skin surface side adhesive density in the center of the absorber. May be. When the absorber is formed in this way, the central portion of the absorber is formed to have lower rigidity than both side portions, and it becomes easy to improve the fit of the absorber in the urination portion of the wearer.

The application pattern of the adhesive on the absorber is not particularly limited. At each part of the absorber, the adhesive may be applied over substantially the entire surface, or the adhesive may be applied in a predetermined pattern. As a method of applying the adhesive, for example, a bead method, a curtain spray method, an omega coating method, a spiral coating method, a pattern coating or the like can be used. As the adhesive, it is preferable to use a hot melt adhesive.

If the amount of adhesive applied to the central part of the absorber is small as described above, or if the adhesive application density to the central part of the absorber is low, the fit of the absorber in the urinary part of the wearer The urine excreted by the wearer is absorbed particularly quickly into the central part of the absorber by increasing the sexuality or by increasing the permeability of urine from the skin surface sheet to the absorber in the central part of the absorber. It becomes easy to be done. Therefore, in order to increase the diffusivity of urine in the central portion of the absorber, it is preferable that the central portion of the absorber is provided with an opening or a recess extending in the anteroposterior direction. Specifically, the absorber preferably has an absorbent core formed from an aggregate of hydrophilic fibers, and the absorbent core is preferably provided with an opening or a recess extending in the front-rear direction in the central portion. If the absorber is provided with an opening or a recess in this way, the urine absorbed in the central portion of the absorber can be easily diffused in the anteroposterior direction, and the absorption performance of the absorber can be further improved.

The opening is provided through the absorbent core in the thickness direction. The recesses are formed, for example, by partially compressing the absorbent core or by partially reducing the basis weight of the absorbent core. In this case, the compressed portion of the absorbent core and the portion with the reduced basis weight are formed as recesses. The concave portion of the absorbent core is preferably formed by partially reducing the basis weight of the absorbent core, which makes it easy to form the absorbent core in a recessed shape. In this case, the concave portion is preferably formed so that the basis weight is 60% by mass or less (more preferably 50% by mass or less, still more preferably 40% by mass or less) than the portion other than the concave portion. .. The recesses may be formed on the skin surface side of the absorbent core or on the non-skin surface side, but preferably the recesses are formed on the skin surface side of the absorbent core.

When the absorbent core is composed of an upper absorbing layer and a lower absorbing layer, the recess of the absorbing core is formed by forming an opening in the upper absorbing layer and providing the lower absorbing layer so as to cover the opening. It may be formed. Even in this way, the recess can be formed on the skin surface side of the absorbent core.

It is preferable that only one opening or recess is provided in the absorbent core. The width direction of the opening or recess is preferably 5% or more, more preferably 8% or more, still more preferably 10% or more of the width direction of the narrowest portion of the absorbent core. Further, 30% or less is preferable, 25% or less is more preferable, and 20% or less is further preferable. The width of the opening or recess is also preferably 5 mm or more, more preferably 8 mm or more, preferably 45 mm or less, and more preferably 35 mm or less. The opening or recess is preferably provided only in the central portion of the absorber.

The length of the opening or recess in the front-rear direction is preferably 20% or more, more preferably 30% or more, more preferably 70% or less, and more preferably 60% or less of the length in the front-rear direction of the absorbent core. It is preferable, and more preferably 50% or less. The openings or recesses are preferably provided so as not to contact the outer edge of the absorbent core, which enhances the shape retention of the absorbent core.

When the absorbent core is formed in an hourglass shape, i.e., when the absorbent core is formed with the middle portion narrower than the front and rear portions, the opening or recess is preferably provided at least in the middle portion. It is more preferable that the portion is provided so as to extend in the front-rear direction across the narrowest portion of the portion.

The absorber is preferably configured with an absorbent core covered with a coating sheet. The coating sheet may cover at least a part of the absorber. By constructing the absorber in this way, the outflow of the absorbent material from the absorber is less likely to occur. If openings or recesses are formed in the absorbent core as described above, the openings or recesses may be covered with a coating sheet.

Next, the absorbent article of the present invention will be described with reference to the drawings, taking a urine pad as an example. The present invention is not limited to the embodiments shown in the drawings.

FIG. 1 shows a plan view of a urine pad as seen from the skin surface side as an example of the absorbent article of the present invention. FIG. 2 shows a cross-sectional view taken along the line BB of the absorbent article shown in FIG. In the drawings, the arrow x represents the width direction, the arrow y represents the front-back direction, and the arrow z represents the thickness direction. In FIG. 1, the upper side of the drawing corresponds to the front side of the absorbent article, and the lower side of the drawing corresponds to the rear side of the absorbent article.

The absorbent article 1 has a skin surface side sheet 2, a non-skin surface side sheet 6, and an absorber 7 arranged between them. The skin surface side sheet 2 is configured by providing liquid impermeable side sheets 4 on both sides of the liquid permeable top sheet 3 in the width direction x, and the side sheet 4 is side-joined to the skin surface side of the top sheet 3. It is joined at part 5. The urine or the like excreted from the wearer passes through the top sheet 3 and is stored in the absorber 7. The non-skin surface side sheet 6 prevents excrement from leaking to the outside.

The side sheet 4 is provided with an elastic member 8 extending in the front-rear direction y in an inner portion in the width direction x with respect to the side joint portion 5. Due to the contraction force of the elastic member 8, the inner portion of the side sheet 4 in the width direction x rises toward the wearer's skin, and a rising flap is formed. The rising flap formed on the inner portion of the side sheet 4 prevents lateral leakage of urine and the like.

The absorbent article 1 has a front portion F, a rear portion R, and an intermediate portion M between them in the front-rear direction y, and margin portions 9 in which the absorber 7 does not exist are formed at both ends in the width direction x. .. In the absorbent article 1 shown in the drawing, the intermediate portion M is formed narrower than the front portion F and the rear portion R, and is formed in a substantially hourglass shape.

The skin surface side sheet 2 and the non-skin surface side sheet 6 are adhered to each other at the margin portion 9, and the peel strength of the skin surface side sheet 2 and the non-skin surface side sheet 6 at the margin portion 9 is higher than that of the front portion F and the rear portion R. The middle part M is higher. Alternatively, the amount of adhesive applied per unit area in the margin portion 9 is larger in the intermediate portion M than in the front portion F and the rear portion R, or the adhesive coating density in the margin portion 9 is higher in the front portion and the rear portion. The middle part may be higher than the part. In the absorbent article 1, the margin portion 9 is formed in this way, so that the absorbent material contained in the absorbent body 7 is less likely to flow out to the outside of the absorbent article 1, and the front portion F and the rear portion F and the rear portion F are less likely to flow out. The margin portion 9 is flexibly formed in the portion R, and the wearing feeling of the absorbent article 1 can be improved.

FIG. 3 shows a plan view of the absorber 7 provided in the absorbent article 1 shown in FIG. As shown in FIG. 3, the absorber 7 can be divided into a front portion F, a rear portion R, and an intermediate portion M between them in the front-rear direction y, and between both side portions S and these in the width direction x. It can be divided into a central portion C. In FIG. 3, the boundary for dividing each part is indicated by a long-dotted chain line.

In the absorber 7, it is preferable that the amount of adhesive applied per unit area on both side portions S in the width direction x is larger than the amount of adhesive applied per unit area in the central portion C in the width direction x. As a result, the central portion C of the absorber 7 is formed to have lower rigidity than the both side portions S, and the fit of the absorber 7 in the urination portion of the wearer is enhanced. On the other hand, by increasing the amount of adhesive applied to both side portions S of the absorber 7, the shape retention of the absorber 7 is enhanced, and the absorber 7 is less likely to be twisted or the end of the absorber 7 is less likely to be broken. Become.

It is also preferable that the amount of the adhesive applied per unit area on both side portions S of the absorber 7 is larger in the intermediate portion M than in the front portion F and the rear portion R. As a result, in the intermediate portion M, the integrity of the absorbent body 7 and the skin surface side sheet 2 and / or the non-skin surface side sheet 6 is enhanced, and the absorbent material contained in the absorbent body 7 is external from the absorbent article 1. It becomes difficult to leak to.

The absorber 7 is configured such that the absorbent core is covered with a coating sheet, and the absorbent core is provided with an opening 10 extending in the front-rear direction y in the central portion C. By providing the opening 10 in the absorber 7 in this way, urine is likely to diffuse in the anteroposterior direction y in the absorber 7, and the absorption performance of the absorber 7 can be enhanced.

The length of the central portion C of the absorber 7 in the width direction x is one of the width directions x when the skin surface side sheet 2 is composed of the top sheet 3 and the side sheet 4 as shown in FIGS. 1 and 2. It is preferably 75% or more, more preferably 85% or more, and even more preferably 90% or more of the length between the side joints 5 on the side and the other side. When the absorber 7 is formed in this way, the urine that has permeated the top sheet 3 is easily absorbed by the central portion C of the absorber 7 in which the amount of the adhesive applied is small.

4 to 6 show an example of applying an adhesive for forming a margin portion and an example of applying an adhesive for adhering the absorber to the skin surface side sheet and / non-skin surface side sheet. 4 to 6 show a cross-sectional view taken along the line AA and a cross-sectional view taken along the line BB of the absorbent article shown in FIG. 1, with FIGS. 4 (a), 5 (a), and 6 (a). AA cross-sectional view is shown, and a cross-sectional view in the middle portion of the absorbent article is shown. FIGS. 4 (b), 5 (b), and 6 (b) show a BB cross-sectional view, which is absorbent. Represents a cross-sectional view of the rear portion of the article.

In FIG. 4, the adhesive 11 is applied to the skin surface side sheet 2, whereby the skin surface side sheet 2 and the non-skin surface side sheet 6 are adhered to each other at the margin portions 9 of the front portion F and the rear portion R ( See FIG. 4 (b)). Further, in FIG. 4, the adhesive 12 is further applied to the skin surface side sheet 2, and in the margin portion 9 of the intermediate portion M, the skin surface side sheet 2 and the non-skin surface side sheet 6 are formed by the adhesive 11 and the adhesive 12. It is glued (see FIG. 4 (a)). By applying the adhesive 11 and the adhesive 12 in this way, the skin surface side sheet 2 and the non-skin surface side sheet 6 can be more firmly adhered to each other at the margin portion 9 of the intermediate portion M.

In FIG. 4, both side portions S on the skin surface side of the absorber 7 are joined to the skin surface side sheet 2 by the adhesive 11 and the adhesive 12, and the central portion C on the skin surface side of the absorber 7 is skinned by the adhesive 12. It is joined to the surface side sheet 2. By applying the adhesive 11 and the adhesive 12 to the absorber 7 in this way, the amount of the adhesive applied per unit area of the absorber 7 is smaller in the central portion C than in the side portions S. ..

In FIG. 5, the adhesive 13 is applied to the non-skin surface side sheet 6, whereby the skin surface side sheet 2 and the non-skin surface side sheet 6 are adhered to each other at the margin portions 9 of the front portion F and the rear portion R. (See FIG. 5 (b)). Further, in FIG. 5, the adhesive 14 is further applied to the skin surface side sheet 2, and in the margin portion 9 of the intermediate portion M, the skin surface side sheet 2 and the non-skin surface side sheet 6 are formed by the adhesive 13 and the adhesive 14. It is glued (see FIG. 5 (a)). By applying the adhesive 13 and the adhesive 14 in this way, the skin surface side sheet 2 and the non-skin surface side sheet 6 can be more firmly adhered to each other at the margin portion 9 of the intermediate portion M.

In FIG. 5, both side portions S on the skin surface side of the absorber 7 are joined to the skin surface side sheet 2 by the adhesive 14, and both side portions S on the non-skin surface side of the absorber 7 are non-skin surface side by the adhesive 13. It is joined to the sheet 6. Further, the adhesive 14 is used to bond the central portion C of the absorber 7 on the skin surface side to the skin surface side sheet 2. By applying the adhesive 13 and the adhesive 14 to the absorber 7 in this way, the amount of the adhesive applied per unit area of the absorber 7 is smaller in the central portion C than in the side portions S. ..

In FIG. 6, the adhesive 15 is applied to the non-skin surface side sheet 6, whereby the skin surface side sheet 2 and the non-skin surface side sheet 6 are adhered to each other at the margin portions 9 of the front portion F and the rear portion R. (See FIG. 6 (b)). Further, in FIG. 6, the adhesive 16 is further applied to the non-skin surface side sheet 6, and in the margin portion 9 of the intermediate portion M, the skin surface side sheet 2 and the non-skin surface side sheet 6 are formed by the adhesive 15 and the adhesive 16. Are glued together (see FIG. 6A). By applying the adhesive 15 and the adhesive 16 in this way, the skin surface side sheet 2 and the non-skin surface side sheet 6 can be more firmly adhered to each other at the margin portion 9 of the intermediate portion M.

In FIG. 6, both side portions S on the non-skin surface side of the absorber 7 are joined to the non-skin surface side sheet 6 by the adhesive 15 and the adhesive 16, and both side portions S on the skin surface side of the absorber 7 are the adhesive 17 It is joined to the skin surface side sheet 2 by. The adhesive 17 is also applied to the central portion C of the absorber 7 on the skin surface side, and the central portion C of the absorber 7 on the skin surface side is bonded to the skin surface side sheet 2 by the adhesive 17. By applying the adhesive 15, the adhesive 16, and the adhesive 17 to the absorber 7 in this way, the amount of the adhesive applied per unit area of the absorber 7 is higher in the central portion C than in the side portions S. It is decreasing.

1: Absorbent article 2: Skin surface side sheet 3: Top sheet 4: Side sheet 5: Side joint 6: Non-skin surface side sheet 7: Absorbent 8: Elastic member 9: Margin part 10: Opening 11 to 17: adhesive

Claims (9)

An absorbent article in which an absorber is arranged between the skin-side sheet and the non-skin-side sheet.
The absorbent article has a front portion, a rear portion, and an intermediate portion between them in the front-rear direction, and margin portions in which the absorber does not exist are formed at both ends in the width direction.
The skin surface side sheet and the non-skin surface side sheet are adhered to each other at the margin portion, and the peel strength between the skin surface side sheet and the non-skin surface side sheet at the margin portion is higher than that of the front portion and the rear portion. Also, an absorbent article characterized in that the middle portion is higher. An absorbent article in which an absorber is arranged between the skin-side sheet and the non-skin-side sheet.
The absorbent article has a front portion, a rear portion, and an intermediate portion between them in the front-rear direction, and margin portions in which the absorber does not exist are formed at both ends in the width direction.
The skin surface side sheet and the non-skin surface side sheet are adhered to each other at the margin portion, and the amount of adhesive applied per unit area of the margin portion is higher in the intermediate portion than in the front portion and the rear portion. Absorbent article characterized by a large amount. An absorbent article in which an absorber is arranged between the skin-side sheet and the non-skin-side sheet.
The absorbent article has a front portion, a rear portion, and an intermediate portion between them in the front-rear direction, and margin portions in which the absorber does not exist are formed at both ends in the width direction.
The skin surface side sheet and the non-skin surface side sheet are adhered to each other at the margin portion, and the adhesive application density of the margin portion is higher in the intermediate portion than in the front portion and the rear portion. Absorbent article. The absorbent article according to any one of claims 1 to 3, wherein the intermediate portion is formed narrower than the front portion and the rear portion. The absorber has both sides in the width direction and a central portion between them.
The absorbent article according to any one of claims 1 to 4, wherein the amount of adhesive applied per unit area on both sides of the absorber is larger than the amount of adhesive applied per unit area on the central portion. The absorbent article according to claim 5, wherein the amount of the adhesive applied per unit area on both side portions of the absorber is larger in the intermediate portion than in the front portion and the rear portion. The absorber has both sides in the width direction and a central portion between them, and is adhered to the skin side sheet.
The invention according to any one of claims 1 to 6, wherein the amount of adhesive applied per unit area on the skin surface side of both sides is larger than the amount of adhesive applied per unit area on the skin surface side of the central portion. Absorbent article. The absorber has both sides in the width direction and a central portion between them, and is adhered to the skin side sheet.
The absorbent article according to any one of claims 1 to 7, wherein the adhesive coating density on the skin surface side of both side portions is higher than the adhesive density on the skin surface side of the central portion. The absorber has an absorbent core formed from an aggregate of hydrophilic fibers.
The absorbent article according to any one of claims 5 to 8, wherein the absorbent core is provided with an opening or a recess extending in the front-rear direction in the central portion.

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