JP7118116B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to absorbent articles such as absorbent pads, disposable diapers, and sanitary napkins, and more particularly to technology for improving the absorbent performance of absorbent articles.

Absorbent articles such as incontinence pads, disposable diapers, and sanitary napkins have absorbent bodies that absorb and retain bodily fluids such as urine and menstrual blood excreted from the body. The absorber generally contains water-absorbing resin powder, and body fluids and the like are absorbed and retained by the water-absorbing resin powder inside the absorber. In such water-absorbent articles, an absorber having a multi-layer structure has been proposed.

For example, Patent Document 1 discloses an absorbent article comprising a topsheet, a backsheet and an absorbent body, wherein the absorbent body has a fiber assembly and an adjacent member, and the fiber assembly includes fibers and a large number of particulates. and a large number of particulate water-absorbent polymers are unevenly distributed on the non-skin-contacting side of the fiber assembly before the fiber assembly absorbs liquid, An absorbent article characterized in that after the fiber assembly absorbs liquid, at least a part thereof is detached from the fiber assembly and is interposed between the fiber assembly and the adjacent member. (See Patent Document 1 (claim 1)).

Patent Document 2 discloses an absorbent article comprising a topsheet, a backsheet, and an absorbent body, wherein the absorbent body is divided into a widthwise central portion and widthwise side portions in the widthwise direction, and the lengthwise direction The absorbent body is divided into an intermediate portion and both longitudinal end portions, and has a central absorbent core upper layer on the surface sheet side of the longitudinal intermediate portion and both longitudinal end portions in the width direction central portion, and 2) ) Both sides in the width direction have absorbent core layers on the surface sheet side of the longitudinal middle part and both longitudinal ends, 3) At least the width of the width direction middle part of the longitudinal middle part and both longitudinal ends A low-density skeletal layer containing crimped hydrophilic fibers and a water-absorbent material is provided in the direction center and the low-density skeletal layer, and the low-density skeletal layer has a density lower than that of each of the central absorbent core upper layer and the side absorbent core layers. said low density skeletal layer having a thickness greater than the thickness of each of said side absorbent core layers at least in a longitudinally intermediate portion; An absorbent article having a basis weight smaller than the basis weight is described (see Patent Document 2 (claim 1)).

JP-A-2009-22328 JP 2017-221643 A

An object of the present invention is to provide an absorbent article having excellent absorption performance.

The absorbent article of the present invention has a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet. The absorbent body is composed of an upper absorbent body, a lower absorbent body arranged on the back sheet side of the upper absorbent body, and a covering sheet surrounding the upper absorbent body and the lower absorbent body. The upper absorbent body is formed of acetate fibers, the lower absorbent body contains water absorbent resin powder and pulp, and the upper absorbent body is wider than the lower absorbent body over the entire front-rear direction of the absorbent body. It is characterized by being widely formed.

In the absorbent article of the present invention, the width of the upper absorbent body is wider than that of the lower absorbent body over the entire front-rear direction of the absorbent body. It fits around the crotch and prevents leakage of urine and the like. In addition, since the upper layer absorbent body is made of acetate fibers, the diffusion of urine and the like inside the upper layer absorbent body is accelerated. Furthermore, since the lower absorbent core contains pulp, urine and the like diffused in the upper absorbent core tend to migrate to the lower absorbent core. Therefore, the absorption rate of urine etc. of the absorbent article is increased.

ADVANTAGE OF THE INVENTION According to this invention, the absorbent article excellent in absorption performance is obtained.

The top view which shows an example of the absorber used by this invention. FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. 1; The top view which shows an example of the absorbent article of this invention. FIG. 4 is a schematic cross-sectional view taken along line BB of FIG. 3; FIG. 4 is a plan view showing another example of the absorbent article of the present invention; FIG. 6 is a schematic cross-sectional view taken along line CC of FIG. 5;

The absorbent article of the present invention has a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet. The top sheet is arranged on the skin surface side of the absorbent core, and the back sheet is arranged on the non-skin surface side (outer surface side) of the absorbent core. Excrement that permeates the top sheet is accommodated by the absorbent body. The backsheet prevents excrement from leaking out.

The absorbent article has a front-back direction y and a width direction x. The front-rear direction y corresponds to the direction extending in the front-rear direction between the wearer's crotch when the absorbent article is worn. The width direction x means a direction that is on the same plane as the absorbent article and perpendicular to the front-rear direction y, and corresponds to the lateral direction of the wearer when wearing the absorbent article. A direction perpendicular to a plane defined by the width direction x and the front-rear direction y is the thickness direction z. When the absorbent article is worn by the wearer, the side facing the skin of the wearer is defined as the skin surface side, and the opposite side is defined as the outer surface side.

1. Absorbent Figures 1 and 2 show an example of the absorbent used in the absorbent article of the present invention. The absorber 10 absorbs and retains body fluids such as urine. The absorbent body 10 is composed of an upper absorbent body 11, a lower absorbent body 12 arranged on the outer surface side of the upper absorbent body 11, and a cover sheet 13 surrounding the upper absorbent body 11 and the lower absorbent body 12. The upper layer absorbent body 11 is made of acetate fibers, and the lower layer absorbent body 12 contains water absorbent resin powder and pulp. Further, the width W1 of the upper layer absorbent body 11 is wider than the width W2 of the lower layer absorbent body 12 over the entire length of the absorbent body 10 in the front-rear direction.

In the absorbent article of the present invention, since the upper absorbent body is formed wider than the lower absorbent body over the entire front-rear direction of the absorbent body, the upper absorbent body tends to be bowl-shaped along the crotch. Therefore, the upper layer absorbent body fits the crotch portion, and leakage of urine and the like can be prevented. In addition, since the upper layer absorbent body is made of acetate fibers, the diffusion of urine and the like inside the upper layer absorbent body is accelerated. Furthermore, since the lower absorbent core contains pulp, urine and the like diffused in the upper absorbent core tend to migrate to the lower absorbent core. Therefore, the absorption rate of urine etc. of the absorbent article is increased.

The upper layer absorbent body 11 is formed wider than the lower layer absorbent body 12 over the entire front-rear direction of the absorbent body. By configuring in this way, the upper absorbent body is likely to be bowl-shaped along the crotch portion. The ratio (W1/W2) between the width W1 of the upper absorbent core 11 and the width W2 of the lower absorbent core 12 is preferably 1.03 or more, more preferably 1.07 or more, and still more preferably 1.25 or more. It is preferably 2.0 or less, more preferably 1.67 or less, still more preferably 1.50 or less.

Also, the difference d between the side edge of the upper absorbent core 11 and the side edge of the lower absorbent core 12 (the side of the upper absorbent core 11 extending outward from the side edge of the lower absorbent core 12) The width of the edge) is preferably 2.5 mm or more, more preferably 5.0 mm or more, still more preferably 15 mm or more, and preferably 37.5 mm or less, more preferably 30 mm or less, and still more preferably 25 mm or less. . When the difference d is within the above range, the upper absorbent body tends to be bowl-shaped along the crotch.

1-2. Upper Absorbent Body The upper absorbent body 11 is made of acetate fibers. Since the upper-layer absorbent body is made of acetate fibers, urine and the like are diffused inside the upper-layer absorbent body and easily absorbed by the absorbent body.

The acetate fiber is a semi-synthetic fiber obtained by acetic esterifying cellulose. As the acetate fiber, cellulose diacetate fiber in which 74% or more and less than 92% of the hydroxy groups of cellulose are acetic esterified (degree of esterification: 2.22 or more and less than 2.76), 92% of the hydroxy groups of cellulose cellulose triacetate fibers obtained by acetic esterification (degree of esterification: 2.76 or more), and cellulose diacetate fibers are preferred. The degree of esterification is the average number of hydroxy groups substituted with acetyl groups per glucose unit in cellulose.

The fineness of the acetate fiber (monofilament) is preferably 0.1 dtex or more, more preferably 1.0 dtex or more, still more preferably 1.5 dtex or more, and preferably 16 dtex or less, more preferably 10 dtex or less, and still more preferably 7. .0 dtex or less, particularly preferably 5.0 dtex or less. When the fineness is 0.1 dtex or more, the cushioning property of the upper layer absorbent body is further improved, and when it is 16 dtex or less, the texture of the upper layer absorbent body is further improved.

The cross-sectional shape of the acetate fiber is not particularly limited, and is circular, elliptical, triangular, L-shaped, Y-shaped, X-shaped, W-shaped, eight-lobed, flat (boomerang, wavy, cocoon-shaped). , rectangular parallelepiped, etc.), a polygonal type such as a dog bone type, a multi-leaf type, a hollow type, and an irregular shape. From the viewpoint of improving the dryness after absorbing body fluid, the cross-sectional shape of the acetate fiber is preferably circular or elliptical.

Examples of the form of the acetate fiber include raw cotton (fiber assembly), multifilament yarn, tow obtained by combining multifilament yarns, and open fibers of these multifilament yarns and tows, and raw cotton is preferred.

The upper absorbent body may contain fibers other than acetate fibers. In this case, the content of acetate fibers in the upper absorbent body is 50% by mass or more, preferably 70% by mass, and more preferably 90% by mass or more. In addition, it is most preferable that the upper absorbent body is composed only of acetate fibers. Examples of the other fibers include cellulose fibers, polyester fibers, polyolefin fibers, polyamide fibers, polyvinyl alcohol fibers, and acrylic fibers.

The upper absorbent body preferably does not contain a water-absorbent resin powder, and more preferably does not contain a water-absorbent material.

The basis weight of the upper absorbent body is preferably 5 g/m ² or more, more preferably 10 g/m ² or more, still more preferably 15 g/m ² or more, and preferably 100 g/m ² or less, more preferably 70 g/m 2 . ² or less, more preferably 50/m ² or less. If the basis weight of the upper absorbent layer is 5 g/ ^{m 2} or more, urine and the like can be quickly diffused in the upper absorbent layer, so urine and the like will not remain on the surface material, and leakage will be suppressed. Excessive diffusion is suppressed more than the migration to the lower layer absorbent such as, so that the entire absorbent can be effectively used and leakage is suppressed.

The thickness of the upper absorbent body is preferably 0.1 mm or more, more preferably 0.5 mm or more, still more preferably 1.0 mm or more, and preferably 3.0 mm or less, more preferably 2.0 mm or less. It is preferably 1.5 mm or less. If the thickness is 0.1 mm or more, urine, etc., will quickly diffuse in the upper-layer absorbent material, so urine, etc. will not remain on the surface material, and leakage will be suppressed. Excessive diffusion rather than migration is suppressed, the entire absorbent body can be effectively used, and leakage is suppressed. The thickness of the absorber is measured using a thickness gauge (manufactured by Teclock Co., Ltd., SM-130) so that the final pressure is 2.2 N or less. The anvil and probe have a flat contact surface with the measuring object and have a diameter of 10 mm.

1-3. Lower Absorbent Body The lower absorbent body 12 contains water absorbent resin powder and pulp as absorbent materials. The lower absorbent core 12 is laminated with the upper absorbent core 11 directly or via an adhesive.

As the water absorbent resin powder, those conventionally used in absorbent articles can be used. Although the water-absorbing resin powder is not particularly limited, it is preferable to use a crosslinked polymer containing acrylic acid as a constituent component, in which at least a portion of the carboxy groups are neutralized. The content of the acrylic acid component constituting the crosslinked polymer is preferably 50% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, preferably 99% by mass or less, and 97% by mass or less. more preferred. If the content of the acrylic acid component is within the above range, the resulting water-absorbing resin powder is likely to exhibit desired absorption performance.

The cation that neutralizes at least a portion of the carboxy groups of the crosslinked polymer is not particularly limited, but examples thereof include alkali metal ions such as lithium, sodium and potassium; alkaline earth metal ions such as magnesium and calcium. be able to. Among these, it is preferable that at least part of the carboxy groups of the crosslinked polymer are neutralized with sodium ions. The carboxyl group of the crosslinked polymer may be neutralized by neutralizing the carboxyl group of the crosslinked polymer obtained by polymerization. may be formed.

The degree of neutralization of carboxy groups in the crosslinked polymer is preferably 55 mol % or more, more preferably 60 mol % or more. If the degree of neutralization is too low, the absorption performance of the obtained water absorbent resin powder may be lowered. Moreover, the upper limit of the degree of neutralization is not particularly limited, and all carboxy groups may be neutralized. The degree of neutralization is obtained by the following formula.
Degree of neutralization (mol%) = 100 x "the number of moles of neutralized carboxyl groups in the crosslinked polymer"/"total number of moles of carboxyl groups in the crosslinked polymer (including neutralized and unneutralized)"

Additives such as preservatives, antifungal agents, antibacterial agents, antioxidants, ultraviolet absorbers, coloring agents, fragrances, deodorants, inorganic powders and organic fibrous materials are added to the water absorbent resin powder. may

The basis weight of the water absorbent resin powder in the lower absorbent body is preferably 50 g/m ² or more and preferably 500 g/m ² or less.

Examples of the pulp include wood pulp made from wood; non-wood pulp made from leaves, grass, straw, etc.; waste paper pulp made from waste paper, etc.; recycled pulp recovered from used absorbent articles, etc. mentioned.

The basis weight of the pulp in the lower absorbent body is preferably 100 g/m ² or more, and preferably 500 g/m ² or less.

The lower absorbent body may contain other water absorbent materials in addition to the water absorbent resin powder and pulp. Other absorbent materials include, for example, cellulose fibers, rayon, and the like.

The lower absorbent body may contain a fibrous base material. Examples of the fiber base material include heat-fusible fibers. Heat-fusible fibers are used to improve shape retention. Specific examples of heat-fusible fibers include polyolefin fibers such as polyethylene and polypropylene, polyester fibers, composite fibers, and the like.

The thickness of the lower absorbent body is preferably 1 mm or more, more preferably 3 mm or more, still more preferably 5 mm or more, and preferably 15 mm or less, more preferably 10 mm or less, still more preferably 8 mm or less. If the thickness of the layer absorbent body is 1 mm or more, the feeling of wearing is good and the absorption amount of the absorbent body is improved, and if the thickness is 15 mm or less, discomfort during wearing can be further suppressed.

1-4. Covering Sheet The absorbent body 10 has a covering sheet 13 surrounding the upper absorbent body 11 and the lower absorbent body 12 . The covering sheet 13 surrounds a laminate obtained by laminating the upper absorbent body and the lower absorbent body. The covering sheet 13 surrounds at least the skin surface side plane, the outer surface side plane, and both width direction side surfaces of the laminate. It is preferable that the covering sheet also covers both front and rear end surfaces of the laminate (both front and rear end surfaces of the upper absorbent body and the lower absorbent body). In addition, it is preferable that the covering sheet 13 is not arranged between the upper layer absorbent body 11 and the lower layer absorbent body 12 .

The material of the covering sheet is not particularly limited as long as it has liquid permeability and can suppress scattering of acetate fibers, water absorbent resin powder and pulp. Examples of the material of the covering sheet include tissue paper and liquid-permeable nonwoven fabric.

The basis weight of the covering sheet is preferably 7 g/m ² or more, and preferably 20 g/m ² or less.

Examples of the embodiment of surrounding the laminate with the covering sheet include the embodiment of surrounding the laminate with one covering sheet; the embodiment of surrounding the laminate with two covering sheets, an upper covering sheet and a lower covering sheet; An aspect of surrounding with three or more covering sheets can be mentioned.

As shown in FIG. 2, the covering sheet 13 preferably has an upper covering sheet 13a and a lower covering sheet 13b. Specifically, at least a portion of the skin-side plane of the laminate (skin-side plane of the upper absorbent layer), both widthwise side surfaces of the laminate (both widthwise side surfaces of the upper absorbent core and the lower absorbent core), and , a lower covering sheet covering the outer surface side plane of the laminate (the outer surface side plane of the lower absorbent body), and an upper covering sheet surrounding a portion of the skin surface side plane of the laminate not covered with the lower covering sheet. It is preferred to have By configuring the covering sheet in this way, when the covering sheet surrounds the upper absorbent body and the lower absorbent body, the covering sheet prevents the upper absorbent body from being folded on both sides in the width direction. It becomes easy to maintain the desired shape of both sides in the width direction.

It is preferable that the lower covering sheet 13b covers the regions of both sides in the width direction on the skin surface side of the upper absorbent body. Moreover, it is preferable that the upper covering sheet is laminated with the lower covering sheet on the regions of both sides in the width direction of the upper absorbent body. By configuring in this way, since the laminated portions of the upper covering sheet and the lower covering sheet are formed in the regions on both sides in the width direction of the upper absorbent body, the mechanical strength of the both side edges in the width direction of the upper absorbent body is increased. can be reinforced.

The width (the length of the inwardly folded portion of the upper absorbent body) L1 of the region of the width direction side portion of the upper absorbent body 11 covered by the end of the lower covering sheet 13b is preferably 10 mm or more, more preferably 10 mm or more. It is preferably 20 mm or more, preferably 50 mm or less, and more preferably 40 mm or less. Also, the ratio (L1/ d) is preferably 0.7 or more, more preferably 2.0 or more, and preferably 20 or less, more preferably 6.0 or less.

The width L2 of the laminated portion between the side edge of the upper covering sheet 13a and the side edge of the lower covering sheet 13b is preferably 5 mm or more, more preferably 10 mm or more, and preferably 40 mm or less, more preferably 30 mm. It is below. The ratio (L2/L1) of the width L1 to the width L2 is preferably 0.125 or more, more preferably 0.5 or more, and preferably 1.0 or less, more preferably 0.8 or less. be. In addition, it is preferable that at least a part of the laminated portion of the upper covering sheet 13a and the lower covering sheet 13b is joined with an adhesive.

It is preferable that the absorber 10 is pressed (embossed) in the thickness direction. The positions of the upper absorbent core 11, the lower absorbent core 12 and the covering sheet 13 can be fixed by performing the pressing process. In addition, by performing pressing, the air inside the absorbent body 10 can be removed, and the absorbent body 10 can be compactly housed in a packaging bag.

The shape and arrangement of the embossed portion formed by the pressing process are not particularly limited. Examples thereof include a shape in which straight lines are combined, such as a square lattice shape and a rhombus lattice shape; a fish shape; The shape of each embossed portion may be circular, elliptical, oval, polygonal, corrugated, star-shaped, or the like. When they are provided in a scattered pattern, they may be provided in a regular arrangement pattern or may be provided in a random arrangement pattern. For example, a zigzag pattern, a lattice pattern, or the like can be used. The pressing process may be performed only once or may be performed many times. For example, after forming rhomboid lattice-shaped embossed portions, fish-shaped embossed portions may be further formed.

An adhesive may or may not be placed between the upper absorbent core 11 and the lower absorbent core 12 .
When no adhesive is placed between the upper layer absorbent body 11 and the lower layer absorbent body 12, the acetate fibers forming the upper layer absorbent body 11 can move freely. Therefore, it becomes easier to fit the body when worn, and leakage of body fluids such as urine can be suppressed.

When an adhesive is placed between the upper absorbent core 11 and the lower absorbent core 12, the adhesion between the upper absorbent core and the lower absorbent core can be enhanced, and body fluids and the like diffused inside the upper absorbent core 11 can be removed. can be transferred to the lower absorbent core 12 quickly. When the adhesive is arranged between the upper absorbent body and the lower absorbent body, it is preferable to adopt a coating method such as spiral spray, curtain spray, or the like, which can ensure the liquid permeability of the adhesive layer with a wide coating area.

2. Top Sheet The top sheet is a sheet positioned on the wearer's side when the absorbent article is worn. The material of the top sheet is not particularly limited as long as it is liquid-permeable. The shape of the top sheet in a plan view is not particularly limited, and may be adjusted according to the shape of the absorber and the presence or absence of rising flaps (side sheets).

Examples of the top sheet include hydrophilic nonwoven fabrics, woven fabrics, and knitted fabrics. Examples of the hydrophilic nonwoven fabric include nonwoven fabrics formed from hydrophilic fibers such as cellulose, rayon, and cotton; nonwoven fabrics formed from hydrophobic fibers such as polyolefin (polypropylene, polyethylene), polyester, polyamide, etc. A nonwoven fabric in which the surface of the fiber is hydrophilized with a surfactant is exemplified.

3. Backsheet The backsheet is a sheet located on the side opposite to the wearer, that is, on the outer side when the absorbent article is worn. The material of the back sheet is not particularly limited as long as it is liquid-impermeable. In the present invention, liquid impermeability includes water repellency. The shape of the backsheet in plan view is not particularly limited, and may be adjusted according to the shape of the absorber.

Examples of the backsheet include hydrophobic nonwoven fabrics, plastic films, and laminates of plastic films and nonwoven fabrics. Examples of the hydrophobic nonwoven fabrics include nonwoven fabrics formed from hydrophobic fibers such as polyolefin (polypropylene, polyethylene), polyester, and polyamide. Examples of the plastic film include films formed from resins such as polyolefin (polypropylene, polyethylene), polyester, and polyamide. The nonwoven fabric laminated on the plastic film may be hydrophilic or hydrophobic.

4. Leg Gather It is preferable that elastic members for legs extending in the front-rear direction are arranged in a stretched state between the top sheet and the back sheet on both sides of the absorbent article. Leg gathers are formed by the contractile force of the elastic members for legs, and the absorbent article as a whole becomes bowl-shaped, thereby further preventing leakage of bodily fluids such as urine. The leg elastic members are preferably arranged on the outer side of both side ends of the absorbent body in the width direction of the absorbent article.

The leg elastic members are secured between the topsheet and the backsheet in a stretched state. At this time, the extension ratio of the leg elastic member is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 3.0 times or less, more preferably 2.5 times or less. Note that the expansion ratio is 1.0 in the non-expansion state.

Polyurethane rubber thread, polyurethane rubber film, natural rubber, or the like can be used as the leg elastic member. Further, the leg elastic member is preferably fixed with an adhesive such as a hot-melt adhesive, and more preferably with a rubber-based hot-melt adhesive. The number of leg elastic members, the length in the front-rear direction, and the like may be appropriately adjusted.

5. 3D Gathers It is preferable that rising flaps are arranged on both sides of the absorbent article on the skin surface side of the top sheet. The rising flap has a base that serves as a starting point for rising and a free end that serves as a tip for rising. Side leakage of body fluids such as urine can be prevented by providing the rising flaps.

The rising flap can be composed of a flap-forming sheet. The flap-forming sheet can be composed of a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or the like, and a sheet material that can be used for the back sheet can be used.

The flap forming sheet may be formed by side sheets provided on both sides in the width direction of the top sheet. In this case, the side sheets are joined to the top sheet at the side joining portions, and the portions of the side sheets inward in the width direction from the side joining portions can be used as the flap forming sheets.

It is preferable that a flap elastic member extending in the front-rear direction is arranged in a stretched state at the free end of the rising flap. The contractile force of the flap elastic member promotes the standing up of the rising flap. It is preferable that the flap elastic member is arranged between the folded flap forming sheets by folding back the free ends of the flap forming sheets. That is, it is preferable to dispose the flap elastic member between one portion and the other portion sandwiching the free end of the flap forming sheet folded back at the free end.

The expansion ratio of the flap elastic member is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 2.8 times or less, more preferably 2.4 times or less. Polyurethane rubber thread, polyurethane rubber film, natural rubber, or the like can be used as the flap elastic member. The flap elastic member is preferably fixed with an adhesive such as a hot-melt adhesive, and more preferably with a rubber-based hot-melt adhesive. The number of flap elastic members, the length in the front-rear direction, and the like may be appropriately adjusted.

Further, it is preferable that the base portion of the rising flap is arranged inward in the width direction from the side end portion of the upper layer absorbent body. By configuring in this way, body fluids such as urine on the top sheet can be guided to the upper absorbent body, and leakage can be suppressed.

When the absorbent article has both leg elastic members and flap elastic members, it is preferable that the expansion rate of the leg elastic members is larger than the expansion rate of the flap elastic members. Since the stretch ratio of the elastic member for legs is large, the shape of the absorbent article is likely to be bowl-shaped, and the rising flap fits the user's skin, thereby further preventing leakage of bodily fluids such as urine.

6. Absorbent Article The absorbent article of the present invention includes an incontinence pad, a disposable diaper, a sanitary napkin, a disposable auxiliary pad attached to a disposable diaper main body or a sanitary napkin, and the like.

When the absorbent article is an incontinence pad, a sanitary napkin or a disposable auxiliary pad, an absorbent body is placed, for example, between a liquid-permeable topsheet and a liquid-impermeable backsheet. Shapes of incontinence pads, sanitary napkins or disposable auxiliary pads include hourglass and gourd shapes. If necessary, liquid-impermeable rising flaps may be provided on both sides in the width direction of the liquid-permeable top sheet.

When the absorbent article is a disposable diaper, the disposable diaper is, for example, a tape-type disposable diaper provided with a pair of fastening members on the left and right sides of the back or front abdomen, and formed into a pants shape by the fastening members when worn. Diaper: includes a pants-type disposable diaper in which a waist opening and a pair of leg openings are formed by joining the front abdomen and the back.

When the absorbent article is a disposable diaper, the disposable diaper, for example, forms a diaper body composed of a front abdominal portion, a rear back portion, and a crotch portion positioned between them, by a laminate of inner and outer sheets. , the water absorber may be arranged in the crotch portion. Disposable diapers, for example, are composed of a laminated body in which an absorbent body is arranged between a top sheet and a back sheet, and the laminated body has a front abdomen, a back part, and a crotch part located therebetween. You may have The inner sheet is preferably hydrophilic or water-repellent, and the outer sheet is preferably water-repellent.

It is preferable that the disposable diaper is provided with rising flaps along both side edges. Side leakage of bodily fluids can be prevented by providing the rising flaps. The rising flaps may be formed by rising the inner ends of the side sheets provided on both sides in the width direction of the top sheet. The rising flaps and side sheets are preferably water-repellent.

7. Specific Examples Next, the absorbent article of the present invention will be described with reference to FIGS. 3 to 6, taking a disposable auxiliary pad as an example. In the figure, the arrow x is defined as the width direction, and the arrow y is defined as the front-rear direction. Also, the direction on the plane formed by the arrows x and y is defined as the planar direction. Also, the direction perpendicular to the plane formed by the arrows x and y represents the vertical direction z.

7-1. First Embodiment FIG. 3 shows a plan view of an absorbent article (disposable auxiliary pad). FIG. 4 represents a schematic cross-sectional view of the absorbent article of FIG. 3 taken along line BB.

The auxiliary pad 1 has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent body 10 arranged therebetween. The absorbent body 10 is composed of an upper absorbent body 11, a lower absorbent body 12 arranged on the outer surface side of the upper absorbent body 11, and a covering sheet 13 surrounding the upper absorbent body 11 and the lower absorbent body 12. ing. The upper absorbent body 11 is made of acetate fiber. The lower absorbent body 12 contains water absorbent resin powder and pulp. The upper layer absorbent body 11 is formed wider than the lower layer absorbent body 12 over the entire front-rear direction of the absorbent body 10 .

The cover sheet 13 has an upper cover sheet 13a and a lower cover sheet 13b. The lower covering sheet 13b covers the regions on both sides in the width direction of the skin surface side plane of the upper absorbent core 11, both side surfaces in the width direction of the upper absorbent core 11 and the lower absorbent core 12, and the outer surface side plane of the lower absorbent core 12. cover. The upper covering sheet 13a surrounds the portion of the surface of the upper absorbent body 11 on the skin side that is not covered with the lower covering sheet 13b. Further, the upper covering sheet 13a is laminated with the lower covering sheet 13b on the regions of both sides of the upper absorbent body 11 in the width direction.

On both sides of the auxiliary pad 1, between the top sheet 2 and the back sheet 3, leg elastic members 4 extending in the front-rear direction are arranged in a stretched state. Further, an adhesive 5 for fixing the auxiliary pad 1 is provided on the outer surface side of the back sheet 3 . Note that the adhesive 5 is protected by a release sheet (not shown) until it is put on.

In FIG. 3, the auxiliary pad 1 and the absorber 10 have a rectangular plan view shape, but they may have an hourglass shape or a gourd shape. In FIG. 3, two leg elastic members 4 are arranged on each side of the auxiliary pad 1, but the number and length of the leg elastic members 4 may be adjusted appropriately.

7-2. Second Embodiment FIG. 5 shows a plan view of an absorbent article (disposable auxiliary pad). FIG. 6 represents a schematic cross-sectional view of the absorbent article of FIG. 5 taken along line CC. In the following description, parts that overlap with the embodiments of FIGS. 3 and 4 are denoted by the same reference numerals, and descriptions thereof are omitted.

In the auxiliary pad 1 shown in FIGS. 5 and 6, side sheets 6 extending in the front-rear direction y of the auxiliary pad 1 are joined to both side edges of the top sheet 2 in the width direction x. The side sheet 6 is made of a liquid-impermeable plastic film, a water-repellent nonwoven fabric, or the like. The side sheet 6 is joined to the top sheet 2 at the rising base portion 61, and the inner side of the rising base portion 61 is a free end that can be raised. A flap elastic member 7 is provided at the free end of the side sheet 6, and a rising flap is formed by contraction force of the flap elastic member.

The rising base portion 61 is arranged inward in the width direction from the side end portion of the upper absorbent core 11 . Further, the leg elastic member 4 and the flap elastic member 7 are arranged so that the expansion ratio of the leg elastic member 4 is larger than the expansion ratio of the flap elastic member 7 .

The absorbent body of the present invention can be suitably used, for example, in absorbent articles used to absorb body fluids discharged from the human body, and is particularly suitably used as absorbent articles such as incontinence pads, disposable diapers, and sanitary napkins. can.

1: Absorbent article (auxiliary pad), 2: Top sheet, 3: Back sheet, 4: Leg elastic member, 5: Adhesive, 6: Side sheet, 61: Standing base, 7: Flap elastic member, 10 : Absorbent 11: Upper Absorbent 12: Lower Absorbent 13: Covering Sheet 13a: Upper Covering Sheet 13b: Lower Covering Sheet

Claims (7)

An absorbent article comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet,
The absorbent body comprises an upper absorbent body, a lower absorbent body arranged on the back sheet side of the upper absorbent body, and a covering sheet surrounding the upper absorbent body and the lower absorbent body,
The upper absorbent body is formed only from acetate fibers,
The lower absorbent body contains water absorbent resin powder and pulp,
The upper layer absorbent body is formed wider than the lower layer absorbent body over the entire front-rear direction of the absorbent body,
the lower covering sheet covering at least a portion of the skin surface side plane of the upper layer absorbent body, both widthwise side surfaces of the upper layer absorbent body and the lower layer absorbent body, and the outer surface side plane of the lower layer absorbent body; an upper covering sheet surrounding a portion of the skin surface side plane of the upper absorbent body that is not covered with the lower covering sheet;
The lower covering sheet covers the regions on both sides in the width direction on the skin surface side of the upper absorbent body, and the upper covering sheet is laminated with the lower covering sheet on the regions on both sides in the width direction of the upper absorbent body. An absorbent article characterized by: The width d of the upper absorbent body extending outward from the side edge of the lower absorbent body at the width direction side edge of the absorbent body and the width direction side of the upper absorbent body covered by the end of the lower covering sheet 2. The absorbent article according to claim 1, wherein the ratio (L1/d) to the width L1 of the portion region is 0.7-20. 3. The absorbent article according to claim 1, wherein leg elastic members extending in the front-rear direction are arranged in a stretched state between the top sheet and the back sheet on both sides of the absorbent article. On both sides of the absorbent article, rising flaps are arranged on the skin surface side of the top sheet,
The rising flap has a base that serves as a starting point for rising and a free end that serves as a leading edge of the rising,
A flap elastic member extending in the front-rear direction is arranged in a stretched state at the free end of the rising flap,
4. The absorbent article according to claim 3, wherein the leg elastic member has a larger extension ratio than the flap elastic member. On both sides of the absorbent article, rising flaps are arranged on the skin surface side of the top sheet,
The rising flap has a base that serves as a starting point for rising and a free end that serves as a leading edge of the rising,
A flap elastic member is arranged in a stretched state at the free end of the rising flap,
5. The absorbent article according to any one of claims 1 to 4, wherein the base portion is arranged inward in the width direction from the side end portions of the upper absorbent body. The absorbent article according to any one of claims 1 to 5, wherein the absorbent body is press-processed in the thickness direction. The absorbent article according to any one of claims 1 to 6, wherein an adhesive is arranged between the upper layer absorbent body and the lower layer absorbent body.

Images