JP7160854B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

Conventionally, absorbent articles such as disposable diapers have been used. For example, in the absorbent article of Patent Document 1, leg elastic bodies are provided on both laterally outer sides of the absorbent structure, and a vertically extending liquid absorbent elastic body is provided at the lateral center of the absorbent structure. be done. This prevents occurrence of large wrinkles in the central portion. In addition, in the absorbent article, by providing the inelastic region in which the leg elastic body and the absorbent elastic body are not arranged in the rear waist region, the rear waist region is prevented from being wrinkled. In the absorbent article of Patent Document 2, an opening extending in the front-rear direction is formed in the widthwise central portion of the absorbent core, and central elastic members extending in the front-rear direction overlapping the absorbent core are provided along the outer edges on both sides of the opening. be provided. In the absorbent article, the opening forms a shape in which the absorbent core is recessed in the width direction in the crotch area of the wearer. In addition, due to the presence of the central elastic member, even if the absorbent core absorbs urine or the like, the absorbent core is prevented from being greatly recessed.

JP 2014-79292 A JP 2017-51349 A

By the way, in the absorbent article of Patent Document 2, it is conceivable that the central elastic member extending in the front-rear direction crosses the rear waist elastic member provided along the rear end edge of the main body portion. This allows the rear portion of the absorbent article to be brought into close contact with the wearer's skin. However, in this case, contraction of the rear waist elastic member draws the portion near the rear edge of the main body toward the center in the width direction, and contraction of the central elastic member draws the portion toward the absorbent core. As a result, when the absorbent article is contracted, the rear edge of the main body portion is greatly curved toward the absorbent core, and the appearance of the absorbent article deteriorates. Further, when the absorbent article is a tape-type disposable diaper, when the absorbent article is put on the wearer, the rear portion of the main body portion is aligned with the wearer's waist circumference, but the rear end edge It is difficult to align the position of the absorbent article when the absorbent article is worn with a curved absorbent article.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to prevent the rear edge of the main body portion from being excessively curved when the absorbent article is contracted.

The invention according to claim 1 is an absorbent article, which is a sheet member provided with an absorbent core and extending in the longitudinal direction, the main body portion having a front portion, a crotch portion and a rear portion in order in the longitudinal direction. a pair of side sheets spaced apart in a width direction substantially perpendicular to the longitudinal direction on the main body; and a rear waist elastic member provided along the rear edge of the main body in the rear portion, extending in the width direction, and not overlapping the absorbent core when the main body is viewed from above. and, provided on the central auxiliary seat from at least the crotch portion to the rear portion, when the main body portion is viewed in plan, the crotch portion overlaps with the absorbent core, and the rear portion is the rear waist elastic member. and a central elastic member intersecting with the central auxiliary seat, wherein the central auxiliary seat has a fixed portion extending in the longitudinal direction and fixed to a central portion of the main body portion in the width direction, and both outer sides of the fixed portion in the width direction. and a pair of flap portions extending in the longitudinal direction together with the fixing portion, each flap portion being provided with an elastic element of the central elastic member, and contraction of the central elastic member causes each flap portion to rise toward the wearer to form central gathers, and between the rear end edge of the absorbent core positioned at the rear portion and the rear waist elastic member in a state in which the main body portion is stretched in the longitudinal direction. is 25 mm or less, and the rear waist elastic member includes a plurality of elastic elements extending in the width direction, the plurality of elastic elements intersecting with the central elastic member and a first elastic element. , a second elastic element disposed between the first elastic element and the rear edge of the body portion and not crossing the central elastic member .
The invention according to claim 2 is an absorbent article, which is a sheet member provided with an absorbent core and extending in the longitudinal direction, the main body portion having a front portion, a crotch portion and a rear portion in order in the longitudinal direction. a pair of side sheets spaced apart in a width direction substantially perpendicular to the longitudinal direction on the main body; and a rear waist elastic member provided along the rear edge of the main body in the rear portion, extending in the width direction, and not overlapping the absorbent core when the main body is viewed from above. a front waist elastic member provided along the front end edge of the main body portion in the front portion and extending in the width direction; a central elastic member that overlaps the absorbent core at the crotch portion, intersects the rear waist elastic member at the rear portion, and does not intersect the front waist elastic member at the front portion when viewed from above, A central auxiliary sheet extends in the longitudinal direction, and has a fixed portion fixed to a central portion of the main body portion in the width direction, and a central auxiliary sheet continuous to both outer sides of the fixed portion in the width direction, and extending in the longitudinal direction together with the fixed portion. Each flap is provided with an elastic element of the central elastic member, and contraction of the central elastic member causes each flap to rise toward the wearer and form a central gather. is formed, and the distance between the rear end edge of the absorbent core located in the rear portion and the rear waist elastic member is 25 mm or less when the main body portion is stretched in the longitudinal direction.

The invention according to claim 3 is the absorbent article according to claim 1 or 2 , wherein the rear part is attached to both sides of the rear part and fastened to the outer surface of the front part. further comprising a pair of connecting portions connecting the side portions of the to the front portion.

The invention according to claim 4 is the absorbent article according to claim 3 , wherein each connecting portion comprises a first fastening tape extending in the width direction, and a connection between the first fastening tape and the body portion. a second fixing tape disposed between the rear end edge and extending in the width direction;

The invention according to claim 5 is the absorbent article according to claim 4 , wherein the rear end edge of the absorbent core is the center extending in the width direction of the second fastening tape with respect to the longitudinal direction. located between a line and the trailing edge of the body.

The invention according to claim 6 is the absorbent article according to any one of claims 1 to 5 , wherein the elongation rate of the central elastic member when joined to the main body is 1.7 times. It is below.

The invention according to claim 7 is the absorbent article according to any one of claims 1 to 6 , wherein in the absorbent core, the width in the width direction at the rear part is the width at the crotch part. bigger than

The invention according to claim 8 is the absorbent article according to any one of claims 1 to 7 , wherein both ends of the rear waist elastic member are aligned with the rear end of the absorbent core in the width direction. Located inside the ends of the edge.

According to the present invention, it is possible to prevent the rear edge of the main body portion from being excessively curved when the absorbent article is contracted.

1 is a plan view showing an absorbent article; FIG. 1 is a cross-sectional view showing an absorbent article; FIG. It is a perspective view which shows an absorbent article. It is a figure which expands and shows the connection part vicinity. FIG. 4 is a diagram for explaining a state in which the absorbent article is folded; FIG. 4 is a diagram for explaining a state in which the absorbent article is folded; FIG. 5 is a diagram for explaining the curvature of the rear end edge of the main body; FIG. 10 is a diagram showing an absorbent article of a comparative example; FIG. 10 is a diagram for explaining the curvature of the rear edge of the main body in an absorbent article of a comparative example; FIG. 10 is a diagram showing another example of an absorbent article;

FIG. 1 is a plan view showing an absorbent article 1 in an unfolded state according to one embodiment of the present invention. The absorbent article 1 is a tape-type disposable diaper in which a portion that contacts the wearer's abdomen and a portion that contacts the back of the wearer are connected by a pair of connecting portions 4 around the waist. The absorbent article 1 receives excrement from the wearer. In FIG. 1, the absorbent article 1 is depicted with the side that comes into contact with the wearer when worn (that is, the wearer side) facing forward.

FIG. 2 is a cross-sectional view of the absorbent article 1 cut along a plane perpendicular to the longitudinal direction (that is, the longitudinal direction in FIG. 1) at the position II-II shown in FIG. In FIG. 2, for the convenience of illustration, each configuration of the absorbent article 1 is simplified and drawn separately in the thickness direction (vertical direction in FIG. 2).

As shown in FIGS. 1 and 2, the absorbent article 1 includes a body portion 2 which is a sheet member extending in the longitudinal direction, a pair of side sheets 3, and a central auxiliary sheet 5. As shown in FIGS. The pair of side sheets 3 extends in the longitudinal direction of the main body 2 on both sides of the main body 2 (that is, both ends in the width direction substantially perpendicular to the longitudinal direction). The central auxiliary seat 5 extends longitudinally between the pair of side seats 3 on the main body portion 2 . In the example shown in FIG. 1, the pair of side seats 3 and center auxiliary seat 5 are provided over approximately the entire length of the main body 2 in the longitudinal direction. The details of the side seats 3 and the central auxiliary seat 5 will be described later. In the following description, the portion between the pair of side seats 3 in the main body portion 2 shown in FIG. 1 is called "central portion". The central portion of the body portion 2 is a belt-like portion that extends in the longitudinal direction over approximately the entire length of the body portion 2 at the center in the width direction.

A lower portion 201 and an upper portion 203 in FIG. 1 of the body portion 2 contact the wearer's ventral and dorsal skin, respectively. In the following description, the parts 201 and 203 are called "front part 201" and "rear part 203", respectively. A portion 202 between the front portion 201 and the rear portion 203 that is continuous from the front portion 201 and the rear portion 203 is called a "crotch portion 202". The crotch portion 202 faces the crotch portion of the wearer. In the absorbent article 1, the body portion 2 has a front portion 201, a crotch portion 202 and a rear portion 203 in order in the longitudinal direction. In the example shown in FIG. 1 , the width in the width direction of the front portion 201 and the rear portion 203 (hereinafter also simply referred to as “width”) is greater than the width of the crotch portion 202 . That is, in plan view, the absorbent article 1 has a so-called hourglass shape.

An outer surface of the front portion 201 on the side opposite to the wearer is provided with a receiving portion 29 (see FIG. 3). The attachment portion 29 is a hook-and-loop fastener loop member, and is attached to the outer surface of the front portion 201 with a hot-melt adhesive or the like. As shown in FIG. 1, the absorbent article 1 further includes a pair of connecting portions 4. As shown in FIG. A pair of connecting portions 4 are attached to both sides of the rear portion 203 . A fastening portion 410, which will be described later, is provided on the inner surface (the surface facing the wearer) of the pair of connection portions 4. As shown in FIG. The fastening portion 410 is a hook member of a hook-and-loop fastener that can be fastened to the fastening portion 29 . Details of the connecting portion 4 will be described later.

When the absorbent article 1 is put on the wearer, the front part 201 and the rear part 203 of the body part 2 are brought into contact with the abdomen and the back of the wearer, respectively, and the pair of absorbent articles 1 are attached as shown in FIG. is attached to the outer surface of the front portion 201 , more specifically, to the attached portion 29 . Thereby, both sides of the rear part 203 are connected to the front part 201 (typically, both sides of the front part 201).

As shown in FIGS. 1 and 2, the body portion 2 includes a top sheet 21, an absorbent core 22, and a back sheet . The top sheet 21 is a liquid-permeable sheet member. The back sheet 23 is a liquid-repellent or liquid-impermeable sheet member. The absorbent core 22 has a substantially sheet shape extending in the longitudinal direction and is arranged between the top sheet 21 and the back sheet 23 . The main surface of the absorbent core 22 facing the wearer is covered with the top sheet 21 . The other main surface of the absorbent core 22 , that is, the main surface opposite to the wearer is covered with the back sheet 23 . In FIG. 1, the outline of the absorbent core 22 is drawn with a thick dashed line for easy understanding of the drawing.

In the example shown in FIG. 1 , the edges at both ends of the absorbent core 22 in the longitudinal direction extend substantially straight in the width direction along the edges at both ends of the body portion 2 . In the following description, among these edges, the edge located in the front portion 201 will be referred to as the "front edge", and the edge located in the rear portion 203 will be referred to as the "rear edge". The front edge 226 of the absorbent core 22 is spaced from the front edge 206 of the body 2 and the rear edge 227 of the absorbent core 22 is also spaced from the rear edge 207 of the body 2 in the longitudinal direction.

The width of the absorbent core 22 at the front portion 201 and the rear portion 203 is greater than the width of the absorbent core 22 at the crotch portion 202 . In other words, the absorbent core 22 has a so-called hourglass shape in plan view. In addition, the absorbent core 22 is provided with an opening 221 (which may be a recess) extending in the longitudinal direction at the central portion. The opening 221 is located between and spaced from the front edge 226 and the rear edge 227 of the absorbent core 22 . The shape of the absorbent core 22 may be changed arbitrarily, and the opening 221 may be omitted.

The topsheet 21 is secured to the backsheet 23 around the absorbent core 22 . Fixing of the top sheet 21 and the back sheet 23 is performed, for example, via a hot-melt adhesive. The fixation of the top sheet 21 and the back sheet 23 may be performed by thermal fusion bonding, ultrasonic bonding, or the like. In the example shown in FIG. 2 , the width of the top sheet 21 is smaller than the width of the back sheet 23 , and both side portions of the back sheet 23 extend outward in the width direction from both side edges of the top sheet 21 .

The topsheet 21 quickly captures moisture from the wearer's exudates and transfers the moisture to the absorbent core 22 . The absorbent core 22 absorbs and fixes moisture permeating through the top sheet 21 (that is, moisture in excrement from the wearer). The back sheet 23 prevents water and the like of the excrement reaching the back sheet 23 from seeping out of the main body 2 .

As shown in FIG. 1 , the front portion 201 is provided with a front waist elastic member 24 extending in the width direction along a front edge 206 . The front waist elastic member 24 is bonded, for example, between the top sheet 21 and the back sheet 23 in a stretched state with a hot-melt adhesive or the like. The front waist elastic member 24 includes at least one elastic element 241 extending in the width direction. In the example of FIG. 1 , the front waist elastic member 24 includes multiple elastic elements 241 . Also, the length of the front waist elastic member 24 is shorter than the length of the front edge 226 of the absorbent core 22 . Both ends of the front waist elastic member 24 are located inside the both ends of the front edge 226 of the absorbent core 22 in the width direction. Both ends of the front waist elastic member 24 are both ends of a portion that applies a contractile force to the body portion 2 . The same applies to the rear waist elastic member 25, which will be described later.

A rear waist elastic member 25 extending in the width direction is provided along the rear end edge 207 of the rear portion 203 . The rear waist elastic member 25 is bonded, for example, between the top sheet 21 and the back sheet 23 with a hot-melt adhesive or the like in a stretched state. The rear waist elastic member 25 includes at least one elastic element 251 extending in the width direction. In the example of FIG. 1 , the rear waist elastic member 25 includes multiple elastic elements 251 . Also, the length of the rear waist elastic member 25 is shorter than the length of the rear end edge 227 of the absorbent core 22 . Both ends of the rear waist elastic member 25 are located inside the both ends of the rear edge 227 of the absorbent core 22 in the width direction. In the absorbent article 1, waist gathers are formed by contraction of the front waist elastic member 24 and the rear waist elastic member 25, and when the absorbent article 1 is worn, the main body portion 2 is in close contact with the waist of the wearer.

In the body portion 2, a pair of core side elastic members 26 extending in the longitudinal direction are provided in the vicinity of both outer sides of the central portion in the width direction (that is, the portion between the pair of side sheets 3). A pair of core-side elastic members 26 are arranged near both sides of the absorbent core 22 and joined to the main body 2 in a stretched state with a hot-melt adhesive or the like. Each core side elastic member 26 includes at least one longitudinally extending elastic element. In the example of FIG. 1 , one end of the core side elastic member 26 in the longitudinal direction is positioned near the boundary between the front portion 201 and the crotch portion 202 . The other end of the core side elastic member 26 overlaps the absorbent core 22 at the rear portion 203 and is arranged at a position away from the rear end edge 227 of the absorbent core 22 toward the crotch portion 202 side. In the absorbent article 1, contraction of the pair of core-side elastic members 26 lifts both sides of the absorbent core 22 toward the wearer. In this specification, the expression that two members are overlapped means that when the absorbent article 1 is viewed from above (that is, the absorbent article 1 in a state of being spread in the longitudinal direction and the width direction as shown in FIG. ) means that both members overlap. The same is true in the expression that two members intersect.

A pair of leg elastic members 27 extending in the longitudinal direction are provided on both sides of the main body 2 . The pair of leg-surrounding elastic members 27 are arranged outside the absorbent core 22 in the width direction, and are joined to the main body 2 in a stretched state with a hot-melt adhesive or the like. Each leg elastic member 27 includes at least one longitudinally extending elastic element. In the example of FIG. 1 , one end of the leg elastic member 27 in the longitudinal direction is positioned near the boundary between the front portion 201 and the crotch portion 202 . The other end of the leg-surrounding elastic member 27 is arranged at a position away from the rear end edge 227 of the absorbent core 22 toward the crotch part 202 in the longitudinal direction. Typically, the leg elastic members 27 do not overlap the absorbent core 22 . Contraction of the leg-surrounding elastic members 27 causes the fixing portions 33 of the side sheets 3 and the back sheet 23 to rise toward the wearer, forming leg gathers that closely adhere to the vicinity of the base of the wearer's legs.

In the example of FIG. 2, the back sheet 23 is a laminate of a plurality of sheets (of course, it may be a single layer sheet), and the core side elastic members 26 and the leg-surrounding elastic members 27 are the back sheet. 23 adjacent sheets. The core-side elastic members 26 and the leg-surrounding elastic members 27 may be arranged between other sheets.

Each of the pair of side sheets 3 includes a liquid-repellent or liquid-impermeable side sheet main body 31 and side wall elastic members 35 . The side seat main body 31 includes a fixing portion 33 and side wall portions 34 . The fixed portions 33 are fixed on the side portions of the top sheet 21 and on the side portions of the back sheet 23 extending outward in the width direction from the top sheet 21 . The fixing portion 33 and the top sheet 21 and the back sheet 23 are fixed via an adhesive such as a hot-melt adhesive. The fixing portion 33 and the top sheet 21 and the back sheet 23 may be fixed by thermal fusion bonding, ultrasonic bonding, or the like.

The side wall portion 34 continues to the inner side in the width direction of the fixing portion 33 and extends in the longitudinal direction together with the fixing portion 33 . In the absorbent article 1 , a pair of side wall portions 34 are provided on the top sheet 21 side near both side portions of the absorbent core 22 . A side wall elastic member 35 extending in the longitudinal direction is joined in a stretched state to the end portion of each side wall portion 34, that is, the free end, with a hot-melt adhesive or the like. Side wall elastic member 35 includes at least one longitudinally extending elastic element. Contraction of the side wall elastic member 35 causes the side wall portion 34 to rise toward the wearer, forming a three-dimensional gather. In FIG. 2, the side wall elastic member 35 is joined to the single-layered side seat body 31, but the side seat body 31 is a laminate of a plurality of sheets, and the side seat body 31 is composed of sheets adjacent to each other. A side wall elastic member 35 may be arranged therebetween. The same applies to the later-described auxiliary seat body 51 and central elastic member 52 of the central auxiliary seat 5 .

As shown in FIG. 2 , the central auxiliary sheet 5 includes a liquid-repellent or liquid-impermeable auxiliary sheet body 51 and central elastic members 52 . The auxiliary seat body 51 includes one fixed portion 53 and a pair of flap portions 54 . The fixed portion 53 extends in the longitudinal direction and is fixed to the top sheet 21 at the central portion of the body portion 2 . The fixing portion 53 and the top sheet 21 are fixed via an adhesive such as a hot-melt adhesive. The fixation between the fixing portion 53 and the top sheet 21 may be performed by thermal fusion bonding, ultrasonic bonding, or the like. The pair of flap portions 54 are continuous on both outer sides of the fixing portion 53 in the width direction and extend in the longitudinal direction together with the fixing portion 53 . Each flap portion 54 is provided between the fixed portion 53 and the side seat 3 . In the flap portion 54 shown in FIG. 1 , both ends in the longitudinal direction are fixed to the top sheet 21 in the same manner as the fixing portion 53 , and the portion between the ends is not fixed to the top sheet 21 . It is preferable that the ends of the flap portions 54 fixed to the top sheet 21 overlap the ends of the absorbent core 22 and the front waist elastic member 24 or the rear waist elastic member 25 .

The central elastic member 52 includes at least one longitudinally extending elastic element 521 and is joined to the auxiliary sheet body 51 in a stretched state by hot-melt adhesive or the like. In the example of FIG. 1, the central elastic member 52 includes multiple elastic elements 521 . The elongation rate of the central elastic member 52 when joined to the body portion 2 is, for example, 1.7 times or less, preferably 1.6 times or less, and more preferably 1.5 times or less. The elongation rate of the central elastic member 52 is, for example, 1.1 times or more. In the example of FIG. 1, the contractile force of the central elastic member 52 (the contractile force per unit width in the direction perpendicular to the longitudinal direction of the elastic member) is the front waist elastic member 24, the rear waist elastic member 25, and the core side elastic members. 26, smaller than the contractile force of both the leg-surrounding elastic member 27 and the side wall elastic member 35.

The central elastic member 52 is provided from the front portion 201 to the rear portion 203 . When the absorbent article 1 is viewed in plan, the central elastic member 52 overlaps the absorbent core 22 in each of the front portion 201 , the crotch portion 202 and the rear portion 203 . In the example of FIG. 1 , one longitudinal end (front end) of the central elastic member 52 is located near the front edge 226 of the absorbent core 22 . The central elastic member 52 does not cross the front waist elastic member 24 . The other end (rear end) of the central elastic member 52 is located between the rear end edge 227 of the absorbent core 22 and the rear end edge 207 of the main body portion 2 . As shown in FIG. 4 , the central elastic member 52 intersects the elastic element 251 closest to the absorbent core 22 in the rear waist elastic member 25 and does not intersect the elastic element 251 closest to the rear edge 207 of the body portion 2 . Depending on the design of the absorbent article 1 , the central elastic member 52 may intersect all elastic elements 251 of the rear waist elastic members 25 .

As shown in FIG. 2 , some elastic elements 521 among the plurality of elastic elements 521 are arranged on the fixed portion 53 , and the remaining elastic elements 521 are arranged on the flap portion 54 . The elastic elements 521 arranged in the fixing portion 53 are preferably arranged on both sides in the width direction of the opening 221 of the absorbent core 22 and do not overlap with the opening 221 . Also, each flap portion 54 is preferably provided with two or more elastic elements 521 . In the absorbent article 1, contraction of the central elastic member 52 causes the flap portion 54 to rise toward the wearer, forming a central gather. Further, the central elastic member 52 intersects the rear waist elastic member 25, so that the rear portion 203 of the body portion 2 can be brought into close contact with the wearer's skin.

For example, when an auxiliary absorbent (inner pad) is attached to the inner surface of the absorbent article 1 and the absorbent article 1 is used as an exterior article (so-called outer), the central gathers allow the auxiliary absorbent to be lifted toward the wearer. becomes. Moreover, even when the auxiliary absorbent device is not used, in a state in which water such as urine excreted by the wearer is absorbed by the absorbent core 22, the weight of the absorbent core 22 causes a large depression so that the absorbent core 22 separates from the wearer's crotch region. This can be suppressed by the central elastic member 52 (particularly, the elastic element 521 provided on the fixing portion 53).

Here, attention is paid to the gap G1 between the rear end edge 227 of the absorbent core 22 and the rear waist elastic member 25 shown in FIG. In the absorbent article 1, the distance D1 of the gap G1 in the longitudinal direction (the distance D1 at the position of the central elastic member 52) is 25 mm or less when the body portion 2 is stretched in the longitudinal direction. In the preferred absorbent article 1, the distance D1 of the gap G1 is smaller than the distance of the gap (see FIG. 1) between the front edge 226 of the absorbent core 22 and the front waist elastic member 24, for example 3 times the distance of the gap. /4 or less. As will be described later, when the distance D1 of the gap G1 is small, the rear edge 207 of the main body 2 is prevented from being excessively curved. To further suppress the bending of the trailing edge 207, the distance D1 of the gap G1 is preferably 22 mm or less, more preferably 18 mm or less.

The absorbent core 22 contains at least one of granular or fibrous superabsorbent material and hydrophilic fiber aggregates as an absorbent material, for example. As the superabsorbent material, for example, a granular superabsorbent polymer (SAP (Super Absorbent Polymer)) or a fibrous superabsorbent fiber (SAF (Super Absorbent Fiber)) is used. The aggregate of hydrophilic fibers is formed, for example, from pulverized pulp fibers or cellulose fibers. In the present embodiment, the absorbent core 22 is formed by wrapping a mixture of the aforementioned hydrophilic fiber assembly with granular SAP in tissue paper, liquid-permeable nonwoven fabric, or the like. As a result, it is possible to prevent the hydrophilic fiber assembly from losing its shape and the SAP from falling off (especially from falling off after liquid absorption). The front edge 226 and the rear edge 227 of the absorbent core 22 are the edge of the region where the superabsorbent material exists or the edge of the aggregate of hydrophilic fibers. It is not an edge such as a non-woven fabric that wraps around the aggregate.

The top sheet 21 is made of, for example, a liquid-permeable nonwoven fabric. The nonwoven fabric is formed of, for example, hydrophobic fibers (polypropylene, polyethylene, polyester, polyamide, nylon, etc.) whose surface is hydrophilically treated with a surfactant. The nonwoven fabric may be formed from hydrophilic fibers such as cellulose, rayon or cotton. The nonwoven fabric is, for example, an air-through nonwoven fabric, a point-bonded nonwoven fabric, a spunbonded nonwoven fabric, a spunlaced nonwoven fabric, or the like.

The back sheet 23 is, for example, a liquid-impermeable or liquid-repellent nonwoven fabric (spunbond nonwoven fabric, meltblown nonwoven fabric, SMS (spunbond-meltblown-spunbond) nonwoven fabric, etc.) formed of hydrophobic fibers, or an impermeable It is formed of a liquid or liquid repellent plastic film. The back sheet 23 may be a laminate of the nonwoven fabric and the plastic film. When a plastic film is used for the back sheet 23, a plastic film having moisture permeability (that is, breathability) is used from the viewpoint of preventing stuffiness of the absorbent article 1 and improving the wearer's comfort. preferably.

The side sheet main body 31 and the auxiliary seat main body 51 are made of, for example, a liquid-impermeable or liquid-repellent nonwoven fabric (air-through nonwoven fabric, point-bonded nonwoven fabric, spunbonded nonwoven fabric, meltblown nonwoven fabric, SMS nonwoven fabric, etc.) made of hydrophobic fibers. Formed by As the elastic elements of the elastic members 24 to 27, 35, 52, for example, polyurethane threads, band-like polyurethane films, or string-like or band-like natural rubbers are used. In this embodiment, a polyurethane thread is used as the elastic element.

As shown in FIG. 4 , each connecting portion 4 includes two fastening tapes 41 and one common base portion 42 . The two fixing tapes 41 are arranged in the longitudinal direction of the main body 2 (vertical direction in FIG. 4). Each fastening tape 41 extends in the width direction of the main body 2 (horizontal direction in FIG. 4). The common base portion 42 has a substantially rectangular shape and is positioned on the body portion 2 side of the two fastening tapes 41 . The structure and shape of the two fastening tapes 41 are substantially the same.

Each fastening tape 41 includes a tape base portion 413 and fastening portions 410 . The tape base 413 is tape-shaped (strip-shaped) extending in the width direction. The fastening portion 410 includes a first fastening portion 411 and a second fastening portion 412 . In FIGS. 1 and 4, the first fastening portion 411 and the second fastening portion 412 are hatched in parallel to facilitate understanding of the drawings. Each of the first fastening portion 411 and the second fastening portion 412 is provided on the inner surface of the tape base portion 413 (surface on the front side in FIG. 4), and crosses the tape base portion 413 in the longitudinal direction of the main body portion 2. . The first fastening portion 411 is provided on the tip side of the tape base portion 413 (the side opposite to the main body portion 2 ), and the second fastening portion 412 is provided on the root side of the tape base portion 413 . An intermediate region 416 having no fastening portion is provided between the first fastening portion 411 and the second fastening portion 412 on the inner surface of the tape base portion 413 . Each of the first fastening portion 411 and the second fastening portion 412 is a hook member of a hook-and-loop fastener, and has a fine hook structure that is an assembly of many fine hook elements.

In the absorbent article 1 of FIG. 4 , the two tape bases 413 of the two fastening tapes 41 and the common base 42 are part of one connection sheet, and the two tape bases 413 are respectively connected to the common base 42 protrudes outward in the width direction of the main body from the Further, the inner end portion of the common base portion 42 is sandwiched and joined between the side sheet 3 and the back sheet 23 of the main body portion 2 . A portion of the common base portion 42 other than the inner end portion protrudes outward in the body width direction from the body portion 2 .

As described above, the attachment receiving portion 29 (see FIG. 3) of the front portion 201 is a hook-and-loop fastener loop member, and has a fine loop structure that is an assembly of numerous fine loop elements. The micro hook structures of the first fastening portion 411 and the second fastening portion 412 are mutually engageable with the micro loop structure of the fastening portion 29 . That is, the fastening portion 410 of the fastening tape 41 can be fastened to the fastening portion 29 . As described above, in the absorbent article 1 , the fastening portions 410 of the fastening tapes 41 are fastened to the fastening portions 29 , thereby connecting both sides of the rear portion 203 to the front portion 201 . be.

Here, in each connection portion 4, the lower fastening tape 41 in FIG. 4 is called "first fastening tape 41", and the upper fastening tape 41 is called "second fastening tape 41". The second fastening tape 41 is arranged between the first fastening tape 41 and the rear edge 207 of the main body 2 in the longitudinal direction. In the first fastening tape 41 and the second fastening tape 41 , assuming center lines C 1 and C 2 extending in the width direction, both center lines C 1 and C 2 intersect the absorbent core 22 . In addition, the rear edge 227 of the absorbent core 22 is located between the center line C2 of the second fastening tape 41 and the rear edge 207 of the main body 2 in the longitudinal direction. Therefore, when the pair of connecting portions 4 are attached to the attached portion 29, the portion near the rear edge 227 of the absorbent core 22 is brought into firm contact with the skin on the back side of the wearer, thereby Leakage of excrement can be suppressed.

In addition, in the absorbent article 1, as the distance D1 of the gap G1 between the rear end edge 227 of the absorbent core 22 and the rear waist elastic member 25 is reduced (to 25 mm or less), the second fastening tape The distance between the centerline C2 of 41 and the rear end edge 207 of body portion 2 is also made relatively small. As a result, the absorbent article 1 can be worn on the wearer so that the rise is deep.

Next, a state in which the absorbent article 1 is folded will be described. The absorbent article 1 is accommodated in a predetermined packaging bag in a folded state. In one example, each fastening tape 41 is folded inward, as shown in FIG. In the preferred absorbent article 1, the first fastening portion 411 and the second fastening portion 412 can also be fastened to the connecting portion sheet. In this case, the first fastening portion 411 is fastened to the common base portion 42 and the second fastening portion 412 is fastened to the intermediate region 416 . Note that, when manufacturing the absorbent article 1, the connection portion 4 may be joined to the main body portion 2 in a state in which each fastening tape 41 is preliminarily folded toward the inner surface side as shown in FIG.

Subsequently, as shown in FIG. 6, the common base portion 42 of the connection portion 4 is folded toward the side seat 3 using the side edge of the main body portion 2 along the longitudinal direction as a folding line. In the state shown in FIG. 6 , most of the tape base 413 is sandwiched between the common base 42 and the side sheet 3 , and the entire connecting portion 4 is overlapped on the side of the main body 2 . At this time, the width of the absorbent core 22 in the rear portion 203 is wide, and the rigidity of the body portion 2 in the vicinity of the inner side of the connecting portion 4 in the width direction is increased due to the presence of the absorbent core 22, so that the connecting portion 4 can be easily bent. becomes possible.

Next, a vertical folding curve F1 (indicated by a dashed line in FIG. 6) extending in the longitudinal direction is set between each leg-surrounding elastic member 27 and the central auxiliary seat 5. 2 is bent toward the center auxiliary sheet 5 side. As a result, the tape base portion 413 and the common base portion 42 are sandwiched between the side portion and the central portion of the body portion 2 . For example, the longitudinal folding line F1 overlaps the absorbent core 22 at the front portion 201 and the rear portion 203 and does not overlap the absorbent core 22 at the crotch portion 202 . In one example of manufacturing the absorbent article 1, a plurality of absorbent articles 1 are continuous in the vertical direction in FIG. and then cut and separated into individual absorbent articles 1 .

After that, as indicated by the dashed line in FIG. 1, two lateral bending curves extending in the width direction near the boundary between the front part 201 and the crotch part 202 and near the boundary between the crotch part 202 and the rear part 203 F2 are set respectively, and the absorbent article 1 is folded toward the inner surface (top sheet 21) along each horizontal folding curve F2. That is, the absorbent article 1 is folded into three along the two horizontal folding curves F2. As a result, the absorbent article 1 is folded. It should be noted that the lateral folding curve F2 does not overlap the connection portion 4. As shown in FIG.

FIG. 7 is a diagram showing a part of the absorbent article 1 with the elastic members 24 to 27, 35, and 52 contracted. The same applies to FIG. 9 described later). In the actual absorbent article 1, the contraction of the central elastic member 52 and the rear waist elastic member 25 (see FIG. 1) causes the rear end edge 207 of the body portion 2 to move downward (toward the absorbent core 22) in FIG. It will be in a curved state. Along with this, the second fastening tape 41 on the upper side (on the rear edge 207 side) in FIG.

Here, an absorbent article of a comparative example will be described. FIG. 8 is a diagram showing an absorbent article 9 of a comparative example. The absorbent article 9 of Comparative Example differs from the absorbent article 1 in that the distance D2 of the gap G2 between the rear end edge 227 of the absorbent core 22 and the rear waist elastic member 25 is sufficiently larger than 25 mm. In the absorbent article 9 of the comparative example, the length of the central elastic member 52 protruding from the rear end edge 227 of the absorbent core 22 is relatively large, and as shown in FIG. The rear end edge 207 of the body portion 2 is excessively curved. When the absorbent article is put on the wearer, the rear portion 203 of the body portion 2 is aligned with the waist circumference of the wearer, but the rear end edge 207 of the body portion 2 is greatly curved. With the absorbent article 9, it becomes difficult to align the absorbent article 9 when worn.

4, the distance D1 of the gap G1 between the rear edge 227 of the absorbent core 22 and the rear waist elastic member 25 is 25 mm or less, and the rear edge 227 of the absorbent core 22 is set to 25 mm or less. The length of the central elastic member 52 protruding from is also relatively small. This can prevent the rear edge 207 of the body portion 2 from being excessively curved when the absorbent article 1 is contracted. As a result, it becomes easy to align the absorbent article 1 when worn. In addition, in FIG. 7, the outer shape of the absorbent article 9 of the comparative example is indicated by a two-dot chain line.

In addition, in the absorbent article 9 of the comparative example in which the rear end edge 207 of the body portion 2 is excessively curved, as shown in FIG. It is arranged at a position deviated greatly inward in the width direction with respect to As a result, when the absorbent article 9 is folded, the vertical folding line F1 extending in the longitudinal direction overlaps a part of the connection portion 4, more specifically, the second fastening portion 412 of the second fastening tape 41. Unnecessary creases are formed in the portion where the second fastening portion 412 and the intermediate region 416 overlap.

When attaching the absorbent article to the wearer, the first fastening portion 411 is peeled off from the common base portion 42, and the second fastening portion 412 is peeled off from the intermediate region 416 (see FIG. 8). However, in the absorbent article 9 of the comparative example in which the unnecessary folds are formed, there are cases where the entire second fastening portion 412 is not used for fastening to the fastening portion 29 due to the influence of the folds. In this case, the fastening force between the connection portion 4 and the fastening portion 29 is reduced.

On the other hand, in the absorbent article 1 of FIG. 7, since the curvature of the rear end edge 207 of the main body portion 2 is reduced, the displacement amount of the second fastening tape 41 inward in the width direction with respect to the first fastening tape 41 is is smaller than that of the absorbent article 9 of the comparative example. As a result, when the absorbent article 1 is folded, the vertical folding line F1 extending in the longitudinal direction does not partially overlap the connecting portion 4 (that is, unnecessary folds are formed in the second fastening tape 41). Suppressed. As a result, it is possible to prevent the fastening force between the connecting portion 4 and the attached portion 29 from being lowered as in the absorbent article 9 of the comparative example.

By the way, when both ends of the rear waist elastic member 25 are positioned outside both ends of the rear end edge 227 of the absorbent core 22 in the width direction, the portion of the main body 2 outside the absorbent core 22 contracts, The displacement of the second fastening tape 41 inward in the width direction with respect to the first fastening tape 41 increases. In this case, unnecessary creases are likely to be formed in the second fastening tape 41 . Therefore, in order to further suppress the formation of unnecessary creases in the second fastening tape 41 , both ends of the rear waist elastic member 25 should be positioned inside the both ends of the rear edge 227 of the absorbent core 22 . is preferred. Note that depending on the design of the absorbent article 1 , both ends of the rear waist elastic member 25 may be positioned outside both ends of the rear edge 227 of the absorbent core 22 .

In the absorbent article 1 , the plurality of elastic elements 251 in the rear waist elastic member 25 are composed of first elastic elements 251 intersecting the central elastic member 52 and the first elastic elements 251 and the rear end edge 207 of the body portion 2 . and a second elastic element 251 disposed between and not crossing the central elastic member 52 . As a result, the length between the rear end of the central elastic member 52 and the rear end edge 227 of the absorbent core 22 (that is, the range in which the main body 2 shrinks in the longitudinal direction behind the rear end edge 227 of the absorbent core 22) ) can be made smaller, and the rear end edge 207 of the main body 2 can be further suppressed from being excessively curved.

As shown in FIG. 6, leg-surrounding elastic members 27 are provided on the outside in the width direction with respect to the vertical folding line F1 extending in the longitudinal direction. Since both side portions of the body portion 2 are also contracted in the longitudinal direction by the leg-surrounding elastic members 27, the bending of the rear end edge 207 of the body portion 2 can be further suppressed. In the absorbent article 1 of FIG. 1, the core side elastic member 26 also contributes to suppressing the bending of the rear end edge 207 for the same reason.

In the absorbent article 1, the central elastic member 52 does not cross the front waist elastic member 24 when the main body 2 is viewed from above. This can prevent the front edge 206 of the main body 2 from being excessively curved.

Various modifications of the absorbent article 1 are possible.

Depending on the design of the absorbent article 1, the absorbent core 22 and a part of the rear waist elastic member 25 may overlap, and the distance D1 of the gap G1 between the rear edge 227 of the absorbent core 22 and the rear waist elastic member 25 (Fig. 4) may be set to 0 (that is, the gap G1 may not exist). On the other hand, from the viewpoint of appropriately utilizing the contractile force of the rear waist elastic member 25, it is preferable that the absorbent core 22 and the rear waist elastic member 25 do not overlap, that is, the distance D1 of the gap G1 is greater than zero.

In the absorbent article 1, the central auxiliary sheet 5 may be omitted and the central elastic member 52 may be provided in the body portion 2. In this case, the central elastic member 52 is provided, for example, between the top sheet 21 and the absorbent core 22 or between the absorbent core 22 and the back sheet 23 . Also, the central elastic member 52 may be omitted from the front portion 201 and the central elastic member 52 may be provided from the crotch portion 202 to the rear portion 203 . In this case also, the central elastic member 52 intersects the rear waist elastic member 25 so that the rear portion 203 can be brought into close contact with the wearer's skin. As described above, it is sufficient that the central elastic member 52 is provided at least from the crotch portion 202 to the rear portion 203 in the body portion 2 .

In the absorbent article 1, a waist elastic member extending in the width direction is provided between the front waist elastic member 24 and the rear waist elastic member 25 and the crotch part 202 (see waist elastic member 28 in FIG. 10 to be described later). Body-fitting gathers may be formed. In principle, the contractile force of the waist elastic member (the contractile force per unit width in the direction perpendicular to the longitudinal direction of the elastic member) is smaller than the contractile force of the front waist elastic member 24 and the rear waist elastic member 25 .

The first fastening portion 411 and the second fastening portion 412 are adhesive layers formed of an adhesive material on the tape base portion 413 made of nonwoven fabric, and the fastening portion 29 or the fastening portion 29 is omitted. The outer surface of the front part 201 may be a plastic film or the like to which the adhesive layer can adhere. Also in this case, each connecting portion 4 can be attached to and detached from the outer surface of the front portion 201 . Moreover, only one fastening tape 41 may be provided in each connecting portion 4 , or only one fastening portion may be provided in each fastening tape 41 .

The above method for suppressing excessive bending of the rear edge 207 of the main body 2 is adopted in a pants-type disposable diaper in which both sides of the front part 201 and both sides of the rear part 203 are joined in advance. may be FIG. 10 shows the unfolded state of the pants-type absorbent article 1a. In the absorbent article 1a, the body portion 2 includes an exterior sheet 20 and a substantially sheet-like absorbent body 220. As shown in FIG. The absorbent body 220 includes the absorbent core 22 and is provided on the wearer-side surface of the exterior sheet 20 . In the pants-type absorbent article 1a, the vertical direction in FIG. 10 showing the unfolded state is the longitudinal direction of the main body 2, and both the exterior sheet 20 and the absorbent body 220 extend in the longitudinal direction. The body portion 2 of the absorbent article 1a is also a longitudinally extending sheet member provided with an absorbent core 22, similar to the body portion 2 of the absorbent article 1 of FIG. It has a rear part 203 in order in the longitudinal direction. In the absorbent article 1a, both sides of the outer sheet 20 in the front part 201 and both sides of the outer sheet 20 in the rear part 203 are joined together, a body opening is provided at the upper end, and a pair of leg openings are provided at the lower part. is provided.

In the front portion 201 , a front waist elastic member 24 extending in the width direction substantially perpendicular to the longitudinal direction is provided along the front end edge 206 of the body portion 2 . In the rear portion 203 , a rear waist elastic member 25 extending in the width direction is provided along the rear end edge 207 of the body portion 2 . In the crotch portion 202 , a pair of leg elastic members 27 are provided along both side edges of the body portion 2 . Waist elastic members 28 extending in the width direction are provided between the front waist elastic member 24 and the leg elastic members 27 and between the rear waist elastic member 25 and the leg elastic members 27 in the longitudinal direction.

A pair of side sheets 3 extending in the longitudinal direction are provided on both sides of the absorber 220 , and a central auxiliary sheet 5 extending in the longitudinal direction is provided between the pair of side sheets 3 . The central elastic member 52 of the central auxiliary seat 5 is provided from the front portion 201 to the rear portion 203 . When the absorbent article 1a is viewed from above (that is, when the absorbent article 1a in the unfolded state as shown in FIG. 10 is viewed along the thickness direction), the central elastic member 52 is absorbed at the crotch portion 202. It overlaps the core 22 and crosses the rear waist elastic member 25 at the rear portion 203 . Also in the absorbent article 1a, the distance between the rear end edge 227 of the absorbent core 22 located in the rear portion 203 and the rear waist elastic member 25 is 25 mm or less when the body portion 2 is stretched in the longitudinal direction. is. This can prevent the rear edge 207 of the main body 2 from being excessively curved when the absorbent article 1a is contracted.

The configurations in the above embodiment and each modified example may be combined as appropriate as long as they do not contradict each other.

Reference Signs List 1, 1a Absorbent article 2 Main body 4 Connecting part 22 Absorbent core 24 Front waist elastic member 25 Rear waist elastic member 41 Fastening tape 52 Central elastic member 201 Front part 202 Crotch part 203 Rear part 206 Front edge (of main body part) 207 rear edge (of main body) 227 rear edge (of absorbent core) 251 elastic elements (of rear waist elastic member) C1, C2 center line (of fastening tape) G1 gap

Claims (8)

An absorbent article,
a body portion, which is a longitudinally extending sheet member provided with an absorbent core and having a front portion, a crotch portion and a rear portion in order in the longitudinal direction;
a pair of side sheets spaced apart in a width direction substantially perpendicular to the longitudinal direction on the main body;
a central auxiliary sheet fixed to the wearer side of the main body portion between the pair of side sheets and extending in the longitudinal direction;
a rear waist elastic member provided along the rear edge of the main body in the rear portion, extending in the width direction, and not overlapping the absorbent core when the main body is viewed from above ;
Provided on the central auxiliary seat from at least the crotch portion to the rear portion, when the main body portion is viewed in plan, the crotch portion overlaps with the absorbent core, and the rear portion intersects with the rear waist elastic member. a central elastic member for
with
The central auxiliary seat is
a fixing portion extending in the longitudinal direction and fixed to a central portion of the body portion in the width direction;
a pair of flap portions continuous to both outer sides of the fixed portion in the width direction and extending in the longitudinal direction together with the fixed portion;
with
Each flap portion is provided with an elastic element of the central elastic member, and when the central elastic member contracts, each flap portion rises toward the wearer side to form a central gather,
a distance of a gap between the rear edge of the absorbent core positioned at the rear portion and the rear waist elastic member is 25 mm or less when the main body portion is stretched in the longitudinal direction ;
the rear waist elastic member includes a plurality of elastic elements extending in the width direction,
The plurality of elastic elements are
a first elastic element crossing the central elastic member;
a second elastic element disposed between the first elastic element and the rear edge of the main body and not crossing the central elastic member;
An absorbent article comprising : An absorbent article,
a body portion, which is a longitudinally extending sheet member provided with an absorbent core and having a front portion, a crotch portion and a rear portion in order in the longitudinal direction;
a pair of side sheets spaced apart in a width direction substantially perpendicular to the longitudinal direction on the main body;
a central auxiliary sheet fixed to the wearer side of the main body portion between the pair of side sheets and extending in the longitudinal direction;
a rear waist elastic member provided along the rear edge of the main body in the rear portion, extending in the width direction, and not overlapping the absorbent core when the main body is viewed from above;
a front waist elastic member provided along the front end edge of the body portion in the front portion and extending in the width direction;
It is provided on the central auxiliary seat from the front portion to the rear portion, and when the main body portion is viewed in plan, overlaps the absorbent core at the crotch portion and intersects the rear waist elastic member at the rear portion. , a central elastic member that does not cross the front waist elastic member in the front portion;
with
The central auxiliary seat is
a fixing portion extending in the longitudinal direction and fixed to a central portion of the body portion in the width direction;
a pair of flap portions continuous to both outer sides of the fixed portion in the width direction and extending in the longitudinal direction together with the fixed portion;
with
Each flap portion is provided with an elastic element of the central elastic member, and when the central elastic member contracts, each flap portion rises toward the wearer side to form a central gather,
The distance between the rear end edge of the absorbent core positioned at the rear portion and the rear waist elastic member is 25 mm or less when the body portion is stretched in the longitudinal direction. absorbent article. The absorbent article according to claim 1 or 2 ,
The absorber further comprising a pair of connecting portions that are attached to both sides of the rear portion and fastened to the outer surface of the front portion to connect the both sides of the rear portion to the front portion. sexual goods. The absorbent article according to claim 3 ,
Each connection
a first fastening tape extending in the width direction;
a second fastening tape disposed between the first fastening tape and the rear edge of the main body and extending in the width direction;
An absorbent article comprising: The absorbent article according to claim 4 ,
With respect to the longitudinal direction, the rear edge of the absorbent core is positioned between the center line of the second fastening tape extending in the width direction and the rear edge of the main body. absorbent article. The absorbent article according to any one of claims 1 to 5 ,
An absorbent article, wherein the elongation rate of the central elastic member when joined to the main body is 1.7 times or less. The absorbent article according to any one of claims 1 to 6 ,
In the absorbent core, the width of the rear portion in the width direction is larger than the width of the crotch portion. The absorbent article according to any one of claims 1 to 7 ,
The absorbent article, wherein both ends of the rear waist elastic member are located inside both ends of the rear edge of the absorbent core in the width direction.

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