JP2021146090A - Absorbent article - Google Patents

Abstract

To inhibit a rear end edge of a body part from being excessively curved.SOLUTION: A body part 2 of an absorbent article 1 is a sheet member provided with an absorbent core 22 and extending in a longitudinal direction, and has a front part, a crotch part, and a rear part 203 in order in the longitudinal direction. A rear waist elastic member 25 extending in a width direction is provided in the rear part along a rear end edge 207 of the body part. A central elastic member 52 is provided in the body part at least from the crotch part to the rear part. When the body part is viewed in a plan view, the central elastic member overlaps the absorbent core in the crotch part and intersects the rear waist elastic member in the rear part. When the body part is extended in the longitudinal direction, a distance D1 of a gap G1 between a rear end edge 227 of the absorbent core located at the rear part and the rear waist elastic member is 25 mm or less. Thereby, it is possible to inhibit the rear end edge of the body part from being excessively curved in a state where the absorbent article is contracted.SELECTED DRAWING: Figure 4

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 lateral sides of the liquid absorbing structure, and a liquid absorbing elastic body extending in the vertical direction is provided at the central portion in the horizontal direction of the liquid absorbing structure. Be done. This prevents large wrinkles from occurring in the central portion. Further, in the absorbent article, by providing an inelastic region in which the leg elastic body and the liquid absorbing elastic body are not arranged in the rear waist region, it is possible to prevent large wrinkles from occurring in the rear waist region. In the absorbent article of Patent Document 2, an opening extending in the front-rear direction is formed in the central portion in the width direction of the absorption core, and a central elastic member extending in the front-rear direction overlapping with the absorption core is formed along the outer edges on both sides of the opening. Provided. In the absorbent article, the opening forms a shape in which the absorbent core is recessed in the width direction in the crotch of the wearer. Further, due to the presence of the central elastic member, even if urine or the like is absorbed by the absorption core, it is suppressed that the absorption core is greatly dented.

Japanese Unexamined Patent Publication No. 2014-79292 Japanese Unexamined Patent Publication No. 2017-51349

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 intersects the rear waist elastic member provided along the rear end edge of the main body portion. This makes it possible to bring the rear portion of the absorbent article into close contact with the wearer's skin. However, in this case, the contraction of the rear waist elastic member attracts the portion of the main body near the rear end edge to the center in the width direction, and the contraction of the central elastic member attracts the portion to the absorption core side. As a result, in the state where the absorbent article is contracted, the rear end edge of the main body portion is greatly curved toward the absorbent core side, and the appearance of the absorbent article is deteriorated. Further, when the absorbent article is a tape type disposable diaper, when the absorbent article is attached to the wearer, the rear part of the main body is aligned with respect to the wearer's waist, but the rear end edge. In an absorbent article having a large curvature, it becomes difficult to align the absorbent article at the time of mounting.

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

The invention according to claim 1 is an absorbent article, which is a seat member extending in the longitudinal direction provided with an absorbing core, and a main body portion having a front portion, a crotch portion, and a rear portion in this order in the longitudinal direction. A rear waist elastic member provided along the rear end edge of the main body portion in the rear portion and extending in a width direction substantially perpendicular to the longitudinal direction, and at least from the crotch portion to the rear portion in the main body portion. Provided, when the main body portion is viewed in a plan view, the crotch portion is provided with a central elastic member that overlaps with the absorption core and intersects with the rear waist elastic member at the rear portion, and the main body portion is provided in the longitudinal direction. In the stretched state, the distance between the rear end edge of the absorption core located at the rear portion and the rear waist elastic member is 25 mm or less.

The invention according to claim 2 is the absorbent article according to claim 1, wherein the absorbable article is attached to both side portions of the rear portion and is fastened to the outer surface of the front portion, whereby the said rear portion. A pair of connecting portions for connecting both side portions to the front portion is further provided.

The invention according to claim 3 is the absorbent article according to claim 2, wherein each connection portion includes a first fastening tape extending in the width direction, the first fastening tape, and the main body portion. It is provided with a second fastening tape that is arranged between the rear end edge and extends in the width direction.

The invention according to claim 4 is the absorbent article according to claim 3, wherein the rear end edge of the absorption core extends in the width direction of the second fastening tape in the longitudinal direction. It is located between the wire and the trailing edge of the body.

The invention according to claim 5 is the absorbent article according to any one of claims 1 to 4, wherein the elongation rate of the central elastic member at the time of joining to the main body portion is 1.7 times. It is as follows.

The invention according to claim 6 is the absorbent article according to any one of claims 1 to 5, wherein the rear waist elastic member includes a plurality of elastic elements extending in the width direction. The second elastic element is arranged between the first elastic element that intersects the central elastic member and the rear end edge of the first elastic element and the main body portion, and does not intersect the central elastic member. And include.

The invention according to claim 7 is the absorbent article according to any one of claims 1 to 6, which is provided in the front portion along the front end edge of the main body portion and extends in the width direction. A front waist elastic member is further provided, and the central elastic member is provided from the front portion to the rear portion, and the central elastic member does not intersect with the front waist elastic member when the main body portion is viewed in a plan view.

The invention according to claim 8 is the absorbent article according to any one of claims 1 to 7, wherein in the absorption core, the width in the width direction at the rear portion is the width at the crotch portion. Greater than.

The invention according to claim 9 is the absorbent article according to any one of claims 1 to 8, wherein both ends of the rear waist elastic member are the rear ends of the absorption core in the width direction. Located inside the edges.

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

It is a top view which shows the absorbent article. It is sectional drawing which shows the absorbent article. It is a perspective view which shows the absorbent article. It is a figure which shows the vicinity of the connection part in an enlarged manner. It is a figure for demonstrating the state in which the absorbent article is folded. It is a figure for demonstrating the state in which the absorbent article is folded. It is a figure for demonstrating the curvature of the rear end edge of a main body part. It is a figure which shows the absorbent article of the comparative example. It is a figure for demonstrating the curvature of the rear end edge of the main body part in the absorbent article of a comparative example. It is a figure which shows another example of an absorbent article.

FIG. 1 is a plan view showing an absorbent article 1 according to an embodiment of the present invention in an unfolded state. The absorbent article 1 is a tape-type disposable diaper in which a portion that contacts the wearer's ventral side and a portion that contacts the dorsal side are connected around the waist by a pair of connecting portions 4. The absorbent article 1 receives excrement from the wearer. In FIG. 1, the absorbent article 1 is drawn with the surface on the side that comes into contact with the wearer (that is, the wearer side) at the time of wearing as the front.

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

As shown in FIGS. 1 and 2, the absorbent article 1 includes a main body 2 which is a seat member extending in the longitudinal direction, a pair of side seats 3, and a central auxiliary seat 5. The pair of side seats 3 extend in the longitudinal direction of the main body 2 on both side portions 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 in the longitudinal direction between the pair of side seats 3 on the main body 2. In the example shown in FIG. 1, the pair of side seats 3 and the central auxiliary seat 5 are provided over approximately the entire length of the main body 2 in the longitudinal direction. Details of the side seat 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 referred to as a “central portion”. The central portion of the main body portion 2 is a band-shaped portion extending in the longitudinal direction over approximately the entire length of the main body portion 2 at the center in the width direction.

The lower portion 201 and the upper portion 203 of the main body 2 in FIG. 1 come into contact with the skin on the ventral and dorsal sides of the wearer, respectively. In the following description, the parts 201 and 203 will be referred to as "front part 201" and "rear part 203", respectively. Further, a portion 202 continuous from the front portion 201 and the rear portion 203 between the front portion 201 and the rear portion 203 is referred to as a “crotch lower portion 202”. The inseam 202 faces the wearer's crotch. In the absorbent article 1, the main body 2 has a front portion 201, a crotch portion 202, and a rear portion 203 in this order in the longitudinal direction. In the example shown in FIG. 1, the width of the front portion 201 and the rear portion 203 in the width direction (hereinafter, also simply referred to as “width”) is larger than the width of the inseam 202. That is, in a plan view, the absorbent article 1 is a so-called hourglass type.

A landing portion 29 (see FIG. 3) is provided on the outer surface of the front portion 201 opposite to the wearer. The fastening portion 29 is a loop member of the hook-and-loop fastener, and is joined 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. The pair of connecting portions 4 are attached to both side portions of the rear portion 203. A fastening portion 410, which will be described later, is provided on the inner surface (the surface on the wearer side) of the pair of connecting portions 4. 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 connection unit 4 will be described later.

When the absorbent article 1 is attached to the wearer, a pair of the front portion 201 and the rear portion 203 of the main body portion 2 are brought into contact with the ventral side and the dorsal side of the wearer, respectively, as shown in FIG. The connecting portion 4 of the above is anchored to the outer surface of the front portion 201, more specifically, to the anchored portion 29. As a result, both side portions of the rear portion 203 are connected to the front portion 201 (typically, both side portions of the front portion 201).

As shown in FIGS. 1 and 2, the main body 2 includes a top sheet 21, an absorption core 22, and a back sheet 23. The top sheet 21 is a liquid-permeable sheet member. The back sheet 23 is a liquid-repellent or impermeable sheet member. The absorption 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 absorption core 22 on the wearer side is covered with the top sheet 21. The other main surface of the absorption 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 absorption core 22 is drawn by a thick broken line in order to facilitate the understanding of the figure.

In the example shown in FIG. 1, the edges of both ends of the absorption core 22 in the longitudinal direction extend substantially straight in the width direction along the edges of both ends of the main body 2. In the following description, among these edges, the edge located at the front portion 201 is referred to as the “front end edge”, and the edge located at the rear portion 203 is referred to as the “rear end edge”. In the longitudinal direction, the front end edge 226 of the absorption core 22 is separated from the front end edge 206 of the main body 2, and the rear end edge 227 of the absorption core 22 is also separated from the rear end edge 207 of the main body 2.

The width of the absorption core 22 in the front portion 201 and the rear portion 203 is larger than the width of the absorption core 22 in the crotch portion 202. In other words, the absorption core 22 is a so-called hourglass type in a plan view. Further, the absorption 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 arranged between the front end edge 226 and the rear end edge 227 of the absorption core 22 at positions separated from each other. The shape of the absorption core 22 may be arbitrarily changed, and the opening 221 may be omitted.

The top sheet 21 is fixed to the back sheet 23 around the absorption core 22. The fixing of the top sheet 21 and the back sheet 23 is performed, for example, via a hot melt adhesive. The top sheet 21 and the back sheet 23 may be fixed by heat 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 top sheet 21 quickly captures the water content of the excrement from the wearer and moves the water content to the absorption core 22. The absorption core 22 absorbs and fixes the water that has permeated the top sheet 21 (that is, the water of excrement from the wearer). The back sheet 23 prevents the water of the excrement that has reached the back sheet 23 from seeping out to the outside 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 the front end edge 206. The front waist elastic member 24 is joined between the top sheet 21 and the back sheet 23 in an stretched state by, for example, 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 a plurality of elastic elements 241. Further, the length of the front waist elastic member 24 is shorter than the length of the front end edge 226 of the absorption core 22. In the width direction, both ends of the front waist elastic member 24 are located inside both ends of the front end edge 226 of the absorption core 22. Both ends of the front waist elastic member 24 are both ends of a portion that exerts a contraction force on the main body 2. The same applies to the rear waist elastic member 25 described later.

The rear portion 203 is provided with a rear waist elastic member 25 extending in the width direction along the rear end edge 207. The rear waist elastic member 25 is joined between the top sheet 21 and the back sheet 23 in an stretched state by, for example, a hot melt adhesive or the like. 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 back waist elastic member 25 includes a plurality of elastic elements 251. Further, the length of the rear waist elastic member 25 is shorter than the length of the rear end edge 227 of the absorption core 22. In the width direction, both ends of the rear waist elastic member 25 are located inside the both ends of the rear end edge 227 of the absorption core 22. In the absorbent article 1, waist gathers are formed by contracting the front waist elastic member 24 and the rear waist elastic member 25, and the main body 2 comes into close contact with the wearer's waist when the absorbent article 1 is worn.

In the main body 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 (that is, the portion between the pair of side seats 3) in the width direction. The pair of core side elastic members 26 are arranged in the vicinity of both side portions of the absorption core 22, and are joined to the main body portion 2 in a stretched state by a hot melt adhesive or the like. Each core side elastic member 26 includes at least one elastic element extending in the longitudinal direction. In the example of FIG. 1, one end of the core side elastic member 26 in the longitudinal direction is located near the boundary between the front portion 201 and the crotch portion 202. The other end of the core side elastic member 26 overlaps with the absorption core 22 at the rear portion 203, and is arranged at a position away from the rear end edge 227 of the absorption core 22 toward the crotch portion 202. In the absorbent article 1, both side portions of the absorbent core 22 are lifted toward the wearer side by contracting the pair of core side elastic members 26. In the present specification, the expression that two members overlap is the thickness direction of the absorbent article 1 when the absorbent article 1 is viewed in a plan view (that is, the absorbent article 1 is spread in the longitudinal direction and the width direction as shown in FIG. 1). (When viewed along), it means that both members overlap. The same is true in the expression that two members intersect.

A pair of elastic members around the legs extending in the longitudinal direction are provided on both sides of the main body 2. The pair of elastic members around the legs 27 are arranged outside the absorption core 22 in the width direction, and are joined to the main body 2 in a stretched state by a hot melt adhesive or the like. Each leg circumference elastic member 27 includes at least one elastic element extending in the longitudinal direction. In the example of FIG. 1, one end of the leg circumference elastic member 27 in the longitudinal direction is located 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 absorption core 22 toward the crotch portion 202 in the longitudinal direction. Typically, the leg elastic member 27 does not overlap the absorption core 22. As the elastic member 27 around the legs contracts, the fixing portion 33 and the back seat 23 described later of the side seat 3 stand up toward the wearer side, and leg gathers are formed in close contact with the vicinity of the base of the wearer's legs.

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

Each of the pair of side sheets 3 includes a liquid-repellent or impermeable side sheet main body 31 and a side wall elastic member 35. The side seat main body 31 includes a fixing portion 33 and a side wall portion 34. The fixing portion 33 is fixed on the side portion of the top sheet 21 and on the side portion extending outward in the width direction from the top sheet 21 of the back sheet 23. 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 heat bonding, ultrasonic bonding, or the like.

The side wall portion 34 is continuous inward 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 in the vicinity of both side portions of the absorbing core 22. A side wall elastic member 35 extending in the longitudinal direction is joined to an end portion of each side wall portion 34, that is, a free end, in a stretched state by a hot melt adhesive or the like. The side wall elastic member 35 includes at least one elastic element extending in the longitudinal direction. As the side wall elastic member 35 contracts, the side wall portion 34 rises toward the wearer, and three-dimensional gathers are formed. In FIG. 2, the side wall elastic member 35 is joined to the single-layer side sheet main body 31, but the side sheet main body 31 is a laminated body of a plurality of sheets, and the side sheet main bodies 31 are adjacent to each other. A side wall elastic member 35 may be arranged between them. The same applies to the auxiliary seat main body 51 and the central elastic member 52 described later in the central auxiliary seat 5.

As shown in FIG. 2, the central auxiliary sheet 5 includes a liquid-repellent or impermeable auxiliary sheet main body 51 and a central elastic member 52. The auxiliary sheet main body 51 includes one fixing portion 53 and a pair of flap portions 54. The fixing portion 53 extends in the longitudinal direction and is fixed to the top sheet 21 at the central portion of the main body portion 2. The fixing portion 53 and the top sheet 21 are fixed via an adhesive such as a hot melt adhesive. The fixing portion 53 and the top sheet 21 may be fixed by heat 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 fixing 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 both ends is not fixed to the top sheet 21. It is preferable that each end portion fixed to the top sheet 21 in the flap portion 54 overlaps the end portion of the absorption 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 elastic element 521 extending in the longitudinal direction, and is joined to the auxiliary sheet main body 51 in a stretched state by a hot melt adhesive or the like. In the example of FIG. 1, the central elastic member 52 includes a plurality of elastic elements 521. The elongation rate of the central elastic member 52 at the time of joining to the main body 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 contraction force of the central elastic member 52 (the contraction 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 member. 26, It is smaller than any of the contraction forces of the leg circumference 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 a plan view, the central elastic member 52 overlaps with the absorbing core 22 at each of the front portion 201, the crotch portion 202, and the rear portion 203. In the example of FIG. 1, one end (front end) of the central elastic member 52 in the longitudinal direction is located near the front end edge 226 of the absorption core 22. The central elastic member 52 does not intersect 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 absorption core 22 and the rear end edge 207 of the main body 2. As shown in FIG. 4, the central elastic member 52 intersects the elastic element 251 on the most absorbing core 22 side of the rear waist elastic member 25, and does not intersect the elastic element 251 on the rear end edge 207 side of the main body 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 member 25.

As shown in FIG. 2, a part of the elastic elements 521 out of the plurality of elastic elements 521 is arranged in the fixing portion 53, and the remaining elastic elements 521 are arranged in the flap portion 54. It is preferable that the elastic elements 521 arranged in the fixed portion 53 are arranged on both outer sides of the opening 221 of the absorption core 22 in the width direction and do not overlap with the opening 221. Further, it is preferable that each flap portion 54 is provided with two or more elastic elements 521. In the absorbent article 1, the flap portion 54 rises toward the wearer side due to the contraction of the central elastic member 52, and the central gather is formed. Further, when the central elastic member 52 intersects with the rear waist elastic member 25, the rear portion 203 of the main body portion 2 can be brought into close contact with the wearer's skin.

For example, when the auxiliary absorber (inner pad) is attached on the inner surface of the absorbent article 1 and the absorbent article 1 is used as an exterior article (so-called outer), the auxiliary absorber can be lifted toward the wearer by the central gather. It becomes. Further, even when the auxiliary absorber is not used, in a state where the water such as urine excreted from the wearer is absorbed by the absorption core 22, the absorption core 22 is greatly depressed so as to be separated from the wearer's crotch due to its weight. Peeing can be suppressed by the central elastic member 52 (particularly, the elastic element 521 provided in the fixing portion 53).

Here, attention is paid to the gap G1 between the rear end edge 227 of the absorption 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 (distance D1 at the position of the central elastic member 52) is 25 mm or less in the state where the main body 2 is extended in the longitudinal direction. In the preferred absorbent article 1, the distance D1 of the gap G1 is smaller than the distance (see FIG. 1) between the front end edge 226 of the absorption core 22 and the front waist elastic member 24, for example, the distance 3 of the gap. It is less than / 4th. As will be described later, when the distance D1 of the gap G1 is small, it is possible to prevent the rear end edge 207 of the main body 2 from being excessively curved. In order to further suppress the curvature 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 absorption core 22 includes, for example, at least one of a granular or fibrous highly absorbent material and an aggregate of hydrophilic fibers as an absorbent material. As the highly absorbent material, for example, a granular super absorbent polymer (SAP (Super Absorbent Polymer)) or a fibrous super absorbent fiber (SAF (Super Absorbent Fiber)) is used. The aggregate of the hydrophilic fibers is formed of, for example, crushed pulp fibers or cellulose fibers. In the present embodiment, the absorption core 22 is formed by wrapping the above-mentioned aggregate of hydrophilic fibers mixed with granular SAP with tissue paper, a liquid-permeable non-woven fabric, or the like. This makes it possible to prevent the aggregate of hydrophilic fibers from losing its shape and the SAP from falling off (particularly, falling off after absorbing liquid). The front end edge 226 and the rear end edge 227 of the absorption core 22 are the edge of the region where the highly absorbent material exists or the edge of the aggregate of hydrophilic fibers, and are the highly absorbent material or the hydrophilic fiber. It is not an edge such as a non-woven fabric that wraps the aggregate of.

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

The backsheet 23 is, for example, a liquid-impermeable or liquid-repellent non-woven fabric (spunbond non-woven fabric, melt-blow non-woven fabric, SMS (spun-bond, melt-blow, spun-bond) non-woven fabric, etc.) formed of hydrophobic fibers, or impermeable. Formed from a liquid or liquid repellent plastic film. The back sheet 23 may be a laminate of the non-woven fabric and the plastic film. When a plastic film is used for the back sheet 23, a breathable (that is, breathable) plastic film is used from the viewpoint of preventing stuffiness of the absorbent article 1 and improving the comfort of the wearer. Is preferable.

The side sheet main body 31 and the auxiliary sheet main body 51 are, for example, impermeable or liquid-repellent non-woven fabrics (air-through non-woven fabrics, point-bonded non-woven fabrics, spunbonded non-woven fabrics, melt-blown non-woven fabrics, SMS non-woven fabrics, etc.) formed of hydrophobic fibers. Is formed by. As the elastic elements of the elastic members 24 to 27, 35, 52, for example, polyurethane yarn, strip-shaped polyurethane film, thread-shaped or strip-shaped natural rubber, or the like is used. In this embodiment, the polyurethane yarn is used as an elastic element.

As shown in FIG. 4, each connecting portion 4 includes two fastening tapes 41 and one common base portion 42. The two fastening 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 42 is substantially rectangular and is located on the main body 2 side of the two fastening tapes 41. The structures and shapes of the two fastening tapes 41 are almost the same.

Each fastening tape 41 includes a tape base 413 and a fastening portion 410. The tape base 413 has a tape shape (strip shape) 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, parallel diagonal lines are provided on the first fastening portion 411 and the second fastening portion 412 for easy 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 (the front surface 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 end side (opposite side of the main body portion 2) of the tape base portion 413, and the second fastening portion 412 is provided on the root side of the tape base portion 413. On the inner surface of the tape base portion 413, an intermediate region 416 in which no fastening portion does not exist is provided between the first fastening portion 411 and the second fastening portion 412. 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 which is an assembly of a large number of fine hook elements.

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

As described above, the anchored portion 29 (see FIG. 3) of the front portion 201 is a loop member of the hook-and-loop fastener, and has a fine loop structure which is a set of a large number of fine loop elements. The fine hook structures of the first fastening portion 411 and the second fastening portion 412 can be engaged with each other with the fine loop structure of the anchored portion 29. That is, the fastening portion 410 of the fastening tape 41 can be fastened to the anchored portion 29. As described above, in the absorbent article 1, the fastening portions 410 of each fastening tape 41 are fastened to the fastening portion 29, so that both side portions of the rear portion 203 are connected to the front portion 201. NS.

Here, in each connection portion 4, the lower fastening tape 41 in FIG. 4 is referred to as a "first fastening tape 41", and the upper fastening tape 41 is referred to as a "second fastening tape 41". In the longitudinal direction, the second fastening tape 41 is arranged between the first fastening tape 41 and the rear end edge 207 of the main body 2. Assuming that the center lines C1 and C2 extending in the width direction are assumed in the first fastening tape 41 and the second fastening tape 41, both the center lines C1 and C2 intersect with the absorption core 22. Further, in the longitudinal direction, the rear end edge 227 of the absorption core 22 is located between the center line C2 of the second fastening tape 41 and the rear end edge 207 of the main body 2. Therefore, when the pair of connecting portions 4 are anchored to the anchored portion 29, the portion of the absorption core 22 in the vicinity of the rear end edge 227 is firmly brought into contact with the skin on the back side of the wearer, and the portion is brought into contact with the skin on the back side of the wearer. Leakage of excrement can be suppressed.

Further, in the absorbent article 1, as the distance D1 of the gap G1 between the rear end edge 227 of the absorbing core 22 and the rear waist elastic member 25 is reduced (25 mm or less), the second fastening tape is used. The distance between the center line C2 of 41 and the rear end edge 207 of the main body 2 is also relatively small. As a result, the absorbent article 1 can be attached to 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 housed in a predetermined packaging bag in a folded state. In one example, each fastening tape 41 is bent inward as shown in FIG. 5, with the edge of the second fastening portion 412 on the first fastening portion 411 side as a folding curve. 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. At the time of manufacturing the absorbent article 1, the connecting portion 4 may be joined to the main body portion 2 in a state where each fastening tape 41 is bent in advance toward the inner surface side as shown in FIG.

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

Next, a vertical folding curve F1 (indicated by a alternate long and short dash line in FIG. 6) extending in the longitudinal direction is set between the elastic member 27 around each leg and the central auxiliary sheet 5, and the main body portion is set along the vertical folding curve F1. The side portion of 2 is bent toward the central auxiliary sheet 5. 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 main body portion 2. The vertical bending curve F1 overlaps with the absorption core 22 at the front portion 201 and the rear portion 203, and does not overlap with the absorption core 22 at the crotch portion 202, for example. In an example of manufacturing the absorbent article 1, the main body 2 is bent along the vertical bending curve F1 (see FIG. 6) in a state where the plurality of absorbent articles 1 are continuous and stretched in the vertical direction in FIG. And then cut into separate absorbent articles 1.

After that, as shown by the alternate long and short dash line in FIG. 1, two transverse curve curves extending in the width direction in the vicinity of the boundary between the front portion 201 and the crotch portion 202 and in the vicinity of the boundary between the crotch portion 202 and the rear portion 203. F2 is set respectively, and the absorbent article 1 is bent toward the inner surface (top sheet 21) at each horizontal folding curve F2. That is, the absorbent article 1 is folded in three along the two horizontal folding curves F2. As a result, the absorbent article 1 is in a folded state. The horizontal turn curve F2 does not overlap with the connecting portion 4.

FIG. 7 is a diagram showing a part of the absorbent article 1 in a state where the elastic members 24 to 27, 35, 52 are contracted, and for convenience of illustration, only the outer shape of the main body 2 and the connecting portion 4 are shown (for convenience of illustration). The same applies to FIG. 9 described later). In the actual absorbent article 1, the rear end edge 207 of the main body 2 is moved to the lower side (absorption core 22 side) in FIG. 7 due to the contraction of the central elastic member 52 and the rear waist elastic member 25 (see FIG. 1). It becomes a curved state toward it. Along with this, the second fastening tape 41 on the upper side (rear end edge 207 side) in FIG. 7 is arranged at a position shifted inward in the width direction with respect to the first fastening tape 41 on the lower side.

Here, the absorbent article of the comparative example will be described. FIG. 8 is a diagram showing an absorbent article 9 of a comparative example. The absorbent article 9 of the comparative example is different from the absorbent article 1 in that the distance D2 of the gap G2 between the rear end edge 227 of the absorbing core 22 and the back 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 absorbing core 22 is relatively large, and as shown in FIG. 9, the absorbent article 9 is in a contracted state. The rear end edge 207 of the main body 2 is excessively curved. Absorption of a comparative example in which the rear portion 203 of the main body 2 is aligned with respect to the wearer's waist when the absorbent article is attached to the wearer, but the rear end edge 207 of the main body 2 is greatly curved. In the sex article 9, it becomes difficult to align the absorbent article 9 at the time of wearing.

On the other hand, in the absorbent article 1 of FIG. 4, the distance D1 of the gap G1 between the rear end edge 227 of the absorption core 22 and the rear waist elastic member 25 is 25 mm or less, and the rear end edge 227 of the absorption core 22 is set. The length of the central elastic member 52 protruding from is also relatively small. As a result, it is possible to prevent the rear end edge 207 of the main body 2 from being excessively curved when the absorbent article 1 is contracted. As a result, the position of the absorbent article 1 at the time of mounting becomes easy. In FIG. 7, the outer shape of the absorbent article 9 of the comparative example is shown by a chain double-dashed line.

Further, in the absorbent article 9 of the comparative example in which the rear end edge 207 of the main body 2 is excessively curved, as shown in FIG. 9, the upper second fastening tape 41 is the lower first fastening tape 41. It is placed at a position that is significantly offset inward in the width direction. As a result, in the folded state of the absorbent article 9, the longitudinal curve F1 extending in the longitudinal direction overlaps a part of the connecting portion 4, more specifically, the second fastening portion 412 of the second fastening tape 41, and the second 2 Unnecessary creases are formed in the portion where the fastening portion 412 and the intermediate region 416 overlap.

When the absorbent article is attached to the wearer, the first fastening portion 411 is peeled off from the common base 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 above unnecessary crease is formed, the entire second fastening portion 412 may not be used for fastening with the anchored portion 29 due to the influence of the crease. In this case, the fastening force between the connecting 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 2 is reduced, the amount of deviation of the second fastening tape 41 inward with respect to the first fastening tape 41 in the width direction is reduced. However, it is smaller than that of the absorbent article 9 of the comparative example. As a result, in the folded state of the absorbent article 1, the longitudinal curve F1 extending in the longitudinal direction may overlap a part of the connecting portion 4 (that is, an unnecessary crease is formed in the second fastening tape 41). It is suppressed. As a result, it is possible to suppress a decrease in the fastening force between the connecting portion 4 and the anchored portion 29 as in the absorbent article 9 of the comparative example.

By the way, in the width direction, when both ends of the rear waist elastic member 25 are located outside both ends of the rear end edge 227 of the absorption core 22, the portion outside the absorption core 22 in the main body 2 contracts. The amount of deviation of the second fastening tape 41 inward in the width direction with respect to the first fastening tape 41 becomes large. In this case, unnecessary creases are likely to be formed on 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 located inside the both ends of the rear end edge 227 of the absorption core 22. Is preferable. Depending on the design of the absorbent article 1, both ends of the rear waist elastic member 25 may be located outside the both ends of the rear end edge 227 of the absorbing core 22.

In the absorbent article 1, the plurality of elastic elements 251 in the rear waist elastic member 25 intersect the central elastic member 52 with the first elastic element 251 and the first elastic element 251 and the rear end edge 207 of the main body 2. It includes a second elastic element 251 that is disposed between and does not intersect 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 absorption core 22 (that is, the range in which the main body 2 contracts in the longitudinal direction behind the rear end edge 227 of the absorption core 22). ) Can be reduced to further prevent the rear end edge 207 of the main body 2 from being excessively curved.

As shown in FIG. 6, the leg circumference elastic member 27 is provided on the outer side in the width direction with respect to the vertical folding curve F1 extending in the longitudinal direction. Since both side portions of the main body portion 2 are also contracted in the longitudinal direction by the elastic member 27 around the legs, the curvature of the rear end edge 207 of the main body portion 2 can be further suppressed. In the absorbent article 1 of FIG. 1, the core side elastic member 26 also contributes to the suppression of the curvature of the rear end edge 207 for the same reason.

In the absorbent article 1, the central elastic member 52 does not intersect with the front waist elastic member 24 when the main body 2 is viewed in a plan view. As a result, it is possible to prevent the front end edge 206 of the main body 2 from being excessively curved.

The absorbent article 1 can be variously modified.

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 end edge 227 of the absorbent core 22 and the rear waist elastic member 25 (FIG. (See 4) may be 0 (that is, the gap G1 may not be present). On the other hand, from the viewpoint of appropriately utilizing the contraction force of the rear waist elastic member 25, it is preferable that the absorption core 22 and the rear waist elastic member 25 do not overlap, that is, the distance D1 of the gap G1 is larger than 0.

In the absorbent article 1, the central auxiliary sheet 5 may be omitted, and the central elastic member 52 may be provided in the main body 2. In this case, the central elastic member 52 is provided, for example, between the top sheet 21 and the absorption core 22, or between the absorption core 22 and the back sheet 23. Further, the central elastic member 52 may be omitted in the front portion 201, and the central elastic member 52 may be provided from the crotch lower portion 202 to the rear portion 203. Also in this case, the central elastic member 52 intersects with 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, the main body portion 2 may be provided with the central elastic member 52 at least from the crotch lower portion 202 to the rear portion 203.

In the absorbent article 1, a waist elastic member extending in the width direction is provided between the front waist elastic member 24, the rear waist elastic member 25, and the inseam 202 (see the waist elastic member 28 in FIG. 10 described later), so-called. Body fit gathers may be formed. As a general rule, the contraction force of the waistline elastic member (the contraction force per unit width in the direction perpendicular to the longitudinal direction of the elastic member) is smaller than the contraction 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 non-woven fabric, and the adhered portion 29 or the adhered portion 29 is omitted. The outer surface of the front portion 201 may be a plastic film or the like to which the adhesive layer can be adhered. Also in this case, each connecting portion 4 can be attached to and detached from the outer surface of the front portion 201. Further, only one fastening tape 41 may be provided in each connection portion 4, or only one fastening portion may be provided in each fastening tape 41.

The above method of suppressing the rear end edge 207 of the main body 2 from being excessively curved is adopted in a pants-type disposable diaper in which both sides of the front portion 201 and both sides of the rear portion 203 are previously joined. May be done. FIG. 10 shows a state in which the pants-type absorbent article 1a is unfolded. In the absorbent article 1a, the main body 2 includes an exterior sheet 20 and a substantially sheet-shaped absorber 220. The absorber 220 includes an absorption 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 of FIG. 10 showing the unfolded state is the longitudinal direction of the main body 2, and both the exterior sheet 20 and the absorber 220 extend in the longitudinal direction. The main body 2 of the absorbent article 1a is also a seat member extending in the longitudinal direction provided with the absorbing core 22 like the main body 2 of the absorbent article 1 of FIG. The rear portion 203 is provided in order in the longitudinal direction. In the absorbent article 1a, both side portions of the exterior sheet 20 in the front portion 201 and both side portions of the exterior sheet 20 in the rear portion 203 are joined to each other, a body opening is provided at the upper end, and a pair of leg openings are provided at the lower end. Is provided.

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

A pair of side seats 3 extending in the longitudinal direction are provided on both side portions of the absorber 220, and a central auxiliary seat 5 extending in the longitudinal direction is provided between the pair of side seats 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 in a plan view (that is, when the absorbent article 1a in the unfolded state is viewed along the thickness direction as shown in FIG. 10), the central elastic member 52 absorbs at the crotch portion 202. It overlaps with the core 22 and intersects 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 absorbing core 22 located at the rear portion 203 and the rear waist elastic member 25 is 25 mm or less when the main body portion 2 is extended in the longitudinal direction. Is. As a result, it is possible to prevent the rear end edge 207 of the main body 2 from being excessively curved when the absorbent article 1a is contracted.

The above-described embodiment and the configurations in each modification may be appropriately combined as long as they do not conflict with each other.

1,1a Absorbent article 2 Main body 4 Connection 22 Absorbent core 24 Front waist elastic member 25 Rear waist elastic member 41 Fastening tape 52 Central elastic member 201 Front part 202 Inseam 203 Rear part 206 (Main body part) Front edge 207 Rear edge edge (of main body) 227 Rear edge edge (of absorption core) 251 Elastic elements (of elastic member of rear waist) C1, C2 Center line of (fastening tape) G1 Gap

Claims (9)

It is an absorbent article
A seat member that is provided with an absorption core and extends in the longitudinal direction, and has a main body portion having a front portion, a crotch portion, and a rear portion in this order in the longitudinal direction.
A rear waist elastic member provided in the rear portion along the rear end edge of the main body portion and extending in a width direction substantially perpendicular to the longitudinal direction.
It is provided in the main body portion from at least the crotch portion to the rear portion, and when the main body portion is viewed in a plan view, it overlaps with the absorption core in the crotch portion and intersects with the rear waist elastic member in the rear portion. Central elastic member and
With
When the main body portion is extended in the longitudinal direction, the distance between the rear end edge of the absorption core located at the rear portion and the rear waist elastic member is 25 mm or less. Absorbent article. The absorbent article according to claim 1.
Absorption characterized by further comprising a pair of connecting portions that are attached to both side portions of the rear portion and anchored to the outer surface of the front portion to connect the both side portions of the rear portion to the front portion. Sex goods. The absorbent article according to claim 2.
Each connection
The first fastening tape extending in the width direction and
A second fastening tape arranged between the first fastening tape and the rear end edge of the main body and extending in the width direction, and a second fastening tape.
An absorbent article comprising. The absorbent article according to claim 3.
The rear end edge of the absorption core is located between the center line extending in the width direction of the second fastening tape and the rear end edge of the main body in the longitudinal direction. Absorbent article. The absorbent article according to any one of claims 1 to 4.
An absorbent article characterized in that the elongation rate of the central elastic member at the time of joining to the main body portion is 1.7 times or less. The absorbent article according to any one of claims 1 to 5.
The rear waist elastic member comprises a plurality of elastic elements extending in the width direction.
The plurality of elastic elements
A first elastic element that intersects the central elastic member,
A second elastic element arranged between the first elastic element and the rear end edge of the main body and not intersecting with the central elastic member.
Absorbent article characterized by containing. The absorbent article according to any one of claims 1 to 6.
The front portion is further provided with a front waist elastic member provided along the front end edge of the main body portion and extending in the width direction.
The central elastic member is provided from the front portion to the rear portion.
An absorbent article characterized in that the central elastic member does not intersect with the front waist elastic member when the main body portion is viewed in a plan view. The absorbent article according to any one of claims 1 to 7.
An absorbent article characterized in that, in the absorption core, the width in the width direction at the rear portion is larger than the width at the crotch portion. The absorbent article according to any one of claims 1 to 8.
An absorbent article characterized in that both ends of the rear waist elastic member are located inside the both ends of the rear end edge of the absorption core in the width direction.

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