JP7175357B1 - Disposable absorbent article and method of making disposable absorbent article - Google Patents

Abstract

An object of the present invention is to improve breathability and cushioning properties on the back side of a pants-type disposable absorbent article. SOLUTION: In the absorbent article, the contraction of the intermediate elastic member 45 in the left-right direction causes the rear cushion sheet 6 to contract in the left-right direction. A portion of the rear cushion sheet 6 protrudes toward the non-wearer side together with the rear pressing sheet 53 to form a plurality of first vertical grooves 63, and the skin on the back side of the wearer and the plurality of first vertical grooves are formed. An air passage 65 surrounded by the inner surface of 63 is formed. In addition, a plurality of second vertical grooves 64 are formed by a portion of the rear cushion sheet 6 being spaced apart from the exterior sheet 4 and protruding toward the wearer. A buffer space 66 surrounded by the inner surfaces of the two longitudinal grooves 64 is formed. Thereby, the air permeability and cushioning properties on the back side can be improved. [Selection drawing] Fig. 10

Description

The present invention relates to a pants-type disposable absorbent article and a method for manufacturing a pants-type disposable absorbent article.

Conventionally, a pants-type disposable diaper having a body opening at the upper end and a pair of leg openings at the lower end has been used as one of absorbent articles for receiving excrement from a wearer. In this disposable diaper, a sheet-like absorbent body is fixed to the inner side of a pants-type exterior sheet. Elastic members are provided in the vicinity of the trunk opening, the vicinity of the pair of leg openings, and the waist circumference of the exterior sheet, and the disposable diaper fits the wearer by contraction of these elastic members. In such disposable diapers, the outer sheet may adhere to the skin, resulting in decreased breathability, or may be pressed against the skin, resulting in decreased wearability.

Therefore, in Patent Document 1, in a pants-type disposable diaper, it is proposed to provide a cushion-forming sheet extending downward from the edge of the opening of the body portion on the inner surface of the waist portion of the exterior sheet. The cushion-forming sheet is intermittently joined to the inner sheet of the exterior sheet in the left-right direction. In the disposable diaper, when the elastic member provided on the exterior sheet contracts, the inner sheet and the cushion-forming sheet are wrinkled and partially separated from each other, allowing ventilation between the inner sheet and the cushion-forming sheet. A path is formed. This improves the breathability and cushioning properties around the waist of the wearer. Like the inner and outer sheets of the exterior sheet, the cushion-forming sheet is made of breathable nonwoven fabric, and is provided with a large number of holes by punching or the like.

On the other hand, Patent Literature 2 proposes a technique for improving the breathability around the waist of a tape-type disposable diaper. In the disposable diaper, a back sheet formed of a thermoplastic resin film or the like is partially cut away in a region where the elastic member is not provided between the waist elastic member and the longitudinal end of the absorbent core. A hydrophobic member, such as an apertured film or a non-woven fabric, is provided to cover the area covered by the surface. As a result, the area provided with the hydrophobic member serves as a ventilation portion, and the ventilation is improved. It is preferable that the top sheet is separated from the hydrophobic member in a state where body pressure or the like is not applied to the ventilation part.

JP 2016-042918 A JP 2007-105127 A

By the way, the cushion-forming sheet of Patent Document 1 is a thin sheet member made of nonwoven fabric, like the inner and outer sheets of the exterior sheet. Therefore, when body pressure is applied to the cushion-forming sheet, such as when the wearer lies on his or her back, the ventilation path between the cushion-forming sheet and the inner sheet is crushed, and the cushion-forming sheet is brought into close contact with the inner sheet. As a result, the breathability and cushioning properties of the outer sheet around the waist deteriorate, and the feeling of wearing deteriorates.

The hydrophobic member of Patent Document 2 is a thin sheet member such as a perforated film, and does not overlap with the elastic member, so wrinkles or the like due to contraction of the elastic member are not formed. Therefore, the tape-type disposable diaper disclosed in Patent Document 2 does not have a structure corresponding to the ventilation path disclosed in Patent Document 1, and does not improve the cushioning properties around the waist. In the disposable diaper of Patent Document 2, the top sheet is separated from the hydrophobic member when body pressure is not applied to the vent. When pressure is applied, the topsheet adheres to the hydrophobic member. As a result, the ventilation around the waist of the outer sheet deteriorates, and the feeling of wearing deteriorates.

The present invention has been made in view of the above problems, and an object of the present invention is to improve breathability and cushioning properties on the back side of a pants-type disposable absorbent article.

The invention according to claim 1 is a pants-type disposable absorbent article comprising an outer sheet having a body opening at the upper end and a pair of leg openings at the lower end, a liquid-permeable top sheet, an impermeable It has a liquid-permeable or liquid-repellent back sheet and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet to absorb excrement from the wearer. an absorbent body that absorbs, a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the outer sheet, and is thicker than the rear pressing sheet and the outer sheet, a rear cushion sheet fixed between the rear pressing sheet and the exterior sheet at a position spaced upward from the absorbent core, wherein the exterior sheet includes a front portion located on the abdomen side of the wearer; A rear portion located on the back side of the wearer and having both side ends connected to both side ends of the front portion, a crotch portion continuing from the front portion and the rear portion, and a waist circumference along the edge of the waist opening. a trunk elastic member that extends in the left-right direction at a region, is joined to the front portion and the rear portion, and shrinks to form a trunk opening gather; leg elastic members forming a pair of leg opening gathers by being joined to the body and contracting to form a pair of leg opening gathers; an intermediate elastic member that extends in the left-right direction and is joined to the front portion and the rear portion and contracts to form an intermediate gather, wherein the rear cushion seat is spaced downward from the trunk elastic member. The rear cushion seat contracts in the left-right direction by contracting the intermediate elastic member in the left-right direction, and a part of the rear cushion seat acts as the rear presser. By protruding toward the non-wearer side together with the seat, a plurality of first vertical grooves extending in the vertical direction are formed, and the skin on the back side of the wearer and the inner surface of the plurality of first vertical grooves are formed. and a part of the rear cushion sheet is separated from the outer sheet and protrudes toward the wearer, thereby extending in the vertical direction and connecting with the plurality of first longitudinal grooves. A plurality of second vertical grooves arranged alternately in the left-right direction are formed, and the surface of the outer sheet facing the wearer and the inner surface of the plurality of second vertical grooves are formed. The wearer-side surface of the rear cushion sheet is partially joined to the rear pressing sheet by intermittently applied adhesive, and the non-wearer-side surface of the rear cushion sheet The surface is partially joined to the rear portion of the exterior sheet by intermittently applied adhesive, and the adhesive-coated area on the non-wearer-side surface of the rear cushion sheet is the same as that of the rear cushion sheet. It is larger than the coating area of the adhesive on the wearer's side.
The invention according to claim 2 is a pants-type disposable absorbent article, comprising: an outer sheet having a trunk opening at the upper end and a pair of leg openings at the lower end; a liquid-permeable top sheet; It has a liquid-permeable or liquid-repellent back sheet and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet to absorb excrement from the wearer. an absorbent body that absorbs, a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the outer sheet, and is thicker than the rear pressing sheet and the outer sheet, a rear cushion sheet fixed between the rear pressing sheet and the exterior sheet at a position spaced upward from the absorbent core, wherein the exterior sheet includes a front portion located on the abdomen side of the wearer; A rear portion located on the back side of the wearer and having both side ends connected to both side ends of the front portion, a crotch portion continuing from the front portion and the rear portion, and a waist circumference along the edge of the waist opening. a trunk elastic member that extends in the left-right direction at a region, is joined to the front portion and the rear portion, and shrinks to form a trunk opening gather; leg elastic members forming a pair of leg opening gathers by being joined to the body and contracting to form a pair of leg opening gathers; an intermediate elastic member that extends in the left-right direction and is joined to the front portion and the rear portion and contracts to form an intermediate gather, wherein the rear cushion seat is spaced downward from the trunk elastic member. The rear cushion seat contracts in the left-right direction by contracting the intermediate elastic member in the left-right direction, and a part of the rear cushion seat acts as the rear presser. By protruding toward the non-wearer side together with the seat, a plurality of first vertical grooves extending in the vertical direction are formed, and the skin on the back side of the wearer and the inner surface of the plurality of first vertical grooves are formed. and a part of the rear cushion sheet is separated from the outer sheet and protrudes toward the wearer, thereby extending in the vertical direction and connecting with the plurality of first longitudinal grooves. A plurality of second vertical grooves arranged alternately in the left-right direction are formed, and the surface of the outer sheet facing the wearer and the inner surface of the plurality of second vertical grooves are formed. The wearer-side surface of the rear cushion seat is coated with striped adhesive on a plurality of inner coating regions extending in one of the horizontal and vertical directions. The non-wearer side surface of the rear cushion sheet is partially joined to the rear pressing sheet by the adhesive applied in stripes to a plurality of outer application areas extending in the application direction. The width in the direction perpendicular to the application direction of each outer application region on the non-wearer-side surface of the rear cushion sheet that is joined to the rear portion of the exterior sheet is It is larger than the width of the inner coating area in the direction perpendicular to the coating direction.
The invention according to claim 3 is a pants-type disposable absorbent article, comprising: an exterior sheet having a body opening at the upper end and a pair of leg openings at the bottom; a liquid-permeable top sheet; It has a liquid-permeable or liquid-repellent back sheet and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet to absorb excrement from the wearer. an absorbent body that absorbs, a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the outer sheet, and is thicker than the rear pressing sheet and the outer sheet, a rear cushion sheet fixed between the rear pressing sheet and the exterior sheet at a position spaced upward from the absorbent core, wherein the exterior sheet includes a front portion located on the abdomen side of the wearer; A rear portion located on the back side of the wearer and having both side ends connected to both side ends of the front portion, a crotch portion continuing from the front portion and the rear portion, and a waist circumference along the edge of the waist opening. a trunk elastic member that extends in the left-right direction at a region, is joined to the front portion and the rear portion, and shrinks to form a trunk opening gather; leg elastic members forming a pair of leg opening gathers by being joined to the body and contracting to form a pair of leg opening gathers; an intermediate elastic member that extends in the left-right direction and is joined to the front portion and the rear portion and contracts to form an intermediate gather, wherein the rear cushion seat is spaced downward from the trunk elastic member. The rear cushion seat contracts in the left-right direction by contracting the intermediate elastic member in the left-right direction, and a part of the rear cushion seat acts as the rear presser. By protruding toward the non-wearer side together with the seat, a plurality of first vertical grooves extending in the vertical direction are formed, and the skin on the back side of the wearer and the inner surface of the plurality of first vertical grooves are formed. and a part of the rear cushion sheet is separated from the outer sheet and protrudes toward the wearer, thereby extending in the vertical direction and connecting with the plurality of first longitudinal grooves. A plurality of second vertical grooves arranged alternately in the left-right direction are formed, and the surface of the outer sheet facing the wearer and the inner surface of the plurality of second vertical grooves are formed. The non-wearer side surface of the rear cushion sheet is partly covered by the adhesive striped on a plurality of laterally extending outer application areas of the exterior sheet. The plurality of outer application areas on the non-wearer-side surface of the rear cushion sheet, which are joined to the rear portion, are arranged avoiding the upper and lower ends of the rear cushion sheet.
The invention according to claim 4 is a pants-type disposable absorbent article, comprising: an outer sheet having a trunk opening at the upper end and a pair of leg openings at the lower end; a liquid-permeable top sheet; It has a liquid-permeable or liquid-repellent back sheet and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet to absorb excrement from the wearer. an absorbent body that absorbs, a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the outer sheet, and is thicker than the rear pressing sheet and the outer sheet, a rear cushion sheet fixed between the rear pressing sheet and the exterior sheet at a position spaced upward from the absorbent core, wherein the exterior sheet includes a front portion located on the abdomen side of the wearer; A rear portion located on the back side of the wearer and having both side ends connected to both side ends of the front portion, a crotch portion continuing from the front portion and the rear portion, and a waist circumference along the edge of the waist opening. a trunk elastic member that extends in the left-right direction at a region, is joined to the front portion and the rear portion, and shrinks to form a trunk opening gather; leg elastic members forming a pair of leg opening gathers by being joined to the body and contracting to form a pair of leg opening gathers; an intermediate elastic member that extends in the left-right direction and is joined to the front portion and the rear portion and contracts to form an intermediate gather, wherein the rear cushion seat is spaced downward from the trunk elastic member. The rear cushion seat contracts in the left-right direction by contracting the intermediate elastic member in the left-right direction, and a part of the rear cushion seat acts as the rear presser. By protruding toward the non-wearer side together with the seat, a plurality of first vertical grooves extending in the vertical direction are formed, and the skin on the back side of the wearer and the inner surface of the plurality of first vertical grooves are formed. and a part of the rear cushion sheet is separated from the outer sheet and protrudes toward the wearer, thereby extending in the vertical direction and connecting with the plurality of first longitudinal grooves. A plurality of second vertical grooves arranged alternately in the left-right direction are formed, and the surface of the outer sheet facing the wearer and the inner surface of the plurality of second vertical grooves are formed. A buffer space surrounded by is formed, and the vertical cross-sectional area of the buffer space is larger than the vertical cross-sectional area of the air passage.

The invention according to claim 5 is the disposable absorbent article according to any one of claims 1 to 4 , wherein the rear pressing sheet extends over the entire wearer-side surface of the rear cushion sheet. cover with

The invention according to claim 6 is the disposable absorbent article according to any one of claims 1 to 5 , wherein the width of the rear cushion seat in the left-right direction is the width of the upper end of the absorbent core on the back side. greater than the horizontal width.

The invention according to claim 7 is the disposable absorbent article according to any one of claims 1 to 6 , wherein the intermediate elastic members are arranged in the vertical direction and each extends in the horizontal direction. and the non-wearer-side surface of the rear cushion sheet is partially covered by the adhesive applied in stripes to a plurality of laterally extending outer application areas of the rear portion of the exterior sheet. and one outer application area on the non-wearer side surface of the rear cushion sheet overlaps one or more intermediate elastic elements in the thickness direction.

The invention according to claim 8 is the disposable absorbent article according to claim 7 , wherein the surface facing the wearer of the rear cushion sheet is coated in stripes on a plurality of inner coating regions extending in the left-right direction. One inner application area on the wearer-side surface of the rear cushion sheet overlaps the one or more intermediate elastic elements in the thickness direction.

According to a ninth aspect of the invention, there is provided a method for manufacturing a pants-type disposable absorbent article, comprising: an outer sheet having a trunk opening at the upper end and a pair of leg openings at the lower end; and a liquid-permeable top. It has a sheet, a liquid-impermeable or liquid-repellent backsheet, and an absorbent core disposed between the topsheet and the backsheet, and is fixed to the wearer side of the exterior sheet to prevent the wearer from an absorbent body that absorbs excrement from the wearer, a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the outer sheet, and the rear pressing sheet and the outer sheet and a rear cushion sheet fixed between the rear pressing sheet and the exterior sheet at a position spaced upward from the absorbent core, the exterior sheet being located on the abdomen side of the wearer. a rear portion located on the back side of the wearer and having both side ends connected to both side ends of the front portion; a crotch portion continuous from the front portion and the rear portion; a waist elastic member that extends in the left-right direction in a waist circumference region along the edges of the pair of leg openings and that is joined to the front portion and the rear portion and shrinks to form a waist opening gather; a leg elastic member that forms a pair of leg opening gathers by being joined to the crotch portion and contracted to form a pair of leg opening gathers; an intermediate elastic member that extends in the left-right direction in an elastic region, is joined to the front portion and the rear portion, and contracts to form an intermediate gather, wherein the rear cushion seat extends downward from the trunk elastic member; spaced apart from each other and overlapped with the intermediate elastic member in the thickness direction, and when the intermediate elastic member contracts in the left-right direction, the rear cushion seat contracts in the left-right direction, and a part of the rear cushion seat contracts By protruding toward the non-wearer side together with the rear pressing sheet, a plurality of first vertical grooves extending in the vertical direction are formed, and the skin on the back side of the wearer and the inside of the plurality of first vertical grooves are formed. and a portion of the rear cushion sheet is separated from the outer sheet and protrudes toward the wearer, thereby extending in the vertical direction and the plurality of first air passages. Vertical grooves and a plurality of second vertical grooves arranged alternately in the left-right direction are formed, and the wearer-side surface of the exterior sheet and the plurality of second vertical grooves are formed. The wearer-side surface of the rear cushion sheet is partially joined to the rear pressing sheet by intermittently applied adhesive, and the rear cushion sheet is non-removable. The wearer-side surface is partially joined to the rear portion of the exterior sheet by intermittently applied adhesive, and the adhesive-coated area on the non-wearer-side surface of the rear cushion sheet is The adhesive coating area on the wearer-side surface of the rear cushion sheet is larger than the adhesive coating area, and the method for manufacturing the disposable absorbent article comprises: a) joining the non-wearer-side surface of the absorbent body to the exterior sheet; b) a step of joining the wearer-side surface of the rear cushion sheet to the rear pressing sheet; a step of joining the surface and the non-wearer-side surface of the rear pressing sheet to the exterior sheet; forming the body opening and the pair of leg openings by joining the left and right ends of the front portion of the seat to the left and right ends of the rear portion of the seat.
According to a tenth aspect of the invention, there is provided a method for manufacturing a pants-type disposable absorbent article, comprising: an outer sheet having a body opening at the upper end and a pair of leg openings at the lower end; and a liquid-permeable top. It has a sheet, a liquid-impermeable or liquid-repellent backsheet, and an absorbent core disposed between the topsheet and the backsheet, and is fixed to the wearer side of the exterior sheet to prevent the wearer from an absorbent body that absorbs excrement from the wearer, a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the outer sheet, and the rear pressing sheet and the outer sheet and a rear cushion sheet fixed between the rear pressing sheet and the exterior sheet at a position spaced upward from the absorbent core, the exterior sheet being located on the abdomen side of the wearer. a rear portion located on the back side of the wearer and having both side ends connected to both side ends of the front portion; a crotch portion continuous from the front portion and the rear portion; a waist elastic member that extends in the left-right direction in a waist circumference region along the edges of the pair of leg openings and that is joined to the front portion and the rear portion and shrinks to form a waist opening gather; a leg elastic member that forms a pair of leg opening gathers by being joined to the crotch portion and contracted to form a pair of leg opening gathers; an intermediate elastic member that extends in the left-right direction in an elastic region, is joined to the front portion and the rear portion, and contracts to form an intermediate gather, wherein the rear cushion seat extends downward from the trunk elastic member; spaced apart from each other and overlapped with the intermediate elastic member in the thickness direction, and when the intermediate elastic member contracts in the left-right direction, the rear cushion seat contracts in the left-right direction, and a part of the rear cushion seat contracts By protruding toward the non-wearer side together with the rear pressing sheet, a plurality of first vertical grooves extending in the vertical direction are formed, and the skin on the back side of the wearer and the inside of the plurality of first vertical grooves are formed. and a portion of the rear cushion sheet is separated from the outer sheet and protrudes toward the wearer, thereby extending in the vertical direction and the plurality of first air passages. Vertical grooves and a plurality of second vertical grooves arranged alternately in the left-right direction are formed, and the wearer-side surface of the exterior sheet and the plurality of second vertical grooves are formed. The wearer-side surface of the rear cushion seat is coated in stripes on a plurality of inner coating regions extending in one of the horizontal and vertical directions. The surface of the rear cushion sheet facing the non-wearer is coated with adhesive in stripes on a plurality of outer application areas extending in the application direction. The width in the direction perpendicular to the application direction of each outer application area on the non-wearer side surface of the rear cushion sheet is the width of the wearer of the rear cushion sheet The method for manufacturing the disposable absorbent article comprises: a) bonding the non-wearer-side surface of the absorbent body to the exterior sheet; b) joining the wearer-side surface of the rear cushion sheet to the rear pressing sheet; a step of joining the side surface and the non-wearer side surface of the rear pressing sheet to the exterior sheet; forming the body opening and the pair of leg openings by joining both the left and right ends of the front portion of the exterior sheet and the left and right ends of the rear portion of the exterior sheet.
The invention according to claim 11 is a method for manufacturing a pants-type disposable absorbent article, comprising: an exterior sheet having a trunk opening at the upper end and a pair of leg openings at the lower end; and a liquid-permeable top. It has a sheet, a liquid-impermeable or liquid-repellent backsheet, and an absorbent core disposed between the topsheet and the backsheet, and is fixed to the wearer side of the exterior sheet to prevent the wearer from an absorbent body that absorbs excrement from the wearer, a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the outer sheet, and the rear pressing sheet and the outer sheet and a rear cushion sheet fixed between the rear pressing sheet and the exterior sheet at a position spaced upward from the absorbent core, the exterior sheet being located on the abdomen side of the wearer. a rear portion located on the back side of the wearer and having both side ends connected to both side ends of the front portion; a crotch portion continuous from the front portion and the rear portion; a waist elastic member that extends in the left-right direction in a waist circumference region along the edges of the pair of leg openings and that is joined to the front portion and the rear portion and shrinks to form a waist opening gather; a leg elastic member that forms a pair of leg opening gathers by being joined to the crotch portion and contracted to form a pair of leg opening gathers; an intermediate elastic member that extends in the left-right direction in an elastic region, is joined to the front portion and the rear portion, and contracts to form an intermediate gather, wherein the rear cushion seat extends downward from the trunk elastic member; spaced apart from each other and overlapped with the intermediate elastic member in the thickness direction, and when the intermediate elastic member contracts in the left-right direction, the rear cushion seat contracts in the left-right direction, and a part of the rear cushion seat contracts By protruding toward the non-wearer side together with the rear pressing sheet, a plurality of first vertical grooves extending in the vertical direction are formed, and the skin on the back side of the wearer and the inside of the plurality of first vertical grooves are formed. and a portion of the rear cushion sheet is separated from the outer sheet and protrudes toward the wearer, thereby extending in the vertical direction and the plurality of first air passages. Vertical grooves and a plurality of second vertical grooves arranged alternately in the left-right direction are formed, and the wearer-side surface of the exterior sheet and the plurality of second vertical grooves are formed. The non-wearer side surface of the rear cushion seat is partially formed by adhesive applied in stripes to a plurality of laterally extending outer application areas. The plurality of outer application regions on the non-wearer-side surface of the rear cushion sheet, which are joined to the rear portion of the exterior sheet, are arranged avoiding the upper and lower ends of the rear cushion sheet, and the disposable absorbent article. a) joining the non-wearer-side surface of the absorbent body to the exterior sheet; b) joining the wearer-side surface of the rear cushion sheet to the rear pressing sheet; c) joining the non-wearer-side surface of the rear cushion sheet and the non-wearer-side surface of the rear pressing sheet to the exterior sheet after the steps a) and b); After the step c), the exterior sheet is folded together with the absorbent body at the crotch portion, and both the left and right ends of the front portion of the exterior sheet are joined to the left and right ends of the rear portion of the exterior sheet. forming said body opening and said pair of leg openings by:
According to a twelfth aspect of the invention, there is provided a method for manufacturing a pants-type disposable absorbent article, comprising: an outer sheet having a trunk opening at the upper end and a pair of leg openings at the lower end; and a liquid-permeable top. It has a sheet, a liquid-impermeable or liquid-repellent backsheet, and an absorbent core disposed between the topsheet and the backsheet, and is fixed to the wearer side of the exterior sheet to prevent the wearer from an absorbent body that absorbs excrement from the wearer, a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the outer sheet, and the rear pressing sheet and the outer sheet and a rear cushion sheet fixed between the rear pressing sheet and the exterior sheet at a position spaced upward from the absorbent core, the exterior sheet being located on the abdomen side of the wearer. a rear portion located on the back side of the wearer and having both side ends connected to both side ends of the front portion; a crotch portion continuous from the front portion and the rear portion; a waist elastic member that extends in the left-right direction in a waist circumference region along the edge and is joined to the front portion and the rear portion and shrinks to form a waist opening gather, along edges of the pair of leg openings a leg elastic member that forms a pair of leg opening gathers by being joined to the crotch portion and contracted to form a pair of leg opening gathers; an intermediate elastic member that extends in the left-right direction in an elastic region, is joined to the front portion and the rear portion, and contracts to form an intermediate gather, wherein the rear cushion seat extends downward from the trunk elastic member; spaced apart from each other and overlapped with the intermediate elastic member in the thickness direction, and when the intermediate elastic member contracts in the left-right direction, the rear cushion seat contracts in the left-right direction, and a part of the rear cushion seat contracts By protruding toward the non-wearer side together with the rear pressing sheet, a plurality of first vertical grooves extending in the vertical direction are formed, and the skin on the back side of the wearer and the inside of the plurality of first vertical grooves are formed. and a portion of the rear cushion sheet is separated from the outer sheet and protrudes toward the wearer so as to extend in the vertical direction and the plurality of first air passages. Vertical grooves and a plurality of second vertical grooves arranged alternately in the left-right direction are formed, and the wearer-side surface of the exterior sheet and the plurality of second vertical grooves are formed. a buffer space surrounded by the inner surface of the disposable absorbent article, wherein the cross-sectional area perpendicular to the vertical direction of the buffer space is larger than the cross-sectional area perpendicular to the vertical direction of the air passage; a) joining the non-wearer-side surface of the absorbent body to the exterior sheet; b) joining the wearer-side surface of the rear cushion sheet to the rear pressing sheet; a) joining the non-wearer-side surface of the rear cushion sheet and the non-wearer-side surface of the rear pressing sheet to the exterior sheet after the steps of a) and b), and d) c). After the step, the exterior sheet is folded together with the absorbent body at the crotch portion, and the left and right ends of the front portion of the exterior sheet and the left and right ends of the rear portion of the exterior sheet are joined. and forming said body opening and said pair of leg openings.

The present invention can improve the breathability and cushioning properties on the back side.

1 is a front view of an absorbent article according to one embodiment; FIG. 1 is a rear view of an absorbent article; FIG. 1 is a plan view of an absorbent article in an unfolded state; FIG. 1 is a cross-sectional view of an absorbent article; FIG. 1 is a cross-sectional view showing part of an absorbent article; FIG. It is the figure which looked at the part near the back cushion sheet from the wearer's side. It is the figure which looked at the site|part near the rear cushion seat from the non-wearer side. It is the figure which looked at the part near the back cushion sheet from the wearer's side. It is the figure which looked at the site|part near the rear cushion seat from the non-wearer side. FIG. 4 is a cross-sectional view showing the back portion of the absorbent article; It is a figure which shows the flow of manufacture of an absorbent article. It is a figure which shows a part of manufacturing apparatus of an absorbent article.

1 and 2 are respectively a front view and a back view (that is, views of the wearer's ventral side and back side) of a disposable absorbent article 1 according to one embodiment of the present invention. In the following description, the disposable absorbent article 1 is simply referred to as "absorbent article 1". As shown in FIGS. 1 and 2, the absorbent article 1 has a body opening 11 at its upper end (that is, the upper end in FIGS. 1 and 2) and a pair of leg openings 12 at its lower portion. It is a pants-type disposable diaper that has an internal structure and receives excrement from the wearer. The excrement is typically urine and stool, and also includes blood, vaginal discharge, sweat, and the like. In the following description, the upper and lower sides in FIGS. 1 and 2 (that is, the upper and lower sides when the absorbent article 1 is worn by the wearer in the standing state) are simply referred to as "upper" and "lower." ” is also called. Further, the left-right direction of the absorbent article 1 when worn by the wearer is also simply referred to as the "left-right direction".

FIG. 3 is a plan view of the absorbent article 1 unfolded and viewed from the wearer's side in a state in which the elastic members in each part are stretched. The absorbent article 1 includes an exterior sheet 4 , an absorbent body 20 , a front pressing sheet 51 , a rear pressing sheet 53 and a rear cushion sheet 6 . In the example shown in FIG. 3, the shape of the absorber 20 in plan view is substantially rectangular. The shape of the absorber 20 in plan view may be changed as appropriate. The exterior sheet 4 is provided with the above-described trunk opening 11 and a pair of leg openings 12 (see FIGS. 1 and 2). The absorber 20 is fixed on the inner surface of the exterior sheet 4 (that is, the wearer-side surface). The absorber 20 is a substantially sheet-like member that absorbs excrement from the wearer. The front pressing sheet 51, the rear pressing sheet 53 and the rear cushion sheet 6 will be described later.

In the absorbent article 1, the upper part in FIG. 3 covers the wearer's front side (ie, ventral skin), and the lower part in FIG. 3 covers the wearer's back side (ie, dorsal skin). ). In the following description, portions of the absorbent article 1 located on the wearer's ventral side and dorsal side are referred to as a "front portion 401" and a "rear portion 403", respectively. A portion of the absorbent article 1 between the front portion 401 and the rear portion 403 is called a "crotch portion 402". Crotch portion 402 continues from front portion 401 and rear portion 403 . The crotch portion 402 covers the wearer's crotch region. The front part 401 , the crotch part 402 and the rear part 403 of the absorbent article 1 are also the front part, the crotch part and the rear part of the exterior sheet 4 . In other words, the exterior sheet 4 has a front portion 401 , a crotch portion 402 and a rear portion 403 . The absorber 20 extends from the front portion 401 of the exterior sheet 4 to the rear portion 403 via the crotch portion 402 .

When the absorbent article 1 is manufactured, the exterior sheet 4 is folded at the crotch portion 402 together with the absorbent body 20 . Then, the inner surfaces of both left and right ends of the front portion 401 of the exterior sheet 4 and the inner surfaces of both left and right ends of the rear portion 403 of the exterior sheet 4 are connected by thermocompression bonding or the like by heating and pressing. Thereby, as shown in FIGS. 1 and 2, the trunk openings 11 are formed at the upper ends of the front portion 401 and the rear portion 403 . A pair of leg openings 12 are formed on the left and right sides of the crotch portion 402 below the front portion 401 and the rear portion 403 .

FIG. 4 is a cross-sectional view of the absorbent article 1 taken along line IV-IV shown in FIG. 3 (that is, the crotch portion 402). In FIG. 4, each component of the absorbent article 1 is drawn separately for the convenience of illustration. The same applies to FIG. 5, which will be described later. As shown in FIGS. 3 and 4, the absorbent body 20 includes a main body portion 2 and a pair of side sheets 3. As shown in FIGS. The pair of side seats 3 are arranged on both sides of the main body 2 (that is, on both sides in the left-right direction perpendicular to the up-down direction). Each of the side sheets 3 is a substantially sheet-like member covering substantially the entire length in the longitudinal direction of the main body 2 (that is, the direction parallel to the up-down direction when worn).

The body portion 2 is a substantially sheet-like member and includes a top sheet 21 , a back sheet 23 and an absorbent core 22 . The top sheet 21 is a liquid-permeable sheet member. The back sheet 23 is a liquid-impermeable or liquid-repellent sheet member. The absorbent core 22 is a substantially sheet-like member arranged between the top sheet 21 and the back sheet 23 . The top sheet 21 covers the wearer-side surface of the absorbent core 22 . The backsheet 23 covers the surface of the absorbent core 22 opposite to the wearer (that is, the surface facing the non-wearer).

The topsheet 21 captures moisture from the wearer's exudates and transfers it 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 .

In FIG. 3, the contour of the absorbent core 22 of the absorbent body 20 is drawn with a thick dashed line for easy understanding of the drawing. The same applies to FIGS. 1 and 2 as well. As shown in FIG. 3 , the width at both ends of the absorbent core 22 in the longitudinal direction is greater than the width at the central portion in the longitudinal direction of the absorbent core 22 . In other words, the shape of the absorbent core 22 in plan view is a so-called hourglass shape. The back sheet 23 shown in FIG. 4 is bonded onto the exterior sheet 4 with an adhesive or the like. Thereby, the absorber 20 is fixed to the exterior sheet 4 . The shape of the absorbent core 22 in plan view may be changed as appropriate. A hot-melt adhesive, for example, can be used as the adhesive. The adhesive may be an adhesive other than a hot melt adhesive. The same applies to adhesives in the following description.

Each of the pair of side seats 3 has a side wall fixing portion 33 and a side wall upright portion 34 . The side wall fixing portion 33 is a belt-like portion on one side of a bending line 39 provided over the entire length of the side seat 3 in the longitudinal direction. The side wall fixing portion 33 is joined to the upper side (that is, the wearer's side) of the main body portion 2 using an adhesive agent or the like over approximately the entire length in the longitudinal direction in the vicinity of the side edge of the main body portion 2 . The side wall upright portion 34 is a strip-shaped portion of the side seat 3 on the other side of the folding line 39 . The side wall upright portion 34 is a portion that continues from the pair of side wall fixing portions 33 at a bending line 39 (that is, the lateral outer edge of the side wall fixing portion 33). The side wall upright portions 34 extend over approximately the entire length of the body portion 2 in the longitudinal direction on both sides of the body portion 2 .

Each of the side wall upright portions 34 is fixed to the side wall fixing portion 33 by being overlapped on the side wall fixing portion 33 at both ends in the longitudinal direction. The side wall upright portion 34 and the side wall fixing portion 33 are fixed by, for example, thermocompression bonding, ultrasonic bonding, or bonding with an adhesive or the like. A portion of each side wall upright portion 34 excluding both ends in the longitudinal direction (that is, the central portion in the longitudinal direction) is not joined to the side wall fixing portion 33 and can be separated from the side wall fixing portion 33 toward the wearer. A side wall elastic member 35 is joined to the free end of each side wall upright portion 34 . By contracting the side wall elastic member 35, the longitudinal central portion of the side wall upright portion 34 is upright to form a three-dimensional gather. As a result, excrement received by the absorber 20 between the pair of side wall upright portions 34 can be prevented from leaking outside the pair of side wall upright portions 34 .

The top sheet 21 is made of, for example, a liquid-permeable nonwoven fabric (such as an air-through nonwoven fabric, a point-bonded nonwoven fabric, a spunbonded nonwoven fabric, or a spunlace 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 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 example shown in FIG. 4, 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 backsheet 23 is formed of, for example, a liquid-impermeable or liquid-repellent nonwoven fabric (spunbond nonwoven fabric, meltblown nonwoven fabric, SMS (spunbond-meltblown-spunbond) nonwoven fabric, etc.) made of hydrophobic fibers. Alternatively, the backsheet 23 is formed of a liquid-impermeable 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 sheet body of the side sheet 3 is formed of a liquid-impermeable or liquid-repellent nonwoven fabric (for example, spunbond nonwoven fabric, meltblown nonwoven fabric, SMS nonwoven fabric) made of hydrophobic fibers. As the side wall elastic member 35, for example, a polyurethane thread, a belt-like polyurethane film, or a thread-like or belt-like natural rubber is used. In this embodiment, polyurethane thread is used as the side wall elastic member 35 .

FIG. 5 is a cross-sectional view of a portion of the absorbent article 1 taken along line VV shown in FIG. In FIG. 5, the back side of the absorbent article 1 is shown. The structure of the front side of the absorbent article 1 is substantially the same as the structure of the rear side shown in FIG. The exterior sheet 4 includes an exterior sheet body 40 , leg elastic members 43 (see FIGS. 1 to 3 ), body elastic members 44 , and intermediate elastic members 45 . The leg elastic member 43 , the body elastic member 44 and the intermediate elastic member 45 are joined to the exterior sheet main body 40 .

The exterior sheet main body 40 includes a first exterior sheet 41 and a second exterior sheet 42 . The second exterior sheet 42 is laminated on the inner surface of the first exterior sheet 41 (that is, on the wearer's side) and joined to the first exterior sheet 41 . The bonding between the first exterior sheet 41 and the second exterior sheet 42 is performed, for example, by bonding with an adhesive or thermocompression bonding by thermal embossing. In the example shown in FIG. 5 , the first exterior sheet 41 includes a folded portion 46 folded back toward the wearer at the edge 111 of the body opening 11 . The folded portion 46 faces the second exterior sheet 42 in the thickness direction. When the upper end of the second exterior sheet 42 is positioned below the lower end of the folded portion 46, the folded portion 46 faces the portion of the first exterior sheet 41 other than the folded portion 46 in the thickness direction.

The first exterior sheet 41 and the second exterior sheet 42 are formed of a liquid-impermeable or liquid-repellent nonwoven fabric made of hydrophobic fibers, like the back sheet 23 . Alternatively, the first exterior sheet 41 and the second exterior sheet 42 may be a laminate of the nonwoven fabric and a liquid-impermeable or liquid-repellent plastic film. As the plastic film, it is preferable to use a film having moisture permeability. As the first exterior sheet 41 and the second exterior sheet 42, a liquid-permeable nonwoven fabric may be used as in the case of the top sheet 21. In the example shown in FIG. 5, each of the first exterior sheet 41 and the second exterior sheet 42 is a nonwoven fabric sheet.

As shown in FIGS. 1 and 2, the leg elastic members 43 are arranged along the edges 121 of the pair of leg openings 12 . The leg elastic member 43 is, for example, a polyurethane thread, a belt-like polyurethane film, or a thread-like or belt-like natural rubber. In the example shown in Figures 1 and 2, the leg elastic member 43 comprises a plurality of leg elastic elements 431 each of which is a polyurethane thread. The plurality of leg elastic elements 431 are arranged substantially parallel to each other.

The leg elastic members 43 are arranged between the first exterior sheet 41 and the second exterior sheet 42 of the exterior sheet body 40, and are joined to the first exterior sheet 41 and the second exterior sheet 42 with an adhesive or the like. The upper end of each leg elastic member 43 is positioned at the front portion 401 and the rear portion 403 of the exterior sheet 4 . Also, the portions of the leg elastic members 43 other than the upper end portion are located in the crotch portion 402 of the exterior sheet 4 . In the absorbent article 1, the contraction of the leg elastic members 43 causes the exterior sheet body 40 to contract in the vicinity of the pair of leg openings 12, forming a pair of leg gathers (i.e., a pair of leg A partial aperture gather) is formed.

The torso elastic member 44 is joined to the front portion 401 and the rear portion 403 in the waist region along the edge 111 of the torso opening 11 . The trunk elastic member 44 is provided over substantially the entire length in the left-right direction of the front portion 401 and the rear portion 403 . The trunk elastic member 44 is, for example, a polyurethane thread, a belt-like polyurethane film, or a thread-like or belt-like natural rubber. In the example shown in Figures 1 and 2, the torso elastic member 44 comprises a plurality of torso elastic elements 441, each of which is a polyurethane thread. The multiple torso elastic elements 441 extend substantially parallel in the left-right direction.

In the example shown in FIG. 5, some of the body elastic elements 441 of the body elastic members 44 are arranged between the second exterior sheet 42 and the portion other than the folded portion 46 of the first exterior sheet 41, It is bonded to the first exterior sheet 41 and the second exterior sheet 42 with an adhesive or the like. Another torso elastic element 441 of the torso elastic member 44 is arranged between the folded portion 46 of the first exterior sheet 41 and the second exterior sheet 42 , and is arranged between the folded portion 46 and the second exterior sheet 42 . They are joined by an adhesive or the like. In the absorbent article 1, the contraction of the body elastic member 44 causes the exterior sheet body 40 to contract in the vicinity of the body opening 11, forming waist gathers (that is, body opening gathers) in contact with the waist of the wearer. be.

The intermediate elastic member 45 is arranged between the front portion 401 and the rear portion 403 in a region between the upper ends of the leg elastic members 43 and the trunk elastic member 44 in the vertical direction (hereinafter also referred to as "intermediate elastic region"). spliced. The intermediate elastic member 45 is provided over substantially the entire length of the front portion 401 and the rear portion 403 in the left-right direction. The intermediate elastic member 45 is, for example, a polyurethane thread, a belt-like polyurethane film, or a thread-like or belt-like natural rubber. In the example shown in Figure 5, the intermediate elastic member 45 comprises a plurality of intermediate elastic elements 451, each of which is a polyurethane thread. The plurality of intermediate elastic elements 451 are arranged in the vertical direction and extend substantially parallel in the horizontal direction. The fineness of the intermediate elastic element 451 is, for example, smaller than the fineness of the leg elastic element 431 and the fineness of the trunk elastic element 441 .

The intermediate elastic member 45 is arranged between the first exterior sheet 41 and the second exterior sheet 42 of the exterior sheet main body 40 in the intermediate elastic region, and is attached to the first exterior sheet 41 and the second exterior sheet 42 with an adhesive or the like. spliced. In the absorbent article 1, the contraction of the intermediate elastic member 45 causes contraction of the outer sheet main body 40, forming body-fitting gathers (that is, intermediate gathers) in contact with the lower abdomen and buttocks of the wearer.

In the example shown in FIG. 5, some upper intermediate elastic elements 451 of the plurality of intermediate elastic elements 451 overlap the folded portion 46 in the thickness direction. Note that all the intermediate elastic elements 451 may be arranged below the lower end of the folded portion 46 while avoiding the folded portion 46 . All the intermediate elastic elements 451 are preferably arranged above the upper end of the absorbent core 22 while avoiding the absorbent core 22 . This suppresses contraction of the upper end portion of the absorbent core 22 in the left-right direction due to the contractile force of the intermediate elastic element 451 .

In the example shown in FIG. 5 , all the intermediate elastic elements 451 are arranged above the upper end of the absorbent body 20 while avoiding the absorbent body 20 . Among the plurality of intermediate elastic elements 451, some of the intermediate elastic elements 451 on the lower side are located above the absorbent core 22 of the absorbent body 20 (that is, the top sheet 21 extending above the upper end of the absorbent core 22). and the back sheet 23) in the thickness direction. A part of the intermediate elastic elements 451 on the lower side of the plurality of intermediate elastic elements 451 may overlap the upper end portion of the absorbent core 22 in the thickness direction.

The rear pressing sheet 53 is fixed to the inner surface of the exterior sheet 4 on the back side of the wearer, covering the upper end portion of the rear side of the absorbent body 20 from the wearer side. Thereby, it is possible to prevent or suppress peeling of the rear upper end portion of the absorbent body 20 from the exterior sheet 4 due to friction with the wearer's skin or the like. The rear pressing sheet 53 and the exterior sheet 4 are joined together by, for example, an adhesive. The rear pressing sheet 53 is, for example, a substantially rectangular sheet member having a width in the left-right direction larger than that of the absorbent body 20 . In the example shown in FIG. 3, the rear pressing sheet 53 is provided over substantially the entire length of the exterior sheet 4 in the left-right direction.

In the example shown in FIG. 5 , the upper end of the rear pressing sheet 53 is arranged between the folded portion 46 of the exterior sheet 4 and the second exterior sheet 42 and joined to the folded portion 46 and the second exterior sheet 42 . The upper end of the rear pressing sheet 53 is positioned above the lower end of the folded portion 46 . Further, the lower end portion of the rear pressing sheet 53 overlaps the upper end portion of the absorber 20 from the wearer side as described above. The lower end of the rear pressing sheet 53 is positioned below the upper end of the absorber 20 . Preferably, the lower end of the rear pressing sheet 53 is located below the upper end of the absorbent core 22, and the lower end of the rear pressing sheet 53 and the upper end of the absorbent core 22 overlap in the thickness direction. A lower end portion of the rear pressing sheet 53 is joined to an upper end portion of the absorbent body 20 . The rear pressing sheet 53 and the absorbent body 20 are joined together by, for example, an adhesive.

Like the top sheet 21, the rear pressing sheet 53 is made of a liquid-permeable nonwoven fabric made of hydrophilic fibers or hydrophilic-treated hydrophobic fibers. Alternatively, the rear pressing sheet 53 may be made of a liquid-impermeable or liquid-repellent nonwoven fabric made of hydrophobic fibers, like the back sheet 23 .

As shown in FIG. 3 , the front pressing sheet 51 is fixed to the inner surface of the exterior sheet 4 on the wearer's abdomen, covering the front upper end of the absorbent body 20 from the wearer's side. Thereby, it is possible to prevent or suppress peeling of the front upper end portion of the absorber 20 from the exterior sheet 4 due to friction with the wearer's skin or the like. The size, arrangement, material, joining mode, etc. of the front pressing sheet 51 are substantially the same as those of the rear pressing sheet 53 described above.

As shown in FIG. 5, the rear cushion sheet 6 is arranged on the back side of the wearer in the intermediate elastic region (that is, the region where the intermediate elastic member 45 is provided). The rear cushion sheet 6 is fixed at a position spaced upward from the absorbent core 22 between the rear pressing sheet 53 and the exterior sheet 4 . The rear cushion sheet 6 is a bulky sheet-like member that is thicker than the rear pressing sheet 53 and the exterior sheet 4 . Specifically, the thickness of the rear cushion sheet 6 in its natural state (that is, in its unstretched and unstretched state) is greater than the thickness of each of the rear pressing sheet 53 and the exterior sheet 4 in its natural state. In the example shown in FIG. 5 , the rear cushion sheet 6 is arranged at a position spaced upward from the upper end of the absorbent body 20 . The vertical distance between the lower end of the rear cushion sheet 6 and the upper end of the absorbent body 20 is, for example, 5 mm to 15 mm.

The rear cushion sheet 6 is, for example, a permeable porous sheet member made of polyurethane (that is, urethane resin). The rear cushion seat 6 is made of, for example, a polyurethane open-cell foam obtained by heat compression molding. The material used for hot compression molding is, for example, flexible polyurethane foam, preferably flexible slab polyurethane foam. The thickness of the rear cushion sheet 6 in its natural state is, for example, 2 mm to 10 mm. The thickness was measured using a digital vernier caliper. The density of the rear cushion seat 6 in its natural state is, for example, 100 kg/m ³ to 200 kg/m ³ , preferably 120 kg/m ³ to 180 kg/m ³ , more preferably 130 kg/m ³ to 170 kg/m ³ . is. The density is measured using a balance according to "JIS K 7222".

The bending resistance of the rear cushion sheet 6 in the natural state is, for example, 65 mm or more, preferably 70 mm or more, and more preferably 80 mm or more. Also, the bending resistance is, for example, 130 mm or less, preferably 110 mm or less, and more preferably 90 mm or less. The bending resistance is measured using a cantilever type tester according to "JIS L 1913:2010". The water permeation rate of the rear cushion sheet 6 in the natural state is, for example, 0.125 mL/second or more, preferably 0.20 mL/second, and more preferably 0.25 mL/second. The water permeation rate is obtained by dropping 0.5 mL (1 drop) of ion-exchanged water from a position 5 cm above the rear cushion sheet 6 in a natural state, and measuring the time (seconds) until the water drops disappear from the rear cushion sheet 6. It is calculated by measuring.

The material and thickness of the rear cushion seat 6 may be changed variously. For example, the rear cushion sheet 6 may be made of nonwoven fabric. In this case, it is preferable that the basis weight of the rear cushion sheet 6 is larger than the basis weight of each of the rear pressing sheet 53 and the exterior sheet 4 . Also, the rear cushion seat 6 does not necessarily have to have air permeability, but preferably has air permeability.

In the example shown in FIG. 3, the rear cushion seat 6 has a substantially rectangular shape. The lateral width of the rear cushion sheet 6 is preferably larger than the lateral width of the upper end of the absorbent core 22 on the back side in both the wearing state and the non-wearing state of the absorbent article 1 . For example, in the absorbent article 1 in the non-worn state, the lateral width of the rear cushion sheet 6 is 1.1 times or more and 2 times or less the lateral width of the absorbent core 22 . The lateral width of the rear cushion seat 6 is preferably larger than the lateral width of the upper end of the absorbent body 20 on the back side. Further, the lateral width of the rear cushion seat 6 is smaller than the lateral width of the rear portion 403 of the exterior seat 4 at the position where the rear cushion seat 6 is provided in the vertical direction, for example.

As shown in FIG. 5, the length of the rear cushion sheet 6 in the vertical direction is shorter than the length of the rear pressing sheet 53 in the vertical direction. The upper end of the rear pressing sheet 53 is positioned above the upper end of the rear cushion seat 6 , and the lower end of the rear pressing sheet 53 is positioned below the lower end of the rear cushion seat 6 . The wearer-side surface of the rear cushion sheet 6 (that is, the left side surface in FIG. 5) is entirely covered with a rear pressing sheet 53 . The wearer-side surface of the rear cushion sheet 6 is joined to the non-wearer-side surface of the rear pressing sheet 53 (that is, the surface opposite to the wearer-side surface) with an adhesive, for example. The non-wearer-side surface of the rear cushion sheet 6 is partially joined to the wearer-side surface of the second exterior sheet 42 of the exterior sheet 4 by, for example, an adhesive.

The rear cushion seat 6 is arranged at a position spaced downward from the trunk elastic member 44 arranged in the waist region. In the example shown in FIG. 5 , the rear cushion seat 6 is positioned below the lower end of the folded portion 46 . The vertical distance between the upper end of the rear cushion seat 6 and the lower end of the folded portion 46 is, for example, 10 mm to 30 mm.

The rear cushion seat 6 is arranged at a position overlapping the intermediate elastic member 45 in the thickness direction in the intermediate elastic region. Specifically, the rear cushion seat 6 overlaps in the thickness direction with at least some of the intermediate elastic elements 451 among the plurality of intermediate elastic elements 451 arranged vertically in the intermediate elastic region. In the example shown in FIG. 5, the intermediate elastic member 45 has ten intermediate elastic elements 451, and the rear cushion seat 6 is arranged in the center of the ten intermediate elastic elements 451 in the vertical direction. It overlaps with the six intermediate elastic elements 451 in the thickness direction. Regarding the vertical spacing between the six intermediate elastic elements 451 overlapping the rear cushion seat 6 in the thickness direction, the spacing between the first and second elements from the top is relatively small, and the spacing between the second and third elements from the top is relatively small. Relatively large. Similarly, the distance between the third and fourth lines from the top is relatively small, the distance between the fourth and fifth lines from the top is relatively large, and the distance between the fifth and sixth lines from the top is relatively small.

FIG. 6 is a diagram of a portion of the absorbent article 1 near the rear cushion sheet 6 viewed from the wearer's side. In FIG. 6, illustration of the rear pressing sheet 53 is omitted, and the area of the rear cushion sheet 6 to be joined with the rear pressing sheet 53 (that is, the adhesive application area, hereinafter also referred to as the "inner application area 61"). ) are hatched. A plurality of inner application areas 61 extending in the left-right direction are provided in stripes (that is, borders) on the surface of the rear cushion sheet 6 facing the wearer.

Each inner application region 61 has a substantially rectangular band shape extending substantially parallel in the left-right direction, and traverses the entire width in the left-right direction of the surface of the rear cushion seat 6 on the wearer's side. In the example shown in FIG. 6, four inner application areas 61 substantially parallel to each other are arranged on the rear cushion sheet 6 so as to be separated from each other in the vertical direction. Of the four inner application areas 61, the lowermost inner application area 61 is arranged at the lower end of the rear cushion seat 6 (that is, near the lower edge).

In the following description, the longitudinal direction of the inner coating region 61 (the horizontal direction in the example shown in FIG. 6) is also called the "coating direction". The application direction may be the same as or different from the direction in which the adhesive is applied to the inner application region 61 when the absorbent article 1 is manufactured. The same applies to the outer coating region 62, which will be described later.

The wearer-side surface of the rear cushion sheet 6 is partially joined to the rear pressing sheet 53 by an adhesive that is intermittently applied in stripes to a plurality of inner application regions 61 extending in the left-right direction (that is, the application direction). be done. The plurality of inner application regions 61 preferably overlap the intermediate elastic member 45 in the thickness direction. Specifically, at least one inner application region 61 among the plurality of inner application regions 61 preferably overlaps at least one intermediate elastic element 451 in the thickness direction.

In the example shown in FIG. 6, the first inner application region 61 from the top of the four inner application regions 61 is the second from the top of the six intermediate elastic elements 451 overlapping the rear cushion sheet 6 in the thickness direction. It overlaps with the intermediate elastic element 451 of the thickness direction. In addition, the second inner application region 61 from the top overlaps the third intermediate elastic element 451 from the top among the six intermediate elastic elements 451 in the thickness direction. The third inner application area 61 from the top does not overlap any of the six intermediate elastic elements 451 . The fourth inner application region 61 from the top overlaps the sixth intermediate elastic element 451 from the top among the six intermediate elastic elements 451 in the thickness direction. Note that the inner application region 61 may overlap two or more intermediate elastic elements 451 in the thickness direction.

FIG. 7 is a diagram of a portion of the absorbent article 1 near the rear cushion sheet 6 viewed from the non-wearer side. In FIG. 7 , the joint region of the rear cushion sheet 6 with the rear portion 403 of the exterior sheet 4 (that is, the adhesive application region, hereinafter also referred to as the "outer application region 62") is hatched. On the non-wearer side surface of the rear cushion seat 6, a plurality of laterally extending outer application areas 62 are provided in a striped (that is, bordered) pattern.

Each of the outer application areas 62 has a substantially rectangular belt shape extending substantially parallel in the left-right direction, and traverses the non-wearer side surface of the rear cushion seat 6 across the entire width in the left-right direction. In the example shown in FIG. 7, two outer application areas 62 substantially parallel to each other are arranged on the rear cushion sheet 6 so as to be separated from each other in the vertical direction. The two outer application regions 62 are arranged to avoid the upper end and lower end of the rear cushion sheet 6 (that is, in regions other than the vicinity of the upper edge and the vicinity of the lower edge).

The non-wearer-side surface of the rear cushion sheet 6 is partially joined to the exterior sheet 4 by an adhesive that is intermittently applied in stripes to a plurality of outer application areas 62 extending in the left-right direction (that is, the application direction). be done. In the examples shown in FIGS. 6 and 7 , the vertical width of each outer coating region 62 (that is, the width in the direction perpendicular to the coating direction described above) is greater than the vertical width of each inner coating region 61 . In the rear cushion seat 6 , for example, the total area of all the outer application areas 62 is larger than the total area of all the inner application areas 61 . In other words, the adhesive coating area on the non-wearer side surface of the rear cushion sheet 6 is larger than the adhesive coating area on the wearer side surface of the rear cushion sheet 6 .

The upper outer coating region 62 of the two outer coating regions 62 partially overlaps the first and second inner coating regions 61 from the top of the four inner coating regions 61 in the thickness direction. In addition, the lower outer coating region 62 overlaps the entire third inner coating region 61 from the top among the four inner coating regions 61 in the thickness direction. The plurality of outer application regions 62 preferably overlap the intermediate elastic member 45 in the thickness direction. Specifically, at least one outer application region 62 among the plurality of outer application regions 62 preferably overlaps at least one intermediate elastic element 451 in the thickness direction. More preferably, at least one intermediate elastic element 451 overlaps both the inner application area 61 and the outer application area 62 .

In the example shown in FIG. 7, the upper outer coating region 62 of the two outer coating regions 62 is the second and third from the top of the six intermediate elastic elements 451 overlapping the rear cushion sheet 6 in the thickness direction. It overlaps with the intermediate elastic element 451 of the thickness direction. In addition, the lower outer coating region 62 overlaps the fourth and fifth intermediate elastic elements 451 from the top among the six intermediate elastic elements 451 in the thickness direction. Of the six intermediate elastic elements 451, the second and third intermediate elastic elements 451 from the top overlap both the inner application region 61 and the outer application region 62 in the thickness direction.

The number of inner application areas 61 provided on the wearer-side surface of the rear cushion sheet 6 may be varied. For example, the wearer-side surface of the rear cushion sheet 6 may be partially joined to the rear pressing sheet 53 at one or more inner application areas 61 . Alternatively, the wearer-side surface of the rear cushion sheet 6 may be joined to the rear pressing sheet 53 over the entire surface. The number of outer application areas 62 provided on the non-wearer side surface of the rear cushion seat 6 may vary. For example, the non-wearer side surface of the rear cushion sheet 6 may be partially joined to the rear portion 403 of the exterior sheet 4 at one or more outer application areas 62 .

The shapes of the inner coating region 61 and the outer coating region 62 described above do not necessarily have to be substantially rectangular band shapes, and may be changed in various ways. For example, the inner application area 61 and the outer application area 62 may each be substantially linear or wavy. In addition, the inner application region 61 and the outer application region 62 do not necessarily extend substantially parallel to the left-right direction. For example, as shown in FIGS. May be extended. In other words, the coating direction of the inner coating region 61 and the outer coating region 62 is one of the substantially horizontal direction and the substantially vertical direction.

In the example shown in FIGS. 8 and 9, the inner application area 61 and the outer application area 62 extend vertically across the entire length of the rear cushion seat 6 . In addition, the lateral width of each outer coating region 62 (that is, the width in the direction perpendicular to the coating direction) is larger than the lateral width of each inner coating region 61 . Furthermore, the adhesive coating area on the non-wearer side surface of the rear cushion sheet 6 is larger than the adhesive coating area on the wearer side surface of the rear cushion sheet 6 .

FIG. 10 is a cross-sectional view showing the back portion of the absorbent article 1 worn by the wearer. FIG. 10 shows a cross section of part of the absorbent article 1 at the central portion of the rear cushion seat 6 in the vertical direction. Specifically, the cross section shown in FIG. 10 is a cross section at a position between the second and third inner coating regions 61 from the top and between the two outer coating regions 62 . In the absorbent article 1, the intermediate elastic members 45 (see FIGS. 6 and 7) provided in the outer sheet 4 contract in the left-right direction, whereby the first outer sheet 41 and the second outer sheet 41 joined to the intermediate elastic members 45 are contracted. 2. The exterior sheet 42 shrinks in the left-right direction, forming body-fitting gathers in which a large number of fine wrinkles extending along the up-down direction are arranged in the left-right direction. In addition, the state of extending along the vertical direction means the state of extending substantially parallel to the vertical direction, and the state of extending obliquely while being inclined to some extent with respect to the vertical direction (for example, while being inclined at an inclination angle of less than 45°). including. The same applies to the following description.

Further, the contraction of the intermediate elastic member 45 in the lateral direction causes the rear cushion seat 6 fixed to the outer sheet 4 to contract in the lateral direction, which can be regarded as relatively large wrinkles (folds) extending along the vertical direction. ) are arranged in the horizontal direction to form a rear cushion portion 60 . The pitch of wrinkles in the rear cushion portion 60 (that is, the arithmetic mean of the lateral distance between the centers of each two protrusions adjacent in the lateral direction) is greater than the pitch of creases in the body-fit gathers. The thickness of the rear cushion part 60 in the thickness direction (that is, the distance in the thickness direction between the end face of the rear cushion part 60 on the wearer side and the end face on the non-wearer side) is, for example, 5 mm to 15 mm. .

In the rear cushion part 60 , a part of the rear cushion sheet 6 protrudes toward the non-wearer side together with the rear pressing sheet 53 , thereby forming a plurality of rear cushioning sheets each extending in the vertical direction toward the wearer side of the rear pressing sheet 53 . 1 flutes 63 are formed. The first vertical groove 63 is a portion that is recessed toward the non-wearer side when the rear cushion portion 60 is viewed from the wearer side. The value obtained by dividing the lateral width of the rear cushion seat 6 in the natural state by the number of the plurality of first longitudinal grooves 63 is, for example, 50 mm to 100 mm.

In the absorbent article 1, in the rear cushion portion 60, there are a plurality of air passages 65 surrounded by the surfaces inside the plurality of first vertical grooves 63 (that is, the surface facing the wearer) and the skin 91 on the back side of the wearer. is formed. Each ventilation path 65 is a space in which no member constituting the absorbent article 1 exists, and extends along the vertical direction. Each ventilation path 65 is provided continuously over substantially the entire length of the rear cushion seat 6 in the vertical direction, for example. Note that the plurality of ventilation paths 65 may form one ventilation path 65 continuously in the left-right direction.

In the rear cushion part 60, a part of the rear cushion sheet 6 is spaced apart from the exterior sheet 4 in the thickness direction and protrudes toward the wearer, so that the rear cushion sheet 6 extends vertically along the non-wearer side of the rear cushion sheet 6. A plurality of second longitudinal grooves 64 are formed, each extending in a vertical direction. The second vertical groove 64 is a portion that is recessed toward the wearer side when the rear cushion portion 60 is viewed from the non-wearer side. The plurality of second vertical grooves 64 and the plurality of first vertical grooves 63 are alternately arranged in the horizontal direction.

In the absorbent article 1 , in the rear cushion portion 60 , a plurality of cushioning members surrounded by the surfaces inside the plurality of second vertical grooves 64 (that is, the non-wearer-side surface) and the wearer-side surface of the exterior sheet 4 . A space 66 is formed. Each buffering space 66 is a space in which no member constituting the absorbent article 1 exists, and extends along the vertical direction. Each buffer space 66 is provided intermittently over substantially the entire length of the rear cushion sheet 6 in the vertical direction, except for the outer application area 62 where the rear cushion sheet 6 and the exterior sheet 4 are joined, for example. In addition, the plurality of buffer spaces 66 may form one buffer space 66 continuously in the left-right direction.

In the example shown in FIG. 10, the cross-sectional area of the buffer space 66 perpendicular to the vertical direction is larger than the cross-sectional area of the air passage 65 perpendicular to the vertical direction. The cross-sectional area of buffer space 66 is the arithmetic mean of the cross-sectional areas of a plurality of buffer spaces 66 . Moreover, the cross-sectional area of the air passage 65 is the arithmetic average of the cross-sectional areas of the plurality of air passages 65 . FIG. 10 shows a cross section of the rear cushion part 60 when worn. The cross-sectional area of 66 perpendicular to the up-down direction is larger than the cross-sectional area of air passage 65 perpendicular to the up-down direction, for example. The cross-sectional area of the cushioning space 66 may be smaller than or substantially the same as the cross-sectional area of the ventilation path 65 when the absorbent article 1 is worn and when the absorbent article 1 is not worn.

In the absorbent article 1, since the air passage 65 is provided in the rear cushion portion 60, moisture and the like trapped inside the absorbent article 1 in the wearer's crotch region, back side, etc. can pass through the air passage 65. is discharged to the outside of the absorbent article 1. As a result, it is possible to prevent the inside of the absorbent article 1 from becoming stuffy.

The ventilation path 65 is a space that is surrounded by the inner surfaces of the plurality of first vertical grooves 63 and the wearer's skin 91 and directly continues from the wearer's skin 91 . Further, when the wearer lies on his back and body pressure is applied to the rear cushion portion 60, the deformation of the skin 91 is suppressed as compared with the rear pressing sheet 53, the rear cushion sheet 6, and the like. Therefore, even when body pressure is applied to the rear cushion portion 60, the air passage 65 can be prevented from being crushed, and the inside of the absorbent article 1 can be prevented from becoming stuffy.

Furthermore, in the absorbent article 1, the cushioning space 66 is provided in the rear cushion part 60, so that the part to which body pressure is applied when the wearer lies on his back can be softened. As a result, it is possible to prevent the rear portion 403 of the absorbent article 1 from being strongly pressed against the skin on the back side of the wearer. In this way, in the absorbent article 1, the ventilation path 65 and the buffer space 66 are provided in the rear cushion portion 60, so that the breathability and cushioning properties on the back side of the absorbent article 1 can be improved. As a result, the wearing comfort of the absorbent article 1 can be improved.

Next, the absorbent articles 1 according to Examples 1 to 5 will be described with reference to Table 1. In Examples 1 to 5, the bending resistance of the rear cushion sheet 6 was changed, and the breathability of the rear cushion portion 60 of the absorbent article 1 was compared.

In Examples 1 to 5, a polyurethane sheet manufactured by INOAC Corporation was used as the rear cushion sheet 6 . In Examples 1 to 5, the bending resistance of the rear cushion sheet 6 in the natural state was 61.4 mm, 69.8 mm, 83.8 mm, 114.6 mm and 126.8 mm, respectively. The bending resistance was measured using a cantilever type testing machine (Daiei Kagaku Seiki Seisakusho CAN-45) in accordance with "JIS L 1913:2010" as described above. Specifically, first, a substantially rectangular test piece of 20 mm×150 mm is cut out from the rear cushion sheet 6 . Subsequently, the test piece is placed on the upper horizontal surface (hereinafter also referred to as "upper surface") of a cantilever type testing machine placed on a horizontal table. At this time, one short side of the test piece is aligned with the boundary between the upper surface and the slope of the cantilever type testing machine. Next, while the test piece is pressed against the upper surface of the cantilever type testing machine with a test plate, the test piece is gently slid toward the slope. Then, the amount of movement (mm) of the test piece until the central portion of the tip of the test piece (that is, the one short side) came into contact with the slope was measured. In each example, the bending resistance (mm) was defined as the arithmetic mean of the amount of movement measured for four test pieces.

The evaluation of breathability in Table 1 is the evaluation of breathability (in particular, breathability on the wearer's side) when each of the rear cushion sheets 6 of Examples 1 to 5 is provided in the absorbent article 1 . "Δ", "○" and "⊚" indicate that the air permeability increases in this order. The mark "⊚" indicates that the air passage 65 and the buffer space 66 were preferably formed over the entire length of the rear cushion portion 60 in the left-right direction, and the air permeability was very good. In the case of "○", the ventilation path 65 and the buffer space 66 are formed in more than half of the range in the left-right direction of the rear cushion part 60, but the ventilation path 65 and the buffer space 66 are formed in a part of the rear cushion part 60 in the left-right direction. Air permeability is lower than "⊚" because it is not formed by being crushed. At "Δ", the ventilation path 65 and the buffer space 66 are not crushed and formed in more than half of the range in the left-right direction of the rear cushion portion 60, so the air permeability is lower than that at "◯". Whether or not the air passage 65 and the buffer space 66 were formed was determined visually. In addition, in the absorbent article 1, the intermediate elastic element 451 of the intermediate elastic member 45 provided in the region overlapping the rear cushion sheet 6 is a polyurethane thread of 940 dtex, which is stretched to 3.0 times the length of the first exterior sheet. 41 and the second exterior sheet 42 .

In Table 1, the breathability of Example 3 is "⊚", the breathability of Examples 2, 4 and 5 is "◯", and the breathability of Example 1 is "Δ". Therefore, from the viewpoint of improving the breathability of the absorbent article 1, the bending resistance of the rear cushion sheet 6 in the natural state is, for example, 65 mm or more, preferably 70 mm or more, and more preferably 80 mm or more. Moreover, from the viewpoint of improving the breathability of the absorbent article 1, the bending resistance is, for example, 130 mm or less, preferably 110 mm or less, and more preferably 90 mm or less.

Next, a method for manufacturing the absorbent article 1 will be described with reference to FIGS. 11 and 12. FIG. FIG. 11 is a diagram showing the manufacturing flow of the absorbent article 1. FIG. FIG. 12 is a diagram showing a simplified configuration of part of the manufacturing apparatus 8 for the absorbent article 1. As shown in FIG.

In the following description, in the manufacturing apparatus 8, a long sheet member in which the member to be the first exterior sheet 41 of the exterior sheet 4 is continuous, and a long sheet member in which the member to be the second exterior sheet 42 is continuous. The strip-shaped sheet members are referred to as a first exterior sheet 41 and a second exterior sheet 42 for convenience. For the sake of convenience, an elongated elastic member in which the members intended to be the body elastic member 44, the intermediate elastic member 45, and the leg elastic member 43 are connected is referred to as an elastic member 47. As shown in FIG. Further, the elongated sheet member in which the member to be the rear pressing sheet 53 is continuous is called the rear pressing sheet 53 for convenience.

When the absorbent article 1 is manufactured, first, the elastic member 47 is joined between the first exterior sheet 41 and the second exterior sheet 42 with an adhesive or the like. As a result, an elongated sheet member (for convenience, referred to as an exterior sheet 4) in which members to be the exterior sheet 4 are continuous is formed (step S11). Subsequently, the non-wearer-side surface of the absorbent body 20 is bonded to the wearer-side surface of the exterior sheet 4 with an adhesive or the like (step S12). The outer sheet 4 to which the absorber 20 is joined is conveyed in the direction indicated by the arrow 86 in FIG.

Subsequently, an adhesive is applied by the coater 81 to the non-wearer side surface of the rear pressing sheet 53 . Then, the wearer-side surface of the rear cushion sheet 6 is bonded to the non-wearer-side surface of the rear pressing sheet 53 with the adhesive (step S13). The rear pressing sheet 53 to which the rear cushion sheet 6 is joined is conveyed in the direction indicated by the arrow 87 in FIG. Note that step S13 may be performed in parallel with step S12, or may be performed before or after step S12.

After step S13 is completed, the coater 82 applies an adhesive to the non-wearer side of the rear cushion sheet 6 . After that, the rear pressing sheet 53 to which the rear cushion sheet 6 is fixed and the exterior sheet 4 to which the absorbent body 20 is fixed are joined at a confluence point 83, and the surface of the rear cushion sheet 6 on the non-wearer side and The non-wearer-side surface of the rear pressing sheet 53 is bonded to the wearer-side surface of the exterior sheet 4 with the adhesive (step S14). In step S<b>14 , the non-wearer side surface of the rear pressing sheet 53 is also joined to the wearer side surface of the absorbent body 20 . Although not shown in FIG. 12, the front pressing sheet 51 (see FIG. 3) is also joined to the wearer-side surface of the outer sheet 4 and the absorbent body 20 with an adhesive.

Next, the exterior sheet 4 to which the rear pressing sheet 53, the rear cushion sheet 6, the absorbent body 20 and the like are joined is conveyed in the direction indicated by the arrow 88 in FIG. Then, the folded portion 46 (see FIG. 5) of the first exterior sheet 41 is folded back toward the wearer, and holes for the leg openings 12 are formed in the exterior sheet 4 . After that, the exterior sheet 4 corresponding to one absorbent article 1 is folded at the crotch portion 402 together with the absorbent body 20 . Both lateral ends of the front portion 401 of the exterior sheet 4 and both lateral ends of the rear portion 403 of the exterior sheet 4 are joined by heat sealing or the like to form the trunk opening 11 and the pair of leg openings 12 . is formed (step S15).

As described above, the absorbent article 1 is a pants-type disposable absorbent article. The absorbent article 1 includes an exterior sheet 4 , an absorbent body 20 , a rear pressing sheet 53 and a rear cushion sheet 6 . The exterior sheet 4 has a trunk opening 11 at its upper end and a pair of leg openings 12 at its lower end. The absorbent body 20 has a liquid-permeable topsheet 21 , a liquid-impermeable or liquid-repellent backsheet 23 , and an absorbent core 22 arranged between the topsheet 21 and the backsheet 23 . The absorbent body 20 is fixed to the wearer side of the exterior sheet 4 and absorbs excrement from the wearer. The rear pressing sheet 53 covers the upper end of the absorbent body 20 from the wearer's back side and is fixed to the exterior sheet 4 . The rear cushion sheet 6 is fixed at a position spaced upward from the absorbent core 22 between the rear pressing sheet 53 and the exterior sheet 4 . The rear cushion sheet 6 is thicker than the rear pressing sheet 53 and the exterior sheet 4. - 特許庁

The exterior sheet 4 includes a front portion 401 , a crotch portion 402 , a rear portion 403 , a trunk elastic member 44 , a leg elastic member 43 , and an intermediate elastic member 45 . The front part 401 is positioned on the abdomen of the wearer. The rear part 403 is positioned on the back side of the wearer and has both side ends connected to both side ends of the front part 401 . Crotch portion 402 continues from front portion 401 and rear portion 403 . The waist elastic member 44 extends laterally in the waist region along the edge 111 of the waist opening 11 and is joined to the front part 401 and the rear part 403 . The trunk elastic member 44 forms a trunk opening gather by contracting. The leg elastic members 43 are joined to the crotch part 402 along the edges 121 of the pair of leg openings 12 . The leg elastic members 43 contract to form a pair of leg opening gathers. The intermediate elastic member 45 extends in the horizontal direction in an intermediate elastic region between the body elastic member 44 and the leg elastic member 43 in the vertical direction, and is joined to the front portion 401 and the rear portion 403 . The intermediate elastic member 45 forms an intermediate gather by contracting. The rear cushion seat 6 is arranged at a position spaced downward from the trunk elastic member 44 and overlapped with the intermediate elastic member 45 in the thickness direction.

In the absorbent article 1, the contraction of the intermediate elastic member 45 in the left-right direction causes the rear cushion sheet 6 to contract in the left-right direction. A portion of the rear cushion sheet 6 protrudes toward the non-wearer side together with the rear pressing sheet 53, thereby forming a plurality of first vertical grooves 63 extending in the vertical direction. As a result, an air passage 65 surrounded by the skin on the back side of the wearer and the inner surfaces of the plurality of first longitudinal grooves 63 is formed. In addition, a part of the rear cushion sheet 6 is spaced apart from the outer sheet 4 and protrudes toward the wearer, thereby extending in the vertical direction and being alternately arranged with the plurality of first vertical grooves 63 in the horizontal direction. A plurality of second longitudinal grooves 64 are formed. As a result, a buffer space 66 surrounded by the wearer-side surface of the exterior sheet 4 and the inner surfaces of the plurality of second vertical grooves 64 is formed.

With the above configuration, the absorbent article 1 can improve the breathability and cushioning properties on the back side of the absorbent article 1 as described above. In addition, even when the wearer lies on his back and body pressure is applied to the rear cushion portion 60, it is possible to prevent the air passage 65 from collapsing. As a result, the wearing comfort of the absorbent article 1 can be improved.

The manufacturing method of the absorbent article 1 described above comprises a step of joining the non-wearer side surface of the absorbent body 20 to the exterior sheet 4 (step S12), and a step of joining the non-wearer side surface of the rear cushion sheet 6 and the non-wearer side surface of the rear pressing sheet 53 to the exterior sheet 4 after steps S12 and S13. (Step S14), and after step S14, the outer sheet 4 is folded at the crotch portion 402 together with the absorber 20, and both the left and right ends of the front portion 401 of the outer sheet 4 and the left and right ends of the rear portion 403 of the outer sheet 4 are folded. forming the body opening 11 and the pair of leg openings 12 (step S15). As a result, it is possible to prevent or suppress the fixed position of the rear cushion seat 6 on the exterior sheet 4 from deviating from the designed position. As a result, it is possible to easily form the absorbent article 1 with improved breathability and cushioning properties on the back side.

As described above, the rear pressing sheet 53 preferably covers the entire surface of the rear cushion sheet 6 facing the wearer. This prevents the rear cushion sheet 6 from coming into direct contact with the wearer's skin. As a result, it is possible to prevent the skin from becoming irritated due to direct contact with the rear cushion sheet 6, so that the wearing comfort of the absorbent article 1 can be further improved.

As described above, the lateral width of the rear cushion seat 6 is preferably larger than the lateral width of the upper end of the absorbent core 22 on the back side. As a result, moisture caused by water such as urine retained by the absorbent core 22 can be preferably absorbed into the absorbent article through the air passage 65 provided over the entire width of the absorbent core 22 on the back side of the wearer. 1 can be released to the outside. As a result, the wearing comfort of the absorbent article 1 can be further improved.

As described above, preferably, the wearer-side surface of the rear cushion sheet 6 is partially joined to the rear pressing sheet 53 by intermittently applied adhesive, and the non-wearer-side surface of the rear cushion sheet 6 is preferably is partially joined to the rear portion 403 of the exterior sheet 4 by intermittently applied adhesive. In addition, it is preferable that the adhesive coating area on the non-wearer side surface of the rear cushion sheet 6 is larger than the adhesive coating area on the wearer side surface of the rear cushion sheet 6 . As a result, the rear cushion sheet 6 can be firmly fixed to the outer sheet 4 while maintaining the texture of the absorbent article 1 on the wearer side (that is, while suppressing deterioration in touch due to stiffness or the like caused by the adhesive). can be done.

As described above, preferably, the wearer-side surface of the rear cushion sheet 6 is coated with the adhesive in stripes on a plurality of inner coating regions 61 extending in one of the lateral direction and the vertical direction. The non-wearer side surface of the rear cushion sheet 6 is partially joined to the rear pressing sheet 53 by the adhesive applied in stripes to a plurality of outer application areas 62 extending in the application direction. It is joined to the rear portion 403 of the exterior sheet 4 . In addition, the width of each outer application area 62 on the non-wearer side surface of the rear cushion sheet 6 in the direction perpendicular to the application direction is the same as the width of each inner application area 61 on the wearer side surface of the rear cushion sheet 6. It is preferably larger than the width in the direction perpendicular to the direction. As a result, the rear cushion sheet 6 can be firmly fixed to the outer sheet 4 while maintaining the texture of the absorbent article 1 on the wearer side (that is, while suppressing deterioration in touch due to stiffness or the like caused by the adhesive). can be done.

As shown in FIGS. 6 and 7, when the application direction of the inner application area 61 and the outer application area 62 is the horizontal direction, the application of the adhesive to the rear cushion sheet 6 can be facilitated. Also, as shown in FIGS. 8 and 9, when the application direction of the inner application area 61 and the outer application area 62 is the vertical direction, the adhesive will resist contraction of the rear cushion sheet 6 in the horizontal direction. is suppressed. As a result, the rear cushion seat 6 can be easily contracted in the left-right direction, and the air passage 65 and the buffer space 66 can be formed more favorably.

As described above, the intermediate elastic member 45 preferably includes a plurality of intermediate elastic elements 451 arranged vertically and each extending in the horizontal direction. In addition, the non-wearer side surface of the rear cushion sheet 6 is partially joined to the rear portion 403 of the outer sheet 4 by means of adhesive applied in stripes to a plurality of laterally extending outer application regions 62 . . One outer application region 62 on the non-wearer side surface of the rear cushion sheet 6 overlaps one or more intermediate elastic elements 451 in the thickness direction. As a result, the contractile force of the one or more intermediate elastic elements 451 is easily transmitted to the rear cushion seat 6, so that when the intermediate elastic member 45 is contracted, the rear cushion seat 6 is easily contracted in the left-right direction. As a result, the air passage 65 and the buffer space 66 can be formed more favorably.

As described above, more preferably, the wearer-side surface of the rear cushion sheet 6 is partially attached to the rear pressing sheet 53 by the adhesive applied in stripes to the plurality of inner application regions 61 extending in the left-right direction. spliced. One inner application area 61 on the wearer-side surface of the rear cushion sheet 6 overlaps the one or more intermediate elastic elements 451 in the thickness direction. As described above, the one or more intermediate elastic elements 451 overlap the inner application area 61 and the outer application area 62 in the thickness direction, so that the contractile force of the one or more intermediate elastic elements 451 is transmitted to the rear pressing sheet 53 as well. easier. As a result, when the intermediate elastic member 45 contracts, the rear pressing sheet 53 tends to contract in the left-right direction together with the rear cushion sheet 6 . Therefore, the ventilation path 65 can be formed more preferably.

As described above, preferably, the non-wearer side surface of the rear cushion sheet 6 is partially attached to the rear of the exterior sheet 4 by the adhesive applied in stripes to the plurality of outer application areas 62 extending in the left-right direction. It is joined to the portion 403 . A plurality of outer application areas 62 on the non-wearer side surface of the rear cushion sheet 6 are arranged so as to avoid the upper and lower ends of the rear cushion sheet 6 . As a result, the rear cushion seat 6 and the exterior sheet 4 are easily separated from each other in the thickness direction at the upper and lower ends of the rear cushion seat 6, and the buffer space 66 is easily formed. By forming the buffer space 66 in at least the upper end portion and the lower end portion of the rear cushion seat 6 in this manner, the cushioning property of the rear cushion portion 60 can be improved.

As described above, the cross-sectional area of the buffer space 66 perpendicular to the vertical direction is preferably larger than the cross-sectional area of the air passage 65 perpendicular to the vertical direction. Thereby, the cushioning property of the rear cushion portion 60 can be improved.

Various modifications can be made to the absorbent article 1 and the manufacturing method of the absorbent article 1 described above.

For example, the rear cushion sheet 6 may be joined to the exterior sheet 4 before being joined to the rear pressing sheet 53 . In this case, after joining the rear cushion sheet 6 and the exterior sheet 4 , the rear pressing sheet 53 is laminated on the rear cushion sheet 6 and the exterior sheet 4 and joined to the rear cushion sheet 6 and the exterior sheet 4 .

The outer application area 62 shown in FIG. 7 may be arranged at the upper end and/or the lower end of the rear cushion sheet 6 on the non-wearer side surface of the rear cushion sheet 6 . Also, the outer application areas 62 do not necessarily overlap the intermediate elastic elements 451 in the thickness direction, and each outer application area 62 may be arranged to avoid overlapping the intermediate elastic elements 451 in the thickness direction. Similarly, the inner application areas 61 shown in FIG. 6 do not necessarily overlap the intermediate elastic elements 451 in the thickness direction, and each inner application area 61 is arranged to avoid overlapping the intermediate elastic elements 451 in the thickness direction. may The inner coating region 61 does not necessarily have to overlap the outer coating region 62 in the thickness direction, and each inner coating region 61 may be arranged to avoid a position overlapping the outer coating region 62 in the thickness direction.

In the above example, the vertical width of the outer coating region 62 is larger than the vertical width of the inner coating region 61, but it may be smaller than the vertical width of the inner coating region 61, or substantially the same. may In addition, the adhesive coating area on the non-wearer side surface of the rear cushion sheet 6 may be smaller than the adhesive coating area on the wearer side surface of the rear cushion sheet 6, and may be substantially the same. may

The lateral width of the rear cushion seat 6 may be smaller than or substantially equal to the lateral width of the upper end of the absorbent core 22 on the back side.

The rear cushion sheet 6 does not necessarily need to be entirely covered with the rear pressing sheet 53, and a part of the rear cushion sheet 6 does not have to overlap the rear pressing sheet 53 in the thickness direction.

The structure of the absorbent article 1 described above may be used for pants-type disposable absorbent articles other than disposable diapers.

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

1 Absorbent Article 4 Exterior Sheet 6 Rear Cushion Sheet 11 Body Opening 12 Leg Opening 20 Absorber 21 Top Sheet 22 Absorption Core 23 Back Sheet 43 Leg Elastic Member 44 Body Elastic Member 45 Intermediate Elastic Member 53 Rear Pressing Sheet 61 Inner application area 62 Outer application area 63 First longitudinal groove 64 Second longitudinal groove 65 Ventilation channel 66 Buffer space 91 Skin 111 Edge (of trunk opening) 121 Edge (of leg opening) 401 Front part 402 Crotch part 403 Rear part 451 intermediate elastic element S11~S15 step

Claims (12)

A pants-type disposable absorbent article,
an exterior sheet having a trunk opening at its upper end and a pair of leg openings at its lower end;
It has a liquid-permeable top sheet, a liquid-impermeable or liquid-repellent back sheet, and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet. an absorbent body for absorbing exudates from the wearer;
a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the exterior sheet;
a rear cushion sheet that is thicker than the rear pressing sheet and the exterior sheet and fixed at a position spaced upward from the absorbent core between the rear pressing sheet and the exterior sheet;
with
The outer sheet is
a front part located on the wearer's ventral side;
a rear portion positioned on the back side of the wearer and having both side ends connected to both side ends of the front portion;
a crotch portion continuous from the front portion and the rear portion;
a waist elastic member that extends in the left-right direction in a waist circumference region along the edge of the waist opening, is joined to the front portion and the rear portion, and shrinks to form a waist opening gather;
leg elastic members that are joined to the crotch portion along edges of the pair of leg openings and contract to form a pair of leg opening gathers;
The intermediate gathers extend in the horizontal direction in the intermediate elastic region, which is the region between the trunk elastic member and the leg elastic member in the vertical direction, are joined to the front portion and the rear portion, and are shrunk to form intermediate gathers. forming an intermediate elastic member;
with
The rear cushion seat is arranged at a position spaced downward from the trunk elastic member and overlapping the intermediate elastic member in the thickness direction,
When the intermediate elastic member contracts in the left-right direction, the rear cushion sheet contracts in the left-right direction, and a part of the rear cushion sheet protrudes toward the non-wearer side together with the rear holding sheet, so that it extends vertically. A plurality of first longitudinal grooves extending along each of the plurality of longitudinal grooves are formed, forming an air passage surrounded by the wearer's dorsal skin and inner surfaces of the plurality of first longitudinal grooves, and forming a part of the rear cushion seat. is separated from the exterior sheet and protrudes toward the wearer, forming a plurality of second vertical grooves extending in the vertical direction and arranged alternately with the plurality of first vertical grooves in the horizontal direction. forming a buffer space surrounded by the wearer-side surface of the outer sheet and the inner surface of the plurality of second vertical grooves ,
The wearer-side surface of the rear cushion sheet is partially joined to the rear pressing sheet by intermittently applied adhesive,
The non-wearer-side surface of the rear cushion sheet is partially joined to the rear portion of the exterior sheet by intermittently applied adhesive,
A disposable absorbent article according to claim 1 , wherein the non-wearer-side surface of the rear cushion sheet is coated with the adhesive in a larger area than the wearer-side surface of the rear cushion sheet . A pants-type disposable absorbent article,
an exterior sheet having a trunk opening at its upper end and a pair of leg openings at its lower end;
It has a liquid-permeable top sheet, a liquid-impermeable or liquid-repellent back sheet, and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet. an absorbent body for absorbing exudates from the wearer;
a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the exterior sheet;
a rear cushion sheet that is thicker than the rear pressing sheet and the exterior sheet and fixed at a position spaced upward from the absorbent core between the rear pressing sheet and the exterior sheet;
with
The outer sheet is
a front part located on the wearer's ventral side;
a rear portion positioned on the back side of the wearer and having both side ends connected to both side ends of the front portion;
a crotch portion continuous from the front portion and the rear portion;
a waist elastic member that extends in the left-right direction in a waist circumference region along the edge of the waist opening, is joined to the front portion and the rear portion, and shrinks to form a waist opening gather;
leg elastic members that are joined to the crotch portion along edges of the pair of leg openings and contract to form a pair of leg opening gathers;
The intermediate gathers extend in the horizontal direction in the intermediate elastic region, which is the region between the trunk elastic member and the leg elastic member in the vertical direction, are joined to the front portion and the rear portion, and are shrunk to form intermediate gathers. forming an intermediate elastic member;
with
The rear cushion seat is arranged at a position spaced downward from the trunk elastic member and overlapping the intermediate elastic member in the thickness direction,
When the intermediate elastic member contracts in the left-right direction, the rear cushion sheet contracts in the left-right direction, and a part of the rear cushion sheet protrudes toward the non-wearer side together with the rear holding sheet, so that it extends vertically. A plurality of first longitudinal grooves extending along each of the plurality of longitudinal grooves are formed, forming an air passage surrounded by the wearer's dorsal skin and inner surfaces of the plurality of first longitudinal grooves, and forming a part of the rear cushion seat. is separated from the exterior sheet and protrudes toward the wearer, forming a plurality of second vertical grooves extending in the vertical direction and arranged alternately with the plurality of first vertical grooves in the horizontal direction. forming a buffer space surrounded by the wearer-side surface of the outer sheet and the inner surface of the plurality of second vertical grooves ,
The wearer-side surface of the rear cushion sheet is partially adhered to the rear pressing sheet by adhesive applied in stripes to a plurality of inner application areas extending in one of the lateral direction and the vertical direction. spliced,
The non-wearer-side surface of the rear cushion sheet is partially joined to the rear portion of the exterior sheet with an adhesive applied in stripes to a plurality of outer application regions extending in the application direction,
The width of each outer application area on the non-wearer side surface of the rear cushion sheet in the direction perpendicular to the application direction is the width of each inner application area on the wearer side surface of the rear cushion sheet perpendicular to the application direction. A disposable absorbent article characterized by being greater than its width in a direction . A pants-type disposable absorbent article,
an exterior sheet having a trunk opening at its upper end and a pair of leg openings at its lower end;
It has a liquid-permeable top sheet, a liquid-impermeable or liquid-repellent back sheet, and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet. an absorbent body for absorbing exudates from the wearer;
a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the exterior sheet;
a rear cushion sheet that is thicker than the rear pressing sheet and the exterior sheet and fixed at a position spaced upward from the absorbent core between the rear pressing sheet and the exterior sheet;
with
The outer sheet is
a front part located on the wearer's ventral side;
a rear portion positioned on the back side of the wearer and having both side ends connected to both side ends of the front portion;
a crotch portion continuous from the front portion and the rear portion;
a waist elastic member that extends in the left-right direction in a waist circumference region along the edge of the waist opening, is joined to the front portion and the rear portion, and shrinks to form a waist opening gather;
leg elastic members that are joined to the crotch portion along edges of the pair of leg openings and contract to form a pair of leg opening gathers;
The intermediate gathers extend in the horizontal direction in the intermediate elastic region, which is the region between the trunk elastic member and the leg elastic member in the vertical direction, are joined to the front portion and the rear portion, and are shrunk to form intermediate gathers. forming an intermediate elastic member;
with
The rear cushion seat is arranged at a position spaced downward from the trunk elastic member and overlapping the intermediate elastic member in the thickness direction,
When the intermediate elastic member contracts in the left-right direction, the rear cushion sheet contracts in the left-right direction, and a part of the rear cushion sheet protrudes toward the non-wearer side together with the rear holding sheet, so that it extends vertically. A plurality of first longitudinal grooves extending along each of the plurality of longitudinal grooves are formed, forming an air passage surrounded by the wearer's dorsal skin and inner surfaces of the plurality of first longitudinal grooves, and forming a part of the rear cushion seat. is separated from the exterior sheet and protrudes toward the wearer, forming a plurality of second vertical grooves extending in the vertical direction and arranged alternately with the plurality of first vertical grooves in the horizontal direction. forming a buffer space surrounded by the wearer-side surface of the outer sheet and the inner surface of the plurality of second vertical grooves ,
The non-wearer-side surface of the rear cushion sheet is partially joined to the rear portion of the exterior sheet by an adhesive applied in stripes to a plurality of laterally extending outer application areas,
The disposable absorbent article , wherein the plurality of outer application areas on the non-wearer-side surface of the rear cushion sheet are arranged avoiding upper and lower ends of the rear cushion sheet . A pants-type disposable absorbent article,
an exterior sheet having a trunk opening at its upper end and a pair of leg openings at its lower end;
It has a liquid-permeable top sheet, a liquid-impermeable or liquid-repellent back sheet, and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet. an absorbent body for absorbing exudates from the wearer;
a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the exterior sheet;
a rear cushion sheet that is thicker than the rear pressing sheet and the exterior sheet and fixed at a position spaced upward from the absorbent core between the rear pressing sheet and the exterior sheet;
with
The outer sheet is
a front part located on the wearer's ventral side;
a rear portion positioned on the back side of the wearer and having both side ends connected to both side ends of the front portion;
a crotch portion continuous from the front portion and the rear portion;
a waist elastic member that extends in the left-right direction in a waist circumference region along the edge of the waist opening, is joined to the front portion and the rear portion, and shrinks to form a waist opening gather;
leg elastic members that are joined to the crotch portion along edges of the pair of leg openings and contract to form a pair of leg opening gathers;
The intermediate gathers extend in the horizontal direction in the intermediate elastic region, which is the region between the trunk elastic member and the leg elastic member in the vertical direction, are joined to the front portion and the rear portion, and are shrunk to form intermediate gathers. forming an intermediate elastic member;
with
The rear cushion seat is arranged at a position spaced downward from the trunk elastic member and overlapping the intermediate elastic member in the thickness direction,
When the intermediate elastic member contracts in the left-right direction, the rear cushion sheet contracts in the left-right direction, and a part of the rear cushion sheet protrudes toward the non-wearer side together with the rear holding sheet, so that it extends vertically. A plurality of first longitudinal grooves extending along each of the plurality of longitudinal grooves are formed, forming an air passage surrounded by the wearer's dorsal skin and inner surfaces of the plurality of first longitudinal grooves, and forming a part of the rear cushion seat. is separated from the exterior sheet and protrudes toward the wearer, forming a plurality of second vertical grooves extending in the vertical direction and arranged alternately with the plurality of first vertical grooves in the horizontal direction. forming a buffer space surrounded by the wearer-side surface of the outer sheet and the inner surface of the plurality of second vertical grooves ,
The disposable absorbent article , wherein the cross-sectional area of the buffer space perpendicular to the vertical direction is larger than the cross-sectional area of the air passage perpendicular to the vertical direction . A disposable absorbent article according to any one of claims 1 to 4 ,
The disposable absorbent article, wherein the rear pressing sheet covers the entire surface of the rear cushion sheet facing the wearer. A disposable absorbent article according to any one of claims 1 to 5 ,
The disposable absorbent article, wherein the lateral width of the rear cushion sheet is larger than the lateral width of the upper end of the absorbent core on the back side. A disposable absorbent article according to any one of claims 1 to 6 ,
The intermediate elastic member includes a plurality of intermediate elastic elements arranged in the vertical direction and each extending in the horizontal direction,
The non-wearer-side surface of the rear cushion sheet is partially joined to the rear portion of the exterior sheet by an adhesive applied in stripes to a plurality of laterally extending outer application areas,
The disposable absorbent article, wherein the one outer application area on the non-wearer side surface of the rear cushion sheet overlaps with the one or more intermediate elastic elements in the thickness direction. A disposable absorbent article according to claim 7 ,
The wearer-side surface of the rear cushion sheet is partially joined to the rear pressing sheet by an adhesive applied in stripes to a plurality of inner application areas extending in the left-right direction,
The disposable absorbent article, wherein the one inner application area on the wearer-side surface of the rear cushion sheet overlaps the one or more intermediate elastic elements in the thickness direction. A method for manufacturing a pants-type disposable absorbent article, comprising:
an exterior sheet having a trunk opening at its upper end and a pair of leg openings at its lower end;
It has a liquid-permeable top sheet, a liquid-impermeable or liquid-repellent back sheet, and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet. an absorbent body for absorbing exudates from the wearer;
a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the exterior sheet;
a rear cushion sheet that is thicker than the rear pressing sheet and the exterior sheet and fixed at a position spaced upward from the absorbent core between the rear pressing sheet and the exterior sheet;
with
The outer sheet is
a front part located on the wearer's ventral side;
a rear portion positioned on the back side of the wearer and having both side ends connected to both side ends of the front portion;
a crotch portion continuous from the front portion and the rear portion;
a waist elastic member that extends in the left-right direction in a waist circumference region along the edge of the waist opening, is joined to the front portion and the rear portion, and shrinks to form a waist opening gather;
leg elastic members that are joined to the crotch portion along edges of the pair of leg openings and contract to form a pair of leg opening gathers;
The intermediate gathers extend in the horizontal direction in the intermediate elastic region, which is the region between the trunk elastic member and the leg elastic member in the vertical direction, are joined to the front portion and the rear portion, and are shrunk to form intermediate gathers. forming an intermediate elastic member;
with
The rear cushion seat is arranged at a position spaced downward from the trunk elastic member and overlapping the intermediate elastic member in the thickness direction,
When the intermediate elastic member contracts in the left-right direction, the rear cushion sheet contracts in the left-right direction, and a part of the rear cushion sheet protrudes toward the non-wearer side together with the rear holding sheet, so that it extends vertically. A plurality of first longitudinal grooves extending along each of the plurality of longitudinal grooves are formed, forming an air passage surrounded by the wearer's dorsal skin and inner surfaces of the plurality of first longitudinal grooves, and forming a part of the rear cushion seat. is separated from the exterior sheet and protrudes toward the wearer, forming a plurality of second vertical grooves extending in the vertical direction and arranged alternately with the plurality of first vertical grooves in the horizontal direction. forming a buffer space surrounded by the wearer-side surface of the outer sheet and the inner surface of the plurality of second vertical grooves,
The wearer-side surface of the rear cushion sheet is partially joined to the rear pressing sheet by intermittently applied adhesive,
The non-wearer-side surface of the rear cushion sheet is partially joined to the rear portion of the exterior sheet by intermittently applied adhesive,
The adhesive coating area on the non-wearer-side surface of the rear cushion sheet is larger than the adhesive coating area on the wearer-side surface of the rear cushion sheet,
The method for manufacturing the disposable absorbent article comprises:
a) joining the non-wearer-side surface of the absorbent body to the exterior sheet;
b) joining the wearer-side surface of the rear cushion sheet to the rear pressing sheet;
c) joining the non-wearer-side surface of the rear cushion sheet and the non-wearer-side surface of the rear pressing sheet to the exterior sheet after the steps a) and b);
d) After the step c), the exterior sheet is folded together with the absorbent body at the crotch portion to form both left and right ends of the front portion of the exterior sheet and both left and right ends of the rear portion of the exterior sheet. forming the body opening and the pair of leg openings by joining
A method of manufacturing a disposable absorbent article, comprising: A method for manufacturing a pants-type disposable absorbent article, comprising:
an exterior sheet having a trunk opening at its upper end and a pair of leg openings at its lower end;
It has a liquid-permeable top sheet, a liquid-impermeable or liquid-repellent back sheet, and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet. an absorbent body for absorbing exudates from the wearer;
a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the exterior sheet;
a rear cushion sheet that is thicker than the rear pressing sheet and the exterior sheet and fixed at a position spaced upward from the absorbent core between the rear pressing sheet and the exterior sheet;
with
The outer sheet is
a front part located on the wearer's ventral side;
a rear portion positioned on the back side of the wearer and having both side ends connected to both side ends of the front portion;
a crotch portion continuous from the front portion and the rear portion;
a waist elastic member that extends in the left-right direction in a waist circumference region along the edge of the waist opening, is joined to the front portion and the rear portion, and shrinks to form a waist opening gather;
leg elastic members that are joined to the crotch portion along edges of the pair of leg openings and contract to form a pair of leg opening gathers;
The intermediate gathers extend in the horizontal direction in the intermediate elastic region, which is the region between the trunk elastic member and the leg elastic member in the vertical direction, are joined to the front portion and the rear portion, and are shrunk to form intermediate gathers. forming an intermediate elastic member;
with
The rear cushion seat is arranged at a position spaced downward from the trunk elastic member and overlapping the intermediate elastic member in the thickness direction,
When the intermediate elastic member contracts in the left-right direction, the rear cushion sheet contracts in the left-right direction, and a part of the rear cushion sheet protrudes toward the non-wearer side together with the rear holding sheet, so that it extends vertically. A plurality of first longitudinal grooves extending along each of the plurality of longitudinal grooves are formed, forming an air passage surrounded by the wearer's dorsal skin and inner surfaces of the plurality of first longitudinal grooves, and forming a part of the rear cushion seat. is separated from the exterior sheet and protrudes toward the wearer, forming a plurality of second vertical grooves extending in the vertical direction and arranged alternately with the plurality of first vertical grooves in the horizontal direction. forming a buffer space surrounded by the wearer-side surface of the outer sheet and the inner surface of the plurality of second vertical grooves,
The wearer-side surface of the rear cushion sheet is partially adhered to the rear pressing sheet by adhesive applied in stripes to a plurality of inner application areas extending in one of the lateral direction and the vertical direction. spliced,
The non-wearer-side surface of the rear cushion sheet is partially joined to the rear portion of the exterior sheet with an adhesive applied in stripes to a plurality of outer application regions extending in the application direction,
The width of each outer application area on the non-wearer side surface of the rear cushion sheet in the direction perpendicular to the application direction is the width of each inner application area on the wearer side surface of the rear cushion sheet perpendicular to the application direction. greater than the width of the direction,
The method for manufacturing the disposable absorbent article comprises:
a) joining the non-wearer-side surface of the absorbent body to the exterior sheet;
b) joining the wearer-side surface of the rear cushion sheet to the rear pressing sheet;
c) joining the non-wearer-side surface of the rear cushion sheet and the non-wearer-side surface of the rear pressing sheet to the exterior sheet after the steps a) and b);
d) After the step c), the exterior sheet is folded together with the absorbent body at the crotch portion to form both left and right ends of the front portion of the exterior sheet and both left and right ends of the rear portion of the exterior sheet. forming the body opening and the pair of leg openings by joining
A method of manufacturing a disposable absorbent article, comprising: A method for manufacturing a pants-type disposable absorbent article, comprising:
an exterior sheet having a trunk opening at its upper end and a pair of leg openings at its lower end;
It has a liquid-permeable top sheet, a liquid-impermeable or liquid-repellent back sheet, and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet. an absorbent body for absorbing exudates from the wearer;
a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the exterior sheet;
a rear cushion sheet that is thicker than the rear pressing sheet and the exterior sheet and fixed at a position spaced upward from the absorbent core between the rear pressing sheet and the exterior sheet;
with
The outer sheet is
a front part located on the wearer's ventral side;
a rear portion positioned on the back side of the wearer and having both side ends connected to both side ends of the front portion;
a crotch portion continuous from the front portion and the rear portion;
a waist elastic member that extends in the left-right direction in a waist circumference region along the edge of the waist opening, is joined to the front portion and the rear portion, and shrinks to form a waist opening gather;
leg elastic members that are joined to the crotch portion along edges of the pair of leg openings and contract to form a pair of leg opening gathers;
The intermediate gathers extend in the horizontal direction in the intermediate elastic region, which is the region between the trunk elastic member and the leg elastic member in the vertical direction, are joined to the front portion and the rear portion, and are shrunk to form intermediate gathers. forming an intermediate elastic member;
with
The rear cushion seat is arranged at a position spaced downward from the trunk elastic member and overlapping the intermediate elastic member in the thickness direction,
When the intermediate elastic member contracts in the left-right direction, the rear cushion sheet contracts in the left-right direction, and a part of the rear cushion sheet protrudes toward the non-wearer side together with the rear holding sheet, so that it extends vertically. A plurality of first longitudinal grooves extending along each of the plurality of longitudinal grooves are formed, forming an air passage surrounded by the wearer's dorsal skin and inner surfaces of the plurality of first longitudinal grooves, and forming a part of the rear cushion seat. is separated from the exterior sheet and protrudes toward the wearer, forming a plurality of second vertical grooves extending in the vertical direction and arranged alternately with the plurality of first vertical grooves in the horizontal direction. forming a buffer space surrounded by the wearer-side surface of the outer sheet and the inner surface of the plurality of second vertical grooves,
The non-wearer-side surface of the rear cushion sheet is partially joined to the rear portion of the exterior sheet by an adhesive applied in stripes to a plurality of laterally extending outer application areas,
The plurality of outer application areas on the non-wearer-side surface of the rear cushion sheet are arranged to avoid upper and lower ends of the rear cushion sheet,
The method for manufacturing the disposable absorbent article comprises:
a) joining the non-wearer-side surface of the absorbent body to the exterior sheet;
b) joining the wearer-side surface of the rear cushion sheet to the rear pressing sheet;
c) joining the non-wearer-side surface of the rear cushion sheet and the non-wearer-side surface of the rear pressing sheet to the exterior sheet after the steps a) and b);
d) After the step c), the exterior sheet is folded together with the absorbent body at the crotch portion to form both left and right ends of the front portion of the exterior sheet and both left and right ends of the rear portion of the exterior sheet. forming the body opening and the pair of leg openings by joining
A method of manufacturing a disposable absorbent article, comprising: A method for manufacturing a pants-type disposable absorbent article, comprising:
an exterior sheet having a trunk opening at its upper end and a pair of leg openings at its lower end;
It has a liquid-permeable top sheet, a liquid-impermeable or liquid-repellent back sheet, and an absorbent core disposed between the top sheet and the back sheet, and is fixed to the wearer side of the exterior sheet. an absorbent body for absorbing exudates from the wearer;
a rear pressing sheet that covers the upper end of the absorbent body from the wearer's side on the back side of the wearer and is fixed to the exterior sheet;
a rear cushion sheet that is thicker than the rear pressing sheet and the exterior sheet and fixed at a position spaced upward from the absorbent core between the rear pressing sheet and the exterior sheet;
with
The outer sheet is
a front part located on the wearer's ventral side;
a rear portion positioned on the back side of the wearer and having both side ends connected to both side ends of the front portion;
a crotch portion continuous from the front portion and the rear portion;
a waist elastic member that extends in the left-right direction in a waist circumference region along the edge of the waist opening, is joined to the front portion and the rear portion, and shrinks to form a waist opening gather;
leg elastic members that are joined to the crotch portion along edges of the pair of leg openings and contract to form a pair of leg opening gathers;
The intermediate gathers extend in the horizontal direction in the intermediate elastic region, which is the region between the trunk elastic member and the leg elastic member in the vertical direction, are joined to the front portion and the rear portion, and are shrunk to form intermediate gathers. forming an intermediate elastic member;
with
The rear cushion seat is arranged at a position spaced downward from the trunk elastic member and overlapping the intermediate elastic member in the thickness direction,
When the intermediate elastic member contracts in the left-right direction, the rear cushion sheet contracts in the left-right direction, and a part of the rear cushion sheet protrudes toward the non-wearer side together with the rear holding sheet, so that it extends vertically. A plurality of first longitudinal grooves extending along each of the plurality of longitudinal grooves are formed, forming an air passage surrounded by the wearer's dorsal skin and inner surfaces of the plurality of first longitudinal grooves, and forming a part of the rear cushion seat. is separated from the exterior sheet and protrudes toward the wearer, forming a plurality of second vertical grooves extending in the vertical direction and arranged alternately with the plurality of first vertical grooves in the horizontal direction. forming a buffer space surrounded by the wearer-side surface of the outer sheet and the inner surface of the plurality of second vertical grooves,
the cross-sectional area of the buffer space perpendicular to the vertical direction is larger than the cross-sectional area of the air passage perpendicular to the vertical direction,
The method for manufacturing the disposable absorbent article comprises:
a) joining the non-wearer-side surface of the absorbent body to the exterior sheet;
b) joining the wearer-side surface of the rear cushion sheet to the rear pressing sheet;
c) joining the non-wearer-side surface of the rear cushion sheet and the non-wearer-side surface of the rear pressing sheet to the exterior sheet after the steps a) and b);
d) After the step c), the exterior sheet is folded together with the absorbent body at the crotch portion to form both left and right ends of the front portion of the exterior sheet and both left and right ends of the rear portion of the exterior sheet. forming the body opening and the pair of leg openings by joining
A method of manufacturing a disposable absorbent article, comprising:

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