CN213047731U - Pants-type absorbent article - Google Patents

Abstract

The pants-type absorbent article according to one embodiment of the present invention includes an absorbent body, a waist portion, and a crotch portion. The absorber is located at the crotch. The waist portion has a front side portion and a back side portion positioned at the waist portion, and at least one of the front side portion and the back side portion is formed of a composite sheet. The crotch portion is located between the front side portion and the back side portion, and holds the absorbent body together with the front side portion and the back side portion. The composite sheet has an elastic sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and a covering sheet which is less stretchable than the stretchable sheet and covers the notch.

Description

Pants-type absorbent article

Technical Field

The present invention relates to a pants-type absorbent article such as a disposable diaper.

Background

In a pants-type absorbent article such as a diaper including an absorbent body and an outer cover for fixing the absorbent body, a stretchable nonwoven fabric is used in a waist portion of the outer cover for the purpose of improving the fit to a wearer's waist. It is known that, in a pants-type absorbent article using such an extensible nonwoven fabric, a low-extensible region where elastic elements are cut is provided in a region of the extensible nonwoven fabric in the waist region, the region facing the absorbent body (see, for example, patent document 1). In such a configuration, since the stretchability of the stretchable nonwoven fabric is reduced in the region of the waist portion where the absorbent body is present, there is no case where the stretching of the stretchable nonwoven fabric acts on the absorbent body to cause wrinkles in the absorbent body, and the liquid-absorbing performance of the absorbent body is not impaired.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2010-57567

SUMMERY OF THE UTILITY MODEL

The pants-type absorbent article according to one embodiment of the present invention includes an absorbent body, a waist portion, and a crotch portion.

The absorber is located at the crotch.

The waist portion has a front side portion and a back side portion positioned at the waist portion, and at least one of the front side portion and the back side portion is formed of a composite sheet.

The crotch portion is located between the front side portion and the back side portion, and holds the absorbent body together with the front side portion and the back side portion.

The composite sheet has an elastic sheet including an elastic layer and a notch portion formed in a region facing the absorbent body; and a covering sheet which is less stretchable than the stretchable sheet and covers the notch.

Drawings

Fig. 1 is a perspective view of a disposable diaper according to a first embodiment of the present invention.

Fig. 2 is a plan view showing the developed state of the disposable diaper, and is a view seen from the outer surface side.

Fig. 3 is a sectional view of the disposable diaper taken along the line III-III of fig. 2.

Fig. 4 is a sectional view of the disposable diaper taken along the line IV-IV in fig. 2.

Fig. 5 is a plan view and a cross-sectional view of a stretchable sheet (first sheet) constituting the outer package of the disposable diaper.

Fig. 6 is a partially enlarged plan view of the disposable diaper, illustrating a state in which the cover sheet of the composite sheet is joined.

Fig. 7 is a partially enlarged plan view of the disposable diaper according to the second embodiment, illustrating a state in which the cover sheet of the composite sheet is joined.

Fig. 8 is a partial sectional view of a disposable diaper of the third embodiment.

Fig. 9 is a partially enlarged plan view of the disposable diaper according to the third embodiment, illustrating a state in which the cover sheet of the composite sheet is joined.

Fig. 10 is a plan view showing a developed state of the disposable diaper according to the fourth embodiment, as viewed from the outer surface side.

Fig. 11 is a plan view showing a developed state of the disposable diaper according to the fifth embodiment, as viewed from the outer surface side.

Fig. 12 is a partially enlarged plan view illustrating an outer shape of a waist panel constituting a part of an exterior body of a disposable diaper according to a fifth embodiment.

Fig. 13 is a partially enlarged plan view for explaining a modification of the pattern of the joint region of the composite sheet according to the sixth embodiment.

Fig. 14 is a partially enlarged plan view illustrating the shape of the notch portion of the waist panel of the disposable diaper including the separable outer covering according to the other embodiment.

Fig. 15 is a plan view illustrating the shape of a notch portion provided in a laminate sheet constituting a part of an outer cover of a disposable diaper including an integrated outer cover according to another embodiment.

Fig. 16 is a partially enlarged plan view illustrating a modification of the shape of the waist sheet or the cut-out portion of the exterior body according to another embodiment, and corresponds to the region S including the cut-out portion and its periphery, which is circled by a double-dashed line in fig. 14 and 15.

Detailed Description

The present invention relates to a pants-type absorbent article in which an outer body uses an extensible sheet, and the extension and contraction of the extensible sheet hardly acts on an absorber.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the drawings, an X axis, a Y axis, and a Z axis orthogonal to each other are shown as necessary.

< first embodiment >

[ integral Structure of Disposable diaper ]

Fig. 1 is a perspective view of a disposable diaper 100 according to a first embodiment of the present invention. The disposable diaper 100 is a pants-type absorbent article for capturing excrement of an infant as a wearer without leakage. The disposable diaper 100 includes an exterior body 110 and an absorbent body 120. The outer package 110 constitutes an outer package of the disposable diaper 100. The absorber 120 is held inside the outer package 110. That is, the outer package 110 is disposed on the outer surface (reference numeral 120a in fig. 4 described later) side which is the surface facing the skin side of the wearer when worn, and which is the surface facing the outside opposite to the skin side of the wearer when worn, that is, the surface facing the inside of the absorber 120 facing the skin side of the wearer when worn. Hereinafter, the inner side of each configuration indicates a side of the disposable diaper which is positioned on the skin side of the wearer when the disposable diaper is worn, and the outer side indicates a side opposite to the skin side of the wearer.

The outer package 110 includes a waist portion 111 and a crotch portion 112 formed continuously. The waist portion 111 forms a waist opening 130 and is disposed at the waist of the wearer. The waist portion 111 is configured to be stretchable and contractible in the girth direction so as to fit the waist of the wearer. The crotch portion 112 is located below the waist portion 111 in fig. 1 and is disposed at the crotch of the wearer.

The waist portion 111 has a front abdominal portion 111a disposed on the front side and a rear back portion 111b disposed on the rear side when worn. The front side portion 111a and the back side portion 111b are joined by, for example, heat sealing, ultrasonic sealing, or the like at side seal portions 113 provided at both ends in the width direction orthogonal to the front-back direction. Thus, the waist portion 111 is tubular, and a waist opening 130 is formed between the abdomen-side portion 111a and the back-side portion 111 b.

The crotch portion 112 is stretched between the stomach-side portion 111a and the back-side portion 111 b. The crotch unit 112 connects the front side portion 111a and the back side portion 111b so as to form a pair of leg openings 140 through which the legs of the wearer pass on both sides in the width direction. The crotch portion 112 is provided with leg gathers 114 including rubber threads 114a disposed along the leg openings 140. The leg gathers 114 are attached to the legs of the wearer passing through the leg openings 140 by the expansion and contraction of the rubber thread 114 a.

Fig. 2 is a plan view showing the developed state of the disposable diaper 100 of fig. 1, and is a view seen from the outer surface side. The disposable diaper 100 shown in fig. 2 is in a state shown in fig. 1 in which the side seals 113 are torn to separate the front side portion 111a and the back side portion 111b, and the outer package 110 and the absorbent body 120 are stretched along the XY plane.

In the disposable diaper 100 shown in fig. 2, the X-axis direction corresponds to the front-rear direction, the Y-axis direction corresponds to the width direction, and the Z-axis direction corresponds to the thickness direction. The circumferential directions of the ventral portion 111a and the dorsal portion 111b of the waist portion 111 in fig. 1 correspond to the width direction (Y-axis direction) in fig. 2. The disposable diaper 100 will be described below as shown in fig. 2.

The absorbent body 120 is configured to be able to trap excrement and to absorb liquid contained in the excrement. The absorber 120 is formed in a band shape and disposed in a wide range from the crotch portion 112 of the outer package 110 to the stomach-side portion 111a and the back-side portion 111b of the waist portion 111. Thus, in the disposable diaper 100, since the crotch of the wearer is covered with the absorber 120 over a wide range, even if the wearer moves, the excrement is hard to leak. In addition, the absorbent body 120 mainly absorbs liquid in the region of the crotch portion 112 where excrement is trapped. The liquid absorbed by the absorbent body 120 is not retained in this region but is absorbed toward the waist portion 111. That is, the absorbent body 120 can hold liquid over a wide range of the crotch portion 112 and the waist portion 111. Thus, in the disposable diaper 100, a sufficient amount of liquid can be absorbed by the absorber 120.

The exterior body 110 is made of the composite sheet 10. The composite sheet 10 includes a first sheet 11 as an extensible sheet, a second sheet (reference numeral 12 in fig. 3 described later), an adhesive layer (reference numeral 13 in fig. 3 described later), and a cover sheet 160. In the present embodiment, the second sheet 12 is provided to face the inside of the first sheet (stretch sheet) 11, and the first sheet 11 is positioned on the outer surface 110a side of the exterior body 110. The detailed structure of the composite sheet 10 will be described later.

The package 110 has an expansion/contraction region P. In the stretchable region P, the outer package 110 has stretchability in the girth direction (the width direction (Y-axis direction) in fig. 2). The waist portion 111, which requires stretchability in the girth direction, has a stretchable region P. The waist portion 111 of the outer package 110 has a facing region Q facing the absorber 120. In fig. 2, the expansion/contraction region P is indicated by a dot pattern having small dots, and the counter region Q is indicated by a dot pattern having large dots. As shown in fig. 2, the opposing region Q and the expansion region P partially overlap in a plan view.

The ventral portion 111a is formed of a composite sheet 10, and this composite sheet 10 has a cutout 115a formed in a laminated sheet (hereinafter, may be simply referred to as a laminated sheet) in which the first sheet 11 and the second sheet 12 are laminated with the adhesive layer 13 interposed therebetween, and a cover sheet 160a is disposed so as to cover this cutout 115 a. Similarly, the back side portion 111b is also constituted by the composite sheet 10 in which the notch 115b is formed in the laminated sheet and the cover sheet 160b is disposed so as to cover the notch 115 b. The notch 115a and the notch 115b have the same shape. Hereinafter, when it is not necessary to distinguish the notch 115a from the notch 115b, both will be referred to as the notch 115. The cover sheet 160a and the cover sheet 160b have congruent shapes. Hereinafter, when it is not necessary to distinguish between the cover sheet 160a and the cover sheet 160b, both will be referred to as cover sheet 160.

The outline 1151 of the laminate defining the notch 115 is rectangular in plan view. The contour 1151 is provided such that the length in the Y-axis direction (width direction) is shorter than the absorber 120. In addition, the length of the outline 1151 in the X-axis direction is the same as the substantially rectangular opposing region Q. That is, in a plan view, the outline of the laminate sheet defining the notch portion 115 is located in the facing region Q, one side of the rectangular outline 1151 overlaps one end portion of the absorbent body 120, and the remaining three sides are located in the existing region of the absorbent body 120. The outline 1151 portion of the laminate corresponds to the edge of the notch 115.

The notch 115 does not reach the peripheral edge of the waist opening 130 of the waist portion 111, but is formed in the laminate sheet with the peripheral edge left. Since the peripheral edge includes the first sheet 11, the disposable diaper 100 has the abdomen-side portion 111a and the back-side portion 111b each having the expansion/contraction region P over the entire Y-axis direction (width direction).

In the present embodiment, the shape of the notch 115 formed in the cover sheet 160 is rectangular, but the shape is not limited thereto. The cover sheet 160 may have a size and shape capable of covering at least the notch 115. The notch 115 is formed by cutting and removing the laminate sheet by a rotary cutter, a water jet cutter, an ultrasonic cutter, or the like in an extended state or a contracted state. The notch 115 may be formed by cutting the laminated sheet with a rotary cutter, a water jet cutter, an ultrasonic cutter, or the like, cutting a notch in the laminated sheet, and expanding the laminated sheet to enlarge the notch.

The cover sheet 160 and the laminate sheet are joined by thermal fusion at the joining region. Details of the joining region between the cover sheet 160 and the laminate sheet will be described later.

The cover sheet 160 has a rectangular shape having a contour larger than the contour 1151 of the laminated sheet defining the notch portion 115. Cover sheet 160 is disposed on outer surface 110a side of exterior body 110 and is disposed further outward than first sheet 11. The composite sheet 10 is formed of a single cover sheet 160 at the notch 115.

The cover sheet 160 may be made of any non-stretchable sheet that is less stretchable in the Y-axis direction than the first sheet 11. As the non-stretchable sheet constituting the cover sheet 160, for example, nonwoven fabric, woven fabric, paper, or the like can be used. For example, in order to obtain the same skin feel as the first sheet 11 that is the outer surface of the exterior body 110, the cover sheet 160 may be formed of a nonwoven fabric of the same type as the nonwoven fabric layer 11a of the first sheet 11 before the stretching process. The same type of nonwoven fabric means nonwoven fabrics produced by the same process as those of nonwoven fabrics such as hot air nonwoven fabric, hot roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric. Details of the first sheet 11 will be described later.

Fig. 3 is a sectional view of the disposable diaper 100 taken along the line III-III of fig. 2. Fig. 4 is a cross-sectional view of the disposable diaper 100 taken along the line IV-IV of fig. 2. Since the absorber 120 is not disposed at the position shown in fig. 3, fig. 3 shows only the outer package 110. On the other hand, since the absorber 120 is disposed at the position shown in fig. 4, fig. 4 shows the outer package 110 and the absorber 120.

The absorbent body 120 has an absorbent core 121, a core-spun sheet 122, a front sheet 123 and a back sheet 124. The absorbent core 121 is formed of a material having high water absorbency such as a fibrous material. As a fiber material forming the absorbent core 121, for example, defibered pulp, nonwoven fabric, or the like can be used. The absorbent core 121 may have a structure in which a water-absorbent polymer is held by a fibrous material.

The core-covering sheet 122 is configured as a covering member that houses the absorbent core 121 without separating the fiber material that constitutes the absorbent core 121. The topsheet 123 is disposed on the upper side of the absorbent core 121 in the Z-axis direction (thickness direction), and constitutes a contact surface that contacts the skin of the wearer. The back sheet 124 is disposed on the lower side of the absorbent core 121 in the Z-axis direction, and constitutes an adhesive surface to be bonded to the outer package 110 by the adhesive section 150.

The core sheet 122 and the face sheet 123 are made of a sheet having high liquid permeability. Therefore, in the absorbent body 120, the liquid contained in the excrement permeates the core sheet 122 and the topsheet 123 and is rapidly absorbed into the absorbent core 121. On the other hand, the back sheet 124 is made of a sheet having low liquid permeability. This can prevent liquid from leaking from the back sheet 124 to the outside in the absorber 120.

The outer body 110 including the waist portion 111 and the crotch portion 112 is composed of a composite sheet 10 including a first sheet 11, a second sheet 12, an adhesive layer 13 for bonding the first sheet 11 and the second sheet 12 to each other, and a cover sheet 160. The first sheet 11 constituting the composite sheet 10 is disposed on the outer side (lower side in the Z-axis direction in fig. 3 and 4), and the second sheet 12 is disposed on the inner side (upper side in the Z-axis direction in fig. 3 and 4). The first sheet 11 is a stretch sheet including an elastic layer, and more specifically, a stretch sheet including an elastic layer and a nonwoven fabric layer enclosing the elastic layer. The adhesive layer 13 is composed of a plurality of adhesive portions 131 arranged between the first sheet 11 and the second sheet 12. The adhesive layer 13 is composed of a plurality of adhesive portions 131 arranged at equal intervals in the circumferential direction of the waistline, for example. The detailed structure of the composite sheet 10 will be described later.

Fig. 3 and 4 correspond to cross-sectional views of the disposable diaper 100 in a state where the outer package 110 shown in fig. 2 is stretched along the XY plane, and therefore, in these drawings, the first sheet 11 as the stretch panel is shown in an extended state. In the state where the extended state of the first sheet 11 is released, the second sheet 12, which is a non-stretchable sheet, is folded at a portion not bonded by the bonding portion 131.

As shown in fig. 4, the disposable diaper 100 further includes an adhesive portion 150 disposed between the outer cover 110 and the absorbent body 120 to bond the outer cover 110 and the absorbent body 120. The structure of the adhesive section 150 may be arbitrarily determined so as to be able to join the outer cover 110 and the absorbent body 120, but is preferably a structure that does not hinder the breathability of the disposable diaper 100.

The adhesive section 150 has a planar outer shape having substantially the same size as the absorber 120 in a plan view, for example, and has a shape obtained by cutting out a portion corresponding to the notch 115. That is, in the aspect of the disposable diaper 100, the adhesive portion 150 is not disposed in the region corresponding to the notch portion 115. An adhesive such as a hot melt adhesive can be used for the adhesive part 150. For the arrangement of the adhesive, various printing methods, various transfer methods, and the like can be used, for example. The adhesive portion 150 may be formed by an adhesive member other than an adhesive.

As shown in fig. 4, the notch 115 is formed in the sheet in which the first sheet 11 and the second sheet 12 are laminated via the adhesive layer 13. As shown in fig. 2 and 4, the cover sheet 160 is disposed on the outer surface 110a side of the exterior body 110 so as to cover the notch 115. In the disposable diaper 100, only the cover sheet 160 is present outside the absorbent body 120 in the region corresponding to the notch 115. The absorbent body 120 and the cover sheet 160 are not directly joined, and the absorbent body 120 and the cover sheet 160 can be separated.

As shown in fig. 4, a hole is formed in the waist portion 111 by the notch 115. The central portion of the cover sheet 160 is curved so as to slightly enter the hole of the waist portion 111, and the region where the notch 115 is formed is slightly recessed when the outer body 110 is viewed from the outer surface 110a side. In other words, the cover sheet 160 is disposed on the opposite side of the first sheet (stretch sheet) 11 from the absorbent body 120, and is bent toward the absorbent body 120 at the notch 115.

The thickness of the cover sheet 160 is equal to or smaller than the thickness of the laminated sheet so that the thickness b of the region corresponding to the notch 115 in the entire surface of the composite sheet 10 is smaller than the thickness a of the first sheet 11, the second sheet 12, the adhesive layer 13, and the cover sheet 160, which overlap each other.

The thickness of the region of the composite sheet 10 where the cover sheet 160 is not disposed, that is, the thickness of the laminated sheet of the first sheet 11 and the second sheet 12 bonded by the adhesive layer 13, is preferably 0.3mm to 10mm, and more preferably 0.5mm to 4 mm. The thickness of the cover sheet 160 is preferably 0.1mm to 10mm, and more preferably 0.2mm to 4 mm. The thickness a of the laminate sheet and the cover sheet 160 superposed on each other is preferably 0.4mm to 10mm, and more preferably 0.5mm to 5 mm. The thickness b of the region of the composite sheet 10 corresponding to the notch 115 is preferably 0.3mm to 10mm, and more preferably 0.5mm to 4 mm. The thickness b is a length from the inner surface of the composite sheet 10 to the outer surface of the cover sheet 160 disposed in the cutout 115.

Thickness measurement the sheet was left without load for 2 days at 20. + -. 2 ℃ and 65. + -. 5% RH and then determined by the following method. First, in the case of a stretch sheet, the sheet is stretched 1.5 times in the stretching direction at 0.5cN/cm²Is clamped between the plates under load (in the case of a non-stretchable sheet, no stretching process is required). The cross section is observed with a microscope at a magnification of 50 to 200 times, and the average thickness is obtained in each field and is obtained as the average value of the thicknesses in the three fields (when the sheet has a high grammage part and a low grammage part, the high grammage part is taken as a measurement target).

[ detailed Structure of composite sheet ]

The first sheet 11, the second sheet 12, and the adhesive layer 13 constituting a part of the composite sheet will be described below.

(first sheet)

First, the structure of the first sheet 11 used in the composite sheet 10 will be described. Fig. 5 (a) is an enlarged plan view of the first sheet 11, schematically showing the structure of the first sheet 11. Fig. 5 (B) is a cross-sectional view taken along line VB-VB of fig. 5 (a) of the first sheet 11.

The first sheet 11 has a nonwoven fabric layer 11a extending along the XY plane and elastic yarns 11b enclosed in the nonwoven fabric layer 11 a. The nonwoven fabric layer 11a is formed of a nonwoven fabric made of fibers having low elasticity. The nonwoven fabric forming the nonwoven fabric layer 11a is not limited to a specific type, and may be, for example, a hot-air nonwoven fabric, a hot-roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, or the like.

The fibers constituting the nonwoven fabric layer 11a are not limited to specific types, and may be selected from chemical fibers such as polyethylene, polypropylene, polyester, and polyamide. The nonwoven fabric layer 11a may be formed of a composite fiber containing a plurality of chemical fibers. Further, natural fibers such as cotton and silk may be blended with the fibers constituting the nonwoven fabric layer 11 a.

The elastic wire 11b is a linear elastic body extending in the Y-axis direction. The elastic threads 11b are arranged at intervals in the X-axis direction in the waist portion 111, and constitute an elastic layer of the first sheet 11. The elastic wire 11b may be formed of an elastic material such as a thermoplastic elastomer or rubber. The elastic filaments 11b are particularly preferably formed of a thermoplastic elastomer which is easily fused with the fibers constituting the nonwoven fabric layer 11 a.

As the thermoplastic elastomer forming the elastic yarn 11b, for example, styrene-based elastomer, olefin-based elastomer, polyester-based elastomer, polyurethane-based elastomer, or the like can be used. The elastic wire 11b may be formed by combining a plurality of thermoplastic elastomers. The elastic yarn 11b may be a core-sheath type or a side-by-side type composite fiber.

In addition, the stretchable portions 11a1 and the connecting portions 11a2 extending in the X-axis direction are alternately arranged in the Y-axis direction in the first sheet 11. In the first sheet 11, the grammage of the nonwoven fabric layer 11a of the stretchable part 11a1 is lower than the grammage of the nonwoven fabric layer 11a of the connecting part 11a 2. Therefore, the expansion/contraction portion 11a1 is more easily deformed in the Y-axis direction than the connection portion 11a 2. In the nonwoven fabric layer 11a, strength is secured by the connecting portions 11a2 that are hard to deform.

In the extended state of the first sheet 11 of the waist portion 111, the first sheet 11 is extended mainly in the Y-axis direction at the stretchable and contractible portion 11a1 by applying a force to extend the first sheet in the Y-axis direction. That is, the first sheet 11 in the stretched state is not stretched substantially at the connecting portions 11a 2. The first sheet 11 in the extended state may be extended in the connecting portion 11a2 by a smaller amount than the stretchable portion 11a 1.

When the force for extending the first sheet 11 of the waist portion 111 in the Y-axis direction is released from the extended state, the first sheet contracts in the Y-axis direction by the elastic force of the elastic wires 11 b. In the contracted state of the first sheet 11, the dimension of the stretchable and contractible portion 11a1 in the Y axis direction is smaller than that of the first sheet 11 in the expanded state. Thus, the first sheet 11 is an extensible sheet extensible in the Y-axis direction.

As described above, in the composite sheet 10, the first sheet 11 itself can be stretched and contracted by the elastic force of the elastic wires 11 b. Therefore, in the composite sheet 10, the waist portion 111 of the outer cover 110 can be stretched in the girth direction in fig. 1 by the stretchability of the first sheet 11. Therefore, the composite sheet 10 may be configured without providing an elastic body such as a rubber thread between the first sheet 11 and the second sheet 12.

The first sheet 11 can be manufactured by any manufacturing method. For example, the first sheet 11 can be manufactured using the elastic threads 11b and two sheets of nonwoven fabric. In this manufacturing method, first, a laminate is formed by sandwiching the elastic yarn 11b in a molten state between two nonwoven fabrics. In this way, the nonwoven fabric and the elastic yarn 11b are welded to form the nonwoven fabric layer 11 a.

In the first sheet 11 at this stage, the basis weight of the nonwoven fabric layer 11a is constant, and the stretchable part 11a1 and the connecting part 11a2 are not formed. In order to form the stretchable and contractible portions 11a1 and the connecting portion 11a2 in the first sheet 11, for example, stretching in the Y-axis direction may be applied only to the stretchable and contractible portion 11a 1. This can reduce the grammage of the stretchable portion 11a1 while maintaining the grammage of the connecting portion 11a 2.

Any method may be used for the drawing process for forming the stretchable part 11a1 and the connecting part 11a2 in the first sheet 11, and for example, a roll drawing process using two grooved rolls that mesh with each other may be used. In this roll drawing process, the first sheet 11 is intermittently drawn by nipping the first sheet 11 between the rotating grooved rolls, and the stretchable portion 11a1 and the connecting portion 11a2 are alternately formed.

In this manufacturing method, the first sheet 11 can be manufactured without using an adhesive. Therefore, the first sheet 11 does not impair the texture of the nonwoven fabric layer 11a with the adhesive. In addition, the first sheet 11 does not impair the texture of the nonwoven fabric layer 11a by the elastic filaments 11b contained in the nonwoven fabric layer 11 a. Therefore, the soft touch of the nonwoven fabric layer 11a can be obtained as it is in the first sheet 11. Since the first sheet 11 is formed by fusing the nonwoven fabric and the elastic threads 11b sandwiched between the nonwoven fabric, the elastic threads 11b are contained in the nonwoven fabric layer 11a without being exposed on the surface of the nonwoven fabric layer 11a, and the first sheet 11 is configured to be stretchable in 1 sheet.

The first sheet 11, which is the stretchable sheet containing an elastic layer, is a nonwoven fabric layer in which elastic fibers (elastic filaments) are included as an elastic layer, but is not limited thereto. For example, the first sheet 11 may be a stretchable sheet enclosing an elastic film, and the elastic film may constitute an elastic layer. The elastic film is made of a thermoplastic elastomer or the like, and has elasticity itself. As a stretch sheet using such an elastic film, for example, a stretch sheet in which an elastic film is laminated between two nonwoven fabric layers as described in japanese patent application laid-open No. 2017-64361 can be used.

The elastic layer of the nonwoven fabric layer included in the first sheet 11 may be, for example, elastic fibers made of short fibers. The elastic fibers are arranged so that the elastic fibers extend in one direction without crossing each other, but when elastic fibers made of short fibers are used, the elastic fibers may be arranged randomly or may be arranged so as to be oriented in any one direction.

The first sheet 11 may be an elastic sheet made of a nonwoven fabric formed by blending (mixing) elastic fibers and inelastic fibers. In this case, in the stretch panel, the elastic fibers constitute the elastic layer, and a part of the elastic fibers is wrapped in the nonwoven fabric layer. The first sheet 11, which is most preferably a stretchable sheet including an elastic layer, is a nonwoven fabric layer including an elastic layer formed by stretching a laminate in which elastic yarns are sandwiched between the two nonwoven fabrics.

With these configurations, the nonwoven fabric layer 11a can be welded to the elastic layer, and therefore the first sheet 11 can be manufactured without using an adhesive.

(second sheet)

The second sheet 12 constituting a part of the composite sheet 10 may be made of any non-stretchable sheet that is difficult to stretch in the Y-axis direction. As the non-stretchable sheet constituting the second sheet 12, for example, a nonwoven fabric, a woven fabric, paper, or the like can be used. For example, the second sheet 12 may be formed of a nonwoven fabric using the same fibers as the nonwoven fabric layer 11a of the first sheet 11 in order to obtain the same skin feel as the first sheet 11.

(adhesive layer)

The first sheet 11 and the second sheet 12 are bonded by an adhesive layer 13 including a plurality of adhesive portions 131 arranged in a long and narrow stripe shape extending in the X axis direction at equal intervals in the XY plane between the sheets. The pattern shape of the adhesive layer 13 is not limited to this.

The adhesive layer 13 is typically formed of an adhesive. As a method for forming the adhesive layer, for example, various printing methods, various transfer methods, and the like can be used. As the printing method, for example, gravure printing, letterpress printing, offset printing, or the like can be used. As the transfer method, for example, roller transfer, thermal transfer, or the like can be used. As the adhesive for forming the adhesive layer 13, a hot melt adhesive can be used. The adhesive layer 13 may be formed of various adhesives such as a thermoplastic adhesive and a reactive adhesive, in addition to the hot-melt adhesive. The adhesive layer 13 may be formed of various adhesive members other than an adhesive. Examples of such adhesive members include sheet-like members having adhesiveness on both sides, such as double-sided tapes.

The adhesive layer 13 is preferably disposed on the first sheet 11 in an extended state. An adhesive layer 13 is disposed on the first sheet 11 in an elongated state, and the first sheet 11 and the second sheet 12 are bonded together to form a laminated sheet in which the first sheet 11 and the second sheet 12 are laminated. After the notch 115 is formed in the laminated sheet, the cover sheet 160 is disposed so as to cover the notch 115 with the cover sheet 160, and the cover sheet 160 and the laminated sheet are joined to form the composite sheet 10.

[ detailed Structure of junction region ]

Fig. 6 is a partially enlarged plan view of the back side portion 111b of the waist portion 111 of the outer package 110, and is a view illustrating a state of a joint region between the cover sheet 160b and the laminate sheet in the composite sheet 10. The state of the bonded region between the cover sheet 160a and the laminate sheet around the notch 115a of the stomach-side portion 111a is also the same as that in fig. 6.

The cover sheet 160b has a rectangular shape larger than the outline 1151 of the laminated sheet defining the notch portion 115b so as to cover the notch portion 115 b. By making the cover sheet 160b larger than the notch 115b, the joint area between the two is ensured, and the cover sheet 160b can be disposed so as to reliably cover the notch 115b even if a positional deviation occurs when the cover sheet 160b is attached to the laminated sheet.

Composite sheet 10 has a joining region 170 along contour 1601 of clad sheet 160 b. In the joining region 170, the cover sheet 160b and the laminate sheet overlap each other. Joining region 170 includes joining portion 171 where cover sheet 160b and the laminate sheet are heat-welded, and non-joining portion 172 where the cover sheet and the laminate sheet are not heat-welded. The laminate sheet and the cover sheet 160b are joined by thermal welding at a joining portion 171 of a rectangular frame-shaped joining region 170. The joining portion 171 can be formed by, for example, embossing heat-sealing using an embossed convex roller and a flat roller, heat-sealing by heat-sealing, or the like.

The outline of the inner periphery of the frame-shaped joining region 170 is slightly larger than the outline 1151 of the laminated sheet defining the notch 115 in plan view. The contour of the outer periphery of joining region 170 is set slightly smaller than contour 1601 of cover sheet 160 b.

In the joining region 170, the non-joining portions 172 are arranged in a checkered pattern which is discontinuous in any direction. The occupancy rate of the joint 171 in the joint region 170 is 50%.

[ Effect of the present embodiment ]

In the present embodiment, a cutout 115 is formed in a region of the first sheet (stretch sheet) 11 constituting the waist portion 111 of the outer package 110 facing the absorbent body 120. The cover sheet 160 is disposed so as to cover the notch 115, and the cover sheet 160 is less likely to expand or contract than the first sheet (stretchable sheet) 11. In the disposable diaper 100, since the notch 115 is provided, there is no stretchable region in the region of the waist portion 111 facing the absorber 120. This makes it difficult for the force accompanying the expansion and contraction of the waist portion 111 to act on the absorber 120, and thus deformation of the absorber 120 can be suppressed. Thus, since the stretching force of the waist portion 111 is less likely to be applied to the absorbent body 120 and the absorbent body 120 is less likely to be wrinkled, the appearance and the absorption performance of the disposable diaper are not impaired by the wrinkling of the absorbent body 120, and good appearance and absorption performance can be ensured.

In the present embodiment, the disposable diaper 100 is configured such that the first sheet (stretch panel) 11 is present over the entire waist-circumference direction of the waist portion 111, and the abdomen-side portion 111a and the back-side portion 111b are provided with the first sheet (stretch panel) 11 over the entire Y-axis direction thereof. This improves the fit to the waist of the wearer. Further, the waist portion 111 is easily brought into close contact with the waistline of the wearer, and leakage of excrement of the wearer from the waistline is suppressed.

In the present embodiment, composite sheet 10 is formed of a single cover sheet 160 at notch 115. That is, in the disposable diaper 100, only the cover sheet 160 is present outside the absorbent body 120 in the region corresponding to the notch 115. This provides good air permeability and a soft touch.

In the present embodiment, the cover sheet 160 is disposed on the opposite side of the first sheet (stretch sheet) 11 from the absorbent body 120 side, and is bent toward the absorbent body 120 side at the notch 115. The thickness of the cover sheet 160 is equal to or smaller than the thickness of the laminate sheet so that the thickness b of the region of the composite sheet 10 in the waist portion 111 corresponding to the notch portion 115 is smaller than the thickness a of the region where the cover sheet 160 and the laminate sheet overlap. Thus, in the outer cover 110 including the waist portion 111, since the variation in thickness in the plane of the composite sheet 10 is small, the texture and the tactile sensation can be uniform in the outer surface 110a of the outer cover 110.

In the present embodiment, cover sheet 160 is disposed on outer surface 110a side of outer package 110, and cover sheet 160 and the laminate sheet are joined to each other in joining region 170 provided along outline 1601 of cover sheet 160. In this way, since joining region 170 is provided along outline 1601 of cover sheet 160, the end of cover sheet 160 is difficult to curl. Therefore, cover sheet 160 is less likely to peel off from the portion that is less likely to curl, and exterior body 110 can have an appearance that is similar to the appearance that cover sheet 160 and first sheet 11 are integrated.

In the present embodiment, the non-joined portions 172 are arranged in a discontinuous pattern in any direction in the joined region 170 of the composite sheet 10. Thereby, the laminated sheet of the cover sheet 160, the first sheet 11, and the second sheet 12 is joined along the joining region 170 without a gap, thereby suppressing leakage of excrement from the joining region 170.

The occupancy rate of the joint 171 in the joint region 170 is preferably 40% to 60%, and in the present embodiment, 50%. By setting the occupancy of the bonding portion 171 with respect to the bonding region 170 to 40% or more, a sufficient bonding force can be ensured. By setting the occupancy rate of the joint 171 to 60% or less with respect to the joint region 170, a uniform texture can be maintained on the outer surface of the outer package 110, and a good tactile sensation can be provided.

< other embodiment >

In the disposable diapers according to the second to sixth embodiments described below as another embodiment, similarly to the first embodiment, a notch portion is formed in a region of the first sheet (stretch sheet) constituting the waist portion of the outer covering body, the region facing the absorbent body. The cover sheet is disposed so as to cover the notch portion, and is less stretchable than the first sheet (stretchable sheet). In such a disposable diaper, since the force accompanying the expansion and contraction of the waist portion is less likely to act on the absorber, the deformation of the absorber can be suppressed. In this way, since the stretching force of the waist portion is not easily applied to the absorbent body and the absorbent body is not easily wrinkled, the appearance and the absorption performance of the disposable diaper are not impaired by the wrinkling of the absorbent body, and good appearance and absorption performance can be ensured.

In the following second to sixth embodiments, as in the first embodiment, the first sheet (stretch panel) is provided over the entire waist circumference direction of the waist portion in the disposable diaper state, and the abdomen-side portion and the back-side portion have the first sheet (stretch panel) over the entire Y-axis direction thereof. This improves the fit to the waist of the wearer. In addition, the waist portion is easily attached to the waist of the wearer, and leakage of excrement from the waist of the wearer is suppressed.

In the following second to sixth embodiments, as in the first embodiment, the joint region between the laminate sheet and the cover sheet includes a joint portion and a non-joint portion. In addition, in the bonding region, the occupancy ratio of the bonding portions is 40% or more and 60% or less, and the non-bonding portions are arranged in a pattern that is discontinuous in any direction. This ensures sufficient bonding force, and can provide good texture and skin feel.

Hereinafter, the second to sixth embodiments will be described, mainly with respect to differences from the first embodiment, and the same components will be given the same names and symbols, and description thereof may be omitted.

< second embodiment >

In the first embodiment, an example is given in which a heat-welding treatment region for performing heat-welding treatment for joining is set in a region where the cover sheet and the laminate sheet overlap each other. In contrast, in the second embodiment, an example will be described in which the bonding area and the heat-fusion-processed area do not coincide with each other by providing the heat-fusion-processed area across the contour of the cover sheet.

Fig. 7 is a diagram illustrating a state of a bonding region between the cover sheet 160b and the laminate sheet according to the present embodiment. In fig. 7, a specific bonding pattern of the bonding region is omitted.

In the present embodiment, as shown in fig. 7, heat-fusion-processed region 1701 is provided across outline 1601 of cover sheet 160. The heat welding region 1701 is a region where heat welding for bonding is performed. In fig. 7, a heat-welding region 1701 is a region surrounded by a one-dot chain line and is indicated by a dot pattern. The heat-welding processing region 1701 can be divided into a first region located on the outer side and a second region located on the inner side, which is the bonding region 170, by the outline 1601 as a boundary.

By providing heat weld process area 1701 across profile 1601 of cover sheet 160, heat weld process area 1701 has an area where the laminate sheet and cover sheet overlap and an area where only the cover sheet is present. The region where the laminate sheet and the cover sheet overlap is a joining region 170 where the laminate sheet and the cover sheet are joined, and the region where only the cover sheet is joined is a region not involved in joining.

As shown in fig. 7, the outline of the inner periphery of the frame-shaped heat-welding processing region 1701 is slightly larger than the outline 1151 of the laminate sheet defining the notch 115 in plan view. Heat-fusion-treated region 1701 has an outer periphery slightly larger in contour than contour 1601 of cover sheet 160 and is provided so as to surround cover sheet 160. Heat-fusion treatment area 1701 is provided across outline 1601 of cover sheet 160, and bonding area 170 is provided along outline 1601 of cover sheet 160 without a space from outline 1601.

In the present embodiment, the region where the laminate sheet and the cover sheet overlap in the heat-fusion treated region 1701 is a joining region 170. The second region of the heat-fusion-processed region 1701 located on the inner side with the outline 1601 as a boundary is a bonding region 170. Thus, the heat welding processing region 1701 and the bonding region 170 do not coincide.

In the case where the heat-welding treatment region 1701 is provided across the region where the laminate sheet and the cover sheet 160 overlap and the region where only the laminate sheet is present, the non-bonded part 172 is discontinuous in any direction in the bonded region 170 in the region where the laminate sheet and the cover sheet overlap, and the condition that the occupation ratio of the bonded part 171 in the bonded region 170 is 40% or more and 60% or less may be satisfied. For example, the pattern formed in the heat-fusion-processed region 1701 by the heat fusion process may be a checkered pattern as shown in the first embodiment in which the heat-processed portion and the portion that is not heat-processed are formed. The heat-treated portion becomes a joint portion when the two sheets overlap, and the portion not heat-treated becomes a non-joint portion when the two sheets overlap. When heat-fusion-treated region 1701 straddles outline 1601 of cover sheet 160 and is treated in such a checkered heat treatment pattern, the above-described condition for bonding region 170 may be satisfied in the region where the laminated sheet and cover sheet overlap.

As described above, in the present embodiment, since cover sheet 160 is bonded to heat-fusion-treated region 1701 straddling outline 1601 of cover sheet 160, bonding region 170 is not provided along outline 1601 of cover sheet 160 at a distance from outline 1601. Thus, on the outer surface side of outer package 110, outline 1601 of cover sheet 160 is less likely to curl, cover sheet 160 is less likely to peel off from the curl, and outer package 110 having an appearance similar to that in which cover sheet 160 is integrated with first sheet 11 can be obtained.

< third embodiment >

In the first embodiment, the cover sheet is disposed on the outer surface side of the outer package, but as in the third embodiment described below, the cover sheet may be disposed on the inner surface side of the outer package. This embodiment will be described with reference to fig. 8 and 9. In the present embodiment, the arrangement position of the cover sheet, the shape of the bonding portion for bonding the absorbent body and the outer package, and the position of the heat-fusion-treated region are different from those of the first embodiment.

Fig. 8 is a partial sectional view of the disposable diaper 200 of the present embodiment. Fig. 8 is a partial cross-sectional view of the waist portion 211 where the absorbent body 120 is disposed, at the back side portion 211b, and shows the exterior body 210 and the absorbent body 120. The same applies to the ventral portion.

Fig. 9 is a partially enlarged plan view of the back side portion 211b of the waist portion 211 of the outer covering 210 of the disposable diaper 200, illustrating the position of the joint region between the cover sheet 260 and the composite sheet 10 around the notch 115 b. In fig. 9, a heat welding region 1701 is a region surrounded by a one-dot chain line and is indicated by a dot pattern. The heat-welding processing region 1701 may be divided into a first region located on the outer side and a second region located on the inner side by the outline 1601, and the first region is the bonding region 170. In fig. 9, illustration of a specific bonding pattern of the bonding region is omitted.

The outer body 210 is formed by a waist portion 211 and a crotch portion 212 formed continuously. The outer shape of the package 210 is the same as that of the first embodiment. In the present embodiment, the waist portion 211 also has the stretchable region P. In addition, the waist portion 211 has an opposing region Q opposing the absorber 120.

The exterior body 210 is made of a composite sheet 280. The composite sheet 280 has a first sheet 11, a second sheet 12, an adhesive layer 13, and a cover sheet 260. In the laminated sheet of the first sheet 11 and the second sheet 12 laminated via the adhesive layer 13, a notch 115 is formed in an opposing region Q of the waist portion 211 that faces the absorber 120. The notch 115 is formed in each of the ventral portion and the dorsal portion of the waist portion 211. The notch 115 is covered with a cover sheet 260.

The cover sheet 260 is disposed between the laminate sheet including the first sheet (stretch sheet) 11 and the absorbent body 120 in the Z-axis direction (thickness direction) of the disposable diaper 200. That is, cover sheet 260 is disposed on inner surface 210b side of exterior body 210. The adhesive section 250 that bonds the outer package 210 and the absorbent body 120 has a planar outer shape having substantially the same size as the absorbent body 120, for example.

The cover sheet 260 of the outer package 210 and its peripheral portion are bonded to the outer surface 120a side of the absorbent body 120 via the adhesive portion 250 disposed on the outer surface 120a side of the absorbent body 120. The same adhesive material as that used for the adhesive part 150 described above can be used for the adhesive part 250. In addition, the adhesive may be formed by the same method as that for the adhesive portion 150.

The laminate sheet and the cover sheet 260 are joined by thermal fusion at the joining portion of the rectangular frame-shaped joining region 170. The joining region 170 is provided along the notch portion 115 of the laminate sheet. In the present embodiment, a heat-welding treatment region 1701 is provided across the outline 1151 of the notch portion 115. By providing the heat-welding processing region 1701 across the outline 1151 of the cutout portion, the heat-welding processing region 1701 has a region where the laminate sheet and the cover sheet overlap and a region where only the cover sheet exists. The region where the laminate sheet and the cover sheet overlap is a joining region 170 where both are joined, and the region where only the cover sheet is joined is a region involved in the joining.

As shown in fig. 9, an inner edge portion of the frame-shaped heat-fusion-processed region 1701 is located inside the notch portion 115 in a plan view. The outer edge portion of the heat-fusion-treated region 1701 is smaller than the rectangular outline 2601 of the cover sheet 260 and is provided so as to surround the outline 1151 of the laminate sheet defining the notch 115. By providing the heat-welding treatment region 1701 across the outline 1151 of the laminate sheet defining the notch portion 115 of the notch portion 115, the welding region 170 is provided along the outline 1151 of the notch portion 115 without being spaced from the outline 1151.

As described above, in the present embodiment, since cover sheet 260 is bonded in heat-fusion-treated region 1701 across outline 1151 of the laminate sheet defining cutout portion 115, when outer package 210 is viewed from outer surface 210a side, bonding region 170 is provided along outline 1151 of the laminate sheet defining cutout portion 115 without being spaced apart from outline 1151. This makes it difficult for a gap to be formed between cover sheet 260 and the laminated sheet on outer surface 210a of outer package 210, and outer package 210 can have an appearance similar to that of cover sheet 160 integrated with first sheet 11.

As described above, the heat welding processing region 1701 includes a region where the cover sheet 160 and the laminate sheet overlap each other and a region where only the laminate sheet is present. In such a configuration, the region where the cover sheet 160 and the laminate sheet overlap each other is a joining region 170 where the cover sheet 160 and the laminate sheet are joined, and the heat-welding processing region does not coincide with the joining region 170. The joining region 170 is provided along the notch 115 of the laminate sheet.

In the present embodiment, as in the second embodiment, when the heat-fusion treatment region 1701 does not coincide with the bonding region 170, the non-bonding portions 172 may be formed in a discontinuous pattern in any direction in the bonding region 170 in the region where the laminate sheet and the cover sheet overlap, and the occupancy rate of the bonding portions 171 in the bonding region 170 may be 40% to 60%.

In addition, although the present embodiment exemplifies that the heat-fusion-processed region 1701 spans the notch portion 115, the heat-fusion-processed region may be joined so as to be located in a region where the laminate sheet and the cover sheet overlap each other, as in the first embodiment. In this case, the heat-fusion-processed region and the bonding region are identical.

In addition, the composite sheet 280 of the present embodiment is formed of a single cover sheet 260 at the notch portion 115. That is, in the disposable diaper 200, only the adhesive portion 250 and the cover sheet 260 are present outside the absorbent body 120 in the region corresponding to the notch portion 115. This makes the counter region Q more breathable and soft to the touch than the case where the notch 115 is not formed.

< fourth embodiment >

In the above embodiments, the notch portion is provided in each of the front and back side portions, and two notch portions are provided in total. As in the fourth embodiment described below, a single notch may be provided in a region of the outer covering including the waist portion and the crotch portion corresponding to the absorbent body. The present embodiment will be described below with reference to fig. 10. This embodiment differs from the first embodiment mainly in the shape and number of the notch portions and the shape of the cover sheet.

Fig. 10 is a developed plan view of the disposable diaper 300 of the present embodiment, as viewed from the outer surface 310a side of the outer covering 310. The disposable diaper 300 includes an outer package 310 and an absorber 120. The outer package 310 constitutes the outer package of the disposable diaper 300. The absorber 120 is held inside the outer package 310. That is, the outer package 310 is disposed on the outer surface 120a side of the absorber 120.

The outer package 310 is composed of a waist portion 311 and a crotch portion 312 continuously formed by composite sheets. The waist portion 311 has a front side portion 311a disposed on the front side in the X-axis direction (front-rear direction) and a rear side portion 311b disposed on the rear side in the X-axis direction (front-rear direction). The front side portion 311a and the back side portion 311b are joined by, for example, heat sealing, ultrasonic sealing, or the like at side seal portions 313 provided at both ends in the Y-axis direction.

The exterior body 310 has an expansion/contraction region P. In the stretchable region P, the package 310 has stretchability in the Y-axis direction. The waist portion 311, which requires stretchability in the girth direction, has a stretchable region P. In addition, the outer package 310 also has an expansion region P in the crotch portion 312. The waist portion 311 and the crotch portion 312 of the outer package 310 have a facing region Q facing the absorber 120. As shown in fig. 10, the opposing region Q and the telescopic region P partially overlap each other in a plan view.

The outer package 310 is composed of a composite sheet 380. The composite sheet 380 includes a first sheet 11 as an extensible sheet, a second sheet, an adhesive layer, and a cover sheet 360. In the laminated sheet in which the first sheet 11 and the second sheet are laminated via the adhesive layer, the notch 315 is formed in the facing region Q facing the absorber 120. The notch 315 is formed continuously across the stomach-side portion 311a, the crotch portion 312, and the back-side portion 311 b. The cover sheet 360 is disposed from the stomach-side portion 311a to the back-side portion 311b via the crotch portion 312, and covers the notch 315.

In the present embodiment, an example is given in which the cover sheet 360 is disposed on the outer surface 310a side of the outer package 310, but may be disposed between the first sheet and the absorbent body in the thickness direction and on the inner surface side of the outer package as in the second embodiment. The width of the notch 315 in the Y axis direction is narrower than the absorbent body 120, and the total length in the X axis direction is substantially the same as the absorbent body 120. The absorbent body 120 and the outer package 310 are bonded together by a bonding portion formed of an adhesive or the like, for example, provided in a region where the outer package 310 and the absorbent body 120 overlap each other in a plan view, and a region where the notch 315 is not formed. Specifically, the adhesive portions may be formed in a band shape extending in the X-axis direction at both side ends in the width direction of the absorber 120.

In this way, one notch 315 may be formed in the region of the laminate sheet facing the absorbent body 120, and the manufacturing is easier than the case of forming two notches in the above-described embodiment.

In the present embodiment, since the cutout 315 is also provided in the opposing region Q of the stretchable crotch portion 312 facing the absorbent body 120, the force caused by the stretching of the crotch portion 312 is less likely to act on the absorbent body 120 in the crotch portion 312, as in the case of the waist portion 311. Therefore, in the present embodiment, the force accompanying the expansion and contraction of the outer package 310 is less likely to act on the absorber 120, and deformation of the absorber 120 can be suppressed.

In the present embodiment, as in the first embodiment, in the disposable diaper 300, only the cover sheet 360 is present outside the absorbent body 120 in the region corresponding to the notch 315. This provides good air permeability and a soft touch.

< fifth embodiment >

The disposable diapers according to the above embodiments are all integrated outer packages formed using a composite sheet in which a waist portion and a crotch portion are continuously formed, but are not limited thereto. As in the present embodiment, a split-type exterior body may be formed by bonding an abdominal sheet, a crotch sheet, and a back sheet, which are separate members. Hereinafter, description will be given with reference to fig. 11 and 12.

Fig. 11 is a plan view showing a developed state of the disposable diaper 400 according to the present embodiment. Fig. 12 is a plan view of the abdomen-side sheet 411a and back-side sheet 411b of the disposable diaper 400. The ventral sheet 411a and the dorsal sheet 411b have planar shapes identical to each other.

The disposable diaper 400 of the present embodiment includes an exterior body 410 having a structure different from that of the exterior body 110 of the disposable diaper 100 of the first embodiment. The outer package 410 of the disposable diaper 400 is composed of a waist sheet 411 and a crotch sheet 412, which are formed as separate members. The waist panel 411 is disposed in the waist portion of the waist of the wearer, and is composed of an abdominal panel 411a as an abdominal portion and a back panel 411b as a back portion. The ventral sheet 411a and the dorsal sheet 411b are both in the form of a band extending in the Y-axis direction and are disposed at intervals in the X-axis direction.

The crotch sheet 412 is a crotch portion disposed in the crotch of the wearer. The crotch sheet 412 is a belt-like sheet extending in the X-axis direction, and is stretched between the front and back sheets 411a and 411 b. The crotch sheet 412 is bonded at one end to the region overlapping with the abdomen sheet 411a, and at the other end to the region overlapping with the back sheet 411 b. The ventral sheet 411a and the dorsal sheet 411b are joined to side seals 413 provided at both ends in the Y-axis direction.

The absorber 120 is disposed on the crotch sheet 412. The absorber 120 extends to a region of the crotch panel 412 that overlaps with the waist panel 411. The waist panel 411 is composed of a composite sheet 480 including a first sheet (stretch panel) 11, a second sheet, an adhesive layer, and a cover sheet 4122.

The cover sheet 4122 is a part of the crotch sheet 412, and the crotch sheet 412 also functions as a cover sheet covering the notch 415 described later. The front end and the rear end of the band-shaped crotch panel 412 are cover sheets 4122 covering the notches 415a and 415b, respectively.

The crotch panel 412 is not limited to a laminate sheet obtained by laminating the first panel 11 and the second panel, and may be formed of any stretchable or non-stretchable sheet. When the crotch sheet 412 also serves as a cover sheet, a sheet that is less stretchable than the first sheet 11 may be used as the crotch sheet 412.

The waist panel 411 of the present embodiment has an extensible and contractible region P that is extensible and contractible in the Y-axis direction, as in the waist portion 111 of the outer package 110 of the first embodiment. The waist panel 411 of the outer body 410 has a facing region Q facing the absorbent body 120. A notch 415 is formed in the facing region Q of the waist panel 411 facing the absorbent body 120. As shown in fig. 11, the opposing region Q and the telescopic region P partially overlap each other in a plan view. As shown in fig. 12, the ventral sheet 411a (dorsal sheet 411b) has a U-shaped planar outer shape. The notch 415a (415b) of the stomach-side sheet 411a (back-side sheet 411b) has a U-shaped contour 4151.

In the present embodiment, in the outer cover 410, the crotch panel 412 is disposed outward of the waist panel 411. The joining region where the crotch sheet 412 and the waist sheet 411, which also function as cover sheets, are joined together, is provided along the contour 4121 of the cover sheet 4122, which is a part of the crotch sheet 412. The shape of the joining region has a U-shape. The cover sheet 4122 and the waist sheet 411 are joined by thermal welding. The crotch panel 412 may be disposed inside the outer cover 410 with respect to the waist panel 411.

In the present embodiment, the crotch sheet also serves as the cover sheet, but the present invention is not limited thereto. The following structures may also be formed: the waist sheet and the crotch sheet are bonded to form an outer body, and a region of the waist sheet of the outer body facing the absorbent body is cut away, and a cover sheet is separately provided so as to cover the notch. In the case where the crotch sheet doubles as the cover sheet, the number of components can be reduced as compared with the case where the cover sheet is separately provided.

< sixth embodiment >

In the first embodiment, the non-joined portion 172 in the joined region 170 has a checkered pattern arranged in a pattern discontinuous in any direction, but is not limited to this pattern. Next, another modification of the pattern will be described as a sixth embodiment.

Fig. 13(a) and (B) are partially enlarged plan views illustrating modifications of the pattern of the non-joined portions in the joined region of the composite sheet of the disposable diaper according to the present embodiment. In the modification of the pattern shown in fig. 13, the joint region also includes the non-joint portions and the joint portions, and the non-joint portions are arranged in a pattern discontinuous in any direction, and the occupancy of the joint portions in the joint region is set to 40% or more and 60% or less, whereby the same effects as those of the first embodiment are obtained.

In the first embodiment, the non-joined portions 172 are arranged in two rows in the width direction of the joined region 170 in a checkered pattern, but as shown in fig. 13(a), the non-joined portions may be arranged in three rows in the width direction of the joined region 170 in a checkered pattern. In the first embodiment, the adjacent engaging portions 171 are in a pattern of a point-contact shape. On the other hand, as shown in fig. 13 (B), adjacent rectangular joining portions 171 may have a pattern in which their sides partially overlap and abut each other.

< other embodiment >

While the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the above embodiments, and various modifications may be made without departing from the scope of the present invention.

For example, in each of the above embodiments, the first sheet (stretch sheet) is used so that both the abdomen-side portion and the back-side portion of the waist portion have the stretch regions P, but the first sheet (stretch sheet) may be used so that at least one of the abdomen-side portion and the back-side portion has the stretch regions P. In the case where only the back portion (abdominal portion) of the waist portion is stretchable in the girth direction in the width direction thereof, the cutout portion is provided in the region of the back portion (abdominal portion) facing the absorber of the composite sheet, and the cutout portion is not provided in the abdominal portion (back portion). In addition, only one cover sheet is provided so as to cover the notch portion provided in the back portion (ventral portion). Since the abdomen-side portion (back-side portion) has no stretchability, wrinkles caused by the stretchability of the abdomen-side portion (back-side portion) acting on the region of the absorbent body facing the abdomen-side portion (back-side portion) do not occur, and therefore, the notch portion is not necessary. Even in such a structure, the appearance and the absorption performance of the disposable diaper are not impaired by the wrinkles of the absorbent body, and good appearance and absorption performance can be ensured. Further, since the waist portion has stretchability in the back portion (abdomen portion), the fit of the waistline to the back side (abdomen side) of the wearer is improved, and leakage of excrement from the wearer through the back portion (abdomen) of the waist portion can be suppressed.

In addition, a laminate sheet in which a first sheet (stretchable sheet) and a second sheet (non-stretchable sheet) are laminated is used for the waist portion of the outer body in each of the above embodiments, and when the laminate sheet is applied to a disposable diaper, the first sheet as the stretchable sheet is disposed on the outer surface side and the second sheet is disposed on the inner surface side. For example, when applied to a disposable diaper, the first sheet, which is an extensible sheet, may be disposed on the inner surface side and the second sheet may be disposed on the outer surface side. In other words, the second sheet may be provided to face the outer side of the first sheet (stretch sheet). In this configuration as well, as in the above-described embodiment, the appearance and the absorption performance of the disposable diaper are not impaired by the absorbent body being wrinkled, and good appearance and absorption performance can be ensured. Further, since the waist portion has stretchability in the entire waistline direction, the fit to the waistline of the wearer is improved, and leakage of bodily waste of the wearer from the waistline can be suppressed.

In the case where the second non-stretchable sheet is configured to be disposed on the outer surface side, it is desirable to use the same kind of nonwoven fabric as the second sheet for the cover sheet. Since the cover sheet is exposed to the outside when the disposable diaper is manufactured, the same kind of nonwoven fabric as the second sheet disposed on the outside can be used for the cover sheet, thereby providing the outer surface of the outer package with uniform texture and skin touch. The nonwoven fabrics of the same type are those produced by the same process as those of nonwoven fabrics such as hot air nonwoven fabric, hot roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric and meltblown nonwoven fabric.

In each of the above embodiments, the outer covering uses a composite sheet including a laminated sheet in which a first sheet and a second sheet having stretchability are laminated and a covering sheet. In contrast, the exterior body may be formed of a composite sheet of the stretchable first sheet and the covering sheet without providing the second sheet.

In the above embodiments, a composite sheet including a laminated sheet of the first sheet and the second sheet having the notch portion formed thereon and a covering sheet covering the notch portion is used for the exterior body. On the other hand, a laminate sheet obtained by laminating a first sheet (stretch sheet) having a notch portion and a second sheet having no notch portion may be used for the exterior body. In this case, the second sheet may also serve as a covering sheet for covering the notch portion, or a covering sheet for covering the notch portion may be separately provided.

The pants-type absorbent article of the present invention may be a pants-type disposable diaper which is not previously formed into a pants shape by joining side seals as in the above-described embodiment. That is, the pants-type absorbent article of the present invention may be a tape-type disposable diaper in which a tape such as a hook-and-loop fastener is provided in place of the side seal, and the tape is attached to the side seal when worn, thereby forming a pants shape.

The pants-type absorbent article of the present invention may be a disposable diaper for adults or children, for example, instead of the disposable diaper for infants. The pants-type absorbent article of the present invention may not be a disposable diaper as long as it is a lower body wearing type absorbent article. Examples of such pants-type absorbent articles include pants-type sanitary napkins and pants-type leakproof diapers.

In the fifth embodiment, as shown in fig. 12, the description has been given of the case where the cutout 415a (415b) is formed in a part of the peripheral edge of the waist panel 411a (411b), but a hole-shaped cutout obtained by cutting out the inside of the waist panel may be formed. Hereinafter, description will be given with reference to fig. 14.

As shown in fig. 14 (a) and (B), a hole-shaped cutout portion is formed by cutting out the inside of the waist sheet by providing the connecting portion 30 across the region where the cutout portion 415 is formed in the width direction (Y-axis direction). Further, the planar shape of the notch portion is a rectangle, but the notch portion is not limited thereto.

In fig. 14, the region surrounded by the thick dashed line corresponds to the region of the notch 415 of the fifth embodiment. A center line bisecting the region of the notch 415 in the X-axis direction is denoted by reference numeral 39.

As in the waist panel 41 shown in fig. 14 (a), the connecting portion 30 has a linear shape, and extends in the width direction across a part of the region of the notch portion 415 in the width direction. The connecting portion 30 is provided along one side of the rectangular-shaped waist sheet 41. By providing the connecting portion 30, the waist sheet 41 has a frame shape in which the interior of the waist sheet 41 is cut and penetrated in a rectangular shape. The waist panel 41 is connected at its middle to both side portions 41a and 41b located on both sides in the width direction of the cutout 415 via a region where the cutout 415 is formed, by a connecting portion 30.

As in the waist sheet 42 shown in fig. 14 (B), the connecting portion 30 has a linear shape, extends along the center line 39, and partially spans the region of the notch 415 in the width direction. By providing the connecting portion 30, a hole-shaped cutout portion cut out in a rectangular shape is formed inside the waist panel 42. The waist panel 42 is connected at its middle to both side portions 42a and 42b located on both sides in the width direction of the cutout 415 via a region where the cutout 415 is formed, by a connecting portion 30.

Since the both side portions 41a and 41b (42a and 42b) of the waist sheet 41(42) are coupled by the coupling portion 30, the movement of the both side portions 41a and 41b (42a and 42b) is restricted, and the widthwise bending of the waist sheet 41(42) can be suppressed.

Similarly, the connection portion may be provided in a region of the notch portion provided in the laminated sheet constituting a part of the integrated exterior body described in the first embodiment. Thus, a plurality of hole-like notches are formed in at least one of the back side portion and the stomach side portion of the laminated sheet so as to penetrate the laminated sheet.

Hereinafter, description will be given with reference to fig. 15.

In fig. 15, the region surrounded by the thick dashed line corresponds to the region in which the notch portions 115(115a, 115b) of the first embodiment are formed. A center line bisecting the region of the notch portion 115 in the X-axis direction is denoted by a reference numeral 39. The outer body 43 has a waist portion 44. The waist portion 44 has a ventral portion 44a and a dorsal portion 44 b.

As in the laminated sheet constituting a part of the exterior body 43 shown in fig. 15, the connecting portion 30 has a linear shape, extends along the center line 39, and partially spans the region of the notch portion 115 in the width direction. In each of the ventral portion 44a and the dorsal portion 44b, two hole-shaped cutouts having a rectangular shape in plan view are formed in the region of the cutout 115 by the connecting portion 30.

By providing the connecting portion 30 in this way, similarly to the embodiment shown in fig. 14, the movement of the portions on both sides of the width direction of the cutout portion 115 in the middle of the waist portion 44 is restricted by the connecting portion 30 across the region where the cutout portion 115 is formed, and the bending in the width direction is suppressed.

The position and shape of the connecting portion 30 are not limited to those shown in fig. 14 and 15, and may be those shown in, for example, (a) to (E) of fig. 16, respectively, and the bending in the width direction of the waist panel or the waist portion can be suppressed in the same manner as described above. In each of fig. 16, the crotch portion is located on the lower side in the drawing.

As shown in fig. 16 (a), the connection portion 30 may be provided closer to the crotch portion than the center line 39.

As shown in fig. 16 (B), a plurality of connection portions 30 may be provided.

As shown in fig. 16 (C), in addition to the linear connecting portion 30 along the width direction, a connecting portion 35 connected to the connecting portion 30 and extending across a part of the region of the notched portion 115(415) in the front-rear direction may be provided.

The coupling portion 30 is not limited to a linear shape, and may be a curved coupling portion 36 that extends across a part of the region of the notch portion 115(415) in the width direction, as shown in fig. 16 (D), for example.

As shown in fig. 16 (E), in addition to the linear connecting portion 30 along the width direction, an oblique connecting portion 37 connected to the connecting portion 30 and extending diagonally in the region of the rectangular cutout portion 115(415) may be provided.

In the above embodiment, the present invention also discloses the following absorbent article.

< 1 > a pants-type absorbent article comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet;

a crotch part which is positioned between the front part and the back part and holds the absorber together with the front part and the back part,

the composite sheet has an elastic sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and a cover sheet which is less stretchable than the stretchable sheet and covers the notch.

< 2 > the pants-type absorbent article according to the above < 1 >, wherein,

the thickness of the region of the composite sheet corresponding to the notch portion is equal to or less than the thickness of the region of the composite sheet where the stretchable sheet and the covering sheet overlap each other.

< 3 > the pants-type absorbent article according to the above < 1 > or < 2 >, wherein,

the composite sheet is formed of a single covering sheet at the notch portion.

< 4 > the pants-type absorbent article according to any one of the above < 1 > to < 3 >, wherein,

the cover sheet is disposed between the absorbent body and the stretchable sheet.

< 5 > the pants-type absorbent article according to any one of the above < 1 > to < 3 >, wherein,

the cover sheet is disposed on an outer surface side of the waist portion.

< 6 > the pants-type absorbent article according to any one of the above < 1 > to < 5 >, wherein,

the front side portion, the back side portion, and the crotch portion are continuously formed from the composite sheet, and the cutout portion is continuously formed in the front side portion, the back side portion, and the crotch portion.

< 7 > the pants-type absorbent article according to any one of the above < 1 > to < 6 >, wherein,

the cover sheet and the stretchable sheet are joined to each other by thermal fusion bonding in a joining region.

< 8 > the pants-type absorbent article according to the above < 4 >, wherein,

the cover sheet and the stretchable sheet are bonded by thermal welding in a bonding region along the outline of the stretchable sheet defining the cutout portion without a space therebetween.

< 9 > the pants-type absorbent article according to the above < 5 >, wherein,

the cover sheet and the stretchable sheet are bonded by thermal welding in a bonding region disposed along the contour of the cover sheet without being spaced apart from the contour.

< 10 > the pants-type absorbent article according to any one of the above < 7 > to < 9 >, wherein,

the joining region is provided with a plurality of non-joining portions which are arranged in a pattern which is discontinuous in any direction and to which the stretch sheet and the cover sheet are not heat-welded, and a joining portion which heat-welds the stretch sheet and the cover sheet, and the occupancy rate of the joining portion in the joining region is 40% to 60%.

< 11 > the pants-type absorbent article according to any one of the above < 1 > to < 10 >, wherein,

the composite sheet further includes a sheet facing the inside of the stretchable sheet.

< 12 > the pants-type absorbent article according to any one of the above < 1 > to < 11 >, wherein,

the composite sheet further includes a sheet facing the inside or outside of the stretchable sheet, and the sheet disposed outside the composite sheet and the cover sheet out of the stretchable sheet and the facing sheet are made of the same type of nonwoven fabric.

< 13 > the pants-type absorbent article according to any one of the above < 1 > to < 12 >, wherein,

the composite sheet further includes a sheet facing the inside or outside of the stretchable sheet, and the notch portion is formed in a laminated sheet composed of the stretchable sheet and the facing sheet.

< 14 > the pants-type absorbent article according to any one of the above < 1 > to < 13 >, wherein,

the contour of the stretch panel defining the cutout portion is rectangular, and the length of the cutout portion in the circumferential direction of the waistline is shorter than that of the absorbent body.

< 15 > the pants-type absorbent article according to the above < 14 >, wherein,

one side of the rectangular outline of the stretchable sheet defining the cutout portion and one end of the absorbent body overlap each other in a plan view, and the remaining three sides are located in the area where the absorbent body is present.

< 16 > the pants-type absorbent article according to any one of the above < 1 > to < 15 >, wherein,

the composite sheet is formed such that the notch portion does not reach the peripheral edge of the waist opening of the waist portion, but leaves the peripheral edge.

< 17 > the pants-type absorbent article according to any one of the above < 1 > to < 16 >, wherein,

in the region of the composite sheet corresponding to the notch, only the cover sheet is present outside the absorbent body.

< 18 > the pants-type absorbent article according to any one of the above < 1 > to < 17 >, wherein,

the cover sheet is disposed on the side opposite to the absorbent member side of the stretchable sheet, and is bent toward the absorbent member side at the notch portion.

< 19 > the pants-type absorbent article according to any one of the above < 1 > to < 18 >, wherein,

the elastic layer is elastic yarn.

< 20 > the pants-type absorbent article according to any one of the above < 1 > to < 19 >, wherein,

the stretchable sheet extends in a front-back direction orthogonal to a circumferential direction of the waist portion, and has stretchable sections and connecting sections alternately arranged in the front-back direction, and a grammage of the nonwoven fabric layer of the stretchable section is lower than a grammage of the nonwoven fabric layer of the connecting section.

< 21 > the pants-type absorbent article according to any one of the above < 1 > to < 20 >, wherein,

the composite sheet further includes a sheet facing the inside or outside of the stretchable sheet, and the facing sheet is formed of a nonwoven fabric using the same fibers as those of the nonwoven fabric layer constituting the stretchable sheet.

< 22 > the pants-type absorbent article according to any one of the above < 1 > to < 21 >, wherein,

the cover sheet has a shape larger than the outline of the stretchable sheet defining the notch portion.

< 23 > the pants-type absorbent article according to any one of the above < 1 > -22, wherein,

the cover sheet and the stretchable sheet are joined by heat welding in a heat welding area provided across the contour of the cover sheet.

< 24 > the pants-type absorbent article according to the above < 6 >, wherein,

the cover sheet is disposed from the stomach-side portion to the back-side portion through the crotch portion, and covers the notch portion.

< 25 > the pants-type absorbent article according to any one of the above < 1 > to < 5 >, wherein,

the front side portion, the back side portion, and the crotch portion are formed of different members, and the crotch portion is bonded to the front side portion and the back side portion.

< 26 > the pants-type absorbent article according to any one of the above < 1 > to < 5 >, wherein,

the front side portion, the back side portion, and the crotch portion are continuously formed by the composite sheet, and the notch portion is formed in each of regions of the front side portion and the back side portion that face the absorbent body.

< 27 > the pants-type absorbent article according to the above < 2 >, wherein,

the thickness of the region of the composite sheet corresponding to the notch portion is 0.3mm or more and 10mm or less, preferably 0.5mm or more and 4mm or less, and the thickness of the region of the composite sheet where the stretchable sheet and the covering sheet overlap each other is 0.4mm or more and 10mm or less, preferably 0.5mm or more and 4mm or less.

< 28 > the pants-type absorbent article according to any one of the above < 1 > to < 27 >, wherein,

the stretchable sheet has a nonwoven fabric layer enclosing the elastic layer.

< 29 > the pants-type absorbent article according to the above < 28 >, wherein,

the elastic layer is elastic yarn.

Industrial applicability

According to the present invention, the extension and contraction of the waist portion of the pants-type absorbent article hardly acts on the absorber, and discomfort in wearing can be reduced.

Claims (38)

1. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the cover sheet is disposed between the absorbent body and the stretchable sheet,

the cover sheet and the stretchable sheet are joined by thermal welding in a joining region along the outline of the stretchable sheet defining the cutout portion without a space therebetween.

2. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the cover sheet is disposed on the outer surface side of the waist portion,

the cover sheet and the stretchable sheet are bonded by thermal welding in a bonding region disposed along the contour of the cover sheet without being spaced apart from the contour.

3. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the composite sheet further comprises a sheet opposite to the inner side of the stretchable sheet.

4. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the composite sheet further comprises a sheet opposite to the inner side or the outer side of the stretchable sheet,

the sheet disposed outside the composite sheet and the cover sheet out of the stretchable sheet and the opposing sheet are made of the same type of nonwoven fabric.

5. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the composite sheet further comprises a sheet opposed to the inside or outside of the stretchable sheet, and the notch portion is formed in the laminated sheet composed of the stretchable sheet and the opposed sheet.

6. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the contour of the stretch panel defining the cutout portion is rectangular, and the length of the cutout portion in the circumferential direction of the waistline is shorter than that of the absorbent body.

7. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the stretchable sheet extends in a front-back direction orthogonal to a circumferential direction of the waistline, and has stretchable sections and connecting sections alternately arranged in the front-back direction, and a basis weight of a nonwoven fabric layer of the stretchable section is lower than a basis weight of a nonwoven fabric layer of the connecting section.

8. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the composite sheet further comprises a sheet facing the inside or outside of the stretchable sheet, and the facing sheet is formed of a nonwoven fabric using the same fibers as those of the nonwoven fabric layer constituting the stretchable sheet.

9. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the cover sheet and the stretchable sheet are joined by heat welding at a heat welding area provided across the contour of the cover sheet.

10. A pants-type absorbent article characterized by comprising:

an absorber located at the crotch;

a waist portion having a front side portion and a back side portion positioned at a waist portion, at least one of the front side portion and the back side portion being formed of a composite sheet; and

a crotch part which is located between the front and back parts and holds the absorbent body together with the front and back parts,

the composite sheet has:

a stretchable sheet having a notch portion formed in a region facing the absorbent body and including an elastic layer; and

a cover sheet which is less stretchable than the stretchable sheet and covers the notch portion,

the thickness of the area of the composite sheet corresponding to the notch part is the same as the thickness of the area of the composite sheet overlapped with the telescopic sheet and the coating sheet, or is thinner than the thickness of the area of the composite sheet overlapped with the telescopic sheet and the coating sheet,

the thickness in the region that compound piece with breach portion corresponds is more than 0.3mm and less than 10mm, compound piece the expansion piece with the thickness in the region that the cladding piece overlaps each other is more than 0.4mm and less than 10 mm.

11. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the thickness of the composite sheet in the area corresponding to the gap part is the same as the thickness of the telescopic sheet in the area overlapped with the coating sheet, or is smaller than the thickness of the composite sheet in the area overlapped with the telescopic sheet.

12. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the composite sheet is in the gap portion is formed by the single wrapping sheet.

13. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the cover sheet is disposed between the absorbent body and the stretchable sheet.

14. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the cover sheet is disposed on an outer surface side of the waist portion.

15. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the stomach-side portion, the back-side portion, and the crotch portion are continuously formed from the composite sheet,

the notch portion is continuously formed in the stomach-side portion, the back-side portion, and the crotch portion.

16. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the cover sheet and the stretch sheet are joined at a joining region by thermal fusion.

17. A pant-type absorbent article according to claim 13, wherein:

the cover sheet and the stretchable sheet are joined by thermal welding in a joining region along the outline of the stretchable sheet defining the cutout portion without a space therebetween.

18. A pant-type absorbent article according to claim 14, wherein:

the cover sheet and the stretchable sheet are bonded by thermal welding in a bonding region disposed along the contour of the cover sheet without being spaced apart from the contour.

19. A pant-type absorbent article according to claim 16, wherein:

a plurality of non-joined portions where the stretchable sheet and the cover sheet are not heat-welded and a joined portion where the stretchable sheet and the cover sheet are heat-welded are provided in the joined region in a pattern discontinuous in any direction,

the joint portion in the joint region has an occupancy rate of 40% or more and 60% or less.

20. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the composite sheet further comprises a sheet opposite to the inner side of the stretchable sheet.

21. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the composite sheet further comprises a sheet opposite to the inner side or the outer side of the stretchable sheet,

the sheet disposed outside the composite sheet and the cover sheet out of the stretchable sheet and the opposing sheet are made of the same type of nonwoven fabric.

22. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the composite sheet further comprises a sheet opposed to the inside or outside of the stretchable sheet, and the notch portion is formed in the laminated sheet composed of the stretchable sheet and the opposed sheet.

23. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the contour of the stretch panel defining the cutout portion is rectangular, and the length of the cutout portion in the circumferential direction of the waistline is shorter than that of the absorbent body.

24. A pant-type absorbent article according to claim 23, wherein:

one side of the rectangular outline of the stretchable panel defining the cutout portion and one end of the absorbent body overlap each other in a plan view, and the remaining three sides are located in the area where the absorbent body is present.

25. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the notch portion is formed so as not to reach the peripheral edge of the waist opening of the waist portion, but to leave the peripheral edge.

26. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

in the region of the composite sheet corresponding to the notch portion, only the cover sheet is present outside the absorbent body.

27. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the cover sheet is disposed on the side opposite to the absorbent member side of the stretchable sheet, and is bent toward the absorbent member side at the notch portion.

28. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the elastic layer is composed of elastic wires.

29. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the stretchable sheet extends in a front-back direction orthogonal to a circumferential direction of the waistline, and has stretchable sections and connecting sections alternately arranged in the front-back direction, and a grammage of the nonwoven fabric layer of the stretchable section is lower than a grammage of the nonwoven fabric layer of the connecting section.

30. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the composite sheet further comprises a sheet facing the inside or outside of the stretchable sheet, and the facing sheet is formed of a nonwoven fabric using the same fibers as those of the nonwoven fabric layer constituting the stretchable sheet.

31. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the cover sheet has a shape larger than the contour of the stretchable sheet defining the notch portion.

32. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the cover sheet and the stretchable sheet are joined by heat welding at a heat welding area provided across the contour of the cover sheet.

33. A pant-type absorbent article according to claim 15, wherein:

the cover sheet is disposed from the stomach-side portion to the back-side portion via the crotch portion, and covers the notch portion.

34. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the front side portion, the back side portion, and the crotch portion are formed of different members, and the crotch portion is bonded to the front side portion and the back side portion.

35. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the front side portion, the back side portion, and the crotch portion are continuously formed from the composite sheet, and the notch portion is formed in each of regions of the front side portion and the back side portion that face the absorbent body.

36. A pant-type absorbent article according to claim 11, wherein:

the thickness in the region that compound piece with breach portion corresponds is more than 0.3mm and less than 10mm, compound piece the expansion piece with the thickness in the region that the cladding piece overlaps each other is more than 0.4mm and less than 10 mm.

37. A pant-type absorbent article according to any one of claims 1 to 10, wherein:

the stretchable sheet has a nonwoven fabric layer enclosing the elastic layer.

38. A pant-type absorbent article according to claim 37, wherein:

the elastic layer is composed of elastic wires.

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