CN108472176B

CN108472176B - Disposable diaper having a disposable diaper

Info

Publication number: CN108472176B
Application number: CN201680076910.5A
Authority: CN
Inventors: 笹山贤一; 谷本圭; 近藤唯
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2015-12-28
Filing date: 2016-09-12
Publication date: 2021-03-09
Anticipated expiration: 2036-09-12
Also published as: CN108472176A; JP2017118972A; KR102573001B1; JP6407138B2; KR20180099766A; WO2017115497A1

Abstract

The disposable diaper has an up-down direction and is provided with: a skin side panel (32) disposed on the skin side; a non-skin side sheet (33) disposed on the non-skin side; a stretchable nonwoven fabric (38) disposed between the skin side sheet (32) and the non-skin side sheet (33); and a plurality of welded sections (39) which are positioned below at least the upper end section of the waist section (24) and which join together the skin side sheet (32), the non-skin side sheet (33), and the stretchable nonwoven fabric (38). The adhesive is not present in a distribution region (X) in which a plurality of welded portions (39) are distributed in the waist portion (24). The disposable diaper is characterized in that at least a part of the distribution area (X) located on the skin side sheet (32) contacts the skin during wearing of the disposable diaper.

Description

Disposable diaper having a disposable diaper

Technical Field

The present invention relates to a disposable diaper.

Background

Conventionally, a disposable diaper is known as an absorbent article for absorbing excrement such as urine. As shown in patent document 1, with a disposable diaper, it is known that a non-stretchable nonwoven fabric is fixed to a stretchable sheet to form gathers in the non-stretchable nonwoven fabric.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. H10-99373

Disclosure of Invention

Problems to be solved by the invention

However, in the disposable diaper 1 shown in patent document 1, the stretchable sheet 3A and the nonwoven fabric 3B are fixed to obtain the back sheet 3, and the back sheet 3 is bonded to the front sheet 2 using an adhesive, and thus there is a risk of deterioration in texture due to curing of the adhesive or the like.

The present invention has been achieved in view of the conventional problems such as described above, and an object of the present invention is to improve the texture of a disposable diaper.

Means for solving the problems

An aspect of the present invention to achieve the above object is a disposable diaper having an up-down direction, the disposable diaper comprising: a skin side panel disposed on a skin side; a non-skin side panel disposed on a non-skin side; a stretchable nonwoven fabric disposed between the skin side sheet and the non-skin side sheet; and a plurality of fusion-bonded parts provided at least below an upper end part in a waistline part, wherein the plurality of fusion-bonded parts bond the skin side sheet, the non-skin side sheet and the stretchable nonwoven fabric, a distribution area of the waistline part where the plurality of fusion-bonded parts are distributed is free from an adhesive, at least a part of the distribution area of the skin side sheet contacts the skin while wearing the disposable diaper, the disposable diaper comprises a transverse direction intersecting the vertical direction, the disposable diaper comprises an absorbent main body, a front body sheet part and a back body sheet part, the disposable diaper comprises a plurality of end-bonded parts which bond the front body sheet part and the back body sheet part, the disposable diaper comprises an end-bonded area where the plurality of end-bonded parts are distributed, and the disposable diaper comprises an absorbent main body bonded area, the utility model provides an absorbent article, including absorbent main part joint region, but the absorbent main part is in the absorbent main part joint region the non-skin side of absorbent main part the skin side piece scalable non-woven fabrics with the non-skin side piece is joined, is located absorbent main part joint region the skin side piece scalable non-woven fabrics with the non-skin side piece is provided with another distribution region distributes in another distribution region has a plurality of welding portions, another distribution region's per unit area a plurality of welding portions's total area is less than the per unit area of tip joint region the total area of tip joint portion.

Other features of the present invention will be apparent from the description in this specification and the accompanying drawings.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, in the welded portions, the density is large and the thickness is low due to welding, and in the region between the welded portions, the thickness is higher than the welded portions and a bulging mountain shape is formed. For this reason, when the disposable diaper is worn by the wearer, the mountain shape contacts the skin of the wearer, and therefore a soft texture feeling can be imparted to the wearer. Further, there is no adhesive in the distribution region (dotted region) where the welded portion is distributed, and the stretchability is provided by the nonwoven fabric instead of the film, so that a softer texture can be achieved.

Drawings

Fig. 1 is a schematic perspective view of a diaper 1 according to an embodiment of the present invention.

Fig. 2 is a plan view of the diaper 1 in an unfolded state.

Fig. 3 is a sectional view of the diaper 1 in an unfolded state.

Fig. 4 is a plan view showing the positions of the waist portion 24 and the crotch panel 50 in the diaper 1 in an unfolded state.

Fig. 5 is a plan view showing the positions of the front side joining portion 62, the back side joining portion 66 and the main body joining portion 70 in the diaper 1 in an unfolded state.

Fig. 6 is a front view of the diaper 1 in fig. 1 as seen from the front body section 30 side.

Fig. 7 is a plan view showing the positions of the distribution region X and the body joint region Y in the diaper 1 in the developed state.

Fig. 8 is a diagram illustrating a portion a in fig. 1.

Fig. 9A is a sectional view taken along D-D in fig. 8. Fig. 9B is a sectional view taken along E-E in fig. 8. Fig. 9C is a sectional view of a portion of the waist portion in the case of using the stretchable film.

Fig. 10 is a cross-sectional view schematically showing the stretchable nonwoven fabric 38 (48).

Detailed Description

At least the following matters will become apparent from the description in this specification and the accompanying drawings.

A disposable diaper having a vertical direction, the disposable diaper comprising: a skin side panel disposed on a skin side; a non-skin side panel disposed on a non-skin side; a stretchable nonwoven fabric disposed between the skin side sheet and the non-skin side sheet; and a plurality of fusion-bonded parts provided at least below the upper end part in the waist part, wherein the fusion-bonded parts bond the skin side sheet, the non-skin side sheet, and the stretchable nonwoven fabric, and an adhesive is not present in a distribution area of the waist part where the fusion-bonded parts are distributed, and at least a part of the distribution area of the skin side sheet contacts the skin during wearing of the disposable diaper.

According to this disposable diaper, in the welded portions, the density is high and the thickness is low due to welding, and in the region between the welded portions, the thickness is higher than the welded portions and a bulging substantially mountain shape is formed. For this reason, when the disposable diaper is worn by the wearer, the wearer can be given a soft texture feeling because the substantially mountain shape is in contact with the skin of the wearer. Further, there is no adhesive in the distribution region where the plurality of welded portions are distributed, and the stretchability is provided by the nonwoven fabric instead of the film, so that a softer texture can be achieved.

With this disposable diaper, it is preferable that the upper end portion includes a plurality of elastic threads instead of the stretchable nonwoven fabric.

According to this disposable diaper, the stretchable nonwoven fabric is provided lower than the upper end portion of the waist portion, so that smooth fitting of the entire surface of the stretchable nonwoven fabric to the abdomen can be provided, whereby fluctuation of the abdomen due to breathing of the wearer or the like can be accommodated. On the other hand, since the elastic thread is provided at the upper end portion of the waist portion, the risk of the disposable diaper slipping down can be suppressed by the linear elastic thread.

With this disposable diaper, it is preferable that the non-skin side sheet is folded back downward from an upper end to the skin side sheet, the upper end of the non-skin side sheet is disposed above the upper end of the skin side sheet, and the plurality of elastic threads are disposed between the upper end of the non-skin side sheet and the upper end of the skin side sheet in the vertical direction.

According to this disposable diaper, the skin side sheet is not disposed between the elastic thread and the non-skin side sheet, and therefore the fit during wearing can be improved.

With this disposable diaper, preferably, the disposable diaper includes a lateral direction intersecting the up-down direction, the disposable diaper includes an absorbent main body, a front body panel and a rear body panel, the disposable diaper includes a plurality of end joining parts joining the front body panel and the rear body panel, the disposable diaper is provided with an end joining region in which the plurality of end joining parts are distributed, the sheet is provided with an absorbent main body joining region in which a non-skin side of the absorbent main body, the skin side sheet, the stretchable nonwoven fabric and the non-skin side sheet are joined, the skin side sheet, the stretchable nonwoven fabric and the non-skin side sheet located in the absorbent main body joining region are provided with another distribution region in which the plurality of fusion-joined parts are distributed, a total area of the plurality of welds per unit area of the other distribution region is less than a total area of the end joint per unit area of the end joint region.

According to this disposable diaper, the total area of the plurality of welds per unit area in the other distribution region is smaller than the total area of the end joining portions per unit area of the end joining region, and therefore it is possible to ensure joining strength in the end joining region and air permeability in the other distribution region.

With this disposable diaper, it is preferable that the disposable diaper includes an absorbent main body, the disposable diaper is provided with an absorbent main body joining region in which a non-skin side of the absorbent main body, the skin side sheet, the stretchable nonwoven fabric and the non-skin side sheet are joined, the skin side sheet, the stretchable nonwoven fabric and the non-skin side sheet located in the absorbent main body joining region are provided with another distribution region in which the plurality of fusion-joined parts are distributed, and a total area of the plurality of fusion-joined parts per unit area in the distribution region is smaller than a total area of the plurality of fusion-joined parts per unit area in the other distribution region.

According to this disposable diaper, since the total area of the plurality of welded parts per unit area in the distribution region is smaller than the total area of the plurality of welded parts per unit area in the other distribution region, it is possible to suppress the contraction of the absorber main body in the lateral direction and also to secure appropriate air permeability of the entire disposable diaper.

With this disposable diaper, it is preferable that the distribution area is provided with the plurality of welded portions at even intervals.

According to this disposable diaper, the skin side sheet uniformly contacts the skin of the wearer, and therefore the texture to the wearer can be improved.

With this disposable diaper, it is preferable that the plurality of welded portions are provided at uniform intervals in the entire region of the waist portion excluding the upper end portion and the other distribution region.

According to this disposable diaper, the distribution region is provided in a wide range, and therefore the appearance of the disposable diaper can be improved.

With this disposable diaper, wherein preferably, the stretchable nonwoven fabric contains polyolefin and polyurethane.

According to the disposable diaper, the stretchable nonwoven fabric includes polyolefin, so that weldability of the skin side sheet and the non-skin side sheet is improved, and the stretchability of the stretchable nonwoven fabric in the up-down direction and the right-left direction can be improved since it includes polyurethane.

With this disposable diaper, it is preferable that the thickness of the stretchable nonwoven fabric between the weld portions adjacent to each other is larger than the thickness of the stretchable nonwoven fabric at the central position of each of the weld portions.

According to this disposable diaper, when the diaper is worn, the stretchable nonwoven fabric contacts the wearer's skin before the fused portion contacts the wearer's skin, and therefore a soft texture can be provided.

With this disposable diaper, it is preferable that at least a part of the stretchable nonwoven fabric between the welded portions adjacent to each other contacts the skin-side sheet or the non-skin-side sheet.

According to this disposable diaper, for example, the stretchable nonwoven fabric serves as a cushion when the portion between the welded portions contacts the skin, and therefore the texture can be improved.

With this disposable diaper, it is preferable that the disposable diaper includes a lateral direction intersecting the up-down direction, includes a convex portion in a region surrounded by a pair of the welded portions adjacent to each other in the up-down direction and a pair of the welded portions adjacent to each other in the lateral direction, and the convex portion is provided on a skin side and a non-skin side.

According to this disposable diaper, since the convex portions are provided on both the skin side and the non-skin side, the texture can be further improved.

With this disposable diaper, wherein preferably the stretchable nonwoven fabric has a first region and a second region having a higher fiber density than that of the first region, and

the first regions and the second regions are alternately arranged along a predetermined direction.

According to this disposable diaper, since the region having a high fiber density is provided in the stretchable nonwoven fabric, softness is improved and texture can be further improved.

With this disposable diaper, it is preferable that, in the up-down direction, the fiber density of the stretchable nonwoven fabric in the upper end portion of the stretchable nonwoven fabric is greater than the fiber density of the stretchable nonwoven fabric in the central portion of the waist portion.

According to this disposable diaper, the fiber density in the upper end portion of the stretchable nonwoven fabric is set high, and therefore the risk of damage such as tearing or the like can be suppressed even in the case where the upper end portion of the disposable diaper is pulled up when the wearer puts on the diaper. On the other hand, the fiber density of the stretchable nonwoven fabric in the central portion of the waistline portion is set low, and therefore, the air permeability in the vicinity of the waistline portion can be improved.

With this disposable diaper, it is preferable that the disposable diaper includes a lateral direction intersecting the up-down direction, and the disposable diaper includes: an outer sheet having a front body panel portion, a rear body panel portion, and a crotch portion disposed between the front body panel portion and the rear body panel portion, wherein the front body panel portion is joined to the crotch portion, and the rear body panel portion is joined to the crotch portion; and an absorbent main body provided to extend continuously from the front body panel portion to the back body panel portion, the absorbent main body absorbing excrement, a front body side edge in the transverse direction of the front body panel portion being joined to a back body side edge in the transverse direction of the back body panel portion, the crotch portion being provided with crotch leg gathers, and the crotch leg gathers being not joined to the absorbent main body, and a joined portion of the front body panel portion and the crotch portion being arranged closer to the crotch portion side than a crotch portion side end of the front body side edge in the longitudinal direction as the up-down direction.

According to the disposable diaper, the wearing feeling of the disposable diaper at the inner thigh and the abdomen can be improved.

Disposable diaper according to the present embodiment

Fig. 1 is a schematic perspective view of a disposable diaper according to an embodiment of the present invention, fig. 2 is a plan view of the diaper 1 in an unfolded state, fig. 3 is a sectional view of the diaper 1 in an unfolded state, fig. 4 is a plan view showing positions of a waistline portion 24 and a crotch panel 50 in the diaper 1 in an unfolded state, fig. 5 is a plan view showing positions of a front side joint portion 62, a back side joint portion 66 and a main body joint portion 70 in the diaper 1 in an unfolded state, and fig. 6 is a front view of the diaper 1 in fig. 1 as viewed from a front body panel portion 30 side.

In the following description, the diaper 1 in the state shown in fig. 1 (worn state) has a "vertical direction", a "lateral direction" intersecting with the vertical direction, and a "thickness direction" intersecting with the vertical direction and the lateral direction. In addition, the longitudinal direction of the diaper 1 in the state shown in fig. 2 (developed state) will also be referred to as the "longitudinal direction", both one end and the other end in the longitudinal direction of the diaper 1 will also be referred to as the "upper end", and the center CL in the longitudinal direction of the diaper 1 will also be referred to as the "lower end". Further, with respect to the thickness direction, the side that is in contact with the wearer will be referred to as "skin side", and the opposite side will be referred to as "non-skin side". The line C-C in fig. 2 etc. indicates the center in the lateral direction. Note that fig. 3 is a sectional view taken along line C-C, and the fusion portions 39 and 49 (described later) are not shown for convenience. In addition, for example, there is a case where the welded portions 39 and 49 and the like are omitted in the drawings, and the ratio is not necessarily accurate. In addition, the welded portions 49a and 49b of the back body panel portion 40 are not shown in fig. 6 for convenience.

A disposable diaper 1 (hereinafter referred to as "diaper 1") of the present embodiment is a pull-on diaper (pull-on diaper) worn mainly by adults, and the disposable diaper 1 includes an absorbent main body 10 disposed in the crotch of the wearer, an outer sheet 20 positioned on the non-skin side of the absorbent main body 10, and further includes a waist opening 1a and a pair of

leg openings

1b, 1 b. In addition, a plurality of

elastic threads

30a and 40a are provided in the upper end 25 of the diaper 1.

The outer sheet 20 has a front body panel portion 30, a back body panel portion 40, and a crotch panel 50 (also referred to as a "crotch portion") located between the front body panel portion 30 and the back body panel portion 40. The crotch panel 50 is positioned between the front body panel 30 and the back body panel 40 in the longitudinal direction, and the front body panel 30 and the crotch panel 50 are fixed together with an adhesive or the like, and the back body panel 40 and the crotch panel 50 are fixed together with an adhesive or the like.

The front body panel 30 corresponds to the abdomen of the wearer, the back body panel 40 corresponds to the back (hip) of the wearer, and the crotch panel 50 corresponds to the crotch of the wearer. The absorbent main body 10 is disposed so as to straddle the front body panel portion 30 to the back body panel portion 40 in such a manner as to overlap the front body panel portion 30, the back body panel portion 40 and the crotch panel 50, and the absorbent main body 10 is joined to the outer sheet 20 in the joint portion 70 using an adhesive.

The external appearance shape of the diaper 1 is substantially H-shaped in a plan view (fig. 2), and when the diaper 1 is folded twice with the center CL in an unfolded state as a folded position and then joined at the end joining region Z, a waistline portion 24, a waistline opening portion 1a, and a pair of

leg opening portions

1b, 1b are formed. The end joining zone Z is the zone: in this region, the position of the upper end 31a of the front body side edge 31 and the position of the upper end 41a of the back body side edge 41 match, the position of the lower end 31b of the front body side edge 31 and the position of the lower end 41b of the back body side edge 41 match, and the front body side edge 31 and the back body side edge 41 are joined along a region from the upper end 31a (upper end 41a) to the lower end 31b (lower end 41 b).

A plurality of end joints 29 (fig. 6) are provided in the end joint region Z. The end joining portions 29 are portions formed by ultrasonically joining the front body panel portion 30 and the back body panel portion 40 by applying ultrasonic vibration and pressure, and the end joining portions 29 each have an elliptical shape and are arranged at uniform intervals. Note that the fusion-spliced portion 39a is omitted from the end joining region Z and the laterally outer side of the end joining region Z in fig. 6.

The end joining region Z has a length in the up-down direction that extends from an upper end 29u of the end joining portion 29 on the uppermost end side to a lower end 29d of the end joining portion 29 on the lowermost end side, and has a length in the lateral direction that extends from a lateral end 29e of the end joining portion 29 on the lateral outermost side to a lateral end 29i of the end joining portion 29 on the lateral innermost side, so the end joining region Z has a substantially rectangular shape, and the area of the end joining region Z is represented by Sz.

At this time, it is preferable that the total area (Rz) of the end joining portions 29 per unit area be a predetermined value or more. In other words, the total area (Tz) of the end joint portions 29 provided in the end joint region Z with respect to the area (Sz) of the end joint region Z is preferably equal to or greater than a predetermined value, for example, equal to or greater than 15% (Rz ≧ Tz/Sz ≧ 15%). This is because the end joining region Z needs to secure sufficient joining strength to prevent separation of the front body panel portion 30 and the back body panel portion 40 when the diaper is worn. In the present embodiment, Rz is approximately 19%.

The absorbent main body 10 for absorbing excrement such as urine has a substantially rectangular shape in plan view, and has long sides extending in the longitudinal direction of the diaper 1. The absorbent main body 10 has an absorbent body 11 (fig. 2).

The absorbent body 11 is an absorbent core obtained by laminating liquid absorbent material layers, and is capable of absorbing excrement such as urine. The absorbent body 11 has pulp fibers, an absorbent polymer (SAP), and the like. In addition, the absorbent body 11 is covered with a liquid-permeable sheet such as a nonwoven fabric, and the absorbent body 11 is sandwiched between a back sheet 14 and a liquid-permeable front face sheet 12 made of a nonwoven fabric or the like in the thickness direction, the back sheet 14 having a two-layer structure including a liquid-impermeable sheet made of Polyethylene (PE) or the like and a liquid-permeable sheet made of a nonwoven fabric or the like.

The front body panel 30 has a front waist portion 24a (waist portion 24) and a front body crotch region 34 located on the crotch panel 50 side of the front waist portion 24 a. As shown in fig. 4, the front waist portion 24a has a substantially rectangular shape in plan view, the front waist portion 24a has a length extending from an upper end 31a to a lower end 31b in the up-down direction, the front waist portion 24a has a length extending in the lateral direction from the front body side edge 31 on one side to the front body side edge 31 on the other side, and the front waist portion 24a has a long side extending in the lateral direction and a short side extending in the longitudinal direction. In addition, the front body panel crotch side region 34 has a shape resembling an isosceles trapezoid in plan view.

Similarly, the back body panel portion 40 has a back waist portion 24b (waist portion 24) and a back panel crotch region 44 on the crotch panel 50 side of the back waist portion 24b, and the back waist portion 24b has a substantially rectangular shape in plan view, the back waist portion 24b has a length extending from an upper end 41a to a lower end 41b in the up-down direction, the back waist portion 24b has a length extending in the lateral direction from a front body panel side edge 41 on one side to a back body panel side edge 41 on the other side, and the back waist portion 24b has a long side extending in the lateral direction and a short side extending in the longitudinal direction. In addition, the back body panel crotch side region 44 has a shape resembling an isosceles trapezoid in plan view.

As shown in fig. 3, the front body panel portion 30 and the rear body panel portion 40 respectively include

skin side sheets

32 and 42 disposed on the skin side of the wearer, non-skin side sheets 33 and 43 disposed on the non-skin side, an extensible nonwoven fabric 38 disposed between the skin side sheet 32 and the non-skin side sheet 33, and an extensible nonwoven fabric 48 disposed between the skin side sheet 42 and the non-skin side sheet 43.

The

skin side sheets

32 and 42 and the non-skin side sheets 33 and 43 are flexible sheet members, and are spunbond nonwoven fabrics made of polypropylene (PP) fibers. Preferably, the difference between the weights per unit area (coating weight) of the skin side sheet 32 and the non-skin side sheet 33 and the difference between the coating weights of the skin side sheet 42 and the non-skin side sheet 43 are 5g/m²The following. Therefore, substantially uniform wrinkles are formed on the skin side and the non-skin side of the diaper 1, thus providing good skin texture and also improving aesthetic appearance. The skin side sheet 32 and the non-skin side sheet 33 and the skin side sheet 42 and the non-skin side sheet 43 have the same outer shape in plan view, respectively. Note that the polypropylene fiber may be a homopolymer, or may be a copolymer copolymerized with ethylene. The spunbond fibers are not limited, and a so-called SMS nonwoven fabric obtained by laminating a spunbond nonwoven fabric, a meltblown nonwoven fabric, and a spunbond nonwoven fabric may be used.

The stretchable

nonwoven fabrics

38 and 48 include a polyurethane-based elastomer as thermoplastic elastomer fibers having elasticity and a polyolefin-based resin polypropylene (PP) as thermoplastic resin fibers having inelasticity, and the stretchable

nonwoven fabrics

38 and 48 are nonwoven fabrics subjected to an appropriate stretching treatment such as gear stretching. Due to this stretching process, the stretchable

nonwoven fabrics

38 and 48 have stretchability in the up-down direction and the transverse direction. Note that the stretching process may be performed in directions orthogonal to each other, or may be performed only in a predetermined direction. In the case where the stretching process is performed only in the predetermined direction, the stretchability will be exhibited in the predetermined direction, but it is not necessarily the case where all the fibers are aligned in the predetermined direction, and therefore the stretchability is also exhibited in a direction orthogonal to the predetermined direction.

Fig. 10 is a cross-sectional view schematically showing the stretchable nonwoven fabric 38 (48). In the stretchable nonwoven fabric 38(48), the portions a and the portions b are alternately arranged in the transverse direction due to the gear stretch process. Since the drawing process is performed using the gear having the convex and concave portions on the surface, a portion a corresponds to and is drawn by the convex portion of the gear and has a lower fiber density, and a portion b corresponds to and has a higher fiber density than a portion a as shown in fig. 10. Due to the use of the stretchable nonwoven 38(48), the diaper 1 is softer and has an improved skin texture.

The stretchable nonwoven fabric 38 has substantially the same outer shape as the skin side sheet 32 and the non-skin side sheet 33, and the stretchable nonwoven fabric 48 has substantially the same outer shape as the skin side sheet 42 and the non-skin side sheet 43 (fig. 2). At this time, in the stretchable

nonwoven fabrics

38 and 48, the fiber density in the upper end portions of the stretchable nonwoven fabrics 38 and 48 (that is, the fiber density in the portions near the upper end portion 25 of the diaper 1) is higher than the fiber density in the central portion of the waistline portion 24(24a, 24b) with respect to the up-down direction. Therefore, when the diaper 1 is put on by the wearer, the risk of damage such as tearing can be reduced even when the upper end portion 25 having a higher fiber density is held and pulled up. On the other hand, the fiber density in the lower end side region of the stretchable

nonwoven fabrics

38 and 48 is set lower, and therefore the air permeability of the waistline portion 24 which tends to absorb moisture can be improved.

The upper end portions 25 of the front body panel portion 30 and the rear body panel portion 40 are not provided with the stretchable

nonwoven fabrics

38 and 48, but are provided with the

elastic threads

30a and 40 a. The front panel elastic threads 30a and the back panel elastic threads 40a are linear stretchable members which stretch in the transverse direction, and give stretchability to the waist opening 1a of the diaper 1. The front panel elastic threads 30a are provided to extend from one end portion of the front panel upper end edge 35 to the other end portion along the front panel upper end edge 35, and the rear panel elastic threads 40a are provided to extend from one end portion of the rear panel upper end edge 45 to the other end portion along the rear panel upper end edge 45. Therefore, the threadlike

elastic threads

30a and 40a can prevent the diaper 1 from slipping down or the like. On the other hand, the regions below the upper ends 25 of the front and

back body panels

30 and 40 are provided with the stretchable

nonwoven fabrics

38 and 48, thereby allowing the entire surfaces of the stretchable

nonwoven fabrics

38 and 48 to gently fit the abdomen of the wearer.

As shown in fig. 3, at the upper end of the front body section 30, the non-skin side sheet 33 is folded back downward toward the skin side from the front body upper end edge 35 as a starting point, so as to improve the skin texture and improve the durability. At this time, in the lowermost part of the folded back region of the non-skin side sheet 33, the skin side sheet 32, the stretchable nonwoven fabric 38, and the non-skin side sheet 33 are sequentially overlapped from the skin side. On the other hand, in the upper end portion of the non-skin side sheet 33 (that is, in the upper end portion 25 of the diaper 1), a part of the non-skin side sheet 33 and another part of the non-skin side sheet 33 overlap, and a plurality of front body panel elastic threads 30a are disposed between these two parts of the non-skin side sheet 33.

Similarly, at the upper end of the back body section 40, the non-skin side sheet 43 is folded back downward from the back body upper end edge 45. At this time, in the lowermost part of the folded back region of the non-skin side sheet 43, the skin side sheet 42, the stretchable nonwoven fabric 48, and the non-skin side sheet 43 are sequentially overlapped from the skin side. On the other hand, in the upper end portion of the non-skin side sheet 43 (that is, in the upper end portion 25 of the diaper 1), a part of the non-skin side sheet 43 and another part of the non-skin side sheet 43 overlap, and a plurality of back body panel elastic threads 40a are provided between these two parts of the non-skin side sheet 43.

At this time, since the non-skin side sheets 33 and 43 are folded back, the upper ends 33a and 43a of the non-skin side sheets 33 and 43 are set higher than the upper ends 32a and 42a of the

skin side sheets

32 and 42. The front panel elastic threads 30a are disposed between the upper ends 33a of the non-skin side panels 33 and the upper ends 32a of the skin side panels 32, and the back panel elastic threads 40a are disposed between the upper ends 43a of the skin side panels 43 and the upper ends 42a of the skin side panels 42. Therefore, the

skin side panels

32 and 42 are not disposed between the

elastic strands

30a and 40a and the non-skin side panels 33 and 43, and thus the stretching force of the

elastic strands

30a and 40a is easily applied to the wearer, and the fit can be improved when the diaper is worn.

The skin side sheet 32, the stretchable nonwoven fabric 38, and the non-skin side sheet 33 are joined by a plurality of fusion portions 39, thereby forming the front body panel portion 30. Similarly, the skin side sheet 42, the stretchable nonwoven fabric 48, and the non-skin side sheet 43 are joined by the plurality of welded portions 49, thereby forming the back body sheet portion 40. Details of the welded portions 39 and 49 will be described later.

Further, the leg gathers 26 are provided in the front body panel portion 30 and the back body panel portion 40. The leg gathers 26 include front side leg gathers 37 extending continuously from one end to the other end of the front body piece lower end edge 36 along the front body piece lower end edge 36, a back body piece 40 extending continuously from one end to the other end of the back body piece lower end edge 46 along the back body piece lower end edge 46, and crotch leg gathers 54 of the crotch piece 50. The leg gathers 37, 47, and 54 cooperate to impart stretchability to the leg opening portion 1b of the diaper 1. In the front leg gather 37, stretchability is imparted to the skin side sheet 32 and the non-skin side sheet 33 by a plurality of elastic threads disposed between the skin side sheet 32 and the non-skin side sheet 33, and in the back leg gather 47, stretchability is imparted to the skin side sheet 42 and the non-skin side sheet 43 by a plurality of elastic threads disposed between the skin side sheet 42 and the non-skin side sheet 43.

The crotch panel 50 is composed of two nonwoven fabrics and has a substantially hourglass shape in plan view, and the crotch panel 50 includes a bent portion 52 bent inward in the transverse direction in a substantially central portion in the longitudinal direction. In the bending portion 52, the crotch panel 50 has the narrowest width (narrowest portion 53). On the other hand, at both end portions in the longitudinal direction of the crotch panel 50, the bent portion 52 is not provided and the width of the crotch panel 50 is widest (widest portion). Note that as shown in fig. 5, the front body panel portion 30 and the crotch panel 50 are joined at the front side joint 62, and the back body panel portion 40 and the crotch panel 50 are joined at the back side joint 66.

The crotch panel 50 has elastic threads arranged between the two nonwoven fabrics, and thus forms crotch and leg gathers 54. The crotch leg gather 54 is provided to continuously extend along the bent portion 52 and also extend beyond the bent portion 52 to the widest portion in the longitudinal direction of the crotch panel 50. By providing the crotch leg gathers 54 along the bend portion 52, the wearing sensation of the diaper 1 at the inner thigh side can be further improved.

The crotch leg gathers 54 are not joined to the absorbent main body 10, and the front side joined portion 62 is positioned on the crotch panel 50 side with respect to the end (lower end 31b) of the crotch panel 50 side positioned on the front body panel side edges 31 in the up-down direction. Therefore, the wearing feeling of the diaper 1 at the inner thigh and the abdomen can be improved.

The bent portion 52 overlaps the front body panel portion 30, and thus the crotch panel 50 can be smoothly joined to the front body panel portion 30 via the bent portion 52.

In the overlapped portion where the front body panel portion 30 and the crotch panel 50 are overlapped, the non-joined portions 64 are provided in both end portions in the transverse direction of the overlapped portion in addition to the front side joined portion 62, so that the wearing sensation of the diaper 1 at the inner thigh side can be further improved. In addition, since the crotch leg gathers 54 overlap the non-joined portions 64, the number of movable regions of the crotch leg gathers 54 can be reduced.

In the vertical end portions in the up-down direction among both lateral end portions in the lateral direction of the absorbent main body 10, the absorbent main body 10 is joined to the exterior sheet 20, while in the vertical non-end portions in the up-down direction that overlap with the front side joining portions 62 among both lateral end portions, the absorbent main body 10 is not joined to the exterior sheet 20. Therefore, in both end portions in the lateral direction, in the vertical end portions (that is, at the four corners of the absorbent main body 10), the absorbent main body 10 can be firmly fixed to the outer sheet 20.

The distance D1 separating the narrowest portion 53 of the crotch panel 50 from the front side joint part 62 is less than the distance D2 separating the narrowest portion 53 from the back side joint part 66. Therefore, it is possible to alleviate the roughness of the rear side while also terminating the wrinkles in the front side joining portion 62 in advance.

The outer sheet 20 to which the absorbent main body 10 is joined in the vertical direction at a portion excluding the end portion of the back body panel 40 on the crotch panel 50 side in the widthwise central portion of the absorbent main body 10. Therefore, it is possible to firmly fix the portion to be fixed of the widthwise central portion of the absorbent main body 10, and also to leave the unfixed portion (B) of the absorbent main body 10 which is not to be fixed.

Welding portion 39, 49

Fig. 7 is a plan view showing the positions of the distribution region X and the body joint region Y in the diaper 1 in the developed state. Fig. 8 is a diagram illustrating a portion a in fig. 1. Fig. 9A is a sectional view taken along D-D in fig. 8. Fig. 9B is a sectional view taken along E-E in fig. 8.

The distribution region X is provided in a region of the front body panel portion 30 excluding the body joining region Y and the upper end portion 25 and a region of the back body panel portion 40 excluding the body joining region Y and the upper end portion 25. In fig. 7, the distribution region X is a region indicated by a diagonal line having the same inclination as the diagonal line indicated by the reference numeral "X", and is a region where the fusion-bonded portion 39a (39) and the fusion-bonded portion 49a (49) are distributed. Note that, in the present embodiment, in the front body panel portion 30 and the rear body panel portion 40, the fusion-joined portions 39a and 49a are also provided at the end joining region Z and laterally outside the end joining region Z. Therefore, the welded portions 39 and 49 are provided in a wider range than the front body panel portion 30 and the back body panel portion 40, so that the diaper 1 can be given a uniform appearance feeling, and the appearance of the diaper 1 can be improved.

In fig. 7, the body joint region Y is a region indicated by a diagonal line having the same gradient as the diagonal line indicated by the reference numeral "Y", is a region of the front body panel 30 overlapping the absorbent body 10, is a region of the back body panel 40 overlapping the absorbent body 10, and is a region in which the welded portions 39b are distributed. In the present embodiment, the welded portions 39 formed in the distribution region X are welded portions 39a and 49a, and the welded portions 39 and 49 formed in the body joining region Y are welded portions 39b and 49 b.

The multiple welded portions 39a in the front body panel portion 30 are pure black portions in fig. 6 and the like, and are portions where the skin side sheet 32, the stretchable nonwoven fabric 38, and the non-skin side sheet 33 are ultrasonically joined by applying ultrasonic vibration and pressure, and the skin side sheet 32, the stretchable nonwoven fabric 38, and the non-skin side sheet 33 are fused together and solidified. The fusion portions 39a (49a) are shaped, for example, in a circular shape having substantially the same size and uniformly distributed.

In the following description, the four fusion portions 39a in the region F surrounded by the two-dot chain line in fig. 8 are the first fusion portion 39a1, the second fusion portion 39a2, the third fusion portion 39a3, and the fourth fusion portion 39a 4. As shown in fig. 8, this region is provided with a first weld 39a1, a second weld 39a2 adjacent to the first weld 39a1 below the first weld 39a1, a third weld 39a3 provided between the first weld 39a1 and the second weld 39a2 in the up-down direction and adjacent to the first weld 39a1 from one side (left side) in the lateral direction, and a fourth weld 39a4 provided between the first weld 39a1 and the second weld 39a2 in the up-down direction and adjacent to the first weld 39a1 from the other side (right side) in the lateral direction. The first fusion portion 39a1, the second fusion portion 39a2, the third fusion portion 39a3, and the fourth fusion portion 39a4 are arranged so as to form diamond-shaped vertices.

At this time, a straight line Sv connecting the first fusion portion 39a1 and the second fusion portion 39a2 extends in the up-down direction, and a straight line Sh connecting the third fusion portion 39a3 and the fourth fusion portion 39a4 extends in the lateral direction. The intersection point between the straight line Sv and the straight line Sh is defined as an intersection point N, the distance from the lower end of the first fusion portion 39a1 to the intersection point N is defined as d, the distance from the upper end of the second fusion portion 39a2 to the intersection point N is defined as d, and the distance from the lower end of the first fusion portion 39a1 to the upper end of the second fusion portion 39a2 is defined as 2 d. Similarly, the distance from the right end of the third fusion portion 39a3 to the intersection point N is e, the distance from the left end of the fourth fusion portion 39a4 to the intersection point N is e, and the distance from the right end of the third fusion portion 39a3 to the left end of the fourth fusion portion 39a4 is 2 e.

The distance from the right end of the third weld 39a3 to the left end of the fourth weld 39a4 (i.e., distance 2e) is preferably 1.5mm to 5.0 mm. In addition, the distance from the first fusion portion 39a1 to the third fusion portion 39a3 (fourth fusion portion 39a4) and the distance from the second fusion portion 39a2 to the third fusion portion 39a3 (fourth fusion portion 39a4) are each preferably 1.0mm to 3.0mm, more preferably 1.5mm to 2.5 mm. This is because, when these distances are too short, the stretchable nonwoven fabric 38 does not exhibit a stretching force, and wrinkles may not be formed properly, and when these distances are too long, the wrinkles formed are too large, and fine wrinkles may not be formed, and the sense of uniformity in appearance of the front body panel 30 may be reduced.

At this time, the distance (2d) between the first fusion portion 39a1 and the second fusion portion 39a2 is longer than e (2d > e) which is a half of the distance between the third fusion portion 39a3 and the fourth fusion portion 39a4, and the distance (2e) between the third fusion portion 39a3 and the fourth fusion portion 39a4 is longer than d (2e > d) which is a half of the distance between the first fusion portion 39a1 and the second fusion portion 39a 2.

The first fusion-bonded portion 39a1, the second fusion-bonded portion 39a2, the third fusion-bonded portion 39a3, and the fourth fusion-bonded portion 39a4 are provided at a plurality of positions, the first fusion-bonded portion 39a1 and the second fusion-bonded portion 39a2 are arranged at uniform intervals in the vertical direction, and the third fusion-bonded portion 39a3 and the fourth fusion-bonded portion 39a4 are arranged at uniform intervals in the lateral direction. In other words, the first fusion portions 39a1, the second fusion portions 39a2, the third fusion portions 39a3, and the fourth fusion portions 39a4 are arranged at uniform intervals throughout the distribution region X. Note that although the first fusion portion 39a1, the second fusion portion 39a2, the third fusion portion 39a3, and the fourth fusion portion 39a4 are described as the four fusion portions 39a in the region F, any fusion portion 39a can be set as the first fusion portion 39a1, the second fusion portion 39a2, the third fusion portion 39a3, and the fourth fusion portion 39a 4. For example, the weld 39a in the region F below the second weld 39a2 may be the first weld 39a 1.

In addition, the first fusion portion 39a1, the second fusion portion 39a2, the third fusion portion 39a3, and the fourth fusion portion 39a4 are provided at a plurality of positions, and thus a plurality of intersection points N are also provided. At this time, the first fusion portions 39a1 and the second fusion portions 39a2 are provided at even intervals in the up-down direction, the third fusion portions 39a3 and the fourth fusion portions 39a4 are provided at even intervals in the lateral direction, and thus the intersection points N are also arranged at even intervals in the up-down direction and the lateral direction.

As shown in fig. 9A and 9B, in the distribution region X, the skin side sheet 32 is disposed on the skin side, the non-skin side sheet 33 is disposed on the non-skin side, the stretchable nonwoven fabric 38 is disposed between the skin side sheet 32 and the non-skin side sheet 33, and these members are fusion-joined at a fusion-joined portion 39A. The center of the welded portion is cu, and the thickness of the central cu is smaller than the sum of the thicknesses of the non-welded portions, that is, the thickness of the central cu is smaller than the sum of the thicknesses of the skin side sheet 32, the stretchable nonwoven fabric 38, and the non-skin side sheet 33 between the welded portions 39 a.

The joining of the skin side sheet 32, the stretchable nonwoven fabric 38 and the non-skin side sheet 33 is generally performed by laminating the skin side sheet 32 and the non-skin side sheet 33 and the stretchable nonwoven fabric 38 stretched in the transverse direction. For this reason, as shown in fig. 9A, due to the stretchability, fiber softness, and irregularity of the stretchable nonwoven fabric 38 in the transverse direction, the distribution region X having a natural length after welding bulges out in the thickness direction, and the skin side sheet 32 bends toward the skin side and the non-skin side sheet 33 bends toward the non-skin side. In other words, the thickness of the stretchable nonwoven fabric 38 between the third welded portion 39a3 and the fourth welded portion 39a4 (between the welded portions 39 a) is greater than the thickness of the stretchable nonwoven fabric 38 at the center cu of the welded portion 39. The stretchable nonwoven fabric 38 having a large thickness allows the skin side sheet 32 to be further bent toward the skin side, and allows the non-skin side sheet 33 to be further bent toward the non-skin side. As a result, the thickness between the third fusion-bonded portion 39a3 and the fourth fusion-bonded portion 39a4 (between the fusion-bonded portions 39 a) is large, a convex shape that protrudes toward the skin side and the non-skin side is formed, and the thickness at the intersection point N at the center in the lateral direction between the fusion-bonded portions 39 is particularly maximum.

Since the stretchable nonwoven fabric 38 also has stretchability in the vertical direction, as shown in fig. 9B, due to the stretchability, fiber softness, and irregularity of the stretchable nonwoven fabric 38 in the vertical direction, the distribution region X having a natural length after welding bulges out in the thickness direction, and the skin side sheet 32 bends toward the skin side, and the non-skin side sheet 33 bends toward the non-skin side. In other words, the thickness of the stretchable nonwoven fabric 38 between the first welded portion 39a1 and the second welded portion 39a2 (between the welded portions 39 a) is greater than the thickness of the stretchable nonwoven fabric 38 at the center cu of the welded portion 39. The stretchable nonwoven fabric 38 having a large thickness allows the skin side sheet 32 to be further bent toward the skin side, and allows the non-skin side sheet 33 to be further bent toward the non-skin side. As a result, the thickness between the first fusion-bonded portion 39a1 and the second fusion-bonded portion 39a2 (between the fusion-bonded portions 39 a) is large, a convex shape that protrudes toward the skin side and the non-skin side is formed, and the thickness at the intersection point N at the center in the up-down direction between the fusion-bonded portions 39 is particularly maximum. Note that, in the case where the stretchability in the up-down direction is smaller than the stretchability in the lateral direction, the protruding amount of the convex shape shown in fig. 9B is smaller than that shown in fig. 9A.

The total area (Ra) of the fusion-spliced portion 39a per unit area is preferably a predetermined value or less. In other words, the total area (Ta) of the plurality of fusion portions 39a provided in the distribution region X is preferably a predetermined value or less (Ta/Sx ≦ predetermined value) with respect to the area (Sx) of the distribution region X in the precursor sheet portion 30. The Ta/Sx is preferably about 2% to 7% (Ta/Sx ≈ 2% to 7%). This is because when Ta/Sx is greater than 7%, there is a risk of the breathability of the front body panel portion 30 (diaper 1) being reduced, and when Ta/Sx is less than 2%, there is a risk of the junction of the skin side panels 32, the stretchable nonwoven fabric 38, and the non-skin side panels 33 being separated.

Next, the welded portion 39b will be explained. The welded portions 39b join the skin side sheet 32, the stretchable nonwoven fabric 38, and the non-skin side sheet 33 while also suppressing the stretching of the stretchable nonwoven fabric 38 and preventing the risk of leakage of excrement due to unnecessary contraction of the absorbent main body 10 caused by the stretchable nonwoven fabric 38.

The plurality of welded portions 39b of the front body panel portion 30 are solid black portions in fig. 6 and the like, and are portions where the skin side sheet 32, the stretchable nonwoven fabric 38, and the non-skin side sheet 33 are ultrasonically bonded by applying ultrasonic vibration and pressure. The welded portion 39b has substantially the same size, and is formed in a substantially rectangular shape in which upright rectangles inclined at 45 degrees and inclined at-45 degrees are regularly arranged. Note that the welded portion 49b of the back body panel portion 40 is not shown in fig. 6 for convenience.

At this time, the total area (Tb) of the plurality of fusion portions 39b provided to the body joint region Y with respect to the area (Sy) of the body joint region Y of the front body panel portion 30 is preferably smaller than the total area (Sz) of the end joint portion 29 provided to the end joint region Z with respect to the area (Sz) of the end joint region Z (Tb/Sy < Tz/Sz), and Tb/Sy is preferably 7% to 14%. In other words, the total area (Rb) of the welded portions 39b per unit area is smaller than the total area (Rz) of the end joining region 29 per unit area.

As described above, the end joining region Z needs to secure sufficient joining strength to prevent separation of the front body panel portion 30 and the rear body panel portion 40, and thus the end joining portion 29 having a predetermined area (Rz) needs to be formed. When the welded portion 39b having the area (Rz) is provided in the body joining region Y, there is a fear that the welded portion 39b will excessively block the air permeability.

For this reason, the total area (Rb) of the welded portions 39b per unit area is set smaller than the total area (Rz) of the end joining regions 29 per unit area (Rb < Rz), and thus it is possible to ensure both the joining strength in the end joining region Z and the air permeability in the body joining region Y.

The total area (Ta) of the plurality of fusion-bonded portions 39a provided in the distribution region X with respect to the area (Sx) of the distribution region X in the front body piece 30 is smaller than the total area (Tb) of the plurality of fusion-bonded portions 39b provided in the body joint region Y with respect to the area (Sy) of the body joint region Y in the front body piece 30 (Ta/Sx < Tb/Sy). In other words, the total area (Ra) of the welded portions 39a per unit area is smaller than the total area (Rb) of the welded portions 39b per unit area (Ra < Rb).

In the body joint region Y, air permeability must be ensured, but in order to suppress the contraction of the absorbent body 10 in the transverse direction due to the stretchable nonwoven fabric 38, the welded portion 39b having a specific area (Rb) must be provided. In the waistline portion 24 which is susceptible to problems such as perspiration and moisture accumulation, breathability is very important, and when the welded portion 39a is provided in the distribution region X having the same area (Rb) as the body joining region Y, there is a fear that the welded portion 39a will hinder breathability more than necessary.

For this reason, the total area (Ra) of the welds 39a per unit area is set smaller than the total area (Rb) of the welds 39b per unit area (Ra < Rb), so it is possible to prevent contraction of the absorbent main body 10 in the lateral direction while also ensuring appropriate breathability of the entire diaper 1.

Although the skin side sheet 32, the stretchable nonwoven fabric 38, the non-skin side sheet 33, and the welded

portions

39a and 39b of the front body panel portion 30 are described above, the same features are also applied to the skin side sheet 42, the stretchable nonwoven fabric 48, the non-skin side sheet 43, and the welded portions 49a (49) and 49b (49) of the rear body panel portion 40.

Other effects

In the conventional disposable diaper, the stretchable sheet and the non-stretchable sheet (skin side sheet and non-skin side sheet) are joined using the adhesive to form the front body panel portion and the back body panel portion, and thus the texture is deteriorated due to the curing of the adhesive. In addition, when a stretchable film having elastic force is used as the stretchable sheet, the stretching direction is only one direction (e.g., transverse direction), and thus a portion having poor texture is formed by the wrinkles formed in the non-stretchable sheet by the stretchable film, and there is a fear of feeling, particularly, the film rattling. Fig. 9C is a sectional view of a portion of the waist portion in the case of using the stretchable film. As shown in fig. 9C, in the conventional disposable diaper, a skin side sheet 92, an extensible film 98, and a non-skin side sheet 93 are disposed in this order from the skin side. The thickness of the stretchable film 98 is substantially uniform, and thus a gap is formed between the skin side sheet 92 and the stretchable film 98, and between the non-skin side sheet 93 and the stretchable film 98. Therefore, when the diaper is in contact with the wearer's skin while being worn, for example, as shown by the portion indicated by the arrow in fig. 9C, the skin side panels 92 or the non-skin side panels 93 may be easily recessed toward the stretchable film 98.

In contrast, in the present embodiment, as shown in fig. 9A and 9B, the fibers of the stretchable nonwoven fabric 38 between the welded portions 39 bulge out in the thickness direction due to the contraction effect. The thickness of the stretchable nonwoven fabric 38 is increased between the welded portions 39, and thus the stretchable nonwoven fabric 38 can play a cushioning role even if there is contact with the skin when the diaper is worn, and the easy formation of depressions can be suppressed. Therefore, the diaper 1 feels soft when worn.

In the present embodiment, it is desirable that at least a part of the stretchable nonwoven fabric 38 between the fusion-bonded portions 39 adjacent to each other is in contact with the skin side sheet 32 or the non-skin side sheet 33. This may further improve the texture.

In addition, in the present embodiment, since stretchability is provided by a stretchable nonwoven fabric instead of a stretchable film, a soft feeling can be imparted to the entire area in contact with the skin, instead of an inorganic feeling (inorganic feeling) like a film. In addition, since the stretchable

nonwoven fabrics

38 and 48 have stretchability in a plurality of directions (i.e., up-down direction and transverse direction), the

skin side panels

32 and 42 can contact the skin from a plurality of directions when the diaper is worn due to the stretchable

nonwoven fabrics

38 and 48 having stretchability in a plurality of directions, and the

skin side panels

32 and 42 can be separated from the skin in a plurality of directions when the diaper is worn and taken off, so that a smooth feeling can be given to the wearer. In particular, in the case of a pants-type disposable diaper such as the diaper 1, the pants-type disposable diaper is pulled up while gripping both sides of the

skin side sheets

32 and 42 and the non-skin side sheets 33 and 43, and thus a soft feeling can be achieved by forming a hand-contacting portion of the diaper 1 using nonwoven fabric. In particular, a person feels the texture by comparison, and when both sides have the same degree of softness, a soft feeling of the diaper 1 can be achieved.

In addition, in the

skin side sheets

32 and 42, at least the portion provided with the distribution area X abuts the skin during wearing, and therefore the user can feel a soft texture. Specifically, as shown in fig. 9A and 9B, the welded portion 39(49) has a high fiber density due to welding, and the total thickness of the skin side sheets 32(42), the stretchable nonwoven fabric 38(48), and the non-skin side sheets 33(43) is reduced, but the total thickness of the skin side sheets 32, the stretchable nonwoven fabric 38, and the non-skin side sheets 33 is larger in the region between the welded portions 39 than in the welded portions 39, thus forming a substantially mountain-shaped bulge. When the diaper is worn, the skin of the wearer first abuts the portion bulging in a substantially mountain shape, and therefore a soft texture can be provided.

Further, in the waistline portion 24, no adhesive is used in the distribution region X where the plurality of welded portions 39 and 49 are distributed, and therefore, deterioration of the texture due to curing of the adhesive can be prevented.

In addition, in the present embodiment, the plurality of fusion-bonded portions 39 and 49 are arranged at the distribution region X at uniform intervals. According to this configuration, the portions bulging out in the substantially mountain shape are formed in a substantially uniform state, and therefore the substantially mountain-shaped portions of the

skin side sheets

32 and 42 abut the skin of the user in a uniform manner, and the texture felt by the user can be improved.

Further, in the present embodiment, in the waistline portion 24, the distribution regions X are provided at even intervals over the entire region excluding the body joint region Y and the upper end portion 25 of the diaper 1. Therefore, the welded portions 39 and 49 are formed in a wide range, and thus the substantially mountain-shaped region is formed in a wide range, and not only the texture but also the aesthetic property of the diaper 1 is improved.

Further, in the present embodiment, the stretchable

nonwoven fabrics

38 and 48 include polyolefin, and therefore the weldability of the

skin side sheets

32 and 42 and the non-skin side sheets 33 and 43 can be improved. In particular, in the present embodiment, the

skin side sheets

32 and 42 and the non-skin side sheets 33 and 43 are each a nonwoven fabric made of PP fibers which are polyolefin-based fibers, and since the polyolefin-based resin polypropylene (PP) is included in the stretchable nonwoven fabric, a stronger weld is achieved by melting during the weld. In addition, since the stretchable

nonwoven fabrics

38 and 48 include polyurethane, the stretchable nonwoven fabrics can be given stretchability in the vertical direction and the lateral direction.

Further, in the present embodiment, the thickness of the stretchable

nonwoven fabrics

38 and 48 between the welded parts 39 and 49 adjacent to each other is larger than the thickness of the stretchable

nonwoven fabrics

38 and 48 in the central portion cu of the welded parts 39 and 49. As shown in fig. 9A and 9B, the thickness of the stretchable nonwoven fabric 38 is small in the welded portion 39, and is particularly small at the position of the central position cu of the welded portion 39. The stretchable nonwoven fabric 38 is subjected to a stretching process such as gear stretching, and the stretchable nonwoven fabric 38 has a substantially mountain-shaped portion bulging in the thickness direction in a natural length state. However, in the welded portion 39, the thickness of the welded portion 39 is small since it is fixed in the thickness direction by welding. As a result, the stretchable nonwoven fabric 38 bulges between the welded portions 39 due to the stretching force, and therefore has a larger thickness than that of the welded portions 39. In particular, at the intersection point N, the thickness tends to be maximum. In addition, due to the swelling of the stretchable nonwoven fabric 38, the skin side sheet 32 and the non-skin side sheet 33 can be further bent in the vertical direction. Therefore, when the diaper is worn, the bulging portions between the welds 39 contact the skin before the welds 39, and thus the texture can be further improved.

Further, in the present embodiment, the convex portions are provided in the region surrounded by the pair of fusion-bonded portions 39 and 49 adjacent to each other in the up-down direction and the pair of fusion-bonded portions 39 and 49 adjacent to each other in the lateral direction, and the convex portions are provided on the skin side and the non-skin side. In other words, substantially mountain-shaped portions as projections projecting from the skin side and the non-skin side exist between the first welded portion 39A1 and the second welded portion 39A2 which are adjacent in the up-down direction (fig. 9A), and substantially mountain-shaped portions as projections projecting from the skin side and the non-skin side exist between the third welded portion 39A3 and the fourth welded portion 39A4 which are adjacent in the lateral direction (fig. 9B). The centers in the up-down direction and the lateral direction are the intersection point N, and the areas centered on the intersection point N and surrounded by the first fusion portion 39a1, the second fusion portion 39a2, the third fusion portion 39a3, and the fourth fusion portion 39a4 form projections on the skin side and the non-skin side. Therefore, when the diaper is worn, the convex portions contact the skin before the welded portions 39a and 49a, and therefore the texture is improved, and when the diaper is worn, by pulling up the diaper by grasping both sides of the

skin side panels

32 and 42 and the non-skin side panels 33 and 43, it is possible to impart a soft feeling to the wearer's diaper 1 by improving the texture of both the

skin side panels

32 and 42 and the non-skin side panels 33 and 43.

In other embodiments, the invention is not limited to the specific embodiments described

Although the embodiments of the present invention have been described above, the above embodiments are provided to aid understanding of the present invention and are not to be construed as limiting the present invention. The present invention can be modified, improved, and the like without departing from the gist of the present invention, and equivalents thereof are also included in the present invention. For example, modifications such as the following can be made.

In the above embodiment, the welded portions 39 and 49 and the end joining portion 29 are each formed by joining a plurality of sheets or the like by ultrasonic joining, but are not limited thereto. The joining may be performed by another means of heating and pressing such as thermal welding or melting.

In the above embodiment, the stretchable member disposed at the upper end portion 25 is the plurality of

elastic threads

30a and 40a, and the

nonwoven fabrics

48 and 38 are not provided therein, but is not limited thereto. The elastic threads disposed at the upper end portion 25 may be the nonwoven fabrics 38 and 49 and the plurality of

elastic threads

30a and 40a, or may be only the

nonwoven fabrics

38 and 48. It should be noted that by providing the

elastic threads

30a and 40a in the upper end portion 25, the risk of the diaper 1 slipping down can be suppressed.

In the above embodiment, the non-skin side sheets 33 and 43 are folded back to the skin side, and the upper ends of the non-skin side sheets 33 and 43 are set higher than the upper ends of the

skin side sheets

32 and 42, but the non-skin side sheets 33 and 43 do not necessarily need to be folded back. In addition, the upper ends of the

skin side sheets

32 and 42 may be disposed at the same positions as the non-skin side sheets 33 and 43. Further, the

skin side panels

32 and 42 may be folded back to the non-skin side. It should be noted that by providing only one sheet (non-skin side sheet 33, 43) between the wearer's skin and the

elastic threads

30a and 40a as in this embodiment, the stretching force of the

elastic threads

30a and 40a is more easily transmitted to the wearer's abdomen, and the risk of the diaper 1 slipping down can be further suppressed.

In the above embodiment, the total area (Ra) of the welding portions 39a per unit area is smaller than the total area (Rb) of the welding portions 39b per unit area, and the total area (Rb) of the welding portions 39b per unit area is smaller than the total area (Rz) of the end joining regions 29 per unit area (Ra < Rb < Rz), but is not limited thereto. The total area (Ra) of the welded portions 39a per unit area, the total area (Rb) of the welded portions 39b per unit area, and the total area (Rz) of the end joining region 29 per unit area may be set at any ratio.

In the above embodiment, the welding portions 39 and 49 are arranged at a uniform interval, but are not limited thereto. The welds 39 and 49 may be arranged at non-uniform intervals or in a pattern.

In the above embodiment, in the front body panel section 30 and the rear body panel section 40, the region excluding the upper end portion 25 and the body joining region Y is the distribution region X, but is not limited thereto. The distribution region X may be provided in a part of the front body panel 30 and the rear body panel 40. In other words, as long as the distribution area X is provided in a part of the waistline portion 24 of the front body panel portion 30 and the back body panel portion 40, the area other than the distribution area X may be an area where the welded portions 39 and 49 are not formed, or may be an area where an adhesive is used. Even in the case where the distribution region X is provided in a part of the front body panel 30 and the back body panel 40, the region between the fusion-bonded portions 39 and 49 has a substantially mountain shape. For this reason, the generally mountain shape contacts the skin when the diaper is worn, and can provide a soft texture to the wearer. Note that, with respect to the lateral direction of the front body panel portion 30 and the rear body panel portion 40, it is preferable that the distribution region X be provided in a region from an end portion located on one end side to an end portion located on the other end side. According to this configuration, uniformity is imparted to the appearance of the diaper 1, and fine wrinkles are formed, so the shape and texture of the cloth can be realized, and the beauty of the diaper 1 can be improved.

In the above embodiment, the stretchable

nonwoven fabrics

38 and 48 exhibit stretching force due to the stretching process through the gears having the convex and concave portions on the surfaces, but are not limited thereto. The stretching force may be provided by stretching using, for example, a drum or the like having no convex and concave portions on the surface. It should be noted that by performing the gear drawing process using the gear having the convex and concave portions on the surface, the regions having different fiber densities as shown in fig. 10 can be formed, and therefore the texture can be further improved.

In the above embodiment, the

skin side sheets

32 and 42 and the non-skin side sheets 33 and 43 are made of spunbond fibers which are PP fibers, but are not limited thereto. SMS nonwoven fabric, air-permeable nonwoven fabric, spun-bonded nonwoven fabric composed of fibers made of Polyethylene (PE), polyester, polyamide, or the like can be used. The fiber structure is not limited to a single fiber made of a single thermoplastic resin, and may be a composite fiber having a core-sheath structure (in which the core material is PP and the sheath material is PE) or a fiber having other structures. Note that the sheet is preferably a nonwoven fabric made of monofilaments (mono-films), and it is most preferable that the thermoplastic resin fibers for the

skin side sheets

32 and 42, the non-skin side sheets 33 and 43, and the stretchable

nonwoven fabrics

38 and 48 are the same fibers. This is because a stronger bond is achieved by melting and solidifying fibers made of the same composition.

In the above embodiments, in the stretchable

non-woven fabrics

38 and 48, the polyurethane-based elastomer is used for the thermoplastic elastomer fiber having elasticity, and the PP is used for the thermoplastic resin fiber having non-elasticity, but not limited thereto. The thermoplastic elastomer fiber having elasticity may be a polystyrene-based elastomer, a polyolefin-based elastomer, a polyamide-based elastomer, or the like, and the thermoplastic resin fiber having inelasticity may be a fiber including a polyolefin-based resin such as PE or an ethylene-alpha olefin copolymer.

In the above embodiment, the fiber density is higher in the upper end portions of the stretchable

nonwoven fabrics

38 and 48, but is not limited thereto. The fiber density of the

extensible nonwovens

38 and 48 may be uniform throughout the area. However, by setting a higher fiber density in the upper end portions of the stretchable

nonwoven fabrics

38 and 48, the risk of damage when the diaper 1 is put on and taken off can be further suppressed.

Although the diaper 1 according to the above embodiment is worn by an adult, it is not limited thereto, and the diaper may be worn by a newborn, an infant, or a child such as a young child.

Description of the reference numerals

1 diaper, 1a waist opening part, 1b leg opening part,

10 an absorbent body, 11 an absorbent body,

12 front surface sheets, 14 back surface sheets, 20 outer layer sheets,

24 waist part, 24a front waist part, 24b back waist part,

25 upper end parts, 26 leg parts gather,

29 end joint part,

30 front body parts, 30a front body elastic threads,

31 front body side edge, 31a upper end, 31b lower end,

32 skin side piece, 32a upper end,

33a non-skin side sheet, 33a upper end,

34 a crotch side region of the front body,

35 upper end edges of the front body, 36 lower end edges of the front body,

37 front leg gather,

38 stretchable non-woven fabric,

39 welded portion, 39a welded portion, 39b welded portion,

40 back part, 40a back part elastic thread,

41 rear body side edge, 41a upper end, 41b lower end,

42a skin side sheet, 42a upper end,

43a non-skin side sheet, 43a upper end,

44 crotch side region of the back body, 45 upper end edge of the back body, 46 lower end edge of the back body,

46a lower end edge of the first back piece, 46b lower end edge of the second back piece,

46c lower end edge of the third back body piece,

47 rear leg gather,

48 stretchable non-woven fabric,

49 welded portion, 49a welded portion, 49b welded portion,

A 50 crotch piece, a 52 bending part, a 53 narrowest part,

54 crotch and leg gathers,

62 a front side joint part, 64 a non-joint part, 66 a rear side joint part,

70 a main body joint part,

Center position of CL diaper 1, Sv, Sh straight line,

An X distribution region,

Y body engaging zone (absorbent body engaging zone, further distribution zone),

Z-end joint region

Claims

1. A disposable diaper having an up-down direction, the disposable diaper comprising:

a skin side panel disposed on a skin side;

a non-skin side panel disposed on a non-skin side;

a stretchable nonwoven fabric disposed between the skin side sheet and the non-skin side sheet; and

a plurality of welded parts provided at a position lower than at least an upper end part of the waistline part, the plurality of welded parts joining the skin side sheet, the non-skin side sheet, and the stretchable nonwoven fabric,

the adhesive is not present in the distribution area of the waist part where the plurality of welded parts are distributed,

at least a portion of the distribution area of the skin side panel contacts the skin during application of the disposable diaper,

the disposable diaper includes a lateral direction crossing the up-down direction,

the disposable diaper comprises an absorbent main body, a front body piece part and a back body piece part,

the disposable diaper includes a plurality of end joining parts joining the front body panel part and the rear body panel part,

the disposable diaper is provided with an end joining region in which the plurality of end joining parts are distributed,

the disposable diaper is provided with an absorbent main body joining region in which the non-skin side of the absorbent main body, the skin side sheet, the stretchable nonwoven fabric and the non-skin side sheet are joined,

the skin side sheet, the stretchable nonwoven fabric and the non-skin side sheet positioned in the absorbent main body joining region are provided with another distribution region in which the plurality of welded portions are distributed,

a total area of the plurality of welds per unit area of the other distribution region is less than a total area of the end joint per unit area of the end joint region.

2. The disposable diaper according to claim 1,

the upper end portion does not include the stretchable nonwoven fabric but includes a plurality of elastic threads.

3. The disposable diaper according to claim 2,

the non-skin side sheet is folded back from the upper end to the skin side sheet side in the downward direction,

the upper end of the non-skin side sheet is disposed above the upper end of the skin side sheet, and

the plurality of elastic threads are disposed between an upper end of the non-skin side sheet and an upper end of the skin side sheet in the vertical direction.

4. Disposable diaper according to any one of claims 1 to 3,

the distribution region is configured with the plurality of welding parts at even intervals.

5. The disposable diaper according to claim 4,

the plurality of welded portions are provided at uniform intervals throughout the area of the waist portion excluding the upper end portion and the other distribution area.

6. Disposable diaper according to any one of claims 1 to 3,

the stretchable non-woven fabric contains polyolefin and polyurethane.

7. Disposable diaper according to any one of claims 1 to 3,

the thickness of the stretchable non-woven fabric between the adjacent welded portions is greater than the thickness of the stretchable non-woven fabric at the central position of each welded portion.

8. The disposable diaper according to claim 7,

at least a portion of the stretchable nonwoven fabric between the welded portions adjacent to each other contacts the skin-side sheet or the non-skin-side sheet.

9. Disposable diaper according to any one of claims 1 to 3,

a convex portion is included in a region surrounded by a pair of the fusion-bonded portions adjacent to each other in the up-down direction and a pair of the fusion-bonded portions adjacent to each other in the lateral direction, and

the convex portion is provided on the skin side and the non-skin side.

10. Disposable diaper according to any one of claims 1 to 3,

the stretchable nonwoven fabric has a first region and a second region having a higher fiber density than that of the first region, and

11. A disposable diaper having an up-down direction, the disposable diaper comprising:

a skin side panel disposed on a skin side;

a non-skin side panel disposed on a non-skin side;

the disposable diaper includes an absorbent main body,

the skin side sheet, the stretchable nonwoven fabric and the non-skin side sheet in the absorbent main body joining region are provided with another distribution region in which the plurality of welded parts are distributed, and

a total area of the plurality of welds per unit area in the distribution region is less than a total area of the plurality of welds per unit area in the other distribution region.

12. The disposable diaper according to claim 11,

13. The disposable diaper according to claim 12,

14. The disposable diaper according to any one of claims 11 to 13,

the stretchable non-woven fabric contains polyolefin and polyurethane.

15. The disposable diaper according to any one of claims 11 to 13,

16. The disposable diaper according to claim 15,

17. The disposable diaper according to any one of claims 11 to 13,

the convex portion is provided on the skin side and the non-skin side.

18. The disposable diaper according to any one of claims 11 to 13,

19. A disposable diaper having an up-down direction, the disposable diaper comprising:

a skin side panel disposed on a skin side;

a non-skin side panel disposed on a non-skin side;

in the up-down direction, the first and second guide rails,

the fiber density of the stretchable nonwoven fabric in the upper end portion of the stretchable nonwoven fabric is greater than the fiber density of the stretchable nonwoven fabric in the central portion of the waist portion.