WO2019208480A1

WO2019208480A1 - Underpants-type absorbent article

Info

Publication number: WO2019208480A1
Application number: PCT/JP2019/016976
Authority: WO
Inventors: 秀晃槇; 井上　拓也; 紀子清水
Original assignee: ユニ・チャーム株式会社
Priority date: 2018-04-24
Filing date: 2019-04-22
Publication date: 2019-10-31
Also published as: CN112040918A; JPWO2019208480A1; JP7282752B2

Abstract

An underpants-type absorbent article (1) in which at least a ventral waist portion (20) has an upper-side portion (AU) above an absorbent body (10) in the vertical direction and a core-side portion (AC) overlapping an absorbent core (11A) in the front-rear direction, and n which a plurality of rubber threads (23) have an upper-side rubber thread (23u) disposed on the upper-side portion (AU) and a core-side rubber thread (23c) disposed on the core-side portion (AC), wherein the average value of the pitch between the upper-side rubber threads (23u) in the upper-side portion (AU) is less than the average value of the pitch between the core-side rubber threads (23c) in the core-side portion (AC), and the value obtained by dividing the magnitude of the force that extends the upper-side portion (AU) per unit length in the left-right direction by the vertical-direction length (H1) of the upper-side portion (AU) is less than the value obtained by dividing the magnitude of the force that extends the core-side portion (AC) per unit length in the left-right direction by the vertical-direction length (H3) of the core-side portion (AC).

Description

Pants-type absorbent article

The present invention relates to a pants-type absorbent article.

A pants-type disposable diaper is known as a pants-type absorbent article. For example, Patent Document 1 discloses a pants-type disposable diaper 1 having a ventral sheet member 2, a back sheet member 3, and an absorbent core 5. The abdominal sheet member 2 and the back sheet member 3 are each provided with a thread-like elastic member 7 that can extend in the width direction, and a waist elastic member 7W is disposed above the upper end portion 5W of the absorbent core 5. Prevents slippage.

JP 2013-13683 A

However, when an infant with a rounded body in the abdomen wears the pant-type disposable diaper 1 of Patent Document 1, the waist elastic member 7W may excessively tighten the abdomen of the infant.

The present invention has been made in view of the conventional problems as described above, and an object thereof is to provide a pants-type absorbent article that can be softly fitted to the wearer's abdomen.

The main invention for achieving the above object has an absorbent main body having an up-down direction, a left-right direction, and a front-rear direction, and an absorbent core and a pair of waistline portions, and the waistline portion is a skin side sheet portion A non-skin side sheet portion, and a plurality of rubber threads that can expand and contract in the left-right direction, and at least a ventral side waist portion of the pair of waist portions is an upper side above the absorbent main body in the vertical direction A plurality of upper rubbers intermittently arranged in the upper and lower direction on the upper part, and the core side. It is a pants-type absorbent article having a plurality of core side thread rubbers intermittently arranged in the vertical direction in the part, the average value of the pitch between the upper side rubber threads adjacent in the vertical direction in the upper part, On the side of the core The length of the upper portion in the vertical direction is smaller than the average pitch of the core side rubbers adjacent in the vertical direction, and the magnitude of the force for extending the upper portion by the unit length in the left and right direction is The value divided by the length is smaller than the value obtained by dividing the magnitude of the force that extends the core side part by the unit length in the left-right direction by the length in the vertical direction of the core side part. This is a mold absorbent article.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

According to the present invention, the upper part has a smaller contraction force than the core part side while making the surface of the wearer's skin easier to contact with the surface by making the pitch between the rubber threads smaller than the core part side. It is easy to reduce the risk of the rubber thread marks on the wearer's skin due to the rubber thread of the part.

FIG. 1 is a perspective view of a pants-type disposable diaper 1 (hereinafter “diaper”). FIG. 2 is a schematic plan view of the diaper 1 in the unfolded state and in the stretched state as viewed from the skin side surface side. FIG. 3 is an enlarged view of the ventral waist part 20 in FIG. 4 is an enlarged view of the back waistline portion 30 in FIG. FIG. 5 is a schematic diagram of a cross section taken along arrow AA in FIG. FIG. 6 is a schematic diagram of a cross section taken along line BB in FIG. FIG. 7 is a view for explaining a joint portion of the ventral waist part 20 in FIG. 3. FIG. 8 is a schematic diagram for explaining a cross section of a modified example of the ventral waist part 20. FIG. 9 is a schematic diagram for explaining a cross section of a modified example of the ventral waist part 20. FIG. 10 is a schematic diagram for explaining a cross section of a modified example of the ventral waist part 20. FIG. 11 is a perspective view of a pants-type disposable diaper 1 (hereinafter “diaper”). FIG. 12 is a schematic plan view of the diaper 1 in the unfolded state and in the stretched state as seen from the skin side surface side. FIG. 13 is an enlarged view of the ventral waist part 20 in FIG. FIG. 14 is an enlarged view of the back waistline portion 30 in FIG. FIG. 15 is a schematic cross-sectional view taken along line AA in FIG. FIG. 16 is a schematic cross-sectional view taken along the line BB in FIG. FIG. 17 is a view for explaining a joint portion of the ventral waist part 20 in FIG. FIG. 18 is a schematic diagram for explaining a cross section of a modified example of the ventral waist part 20. FIG. 19 is a schematic diagram for explaining a cross section of a modified example of the ventral waist part 20. FIG. 20 is a schematic diagram for explaining a cross section of a modified example of the ventral waist part 20. FIG. 21 is a schematic diagram for explaining a cross section of a modified example of the ventral waist part 20. FIG. 22 is a schematic diagram for explaining a cross section of a modified example of the ventral waist part 20.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
It has an up-down direction, a left-right direction, and a front-back direction, and has an absorptive main body provided with an absorptive core, and a pair of waistline parts, and the waistline part is a skin side sheet part, a non-skin side sheet part, and the left-right direction And at least a ventral side waistline part of the pair of waistline parts in the vertical direction is an upper part above the absorbent main body, the absorbent core, and the front-rear direction. And the plurality of thread rubbers are intermittently disposed in the upper and lower directions on the upper side and intermittently disposed in the upper and lower directions on the core side parts. A pant-type absorbent article having a plurality of core side thread rubbers, wherein an average value of pitches between the upper side thread rubbers adjacent in the vertical direction in the upper side part is adjacent in the vertical direction in the core side part. Core side yarn The value obtained by dividing the magnitude of the force that extends the upper part by a unit length in the left-right direction by the length in the up-down direction of the upper part is smaller than the average value of the pitch between the cores. The pants-type absorbent article is smaller than a value obtained by dividing the magnitude of the force that extends the unit length in the left-right direction by the length in the vertical direction of the core side portion.

According to such a pants-type absorbent article, the upper portion is made easier to make contact with the wearer's skin by making the pitch between the thread rubbers smaller than the core portion side, while the core portion side. However, it is easy to alleviate the risk of the rubber thread marks on the wearer's skin due to the rubber thread on the upper side having a small contraction force.

It has an up-down direction, a left-right direction, and a front-back direction, and has an absorptive main body provided with an absorptive core, and a pair of girth parts. And at least a ventral side waistline part of the pair of waistline parts in the vertical direction is an upper part above the absorbent main body, the absorbent core, and the front-rear direction. And the plurality of thread rubbers are intermittently disposed in the upper and lower directions on the upper side and intermittently disposed in the upper and lower directions on the core side parts. A pant-type absorbent article having a plurality of core side thread rubbers, wherein an average value of pitches between the upper side thread rubbers adjacent in the vertical direction in the upper side part is adjacent in the vertical direction in the core side part. Core side A pants-type absorbent article, wherein the average value of the diameters of the plurality of upper thread rubbers is smaller than the average value of the diameters of the plurality of core side thread rubbers. .

According to such a pants-type absorbent article, the upper portion is made easier to make contact with the wearer's skin by making the pitch between the thread rubbers smaller than the core portion side, while the core portion side. Also, the thread rubber on the upper side having a small diameter of the thread rubber makes it easier to reduce the risk of the thread rubber marks on the wearer's skin.

In such a pant-type absorbent article, it is preferable that the plurality of upper thread rubbers are provided continuously from one end to the other end of the ventral waist part in the left-right direction.

According to such a pants-type absorbent article, the upper thread rubber makes it easy to fit the abdomen of the wearer from one end to the other end of the abdomen waistline.

In such a pant-type absorbent article, it is desirable that a cut portion is not provided at an upper end portion of the ventral side waistline portion in the vertical direction, which is a central portion of the ventral side waistline portion in the left-right direction. .

According to such a pant-type absorbent article, the pant-type absorbent article that is not provided with a cut at the upper end of the abdomen waistline may cause a rubber thread mark on the wearer's skin due to the upper thread rubber. Can be reduced.

In this pant-type absorbent article, the ventral waist part overlaps the absorbent main body in the front-rear direction, and has an intermediate part above the absorbent core in the vertical direction, It is desirable that the thread rubber has an intermediate thread rubber disposed in the intermediate portion.

According to such a pants-type absorbent article, the intermediate thread rubber makes it easy to fit the intermediate portion to the wearer's body.

In such a pant-type absorbent article, the value obtained by dividing the magnitude of the force that extends the upper part by a unit length in the left-right direction is divided by the vertical length of the upper part. It is preferable that the magnitude of the force for extending the unit length in the left-right direction is smaller than the value obtained by dividing the intermediate portion by the length in the up-down direction.

According to such a pants-type absorbent article, the upper part is made to fit the wearer's skin while the upper part is softly abutted on the wearer's skin, so that the upper end part is made of rubber thread on the wearer's skin. The risk of excretion leaking from the absorbent main body can be reduced while preventing traces from being attached.

In such a pants-type absorbent article, the value obtained by dividing the magnitude of the force that extends the core side part by the unit length in the left-right direction is divided by the length in the up-down direction of the upper part. It is preferable that the magnitude of the force for extending the unit length in the left-right direction is smaller than the value obtained by dividing the intermediate portion by the length in the up-down direction.

According to such a pant-type absorbent article, the possibility of excrement leaking from the upper side of the absorbent main body can be further reduced by fitting the wearer's skin more firmly than the core side portion. it can.

Such a pant-type absorbent article, wherein the upper end portion of the non-skin side sheet portion has an upper sheet portion folded back to the skin side, and the lower end of the upper sheet portion is more than the upper end of the absorbent main body It is desirable to be located on the lower side.

According to such a pants-type absorbent article, since the difference in rigidity between the upper end and the upper side of the absorbent main body can be reduced, the risk of bending upward and downward from the upper end of the absorbent main body is reduced. be able to.

In this pant-type absorbent article, the upper part has an upper sheet part on the skin side from the skin side sheet part, and in the front-rear direction, the upper rubber thread is skinned from the skin side sheet part. And the core-side thread rubber is disposed on the non-skin side of the skin-side sheet part and on the skin side of the non-skin-side sheet part. Is desirable.

According to such a pants-type absorbent article, when the pants-type absorbent article is viewed from the non-skin side, the upper thread rubber of the waistline part is less visible than the core-side thread rubber, and the upper part is the wearer's This makes it easier to give the impression that the waistline will fit softly.

In this pant-type absorbent article, it is desirable that the upper part has a joint part for joining the skin side sheet part and the non-skin side sheet part.

According to such a pant-type absorbent article, the rigidity of the upper part can be further increased, so that the possibility that the upper part is turned up and down due to the shrinkage of the rubber thread can be reduced.

Such a pant-type absorbent article, wherein the abdomen side waistline part has a joint part for joining the skin side sheet part and the non-skin side sheet part, and the joint part has a shape along the vertical direction. It is desirable that the plurality of joint portions are intermittently arranged in the left-right direction.

According to such a pants-type absorbent article, the rigidity of the waistline portion in the vertical direction can be improved by the joint portion, so that the possibility that the waistline portion will fold up and down due to shrinkage of the rubber thread is reduced. Can do.

In this pant-type absorbent article, the back waistline portion of the pair of waistline portions is a backside upper portion overlapping the upper portion and a backside core side overlapping the core side portion in the vertical direction. The plurality of rubber threads are intermittently disposed in the vertical direction on the back core side and the plurality of back upper thread rubbers intermittently disposed in the vertical direction on the back upper portion. A plurality of dorsal core side rubber threads, and the magnitude of the force for extending the dorsal upper part by a unit length in the left-right direction is divided by the vertical length of the dorsal upper part. It is desirable that the value is larger than a value obtained by dividing the magnitude of the force for extending the back core side portion by the unit length in the left-right direction by the vertical length of the back core side portion.

According to such a pants-type absorbent article, it is easier to reduce the risk that the absorbent article being worn will fall down due to the back-side upper thread rubber, which has a greater extension force than the back core-side thread rubber. Become.

In such a pants-type absorbent article, the average value of the pitches of the dorsal upper thread rubbers adjacent to each other in the vertical direction in the dorsal upper side part is adjacent to the vertical direction in the dorsal core side part. It is desirable that the pitch is smaller than the average pitch between the back core side rubber threads.

According to such a pants-type absorbent article, the force to be stretched more than the back core side rubber thread is further reduced, and the risk of the absorbent article being worn by the back side upper rubber thread falling down is further reduced. It becomes easy.

In this pant-type absorbent article, the back waistline portion of the pair of waistline portions is a backside upper portion overlapping the upper portion and a backside core side overlapping the core side portion in the vertical direction. The plurality of rubber threads are intermittently disposed in the vertical direction on the back core side and the plurality of back upper thread rubbers intermittently disposed in the vertical direction on the back upper portion. The average value of the pitches of the upper thread rubbers adjacent to each other in the vertical direction in the upper part is the back of the upper part adjacent to the vertical part in the upper part of the back side. Less than the average value of the pitch between the side upper side rubber threads, the magnitude of the force that extends the upper part by the unit length in the left-right direction extends the back side upper part by the unit length in the left-right direction. It is desirable that it is less than the magnitude of the force.

According to such a pant-type absorbent article, the thread rubber at the back waistline makes it easy to fit the pant-type absorbent article around the wearer's waist, while the pitch of the thread rubber at the ventral waistline is reduced. The abdomen waistline, which is less than the average value of the side upper part, is in contact with the skin of the upper part and has a small force to stretch the rubber thread of the abdomen waistline, overtightening the wearer's abdomen Can not be.

=== First Embodiment ===
Hereinafter, as a pants-type absorbent article according to the present invention, a first embodiment will be described taking a disposable diaper for infants as an example. However, the pant-type absorbent article according to the present invention is not limited to disposable diapers for infants but can be used as disposable diapers for adults, sanitary shorts, and the like.

=== Configuration of the pants-type disposable diaper 1 ===
FIG. 1 is a perspective view of a pants-type disposable diaper 1 (hereinafter “diaper”). FIG. 2 is a schematic plan view of the diaper 1 in the unfolded state and the stretched state as seen from the skin side surface side. The “deployed state” means that the joint regions 2 of the both sides of the abdominal waistline 20 and the both sides of the back waistline 30 are separated and opened on both sides of the diaper 1 in the pants-type state. It is the state which developed the whole diaper 1 planarly. The “extended state” refers to a state in which the elastic member included in the diaper 1 is extended to such an extent that the heel of the diaper 1 cannot be visually recognized. Specifically, a state is shown in which each member constituting the diaper 1 (for example, a belly side waistline portion 20 described later) is extended until the dimensions thereof coincide with or close to the dimensions of the member itself. The CC line in FIG. 2 is a center line in the left-right direction.

The diaper 1 has an up-down direction, a left-right direction, and a front-rear direction in the pant-type state shown in FIG. 1, and a waistline opening BH and a pair of leg-hole openings LH are formed. In the vertical direction, the waistline opening BH side is the upper side, and the crotch side is the lower side. Moreover, the direction where the material which comprises the diaper 1 was laminated | stacked is called thickness direction, the side which contacts a wearer in thickness direction is called skin side, and the other side is called non-skin side. Note that the front-rear direction of the diaper 1 in the pants-type state corresponds to the thickness direction of the diaper 1 in the unfolded state.

The diaper 1 is a so-called three-piece type, and has an absorptive main body 10, a ventral waist part 20, and a back waist part 30. The ventral waist part 20 covers the wearer's belly side, and the back waist part 30 covers the wearer's back side.

2, the abdomen waistline 20 and the back waistline 30 are arranged such that their longitudinal directions are along the left-right direction of the diaper 1. And the edge part of the longitudinal direction one side of the absorptive main body 10 is joined to the center part of the abdominal side waist part 20 in the left-right direction by the adhesion parts H10 (FIG. 5), such as a hot melt, and the back side waist part in the left-right direction An end portion on the other side in the longitudinal direction of the absorbent main body 10 is joined to the central portion of 30 by an adhesive portion H10 (FIG. 5). Examples of the application pattern of the adhesive in the bonding portion H10 include known patterns such as a stripe pattern, a spiral pattern, and an Ω pattern. Moreover, joining of the abdominal waist part 20 and the back waist part 30 and the absorbent main body 10 is not limited to an adhesive, but may be a welding region fixed by thermal welding, ultrasonic welding, or the like.

The unfolded diaper 1 shown in FIG. 2 has a symmetrical shape with respect to the center line CC. Further, the absorbent main body 10 is folded in half at the approximate center C10 in the longitudinal direction so that the longitudinal direction of the absorbent main body 10 is along the vertical direction of the diaper 1, and both side ends of the ventral waist part 20 in the left-right direction of the diaper 1 1 and the both-sides edge part of the back side waist part 30 are joined by heat welding, ultrasonic welding, etc., and it becomes the diaper 1 of the underpants type state shown in FIG. .

The absorbent main body 10 includes an absorbent body 11, a liquid-permeable top sheet 12 disposed on the skin side of the absorbent body 11, and a liquid-impermeable back sheet disposed on the non-skin side of the absorbent body 11. 13 and an exterior sheet 14 disposed on the non-skin side with respect to the back sheet 13.

The absorber 11 has a substantially rectangular shape in plan view, and includes an absorbent core 11A that absorbs and retains excreted fluid such as urine, and a liquid-permeable core wrap sheet 11B that covers the absorbent core 11A. Examples of the absorbent core 11A include a liquid absorbent fiber such as pulp containing a super absorbent polymer (SAP) formed into a predetermined shape, for example, a substantially hourglass shape in plan view. Examples of the core wrap sheet 11B include liquid permeable sheets such as tissue paper and nonwoven fabric.

Moreover, as shown in FIG. 2, the leg periphery elastic member 15 is provided in the both sides of the absorptive main body 10 in the left-right direction, and the diaper 1 fits a wearer's leg periphery. The leg-hole elastic member 15 is fixed in an elongated state in the longitudinal direction of the absorbent main body 10 between the exterior sheets 14 that are folded inward in the left-right direction to form two layers, for example. Examples of the leg elastic member 15 include a rubber thread and an elastic sheet.

The ventral waist part 20 and the back waist part 30 each have a substantially rectangular shape. A cut portion is not provided at the upper end portion of the abdominal waist portion 20 at the central portion in the left-right direction of the abdominal waist portion 20. A cut part means the shape etc. which were dented from the upper end part of the ventral trunk part 20 downward, for example. Similarly, a cut portion is not provided at the upper end portion of the abdominal waistline portion 20 at the central portion of the backside waistline portion 30 in the left-right direction. The ventral waist part 20 has a skin side sheet (skin side sheet part) 21, a non-skin side sheet 22, and a plurality of thread rubbers 23, and the back side waist part 30 has a skin side sheet 31 and a non-skin. A side sheet 32 and a plurality of thread rubbers 33 are provided. The skin-

side sheets

21 and 31 and the non-skin-

side sheets

22 and 32 are joined by an adhesive such as hot melt. Details of the plurality of

rubber threads

23 and 33 will be described later.

The

non-skin side sheets

22 and 32 are arranged on the non-skin side of the

skin side sheets

21 and 31. The skin-

side sheets

21 and 31 and the non-skin-

side sheets

22 and 32 are arranged on the non-skin side with respect to the absorbent main body 10. The upper ends of the non-skin-

side sheets

22 and 32 constitute folded

portions

22u and 32u that are folded downward in order to improve the touch and durability, respectively. The non-skin side sheet 22 has a non-skin side sheet part 22n and a folded part 22u.

Examples of the skin-

side sheets

21 and 31 and the non-skin-

side sheets

22 and 32 are SMS nonwoven fabric (spunbond / meltblown / spunbond nonwoven fabric), spunbond nonwoven fabric, air-through nonwoven fabric, plastic sheet, perforated plastic sheet, and laminate sheets thereof. Non-stretchable sheet can be used.

Further, the ventral waist part 20 is provided with a sheet member 24 on the skin side from the folded part 22u. The sheet member 24 is joined to the absorbent main body 10 and the folded portion 22u by an adhesive portion H24 (see FIG. 5) so as to straddle the upper end of the absorbent main body 10 on the stomach side. Similarly, the back waistline part 30 is provided with the sheet | seat member 34 on the skin side rather than the folding | returning part 32u. The sheet member 34 is joined to the absorbent main body 10, the folded portion 32u, and the skin side sheet 31 with an adhesive H34 (see FIG. 6) so as to straddle the upper end of the absorbent main body 10 on the back side. The

sheet members

24 and 34 are rectangular sheet members made of nonwoven fabric or the like. The

sheet members

24 and 34 prevent the upper and lower ends of the absorbent main body 10 from coming into direct contact with the wearer's skin, thereby making the abdominal waistline 20 and the back waistline 30 more comfortable to wear. It can be made good. Further, the

sheet members

24 and 34 can further strengthen the bonding between the abdominal waistline portion 20 and the backside waistline portion 30 and the absorbent main body 10.

=== About the

rubber bands

23 and 33 ===
FIG. 3 is an enlarged view of the ventral waist part 20 in FIG. 4 is an enlarged view of the back waistline portion 30 in FIG. The plurality of

thread rubbers

23, 33 are

thread rubbers

23, 33 to which an adhesive such as hot melt is applied from the upper end part to the lower end part between the

skin side sheets

21, 31 and the

non-skin side sheets

22, 32. Are arranged side by side and fixed in an extended state in the left-right direction. Therefore, the abdominal side waistline portion 20 and the back side waistline portion 30 are joined to each other, and expand and contract in the left-right direction to fit the wearer's waistline.

As shown in FIG. 3, the ventral waist part 20 has a ventral upper part AU, a ventral intermediate part AM, and a ventral core side part AC in order from the top. Specifically, the abdominal side upper part AU is a rectangular region above the absorbent main body 10 in the vertical direction in the abdominal side waist part 20. The ventral core side part AC is a rectangular region that overlaps the absorbent core 11 A in the front-rear direction in the ventral waist part 20. The ventral intermediate portion AM is a rectangular region that overlaps the absorbent main body 10 and is above the absorbent core 11A.

As shown in FIG. 4, the back waistline portion 30 includes a back side upper portion BU, a back side intermediate portion BM, and a back side core side portion BC in order from the upper side. Specifically, in the diaper 1 in the pants-type state, the region of the back waistline portion 30 that overlaps the abdominal side upper portion AU of the abdominal waistline portion 20 in the front-rear direction is the backside upper portion BU, and the ventral waistline portion The region of the back waistline portion 30 that overlaps the 20 ventral intermediate portions AM in the front-rear direction is the back intermediate portion BM, and the back waistline portion that overlaps the ventral core side portion AC of the ventral waistline portion 20 in the front-rear direction. The region 30 is the back core side BC.

FIG. 5 is a schematic diagram of a cross section taken along arrow AA in FIG. FIG. 6 is a schematic diagram of a cross section taken along line BB in FIG. In FIGS. 5 and 6, the dimensions are appropriately changed so that the configuration can be easily understood in the thickness direction.

As shown in FIG. 5, the abdominal side waistline portion 20 includes, in order from the skin side, the sheet member 24, the folded portion 22 u, the skin side thread rubber 23 u, the skin side sheet 21, the non-skin side thread rubber 23 c, and the adhesive portion (joint portion). ) H20 and a non-skin side sheet portion 22n. Of the rubber thread 23 of the ventral waist part 20, the ventral upper part AU has a ventral upper thread rubber 23t, the ventral intermediate part AM has a ventral intermediate thread rubber 23m, and the ventral core side part AC has a ventral side. The core side thread rubber 23d is arranged. Specifically, a plurality of skin-side thread rubbers 23u are disposed as the ventral-side upper thread rubber 23t, and a plurality of skin-side thread rubbers 23u and a plurality of non-skin-side thread rubbers 23c are disposed as the abdominal-side intermediate thread rubber 23m. A plurality of non-skin side thread rubbers 23c are arranged as the ventral core side thread rubber 23d.

As shown in FIG. 6, the back waistline portion 30 includes a sheet member 34, a folded portion 32 u, a skin side sheet 31, a thread rubber 33, and a non-skin side sheet portion 32 n in order from the skin side. Of the rubber thread 33 of the back waist part 30, the back side upper part BU is the back side upper part rubber thread 33t, the back side intermediate part BM is the back side intermediate thread rubber 33m, and the back side core side part BC is the back side. The core side rubber thread 33d is arranged. The rubber thread 33 of the back waistline portion 30 does not have a skin side rubber thread like the abdominal waistline portion 20, and all the rubber thread 33 is attached to the non-skin side thread rubber 23 c of the abdominal waistline portion 20. It is arranged at the corresponding position.

The folded portion 22u in the ventral waist part 20 is also referred to as “upper sheet portion 22s” provided on the skin side with respect to the skin-side thread rubber 23u. The lower end of the folded portion 22u is preferably positioned below the upper end of the absorbent main body 10. In other words, the folded portion 22u may be arranged not only in the ventral upper portion AU but also in the ventral intermediate portion AM. As a result, the difference in rigidity at the upper end of the absorbent main body 10 caused by the upper end portion of the absorbent main body 10 having relatively high rigidity can be relaxed, so that the upper end of the absorbent main body 10 is bent. Fear can be reduced.

The skin-side thread rubber 23u is disposed on the skin side of the skin-side sheet 21 and on the non-skin side of the folded portion 22u in the front-rear direction, and the non-skin-side thread rubber 23c is non-skinless than the skin-side sheet 21. It is preferable that it is arrange | positioned by the side and the skin side rather than the non-skin side sheet | seat part 22n. That is, since the skin-side thread rubber 23u is on the skin side from the skin-side sheet 21 and the non-skin-side thread rubber 23c is on the non-skin side from the skin-side sheet 21, the skin-side thread rubber 23u is non-skin-side thread rubber 23c. It is located on the skin side. In the abdominal side upper part AU, the skin side sheet 21, the adhesive part H20, and the non-skin side sheet part 22n are arranged on the non-skin side from the skin side thread rubber 23u. Accordingly, when the diaper 1 in a pants-type state, particularly in a worn state, is viewed from the non-skin side, the skin-side thread rubber 23u is viewed through more materials than the non-skin-side thread rubber 23c. The skin-side thread rubber 23u of the upper side AU of the ventral side can be made harder to see than the non-skin-side thread rubber 23c, and the diaper 1 is softly fitted without excessively tightening the wearer's waistline. It becomes easy to give. Further, as shown in FIGS. 2 and 3, the skin-side thread rubber 23u and the non-skin-side thread rubber 23c, which are the intermediate thread rubber 23m, are continuously connected from one end to the other end of the ventral waist part 20 in the left-right direction. The non-skin side thread rubber 23c that can be fitted to the wearer's skin from one end part to the other end part of the abdominal waist part 20 and is easier to visually recognize than the skin side thread rubber 23u. Thus, it is easy to give an impression that the contraction force of the non-skin side rubber thread 23c is working more strongly on the ventral core side part AC.

Also, in the ventral upper side AU, it is preferable that the skin side sheet 21 and the non-skin side sheet part 22n are bonded by an adhesive part H20 such as hot melt. The abdominal side upper part AU may be lowered so that the upper end part of the abdominal side waistline part 20 is wound by the contraction of the skin side thread rubber 23u. In this regard, in the abdominal side upper part AU, the rigidity of the abdominal side upper part AU is improved by the rigidity of the adhesive part H20 by bonding the skin side sheet 21 and the non-skin side sheet part 22n using an adhesive. It is possible to reduce the risk of the upper end of the ventral waist part 20 turning up. Note that the bonding portion H20 is not necessarily limited to a bonding portion using an adhesive, and may be a bonding portion formed by, for example, heat welding or ultrasonic welding.

As shown in FIG. 5, the average value of the pitch Pt between the ventral upper side thread rubbers 23t is smaller than the average value of the pitch Pd between the ventral core side thread rubbers 23d, and the ventral upper side part AU is unit length in the left-right direction. The value (F1 / H1) obtained by dividing the magnitude F1 of the force to extend by the length H1 in the vertical direction of the ventral upper side AU is the force to extend the ventral core side AC by the unit length in the horizontal direction. Is smaller than the value (F3 / H3) obtained by dividing the size F3 by the length H3 in the vertical direction of the ventral core side part AC (F1 / H1 <F3 / H3).

Further, the average value of the diameters of the plurality of ventral upper side rubber threads 23t is smaller than the average value of the diameters of the plurality of ventral core side rubber threads 23d. To put it flatly, the ventral upper side rubber thread 23t is thinner than the ventral core side thread rubber 23d. Therefore, the contraction force in the left-right direction of the ventral upper thread rubber 23t is smaller than the contraction force in the left-right direction of the ventral core-side thread rubber 23d.

The pitch Pt between the ventral upper thread rubbers 23t is the length between the centers of the ventral upper thread rubbers 23t adjacent in the vertical direction. The pitch Pt between the stomach-side upper thread rubbers 23t is also the pitch between the skin-side thread rubbers 23u. In the present embodiment, the average value of the pitch Pt is 2.5 mm, and the pitch Pt is preferably 1.0 mm to 4.0 mm. The pitch Pd between the ventral core side rubber threads 23d is the length between the centers of the ventral core side rubber threads 23c adjacent in the vertical direction. The pitch Pd between the ventral core side thread rubbers 23d is also the pitch of the non-skin side thread rubber 23c. In the present embodiment, the average value of the pitch Pd is 7.0 mm, and the pitch Pd is preferably 5.0 mm to 10.0 mm. In the present embodiment, the pitches Pt and the pitches Pd are set at substantially equal intervals, but are not limited thereto. Each pitch Pt, Pd can be set to an arbitrary value. Moreover, although the stomach side upper side rubber thread 23t and the stomach side core side thread rubber 23d have the substantially same thickness, respectively, it is not restricted to this. The belly side upper thread rubber 23t and the ventral core side thread rubber 23d may each have an arbitrary thickness.

The force to extend in the left-right direction, that is, the “extension force” in the left-right direction is the “contraction force” in the left-right direction. Therefore, when the abdominal side upper part AU is extended with a predetermined force toward the outer side in the left-right direction, the abdominal side upper part AU tends to contract toward the inner side in the left-right direction. The force toward the inside in the left-right direction is the “contraction force”. For example, the extension force required to change the diaper 1 in the natural state into the diaper 1 in the extended state is equal to the contraction force that causes the diaper 1 in the extended state to return to the diaper 1 in the natural state. Hereinafter, the term “stretching force” may be used instead of “stretching force”. That is, the contraction force acting in the left-right direction per unit length in the vertical direction in the ventral upper side AU is smaller than the contraction force acting in the left-right direction per unit length in the vertical direction in the ventral core side part AC. The same applies to the force for extending each part of the back waistline 30 in the left-right direction.

The average value of the pitch Pt between the ventral upper side rubber threads 23t is made smaller than the average value of the pitch Pd between the ventral core side rubber threads 23d, thereby wearing the ventral upper side part AU rather than the ventral core side part AC. Since it becomes easy to contact a person's skin on the surface, the possibility that the ventral upper side rubber thread 23t locally tightens the wearer's skin can be reduced.

However, generally, the smaller the average value of the pitches Pt between the ventral upper thread rubbers 23t, the greater the number of ventral upper thread rubbers 23t and the greater the contraction force of the ventral upper part AU. Tend. In particular, since the infant has a body shape with a rounded abdomen, it is easily affected by the contraction of the abdominal upper thread rubber 23t. Moreover, if the contractive force of the entire abdomen waist part 20 is reduced, the diaper 1 being worn may not fit the wearer's abdomen and may fall downward.

In this respect, the diaper 1 has a contracting force acting in the left-right direction per unit length in the up-down direction in the ventral upper side AU, and a contracting force acting in the left-right direction per unit length in the up-down direction in the ventral core side part AC. It is smaller. The ventral upper side AU having a smaller contraction force makes a softer contact with the wearer's abdomen. Accordingly, it is possible to reduce the fact that the wearer's abdomen is excessively tightened due to the contraction of the abdominal upper thread rubber 23t and the trace of the abdominal upper thread rubber 23t is attached to the wearer's skin. On the other hand, the abdominal core side portion AC having a larger contraction force can be more strongly fitted to the wearer's waist, and the risk that the diaper 1 will fall downward can be reduced. Therefore, the risk of excrement leaking can be reduced.

Further, it is preferable that the middle thread rubber 23m is also disposed in the ventral intermediate portion AM. By the contraction of the intermediate thread rubber 23m, the absorbent main body 10 can be easily fitted to the wearer's abdomen. Furthermore, as shown in FIG. 5, the abdominal side intermediate portion AM includes the skin side thread rubber 23u and the non-skin side thread rubber 23c as the intermediate thread rubber 23m, so that the absorbent main body 10 is fitted to the wearer's abdomen. It becomes easy. Since the ventral intermediate portion AM is the upper end portion on the ventral side of the absorbent main body 10, the upper end portion on the ventral side of the absorbent main body 10 is more closely attached to the skin of the wearer, The risk of excrement leaking from the upper end can be further reduced.

A value (F1 / H1) obtained by dividing the magnitude F1 of the force that extends the ventral upper side AU by the unit length in the left-right direction by the vertical length H1 of the ventral upper side AU is the ventral intermediate part AM. It is preferably smaller than the value (F2 / H2) obtained by dividing the size F2 to be extended by the unit length in the left-right direction by the length H2 in the vertical direction of the ventral intermediate portion AM (F1 / H1 <F2 / H2). By this, while the ventral intermediate thread rubber 23m fits the absorbent main body 10 to the wearer's abdomen and prevents the excrement from leaking, the ventral upper part AU having a smaller contractive force than the ventral intermediate part AM is Since the wearer's skin comes into contact with the skin softly, the wearer's abdomen can be excessively tightened to reduce the mark on the ventral upper thread rubber 23t.

Furthermore, the value (F3 / H3) obtained by dividing the magnitude F3 of the force that extends the ventral core side part AC by the unit length in the left-right direction by the vertical length H3 of the ventral core side part AC is It is preferably smaller than the value (F2 / H2) obtained by dividing the size F2 for extending the intermediate portion AM by the unit length in the left-right direction by the vertical length H2 of the ventral intermediate portion AM (F3 / H3 <F2 /). H2). That is, it is preferable that the contracting force acting in the left-right direction per unit length in the up-down direction in the ventral core side part AC is smaller than the contracting force acting in the left-right direction per unit length in the up-down direction in the ventral intermediate part AM. As a result, the ventral intermediate portion AM can fit the absorbent main body 10 to the wearer's skin more strongly than the ventral core side portion AC, so that there is a greater risk of excrement leaking from the upper side of the absorbent main body 10. It can be reduced.

The value (F4 / H1) obtained by dividing the magnitude F4 of the force for extending the back side upper part BU by the unit length in the left-right direction by the vertical length H1 of the back side upper part BU (F4 / H1) is the back core side part BC Is preferably smaller than the value (F6 / H3) obtained by dividing the magnitude of the force F6 that extends the unit length in the left-right direction by the length H3 in the vertical direction of the dorsal core side part BC (F4 / H1 <F6 / H3). In addition, since the back side upper part BU overlaps with the abdominal side upper part AU whose vertical length is H1 in the front-rear direction, the vertical length of the back side upper part BU is H1, and the back core side part Since BC overlaps in the front-rear direction with the ventral core side AC having a vertical length of H3, the vertical length of the dorsal core side BC is H3. Furthermore, as shown in FIG. 6, it is preferable that the average value of the pitch Pj between the back side upper side rubber threads 33t is smaller than the average value of the pitch Pk between the back side core side rubber threads 33d. That is, since the back side upper part BU can fit the wearer's waist more firmly than when the contraction force of the back side upper thread rubber 33t is smaller than the contraction force of the back core side thread rubber 33d, The fear that the diaper 1 during wearing may fall downward can be further reduced.

The average value of the pitch Pt between the ventral upper thread rubbers 23t is smaller than the average value of the pitch Pj between the dorsal upper thread rubbers 33t, and the force of extending the ventral upper part AU by a unit length in the left-right direction. More preferably, the size F1 is equal to or less than the size F4 of the force that extends the back side upper portion BU by the unit length in the left-right direction (F1 ≦ F4). Thereby, in the diaper 1 of a pants-type state, the back side upper part BU which forms a ring shape with the abdominal side upper part AU contacts the wearer's skin more strongly than the back side core side part BC. Therefore, the upper side AU of the diaper 1 is softly in contact with the abdomen of the rounded wearer, and the upper back part BU is more strongly applied to the skin on the back side of the relatively flat shape. The abutment can reduce the risk that the diaper 1 will fall downward.

The ventral waist part 20 has a joint for joining the skin side sheet 21 and the non-skin side sheet 22, and in the diaper 1, is an adhesive part H 20. FIG. 7 is a view for explaining a joint portion of the ventral waist part 20 in FIG. 3. In FIG. 7, the rubber thread 23 is omitted for convenience. As shown in FIG. 7, the plurality of bonding portions H 20 each have a shape along the vertical direction, and are intermittently arranged in the horizontal direction. An adhesive is continuously applied to the adhesive portion H20. Since the adhesive portion H20 made of an adhesive has a relatively high rigidity, the rigidity in the vertical direction of the abdominal side waistline portion 20, particularly the abdominal side upper portion AU, can be improved. By improving the rigidity of the ventral upper side AU, the risk of the upper end of the ventral waist part 20 being turned up can be further reduced. In addition, joining of the skin side sheet | seat 21 and the non-skin side sheet | seat 22 is not restricted to adhesion | attachment with an adhesive agent. For example, it may be performed by welding or fusion. Moreover, the joining part does not necessarily need to be continuous, and may be a plurality of welding parts or fusion parts arranged intermittently in the vertical direction.

The magnitude F1 of extending the ventral upper side AU by the unit length in the left-right direction, the magnitude F2 of extending the ventral intermediate part AM by the unit length in the left-right direction, and the ventral core side AC in the left-right direction The amount of force F3 that extends by the unit length, the amount of force F4 that extends the back side upper portion BU by the unit length in the left-right direction, and the back side core side portion BC by the unit length in the left-right direction. An autograph type tensile tester (for example, AG-1KN1) manufactured by Shimadzu Corporation can be used to measure each contraction force of the magnitude of force F6.

First, the length (extension dimension) in the left-right direction between the inner sides in the left-right direction of the joint region 2 of the ventral waist part 20 and the back waist part 30 of the stretched diaper 1 is measured in advance. Then, the right and left side joints of the diaper 1 including the joint region 2 are cut with a cutter, and the ventral upper waist part AU, the ventral middle part AM, and the ventral core side part AC are connected to the spine. The back upper part BU and the back core side part BC are respectively cut off from the side waistline part 30 and used as samples.

When cutting the ventral upper waist part 20 from the ventral upper waist part AU, the ventral middle part AM, the ventral core side part AC, the back side waist part 30 from the back side upper part BU and the back core side part BC, respectively. It cuts out with the absorptive main body 10 joined to the ventral waist part 20 and the back waist part 30. For example, the sample of the ventral middle part AM is obtained by cutting the absorbent main body 10 not including the absorbent core 11A together with the ventral waist part 20, and the sample of the ventral core side part AC is the ventral waist part. 20, the absorbent main body 10 including the absorbent core 11 A is cut out.

Next, one end of each sample is sandwiched between the fixed chuck and the other end is sandwiched between the movable chucks and stretched to a length of about 90% of the stretched dimension at a speed of 300 mm / min. The tensile load (N) when contracted to a size of 75% can be obtained and converted into a force (N / mm) per unit length (mm) to be a force that extends by the unit length.

In addition, the magnitude | size of the force which expands each part (AU, AM, AC, BU, BM, BC) to the left-right direction is not only the thickness of the

thread rubber

23 and 33, but also the spring constant of the thread rubber and the number of thread rubbers. It is also possible to adjust according to the type and number of materials stacked in each part (AU, AM, AC, BU, BM, BC).

=== Modification ===
FIG. 8 to FIG. 10 are schematic diagrams for explaining a cross section of a modified example of the ventral waist part 20. In the above-described embodiment, the skin-side thread rubber 23u and the non-skin-side thread rubber 23c are arranged as the thread rubber 23 in the ventral waist part 20, and the folded-back part 22u is provided on the skin side from the skin-side thread rubber 23u. It is not limited to this.

For example, as shown in FIGS. 8 and 9, only the non-skin side thread rubber 23c may be disposed as the abdominal side intermediate thread rubber 23m, and the skin side thread rubber 23u may not be disposed. Although not shown, only the skin-side thread rubber 23u may be disposed as the abdominal-side intermediate thread rubber 23m, and the non-skin-side thread rubber 23c may not be disposed.

Moreover, as shown in FIG. 8, you may have the upper side sheet | seat part 22s which consists of a member different from the non-skin side sheet | seat 22 in the skin side from the skin side thread rubber 23u. The upper sheet portion 22s and the folded-back portion 22u only need to cover at least the skin-side thread rubber 23u from the skin side, and as shown in FIG. 8, the skin-side thread rubber 23u is disposed in the ventral-side upper area AU. Even in this case, the upper sheet portion 22s (folded portion u) may be provided across the ventral upper portion AU and the ventral intermediate portion AM. Similarly, the upper sheet portion 22s (folded portion u) may be provided across the ventral upper portion AU, the ventral intermediate portion AM, and the ventral core side portion AC.

Furthermore, as shown in FIG. 9, the structure which does not arrange | position the skin side rubber thread 23u may be sufficient. Even in such a case, the average value of the pitch Pt between the ventral upper side thread rubbers 23t is made smaller than the average value of the pitch Pd between the ventral core side thread rubbers 23d, and the ventral upper side part AU is made to be worn by the wearer. The contraction force acting in the left-right direction per unit length in the up-and-down direction in the ventral upper side AU while making it easy to make contact with the surface in the left-and-right direction in the left-right direction per unit length in the up-and-down direction in the ventral core side part AC By making it smaller than the working contraction force, excessive tightening in the ventral upper side AU can be reduced. As shown in FIG. 9, in the abdominal side upper part AU, a plurality of members such as a skin side sheet 21 and a folded part 22 u (upper sheet part 22 s) are stacked on the skin side from the abdominal side upper rubber thread 23 t. Even if the ventral upper side rubber thread 23t contracts, the ventral upper side part AU can be made to have a softer skin contact.

As shown in FIG. 10, not only the non-skin side sheet 22 but also the skin side sheet 21 may have a folded portion. By setting it as such a structure, since the material in the upper end part of the abdominal side waist part 20 can be increased, the skin contact by shrinkage | contraction of the abdominal side upper side rubber thread 23t can be relieve | moderated more, and the abdominal side upper side The fear that the rubber thread 23t may excessively tighten the wearer's skin can be reduced.

=== Second Embodiment ===
Hereinafter, as a pants-type absorbent article according to the present invention, a second embodiment will be described taking a disposable diaper for infants as an example. However, the pant-type absorbent article according to the present invention is not limited to disposable diapers for infants but can be used as disposable diapers for adults, sanitary shorts, and the like. In the following description, the skin-side thread rubber 23u is also referred to as “upper thread rubber 23u”, and the non-skin-side thread rubber 23c is also referred to as “core-side thread rubber 23c”.

=== Configuration of the pants-type disposable diaper 1 ===
FIG. 11 is a perspective view of a pants-type disposable diaper 1 (hereinafter “diaper”). FIG. 112 is a schematic plan view of the diaper 1 in the unfolded state and the stretched state as seen from the skin side surface side. The “deployed state” means that the joint regions 2 of the both sides of the abdominal waistline 20 and the both sides of the back waistline 30 are separated and opened on both sides of the diaper 1 in the pants-type state. It is the state which developed the whole diaper 1 planarly. The “extended state” refers to a state in which the elastic member included in the diaper 1 is extended to such an extent that the heel of the diaper 1 cannot be visually recognized. Specifically, a state is shown in which each member constituting the diaper 1 (for example, a belly side waistline portion 20 described later) is extended until the dimensions thereof coincide with or close to the dimensions of the member itself. The CC line in FIG. 12 is a center line in the left-right direction.

The diaper 1 has an up-down direction, a left-right direction, and a front-rear direction in the pant-type state shown in FIG. 11, and a waistline opening BH and a pair of leg-hole openings LH are formed. In the vertical direction, the waistline opening BH side is the upper side, and the crotch side is the lower side. Moreover, the direction where the material which comprises the diaper 1 was laminated | stacked is called thickness direction, the side which contacts a wearer in thickness direction is called skin side, and the other side is called non-skin side. Note that the front-rear direction of the diaper 1 in the pants-type state corresponds to the thickness direction of the diaper 1 in the unfolded state.

In the diaper 1 in the unfolded state shown in FIG. 12, the abdominal side waistline portion 20 and the back side waistline portion 30 are arranged such that their longitudinal directions are along the left-right direction of the diaper 1. And the edge part of the longitudinal direction one side of the absorptive main body 10 is joined to the center part of the abdominal side waist part 20 in the left-right direction by the adhesion parts H10 (FIG. 15), such as a hot melt, and the back side waist part in the left-right direction The end of the absorbent main body 10 on the other side in the longitudinal direction is joined to the central portion of 30 by an adhesive portion H10 (FIG. 15). Examples of the application pattern of the adhesive in the bonding portion H10 include known patterns such as a stripe pattern, a spiral pattern, and an Ω pattern. Moreover, joining of the abdominal waist part 20 and the back waist part 30 and the absorbent main body 10 is not limited to an adhesive, but may be a welding region fixed by thermal welding, ultrasonic welding, or the like.

The diaper 1 in the unfolded state shown in FIG. 12 has a symmetrical shape with respect to the center line CC. Further, the absorbent main body 10 is folded in half at the approximate center C10 in the longitudinal direction so that the longitudinal direction of the absorbent main body 10 is along the vertical direction of the diaper 1, and both side ends of the ventral waist part 20 in the left-right direction of the diaper 1 The pants-type diaper 1 shown in FIG. 11 is formed by joining the end portion and both end portions of the back waistline portion 30 by heat welding, ultrasonic welding, or the like to form a pair of joining regions 2. .

Moreover, as shown in FIG. 12, the leg periphery elastic member 15 is provided in the both sides of the absorptive main body 10 in the left-right direction, and the diaper 1 fits a wearer's leg periphery. The leg-hole elastic member 15 is fixed in an elongated state in the longitudinal direction of the absorbent main body 10 between the exterior sheets 14 that are folded inward in the left-right direction to form two layers, for example. Examples of the leg elastic member 15 include a rubber thread and an elastic sheet.

The ventral waist part 20 has a skin side sheet (skin side sheet part) 21, a non-skin side sheet 22, and a plurality of thread rubbers 23, and the back side waist part 30 has a skin side sheet 31 and a non-skin. A side sheet 32 and a plurality of thread rubbers 33 are provided. The skin-

side sheets

21 and 31 and the non-skin-

side sheets

rubber threads

23 and 33 will be described later.

The

non-skin side sheets

22 and 32 are arranged on the non-skin side of the

skin side sheets

21 and 31. The skin-

side sheets

21 and 31 and the non-skin-

side sheets

22 and 32 constitute folded

portions

Examples of the skin-

side sheets

21 and 31 and the non-skin-

side sheets

Further, the ventral waist part 20 is provided with a sheet member 24 on the skin side from the folded part 22u. The sheet member 24 is joined to the absorbent main body 10 and the folded portion 22u by an adhesive portion H24 (see FIG. 15) so as to straddle the upper end of the absorbent main body 10 on the stomach side. Similarly, the back waistline part 30 is provided with the sheet | seat member 34 on the skin side rather than the folding | returning part 32u. The sheet member 34 is joined to the absorbent main body 10, the folded portion 32u, and the skin side sheet 31 with an adhesive H34 (see FIG. 16) so as to straddle the upper end of the absorbent main body 10 on the back side. The

sheet members

24 and 34 can further strengthen the bonding between the front waistline portion 20 and the back waistline portion 30 and the absorbent main body 10.

=== About the

rubber bands

23 and 33 ===
FIG. 13 is an enlarged view of the ventral waist part 20 in FIG. FIG. 14 is an enlarged view of the back waistline portion 30 in FIG. The plurality of

thread rubbers

23, 33 are

thread rubbers

skin side sheets

21, 31 and the

non-skin side sheets

As shown in FIG. 13, the ventral waist part 20 has a ventral upper part AU, a ventral intermediate part AM, and a ventral core side part AC in order from the top. Specifically, the abdominal side upper part AU is a rectangular region above the absorbent main body 10 in the vertical direction in the abdominal side waist part 20. The ventral core side part AC is a rectangular region that overlaps the absorbent core 11 A in the front-rear direction in the ventral waist part 20. The ventral intermediate portion AM is a rectangular region that overlaps the absorbent main body 10 and is above the absorbent core 11A.

As shown in FIG. 14, the back waistline portion 30 includes a back side upper portion BU, a back side intermediate portion BM, and a back side core side portion BC in order from the upper side. Specifically, in the diaper 1 in the pants-type state, the region of the back waistline portion 30 that overlaps the abdominal side upper portion AU of the abdominal waistline portion 20 in the front-rear direction is the backside upper portion BU, and the ventral waistline portion The region of the back waistline portion 30 that overlaps the 20 ventral intermediate portions AM in the front-rear direction is the back intermediate portion BM, and the back waistline portion that overlaps the ventral core side portion AC of the ventral waistline portion 20 in the front-rear direction. The region 30 is the back core side BC.

FIG. 15 is a schematic diagram of a cross section taken along arrow AA in FIG. FIG. 16 is a schematic cross-sectional view taken along the line BB in FIG. In FIGS. 15 and 16, the dimensions are changed as appropriate so that the configuration can be easily understood in the thickness direction.

As shown in FIG. 15, the abdominal side waistline portion 20 includes, in order from the skin side, the sheet member 24, the folded portion 22 u, the upper thread rubber 23 u, the skin side sheet 21, the core side thread rubber 23 c, and the bonding portion (joining portion) H20. And a non-skin side sheet portion 22n. Of the rubber thread 23 of the ventral waist part 20, an upper thread rubber 23u is disposed on the ventral upper part AU and the ventral intermediate part AM, and a core is provided on the ventral core side part AC and the ventral intermediate part AM. Side thread rubber 23c is disposed. The upper thread rubber 23u and the core thread rubber 23c arranged in the ventral intermediate portion AM are also referred to as intermediate thread rubber 23m. The folded portion 22u is also referred to as an “upper sheet portion 22s” provided on the skin side from the upper thread rubber 23u.

As shown in FIG. 16, the back waistline portion 30 includes a sheet member 34, a folded portion 32u, a skin side sheet 31, a rubber thread 33, and a non-skin side sheet portion 32n in order from the skin side. The rubber thread 33 of the back waistline part 30 does not have the upper side rubber thread like the ventral waistline part 20.

The upper thread rubber 23u is disposed on the skin side of the skin side sheet 21 in the front-rear direction, on the non-skin side of the folded portion 22u, and on the non-skin side of the absorbent main body 10, and the core side rubber thread 23c is The skin side sheet 21 is disposed on the non-skin side, the non-skin side sheet portion 22n is disposed on the skin side, and the absorbent main body 10 is disposed on the non-skin side. That is, the upper thread rubber 23u is closer to the skin side than the skin side sheet 21, and the core side thread rubber 23c is closer to the skin side than the skin side sheet 21, so the upper thread rubber 23u is closer to the skin side than the core side thread rubber 23c. positioned. In the abdominal side upper part AU, the skin side sheet 21, the adhesive part H20, and the non-skin side sheet part 22n are arranged on the non-skin side from the upper thread rubber 23u. 12 and 13, the upper thread rubber 23u and the core side thread rubber 23c, which are the intermediate thread rubber 23m, are continuously provided from one end to the other end of the ventral waist part 20 in the left-right direction. Is provided.

By arranging the upper thread rubber 23u and the core side rubber thread 23c as described above, when the diaper 1 in a pants-type state, particularly a worn state, is viewed from the non-skin side, the upper side thread rubber 23u is the core side thread rubber. Since it will visually recognize through more materials than 23c, the upper side rubber thread 23u of the abdominal side upper part AU can be made harder to visually recognize than the core side thread rubber 23c.

Generally, the rubber thread of the waist part of a conventional pants-type disposable diaper is disposed between the skin side sheet and the non-skin side sheet like the back side waist part 30. However, in the conventional pants-type disposable diaper, the upper end portion of the waistline portion that does not overlap the absorbent main body in the vertical direction is easily visible as the elastic force of the rubber thread works strongly. When viewed from the non-skin side, there is a risk of giving an impression that the upper end of the waistline is excessively tightened. In particular, in the case of a body shape in which the abdomen protrudes forward, such as an infant, there is a problem that it is easy to give an impression that the abdomen is excessively tightened.

In this regard, the diaper 1 of the present embodiment is a soft diaper 1 in which the upper thread rubber 23u of the abdominal side upper part AU is less visible than the core side thread rubber 23c, so that the wearer's waistline is not excessively tightened. This makes it easier to give the impression of fitting. In addition, by having the core-side thread rubber 23c that is easier to visually recognize than the upper-side thread rubber 23u, the abdomen-side upper part AU gives an impression of softly fitting the wearer's abdomen, It becomes easy to give an impression that the contraction force of the core-side thread rubber 23c works more strongly. Even if it is the diaper 1 which fits a wearer's waist softly by this, 11 A of absorptive cores are made to fit a wearer's body strongly, and the impression that excretion leaks outside the diaper 1 is reduced. It becomes easy to give.

Since the middle thread rubber 23m is arranged in the ventral middle part AM, the absorbent main body 10 can be easily fitted to the wearer's abdomen by contraction of the middle thread rubber 23m. Furthermore, in the abdominal side intermediate part AM, by providing the middle thread rubber 23m of the upper side thread rubber 23u and the core side thread rubber 23c, it becomes easier to fit the absorbent main body 10 to the wearer's abdomen. Since the abdominal side intermediate part AM is the upper end part on the abdominal side of the absorbent main body 10, the excrement is absorbed into the absorbent main body 10 by bringing the upper end part on the abdominal side of the absorbent main body 10 closer to the wearer's skin. The risk of leaking from the upper end of the stomach side can be further reduced. Moreover, the upper end part by the side of the abdominal side of the absorptive main body 10 is made to closely_contact | adhere to a wearer's skin by providing the intermediate rubber 23m provided continuously from the one end part of the left-right direction of the abdominal side waist part 20 to the other end part. It becomes easy and it can be set as the state which made the absorptive main body 10 fit to a wearer's body.

Also, in the ventral upper side AU, it is preferable that the skin side sheet 21 and the non-skin side sheet part 22n are bonded by an adhesive part H20 such as hot melt. There is a possibility that the upper side AU of the ventral side is lowered so that the upper end of the ventral waist part 20 is wound by the contraction of the upper thread rubber 23u. In this regard, in the abdominal side upper part AU, the rigidity of the abdominal side upper part AU is improved by the rigidity of the adhesive part H20 by bonding the skin side sheet 21 and the non-skin side sheet part 22n using an adhesive. It is possible to reduce the risk of the upper end of the ventral waist part 20 turning up. Note that the bonding portion H20 is not necessarily limited to a bonding portion using an adhesive, and may be a bonding portion formed by, for example, heat welding or ultrasonic welding.

The ventral waist part 20 has a joint for joining the skin side sheet 21 and the non-skin side sheet 22, and in the diaper 1, is an adhesive part H 20. FIG. 17 is a view for explaining a joint portion of the ventral waist part 20 in FIG. In FIG. 17, the rubber thread 23 is omitted for convenience. As shown in FIG. 17, each of the plurality of bonding portions H20 has a shape along the vertical direction, and is intermittently arranged in the horizontal direction. An adhesive is continuously applied to the adhesive portion H20. Since the adhesive portion H20 made of an adhesive has a relatively high rigidity, the rigidity in the vertical direction of the abdominal side waistline portion 20, particularly the abdominal side upper portion AU, can be improved. By improving the rigidity of the ventral upper side AU, the risk of the upper end of the ventral waist part 20 being turned up can be further reduced. Also, as shown in FIG. 17, the length of the adhesive portion H20 in the left-right direction is adjacent by making the length of the adhesive portion H20 in the left-right direction shorter than the distance between two adjacent adhesive portions H20. The possibility that the abdomen upper portion AU becomes too hard due to the adhesive can be reduced as compared with the case where the distance is longer than the distance between the two adhesive portions H20. In addition, joining of the skin side sheet | seat 21 and the non-skin side sheet | seat 22 is not restricted to adhesion | attachment with an adhesive agent. For example, it may be performed by welding or fusion. Moreover, the joining part does not necessarily need to be continuous, and may be a plurality of welding parts or fusion parts arranged intermittently in the vertical direction.

Furthermore, the lower end of the folded portion 22u is located below the upper end of the absorbent main body 10. That is, the folding | returning part 22u is arrange | positioned not only to the ventral upper part AU but to the ventral intermediate part AM. As a result, the difference in rigidity at the upper end of the absorbent main body 10 caused by the upper end portion of the absorbent main body 10 having relatively high rigidity can be relaxed, so that the upper end of the absorbent main body 10 is bent. Fear can be reduced.

A value (F1 / H1) obtained by dividing the magnitude F1 of the force that extends the ventral upper side AU by the unit length in the left-right direction by the vertical length H1 of the ventral upper side AU is the ventral intermediate part AM. It is preferably smaller than the value (F2 / H2) obtained by dividing the size F2 to be extended by the unit length in the left-right direction by the length H2 in the vertical direction of the ventral intermediate portion AM (F1 / H1 <F2 / H2).

It should be noted that the force that extends in the left-right direction, that is, the “extension force” in the left-right direction is the “contraction force” in the left-right direction. Therefore, when the abdominal side upper part AU is extended with a predetermined force toward the outer side in the left-right direction, the abdominal side upper part AU tends to contract toward the inner side in the left-right direction. The force toward the inside in the left-right direction is the “contraction force”. For example, the extension force required to change the diaper 1 in the natural state into the diaper 1 in the extended state is equal to the contraction force that causes the diaper 1 in the extended state to return to the diaper 1 in the natural state. Hereinafter, the term “stretching force” may be used instead of “stretching force”.

That is, the contracting force acting in the left-right direction per unit length in the up-down direction in the ventral upper side AU is made smaller than the contracting force acting in the left-right direction per unit length in the up-down direction in the ventral intermediate part AM. Thereby, the abdominal side intermediate portion AM can be more strongly fitted to the skin of the wearer while the abdominal side upper portion AU is softly brought into contact with the wearer's skin. In the ventral middle part AM, the absorbent main body 10 is brought into contact with the wearer's skin more strongly to reduce the risk of excrement leaking, while in the ventral upper part AU, the wearer's skin is excessively reduced. By tightening, it is possible to reduce the risk of the rubber thread 23 being left on the skin of the wearer.

Further, a value (F3 / H3) obtained by dividing the magnitude F3 of the force that extends the ventral core side part AC by the unit length in the left-right direction by the vertical length H3 of the ventral core side part AC is FV. It is preferably smaller than the value (F2 / H2) obtained by dividing the size F2 for extending the intermediate portion AM by the unit length in the left-right direction by the vertical length H2 of the ventral intermediate portion AM (F3 / H3 <F2 /). H2). That is, the contraction force acting in the left-right direction per unit length in the up-down direction in the ventral core side part AC is made smaller than the contraction force acting in the left-right direction per unit length in the up-down direction in the ventral intermediate part AM. As a result, the ventral intermediate portion AM is stronger than the ventral core side portion AC and can fit the absorbent main body 10 to the wearer's skin, so that there is a greater risk of excrement leaking from the upper side of the absorbent main body 10. It can be reduced.

Furthermore, the value (F1 / H1) obtained by dividing the magnitude F1 of the force that extends the ventral upper side AU by the unit length in the left-right direction by the vertical length H1 of the ventral upper side AU is F1 side. More preferably (F1 / H1) smaller than the value (F3 / H3) obtained by dividing the magnitude F3 of the force for extending the part AC in the left-right direction by the unit length by the length H3 in the up-down direction of the ventral core side part AC. <F3 / H3). That is, the contraction force acting in the left-right direction per unit length in the up-down direction in the ventral upper side AU may be made smaller than the contraction force acting in the left-right direction per unit length in the up-down direction in the ventral core side part AC. More preferred. Accordingly, in the ventral upper side AU, the skin of the wearer is excessively tightened, and the risk of the rubber band 23 being left on the wearer's skin is reduced, while the ventral core side AC is Since the absorbent core 11A can be more strongly fitted to the wearer's skin, the risk of excrement leaking can be further reduced.

The magnitude F1 of extending the ventral upper side AU by the unit length in the left-right direction, the magnitude F2 of extending the ventral middle part AM by the unit length in the left-right direction, and the left-right direction of the ventral core side part AC An autograph type tensile tester (for example, AG-1KN1) manufactured by Shimadzu Corporation can be used to measure the contraction force of the magnitude F3 of the force that is extended by the unit length. First, the length (extension dimension) in the left-right direction between the inner sides in the left-right direction of the joint region 2 of the ventral waist part 20 of the stretched diaper 1 is measured in advance, and the left and right of the diaper 1 including the joint region 2 The joints on both sides in the direction are cut with a cutter, and the ventral upper side portion AU, ventral side intermediate portion AM, and ventral side core side portion AC are cut out from the ventral side waist portion 20 and used as samples.

When the ventral upper side AU, the ventral middle part AM, and the ventral core side AC are cut from the ventral waist part 20, they are cut out together with the absorbent main body 10 joined to the ventral waist part 20. That is, the sample of the ventral middle part AM is obtained by cutting out the absorbent main body 10 not including the absorbent core 11A together with the ventral waist part 20, and the sample of the ventral core side part AC is the ventral waist part. 20, the absorbent main body 10 including the absorbent core 11 A is cut out.

The magnitude of the force for extending each part (AU, AM, AC) in the left-right direction can be adjusted by the thickness of the thread rubber, the spring constant of the thread rubber, or the number of thread rubbers.

=== Modification ===
18 to 22 are schematic views for explaining a cross section of a modified example of the ventral waist part 20. In the above-described embodiment, the upper thread rubber 23u is disposed in the ventral upper part AU and the ventral intermediate part AM, the core thread rubber 23c is disposed in the ventral core side part AC and the ventral intermediate part AM, and the upper thread rubber. Although the folding | returning part 22u was provided in the skin side rather than 23u, it is not restricted to this.

For example, as shown in FIG. 18, the upper thread rubber 23u is disposed in the abdominal side upper part AU, and the upper thread rubber 23u is not disposed in the abdominal side intermediate part AM and the abdominal core side part AC. Alternatively, the core-side rubber thread 23c may be disposed in the ventral intermediate part AM, and the core-side rubber thread 23c may not be disposed in the ventral upper part AU. Even in such a case, in the diaper 1 in the pants-type state, the rubber thread 23 (23u) at the upper end of the abdomen waistline portion 20 is difficult to visually recognize, and the impression that the wearer's abdomen is softly abutted The impression that the absorbent main body 10 is more strongly fitted to the wearer's body by the rubber thread 23 (23c) provided at a position overlapping the absorbent main body 10 in the front-rear direction while giving excrement, and is difficult to leak. Can be given easily.

Further, as shown in FIG. 19, an upper sheet portion 22s made of a member different from the non-skin side sheet 22 may be provided on the skin side from the upper thread rubber 23u. Furthermore, the upper sheet portion 22s and the folded portion 22u are not necessarily disposed only in the region where the upper thread rubber 23u is disposed. The upper sheet portion 22s and the folded portion 22u only have to cover at least the upper thread rubber 23u from the skin side, and even when the upper thread rubber 23u is disposed in the ventral upper area AU as shown in FIG. The upper sheet portion 22s (folded portion u) may be provided across the ventral upper portion AU and the ventral intermediate portion AM. Similarly, when the upper rubber thread 23u is disposed in the ventral upper region AU, the upper sheet portion 22s (folded portion u) is placed on the ventral upper portion AU, ventral intermediate portion AM, and ventral core side portion AC. It may be provided over.

As shown in FIG. 20, the upper side rubber thread 23u may be arranged in the ventral upper part AU and the ventral middle part AM, and the core side rubber thread 23c may be provided in the ventral core side part AC. By doing in this way, in the diaper 1 in a pants-type state, a larger amount of the upper thread rubber 23u that is more difficult to visually recognize from the non-skin side is provided. It becomes easy to give an impression. Further, both the folded portion 22u and the upper sheet portion 22s may be provided.

As shown in FIG. 21, the upper thread rubber 23u may be disposed on the ventral upper side AU, the ventral intermediate part AM, and the ventral core side part AC. Since more thread rubber can be disposed between the skin-side sheet 21 and the non-skin-side sheet 22 as in the prior art, the absorbent main body 10, particularly the absorbent core 11A can be disposed. It can make it fit with a wearer's skin, and can reduce the possibility that excrement will leak.

As shown in FIG. 22, not only the non-skin side sheet 22 but also the skin side sheet 21 may have a folded portion. By setting it as such a structure, the rigidity of the upper end part of the abdominal side waist part 20 can be improved, and the possibility that the upper end part of the abdominal side waist part 20 may turn up can be reduced.

The embodiment of the present invention described above includes a pants-type absorbent article having the following modes, and the following problems are solved.

A pants-type disposable diaper is known as a pants-type absorbent article. For example, Patent Document 1 discloses a pants-type disposable diaper 1 having a ventral sheet member 2, a back sheet member 3, and an absorbent core 5. The belly side seat member 2 and the back side seat member 3 are each provided with an elastic member 7 that is extensible in the width direction, and the waist elastic member 7W is disposed above the upper end portion 5W of the absorbent core 5 and the diaper misalignment is dropped. Is preventing.

However, in Patent Document 1, the waist elastic member 7W of the pants-type disposable diaper 1 in a worn state is easily visible. Therefore, especially when an infant with a rounded abdomen wears, there is a risk that the waist elastic member 7W may easily give an impression that the waist of the wearer is excessively tightened.

The pant-type absorbent article of the following aspect is made in view of the conventional problems as described above, and the purpose thereof is a pant-type absorbent that easily gives an impression of being softly fitted around the waist of the wearer. In providing an article, the above-described embodiment of the present invention includes a pants-type absorbent article of the following aspect.

<Aspect 1>
Having a vertical direction, a horizontal direction, and a longitudinal direction;
It has an absorbent main body with an absorbent core and a pair of waist parts,
The waistline portion includes a skin side sheet portion, a non-skin side sheet portion, and a plurality of thread rubbers that can expand and contract in the left-right direction,
At least one waistline part of the pair of waistline parts has an upper part above the absorbent main body in the vertical direction, and a core side part that overlaps the absorbent core in the front-rear direction,
The plurality of thread rubbers is a pants-type absorbent article having an upper thread rubber disposed on the upper part and a core side rubber thread disposed on the core side part,
The upper part has an upper sheet part on the skin side from the skin side sheet part,
In the front-rear direction,
The upper thread rubber is disposed on the skin side from the skin side sheet portion, and on the non-skin side from the upper sheet portion,
The pants-type absorbent article, wherein the core-side rubber thread is arranged on the non-skin side from the skin-side sheet part and on the skin side from the non-skin-side sheet part.

According to the pant-type absorbent article of aspect 1, when the pant-type absorbent article is viewed from the non-skin side, the upper thread rubber of the waistline part is less visible than the core-side rubber thread, and the upper part is This makes it easier to give the impression that the waistline will fit softly.

<Aspect 2>
The pants-type absorbent article according to aspect 1, wherein the upper part includes a joint part that joins the skin-side sheet part and the non-skin-side sheet part.

According to the underpants-type absorbent article of aspect 2, the rigidity of the upper part can be further increased, so that the risk that the upper part is turned up and down due to the shrinkage of the rubber thread can be reduced.

<Aspect 3>
The waistline portion overlaps the absorbent main body in the front-rear direction, and has an intermediate portion above the absorbent core in the vertical direction,
The pants-type absorbent article according to

aspect

1 or 2, wherein the plurality of thread rubbers have intermediate thread rubbers arranged in the intermediate part.

According to the pant-type absorbent article of aspect 3, the intermediate thread rubber makes it easy to fit the intermediate portion to the wearer's body.

<Aspect 4>
The underpants-type absorbent article according to aspect 3, wherein the intermediate thread rubber is arranged on the skin side from the skin side sheet portion and on the non-skin side from the upper sheet portion.

According to such a pant-type absorbent article, when the pant-type absorbent article is viewed from the non-skin side, it is possible to make it difficult to visually recognize more of the rubber thread provided on the waistline portion. Since it can do, it becomes easy to give the impression that a waist part fits a wearer's waist softly.

<Aspect 5>
The underpants type absorbent article according to aspect 3, wherein the intermediate thread rubber is disposed on the non-skin side from the skin-side sheet part and on the skin side from the non-skin-side sheet part.

According to the underpants-type absorbent article of aspect 5, since it becomes easier to visually recognize the rubber thread of the waistline portion that overlaps the absorbent main body in the front-rear direction, the absorbent main body fits the body to the wearer, It becomes easy to give the impression that the excrement is difficult to leak.

<Aspect 6>
The intermediate thread rubber is
The skin side from the skin side sheet part, and the non-skin side from the upper sheet part,
The underpants type absorbent article according to any one of aspects 3 to 5, which is arranged on the non-skin side from the skin-side sheet part and on the skin side from the non-skin-side sheet part.

According to the underpants type absorbent article of aspect 6, the middle part is more worn by the rubber thread arranged on the skin side than the skin side sheet part and the rubber thread arranged on the non-skin side from the skin side sheet part. Therefore, the risk of excrement leaking from the upper side of the absorbent main body can be reduced.

<Aspect 7>
The value obtained by dividing the magnitude of the force for extending the upper part in the left-right direction by the unit length is the force for extending the intermediate part by the unit length in the left-right direction. The underpants type absorbent article according to any one of aspects 3 to 6, which is smaller than a value obtained by dividing the size of the intermediate part by the length in the vertical direction of the intermediate part.

According to the underpants-type absorbent article of aspect 7, the upper part is made to fit the wearer's skin while the upper part is softly brought into contact with the wearer's skin, so that the upper end part is made of rubber thread on the wearer's skin. The risk of excretion leaking from the absorbent main body can be reduced while preventing traces from being attached.

<Aspect 8>
A value obtained by dividing the magnitude of the force that extends the core side part by the unit length in the left-right direction is divided by the length of the core side part in the up-down direction, and the intermediate part is extended by the unit length in the left-right direction. The underpants type absorbent article according to any one of aspects 3 to 7, which is smaller than a value obtained by dividing the magnitude of the force to be divided by the vertical length of the intermediate portion.

According to the underpants type absorbent article of aspect 8, the possibility of excretion leaking from the upper side of the absorbent main body can be further reduced by fitting the middle part more firmly to the wearer's skin than the core side part. it can.

<Aspect 9>
A value obtained by dividing the magnitude of the force that extends the upper part by the unit length in the left-right direction divided by the vertical length of the upper part extends the core side part by the unit length in the left-right direction. The underpants type absorbent article according to any one of aspects 3 to 8, which is smaller than a value obtained by dividing the magnitude of the force by the length in the vertical direction of the core side portion.

According to the underpants-type absorbent article of aspect 9, the core side part is fitted to the wearer's skin while the upper part is softly brought into contact with the wearer's skin, so that the upper end part is thread rubber on the wearer's skin. It is possible to reduce the risk of excrement leaking from the absorbent core while preventing the traces from being attached.

<Aspect 10>
The upper sheet portion is a portion where the upper end portion of the non-skin side sheet portion is folded back to the skin side,
The underpants type absorbent article according to any one of aspects 1 to 9, wherein a lower end of the upper sheet portion is positioned below an upper end of the absorbent main body.

According to the underpants type absorbent article of aspect 10, since the difference in rigidity at the upper end of the absorbent main body can be reduced, the possibility of bending at the upper end of the absorbent main body can be reduced.

<Aspect 11>
The one waistline part has a joint part for joining the skin side sheet part and the non-skin side sheet part,
The joint portion has a shape along the vertical direction,
The underpants type absorbent article according to any one of aspects 1 to 10, wherein the plurality of joint portions are intermittently disposed in the left-right direction.

According to the underpants-type absorbent article of aspect 11, since the vertical rigidity of the waistline portion can be improved by the joint portion, the risk that the waistline portion will fold up and down due to the shrinkage of the rubber thread is reduced. Can do.

In addition, the above-described embodiment of the present invention includes a pants-type absorbent article having the following modes.
<Aspect 12>
Having a vertical direction, a horizontal direction, and a longitudinal direction;
It has an absorbent main body with an absorbent core and a pair of waist parts,
The waistline portion includes a skin side sheet portion, a non-skin side sheet portion, and a plurality of thread rubbers that can expand and contract in the left-right direction,
At least one waistline part of the pair of waistline parts has an upper part above the absorbent main body in the vertical direction, and a core side part that overlaps the absorbent core in the front-rear direction,
The plurality of thread rubbers is a pants-type absorbent article having an upper thread rubber disposed on the upper part and a core side rubber thread disposed on the core side part,
The upper part has an upper sheet part on the skin side from the skin side sheet part,
In the front-rear direction,
The upper thread rubber is disposed on the skin side from the skin side sheet portion, and on the non-skin side from the upper sheet portion,
The core side rubber thread is arranged on the non-skin side from the skin side sheet part, and on the skin side from the non-skin side sheet part,
The one waistline portion overlaps the absorbent main body in the front-rear direction, and has an intermediate portion above the absorbent core in the vertical direction,
The plurality of thread rubbers include an intermediate thread rubber disposed in the intermediate part,
The pants-type absorbent article, wherein the intermediate thread rubber is continuously provided from one end to the other end of the one waistline portion in the left-right direction.

According to the pant-type absorbent article of aspect 12, when the pant-type absorbent article is viewed from the non-skin side, the upper thread rubber at the waistline part is less visible than the core-side rubber thread, and the upper part is worn by the wearer. While making it easy to give an impression that the waistline is softly fitted, the intermediate thread rubber makes it easier to bring the intermediate part into close contact with the wearer's skin, so that the absorbent main body can be fitted to the wearer's body.

<Aspect 13>
The upper part has a joint part for joining the skin side sheet part and the non-skin side sheet part,
The pants-type absorbent article according to aspect 12, wherein the joint is along the vertical direction and is intermittently disposed in the horizontal direction.

According to the underpants-type absorbent article of aspect 13, since the vertical rigidity of the waistline portion can be improved by the joint portion, the risk that the waistline portion will fold up and down due to shrinkage of the rubber thread is reduced. Can do.

<Aspect 14>
The length of the said junction part in the said left-right direction is the underpants type absorbent article of aspect 13 shorter than the distance between the two said adjacent junction parts.

According to the underpants-type absorbent article of aspect 14, there is a risk that the upper portion becomes too hard due to the joint portion, compared to the case where the length of the joint portion in the left-right direction is longer than the distance between two adjacent joint portions. It can be reduced.

<Aspect 15>
The underpants type absorbent article according to any one of aspects 12 to 14, wherein the intermediate thread rubber is disposed on the skin side from the skin side sheet portion and on the non-skin side from the upper sheet portion.

According to the underpants type absorbent article of aspect 15, when the underpants type absorbent article is viewed from the non-skin side, it is difficult to visually recognize more of the rubber thread provided in the waistline portion. Since it can do, it becomes easy to give the impression that a waist part fits a wearer's waist softly.

<Aspect 16>
The underpants type absorbent article according to any one of aspects 12 to 14, wherein the intermediate thread rubber is arranged on the non-skin side from the skin-side sheet part and on the skin side from the non-skin-side sheet part.

According to the pants-type absorbent article of aspect 16, since it becomes easy to visually recognize the thread rubber of the waistline portion that overlaps the absorbent main body in the front-rear direction, the absorbent main body fits the body to the wearer, It becomes easy to give the impression that the excrement is difficult to leak.

<Aspect 17>
The intermediate thread rubber is
The skin side from the skin side sheet part, and the non-skin side from the upper sheet part,
The underpants type absorbent article according to any one of aspects 12 to 14, which is disposed on the non-skin side from the skin-side sheet part and on the skin side from the non-skin-side sheet part, respectively.

According to the underpants type absorbent article of aspect 17, the middle part is more worn by the rubber thread arranged on the skin side from the skin side sheet part and the rubber thread arranged on the non-skin side from the skin side sheet part. Therefore, the risk of excrement leaking from the upper side of the absorbent main body can be reduced.

<Aspect 18>
The intermediate thread rubber is
The skin side from the skin side sheet part, and the skin side from the upper sheet part and the non-skin side from the absorbent main body,
The underpants-type absorptivity according to any one of aspects 12 to 17, which are disposed on the non-skin side from the skin-side sheet part and on the non-skin side from the non-skin-side sheet part and the absorbent main body, respectively. Goods.

According to the underpants type absorbent article of aspect 18, the middle part is more worn by the rubber thread arranged on the skin side than the skin side sheet part and the rubber thread arranged on the non-skin side from the skin side sheet part. Therefore, the risk of excrement leaking from the upper side of the absorbent main body can be reduced.

<Aspect 19>
The value obtained by dividing the magnitude of the force for extending the upper part in the left-right direction by the unit length is the force for extending the intermediate part by the unit length in the left-right direction. The underpants-type absorbent article according to any one of aspects 12 to 18, which is smaller than a value obtained by dividing the size of the intermediate part by the length in the vertical direction of the intermediate part.

According to the underpants-type absorbent article of aspect 19, the upper portion is softly brought into contact with the wearer's skin, and the middle portion is fitted to the wearer's skin so that the upper end portion of the rubber thread is attached to the wearer's skin. The risk of excretion leaking from the absorbent main body can be reduced while preventing traces from being attached.

<Aspect 20>
A value obtained by dividing the magnitude of the force that extends the core side part by the unit length in the left-right direction is divided by the length of the core side part in the up-down direction, and the intermediate part is extended by the unit length in the left-right direction. The underpants-type absorbent article according to any one of aspects 12 to 19, which is smaller than a value obtained by dividing the magnitude of the force to be divided by the length in the vertical direction of the intermediate portion.

According to the underpants type absorbent article of aspect 20, the possibility of excrement leaking from the upper side of the absorbent main body can be further reduced by fitting the middle part more firmly to the wearer's skin than the core side part. it can.

<Aspect 21>
A value obtained by dividing the magnitude of the force that extends the upper part by the unit length in the left-right direction divided by the vertical length of the upper part extends the core side part by the unit length in the left-right direction. The underpants-type absorbent article according to any one of aspects 12 to 20, which is smaller than a value obtained by dividing the magnitude of force by the length in the vertical direction of the core side portion.

According to the underpants type absorbent article of aspect 21, the upper side portion is softly brought into contact with the wearer's skin, and the core side portion is fitted to the wearer's skin, so that the upper end portion is thread rubber on the wearer's skin. It is possible to reduce the risk of excrement leaking from the absorbent core while preventing the traces from being attached.

<Aspect 22>
The upper sheet portion is a portion where the upper end portion of the non-skin side sheet portion is folded back to the skin side,
The underpants type absorbent article according to any one of aspects 12 to 21, wherein a lower end of the upper sheet portion is positioned below an upper end of the absorbent main body.

According to the pants-type absorbent article of aspect 22, since the difference in rigidity at the upper end of the absorbent main body can be reduced, the possibility of bending at the upper end of the absorbent main body can be reduced.

<Aspect 23>
The one waistline part has a joint part for joining the skin side sheet part and the non-skin side sheet part,
The joint portion has a shape along the vertical direction,
The underpants type absorbent article according to any one of aspects 12 to 22, wherein the plurality of joint portions are intermittently disposed in the left-right direction.

According to the pants-type absorbent article of aspect 23, the vertical rigidity of the waistline portion can be improved by the joint portion, and therefore, the possibility that the waistline portion will fold up and down due to shrinkage of the rubber thread is reduced. Can do.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof.

In the above embodiment, as the pant-type absorbent article, the abdomen waistline 20 and the back waistline 30 are separated, and the so-called abdomen waistline 20, the back waistline 30, and the absorbent main body 10 have three members. Although the three-piece type diaper was illustrated, it is not limited to this. For example, the abdominal waistline 20 and the back waistline 30 are formed as one continuous member via the crotch, and the abdomen waistline 20 and the back waistline 30 are integrated with the exterior member. It may be a so-called two-piece type diaper having two members of the sex main body.

In the above-described embodiment, the rubber thread of the ventral waist part 20 includes the upper thread rubber 23u and the core thread rubber 23c, while the back waist part 30 has a skin side sheet 31 as in a conventional disposable diaper configuration. However, the present invention is not limited thereto. The back side waistline part 30 may be configured to include the upper side thread rubber and the core side thread rubber, or both the abdominal side waistline part 20 and the back side waistline part 30 may include the upper side thread rubber and the core side thread rubber. It may be.

1 diaper (pants-type absorbent article), 2 bonding area,
10 Absorbent body, 11 Absorber,
11A absorbent core, 11B core wrap sheet,
12 Top sheet, 13 Back sheet,
14 exterior sheet, 15 leg elastic member,
20 Ventral waistline (trunk),
21 skin side sheet (skin side sheet part), 22 non-skin side sheet (non-skin side sheet part),
22u folded portion, 22n non-skin side sheet portion, 22s upper sheet portion,
23 Rubber thread,
23u Skin side thread rubber (upper side rubber thread), 23c Non-skin side thread rubber (core side thread rubber),
23t Upper side rubber thread (upper thread rubber),
23m ventral intermediate thread rubber (intermediate thread rubber),
23d ventral core side rubber thread (core side rubber thread),
24 sheet member,
30 Dorsal waistline (trunk),
31 skin side sheet, 32 non-skin side sheet,
32u folded portion, 32n non-skin side sheet portion,
33 Rubber thread,
33t Back side upper side rubber thread, 33m Back side intermediate thread rubber, 33d Back side core side rubber thread,
34 sheet member,
AU ventral upper side (upper side),
AM ventral middle part (middle part),
AC ventral core side (core side),
BU upper back side,
BM back middle part,
BC back core side,
H10 bonding part,
H20 bonding part (joining part),
H24 adhesive part,
H34 bonding part

Claims

Having a vertical direction, a horizontal direction, and a longitudinal direction;
It has an absorbent main body with an absorbent core and a pair of waist parts,
The waistline portion includes a skin side sheet portion, a non-skin side sheet portion, and a plurality of thread rubbers that can expand and contract in the left-right direction,
At least the ventral waist part of the pair of waist parts has an upper part above the absorbent main body and a core side part overlapping the absorbent core in the front-rear direction in the vertical direction,
The plurality of thread rubbers include a plurality of upper thread rubbers intermittently disposed in the up and down direction on the upper part and a plurality of core side thread rubbers intermittently disposed in the up and down direction on the core side part. Mold absorbent article,
The average value of the pitch between the upper thread rubbers adjacent in the vertical direction in the upper part is smaller than the average value of the pitch between the core side rubbers adjacent in the vertical direction in the core side part,
A value obtained by dividing the magnitude of the force that extends the upper part by the unit length in the left-right direction divided by the vertical length of the upper part extends the core side part by the unit length in the left-right direction. A pant-type absorbent article having a force smaller than a value obtained by dividing the magnitude of the force by the length in the vertical direction of the core side portion.
Having a vertical direction, a horizontal direction, and a longitudinal direction;
It has an absorbent main body with an absorbent core and a pair of waist parts,
The waistline portion includes a skin side sheet portion, a non-skin side sheet portion, and a plurality of thread rubbers that can expand and contract in the left-right direction,
At least the ventral waist part of the pair of waist parts has an upper part above the absorbent main body and a core side part overlapping the absorbent core in the front-rear direction in the vertical direction,
The plurality of thread rubbers include a plurality of upper thread rubbers intermittently disposed in the up and down direction on the upper part and a plurality of core side thread rubbers intermittently disposed in the up and down direction on the core side part. Mold absorbent article,
The average value of the pitch between the upper thread rubbers adjacent in the vertical direction in the upper part is smaller than the average value of the pitch between the core side rubbers adjacent in the vertical direction in the core side part,
A pants-type absorbent article, wherein an average value of the diameters of the plurality of upper thread rubbers is smaller than an average value of the diameters of the core side thread rubbers.
The pant-type absorbent article according to claim 1 or 2,
The pants-type absorbent article, wherein the plurality of upper thread rubbers are continuously provided from one end to the other end of the ventral waist part in the left-right direction.
The pant-type absorbent article according to any one of claims 1 to 3,
A pant-type absorbent article, characterized in that a cut portion is not provided at an upper end portion of the abdominal side waistline portion in the vertical direction, which is a central portion of the abdominal side waistline portion in the left-right direction.
The pant-type absorbent article according to any one of claims 1 to 4,
The ventral waist part overlaps the absorbent main body in the front-rear direction, and has an intermediate part above the absorbent core in the vertical direction,
The pants-type absorbent article, wherein the plurality of thread rubbers have an intermediate thread rubber disposed in the intermediate part.
The pant-type absorbent article according to claim 5,
The value obtained by dividing the magnitude of the force for extending the upper part in the left-right direction by the unit length is the force for extending the intermediate part by the unit length in the left-right direction. A pants-type absorbent article, wherein the size is smaller than a value obtained by dividing the size of the intermediate portion by the length in the vertical direction of the intermediate portion.
The pant-type absorbent article according to claim 5 or 6,
A value obtained by dividing the magnitude of the force that extends the side portion of the core by the unit length in the left-right direction by the length in the up-down direction of the upper side portion extends the intermediate portion by the unit length in the left-right direction. A pant-type absorbent article, wherein the force is smaller than a value obtained by dividing the magnitude of the force by the length in the vertical direction of the intermediate portion.
The pant-type absorbent article according to any one of claims 1 to 7,
The upper end portion of the non-skin side sheet portion has an upper sheet portion folded back to the skin side,
A pants-type absorbent article, wherein a lower end of the upper sheet portion is located below an upper end of the absorbent main body.
The pant-type absorbent article according to any one of claims 1 to 8,
The upper part has an upper sheet part on the skin side from the skin side sheet part,
In the front-rear direction,
The upper thread rubber is disposed on the skin side from the skin side sheet portion, and on the non-skin side from the upper sheet portion,
The pants-type absorbent article, wherein the core-side rubber thread is arranged on the non-skin side from the skin-side sheet part and on the skin side from the non-skin-side sheet part.
The pant-type absorbent article according to claim 9,
The said upper part has a junction part which joins the said skin side sheet | seat part and the said non-skin side sheet | seat part, The pants type absorbent article characterized by the above-mentioned.
The pant-type absorbent article according to any one of claims 1 to 10,
The ventral waist part has a joint part for joining the skin side sheet part and the non-skin side sheet part,
The joint portion has a shape along the vertical direction,
A plurality of the joint portions are intermittently arranged in the left-right direction.
The pant-type absorbent article according to any one of claims 1 to 11,
The back waistline part of the pair of waistline parts has a backside upper part overlapping the upper part and a back core side part overlapping the core side part in the vertical direction,
The plurality of thread rubbers includes a plurality of back upper thread rubbers intermittently disposed in the vertical direction on the back side upper part and a plurality of backs intermittently disposed on the back core side part in the vertical direction. It has a side core side thread rubber,
A value obtained by dividing the magnitude of the force for extending the back side upper part by the unit length in the left-right direction by the vertical length of the back side upper part is the back core side part in the left-right direction. A pants-type absorbent article characterized by having a force larger than a value obtained by dividing the magnitude of the force to extend by a unit length by the length in the vertical direction of the back core side portion.
The pant-type absorbent article according to claim 12,
The average value of the pitch between the back-side upper thread rubbers adjacent in the up-down direction in the back-side upper part is the pitch of the back-side core-side thread rubbers adjacent in the vertical direction in the back-side core side part. A pants-type absorbent article characterized by being smaller than the average value.
The pant-type absorbent article according to any one of claims 1 to 13,
The back waistline part of the pair of waistline parts has a backside upper part overlapping the upper part and a back core side part overlapping the core side part in the vertical direction,
The plurality of thread rubbers includes a plurality of back upper thread rubbers intermittently disposed in the vertical direction on the back side upper part and a plurality of backs intermittently disposed on the back core side part in the vertical direction. It has a side core side thread rubber,
The average value of the pitches between the upper thread rubbers adjacent in the up-down direction in the upper part is equal to or less than the average value of the pitches of the back-side upper thread rubbers adjacent in the vertical direction in the back side upper part,
The size of the force for extending the upper part by the unit length in the left-right direction is less than the magnitude of the force for extending the back side upper part by the unit length in the left-right direction. Absorbent article.