WO2022145140A1

WO2022145140A1 - Underpants-type disposable diaper

Info

Publication number: WO2022145140A1
Application number: PCT/JP2021/041953
Authority: WO
Inventors: 俊文大坪
Original assignee: ユニ・チャーム株式会社
Priority date: 2020-12-28
Filing date: 2021-11-15
Publication date: 2022-07-07
Also published as: JP2022104326A; CN116634978A; JP7366881B2

Abstract

An underpants-type disposable diaper (1) has an absorbent body (10) equipped with an absorbent core (11), a ventral girth part (30), and a dorsal girth part (40), the ventral girth part (30) being provided with a ventral girth elastic member (35). The ventral girth part (30) has a ventral low-stretch region (61) which includes a section in which at least a portion of the ventral girth elastic member (35) is discontinuous in the left-right direction, thereby reducing the contraction force in comparison with other regions. In the left-right direction, the end on one side of the ventral low-stretch region (61) is located further toward the one side than the end on the one side of the absorbent core (11), and the end on another side of the ventral low-stretch region (61) is located further toward the other side than the end on the other side of the absorbent core (11). The ventral girth part (30) has a section where, when viewed in the thickness direction, the absorbent core (11) and the ventral low-stretch region (61) overlap one another.

Description

Pants-type disposable diapers

The present invention relates to a pants-type disposable diaper.

Conventionally, in pants-type disposable diapers, in order to prevent the diaper from slipping off from the wearer's body (girth) when worn, as many elastic members as possible around the waist such as rubber threads are arranged to strengthen the tightening around the waist. As a result, it was widely practiced to bring the diaper into close contact with the wearer's body. For example, Patent Document 1 discloses a pants-type absorbent article in which a plurality of waistline elastic members 52 are arranged in the circumferential direction on a waistline portion E located around the waistline.

Japanese Unexamined Patent Publication No. 2001-314441

In a pants-type diaper in which a plurality of elastic members around the waist are arranged as in Patent Document 1, the elastic core around the waist contracts in the left-right direction, so that the absorbent core (absorbent body) contracts in the left-right direction. When worn, it may appear that the absorbency and fit are deteriorated. In particular, on the ventral side (front side) of the wearer, the impression that the absorbent body is sluggish is likely to occur, which may give the user anxiety. In addition, if the elastic member around the waist is tightly tightened near the leg opening on the ventral side where the fat layer is thinner than on the dorsal side, rubber marks are likely to be left on the skin around the wearer's legs, which causes discomfort. May cause.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is a pants-type disposable diaper in which the absorbent core does not easily shrink on the ventral side and rubber marks do not easily adhere to the wearer's skin. Is to provide.

The main inventions for achieving the above object are an absorbent main body having a vertical direction, a horizontal direction and a front-back direction intersecting with each other and having a liquid-absorbing absorbent core, a ventral waistline portion, and a dorsal side. A pants-type disposable diaper having a waist circumference portion and provided with a plurality of ventral waist circumference elastic members that expand and contract in the left-right direction in the ventral waist circumference portion, wherein the ventral waist circumference portion is a plurality of the above-mentioned. At least a part of the ventral waist circumference elastic member has a ventral low expansion / contraction region in which the contraction force is reduced as compared with other regions by having a portion discontinuous in the left-right direction. One end of the ventral hypostretch region is located on one side of the one end of the absorbent core, and the other end of the ventral hypostretch region is on the other side of the absorbent core. It is located on the other side of the end and has a portion where the absorbent core and the ventral hypostretchable region overlap when the unfolded pants-type disposable diaper is viewed in the thickness direction. It is a pants-type disposable diaper that features.
Other features of the present invention will be clarified by the description in the present specification and the accompanying drawings.

According to the present invention, it is possible to provide a pants-type disposable diaper in which the absorbent core does not easily shrink on the ventral side and the wearer's skin does not easily have rubber marks.

It is a schematic perspective view of the diaper 1. It is a top view of the diaper 1 in the expanded and extended state. 2 is a schematic cross-sectional view taken along the line AA of FIG. 2 is a schematic cross-sectional view taken along the line BB of FIG. 2. It is a figure explaining the arrangement of the symbol part 90. 6A and 6B are a plan view and a cross-sectional view showing a modified example of the diaper 1.

The description of this specification and the accompanying drawings will clarify at least the following matters.
It has an absorbent body having a vertical direction, a horizontal direction, and a front-back direction intersecting with each other and having a liquid-absorbing absorbent core, a ventral waist circumference portion, and a dorsal waist circumference portion, and has the ventral side. A pants-type disposable diaper provided with a plurality of ventral waist elastic members that expand and contract in the left-right direction in the waist circumference portion, and the ventral waist circumference portion has at least a part of the ventral waist circumference elastic members. It has a ventral hypostretchable region in which the contractile force is reduced more than the other regions by having a portion that is discontinuous in the left-right direction, and in the left-right direction, one end of the ventral hypostretchable region is , Located on one side of one end of the absorbent core, the other end of the ventral hypostretchable region is located on the other side of the other end of the absorbent core and is in a deployed state. The pants-type disposable diaper is characterized in that, when the pants-type disposable diaper is viewed in the thickness direction, the absorbent core and the ventral hypostretchable region have an overlapping portion.

According to such a pants-type disposable diaper, in the ventral waist circumference portion, the contractile force of the waist circumference elastic member is less likely to act on the absorbent core, and the absorbent core is less likely to contract when the diaper is worn. As a result, deterioration of absorption performance and fit is suppressed. In addition, since the absorbent core does not easily contract on the ventral side, which is easily visible when the diaper is worn, it is possible to prevent the user from feeling anxious. Since the contractile force of the waistline elastic member does not act on the lateral side of the absorbent core, it becomes difficult for the waistline elastic member to be pressed against the wearer's skin near the ventral leg opening, and rubber marks are left on the skin. Can be suppressed.

In such a pants-type disposable diaper, the dorsal waist circumference portion is provided with a plurality of dorsal waist circumference elastic members that expand and contract in the left-right direction, and the dorsal waist circumference portion is a plurality of the dorsal waist circumference elastic members. Has a dorsal low stretch region in which the contractile force is reduced as compared with other regions by having a portion discontinuous in the left-right direction, and the dorsal low stretch region in the left-right direction. It is desirable that the width is narrower than the width of the ventral low expansion / contraction region in the left-right direction.

According to such a pants-type disposable diaper, the contraction force acting on the dorsal waist circumference is large, so even if the contraction force acting on the ventral waist circumference is reduced, the ventral waist circumference and the dorsal waist circumference as a whole , A contraction force of appropriate strength will act in the circumferential direction. In addition, the dorsal waistline contracts in the left-right direction, so that the ventral waistline is pulled to both sides in the left-right direction, and the seat member constituting the ventral waistline is in close contact with the wearer's skin. However, the ventral waistline is less likely to slip off.

In such a pants-type disposable diaper, it is desirable that the width of the dorsal low expansion / contraction region in the left-right direction is narrower than the width of the absorbent core in the left-right direction.

According to such a pants-type disposable diaper, the width of the low stretch area on the dorsal side is made smaller than the width of the absorbent core, so that the stretchable area on the dorsal side becomes relatively wide. The contraction force of the elastic member becomes large, and it becomes easy to secure an appropriate contraction force for the waist circumference member as a whole. Further, on the dorsal side, since the contractile force due to the elastic member around the waist acts on the absorbent core, the absorbent core can be easily fitted to the wearer's body and leakage of stool or the like can be suppressed.

In such a pants-type disposable diaper, the absorbent main body has a pair of leak-proof wall portions on both sides in the left-right direction, and one end of the ventral low expansion / contraction region in the left-right direction is , The other end of the ventral low expansion / contraction region is located on one side of the standing starting point on one side of the leak-proof wall portion, and the other end of the ventral low expansion / contraction region is located on the other side of the standing starting point on the other side of the leak-proof wall portion. is doing,
Is desirable.

According to such a pants-type disposable diaper, when worn, the contraction force due to the elastic member around the waist does not easily act on the leak-proof wall portion, and the leak-proof wall portion does not bend or distort and keeps an upright state. It will be easier. As a result, it is difficult for the wearer to feel uncomfortable, and it is possible to suppress lateral leakage of excrement.

In such a pants-type disposable diaper, in the left-right direction, one end of the ventral hypostretchable region is located on one side of the one-sided end of the absorbent body, and the ventral hypostretchable region is located. It is desirable that the other end of the absorbent body is located on the other side of the other side of the absorbent body.

According to such a pants-type disposable diaper, it is difficult for the elastic member around the waist to act on both ends and the outer region of the absorbent body in the left-right direction, so that it is difficult for rubber marks to be left near the wearer's legs. Become.

The pants-type disposable diaper has a pair of side joints that annularly connect the ventral waistline portion and the dorsal waistline portion at both ends in the left-right direction, and the left and right sides of the absorbent body. In the region between the lateral end in the direction and the lateral junction with the side junction, the width of the ventral hypostretchable region in the lateral direction is adjacent to the laterally lateral side of the ventral hypostretchable region. It is desirable that it is narrower than the width of the area.

According to such a pants-type disposable diaper, since the ventral elastic region is larger than the ventral low elastic region in both outer regions of the absorbent body, the contraction force of the waistline elastic member is likely to act. As a result, it is possible to prevent the fit of the ventral waist circumference from deteriorating on the ventral side of the wearer as compared with the case where the ventral elastic region is narrower than the ventral low elastic region. ..

The pants-type disposable diaper has a pair of side joints that annularly connect the ventral waistline portion and the dorsal waistline portion at both ends in the left-right direction, and the left and right sides of the absorbent body. In the region between the lateral end in the direction and the lateral junction with the side junction, the width of the ventral hypostretchable region in the lateral direction is adjacent to the laterally lateral side of the ventral hypostretchable region. It is desirable that it is wider than the width of the area.

According to such a pants-type disposable diaper, the contractile force acting on the ventral waist circumference can be reduced as compared with the case where the ventral elastic region is wider than the ventral low elastic region, and thus absorption is possible. The sex body can be made more difficult to contract. In addition, since the range in which the contractile force due to the elastic member around the waist is difficult to act is widened on both sides of the absorbent body in the left-right direction, it is possible to make it difficult for rubber marks to be left on the skin near the legs on the ventral side of the wearer. ..

In such a pants-type disposable diaper, the length of the portion provided with the ventral low-stretch region in the ventral waist circumference is the length of the portion not provided with the ventral low-stretch region. It is desirable that it is longer than the length in the vertical direction.

According to such a pants-type disposable diaper, the lateral contraction force of the elastic member around the waist is weakened in a wide range in the vertical direction of the ventral waist circumference, the absorbent core is less likely to contract, and the wearer's body. It becomes difficult for rubber marks to be left on the skin.

In such a pants-type disposable diaper, the length of the portion provided with the ventral low-stretch region in the ventral waist circumference is the length of the portion not provided with the ventral low-stretch region. It is desirable that the length is equal to or less than the length in the vertical direction.

According to such a pants-type disposable diaper, the contraction force of the waistline elastic member acting on the ventral waistline can be increased as compared with the case where the low stretch area is larger than the stretchable area. As a result, it is possible to suppress misalignment and deterioration of fit when wearing the diaper.

In such a pants-type disposable diaper, elastic members are continuously arranged on the ventral waist circumference portion and the upper end portions of the dorsal waist circumference portion from one end to the other end in the left-right direction. It is desirable that it is done.

According to such a pants-type disposable diaper, the waist circumference elastic members are continuously arranged along the circumferential direction at the upper ends of the ventral waist circumference portion and the dorsal waist circumference portion forming the waist circumference opening. The fit of the opening can be improved.

In such a pants-type disposable diaper, a plurality of dorsal waist elastic members that expand and contract in the left-right direction are provided on the dorsal waist circumference portion, and the average of the ventral waist circumference elastic members in the ventral waist circumference portion. It is desirable that the stress is smaller than the average stress of the dorsal girth elastic member in the dorsal girth portion.

According to such a pants-type disposable diaper, by arranging the elastic member around the waist so that the stress at the ventral waist is weakened, it is possible to prevent rubber marks from being left on the skin on the wearer's ventral side. .. In addition, by arranging the elastic member around the waist so that the stress in the back waist is strong, the contraction force on the dorsal side is strengthened due to the weak contraction force on the ventral side, and the waist circumference on the back and belly is increased when the diaper is worn. It becomes easier to prevent the wearer from slipping off the body (girth area).

In such a pants-type disposable diaper, the range in which the ventral low elasticity region is provided in the vertical direction of the ventral waist circumference is defined as F1, and the range in which the ventral low elasticity region is not provided is F2. In the vertical direction of the dorsal girth portion, the average stress of the dorsal girth elastic member in the range corresponding to F1 is the stress of the dorsal girth elastic member in the range R2 corresponding to F2. It is desirable that it is greater than the average stress.

According to such a pants-type disposable diaper, by increasing the stress in the region (R1) of the dorsal waist circumference corresponding to the region F1 of the ventral waist circumference, the region (R1) causes the region of the ventral waist circumference portion. F1 is easily pulled in the left-right direction, and it is possible to suppress a decrease in contraction force as a whole. This makes it possible to prevent the ventral waist circumference and the dorsal waist circumference from slipping off the wearer's body when worn.

In such a pants-type disposable diaper, the average stress of the dorsal waist elastic member in the upper half of the range corresponding to F1 in the vertical direction of the dorsal waist corresponds to F1. It is desirable that the stress is larger than the average stress of the dorsal waistline elastic member in the lower half of the range.

According to such a pants-type disposable diaper, of the area of the dorsal waist circumference (R1) corresponding to the region F1 of the ventral waist circumference, the lower region (R1d) in the vertical direction is one of the leg circumference openings. Since it is a part that forms a portion, by making the stress in the lower region (R1d) weaker than the stress in the upper region (R1u), an excessive tightening force acts on the wearer's leg circumference. Can be difficult and less likely to cause discomfort

In such a pants-type disposable diaper, among the ventral waist circumference elastic members continuously arranged from one end to the other end in the left-right direction in the ventral waist circumference portion, the upper and lower parts thereof. It is desirable that the ventral waist circumference elastic member located at the lowermost position in the direction is located below the ventral upper end of the absorbent core in the vertical direction.

According to such a pants-type disposable diaper, the upper end portion of the absorbent core is worn by the wearer due to the contraction force of the elastic member arranged at the lower end portion of the continuous elastic members continuous from one end to the other end in the left-right direction. It is pressed against the body of the diaper, making it difficult to create a gap between the upper end of the absorbent core and the wearer's skin. Therefore, it is possible to prevent excrement such as urine from leaking to the outside (upper side) of the absorbent core from the gap.

In such a pants-type disposable diaper, among the ventral waist circumference elastic members continuously arranged from one end to the other end in the left-right direction in the ventral waist circumference portion, the upper and lower parts thereof. It is desirable that the ventral waist circumference elastic member located at the lowermost side in the direction is located above the ventral upper end of the absorbent core in the vertical direction.

According to such a pants-type disposable diaper, since the absorbent core does not overlap with any of the elastic members around the waist, the contractile force of the elastic member around the waist does not act on the absorbent core. Therefore, it is possible to more easily suppress the absorption core from contracting in the left-right direction.

Such a pants-type disposable diaper has a design portion that overlaps with at least a part of the ventral waist circumference portion when viewed in the thickness direction, and the width of the design portion in the left-right direction is the belly. It is desirable that the width of the side low expansion / contraction region is narrower than the width in the left-right direction.

According to such a pants-type disposable diaper, in the ventral low expansion / contraction region, the waistline member does not easily contract in the left-right direction, so that the design portion provided in the region inside the ventral low expansion / contraction region also moves in the left-right direction. It becomes difficult to contract. Therefore, when the user sees the diaper from the front side (ventral side), the design can be easily visually recognized.

=== Embodiment ===
As the pants-type absorbent article according to the present invention, a pants-type disposable diaper (hereinafter, also referred to as “diaper 1”) will be described as an example. However, the pants-type diaper according to the present invention can also be applied to pants-type absorbent articles other than diapers, such as pants-type napkins and other pants-type absorbent articles.

<Composition of diaper 1>
FIG. 1 is a schematic perspective view of the diaper 1. FIG. 2 is a plan view of the unfolded and stretched diaper 1. FIG. 3 is a schematic cross-sectional view taken along the line AA of FIG. FIG. 4 is a schematic cross-sectional view taken along the line BB of FIG. The "stretched state" of the diaper 1 is a state in which the entire diaper 1 (the entire product) is stretched without wrinkles. It refers to a state in which the dimensions of the waist member (20, etc.) are extended until they match or are close to the dimensions of the individual member.

In the pants-shaped state shown in FIG. 1, the diaper 1 has a vertical direction, a horizontal direction, and a front-rear direction that intersect each other, and has a waist circumference opening BH and a pair of leg circumference openings LH and LH.
The upper side in the vertical direction corresponds to the waist opening side, and the lower side corresponds to the inseam side. In addition, the front side in the anteroposterior direction corresponds to the ventral side of the wearer, and the rear side corresponds to the dorsal side of the wearer. Further, in the unfolded state of FIG. 2, the diaper 1 has a vertical direction and a horizontal direction that intersect each other. The vertical direction is a direction along the vertical direction in FIG. 1, and corresponds to the longitudinal direction of the absorbent body 10. The lateral direction is a direction along the left-right direction in FIG. Further, as shown in FIG. 3, the direction in which the materials constituting the diaper 1 are laminated is defined as the thickness direction. The side in contact with the wearer's skin in the thickness direction is the skin side, and the opposite side is the non-skin side.

The diaper 1 has a liquid-absorbing absorbent body 10 and a waistline member 20 arranged on the non-skin side of the absorbent body 10. The waistline member 20 has a ventral waistline portion 30 corresponding to the front body of the diaper 1 and a dorsal waistline portion 40 corresponding to the back body of the diaper 1. That is, the diaper 1 of the present embodiment has an absorbent main body 10 which is applied to the crotch portion of the wearer and absorbs excrement such as urine as the first part, and the ventral side of the wearer as the second part. It is a so-called three-piece type diaper having a ventral waist circumference portion 30 covering the portion and having a dorsal waist circumference portion 40 covering the back side portion of the wearer as a third component. However, the diaper 1 is not limited to the 3-piece type, and may be a 2-piece type pants-type diaper having a waistline member 20 in which the front body and the back body are integrally formed and an absorbent main body 10.

In the unfolded state of FIG. 2, the ventral waist circumference portion 30 and the dorsal waist circumference portion 40 are arranged in parallel with a vertical distance from each other, and the absorbent main body 10 is hung between them. The end portions 10ea and 10eb in the longitudinal direction (longitudinal direction) of the absorbent main body 10 are joined and fixed to the skin side of the nearest

waist circumference portions

30 and 40, respectively, and the external shape thereof is substantially H-shaped in a plan view. .. Then, from this state, the absorbent main body 10 is folded in half with the center position CL in the longitudinal direction as the folding position. In this folded state, the ventral waist circumference portion 30 and the dorsal waist circumference portion 40 facing each other are joined and connected to each other at the side portions 30sw and the side portions 40sw on both sides in the left-right direction, and the pair of

side joining portions

50, 50. Is formed. That is, the ventral waist circumference portion 30 and the dorsal waist circumference portion 40 are formed in an annular shape by the pair of side

joint portions

50, 50. As a result, the diaper 1 is in a pants-type state in which the waist opening BH and the pair of leg openings LH and LH are formed as shown in FIG. The side joining portion 50 is formed by known joining means such as welding and adhesion.

(Absorbable body 10)
As shown in FIGS. 3 and 4, the absorbent main body 10 has an absorbent core 11 that absorbs excrement, a top sheet 12 that is arranged on the skin side in the thickness direction of the absorbent core 11, and absorbs the excrement. It has a back sheet 13 arranged on the non-skin side of the sex core 11. However, the absorbent main body 10 may include a seat member other than this. For example, a second sheet (not shown) may be provided between the top sheet 12 and the absorbent core 11 in the thickness direction.

The absorbent core 11 is a member that absorbs and retains excrement such as urine, and is formed of, for example, a liquid absorbent fiber such as a pulp fiber mixed with a highly absorbent polymer (SAP). The outer peripheral surface of the absorbent core 11 may be covered with a liquid-permeable sheet member such as tissue paper or a non-woven fabric (for example, the core wrap sheet 11b in FIG. 4).

The top sheet 12 is a liquid permeable sheet, and for example, a hydrophilic air-through non-woven fabric, a spunbonded non-woven fabric, or the like is used. The back sheet 13 has a two-layer structure of a liquid-impermeable sheet 13a and a hydrophobic exterior sheet 13b arranged on the non-skin side thereof. As the liquid impermeable sheet 13a, for example, a resin film or the like is used, and as the exterior sheet 13b, for example, a flexible non-woven fabric or the like is used.

A pair of leak-proof wall portions 15 are provided on both left and right sides of the absorbent main body 10 along the vertical direction (longitudinal direction of the absorbent main body 10). In the present embodiment, the leak-proof wall portion 15 is formed by the exterior sheet 13b described above. Specifically, in the left-right direction (horizontal direction), while a part of the exterior sheet 13b extends outward from both ends 11es and 11es of the absorbent core 11, the outer ends 15es and 15es are bent at positions as shown in FIG. It can be folded toward the skin. Then, the pair of leak-proof wall portions 15 are formed by being further bent at a plurality of places on the skin side of the absorbent core 11. A leak-proof wall elastic member 16 such as a rubber thread is attached to the skin-side end (tip portion) of the leak-proof wall portion 15 in a state of being extended along the vertical direction (longitudinal direction of the absorbent body 10). .. When the diaper 1 is worn, the leak-proof wall portion 15 stands up on the wearer's skin side with the outer ends 15es and 15es as the starting points based on the elasticity developed by the leak-proof wall elastic member 16, and the crotch of the wearer. Fits the part.

Further, on both left and right sides of the absorbent main body 10, leg elastic members 17 such as rubber threads are attached in a state of being extended along the vertical direction (longitudinal direction of the absorbent main body 10). When the diaper 1 is worn, both side portions of the absorbent main body 10 contract due to the elasticity developed by the leg circumference elastic member 17, and it becomes easy to fit along the leg circumference of the wearer.

(Abdominal waist circumference 30)
As shown in FIG. 3, the ventral waist circumference portion 30 is a skin-side sheet 31 arranged on the skin side in the thickness direction and a non-skin side laminated so as to be adjacent to the non-skin side of the skin-side sheet 31. It has a sheet 32 and a ventral waist elastic member 35 (hereinafter, also simply referred to as “girth elastic member 35”) provided between the skin side sheet 31 and the non-skin side sheet 32 in the thickness direction. The ventral waist circumference portion 30 basically has a two-layer structure of a skin-side sheet 31 and a non-skin-side sheet 32, but has a partially three-layer or more structure such as a skin surface sheet 36 described later. It's okay to have it. The skin-side sheet 31 and the non-skin-side sheet 32 are rectangular sheet members in a plan view as shown in FIG. 2, and are formed of, for example, SMS non-woven fabric.

In the ventral waist circumference portion 30 of the present embodiment, the upper end portion (front end portion in the vertical direction) of the non-skin side sheet 32 is folded back from the non-skin side to the skin side and from the upper side to the lower side in the vertical direction. It has 32f. By covering a part (upper end portion) of the skin side sheet 31 with the folded portion 32f, it is possible to prevent the upper end edge of the skin side sheet 31 from biting into the wearer's skin. However, the folded-back portion 32f does not necessarily have to be provided.

A plurality of waistline elastic members 35 are arranged side by side in the vertical direction between the skin side sheet 31 and the non-skin side sheet 32, and are attached in a state of being extended in the left-right direction. Due to the elasticity developed by the waistline elastic member 35, the ventral waistline portion 30 fits the wearer's ventral waistline.

The waistline elastic member 35 can be attached using an adhesive such as a hot melt adhesive. For example, the waistline elastic member 35 can be attached by applying a hot melt adhesive to the waistline elastic member 35, stretching it at a predetermined elongation ratio, and sandwiching it between the skin side sheet 31 and the non-skin side sheet 32. That is, the skin-side sheet 31 and the non-skin-side sheet 32 are joined by an adhesive via the waistline elastic member 35. Further, the waistline elastic member 35 may be attached by applying an adhesive to the skin side sheet 31 and the non-skin side sheet 32 side.

Further, the ventral waist circumference portion 30 may have a skin surface sheet 36. As shown in FIG. 3, the skin surface sheet 36 is a sheet member arranged so as to cover the upper end 10ea (front end portion in the vertical direction) of the absorbent main body 10 from the skin side, and functions as a cover sheet. Have. This prevents the upper end edge of the absorbent body 10 from biting into the wearer's skin when the diaper 1 is worn. The skin surface sheet 36 is formed of, for example, an SMS non-woven fabric or the like. However, the skin surface sheet 36 does not necessarily have to be provided.

(Dorsal waist circumference 40)
The dorsal waist circumference portion 40 has substantially the same configuration as the ventral waist circumference portion 30. That is, the dorsal waist circumference portion 40 includes a skin-side sheet 41 arranged on the skin side in the thickness direction, a non-skin-side sheet 42 laminated so as to be adjacent to the non-skin-side of the skin-side sheet 41, and a skin-side sheet. It has a dorsal waist circumference elastic member 45 (hereinafter, also simply referred to as “girth circumference elastic member 45”) provided between the sheet 41 and the non-skin side sheet 42 in the thickness direction. The configuration of each member is substantially the same as that of the ventral waist circumference portion 30.

On the other hand, the external shape of the dorsal waist circumference 40 is different from that of the ventral waist circumference 30. Specifically, as shown in FIG. 2, the dorsal waist circumference portion 40 has a buttock cover 40b having a substantially trapezoidal shape on the lower side in the vertical direction with respect to the side joint portion 50 (side portion 40sw). The buttock cover 40b has a wider width from the lower side to the upper side in the vertical direction, and the buttock cover 40b is provided so that the dorsal waist circumference portion 40 covers the buttock portion of the wearer when the diaper 1 is worn. It is possible to do.

<Arrangement of waist

elastic members

35 and 45>
Subsequently, the details of the arrangement of the waistline elastic member 35 provided on the ventral waistline portion 30 and the waistline elastic member 45 provided on the dorsal waistline portion 40 will be described. As described above, the waistline

elastic members

35 and 45 are attached in a state of being extended in the left-right direction, thereby imparting elasticity in the left-right direction to the

waistline portions

30 and 40.

By the way, when the

elastic members

35 and 45 exert a contraction force in all the regions of the

waist circumference portions

30 and 40, the tightening of the

waist circumference portions

30 and 40 tends to be strong as a whole, which may cause discomfort to the wearer. There is a risk that the wearer's skin will have linear marks due to the

elastic members

35 and 45 around the waist. Further, as the waistline

elastic members

35 and 45 contract in the left-right direction, the absorbent core 11 (absorbent main body 10) contracts in the left-right direction, and the area where excrement can be absorbed becomes narrower to absorb the excrement. Function may be impaired. Further, when the absorbent core 11 is contracted on the front side (ventral side) of the diaper 1, it is easily visible to the wearer or the caregiver, giving the impression that the absorbability and fit of the diaper 1 are deteriorated. Easy to make.

Therefore, in the diaper 1 of the present embodiment, the absorbent core 11 contracts in the left-right direction by providing a region in the

waist circumference portions

30 and 40 where the contraction force of the waist circumference

elastic members

35 and 45 is difficult to act. In addition, it suppresses the formation of rubber marks on the wearer's skin.

In the diaper 1, the waistline elastic member 35 provided in the ventral waistline portion 30 is a continuous elastic member 35s that is continuous from one end in the left-right direction to the other end, and at least a part thereof is discontinuous in the left-right direction. It has a discontinuous elastic member 35c which has become. In FIG. 2, a plurality of continuous

elastic members

35s, 35s ... Are arranged in the upper region of the ventral waist circumference portion 30 in the vertical direction, and a plurality of continuous

elastic members

35s, 35s ... The discontinuous

elastic members

35c, 35c ... Are arranged.

The discontinuous elastic member 35c has a discontinuous portion 61 shown by a shaded portion in FIG. 2 in the central portion in the left-right direction, and the contraction force due to the waistline elastic member 35 is weakened in the discontinuous portion 61. Or the contraction force is not acting. That is, in the ventral waist circumference portion 30, the region where the discontinuous portion 61 is formed is a low expansion / contraction region in which the contraction force due to the waist circumference elastic member 35 is reduced as compared with other regions. Hereinafter, the discontinuous portion 61 is also referred to as a ventral low expansion / contraction region 61.

The ventral low expansion / contraction region 61 is formed, for example, as follows. First, in the manufacturing process of the ventral waist circumference portion 30, the waist circumference elastic member 35 in a state of being extended in the left-right direction is adhered to the skin side sheet 31 and the non-skin side sheet 32 constituting the ventral waist circumference portion 30. At this time, in the region forming the discontinuous portion 61, the waistline elastic member 35 is not adhered to the skin side sheet 31 and the non-skin side sheet 32. Next, the waistline elastic member 35 arranged in the region overlapping the discontinuous portion 61 is cut near the center position in the left-right direction. Then, the cut waistline elastic member 35 contracts from the cut portion toward both outer sides in the left-right direction, and contracts at both ends in the left-right direction of the discontinuous portion 61 (the position where the waistline elastic member 35 is adhered). To stop. As a result, a part of the waistline elastic member 35 (discontinuous elastic member 35c) becomes discontinuous in the left-right direction, and a ventral low expansion / contraction region 61 is formed in the discontinuous portion. The operation of forming a discontinuous portion by contracting a part of the waistline elastic member 35 in this way is also referred to as “cutback”.

The ventral low expansion / contraction region 61 may be formed by a method other than cutback. For example, an adhesive is applied to the entire ventral waist circumference portion 30 to attach the waist circumference elastic member 35, and the waist circumference elastic member 35 is shredded at a plurality of places in a predetermined region (region forming the discontinuous portion 61). By making it discontinuous, a discontinuous portion 61 (ventral low elastic region 61) on which elastic force does not act may be formed.

Further, in the ventral waist circumference portion 30, the region other than the ventral low stretch region 61 is referred to as the ventral stretch region 71. The ventral stretchable region 71 is a region in which the lateral contraction force of the continuous elastic member 35s or the discontinuous elastic member 35c acts stronger than the ventral low stretchable region 61.

The diaper 1 of the present embodiment has a portion where the ventral hypostretchable region 61 and the absorbent core 11 overlap when viewed in the thickness direction (see FIG. 2). Further, the width W61 in the left-right direction of the ventral low expansion / contraction region 61 is wider than the width W11 in the left-right direction of the absorbent core 11 (W61> W11). In other words, in the left-right direction, the one-sided end 61es1 of the ventral hypostretchable region 61 is located on one side of the one-sided end 11es1 of the absorbent core 11 and the other end of the ventral hypostretchable region 61. 61es2 is located on the other side of the other end 11es2 of the absorbent core 11.

Therefore, in the ventral waist circumference portion 30, it is difficult for the contraction force of the waist circumference elastic member 35 to act on the absorbent core 11. This makes it difficult for the absorbent core 11 to contract in the left-right direction when the diaper 1 is worn, and it is possible to prevent the absorbent core 11 from deteriorating its absorption performance and fit. In addition, since the absorbent core 11 is less likely to contract on the ventral side, which is easily visible when the diaper 1 is worn, it is possible to make it less likely to cause anxiety to the user. Then, since the contractile force due to the waist elastic member 35 does not act in the region outside the absorbent core 11 in the left-right direction, when the diaper 1 is worn, the wearer wears the diaper 1 in the vicinity of the ventral leg opening where the fat layer is thin. It becomes difficult for the elastic member 35 around the waist to be pressed against the skin, and it is possible to prevent rubber marks from being left on the skin.

Further, similarly to the ventral waist circumference portion 30, the dorsal waist circumference elastic member 45 provided in the dorsal waist circumference portion 40 is a continuous elastic member 45s continuous from one end to the other end in the left-right direction. It has a discontinuous elastic member 45c whose at least a part is discontinuous in the left-right direction.

The discontinuous elastic member 45c has a discontinuous portion 62 shown by a shaded portion in FIG. 2 in the central portion in the left-right direction, and the contraction force due to the waistline elastic member 45 is weakened in the discontinuous portion 62. Or the contraction force is not acting. That is, the region of the dorsal waist circumference portion 40 in which the discontinuous portion 62 is formed is a low expansion / contraction region in which the contraction force of the waist circumference elastic member 45 is reduced as compared with other regions. Hereinafter, the discontinuous portion 62 is also referred to as a dorsal low expansion / contraction region 62. Further, in the dorsal waist circumference portion 40, the region other than the dorsal low expansion / contraction region 62 is referred to as the dorsal expansion / contraction region 72.

Then, in the diaper 1 of the present embodiment, as shown in FIG. 2, the width W62 in the left-right direction of the dorsal low-stretch region 62 is narrower than the width W61 in the left-right direction of the ventral low-stretch region 61. (W61> W62). Therefore, the contraction force of the waistline elastic member 45 acting on the dorsal waistline portion 40 of the diaper 1 is larger than the contraction force of the waistline elastic member 35 acting on the ventral waistline portion 30. As described above, in the ventral waist circumference portion 30 of the diaper 1, the contraction force of the waist circumference elastic member 35 is weakened as a whole by widening the ventral low expansion / contraction region 61. However, in this case, when the diaper 1 is worn, the ventral waist circumference portion 30 tends to slip off from the wearer's body, and the fit of the diaper 1 may deteriorate. Therefore, in the dorsal waist circumference portion 40, the dorsal low expansion / contraction region 61 is narrowed as compared with the ventral low expansion / contraction region 61, thereby strengthening the contraction force of the waist circumference elastic member 45 acting on the dorsal waist circumference portion 40. ..

Therefore, in the diaper 1, even if the contraction force acting on the ventral waist circumference portion 30 is weakened, the contraction force acting on the dorsal waist circumference portion 40 is large, so that the ventral waist circumference portion 30 and the dorsal waist circumference portion 40 have a large contraction force. As a whole, a contraction force of an appropriate strength acts in the circumferential direction. Further, as the dorsal waist circumference portion 40 contracts in the left-right direction, the ventral waist circumference portion 30 connected to the dorsal waist circumference portion 40 is easily pulled to both sides in the left-right direction. Therefore, the skin side sheet 31 and the non-skin side sheet 32 constituting the ventral waist circumference portion 30 are in close contact with the wearer's skin so as to be taut, and the ventral waist circumference portion 30 is less likely to slip off. Thereby, when the diaper 1 is worn, it is possible to realize a good fit in the waist portion (waist portion) of the wearer.

Further, in the left-right direction, the one-sided end 62es1 of the dorsal low-stretching region 62 is located on the other side of the one-sided end 11es1 of the absorbent core 11, and the other-sided end 62es2 of the dorsal low-stretching region 62 is located. Is located on one side of the other end 11es2 of the absorbent core 11. That is, in the dorsal waist circumference portion 40, the width W62 of the dorsal low expansion / contraction region 62 in the left-right direction is narrower than the width W11 of the absorbent core 11 in the left-right direction (W62 <W11). By reducing the dorsal low expansion / contraction region 62 in this way, the contraction force of the waistline elastic member 45 acting on the dorsal waistline portion 40 becomes larger than that of the ventral side, and an appropriate contraction force of the waistline member 20 as a whole. Can be easily secured. Further, on the dorsal side, the contractile force of the waistline elastic member 45 acts on the absorbent core 11, so that the absorbent core 11 can be easily fitted to the wearer's body and the leakage of excrement such as feces can be suppressed. Can be done. When the contraction force of the waistline elastic member 45 acts on the absorbent core 11, the absorbent core 11 may bend in the left-right direction. However, when the diaper 1 is worn, the dorsal side is hard to be visually recognized and inconspicuous, so even if the absorbent core 11 is bent on the dorsal side, it is unlikely to cause anxiety to the user.

Further, as shown in FIG. 4, in the left-right direction, one end 61es1 of the ventral low expansion / contraction region 61 is located on one side of the standing starting point 15es1 on one side of the leak-proof wall portion 15, and is ventral. The other end 61es2 of the low expansion / contraction region 61 is located on the other side of the standing starting point 15es2 on the other side of the leak-proof wall portion 15. That is, in the ventral waist circumference portion 30, the width W61 of the ventral low expansion / contraction region 61 in the left-right direction is wider than the distance W15 in the left-right direction of the standing starting points 15es and 15es of the leak-proof wall portion 15 (W61> W).
15). Therefore, when the diaper 1 is worn, the contractile force of the waistline elastic member 35 is unlikely to act on the leak-proof wall portion 15, and the pair of leak-proof wall portions 15 maintain the interval W15 without bending or being distorted. It becomes easier to keep standing upright. As a result, it is difficult for the wearer to feel uncomfortable, and it is possible to suppress lateral leakage of excrement.

Further, as shown in FIG. 2, in the left-right direction, one end 61es1 of the ventral low expansion / contraction region 61 is located on one side of the one side end 10es1 of the absorbent body 10, and the ventral low expansion / contraction region 61 is located on one side. The other end 61es2 of the region 61 is located on the other side of the other end 10es2 of the absorbent body 10. That is, in the ventral waist circumference portion 30, the width W61 in the left-right direction of the ventral low expansion / contraction region 61 is wider than the width W10 in the left-right direction of the absorbent body 10 (W61> W10). Both ends 10es1 and 10es2 of the absorbent body 10 in the left-right direction form a part of the leg circumference opening LH of the diaper 1 and are easily pressed against the wearer's inguinal region. Therefore, if the waistline elastic member 35 overlaps with both ends 10es1 and 10es2 in the left-right direction of the absorbent body 10, the waistline elastic member 35 is likely to be pressed against the skin near the wearer's leg. There is a risk that rubber marks will be easily attached.
On the other hand, in the diaper 1 of the present embodiment, the contractile force due to the waist elastic member 35 is difficult to act on both ends 10es1, 10es2 and the outer regions of the absorbent body 10 in the left-right direction, so that the wearer's leg circumference is difficult to act. It becomes difficult for rubber marks to be left on the area.

Then, in the region between the outer end 10es of the absorbent body 10 (for example, the other end 10es2 in the left-right direction) and the side joint 50 (the other side joint 50 in the left-right direction) in the left-right direction, the ventral side. It is desirable that the width W61s of the low stretch region 61 in the left-right direction is narrower than the width W71s of the ventral stretch region 71 adjacent to the outside of the ventral low stretch region 61 in the left-right direction (W61s <W71s). Since the ventral low expansion / contraction region 61 is widely provided in the ventral waist circumference portion 30, the contraction force is weakened as a whole, and the fit on the ventral side of the wearer may be insufficient. Therefore, in the regions on both sides of the ventral low expansion / contraction region 61 in the left-right direction, the ventral expansion / contraction region 71 is made larger than the ventral low expansion / contraction region 61 so that the contraction force of the waistline elastic member 35 can be easily applied. As a result, the fit of the ventral waist circumference portion 30 is made less likely to be left on the ventral side of the wearer as compared with the case where the ventral elastic region 71 is narrower than the ventral low elastic region 61. It is possible to suppress the deterioration of sex.

On the other hand, the width W61s in the left-right direction of the ventral low-stretch region 61 may be wider than the width W71s of the ventral stretchable region 71 adjacent to the outside of the ventral low-stretch region 61 in the left-right direction (W61s>. W71s). With such a configuration, since the contractile force acting on the ventral waist circumference portion 30 is smaller than in the above-mentioned case, the absorbent main body 10 can be made more difficult to contract. In addition, since the range in which the contractile force due to the elastic member 35 around the waist is difficult to act on both sides of the absorbent body 10 in the left-right direction becomes wide, it is possible to make it difficult for rubber marks to be left on the skin near the legs on the ventral side of the wearer. can.

Further, as shown in FIG. 2, the length L61 in the vertical direction of the ventral low expansion / contraction region 61 is the vertical length of the portion of the ventral expansion / contraction region 71 adjacent to the ventral low expansion / contraction region 61 in the vertical direction. It is longer than L71 (L61> L71). In other words, in the ventral waist circumference portion 30, the length of the portion where the ventral low elasticity region 61 is formed (corresponding to L61) in the vertical direction is the portion where the ventral low expansion / contraction region 61 is not formed. It is longer than the length (corresponding to L71). As a result, the lateral contraction force of the waist elastic member 35 is weakened in a wide range in the vertical direction of the ventral waist circumference portion 30, the absorbent core 11 is less likely to contract, and rubber marks are left on the wearer's skin. It becomes difficult to attach.

On the other hand, contrary to the case shown in FIG. 2, the length L61 in the vertical direction of the ventral low elastic region 61 is above and below the portion of the ventral elastic region 71 adjacent to the ventral low elastic region 61 in the vertical direction. The length may be L71 or less in the direction (L61 ≦ L71). In other words, the length of the portion of the ventral waist circumference portion 30 in which the ventral low-stretch region 61 is formed (corresponding to L61) in the vertical direction is the length of the portion in which the ventral low-stretch region 61 is not formed. It may be (corresponding to L71) or less. With such a configuration, the contractile force of the waistline elastic member 35 acting on the ventral waistline portion 30 can be increased as compared with the case where L61 is larger than L71. For example, when the size of the diaper is large or when it is not desired to reduce the fit of the wearer's waistline, it is desirable that the ventral waistline portion 30 has a certain degree of elasticity. Therefore, in such a case, by adjusting so that L61 ≦ L71, it is possible to suppress the displacement and the deterioration of the fit when the diaper 1 is worn.

Further, at the upper ends of the ventral waist circumference portion 30 and the dorsal waist circumference portion 40, it is desirable that elastic members are continuously arranged from one end in the left-right direction to the other end. In the diaper 1 of the present embodiment, as shown in FIG. 2, the waistline elastic member 35 is continuously arranged between the pair of side joints 50, 50 located at both ends in the left-right direction in the ventral waistline portion 30. Has been done. Similarly, in the dorsal waist circumference portion 40, the waist circumference elastic members 45 are continuously arranged between the pair of side

joint portions

50, 50 located at both ends in the left-right direction. Since the upper ends of the

waist circumference portions

30 and 40 are the portions forming the waist circumference opening BH of the diaper 1, the waist circumference

elastic members

35 and 45 are continuously arranged along the circumferential direction of the waist circumference opening BH. , The fit of the waist opening BH can be improved. Even if the contraction force at the waist opening BH is high, the problem of rubber marks on the wearer's legs is unlikely to occur, and there is a possibility that the wearer may feel uncomfortable when wearing the diaper 1. low.

Further, in the diaper 1, it is desirable that the average stress of the waistline elastic member 35 arranged in the ventral waistline portion 30 is smaller than the average stress of the waistline elastic member 45 arranged in the dorsal waistline portion 40. .. That is, the force required to extend the ventral waist circumference portion 30 provided with the elastic member 35 by a unit length in the left-right direction is the unit length of the dorsal waist circumference portion 40 provided with the elastic member 45 in the left-right direction. It is desirable that it is less than the force required to stretch it.
By arranging the waistline elastic member 35 so that the stress in the ventral waistline portion 30 is weakened, it is possible to prevent rubber marks from being attached to the skin on the ventral side of the wearer. On the other hand, by arranging the elastic member 45 around the waist so that the stress in the ventral waist 40 becomes stronger, the contraction force on the dorsal side is strengthened so as to compensate for the weakened contraction force on the ventral side. When wearing 1, it becomes easy to prevent the

waist circumference portions

30 and 40 from slipping off from the wearer's waist circumference.

The stress can be measured using a tensile tester (for example, manufactured by Shimadzu Corporation: Autograph, etc.) as follows. First, a part of the diaper 1 to be measured is cut out to prepare a sample piece. In the above case, the pair of

side joints

50 and 50 are peeled off to separate the ventral waist circumference 30 and the dorsal waist circumference 40, and the absorbent body 10 is further cut at the central position CL in the vertical direction to dorsoventral. The ventral waist circumference portion 30 and the dorsal waist circumference portion 40 in the separated state are used as sample pieces, respectively. Next, with the sample piece (for example, the ventral waist circumference 30) in the natural state, the length between the jigs of the tensile tester is adjusted so as to be equal to the length in the left-right direction of the sample piece in the natural state, and a pair. The entire side joints 50 and 50 in the vertical direction are grasped and fixed with a jig. After that, the sample piece is pulled in the left-right direction at a constant speed, and the force when the sample piece is extended by a predetermined length (for example, 125 mm) is measured. This measurement is performed n times (for example, n = 3), and the average value is taken as the stress of each sample.

The "natural state" is the state when the diaper 1 is left for a predetermined time. For example, after the diaper 1 in the product state is taken out from the package, the ventral waist circumference portion 30 and the dorsal waist circumference portion 40 are pulled to both outer sides in the left-right direction, and the

waist circumference portions

30 and 40 are set as "extended state". After continuing for 15 seconds, release the pull of the diaper 1 and place it on a flat surface such as a desk. Then, the state in which 5 minutes have passed in such a flat flat placement is regarded as a natural state.

Further, as described above, in order to make the stress in the ventral waist circumference portion 30 smaller than the stress in the dorsal waist circumference portion 40, the waist circumference elastic member when the waist circumference elastic member 35 is attached to the ventral waist circumference portion 30. It is preferable that the extension ratio of 35 is smaller than the extension ratio of the waist elastic member 45 when the waist elastic member 45 is attached to the dorsal waist circumference portion 40. By doing so, the leg opening LH is likely to expand on the ventral side, so that the wearer's legs (toes) are less likely to be caught by the leg opening LH during the movement of wearing the diaper 1, and the wearability of the diaper 1 is improved. Can be made to.

Further, the post-treatment tape 80 may be provided on the non-skin side surface of the dorsal waist circumference portion 40 of the diaper 1 (see FIG. 2). The post-treatment tape 80 is a strip-shaped tape member used when disposing of the diaper 1. For example, by rolling the used diaper 1 from the inseam side to the waist opening side and then fixing it in the rolled state using the post-treatment tape 80, the diaper 1 can be discarded while maintaining its compact form. .. When the stress in the ventral waist circumference 30 is smaller than the stress in the dorsal waist circumference 40, the used diaper 1 is placed so that the dorsal waist circumference 40 is on the outside (that is, the ventral waist circumference 30 is on the inside). When the diaper 1 is rolled, the outer dorsal waist circumference 40 contracts, so that the volume of the rolled diaper 1 can be reduced. Then, by fixing the diaper 1 that has been rolled into small pieces with the post-treatment tape 80 provided on the dorsal waist circumference portion 40, it becomes possible to dispose of the diaper 1 in a more compact form, which is convenient for the user. It is possible to improve the sex.

Further, in the vertical direction, the range of the ventral waist circumference portion 30 in which the ventral low elasticity region 61 is provided is F1 (see FIG. 2), and the range in which the ventral low elasticity region 61 is not provided is F2 (FIG. 2). The average stress of the waistline elastic member 45 arranged in the region R1 corresponding to F1 in the dorsal waist circumference 40 is arranged in the region R2 corresponding to F2 in the dorsal waistline 40. It is desirable that the stress is larger than the average stress of the waistline elastic member 45. In the region F1 of the ventral waist circumference portion 30, since the ventral low expansion / contraction region 61 is provided, the stress due to the ventral waist circumference portion 30 is smaller than that in the region F2. That is, the ventral waist circumference portion 30 has a weak contraction force in the region F1 and tends to slip off from the wearer's body. Therefore, by making the stress stronger than the region R2 in the region R1 corresponding to the region F1 in the dorsal waist circumference portion 40, the region F1 of the ventral waist circumference portion 30 is moved in the left-right direction by the region R1 of the dorsal waist circumference portion 40. It becomes easy to be pulled by, and it is possible to suppress a decrease in contraction force as a whole. This makes it possible to prevent the ventral waist circumference portion 30 and the dorsal waist circumference portion 40 from slipping off the wearer's body when the diaper 1 is worn.

Further, the average stress of the girth elastic member 45 in the region R1u above the center in the vertical direction in the region R1 of the dorsal girth portion 40 is the girth in the region R1d below the center in the vertical direction in the region R1. It is more desirable that the stress is larger than the average stress of the elastic member 45. Of the region R1 of the dorsal waist circumference portion 40, the region on the lower side in the vertical direction is a portion close to the leg circumference opening LH, so that the stress is weaker in this region than the region on the upper side in the vertical direction of the region R1. By doing so, it becomes difficult for an excessive tightening force to act on the wearer's leg circumference, and it is possible to make it difficult for the diaper 1 to cause discomfort when worn. In the present embodiment, since the dorsal low expansion / contraction region 62 is provided overlapping with the portion of the dorsal waist circumference portion 40 in the region R1d, the stress of the waist circumference elastic member 45 is reduced in the region R1d as compared with the region R1u. It has a structure that makes it easy to make it.

Further, in the ventral waist circumference portion 30, among a plurality of continuous elastic members 35s continuously provided from one end to the other end in the left-right direction, the one arranged at the lowermost side in the vertical direction is the lower end portion. When the continuous elastic member 35sd is used, it is desirable that the lower end continuous elastic member 35sd has a portion overlapping with the absorbent core 11 when viewed in the thickness direction. That is, as shown in FIG. 2, it is desirable that the lower end continuous elastic member 35sd is arranged below the upper end 11ea on the ventral side of the absorbent core 11 in the vertical direction. With such a configuration, when the diaper 1 is worn, the upper end portion of the absorbent core 11 is pressed against the wearer's body by the contraction force of the lower end continuous elastic member 35sd, and the upper end portion of the absorbent core 11 is worn. It becomes difficult for a gap to be created between the person's skin and the person's skin. Therefore, it is possible to prevent excrement such as urine from leaking to the outside (upper side) of the absorbent core 11 from the gap.

However, the lower end continuous elastic member 35sd may be arranged above the upper end 11ea on the ventral side of the absorbent core 11. That is, when viewed in the thickness direction, the lower end continuous elastic member 35sd may not have a portion overlapping with the absorbent core 11. In this case, since the absorbent core 11 does not overlap with either the continuous elastic member 35s or the discontinuous elastic member 35c, the contractile force of the waistline elastic member 35 does not act on the absorbent core 11. Therefore, it is possible to more easily suppress the absorption core 11 from contracting in the left-right direction.

Further, the ventral waist circumference portion 30 may be provided with a symbol portion 90 having a symbol such as a picture or a character so that the symbol portion 90 can be visually recognized when the diaper 1 is viewed from the front side (ventral side). FIG. 5 is a plan view of the diaper 1 when viewed from a non-skin side surface, and is a diagram illustrating the arrangement of the design portion 90. As shown in FIG. 5, the design portion 90 is provided so that at least a part thereof overlaps with the ventral waist circumference portion 30 when viewed in the thickness direction. The design portion 90 is formed, for example, by printing a picture, characters, or the like on a predetermined area of the skin side sheet 31 or the non-skin side sheet 32 constituting the ventral waist circumference portion 30. Further, even if the design portion 90 is formed on another member (for example, the liquid impermeable sheet 13a of the absorbent main body 10 or a separate sheet member) provided overlapping with the ventral waist circumference portion 30. good.

When such a symbol portion 90 is provided, it is desirable that the width W90 of the symbol portion 90 is narrower than the width W61 of the ventral low expansion / contraction region 61 in the left-right direction (W61> W90). In the ventral low expansion / contraction region 61, the waist circumference member 30 is difficult to contract in the left-right direction, so that the design portion 90 provided in the region inside the ventral low expansion / contraction region 61 is also difficult to contract in the left-right direction. Therefore, when the user sees the diaper 1 from the front side (ventral side), the design portion 90 can be easily visually recognized.

<Modification example>
6A and 6B are a plan view and a cross-sectional view showing a modified example of the diaper 1. 6A is a diagram corresponding to FIG. 2, and FIG. 6B is a diagram corresponding to FIG. 3. In the modified example shown in FIG. 6, the waistline elastic member 35 is not provided on the ventral waistline portion 30. Other configurations are the same as those of the diaper 1 described above.

In this modification, since the waistline elastic member 35 is not provided, the elasticity does not act in the entire region of the ventral waistline portion 30. That is, in the left-right direction, the ventral low expansion / contraction region 65 is provided from one end to the other end of the ventral waist circumference portion 30. That is, in the diaper 1 of the modified example, since the waistline elastic member 35 is not provided in the ventral waist circumference portion 30, the absorbent core 11 is less likely to contract in the left-right direction, and the rubber around the waistline elastic member 35 is attached to the wearer's abdomen. It can be difficult to make a mark.

However, when wearing the diaper 1 according to such a modification, since the entire ventral waist circumference portion 30 is non-stretchable, the fit of the ventral waist circumference portion 30 is poor, and the waist circumference member 20 is the wearer's body. It may easily slip off. Therefore, in this modification, it is desirable to increase the stress of the waistline elastic member 45 provided in the dorsal waistline portion 40 as compared with the above-described embodiment. By doing so, the contraction force of the waistline elastic member 45 acting on the dorsal waistline portion 40 becomes large, so that the ventral waistline portion 30 connected via the side

joint portions

50, 50 is pulled to both sides in the left-right direction. Therefore, the ventral waist circumference 30 is likely to come into contact with the wearer's body (abdomen) on the surface. Further, when the ventral waist circumference 30 is pulled to both sides in the left-right direction, the pulling force causes the seat members (skin side sheet 31 and non-skin side sheet 32) constituting the ventral waist circumference portion 30. Tension acts to bring the ventral waist circumference 30 into close contact with the wearer's body in a taut state. Therefore, even when the weight of the diaper 1 is increased due to excrement or the like, the ventral waist circumference portion 30 which is in close contact with the wearer's body is stretched, and the misalignment is less likely to occur. Further, in the diaper 1 of the modified example, since the waistline elastic member 35 is not provided in the ventral waist circumference portion 30, the absorbent core 11 is difficult to contract in the left-right direction, and the rubber around the waistline elastic member 35 is attached to the wearer's abdomen. It can be difficult to make a mark.

=== Other embodiments ===
Although the embodiments of the present invention have been described above, the above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the interpretation of the present invention. Further, it is needless to say that the present invention can be changed or improved without departing from the spirit thereof, and the present invention includes an equivalent thereof.

In the diaper 1, the area of each of the ventral waist circumference portion 30 and the dorsal waist circumference portion 40 may be adjusted so as to be included in a predetermined range. For example, when the area of the ventral waist circumference 30 is in the range of 30 to 50, the area of the dorsal waist circumference 40 is preferably in the range of 50 to 70, and the ventral waist circumference 30 and the dorsal waist circumference 40 It is more desirable that the area ratio of is 35:65. By making the area of the dorsal waist circumference portion 40 larger than the area of the ventral waist circumference portion 30, the tightening pressure is reduced even when the stress in the dorsal waist circumference portion 40 is large, causing discomfort to the wearer. It can be difficult.

1 Diapers (pants-type disposable diapers),
10 Absorbent body,
11 Absorbent core, 11b core wrap sheet, 11c constriction,
12 top sheet,
13 back sheet, 13a liquid impermeable sheet, 13b exterior sheet,
15 Leak-proof wall part, 16 Leak-proof wall elastic member, 17 Leg circumference elastic member,
20 Girth member,
30 ventral girth, 30sw side,
31 Skin side sheet,
32 non-skin side sheet, 32f folded part,
35 Girth elastic member (ventral elastic member),
35s continuous elastic member, 35c discontinuous elastic member,
36 skin sheet,
40 Dorsal girth,
40b buttock cover, 40sw side,
41 skin side sheet, 42 non-skin side sheet, 42f folded part,
45 Girth elastic member (dorsal girth elastic member),
45s continuous elastic member, 45c discontinuous elastic member,
46 skin sheet,
50 side joints,
61 Ventral low stretch area (discontinuous part),
62 Dorsal low stretch area (discontinuous part),
65 ventral low stretch area,
71 Ventral stretch area,
72 Dorsal stretch area,
80 Post-treatment tape,
90 design part,
BH waist opening, LH leg opening,
CL center position (vertical direction, longitudinal direction)

Claims

It has a vertical direction, a horizontal direction, and a front-back direction that intersect each other.
It has an absorbent body with a liquid-absorbing absorbent core, a ventral waistline, and a dorsal waistline.
A pants-type disposable diaper provided with a plurality of ventral waist elastic members that expand and contract in the left-right direction on the ventral waist.
The ventral waist circumference portion is a ventral low expansion / contraction region in which a contraction force is reduced as compared with other regions by having a portion in which at least a part of the plurality of ventral waist circumference elastic members is discontinuous in the left-right direction. Have,
In the left-right direction
One end of the ventral hypostretchable region is located unilaterally to one end of the absorbent core.
The other end of the ventral hypostretch region is located on the other side of the other end of the absorbent core.
A pants-type disposable diaper characterized in that when the unfolded pants-type disposable diaper is viewed in the thickness direction, the absorbent core and the ventral hypostretchable region have an overlapping portion.
The pants-type disposable diaper according to claim 1.
A plurality of dorsal waist circumference elastic members that expand and contract in the left-right direction are provided in the dorsal waist circumference portion.
The dorsal waist circumference portion is a dorsal low expansion / contraction region in which the contraction force is reduced as compared with other regions by having a portion in which at least a part of the plurality of the dorsal waist circumference elastic members is discontinuous in the left-right direction. Have,
A pants-type disposable diaper characterized in that the width of the dorsal low stretch region in the left-right direction is narrower than the width of the ventral low stretch region in the left-right direction.
The pants-type disposable diaper according to claim 2.
A pants-type disposable diaper characterized in that the width of the dorsal low stretch region in the left-right direction is narrower than the width of the absorbent core in the left-right direction.
The pants-type disposable diaper according to any one of claims 1 to 3.
The absorbent body has a pair of leak-proof walls on both sides in the left-right direction.
In the left-right direction
One end of the ventral hypostretchable region is located on one side of the one-sided standing starting point of the leak-proof wall portion.
The other end of the ventral hypostretchable region is located on the other side of the other side of the standing origin of the leak-proof wall portion.
Pants-type disposable diapers featuring this.
The pants-type disposable diaper according to any one of claims 1 to 4.
In the left-right direction
One end of the ventral hypostretchable region is located on one side of the one end of the absorbent body.
The other end of the ventral hypostretchable region is located on the other side of the other end of the absorbent body.
Pants-type disposable diapers featuring this.
The pants-type disposable diaper according to claim 5.
At both ends in the left-right direction, the ventral waist circumference portion and the dorsal waist circumference portion are provided with a pair of side joint portions that are connected in an annular shape.
In the region between the lateral end of the absorbent body in the left-right direction and the side junction in the left-right direction.
A pants-type disposable diaper characterized in that the width of the ventral low-stretch region in the left-right direction is narrower than the width of the region adjacent to the outside of the ventral low-stretch region in the left-right direction.
The pants-type disposable diaper according to claim 5.
At both ends in the left-right direction, the ventral waist circumference portion and the dorsal waist circumference portion are provided with a pair of side joint portions that are connected in an annular shape.
In the region between the lateral end of the absorbent body in the left-right direction and the side junction in the left-right direction.
A pants-type disposable diaper characterized in that the width of the ventral low-stretch region in the left-right direction is wider than the width of the region adjacent to the outside of the ventral low-stretch region in the left-right direction.
The pants-type disposable diaper according to any one of claims 1 to 7.
In the ventral waist circumference portion, the length of the portion provided with the ventral low expansion / contraction region in the vertical direction is longer than the length of the portion not provided with the ventral low expansion / contraction region in the vertical direction. Pants-type disposable diapers featuring this.
The pants-type disposable diaper according to any one of claims 1 to 7.
In the ventral waist circumference portion, the length of the portion provided with the ventral low expansion / contraction region in the vertical direction is equal to or less than the length of the portion not provided with the ventral low expansion / contraction region in the vertical direction. , A pants-type disposable diaper featuring that.
The pants-type disposable diaper according to any one of claims 1 to 9.
An elastic member is continuously arranged at the ventral waist circumference portion and the upper end portion of the dorsal waist circumference portion from one end to the other end in the left-right direction. Pants-type disposable diapers.
The pants-type disposable diaper according to any one of claims 1 to 10.
A plurality of dorsal waist circumference elastic members that expand and contract in the left-right direction are provided in the dorsal waist circumference portion.
A pants-type disposable diaper characterized in that the average stress of the ventral waist elastic member in the ventral waist circumference portion is smaller than the average stress of the dorsal waist circumference elastic member in the dorsal waist circumference portion.
The pants-type disposable diaper according to claim 11.
In the vertical direction of the ventral waist circumference, the range where the ventral low stretch region is provided is defined as F1, and the range where the ventral low stretch region is not provided is defined as F2.
In the vertical direction of the dorsal girth portion, the average stress of the dorsal girth elastic member in the range corresponding to F1 is larger than the average stress of the dorsal girth elastic member in the range R2 corresponding to F2. Pants-type disposable diapers characterized by being large.
The pants-type disposable diaper according to claim 12.
In the vertical direction of the dorsal girth portion, the average stress of the dorsal girth elastic member in the upper half of the range corresponding to F1 is in the lower half of the range corresponding to F1. A pants-type disposable diaper characterized in that the stress is larger than the average stress of the dorsal waist elastic member.
The pants-type disposable diaper according to any one of claims 1 to 13.
In the ventral waist circumference portion, among the ventral waist circumference elastic members continuously arranged from one end in the left-right direction to the other end, the position located on the lowermost side in the vertical direction. The ventral waist circumference elastic member is a pants-type disposable diaper characterized in that it is located below the ventral upper end of the absorbent core in the vertical direction.
The pants-type disposable diaper according to any one of claims 1 to 13.
In the ventral waist circumference portion, among the ventral waist circumference elastic members continuously arranged from one end in the left-right direction to the other end, the position located on the lowermost side in the vertical direction. The ventral waist circumference elastic member is a pants-type disposable diaper characterized in that it is located above the ventral upper end of the absorbent core in the vertical direction.
The pants-type disposable diaper according to any one of claims 1 to 15.
When viewed in the thickness direction, it has a design portion that overlaps with at least a part of the ventral waist circumference portion.
A pants-type disposable diaper characterized in that the width of the symbol portion in the left-right direction is narrower than the width of the ventral low expansion / contraction region in the left-right direction.