JP7107662B2 - pants type diaper - Google Patents

Description

The present invention relates to pants-type diapers .

Conventionally, disposable diapers and the like are known as absorbent articles for absorbing excrement such as urine. For example, Document 1 describes that a plurality of slits 8 penetrating in the thickness direction are formed to prevent stuffiness in the open-type disposable diaper 1 and the underpants-type disposable diaper 30 .

Japanese Patent Application Laid-Open No. 2002-65731

However, in the natural state of the disposable diapers 1 and 30 shown in Document 1, the shrinkage of the waist elastic member 7 prevents the wearer of the disposable diapers 1 and 30 and the person who is going to wear them from visually recognizing the slits 8 . In some cases, good air permeability could not be recognized from the appearance.

The present invention has been made in view of the conventional problems as described above, and an object of the present invention is to make it easier for the wearer of the absorbent article or the person who is going to wear it to visually recognize the through holes of the absorbent article. To make it easy to recognize the goodness of breathability by doing so.

The main invention for achieving the above object has a vertical direction, a horizontal direction, and a front-back direction that intersect with each other,
a front girth;
a rear girth;
an absorber;
an elastic member that expands and contracts in the lateral direction;
A pants-type diaper comprising a hole penetrating in the front-rear direction in at least one of the front waist portion and the rear waist portion,
At least one of the front waist portion and the rear waist portion has a skin side sheet and a non-skin side sheet provided on the non-skin side of the skin side sheet,
The skin-side sheet and the non-skin-side sheet are provided on the non-skin side of the absorber,
At least one hole is provided in a non-overlapping region in which the front waistline portion and the rear waistline portion do not overlap in the front-rear direction of the front waistline portion and the rear waistline portion,
The elastic member is provided between the skin-side sheet and the non-skin-side sheet above the absorber in the vertical direction,
The rear waist portion,
a rear overlap region overlapped with the front waist portion in the front-rear direction;
The front waist portion and a rear non-overlapping region that are not overlapped in the front-rear direction,
The front waist portion and the rear waist portion are joined to each other at both ends in the left-right direction, and the rear non-overlapping region protrudes downward from the lowermost ends of the joined both ends. is provided in the
At least one hole is provided in each of the rear overlapping region and the rear non-overlapping region,
The number of holes provided per unit area in the rear non-overlapping region is smaller than the number of holes provided per unit area in the rear overlapping region. It is a pants-type diaper .
Other features of the present invention will become apparent from the description of the specification and accompanying drawings.

ADVANTAGE OF THE INVENTION According to this invention, it becomes easy to visually recognize the through-hole of an absorbent article, and can make it easy to realize the good air permeability.

FIG. 1A is a schematic front view of the diaper 1 in its natural state as seen from the front side. FIG. 1B is a schematic rear view of the diaper 1 in its natural state as seen from the rear side. FIG. 2 is a plan view of the diaper 1 in the unfolded and stretched state, viewed from the skin side. FIG. 3 is a sectional view taken along line III--III in FIG. FIG. 4 is a sectional view along IV-IV in FIG. 5A and 5B are diagrams showing modifications of the non-overlapping regions provided on the diaper 1. FIG. 6A is a schematic diagram of the AA cross section of the rear waist portion 30 in FIG. 2, and FIG. 6B is a schematic diagram of the BB cross section of the rear waist portion 30 in FIG. FIG. 11 is a schematic plan view showing a modification of the arrangement of holes 50 in a rear non-overlapping region 30NL;

At least the following matters will become apparent from the descriptions of this specification and the accompanying drawings.
It has an up-down direction, a left-right direction, and a front-back direction that intersect each other, and has a front waist portion and a rear waist portion, and penetrates in at least one of the front waist portion and the rear waist portion in the front-back direction. a non-overlapping region in which the front waistline portion and the back waistline portion do not overlap in the front-back direction of the front waistline portion and the back waistline portion. and at least one said hole.

According to such an absorbent article, in the natural state, the holes are easily visible from both the front side and the back side. In addition, since the hole is provided in the non-overlapping region, the user can see from one side in the front-rear direction to the other side through the hole, thereby easily recognizing the through hole. . Therefore, it is possible to make it easier for the user to visually recognize the through-holes of the absorbent article and to easily recognize the good air permeability.

In this absorbent article, the back waist portion includes a back non-overlapping region that is not overlapped with the front waist portion in the front-rear direction, and at least one hole is formed in the back non-overlapping region. It is desirable to have

According to such an absorbent article, in the back waist portion, the holes are easily visible from both the front side and the rear side, and it is easy to recognize that the holes are through holes. Therefore, it is possible to make it easier for the user to visually recognize the through-holes of the absorbent article and to easily recognize the good air permeability.

In such an absorbent article, the front waistline portion and the back waistline portion are joined to each other at both ends in the left-right direction, and the rear non-overlapping region extends from the lowermost end of the joined both ends. is preferably provided in the portion protruding downward.

According to such an absorbent article, the rear non-overlapping region functions as a buttocks cover covering the buttocks of the wearer when the absorbent article is worn, and the holes provided in the buttocks cover part is easily recognized by the user. This allows the user to recognize that the buttocks, which tend to sweat, have good breathability.

In this absorbent article, the rear waist portion includes an elastic member that expands and contracts in the left-right direction, and the rear waist portion has a rear overlap region overlapping the front waist portion in the front-rear direction. and the distance between the first lower end elastic member located at the lowest side in the rear non-overlapping region and the elastic member adjacent to the upper side of the first lower end elastic member is the largest in the rear side overlapping region. An absorbent article, characterized in that the space between a second lower end elastic member located on the lower side and the elastic member adjacent to the upper side of the second lower end elastic member is larger than the interval.
is desirable.

According to such an absorbent article, since the contractile force in the rear non-overlapping region can be made smaller than the contractile force in the rear non-overlapping region, the pores in the rear non-overlapping region are covered with wrinkles. It is possible to reduce fear and make it easier to visually recognize the holes in the back waist portion even when the absorbent article is viewed from the front side.

In such an absorbent article, it is desirable that the tension of the first bottom elastic member is smaller than the tension of the second bottom elastic member.

According to such an absorbent article, since the contractile force in the rear non-overlapping region can be made smaller, the possibility that the holes in the rear non-overlapping region are covered with wrinkles can be reduced, and the absorbent article can be Also when viewed from the front side, the hole of the rear waist portion can be more easily visually recognized.

In this absorbent article, it is desirable that at least one hole be provided below the first bottom elastic member in the rear non-overlapping region in the vertical direction.

According to such an absorbent article, since tension by the elastic member (first lower end elastic member) is less likely to act on the area below the first lower end elastic member, wrinkles are less likely to be formed. Therefore, the holes arranged in this region are less likely to be affected by wrinkles and shrinkage, and are more visible.

In such an absorbent article, a liquid-absorbent absorbent body is provided, the front upper end of the absorbent body is joined to the front waistline, and the rear upper end of the absorbent body is joined to the rear waistline. At both ends of the absorbent main body in the left-right direction, leg elastic members that expand and contract along the up-down direction are provided. It is desirable that at least one hole be provided in a region that does not overlap with the stretchable range of the elastic member around the leg.

According to such an absorbent article, it is difficult for the contractile force of the leg elastic members to act on the region that does not overlap the range in which the leg elastic members exhibit stretchability in the vertical direction. The formed holes are less likely to shrink in the vertical direction, making it easier to suppress deterioration of visibility. Therefore, it becomes easier for the user to recognize that the rear non-overlapping region has good air permeability.

In such an absorbent article, a liquid-absorbent absorbent body is provided, the front upper end of the absorbent body is joined to the front waistline, and the rear upper end of the absorbent body is joined to the rear waistline. At both ends of the absorbent main body in the left-right direction, leg elastic members that expand and contract along the up-down direction are provided. In the region that overlaps the range in which elasticity is exhibited by the elastic member around the legs, from one end of the absorbent main body in the left-right direction to one end of the absorbent main body in the left-right direction and the rear end of the absorbent main body. It is desirable that at least one hole be provided at a position that is at least half the distance from one end of the side waist portion.

According to such an absorbent article, since the holes are arranged at a predetermined distance or more from the leg elastic members, it is difficult for the contractile force of the leg elastic members to act to the positions of the holes. It is difficult to shrink in the vertical direction, and it becomes easy to suppress deterioration of visibility. This makes it easier for the user to recognize that the rear non-overlapping region has good air permeability.

In such an absorbent article, the rear waist portion includes a rear overlapping region overlapping the front waist portion in the front-rear direction, and a rear non-overlapping region not overlapping the front waist portion in the front-rear direction. , wherein the number of holes provided per unit area in the rear non-overlapping region is less than the number of holes provided per unit area in the rear overlapping region. , is desirable.

According to such an absorbent article, the strength of the rear non-overlapping region is excessively lowered by reducing the pore density in the rear non-overlapping region, where the strength is likely to be lower than that of the rear non-overlapping region. can be suppressed. As a result, it is possible to make the rear non-overlapping region less likely to tear and to make each hole more conspicuous, thereby making it easier for the user to perceive good breathability.

===About the disposable diaper according to the present embodiment===
<<<Regarding the configuration of the disposable diaper 1>>>
FIG. 1A is a schematic front view of a diaper 1 in a natural state as an example of the absorbent article of the present embodiment, viewed from the front side. FIG. 1B is a schematic rear view of the diaper 1 in its natural state as seen from the rear side. FIG. 2 is a plan view of the diaper 1 in the unfolded and stretched state, viewed from the skin side. FIG. 3 is a sectional view taken along line III--III in FIG. FIG. 4 is a sectional view along IV-IV in FIG.

In the following description, the diaper 1 in the state (natural state) shown in FIG. . In addition, the diaper 1 has a "horizontal direction" that intersects with the vertical direction, and a "front-rear direction" that intersects with the vertical direction and the horizontal direction. Also called Furthermore, the front-rear direction is also called the "thickness direction", the side that contacts the wearer is called the "skin side", and the opposite side is called the "non-skin side". In addition, the longitudinal direction of the diaper 1 in the state of FIG. 2 (unfolded state and extended state) is also referred to as "longitudinal direction", one side of the longitudinal direction is referred to as "abdominal side", and the other side is referred to as "back side". The end on one side and the end on the other side are also referred to as "upper side", and the substantially central portion C10 side in the longitudinal direction is also referred to as "lower side". CC in FIG. 2 etc. indicates the center in the left-right direction.

In addition, the "natural state" of the diaper 1 is defined as follows. First, after the diaper 1 packed as a product is taken out of the package, the front waistline portion 20 and the rear waistline portion 30 are pulled outward on both sides in the left-right direction, and the front waistline portion 20 and the rear waistline portion 30 are separated from each other. Stretch until the length matches or approximates the dimensions of the unit. After continuing this stretched state for 15 seconds, the stretched state of the diaper 1 is released and placed on a flat surface such as a desk. The state in which the diaper 1 is placed on the flat surface for 5 minutes is the natural state. The "unfolded state" is a state in which the side end portions 20a of the front waistline portion 20 and the side end portions 30a of the rear waistline portion 30 are separated, opened, and the entire diaper 1 is unfolded in a plane. The “stretched state” refers to a state in which the diaper 1 (the front waist portion 20 and the rear waist portion 30) is stretched until wrinkles are removed. Specifically, the members constituting the diaper 1 (the front waist portion 20 and It refers to a state in which the rear waist portion 30) has been stretched until its dimensions match or are close to the dimensions of the member alone.

A disposable diaper 1 (hereinafter referred to as "diaper 1") according to the present embodiment is a so-called three-piece pants-type diaper mainly worn by infants, and has an absorbent material placed between the wearer's crotch. A main body 10, a front waist part 20 joined to the front upper end of the absorbent main body 10 and covering the abdomen of the wearer, and a rear waist part joined to the rear upper end of the absorbent main body 10 and covering the back. has 30. The front waistline portion 20 and the rear waistline portion 30 are also referred to as "the waistline portions" respectively.

As shown in FIG. 2, the diaper 1 in the unfolded state has a front waistline portion 20 and a rear waistline portion 30 arranged in parallel with a gap in the longitudinal direction. The absorptive main body 10 is spanned, and the longitudinal ends of the absorptive main body 10 and the waist portions 20 and 30 are respectively joined and fixed with an adhesive or the like, and have a substantially H shape in plan view. Then, the absorbent main body 10 is folded in half from the substantially H-shaped unfolded state with the substantially central portion C10 in the longitudinal direction as the folding position, and the front waist portion 20 and the rear waist portion 30 facing each other are folded in the folded state. Both ends in the left-right direction, that is, side ends (also referred to as “ends”) 20a of the front waistline portion 20 and side ends 30a (also referred to as “ends”) of the rear waistline portion 30 are welded or the like. When joined, the front waistline portion 20 and the rear waistline portion 30 are annularly connected to form a pants-type diaper 1 provided with a waist opening BH and a pair of leg openings LH and LH as shown in FIGS. 1A and 1B. Become.

As shown in FIGS. 2, 3 and 4, the absorbent main body 10 has a substantially rectangular shape in plan view, and the longitudinal direction of the absorbent main body 10 is arranged along the vertical direction. The absorbent main body 10 includes an absorbent body 11, a top sheet 13 covering the absorbent body 11 from the skin side, and an exterior sheet 14 and a back sheet 15 covering the absorbent body 11 from the non-skin side.

The absorbent body 11 has a liquid-absorbent core 11c capable of absorbing excrement such as urine, and a liquid-permeable core wrap sheet 11r such as tissue paper covering the outer peripheral surface of the absorbent core 11c. . The absorbent core 11c is a molded body obtained by molding a predetermined liquid absorbent material into a substantially hourglass shape in plan view, which is an example of a predetermined shape. Examples of the liquid-absorbent material include liquid-absorbent fibers such as pulp fibers and liquid-absorbent granules such as superabsorbent polymers (so-called SAP).

The top sheet 13 is a liquid-permeable sheet such as a planar-sized nonwoven fabric projecting vertically and horizontally from the absorbent body 11 . The back sheet 15 is a flat-sized sheet projecting vertically and horizontally from the absorbent body 11, and is a liquid-impermeable leak-proof sheet. An exterior sheet 14 of nonwoven fabric is provided on the non-skin side of the back sheet 15 .

Both sides of the absorbent body 10 in the left-right direction, that is, the parts forming the leg openings LH, are provided with leg gathers LG (leg-surrounding stretchable parts) that stretch and contract along the longitudinal direction of the absorbent body 10, respectively. . The leg gathers LG are fixed by sandwiching a leg elastic member 45 such as rubber thread stretched along the longitudinal direction of the absorbent body 10 between the back sheet 15 and the outer sheet 14 in the thickness direction. (see FIG. 4, etc.). The leg elastic members 45 impart stretchability to the leg gathers LG along the longitudinal direction (vertical direction) of the absorbent main body 10, improving the fit of the leg openings LH when the diaper 1 is worn.

A pair of leg side gathers LSG (three-dimensional gathers) are provided inside the leg gathers LG in the lateral direction of the absorbent main body 10 . The leg side gathers LSG are provided on the skin side of the absorbent main body 10 and have a function as a leak prevention wall that prevents liquid leakage from the gaps of the leg loops. The leg side gathers LSG are formed by raising the exterior sheets 14 from the left and right ends of the absorbent body 10 toward the skin. A leak-proof wall elastic member 46 such as a thread rubber stretched along the longitudinal direction of the absorbent main body 10 is provided at the inner end in the left-right direction of the leg side gathers LSG. The leg side gathers LSG stand up toward the skin by imparting stretchability with the members 46 .

As shown in FIG. 3 , the front waist portion 20 is formed by overlapping and joining a skin-side sheet 21 and a non-skin-side sheet 22 in order from the skin side in the thickness direction, and the rear waist portion 30 is formed in the thickness direction. A skin-side sheet 31 and a non-skin-side sheet 32 are overlapped and joined in order from the skin side. The skin-side sheet 21, the non-skin-side sheet 22, and the skin-side sheet 31 and the non-skin-side sheet 32 are all non-woven fabrics such as spunbond or SMS (spunbond/meltblown/spunbond), and are generally rectangular sheets in plan view. Consists of parts. In this embodiment, the skin-side sheets 21 and 31 are made of SMS non-woven fabric, and the non-skin-side sheets 22 and 32 are made of spunbond non-woven fabric. The spunbonded nonwoven fabric may be composed of a single fiber of a thermoplastic resin such as polypropylene (PP) or polyethylene (PE), or a composite fiber such as a sheath-core structure of PP and PE.

The skin-side sheet 21 and the non-skin-side sheet 22, and the skin-side sheet 31 and the non-skin-side sheet 32 are respectively joined with an adhesive such as hot melt to form the front waist portion 20 and the rear waist portion 30. there is

As shown in FIG. 3, the upper end portion of the front waist portion 20 is formed so that the non-skin side sheet 22 extends from the front upper end 20t, which is the upper end of the front waist portion 20, as a starting point in order to improve the touch and durability. It is folded downward on the skin side to form a folded portion 22f. Similarly, in the upper portion of the rear waist portion 30, the non-skin side sheet 32 is folded back downward on the skin side starting from the rear upper end 30t, which is the upper end of the rear waist portion 30, to form a folded portion 32f. ing.

In addition, the front waist portion 20 includes a sheet member 24 arranged to cover from the lower end of the folded portion 22f to the upper end of the absorbent body 10 on the ventral side from the skin side. Similarly, the back waist portion 30 includes a sheet member 34 arranged to cover from the lower end of the folded portion 32f to the upper end of the absorbent body 10 on the dorsal side from the skin side. The sheet members 24 and 34 are rectangular sheet members made of nonwoven fabric or the like. The sheet members 24 and 34 can prevent the vertical ends of the absorbent body 10 from coming into direct contact with the wearer's skin, and can improve the feel of the waist when worn. . In addition, the sheet members 24 and 34 can increase the strength of the upper end portions of the front waistline portion 20 and the rear waistline portion 30 in the vertical direction.

Further, the front waist portion 20 and the rear waist portion 30 are provided with a plurality of holes 50 penetrating from the skin side to the non-skin side at predetermined intervals in the vertical direction and the horizontal direction (see FIGS. 1 and 2). ). Details of the holes 50 will be described later.

Between the skin-side sheet 21 and the non-skin-side sheet 22 of the front waist portion 20, a plurality of elastic members 25, 25 . The elastic member 25 is joined and fixed to the skin-side sheet 21 and the non-skin-side sheet 22 with an adhesive or the like while being stretched in the left-right direction. The plurality of elastic members 25, 25, .

Similarly, between the skin-side sheet 31 and the non-skin-side sheet 32 of the back waist portion 30, a plurality of elastic members 35, 35 . The elastic member 35 is joined and fixed to the skin-side sheet 31 and the non-skin-side sheet 32 with an adhesive or the like while being stretched in the left-right direction. The plurality of elastic members 35, 35, .

The elastic members 25 and 35 impart elasticity in the lateral direction to the front waist portion 20 and the rear waist portion 30, and form a plurality of wrinkles in the front waist portion 20 and the rear waist portion 30 in a natural state. Most of the wrinkles formed in the front waistline portion 20 and the rear waistline portion 30 are shaped along the vertical direction by contracting the sheets 21, 22, 31, 32 in the horizontal direction.

In addition, the elastic members 25 and 35 have a discontinuous region that overlaps the absorber 11 near the central portion in the left-right direction, so that the elastic members 25 and 35 do not exhibit stretchability in this region. As a result, contraction in the lateral direction acting on the absorbent body 11 is suppressed, and the absorbent body 11 can be easily maintained substantially flat, so leakage of excrement and the like can be suppressed.

<<<Regarding hole 50>>>
The hole portion 50 will be described below. A plurality of holes 50 provided in the front waist portion 20 and the rear waist portion 30 penetrate the skin-side sheets 21, 31 and the non-skin-side sheets 22, 32, respectively. Improves breathability from the side to the non-skin side. The holes 50 of the front waist portion 20 and the rear waist portion 30 are substantially circular and of substantially the same size. As shown in FIG. 2, in the front waist portion 20, a plurality of holes 50 are arranged in a zigzag pattern in a region 11f outside the absorbent main body 10 in the left and right directions and overlapping the absorbent body 11 in the vertical direction. . At this time, it is preferable that the elastic member 25 is not cut by the hole 50 , that is, the elastic member 25 is not discontinued by the hole 50 . As shown in FIG. 2, the hole portion 50 in this embodiment is arranged in a region between the vertically adjacent elastic members 25, 25 so as not to overlap with the elastic member 25. Therefore, the elastic member 25 is It is not made discontinuous by the holes 50 .

Similarly, in the rear waist portion 30, a plurality of holes 50 are arranged in a zigzag pattern in a region 11b that overlaps with the absorbent body 11 in the vertical direction and outside the absorbent body 10 in the horizontal direction. As shown in FIG. 2, each hole 50 is arranged between the elastic members 35, 35 adjacent in the vertical direction so as not to overlap with the elastic member 35. It is not made discontinuous by the part 50 .

In addition, the area|region with which the hole part 50 is provided is not restricted to this. For example, in the front waistline portion 20 and the rear waistline portion 30, even if the holes 50 are provided in a region above the regions 11f and 11b in the vertical direction, a region above the upper end portion of the absorbent body 11, or the like. good.

The diaper 1 has an overlapping region in which the front waist portion 20 and the rear waist portion 30 are overlapped in the front-rear direction, and a non-overlapping region in which the front waist portion 20 and the rear waist portion 30 are not overlapped in the front-rear direction. Here, "overlapped in the longitudinal direction" means that the front waistline portion 20 and the rear waistline portion 30 overlap in the longitudinal direction in a natural state. Similarly, "not overlapped in the longitudinal direction" means that the front waistline portion 20 and the rear waistline portion 30 do not overlap in the longitudinal direction in the natural state. That is, when a person who intends to wear the diaper 1 (or a person who has purchased it) takes out the diaper 1 from the package and actually uses it, the areas where the front waistline portion 20 and the rear waistline portion 30 appear to overlap overlap. The non-overlapping area is the area that overlaps and cannot be seen.

In the present embodiment, as shown in FIGS. 1A and 1B, in the region where the side end portions 20a and 30a are formed in the vertical direction, the front waist portion 20 and the rear waist portion 30 are arranged in the longitudinal direction. is duplicated in On the other hand, the regions below the side ends 20a and 30a do not overlap each other. That is, the rear waist portion 30 has a rear overlap region 30L overlapping the front waist portion 20 in a region that overlaps the side end portion (end portion) 30a in the front-rear direction. A rear non-overlapping region 30NL that is not overlapped with the front waist portion 20 is provided in a region that protrudes downward from the lowermost end of 30a. In the diaper 1, at least one or more holes 50 are provided in the rear non-overlapping region 30NL. The rear non-overlapping region 30NL is a portion of the diaper 1 in the natural state that is visible from both the front side and the rear side (see FIGS. 1A and 1B). Therefore, the hole 50 arranged in this portion is easily visible from both the front side and the rear side in the natural state, and is easily recognized as a through hole.

If the hole portion 50 is provided only in the overlap region where the front waist portion 20 and the rear waist portion 30 are overlapped in the front-rear direction, the hole portion 50 is provided only from either the front side or the rear side in the overlap region. The portion 50 cannot be visually recognized. Furthermore, in this case, since the waist portions 20 and 30 are provided so as to overlap the hole portion 50 in the front-rear direction, it is difficult to recognize that the hole portion 50 is a through hole. For example, when a user of the diaper 1 (a person trying to wear the diaper 1 or a wearer of the diaper 1) sees the hole 50 provided in the overlapping region of the front waist portion 20 from the front side in the front-rear direction, It may be difficult to recognize that the hole 50 is a through hole because the hole 50 seems to be blocked by the rear waist portion 30 that is superimposed on the rear side in the front-rear direction.

On the other hand, in the present embodiment, since the holes 50 are provided in the rear non-overlapping region 30NL, the user of the diaper 1 can see from one side in the front-rear direction through the holes 50 to the other side. becomes possible. That is, the hole portion 50 can be visually recognized from both the front side and the rear side, and it is easy to recognize that it is a through hole. Therefore, it becomes easy to recognize that the diaper 1 has good breathability. In addition, the rear non-overlapping portion 30NL is a portion that functions as a buttocks cover that covers the buttocks of the wearer when the diaper 1 is worn. Therefore, the diaper 1 can make the user recognize that it has good breathability in the buttock region, which tends to sweat when worn.

1A and 1B, the rear non-overlapping region 30NL is shown in the rear waist portion 30 as the non-overlapping region of the diaper 1, but other portions of the front waist portion 20 and the rear waist portion 30 Non-overlapping regions may be provided. 5A and 5B are diagrams showing modifications of the non-overlapping regions provided on the diaper 1. FIG. FIG. 5A is a schematic front view of the diaper 1 of the modification seen from the front side in the natural state, and FIG. 5B is a schematic rear view of the diaper 1 of the modification seen from the rear side in the natural state. As shown in FIGS. 5A and 5B, in the diaper 1 of the modified example, the upper end 30t of the rear waist portion 30 is located above the upper end 20t of the front waist portion 20 in the vertical direction. That is, the upper end portion of the rear waist portion 30 of the modified example protrudes upward from the upper end 20t of the front waist portion 20, and the protruding region is the rear side portion that is not overlapped with the front waist portion 20 in the front-rear direction. The non-overlapping area is 30NLU. A hole 50 is provided in the rear non-overlapping region 30NLU.

Also in this modification, the holes 50 provided in the rear non-overlapping region 30NLU are visible from both the front side and the rear side, and it is apparent at a glance that they are through holes. Therefore, the user can easily recognize that the modified diaper 1 has good breathability in the rear non-overlapping region 30NLU. 5A and 5B, the rear non-overlapping region 30NLU is provided at the upper end portion of the rear waist portion 30, but the non-overlapping region is provided on the front waist portion 20 side, and the front waist portion 20 A hole 50 may be provided in the overlap region. In this case, as in the case described above, the holes 50 are visible from both the front side and the rear side, and it is obvious at a glance that they are through holes, so that the diaper 1 has good breathability. It is possible to make it easier for the user to recognize that he/she is doing it.

Further, in the diaper 1, as shown in FIG. 2, the elastic member 35a (first elastic member) positioned on the lowest side in the rear non-overlapping region 30NL and the elastic member adjacent to the upper side in the vertical direction of the elastic member 35a. 35b, the elastic member 35c located at the lowermost position in the region of the rear waist portion 30 overlapping the front waist portion 20 (the region where the side ends 20a, 30a are formed in the vertical direction). (Lx>Ly). By arranging the elastic member 35 in this way, the contractile force of the non-overlapping rear non-overlapping region 30NL is made smaller, the number of wrinkles formed in the rear non-overlapping region 30NL is reduced, and the number of wrinkles formed in the rear non-overlapping region 30NL is reduced. At 30NL, the hole 50 can be easily visually recognized.

Here, the "contraction force" is a force that maintains the contracted state of the front waist portion 20 or the rear waist portion 30 in the natural state. More specifically, when the front waistline portion 20 or the rear waistline portion 30 is divided into right and left halves at any position in the left-right direction of the diaper 1, the right and left halves are mutually divided. The force acting is the contractile force. The greater the contraction force, the more contracted the product will be in the natural state, and the more wrinkles will be generated.

6A is a schematic diagram of the AA cross section of the rear waist portion 30 in FIG. 2, and FIG. 6B is a schematic diagram of the BB cross section of the rear waist portion 30 in FIG. FIG. 6A shows a cross section of the area included in the interval Ly described above, and FIG. 6B shows a cross section of the area included in the interval Lx described above. In FIGS. 6A and 6B, the skin-side sheet 31 and the non-skin-side sheet 32 are shown as being integrated, and the cross section thereof is indicated by the hatched area diagonally to the lower left.

As shown in FIGS. 6A and 6B, the elastic member 35 contracts in the left-right direction, so that the rear waist portion 30 contracts in the left-right direction, forming a plurality of wrinkles undulating in the thickness direction. At this time, since the AA cross section shown in FIG. 6A has a larger contractile force than the BB cross section shown in FIG. is larger in the AA section than in the BB section.

Therefore, in FIG. 6A, in which many wrinkles are formed, there are holes 50 that are hidden by the wrinkles, and holes 50 that can be visually recognized when the rear waist part 30 is viewed from the non-skin side. number will be reduced. Further, as the rear waist portion 30 itself is contracted in the lateral direction, the hole portion 50 is also contracted in the lateral direction, making it difficult to visually recognize the hole portion 50 . On the other hand, in FIG. 6B with fewer wrinkles, when the rear waist portion 30 is viewed from the non-skin side, the holes 50 are less likely to be hidden by the wrinkles. In addition, in FIG. 6B, since the contraction in the left-right direction is smaller than in the case of FIG. 6A, the degree of contraction is smaller than the contraction in the left-right direction of the hole 50, so the hole 50 is easier to visually recognize. .

In addition, the tension of the lowermost elastic member 35a in the rear non-overlapping region 30NL is the tension of the lowermost elastic member 35c in the region of the rear waist portion 30 overlapping the front waist portion 20. is more preferably less than As a result, the shrinkage force of the rear non-overlapping region 30NL is made smaller, the number of wrinkles formed in the rear non-overlapping region 30NL is reduced, and the holes 50 are covered with wrinkles in the rear non-overlapping region 30NL. It is possible to reduce the possibility that the diaper 1 will be tucked away, and make it easier to visually recognize the holes in the rear non-overlapping region 30NL when the diaper 1 is viewed from either the front side or the rear side.

Further, it is more preferable that the hole portion 50 is provided further below the elastic member 35a located on the lowest side in the rear non-overlapping region 30NL. In the region below the elastic member 35a, the tension of the elastic member 35 is less likely to act and contraction is less likely than in other regions, so wrinkles are less likely to be formed in the rear waist portion 30. As shown in FIG. Therefore, the holes 50 arranged in this area are less likely to be affected by wrinkles and shrinkage, and are more easily visible. This makes it easier for the user to recognize the good breathability of the diaper 1 .

In addition, as shown in FIG. 2, at least a part of the holes 50 provided in the rear non-overlapping region 30NL is stretchable in the vertical direction by the leg elastic members 45 forming the leg gathers LG. It is arranged in a region that does not overlap with the developed range (the range indicated by the solid line in FIG. 2, hereinafter also referred to as the “effective length” of the leg elastic member 45). In other words, at least one hole 50 is provided in a region of the rear non-overlapping region 30NL that does not overlap the effective length of the leg elastic member 45 in the vertical direction.

In the effective length range of the leg-hole elastic members 45 in the vertical direction, a force acts to contract the rear non-overlapping region 30NL in the vertical direction. Therefore, the holes 50 arranged in this region are likely to be contracted in the vertical direction and may be difficult to see. On the other hand, in a region that does not overlap with the range (effective length) in which elasticity is exhibited by the leg elastic members 45 in the vertical direction, the contractile force in the vertical direction by the leg elastic members 45 is less likely to act. The holes 50 arranged in this area are less likely to shrink in the vertical direction, making it easier to suppress deterioration of visibility. Therefore, since the holes 50 are provided in the area that does not overlap with the effective length of the leg elastic member 45, it is easy for the user to recognize that the rear non-overlapping area 30NL has good air permeability. Become.

However, the hole portion 50 may be provided in a region of the rear non-overlapping region 30NL that overlaps the effective length of the leg elastic member 45 in the vertical direction. FIG. 7 is a schematic plan view showing a modification of the arrangement of the holes 50 in the rear non-overlapping region 30NL. 7, of the plurality of holes 50 provided in the rear non-overlapping region 30NL, the hole 50L is arranged in a region overlapping the effective length of the leg elastic member 45 in the vertical direction.

When the hole portion 50 overlaps the effective length of the leg elastic member 45 in the vertical direction, the hole portion 50 is desirably arranged at a position separated from the leg elastic member 45 by a predetermined distance in the horizontal direction. . In FIG. 7, assuming that the distance in the left-right direction between the left-right end 10es of the absorbent main body 10 and the left-right end 30es of the back waistline portion 30 is WS30, the distance from the left-right end 10es of the absorbent main body 10 is WS30. A hole 50L is provided at a position separated by 1/2 or more of WS30. By disposing the hole portion 50L away from the leg elastic member 45 by a predetermined distance (WS30×1/2) or more, the stretchability of the leg elastic member 45 is less likely to act up to the position of the hole portion 50L. The portion 50L is less likely to shrink in the vertical direction, making it easier to suppress deterioration of visibility. This makes it easier for the user to recognize that the rear non-overlapping region 30NL has good air permeability.

Further, in the rear waist portion 30 of the diaper 1, the number per unit area of the holes 50 provided in the rear non-overlapping region 30NL that does not overlap the front waist portion 20 in the front-rear direction is the front side in the front-rear direction. It is less than the number per unit area of the holes 50 provided in the region overlapping the waist portion 20 (the rear overlapping region 30L). That is, in the rear waist portion 30, the hole density in the rear non-overlapping region 30NL is lower than the hole density in the rear overlapping region 30L.

Since the rear non-overlapping region 30NL (buttock cover) is not superimposed with other sheet members in the front-rear direction (sheet members are not laminated), the strength tends to be lower than that of the rear overlapping region 30L. When the diaper 1 is put on, there is a risk that the fingers of the user (the wearer or the person who makes the wearer wear it) may be caught and the diaper 1 may be torn. Therefore, by setting the hole density in the rear non-overlapping region 30NL to be lower than that in the rear overlapping region 30L, excessive reduction in strength can be suppressed and the rear non-overlapping region 30NL can be made difficult to tear. In addition, since the hole density is low, the holes 50 are easily conspicuous in the rear non-overlapping region 30NL, making it easier for the user to recognize good breathability.

===Other Embodiments===
Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. Further, the present invention can be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof. For example, the following modifications are possible.

In the above-described embodiment, the hole portions 50 are formed in both the front waist portion 20 and the rear waist portion 30, but the present invention is not limited to this. For example, the holes 50 may be formed only in either the front waist portion 20 or the rear waist portion 30 . However, by forming the holes 50 in both the front waistline portion 20 and the rear waistline portion 30, the breathability of the diaper 1 can be further improved.

Although the circular holes 50 are provided in the front waist portion 20 and the rear waist portion 30 in the above-described embodiment, the present invention is not limited to this. For example, through-holes of arbitrary shapes such as rectangular, elliptical, and star-shaped may be provided. Furthermore, the hole portions 50 having different shapes or sizes may be provided in the front waist portion 20 and the rear waist portion 30 .

Although the diaper 1 according to the above embodiment is intended for use by infants, it is not limited to this, and may be intended for use by adults. In addition, in the above-described embodiment, the so-called three-piece type disposable diaper 1 is exemplified as an example of the absorbent article, but it is not limited to this. For example, a so-called two-piece disposable diaper in which the front waist portion 20 and the rear waist portion 30 are integrally formed, or a tape-type disposable diaper may be used.

1 diaper (absorbent article),
10 absorbent main body, 10es end (lateral direction),
11 absorber,
11c absorbent core, 11r core wrap sheet,
11f region, 11b region,
13 top sheet, 14 exterior sheet, 15 back sheet,
20 front girth,
20a side end (end), 20t front upper end,
21 skin-side sheet, 22 non-skin-side sheet, 22f folded portion,
24 sheet member, 25 elastic member, 26 elastic member, 28 elastic member,
30 rear waist part,
30a side end (end), 30es end (lateral direction), 30t rear upper end,
30L rear overlap region,
30NL posterior non-overlapping region, 30NLU posterior non-overlapping region,
31 skin-side sheet, 32 non-skin-side sheet, 32f folded part,
34 sheet member, 35 elastic member,
35a elastic member (first elastic member), 35b elastic member,
35c elastic member (second elastic member), 35d elastic member,
45 leg circumference leak-proof wall elastic member 46 leak-proof wall elastic member,
50 hole, 50L hole,
BH waist opening, LH leg opening,
LG leg gathers, LSG leg side gathers (three-dimensional gathers)

Claims (7)

having a vertical direction, a horizontal direction, and a front-back direction that intersect each other;
a front girth;
a rear girth;
an absorber;
an elastic member that expands and contracts in the lateral direction;
A pants-type diaper comprising a hole penetrating in the front-rear direction in at least one of the front waist portion and the rear waist portion,
At least one of the front waist portion and the rear waist portion has a skin side sheet and a non-skin side sheet provided on the non-skin side of the skin side sheet,
The skin-side sheet and the non-skin-side sheet are provided on the non-skin side of the absorber,
At least one hole is provided in a non-overlapping region in which the front waistline portion and the rear waistline portion do not overlap in the front-rear direction of the front waistline portion and the rear waistline portion,
The elastic member is provided between the skin-side sheet and the non-skin-side sheet above the absorber in the vertical direction,
The rear waist portion,
a rear overlap region overlapped with the front waist portion in the front-rear direction;
The front waist portion and a rear non-overlapping region that are not overlapped in the front-rear direction,
The front waist portion and the rear waist portion are joined to each other at both ends in the left-right direction, and the rear non-overlapping region protrudes downward from the lowermost ends of the joined both ends. is provided in the
At least one hole is provided in each of the rear overlapping region and the rear non-overlapping region,
The number of holes provided per unit area in the rear non-overlapping region is smaller than the number of holes provided per unit area in the rear overlapping region. Pants diaper . having a vertical direction, a horizontal direction, and a front-back direction that intersect each other;
a front girth;
a rear girth;
an absorber;
a top sheet covering the absorbent body from the skin side;
an elastic member that expands and contracts in the lateral direction;
A pants-type diaper comprising a hole penetrating in the front-rear direction in at least one of the front waist portion and the rear waist portion,
a sheet member located closer to the skin than the top sheet,
At least one hole is provided in a non-overlapping region in which the front waistline portion and the rear waistline portion do not overlap in the front-rear direction of the front waistline portion and the rear waistline portion,
The elastic member is not provided between the top sheet and the sheet member above the absorber in the vertical direction,
The rear waist portion,
a rear overlap region overlapped with the front waist portion in the front-rear direction;
The front waist portion and a rear non-overlapping region that are not overlapped in the front-rear direction,
The front waist portion and the rear waist portion are joined to each other at both ends in the left-right direction, and the rear non-overlapping region protrudes downward from the lowermost ends of the joined both ends. is provided in the
At least one hole is provided in each of the rear overlapping region and the rear non-overlapping region,
The number of holes provided per unit area in the rear non-overlapping region is smaller than the number of holes provided per unit area in the rear overlapping region. Pants diaper . The pants-type diaper according to claim 1 or 2 ,
The rear waist portion includes an elastic member that expands and contracts in the left-right direction ,
The distance between the first lower end elastic member located at the bottom in the rear non-overlapping region and the elastic member adjacent to the upper side of the first lower end elastic member is
A pants-type diaper , wherein the space between a second lower end elastic member located on the lowest side in the rear side overlap region and the elastic member adjacent to the upper side of the second lower end elastic member is larger than a space between the second lower end elastic member and the elastic member. The pants-type diaper according to claim 3 ,
A pull-on diaper , wherein the tension of the first bottom elastic member is smaller than the tension of the second bottom elastic member. The pants-type diaper according to claim 3 or 4 ,
A pants-type diaper , wherein at least one hole is provided below the first lower end elastic member in the rear non-overlapping region in the vertical direction. The pants-type diaper according to any one of claims 1 to 5 ,
Equipped with a liquid-absorbing absorbent body,
A front upper end portion of the absorbent main body is joined to the front waist portion, and a rear upper end portion of the absorbent main body is joined to the rear waist portion,
Leg elastic members extending and contracting along the vertical direction are provided at both ends of the absorbent main body in the horizontal direction,
At least one hole is provided in a region of the rear non-overlapping region that does not overlap in the up-down direction with a range in which stretchability is exhibited by the leg elastic members. Pants diaper . The pants-type diaper according to any one of claims 1 to 6 ,
Equipped with a liquid-absorbing absorbent body,
A front upper end portion of the absorbent main body is joined to the front waist portion, and a rear upper end portion of the absorbent main body is joined to the rear waist portion,
Leg elastic members extending and contracting along the vertical direction are provided at both ends of the absorbent main body in the horizontal direction,
Among the rear non-overlapping regions, in the region that overlaps with the range in which elasticity is exhibited by the leg elastic member in the vertical direction,
From one end of the absorbent main body in the lateral direction,
At least one hole is provided at a position separated by 1/2 or more of the distance between one end of the absorbent main body and one end of the back waistline portion in the left-right direction, A pants-type diaper characterized by:

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