JP2020195549A - Absorbent article - Google Patents

Abstract

To provide an absorbent article whose air-permeability is more excellent than conventional.SOLUTION: An absorbent article includes: a first contraction part which includes a first elastic member provided for a first area approximate to a waist opening end edge forming a waist opening part capable of inserting a wearer's waist part of a front body area and a back body area and extended along a waist direction, and contracts the waist opening part in the waist direction; and a second contraction part which includes a second elastic member provided for a second area adjacent to a crotch area side with respect to the first area of the front body area and the back body area and extended along the waist direction, and contracts the waist opening in the waist direction. A longitudinal direction end part of the absorber and the first contraction part are in contact with each other.SELECTED DRAWING: Figure 9

Description

The present invention relates to absorbent articles.

Absorbent articles such as disposable diapers, urine pads, and sanitary napkins are provided with an absorber that absorbs excrement such as urine and body fluids. As an absorber of this type, for example, pulp, a super absorbent polymer (SAP), or the like is used.

Then, when the absorbent article is worn, moisture generated from urine, body fluid, etc. absorbed by the absorber is transferred to the internal space of the absorbent article (between the wearer's skin and the skin contact surface of the absorbent article). It tends to stay in the formed space), and this moisture causes skin troubles such as skin irritation, and also causes discomfort such as stuffiness and stickiness, which is not preferable.

Therefore, various proposals have been made to improve the air permeability of the absorbent article in order to discharge the moisture staying in the internal space of the absorbent article to the outside when the absorbent article is worn (for example, Patent Document). See 1st magnitude). For example, a disposable diaper is known in which an outer layer sheet and an inner layer sheet are contracted in the waist circumferential direction by an elastic member to form folds around the waist, and moisture is discharged to the outside through a gap between the folds and the wearer's skin. ing.

Japanese Patent No. 5761179

As described above, various proposals have been made to improve the air permeability of the absorbent article, but the actual situation is that the provision of the absorbent article having higher air permeability is desired. Therefore, one of the objects of the present invention is to provide an absorbent article having better air permeability than the conventional one.

In order to solve the above problems, the absorbent article according to the present invention is provided between the front body region covering the wearer's abdomen, the back body region covering the wearer's back, and the front body region and the back body region. It is an absorbent article in which an inseam region where an absorber is located and an absorber is arranged is continuously provided, and forms a torso opening through which the wearer's torso can be inserted between the front body region and the back body region. A first contraction portion that includes a first telescopic member provided in a first region close to the edge of the body opening and extending along the waist circumference direction, and contracts the body opening in the waist circumference direction, and the front body. Of the region and the back body region, the trunk opening includes a second elastic member provided in a second region adjacent to the inseam region side with respect to the first region and extending along the waist circumference direction. A second contraction portion that contracts the portion in the waist circumference direction is provided, and the first expansion / contraction member is adhered to a sheet member forming the first contraction portion, and the first contraction portion has a plurality of said parts. The first telescopic members are arranged at regular intervals, the distance between the first telescopic members is 6.5 mm or more and 20 mm or less, and the first contraction portion is the front body region and the back body region. The range from the end edge of the body opening extending in the longitudinal direction is 26 mm or more and 31 mm or less, and a plurality of the second telescopic members are arranged in the second contracted portion, and the second elastic member is arranged. The distance between the elastic members is set to be smaller than the distance between the first elastic members, and the longitudinal end portion of the absorber and the first contraction portion may be in contact with each other.

Here, the second contracted portion may be more rigid and soft than the first contracted portion.

Further, in order to solve the above problems, the absorbent article according to the present invention includes a front body region covering the wearer's abdomen, a back body region covering the wearer's back, and the front body region and the back body region. An absorbent article in which an inseam region located between them and an absorber is arranged is continuously provided, and a torso opening through which the wearer's torso can be inserted is provided in the front body region and the back body region. A first contraction portion that includes a first telescopic member provided in a first region close to the edge of the body opening to be formed and extending along the waist circumference direction, and contracts the body opening portion in the waist circumference direction, and the above. Among the front body region and the back body region, the second elastic member provided in the second region adjacent to the inseam region side with respect to the first region and extended along the waist circumference direction is included. A second contraction portion that contracts the body opening in the waist circumference direction and a skin-side sheet member that is laminated on the absorber to form a skin-facing surface are provided, and the first expansion / contraction member is the first contraction portion. A plurality of the first elastic members are arranged at regular intervals in the first contraction portion, and the interval between the first elastic members is 6.5 mm. The range from the trunk opening end edge extending in the longitudinal direction connecting the front body region and the back body region is 26 mm or more and 31 mm or less, and the second contraction portion is 20 mm or more. A plurality of the second telescopic members are arranged in the body, and the distance between the second telescopic members is set to be smaller than the distance between the first elastic members, and when worn. In the above, a space may be formed between the skin-side seat member and the wearer's skin in a region overlapping the vicinity of the longitudinal end of the absorber.

Here, a bending line that becomes convex toward the longitudinal end portion may be formed in the absorber in a region that overlaps with the vicinity of the longitudinal end portion of the absorber when viewed in a plan view.

Further, when viewed in a plan view, a bending line that becomes convex toward the longitudinal end portion of the absorber may be formed on the skin side sheet member in the vicinity of the longitudinal end portion.

Further, the distance between the first telescopic members may be 6.5 mm or more and 13 mm or less.

Further, the first contracted portion may have a laminated structure in which sheet members are laminated in at least three layers.

With the above-mentioned absorbent article, it is possible to obtain better air permeability than before.

FIG. 1 is a perspective view of a pants-type disposable diaper according to the first embodiment. FIG. 2 is an exploded perspective view of the diaper according to the first embodiment. FIG. 3 is a diagram schematically showing a state in which the diaper according to the first embodiment is unfolded. FIG. 4 is a diagram illustrating an installation mode of the diaper ventilation path forming sheet according to the first embodiment. FIG. 5 is a diagram schematically showing a state in which the diaper according to the comparative example is unfolded. FIG. 6 is a diagram for explaining the distance between the first rubber threads of the diaper according to the comparative example and the folds formed in the first contracted portion. FIG. 7A is a diagram illustrating folds in the first contracted portion of the waist gather according to the first embodiment. FIG. 7B is a diagram for explaining the folds in the first contracted portion of the waist gather according to the comparative example. FIG. 8 is a diagram illustrating a wind speed measurement position in the air permeability quantitative test. FIG. 9 is a diagram schematically showing a state in which the diaper according to the second embodiment is unfolded. FIG. 10 is a diagram schematically showing a state in which the diaper according to the third embodiment is unfolded.

Hereinafter, embodiments of the present invention will be described. The embodiments shown below are examples of embodiments of the present invention, and the technical scope of the present invention is not limited to the following embodiments.

<Embodiment 1>
FIG. 1 is a perspective view of a pants-type disposable diaper (hereinafter, simply referred to as “diaper”) 1 according to the first embodiment. FIG. 2 is an exploded perspective view of the diaper 1 according to the first embodiment. Further, FIG. 3 is a diagram schematically showing a state in which the diaper 1 according to the first embodiment is unfolded. FIG. 3A schematically shows the internal structure of the diaper 1 when unfolded when viewed from the left side. FIG. 3B schematically shows the planar structure of the diaper 1 when it is unfolded.

As used herein, the term "direction" means a direction that coincides with the front, back, left, and right of the wearer when the diaper 1 is worn by the wearer. For example, the term "left-right direction" as used herein means a direction that coincides with the left-right direction of the wearer of the diaper 1 when worn.

Further, in the present specification, the "front body area" of the diaper 1 means a portion that covers the wearer's abdomen (front of the body) when the diaper 1 is worn by the wearer. The "inseam area" of the diaper 1 means a portion that covers the inseam of the wearer when the diaper 1 is worn on the wearer. The "back body area" of the diaper 1 means a portion that covers the back (rear body) of the wearer when the diaper 1 is worn on the wearer. Further, in the present specification, the "longitudinal direction" means a direction connecting the front body region and the back body region of the diaper 1. That is, the longitudinal direction of the diaper 1 coincides with the continuous connection direction in which the front body region, the inseam region, and the back body region are continuously provided. Further, the "width direction" means a direction orthogonal to the longitudinal direction of the diaper 1.

In the present embodiment, as an example of the absorbent article, a pants-type disposable diaper having a tubular structure having an opening through which the wearer's abdominal circumference is inserted and a pair of left and right openings through which the wearer's left and right lower limbs are inserted. However, the “absorbent article” in the present specification is not limited to the pants-type disposable diaper. The "absorbent article" includes, for example, a tape fixed near one end of a sheet-shaped member that covers the wearer's inseam (genital area) from the front body region to the back body region, and the other end of the sheet-shaped member. It includes various forms of absorbent articles that can wrap the abdominal circumference and inseam, such as tape-type disposable diapers that form a tubular structure when attached near the part.

As shown in FIGS. 1 to 3, the diaper 1 has an inseam area 1B that covers the wearer's inseam (genital area), a front body area 1F that covers the wearer's abdomen, and a back body that covers the wearer's back. It has a region 1R. The inseam region 1B is located between the front body region 1F and the back body region 1R, and is connected to the front body region 1F and the back body region 1R. The inseam region 1B is an absorption unit that absorbs and holds a liquid. A main body 15 (absorber 8) is provided.

Since the diaper 1 in the present embodiment is a pants-type disposable diaper, the left edge of the front body region 1F and the left edge of the back body region 1R are joined to each other, and the right edge of the front body region 1F and the back body region 1R When the right edges are joined to each other, they are assembled in the state shown in FIG. As shown in FIG. 1, the body opening (waist opening) 2T is formed by the upper end edge of the front body region 1F and the upper end edge of the back body region 1R. Further, in the diaper 1, a left lower limb opening 2L is formed on the left side of the inseam region 1B to which the joint is not applied, and a right lower limb opening 2R is formed on the right side of the inseam region 1B. The left lower limb opening 2L and the right lower limb opening 2R are openings for inserting the wearer's leg when the diaper 1 is worn.

The diaper 1 is inserted so that the wearer's left lower limb is inserted through the left lower limb opening 2L, the wearer's right lower limb is inserted through the right lower limb opening 2R, and the wearer's body enters (passes) the body opening 2T. When worn, the front body area 1F is in contact with the wearer's abdomen, the back body area 1R is in contact with the wearer's back side, the inseam area 1B is applied to the wearer's crotch, and the left lower limb opening. 2L and the right lower limb opening 2R are fixed to the wearer's body in a state of surrounding the wearer's thigh. By fixing the diaper 1 to the wearer's body in this way, it is possible to walk while wearing the diaper 1.

In the diaper 1, an absorber 8 capable of absorbing and holding a liquid is mainly arranged around the inseam region 1B. Further, in the diaper 1, in order to suppress the formation of a gap serving as a liquid outflow route between the diaper 1 and the wearer's skin, the left lower limb opening 2L, the right lower limb opening 2R, and the torso opening A three-dimensional gather G1L, a three-dimensional gather G1R, and a waist gather G2 are provided in each of the portions 2T. The three-dimensional gathers G1L and G1R and the waist gather G2 are configured to be in close contact with the wearer's skin by the elastic force of the rubber thread, whereby the excrement liquid discharged from the wearer does not leak from the diaper 1. It can be absorbed by the absorbing unit main body 15 (absorbing body 8).

As shown in FIGS. 2 and 3, the diaper 1 has cover sheets 4F and 4R and a pad cover sheet 6 that form an outer surface when worn by the wearer. The cover sheet 4F is a sheet member that mainly forms the outer surface of the front body region 1F of the diaper 1. Further, the pad cover sheet 6 is a sheet member mainly for forming the outer surface of the inseam region 1B of the diaper 1. Further, the cover sheet 4R is a sheet member mainly for forming the outer surface of the back body region 1R of the diaper 1.

The cover sheets 4F and 4R and the pad cover sheet 6 are provided, for example, for reinforcing the outer surface of the diaper 1 and improving the feel. Further, the cover sheets 4F and 4R and the pad cover sheet 6 can be formed of, for example, a non-woven fabric made of a liquid-impermeable thermoplastic resin in order to suppress leakage of excrement. Here, examples of the liquid-impermeable thermoplastic resin include polyethylene (PE) and polypropylene (PP). Further, the liquid impermeable sheet may have a large number of fine pores of about 0.1 to several μm formed so as to exhibit liquid impermeableness and moisture permeability.

Further, the diaper 1 has an inner cover sheet 5F laminated on the skin facing surface side of the cover sheet 4F, and an inner cover sheet 5R laminated on the skin facing surface side of the cover sheet 4R. In the present specification, the “skin facing surface” means the surface facing the wearer's skin when the diaper 1 is worn by the wearer. As will be described in detail later, the inner cover sheet 5F is a sheet member that is attached to the cover sheet 4F with a thread rubber, which is a linear elastic member, sandwiched between the layers of the cover sheet 4F. The inner cover sheet 5F is a sheet member having a shape and size corresponding to a portion of the cover sheet 4F excluding the folded-back portion 4F5 and the waist first region RW1 in the exterior cover portion 4F10, which will be described later. Further, the inner cover sheet 5R is a sheet member that is attached to the cover sheet 4F with a thread rubber, which is a linear elastic member, sandwiched between the layers of the cover sheet 4R. The inner cover sheet 5R is a sheet member having a shape and size corresponding to a portion of the cover sheet 4R excluding the folded-back portion 4R5 and the waist first region RW1 of the exterior cover portion 4R10, which will be described later.

The diaper 1 of the present embodiment includes an absorption unit main body 15. The absorption unit main body 15 is held in a state of being bridged between the front body region 1F and the back body region 1R, and is arranged in the inseam of the wearer when the diaper 1 is worn, and liquids such as urine excreted by the wearer are collected. Absorb and hold. As shown in FIGS. 2 and 3, the absorption unit main body 15 includes a pad cover sheet 6, a back sheet 7, an absorber 8, a center sheet 9, side sheets 10L, 10R, and the like, and is integrally formed of these. ..

The back sheet 7, the absorber 8, and the center sheet 9 are laminated in this order on the skin-facing surface of the pad cover sheet 6. The pad cover sheet 6 has a length extending from the front body of the wearer to the back body via the inseam in the longitudinal direction, and has a rectangular plane having a predetermined width in the width direction orthogonal to the longitudinal direction. It is a sheet member to have. Further, the back sheet 7, the absorber 8, and the center sheet 9 are all sheet members having a rectangular plane like the pad cover sheet 6, and the pad cover is in a state where the longitudinal direction coincides with the longitudinal direction of the pad cover sheet 6. The sheets 6 are laminated in this order.

The absorber 8 is a member for absorbing a liquid such as urine and holding the absorbed liquid. The absorber 8 is arranged between the liquid-impermeable back sheet 7 and the liquid-permeable center sheet 9. The absorber 8 contains water in the gaps between short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, and short fibers obtained by hydrophilizing synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. It may have a structure in which granular absorbable resins such as a hydrophilic high-absorbent polymer having a crosslinked structure capable of absorbing and retaining the fibers are retained. As a result, when the absorber 8 absorbs the liquid excreted from the wearer, the absorbent resin held in the gaps in the short fibers can be swollen and the liquid can be held in the short fibers. The absorber 8 may have a single-layer structure composed of one mat, or may have a laminated structure in which a plurality of mats are laminated. Further, the absorber 8 can adopt an appropriate shape according to the purpose. Examples of the shape of the absorber 8 include a rectangular shape, an hourglass shape in which the vicinity of the central portion is constricted, and various other shapes.

The center sheet 9 is a sheet member for directly contacting the skin of the wearer's inseam and allowing a liquid such as urine to permeate through the absorber 8, and is laminated so as to cover the water absorption surface of the absorber 8. The center sheet 9 in this embodiment is made of a highly flexible liquid permeable material. Examples of the liquid permeable material forming the center sheet 9 include woven fabrics, non-woven fabrics, and porous films. Further, the center sheet 9 may have hydrophilicity.

The back sheet 7 is a sheet member for suppressing the liquid that has passed through the center sheet 9 and is absorbed by the absorber 8 from leaking to the outside of the diaper 1. Therefore, the back sheet 7 is made of a liquid-impermeable material. Examples of the liquid-impermeable material forming the back sheet 7 include a liquid-impermeable film made of polyethylene resin. Further, the back sheet 7 may be formed of a microporous polyethylene film in which a large number of micropores are formed in order to ensure air permeability.

The pad cover sheet 6 is a member for reinforcing the back sheet 7 and improving its feel, and is attached to the back sheet 7. Examples of the material for forming the pad cover sheet 6 include a woven fabric and a non-woven fabric. Further, the pad cover sheet 6 may be a non-woven fabric made of a thermoplastic resin such as polyethylene, polypropylene or polyester, or a wet non-woven fabric or the like.

The side sheets 10L and 10R in the absorbing portion main body 15 are elongated strip-shaped members for forming the three-dimensional gathers G1L and G1R described above. The side seats 10L and 10R extend along the long side portion of the center seat 9. Further, thread rubbers 10L1 and 10R1 are adhered to the side sheets 10L and 10R along the longitudinal direction. The left edge 4F7 of the cover sheet 4F forming the left edge of the front body region 1F and the left edge 4R7 of the cover sheet 4R forming the left edge of the back body region 1R are joined to each other, and the right edge of the front body region 1F is formed. When the right edge 4F8 of the cover sheet 4F to be formed and the right edge 4R8 of the cover sheet 4R forming the right edge of the back body region 1R are joined to each other to assemble the diaper 1 shown in FIG. 1, the side sheets 10L and 10R Is attracted in the longitudinal direction by the contraction force of the rubber threads 10L1 and 10R1, and as a result, rises from the center sheet 9 along the folding lines 10L2 and 10R2.

As a result, three-dimensional gathers G1L and G1R that prevent the outflow of liquid from the left lower limb opening 2L and the right lower limb opening 2R are formed. The method of joining the side edges of the cover sheets 4F and 4R is not particularly limited, and examples thereof include heat sealing, high frequency sealing, and ultrasonic sealing. The absorption unit main body 15 extends from the front body region 1F to the back body region 1R.

Next, the detailed structure of the diaper 1 will be described. As shown in FIG. 3, in the cover sheet 4F, the folded-back portion 4F5 is formed by folding back the tip side inward with the folded-back line 4F6 as a boundary. Hereinafter, the portion of the cover sheet 4F excluding the folded-back portion 4F5 will be referred to as an exterior cover portion 4F10. The exterior cover portion 4F10 of the cover sheet 4F forms the outer surface of the diaper 1. The folding line 4F6 of the cover sheet 4F forms the body opening edge 4F9 of the body opening 2T when the diaper 1 is assembled.

In the folded-back portion 4F5 of the cover sheet 4F, the first thread rubber 4F1 in the stretched state is arranged between the layers with the exterior cover portion 4F10. Further, the tip end side of the folded-back portion 4F5 of the cover sheet 4F is in a state in which one end side of the inner cover sheet 5F, the pad cover sheet 6, the back sheet 7, and the absorber 8 in the longitudinal direction is sandwiched between the layers of the outer cover sheet 5F and the exterior cover portion 4F10. Then, it is adhered to one end of the absorber 8 in a state of being overlapped with each other. It should be noted that, in the present specification, the mode in which one member and another member are expressed as overlapping is not limited to the mode in which the members overlap each other in a state of being in full contact with each other, and one member It is a concept including a mode in which a part of one member and a part of another member overlap each other, or a mode in which a part of one member and a part of another member overlap each other.

Further, as shown in FIG. 3, between the outer cover portion 4F10 and the inner cover sheet 5F on the cover sheet 4F, the second thread rubber 4F2, the third thread rubber 4F3, and the fourth thread rubber 4F4 are formed from the folding line 4F6 side. Are arranged in this order, and are bonded to each other in a state of being sandwiched between the outer cover portion 4F10 and the inner cover sheet 5F. As shown in FIG. 3, a plurality of first thread rubbers 4F1 to 4th thread rubbers 4F4 on the cover sheet 4F are arranged in parallel, and all of them are arranged along the width direction (girth direction) of the cover sheet 4F. Has been extended.

On the other hand, also for the cover sheet 4R, the folded-back portion 4R5 is formed by folding back the tip side inward with the folded-back line 4R6 as a boundary. Hereinafter, the portion of the cover sheet 4R excluding the folded-back portion 4R5 is referred to as an exterior cover portion 4R10. The exterior cover portion 4R10 of the cover sheet 4R forms the outer surface of the diaper 1. The folding line 4R6 of the cover sheet 4R forms the body opening edge 4R9 of the body opening 2T when the diaper 1 is assembled. The folded-back portion 4R5 of the cover sheet 4R has a first-thread rubber 4R1 in an elongated state arranged between the folded-back portion 4R5 and the exterior cover portion 4R10. Further, on the tip end side of the folded-back portion 4R5 of the cover sheet 4R, the other end side of the inner cover sheet 5R, the pad cover sheet 6, the back sheet 7, and the absorber 8 in the longitudinal direction is sandwiched between the layers of the outer cover sheet 5R and the outer cover portion 4R10. In this state, it is adhered to the other end of the absorber 8 in a state of being overlapped.

Further, as shown in FIG. 3, between the outer cover portion 4R10 and the inner cover sheet 5R in the cover sheet 4R, the second thread rubber 4R2, the third thread rubber 4F3, and the fourth thread rubber 4R4 are formed from the folding line 4R6 side. Are arranged in this order, and are bonded to each other in a state of being sandwiched between the outer cover portion 4R10 and the inner cover sheet 5R. As shown in FIG. 3, a plurality of first thread rubbers 4R1 to 4th thread rubbers 4R4 in the cover sheet 4R are arranged in parallel, and all of them are arranged along the width direction (circumferential direction) of the cover sheet 4R. Has been extended.

Hereinafter, in the cover sheets 4F and 4R of the diaper 1, the areas where the first thread rubbers 4F1 and 4R1 and the second thread rubbers 4F2 and 4R2 are arranged are referred to as "waist area RW". The waist region RW of the diaper 1 is located near the trunk opening edge edges 4F9 and 4R9 forming the trunk opening 2T, and is a region where the waist gather G2 is formed. Further, in the waist area RW, the area where the first thread rubbers 4F1 and 4R1 are arranged is called "waist first area RW1" (first area), and the area where the second thread rubbers 4F2 and 4R2 are arranged is called. Is called "waist second region RW2" (second region).

Further, in the cover sheets 4F and 4R of the diaper 1, the areas where the third thread rubbers 4F3 and 4R3 and the fourth thread rubbers 4F4 and 4R4 are arranged are referred to as "tammy area RT". The Tammy region RT is a region located below the waist region RW. Of the Tammy area RT, the area where the third thread rubber 4F3, 4R3 is arranged is called "Tammy first area RT1", and the area where the fourth thread rubber 4F4, 4R4 is arranged is "Tammy second area RT2". Is called.

Here, the first thread rubbers 4F1, 4R1 in the waist first region RW1 are, for example, in the process of assembling the diaper 1, after the adhesive is applied in a stretched state, the exterior cover portions 4F10, 4R10 and the folded portions 4F5, By being sandwiched between 4R5, it is adhered between these layers. Similarly, the second thread rubber 4F2, 4R2 in the waist second region RW2, the third thread rubber 4F3, 4R3 and the fourth thread rubber 4F4, 4R4 in the Tammy region RT were stretched, for example, in the process of assembling the diaper 1. After the adhesive is applied in this state, it is sandwiched between the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R of the cover sheets 4F, 4R to be adhered between these layers.

Here, the first thread rubbers 4F1, 4R1 of the waist first region RW1 sandwiched and adhered between the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R in the cover sheets 4F, 4R in an elongated state are contracted. Then, following that, of the exterior cover portions 4F10, 4R10 and the folded portions 4F5, 4R5, the portion corresponding to the waist first region RW1 is continuously bent in a fold shape, so that the waist first region RW1 is bent in the waist circumference direction. The first contracted portion S1 to be contracted is formed.

Also in the waist second region RW2, when the second thread rubber 4F2, 4R2 that is sandwiched and adhered between the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R in an elongated state contracts, the exterior is followed accordingly. Of the cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R, the portion corresponding to the waist second region RW2 is continuously bent in a fold shape, so that the waist second region RW2 is contracted in the waist circumference direction. Part S2 is formed.

In the present embodiment, the waist gather G2 is formed mainly by the first contraction portion S1 formed in the waist first region RW1 and the second contraction portion S2 formed in the waist second region RW2. The waist gather G2 improves the fit of the diaper 1 around the wearer's waist by the contraction force of the first thread rubber 4F1, 4R1 and the second thread rubber 4F2, 4R2. In the first contraction portion S1 of the waist gather G2, three first thread rubbers 4F1 and 4R1 are arranged in parallel with each other and at regular intervals A1. Further, in the second contracted portion S2 of the waist gather G2, a plurality of second thread rubbers 4F2 and 4R2 are parallel to each other and at a constant interval A.
It is provided with 2 open. In the present embodiment, the distance A1 between the first thread rubbers 4F1 and 4R1 in the first shrinkage portion S1 is set to be larger than the distance A2 between the second thread rubbers 4F2 and 4R2 in the second shrinkage portion S2. The first contraction portion S1 guarantees a moisture discharge function for discharging the moisture in the internal space of the diaper 1 to the outside and a function for facilitating the expansion of the body opening 2T. On the other hand, the second contraction portion S2 of the waist gather G2 has a position holding function (suppression of slippage) that suppresses slippage when the diaper 1 is worn by increasing the contraction force in the waist circumference direction as compared with the first contraction portion S1. Function) is guaranteed. The distance between the rubber threads here means a dimension in which adjacent rubber threads are separated from each other in the longitudinal direction of the diaper (the direction connecting the front body region and the back body region).

Further, in the present embodiment, the first thread rubbers 4F1, 4R1 of the waist first region RW1 and the second thread rubbers 4F2, 4R2 of the waist second region RW2 extend over the entire width section of the cover sheets 4F, 4R. ing. Therefore, after the diaper 1 is completed, the first thread rubber 4F1, 4R1 and the second thread rubber 4F2, 4R2 form a substantially annular elastic member that circulates along the body opening 2T. In other words, after the diaper 1 is completed, waist gathers G2 (first contracted portion S1, second contracted portion S2) are formed over the entire circumference in the waist circumference direction.

Also in the Tammy first region RT1, when the third thread rubbers 4F3, 4R3 that are sandwiched and adhered in an extended state between the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R in the cover sheets 4F, 4R shrink. Following this, of the exterior cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R of the cover sheets 4F, 4R, the portion corresponding to the Tammy first region RT1 is continuously bent in a fold shape, so that the Tammy first A third contracted portion S3 that contracts the one region RT1 in the waist circumference direction is formed. The third contracted portion S3 is a region that fits in the vicinity of the height of the wearer's hip bone when the diaper 1 is worn. In the present embodiment, the contraction force (hereinafter, also referred to as “widening strength”) of the third contraction portion S3 is smaller than that of the second contraction portion S2 that secures the position holding function (slip-off suppressing function), so that the wearing It is good not to give a person an excessive feeling of oppression.

Further, also in the Tammy second region RT2, the fourth thread rubbers 4F4, 4R4 which are sandwiched and adhered in an extended state between the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R in the cover sheets 4F, 4R are formed. When it contracts, the parts corresponding to the Tammy second region RT2 of the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R of the cover sheets 4F and 4R flex continuously in a fold shape. A fourth contracted portion S4 that contracts the Tammy second region RT2 in the waist circumference direction is formed. In the present embodiment, the Tammy gather G3 is formed mainly by the third contraction portion S3 formed in the Tammy first region RT1 and the fourth contraction portion S4 formed in the Tammy second region RT2. The Tammy Gather G3 improves the fit of the diaper 1 around the lower abdomen of the wearer, for example, by the contraction force of the third thread rubber 4F3, 4R3 and the fourth thread rubber 4F4, 4R4.

Further, in the present embodiment, in order to form the first contraction portion S1 to the fourth contraction portion S4, the rubber threads 4F1, 4R1, 4F2, 4R2, 4F3, 4R3, 4F4, 4R4 are covered with the cover sheets 4F, 4R. Although it extends along the width direction (girth direction), it is not limited to the rubber thread as long as it is a linear elastic member, and other materials and forms may be used. Further, in the present specification, the term "linear" represents an elongated form extending in a specific direction, and is a concept including a strip-shaped or strip-shaped shape. Examples of the material of the thread rubber include natural rubber and synthetic rubber, but the material is not limited to a specific material.

Next, the ventilation path forming sheets 11F and 11R of the diaper 1 will be described. As shown in FIGS. 2 and 3, the diaper 1 straddles the folded-back portions 4F5 and 4R5 of the cover sheets 4F and 4R, and the longitudinal end regions of the pad cover sheet 6 and the center sheet 9 of the absorbing portion main body 15. The folded portions 4F5, 4R5 and the pad cover sheet 6 are provided with the ventilation path forming sheets 11F, 11R laminated on the skin. The ventilation path forming sheets 11F and 11R form the skin contact surface in the waist gather G2 of the diaper 1. The “skin contact surface” means a surface that directly contacts the wearer's skin when the diaper 1 is worn, that is, the innermost surface of the diaper 1.

FIG. 4 is a diagram illustrating an installation mode of the ventilation passage forming sheets 11F and 11R of the diaper 1 according to the present embodiment. FIG. 4A is a diagram showing a state in which the first contracted portion S1 of the waist gather G2 is viewed from the internal space side of the diaper 1. Further, FIG. 4B is a diagram schematically showing the internal structure of the waist gather G2 in the first contracted portion S1 when viewed from the side of the diaper 1. Further, FIG. 4C is a diagram showing a state in which the first contracted portion S1 of the waist gather G2 is viewed from above the diaper 1 (that is, the direction in which the arrow A is viewed in FIG. 4B). (A) and (C) of FIG. 4 show the state before the first contraction portion S1 in the waist gather G2 contracts for convenience. Further, FIG. 4D is a diagram showing a state in which the first contracted portion S1 of the waist gather G2 after contraction is viewed from above.

The ventilation path forming sheets 11F and 11R are laminated and arranged so as to cover at least a part of the folded-back portions 4F5 and 4R5 forming the skin facing surface in the first contraction portion S1 of the waist first region RW1 and are indicated by reference numerals S. It is joined to the end region in the longitudinal direction and the folded-back portions 4F5, 4R5 of the pad cover sheet 6 through the joint portion. In the present embodiment, the folded portions 4F5, 4R5 of the cover sheets 4F and 4R formed of the thermoplastic resin and the ventilation path forming sheets 11F and 11R overlapped with the pad cover sheet 6 are joined by ultrasonic welding. It forms a part S. As shown in FIG. 4A, a plurality of joints S are intermittently arranged along the longitudinal direction orthogonal to the waist circumference direction (width direction) from the body opening edge 4F9, 4R9 of the cover sheets 4F, 4R. As a result, a linear joint SL extending in the longitudinal direction of the diaper 1 is formed. In other words, one linear joint SL is formed as an aggregate of a plurality of joints S intermittently arranged along the longitudinal direction of the diaper 1. Here, the term "intermittently arranged" means a mode in which the arrangement is discontinuous or intermittent.

As shown in FIG. 4A, a plurality of linear joints SL are intermittently formed in the first contracted portion S1 of the waist gather G2 along the waist circumference direction (width direction) of the cover sheets 4F and 4R. Have been placed. In the example shown in FIG. 4A, the linear joints SL are provided in parallel with each other, and the distances between the linear joints SL are set to alternate between large and small. That is, the linear joint SLs are intermittently arranged so that the double wires formed by the set of linear joints SL are arranged at equal intervals in the waist circumference direction (width direction). Note that FIG. 3A shows the range in which the linear joint SL extends in the longitudinal direction of the diaper 1 by hatching. As shown, the linear joint SL extends over the waist first region RW1 where the first contraction portion S1 is formed and the waist second region RW2 where the second contraction portion S2 is formed.

Ultrasonic bonding of the ventilation path forming sheets 11F and 11R to the folded-back portions 4F5, 4R5 and the like is performed in a state where the first thread rubbers 4F1, 4R1 and the second thread rubbers 4F2, 4R2 of the waist gather G2 are in an elongated state. Then, after the ventilation path forming sheets 11F and 11R are joined to the folded-back portions 4F5, 4R5 and the like, the stretched states of the first thread rubbers 4F1, 4R1 and the second thread rubbers 4F2, 4R2 sandwiched and fixed between the sheet layers are exhibited. It will be released. As a result, the waist gather G2 contracts, so that the distance between the linear joints SL in the ventilation path forming sheets 11F and 11R is narrowed. As a result, of the ventilation path forming sheets 11F and 11R, the non-joining region 110 located between the linear joining portions SL bends and is deformed into a corrugated shape.

As a result, the folded-back portions 4F5, 4R5 of the cover sheets 4F and 4R and the non-joined regions 110 in the ventilation path forming sheets 11F and 11R are separated from each other, so that the folded-back portions 4F5 and 4R5 are separated from each other as shown in FIG. The first air passage 111 surrounded by the non-joint region 110 of the air passage forming sheets 11F and 11R is formed. Further, the second ventilation path 112 can be formed on the skin contact surface 11a side of the ventilation path forming sheets 11F and 11R. The symbol SS indicated by the alternate long and short dash line in FIG. 4D indicates the skin surface in contact with the ventilation path forming sheets 11F and 11R as a virtual line when the diaper 1 is worn by the wearer. The second ventilation passage 112 is formed as a gap formed between the skin contact surface 11a of the ventilation passage forming sheets 11F and 11R and the wearer's skin when the diaper 1 is worn by the wearer. Moisture in the internal space of the diaper 1 can be discharged to the outside through the first air passage 111 and the second air passage 112 formed in the waist gather G2. The first ventilation passage 111 is a ventilation passage through which moisture permeates through the ventilation passage forming sheets 11F and 11R from the internal space of the diaper 1. On the other hand, the second ventilation path 112 is a ventilation path that directly communicates between the internal space and the external space of the diaper 1, and the moisture in the diaper 1 can be discharged more smoothly.

As shown in FIG. 4D, after the waist gather G2 is contracted, the relatively large first fold 41 forming the first contracted portion S1 and the relatively small second fold 42 are formed. It is formed alternately. Further, in the ventilation path forming sheets 11F and 11R which are bent and deformed in a corrugated manner, relatively large first folds 113 and relatively small second folds 114 are alternately formed. This is because the intervals between the linear joints SL are set so as to alternate between large and small. That is, a set of wide-spaced linear joints SL forms large first folds 41 and 113, and a set of narrowly-spaced linear joints SL forms small second folds 42 and 114.

Here, the first folds 113 of the ventilation path forming sheets 11F and 11R that are bent and deformed in a corrugated manner cooperate with the first folds 41 that form the first contraction portion S1 to secure a large first ventilation path 111. Contribute. On the other hand, the second folds 114 of the ventilation passage forming sheets 11F and 11R form the first ventilation passage 111 in cooperation with the second fold 42 forming the first contraction portion S1 and in the waist circumference direction (width direction). The adjacent first folds 113 are appropriately separated from each other, which contributes to secure the ventilation cross section of the second ventilation passage 112. In the present embodiment, the flute structure formed by the air passage forming sheets 11F and 11R that follow the contraction of the first contracted portion S1 and deform into a wave shape is provided on the skin contact surface side of the waist gather G2. Moisture in the diaper 1 can be efficiently discharged to the outside through the 1 ventilation passage 111 and the 2nd ventilation passage 112. Further, in the present embodiment, since the linear joint SL is formed as an aggregate of a plurality of joints S intermittently arranged along the longitudinal direction of the diaper 1, there is a gap between the joints S. Through, the adjacent first ventilation passages 111 are communicated with each other. Therefore, it is possible to improve the air permeability between the adjacent first ventilation passages 111 and make it difficult for the wearer to feel a local stuffiness.

Further, the ventilation path forming sheets 11F and 11R in the present embodiment are provided with a large number of fine ventilation holes 11F1 and 11R1 for ventilation. Here, the ventilation hole means an opening that communicates the space on the side of one surface of the sheet and the space on the side of the other surface, and the shape thereof is not particularly limited. Therefore, as the ventilation holes 11F1, 11R1, for example, openings having a shape such as a circle, an ellipse, or a polygon (triangle, quadrangle, etc.) can be applied. The formation of the ventilation holes 11F1, 11R1 in the ventilation passage forming sheets 11F, 11R does not mean that the ventilation passage forming sheets 11F, 11R are made of a non-breathable material, and the ventilation passage forming sheets 11F, 11R may be either a breathable material or a non-breathable material. The ventilation path forming sheets 11F and 11R are preferably made of a material having breathability or liquid permeability, but may be, for example, a non-breathable material. The size and number of the ventilation holes 11F1 and 11R1 are not particularly limited, but for example, if the opening area is 0.5 to 10 mm ² , it is preferable that about 5 to 200 holes are formed.

As described above, the diaper 1 according to the present embodiment has the first contraction portion S1 located on the body opening 2T side of the waist gather G2 secures the moisture discharge function, and the position holding function of the diaper 1 (
The installation mode of the first thread rubbers 4F1, 4R1 (first elastic member) arranged in the first contraction portion S1 and the second contraction portion in order to secure the slip-off suppressing function) to the second contraction portion S2. The installation mode of the second thread rubber 4F2, 4R2 (second elastic member) arranged in S2 is made different. That is, by setting the distance A1 between the first thread rubbers 4F1 and 4R1 in the first shrinkage portion S1 to be larger than the distance A2 between the second thread rubbers 4F2 and 4R2 in the second shrinkage portion S2, the first shrinkage portion The moisture discharge function in S1 and the slip-off suppressing function in the second contraction portion S2 are compatible with each other.

As a result of diligent studies, the present inventors have arranged the first thread rubbers 4F1 and 4R1 forming the first contraction portion S1 at regular intervals, and set the interval A1 to 6.5 mm or more and 20 mm or less. It has been found that the breathability and ease of attachment / detachment of the waist gather G2 in the diaper 1 can be improved by setting the diaper 1, and in particular, setting the interval A1 to 6.5 mm or more and 13 mm or less is the waist gather G2. It was found that it is even more preferable from the viewpoint of improving breathability and ease of attachment / detachment. Hereinafter, the action and effect of the diaper 1 according to the present embodiment will be described by comparing the diaper 1 according to the present embodiment with the diaper 101 according to the comparative example.

FIG. 5 is a diagram schematically showing a state in which the diaper 101 according to the comparative example is unfolded. FIG. 5A schematically shows the internal structure of the diaper 101 when unfolded when viewed from the left side. FIG. 5B schematically shows the planar structure of the diaper 101 when unfolded. The diaper 101 according to the comparative example is the same as the diaper 1 according to the present embodiment shown in FIG. 3 and the like, except that the number and spacing of the first rubber threads 4F1 and 4R1 are different. Therefore, in the diaper 101 shown in FIG. 5, the same reference numerals as those of the diaper 1 are given for the same configuration as that of the diaper 1, and detailed description thereof will be omitted.

As shown in FIG. 5, in the diaper 101 according to the comparative example, the first thread rubbers 4F1 and 4R1 extend in the left-right direction along the body opening end edges 4F9 and 4R9 of the cover sheets 4F and 4R, respectively. It is provided in. The first rubber threads 4F1 and 4R1 of the diaper 101 according to the comparative example are arranged in parallel with each other at a certain interval B1. Here, the distance B1 between the first thread rubbers 4F1, 4R1 of the diaper 101 according to the comparative example has a smaller size than the distance A1 between the first thread rubbers 4F1, 4R1 in the diaper 1 according to the present embodiment. It is set. For example, the distance B1 between the first thread rubbers 4F1 and 4R1 of the diaper 101 according to the comparative example is set to 5 mm.

Next, FIG. 6 is a diagram for explaining the folds formed in the interval B1 of the first thread rubbers 4F1 and 4R1 of the diaper 101 and the first contraction portion S1 according to the comparative example. (A) to (D) of FIG. 6 correspond to (A) to (D) of FIG. 4, respectively. FIG. 6A is a diagram showing a state in which the waist gather G2 (first contracted portion S1) in the waist first region RW1 of the diaper 101 of the comparative example is viewed from the internal space side of the diaper 101. Further, FIG. 6B is a diagram schematically showing the internal structure in the waist gather G2 (first contracted portion S1) in the waist first region RW1 when viewed from the side of the diaper 101. Further, FIG. 6C is a diagram showing a state in which the waist first region RW1 is viewed from above the diaper 101. (A) and (C) in FIG. 6 show the state before the waist gather G2 (first contracted portion S1) in the waist first region RW1 contracts for convenience. Further, FIG. 6D is a diagram showing a state in which the diaper 101 is viewed from above in a state in which the waist gather G2 (first contracted portion S1) is contracted.

As shown in (D) of FIG. 4 and (D) of FIG. 6, the first fold formed by contracting the first contraction portion S1 of the waist gather G2 by the contraction force of the first thread rubbers 4F1 and 4R1. The size of the 41st and the second folds 42 is larger in the diaper 1 according to the first embodiment than in the diaper 101 according to the comparative example. The reason is as follows.

FIG. 7A is a diagram illustrating folds in the first contracted portion S1 of the waist gather G2 according to the present embodiment. FIG. 7A (A) is a diagram schematically showing a state in which the folds in the first contracted portion S1 of the present embodiment are viewed from the front. FIG. 7A (B) is a diagram schematically showing a state in which the folds in the first contracted portion S1 of the present embodiment are viewed from the side. FIG. 7B is a diagram illustrating folds in the first contracted portion S1 of the waist gather G2 according to the comparative example. FIG. 7B (A) is a diagram schematically showing a state in which the folds in the first contracted portion S1 of the comparative example are viewed from the front. FIG. 7B (B) is a diagram schematically showing a state in which the folds in the first contracted portion S1 of the comparative example are viewed from the side.

Here, since the first thread rubbers 4F1, 4R1 provided in the first shrinkage portion S1 are adhered to the exterior cover portions 4F10, 4R10 and the folded portions 4F5, 4R5 of the cover sheets 4F, 4R, the first thread rubber 4F1 The first folds 41 and the second folds 42 of the cover sheets 4F and 4R formed between the 4R1s, and the first folds 113 and the second folds 114 of the ventilation path forming sheets 11F and 11R are the first thread rubber 4F1, The closer the distance from 4R1 is, the higher the degree of restraint by the first thread rubbers 4F1 and 4R1. On the other hand, the distance A1 between the first thread rubbers 4F1, 4R1 of the diaper 1 according to the present embodiment is wider than the distance B1 between the first thread rubbers 4F1, 4R1 of the diaper 101 according to the comparative example. Therefore, in the diaper 1 of the present embodiment, the first folds 41 and the second folds 42 of the cover sheets 4F and 4R, and the first folds 113 and the second folds 114 of the ventilation path forming sheets 11F and 11R are the diapers 101 of the comparative example. As a whole, it is less likely to receive the binding force of the first thread rubbers 4F1 and 4R1. As a result, the diaper 1 of the present embodiment has the first folds 41 and the second folds 42 of the cover sheets 4F and 4R, and the first folds 113 and 11R of the ventilation path forming sheets 11F and 11R, as compared with the diaper 101 of the comparative example. It is possible to increase the size of the two folds 114.

As described above, according to the diaper 1 according to the present embodiment, the sizes of the first folds 41 and the second folds 42 formed in the first contraction portion S1 of the waist gather G2 are larger than those of the diaper 101 according to the comparative example. Since the diaper can be increased, the ventilation area of the first ventilation passage 111 can be further increased. Further, according to the diaper 1 according to the present embodiment, the sizes of the first folds 113 and the second folds 114 formed on the ventilation path forming sheets 11F and 11R are made larger than those of the diaper 101 according to the comparative example. Can be done. As a result, the ventilation area of the first ventilation passage 111 and the second ventilation passage 112 can be further increased. From the above, according to the diaper 1 according to the present embodiment, the moisture in the diaper 1 can be discharged more smoothly.

Further, in the diaper 1 in the present embodiment, the diaper 1 is compressed from the outside when the wearer takes a sitting position from the standing position, and the diaper 1 is deformed by the movement of the legs when the wearer walks. As a result, the moisture in the diaper 1 can be discharged to the external space through the first ventilation passage 111 and the second ventilation passage 112, and the internal space of the diaper 1 can be made into a comfortable environment. As described above, the pump effect of promoting the discharge of moisture from the inside of the diaper due to the compressive deformation of the diaper 1 is as compared with the comparative example, the first folds 41 and the second folds 42 of the cover sheets 4F and 4R, and the ventilation path formation. The breathability of the waist gather G2 can be improved by combining with the installation mode of the first thread rubbers 4F1 and 4R1 in the first contraction portion S1 which contributes to increasing the first folds 113 and the second folds 114 of the sheets 11F and 11R. It is possible to obtain a synergistic effect that can be improved more remarkably.

Further, in the diaper 1 of the present embodiment, the first contraction portion S1 forming the waist gather G2 extends in the longitudinal direction connecting the front body region 1F and the back body region 1R, and extends from the body opening 2T. The length is set to 26 mm or more and 31 mm or less. According to this, when the body opening 2T is widened, the vicinity of the second joint of the finger is just caught on the body opening edge 4F9, 4R9, so that when the diaper 1 is put on or taken off by the wearer. There is an advantage that the body opening 2T can be easily widened. More specifically, when the body opening 2T is widened, if the part on the fingertip side of the first joint of the finger is located at the body opening edge 4F9, 4R9, the body opening is being widened during the body opening 2T. The fingertips tend to come off unexpectedly from the edge edges 4F9 and 4R9. On the other hand, when the torso opening 2T is widened, if the part on the base side of the finger deeper than the second joint is located at the torso opening edge 4F9, 4R9, the second contracted portion is located below the first contraction portion S1. 2 The contracted portion S2 expands, and it tends to be difficult to efficiently expand the body opening 2T. On the other hand, by setting the extending length of the first contracted portion S1 along the longitudinal direction of the diaper to 26 mm or more and 31 mm or less, the ease of putting on and taking off the diaper 1 can be improved. Further, when the diaper 1 is unfolded, the tips of the fingers do not bite into the ventilation path forming sheets 11F and 11R forming the skin contact surface of the waist gather G2 of the diaper 1, and the ventilation path forming sheets 11F and 11R are damaged. It also has the advantage of being able to suppress this.

Further, in the diaper 1 of the present embodiment, the first contracted portion S1 has a laminated structure in which sheet members are laminated in at least three layers. According to this, when the diaper 1 is put on by the baby (wearer), even if the operator's finger gets between the first thread rubbers 4F1 and 4R1 arranged in the first contraction portion S1. It is possible to prevent the cover sheets 4F and 4R forming the first contracted portion S1 from being torn.

Further, in the diaper 1 of the present embodiment, the distance A2 between the second rubber threads 4F2 and 4R2 in the second contraction portion S2 forming the waist gather G2 is set, and the distance between the first rubber threads 4F1 and 4R1 in the first contraction portion S1. Since the size is set to be smaller than that of A1, the second contraction portion S2 can suitably exert the slip-off suppressing function of suppressing the slip-off of the diaper 1. That is, the waist gather G2 as a whole can suitably suppress the slipping off of the diaper 1 while exhibiting the moisture discharging function of discharging the moisture in the internal space of the diaper 1 to the outside.

In the diaper 1 according to the present embodiment, the width dimension in which the second contracted portion S2 extends in the longitudinal direction of the diaper (the direction orthogonal to the waist circumference direction) is preferably 10 mm or more. By setting the extending width of the second contracted portion S2 as described above, it is possible to prevent the second contracted portion S2 from biting into the wearer's skin when the operator wears the diaper 1 on the wearer. It will be easier. Further, in the diaper 1 of the present embodiment, the extending width of the second contracted portion S2 in the diaper longitudinal direction is preferably 26 mm or less. By doing so, when the diaper 1 is worn, the navel of the wearer is less likely to be covered by the waist gather G2, so that there is an advantage that the wearer is less likely to receive an excessive feeling of oppression.

<Test result>
Hereinafter, a diaper corresponding to an example of the diaper 1 according to the first embodiment and a diaper corresponding to the diaper 101 according to the comparative example are prepared, and the air permeability quantitative test, the mist aeration test, and the widening strength are prepared for each diaper. Tests, etc. were conducted. Hereinafter, the diaper corresponding to one example of the diaper 1 according to the first embodiment will be referred to as an “example”, and the diaper corresponding to the diaper 101 of the above comparative example will be referred to as a “comparative example”.

[Ability quantitative test]
First, a breathability quantitative test for Examples and Comparative Examples will be described. FIG. 8 is a diagram illustrating a wind speed measurement position in the air permeability quantitative test. As a test condition, when a dummy diaper is attached to the diaper to be tested and 20 L / min of air is injected from the inseam of the dummy doll, the speed (wind speed) of the air discharged from the inside of the diaper to the outside is determined. It was measured with a wind speed measuring device. A commercially available hot wire anemometer (manufactured by Testo Co., Ltd., product number: testo425, wind speed resolution: 0.01 m / s) was used for the measurement of the wind speed.

Table 1 shows various specifications of Examples and Comparative Examples. As for the number of samples to be subjected to the test, three types of Big size, L size, and M size were prepared for each of Examples 1 to 3 and Comparative Examples 1 to 3, respectively. In each size of Examples and Comparative Examples, the types, numbers, and intervals of the first thread rubbers 4F1 and 4R1 forming the first contraction portion S1 in the waist gather G2 are shown in the table. As shown in Table 1, the specifications of Examples 1 to 3 and Comparative Examples 1 and 2 were such that the waist gather G2 was provided with a ventilation path forming sheet. On the other hand, in Comparative Example 3, the waist gather G2 is not provided with a ventilation path forming sheet.

Further, in the air permeability quantitative test, as shown in FIG. 8, at the center of the back body of the diaper in the width direction, the wind speed was measured at five locations A to E, which differed in the vertical distance from the end edge of the body opening. It was measured. The vertical direction referred to here is a direction orthogonal to the width direction along the outer surface of the diaper. The measurement position A was set to a position 1 cm above the edge of the opening of the body. Further, as shown in FIG. 8, the measurement positions B to E are located below the body opening edge, and the distances from the body opening edge are 0.5 cm, 1.5 cm, 2.5 cm, and 3. It was set to 5 cm.

Regarding the measurement positions B to E, the probe of the wind speed measuring device is held in a vertical posture with respect to the outer surface (cover sheet surface) of the diaper, and the wind speed is measured with the tip of the probe facing the outer surface of the diaper. Was carried out. On the other hand, at the measurement position A, the probe of the wind speed measuring device was held in a posture along the back of the dummy, and the tip of the probe was opposed to the gap between the back of the dummy and the waist gather of the diaper. The wind speed was measured in this state.

Table 2 shows the results of the air permeability quantitative test.

Regarding the measurement position A, it is considered that the flow of air leaking to the outside through the gap between the waist gather G2 and the skin of the dummy doll becomes dominant. Therefore, when the measurement results of the wind speed at the measurement position A are considered for each Example and each Comparative Example, as shown in Table 2, Example 1 (rubber spacing 6.5 mm) and Example 2 (thread rubber spacing 13 mm) ) And Example 3 (rubber spacing 20 mm), the wind speed is significantly increased as compared with Comparative Example 1 (rubber spacing 5 mm) and Comparative Example 3 (thread rubber spacing 5 mm, no vent passage forming sheet). Results were obtained. Therefore, it can be said that the air permeability of the waist gather G2 is significantly improved in Examples 1 to 3 as compared with Comparative Examples 1 and 3. Further, it can be evaluated that the air permeability of the waist gather G2 can be improved by ensuring the distance between the first thread rubbers 4F1 and 4R1 forming the first contraction portion S1 in the waist gather G2 of 6.5 mm or more. Regarding the measurement positions B to E, no significant difference was observed between each Example and each Comparative Example.

Here, Table 2 also shows the sensory evaluation results regarding the ease of attachment / detachment (easiness of attachment / detachment) of Examples and Comparative Examples. The sensory evaluation was evaluated by 5 evaluators. Of the five evaluators, those who answered that 4 or more were good were evaluated as ○, those that answered that 3 were good were evaluated as △, and those that answered that 2 or less were good were evaluated as ×. did. In Comparative Example 1 and Comparative Example 3 in which the distance between the rubber threads in the waist gather G2 was set to 5 mm, the shrinkage force of the rubber threads in the waist gather G2 was high, and the rubber threads in the waist gather G2 were stretched when the diaper was worn. Great power was needed. On the other hand, Examples 1 to 3 in which the distance between the rubber threads in the waist gather G2 is set in the range of 6.5 mm to 20 mm are described in Comparative Examples 1 and 3 when the rubber threads in the waist gather G2 are stretched when the diaper is worn. The result was that it did not require a large amount of force and was easy to pull up.

On the other hand, in Comparative Example 2 in which the thread rubber spacing in the waist gather G2 was set to 25 mm, the result was that the thread rubber spacing was too wide, so that the fingers did not get caught and it was difficult to pull up. From this, it can be said that the distance between the rubber threads of the waist gather G2 is preferably 20 mm or less from the viewpoint of ease of putting on and taking off the diaper. Further, in Comparative Example 2, the air permeability of Waist Gather G2 was almost the same as that of Examples 1 to 3, but Comparative Example 2 was inferior to Examples 1 to 3 in terms of ease of putting on and taking off the diaper. You can see that there is. From the above, comprehensively judging from the viewpoint of the breathability of the waist gather G2 and the ease of putting on and taking off the diaper, the distance between the first rubber threads 4F1 and 4R1 forming the first contraction portion S1 in the waist gather G2 is 6. It can be evaluated that it is preferable to set it to 5 mm or more and 20 mm or less.

Further, when comparing each example, the air permeability of the waist gather G2 is almost the same, but the ease of putting on and taking off the diaper is compared with that of Example 3 (thread rubber interval 20 mm) in Example 1 (thread rubber interval 6. The results were obtained that 5 mm) and Example 2 (rubber spacing 13 mm) were further superior. As a result, setting the distance between the first thread rubbers 4F1 and 4R1 forming the first contracted portion S1 in the waist gather G2 to 6.5 mm or more and 13 mm or less improves the air permeability and the ease of attachment / detachment of the waist gather G2. Therefore, it can be said that it is particularly preferable.

<Embodiment 2>
Next, the diaper according to the second embodiment will be described. The diaper 1 according to the present embodiment has the same components as the diaper according to the above-described first embodiment. In the present embodiment, the same configurations as those in the above-described first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 9 is a diagram schematically showing a stretched state of the diaper 1 according to the second embodiment. FIG. 9A schematically shows the internal structure of the unfolded and stretched diaper 1 when viewed from the left side. FIG. 9B schematically shows a plan view of the diaper 1 in the expanded and extended state.

In the diaper 1 according to the present embodiment, the longitudinal end portion of the absorber 8 and the first contracted portion S1 are in contact with each other. In other words, the longitudinal end of the absorber 8 extends to the end of the first contraction S1. As a result, the moisture from the absorber 8 that has absorbed the liquid through the first air passage 111 and the second air passage 112 formed by the contraction of the first contracted portion S1 can be efficiently discharged to the outside.

Further, in the diaper 1 according to the present embodiment, the first contraction portion S1 is provided in the waist first region RW1 close to the waist opening end edges 4F9, 4R9, and the first thread rubber is extended along the waist circumference direction. Including 4F1 and 4R1, the body opening is contracted in the waist direction. The second contracted portion S2 includes a second thread rubber 4F2, 4R2 provided in the waist second region RW2 adjacent to the inseam region 1B side with respect to the first contracted portion S1 and extending along the waist circumference direction. The waist opening is contracted in the waist direction. When the diaper 1 according to the present embodiment is viewed in a plan view, the longitudinal end portion of the absorber 8 overlaps with the second contracted portion S2. The second contracted portion S2 has a range extending in the longitudinal direction of the diaper 1 of 15 mm, and the distance A2 between the second thread rubbers 4F2 and 4R2 is 5 mm or more and 7 mm or less. In the second contracted portion S2, a sheet member (for example, a back sheet 7) may be arranged or may be in contact with the absorber 8 and the second thread rubbers 4F2, 4R2.

[Experimental example]
In this embodiment as well, the same experiment as the air permeability quantitative experiment in the first embodiment was performed.
Table 3 shows the results of the air permeability quantitative test. In Table 3, the column of "measurement position" shows the same measurement positions A to E (see FIG. 8) as in the first embodiment, and the rows of measurement positions A to E are the wind speed (m / s) at each measurement position. Is shown. Further, in this experimental example, diapers having three sizes of M size, L size, and Big size were prepared in both Comparative Example 1 and Example 4.

As shown in Table 3, at the measurement position A, the result that the wind speed increased remarkably in Example 4 (0.24 m / s) was obtained as compared with Comparative Example 1 (0.02 m / s). .. On the other hand, regarding the measurement positions B to E, no significant difference was observed between Example 4 and Comparative Example 1. Regarding the measurement position A, it is considered that the flow of air leaking to the outside through the gap between the waist gather G2 and the skin of the dummy doll becomes dominant. Therefore, it can be said that in Example 4 in which the wind speed at the measurement position A is remarkably increased as compared with Comparative Example 1, the air permeability of the waist gather G2 is significantly improved as compared with Comparative Example.

Further, the number of seat members forming the second contracted portion S2 is larger than that of the seat member forming the first contracted portion S1. The first contracted portion S1 is formed of a total of three sheet members, which are a cover sheet 4F, 4R, a folded-back portion 4F5, 4R5, and a ventilation path forming sheet 11F, 11R. The second contracted portion S2 includes a cover sheet 4F, 4R, an inner cover sheet 5F, 5R, a pad cover sheet 6, a back sheet 7, a center sheet 9, a folded-back portion 4F5, 4R5, and a ventilation path forming sheet 11F. , 11R and a total of 7 sheet members. Further, the second contraction portion S2 contains the absorber 8. Therefore, the second contracted portion S2 is more rigid and soft than the first contracted portion S1.

The first contraction portion S1 guarantees a moisture discharge function for discharging the moisture in the internal space of the diaper 1 to the outside and a function for facilitating the expansion of the body opening 2T. On the other hand, the second contraction portion S2 of the waist gather G2 has a position holding function (suppression of slippage) that suppresses slippage when the diaper 1 is worn by increasing the contraction force in the waist circumference direction as compared with the first contraction portion S1. Function) is guaranteed. Further, by making the second contracted portion S2 more rigid than the first contracted portion S1, the first folds 41 and the second folds 42 of the cover sheets 4F and 4R and the ventilation path forming sheets 11F and 11R shown in FIG. 4 The first folds 113 and the second folds 114 can be enlarged, and thus the first ventilation passage 111 and the second ventilation passage 112 can be enlarged.

<Experiment>
Hereinafter, a diaper corresponding to an example of the diaper 1 of the second embodiment and a diaper corresponding to the diaper 101 of the comparative example of the first embodiment were prepared, and the slip-off suppressing function of the diaper was evaluated. A prototype diaper corresponding to an example of the diaper 1 of the second embodiment is hereinafter referred to as "example 4". Further, the comparative diaper corresponding to the diaper 101 of the above comparative example is hereinafter referred to as "Comparative Example 1". In addition, diapers for babies were also prepared in Example 4 and Comparative Example 1.

In this experiment, in both Example 4 and Comparative Example 1, "Leuka HS 470dtex" was used as the thread rubber corresponding to the first thread rubber 4F1, 4R1, and the second thread rubber 4F2, 4R2, the third thread rubber. "Leuka CR 470dtex" as a rubber thread corresponding to 4F3,4R3
Is used. In Example 4, the draft ratio of the thread rubber corresponding to the first thread rubber 4F1, 4R1 is 330% for the M size and 345% for the L size. On the other hand, in Comparative Example 1, the draft ratio of the thread rubber corresponding to the first thread rubber 4F1, 4R1 is 315% regardless of the size. Further, in both Example 4 and Comparative Example 1, the draft rate of the thread rubber corresponding to the second thread rubber 4F2, 4R2 is 315% regardless of the size. Further, in both Example 4 and Comparative Example 1, the draft rate of the thread rubber corresponding to the third thread rubber 4F3, 4R3 is 330% regardless of the size.

Table 4 summarizes the distances between the rubber thread in the first contraction portion and the absorber 8 in the second contraction portion and the first contraction portion in Comparative Examples 1 and 4.

Further, in Example 4 and Comparative Example 1, the rigidity of the portions corresponding to the first contracted portion S1 and the second contracted portion S2 was measured. This measurement was performed by measuring the rigidity and softness with a cantilever according to JIS L1069. In Example 4, the rigidity of the portion corresponding to the first contracted portion S1 was 61 mmN, and the rigidity of the portion corresponding to the second contracted portion S2 was 112 mmN. The smaller the numerical value, the easier it is to bend, and the second contracted portion of Example 4 is harder to bend than the first contracted portion, and the folds become larger. Regarding the number of wrinkles, the width of 5 cm was cut by stretching the vicinity of the center of the second rubber threads 4F2 and 4R2, and the number of folds and the average fold height were measured in the contracted state. In Comparative Example 1, the number was 9 (average fold height 1.3 mm), whereas in Example 4, the number was 6 (average fold height 2 mm). Comparing the cross-sectional area of the fold which is an index of permeability, with respect to Comparative Example 1 In 16.25 mm ^2, Example 4 in 25 mm ^2, and the embodiment 4 is approximately 1.5 times the cross-sectional area than Comparative Example 1 improves.

Further, in Example 4 and Comparative Example 1, the widening strength of the portions corresponding to the first contracted portion S1 and the second contracted portion S2 was measured.

[Wide strength test]
The widening strength test for Example 4 and Comparative Example 1 will be described. Here, for each of Example 4 and Comparative Example 1, the first waist gather when the body opening is widened and deformed.
The widening strength in the range where the contracted portion and the second contracted portion were combined was measured. The widening strength test was carried out for Example 4 and Comparative Example 1 for three types, Big size, L size, and M size, respectively. In both Example 4 and Comparative Example 1, the M size second shrinkage portion S2 had an interval of 7 mm and 5 threads, and the L size and Big size second thread rubbers had an interval of 5 mm and 4 threads.

Set the ring-shaped test piece prepared as described above by hooking it on the jigs fixed to the upper chuck part and the lower chuck part of the stromal tensile tester (manufactured by Toyo Seiki Co., Ltd., product number: YG1E), and set it up and down. By measuring the reaction force when the test piece widens and deforms by gradually widening the separation distance between the chuck parts of the above, the widening strength of the second contracted part (in the waist circumference direction) in Example 4 and Comparative Example 1 Contraction force) was acquired. Here, the speed at which the distance between the upper and lower chuck portions is increased is set to 200 mm / min. The widening strength of the M size test piece was calculated as an average value of the measurement results measured when the separation distances between the upper and lower chuck portions were 30 cm, 44 cm, and 58 cm. The widening strength of the L size and Big size test pieces was calculated as an average value of the measurement results measured when the distances between the upper and lower chuck portions were 38 cm, 48 cm, and 62 cm.

Table 5 shows the results of the widening strength test for Example 4 and Comparative Example 1.

As shown in Table 5, the average value of the widening strength of each test piece prepared in Comparative Example 1 at a widening width of 44 cm was 2.6 N for M size and Big size and 2.8 N for L size, whereas in Example 4. The average value of the widening strength of each of the prepared test pieces at a widening width of 44 cm was 2.4 N for M size and Big size, and 2.5 N for L size. From the viewpoint of ensuring that the second contraction part of the waist gather has a slip-off suppressing function of suppressing the diaper from slipping off from the wearer, the widening strength of the second contraction part is 1.4 N or more for M size and Big size. .4N or less, L size is preferably 1.5N or more and 3.5N or less, and the widening strength of Example 4 is included in the above-mentioned appropriate range. Therefore, the example has a function of suppressing diaper slippage. It was confirmed that it could not be fully exerted.

<Embodiment 3>
Next, the diaper according to the third embodiment will be described. The diaper 1 according to the present embodiment has the same components as the diaper according to the above-described first embodiment. In this embodiment, the same configurations as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the diaper 1 according to the present embodiment, when worn, there is a space between the center sheet 9 (an example of the “skin-side sheet member”) in the region overlapping the vicinity of the longitudinal end of the absorber 8 and the wearer's skin. It is characterized by being formed. The center sheet 9 is a sheet member that is laminated on the absorber 8 to form a skin-facing surface.

Next, the above-mentioned spatial configuration example will be described with reference to FIG. FIG. 10 is a diagram schematically showing a stretched state of the diaper 1 according to the third embodiment. FIG. 10A schematically shows the internal structure of the unfolded and stretched diaper 1 when viewed from the left side. FIG. 10B schematically shows a plan view of the diaper 1 in the expanded and extended state.

In the diaper 1 according to the present embodiment, bending lines 50F and 50R forming a convex shape toward the end portion of the absorber 8 are formed in a region overlapping the vicinity of the end portion in the longitudinal direction when viewed in a plan view. The folding lines 50F and 50R may be formed on the absorber 8 or may be formed on the center sheet 9. The folding lines 50F and 50R may be squeezing grooves formed in the absorber 8 or the center sheet 9. Further, the bending lines 50F and 50R may be formed by embossing (3D embossing) in which the center sheet 9 is formed of two sheet members and formed at the bonding portion of the two sheet members.

In the diaper 1, the bending lines 50F and 50R allow the longitudinal end of the absorber 8 to be curved when worn, so that a space can be formed between the center sheet 9 and the wearer's skin. The diaper 1 can flow the moisture from the absorber 8 that has absorbed the liquid into the first ventilation passage 111 and the second ventilation passage 112 through the space, and efficiently discharge the moisture to the outside. As described above, the diaper 1 according to the present embodiment has good air permeability.

In the diaper 1, the above space may be formed by adhering a stretched rubber thread to the longitudinal end of the absorber 8.

1 ・ ・ Diaper 1B ・ ・ Inseam area 1F ・ ・ Front body area 1R ・ ・ Back body area 2T ・ ・ Body opening G2 ・ ・ Waist gather 4F, 4R ・ ・ Cover sheet 4F1, 4R1 ・ ・ First thread rubber 4F2 4R2 ... 2nd thread rubber 4F3, 4R3 ... 3rd thread rubber 4F4, 4R4 ... 4th thread rubber 11F, 11R ... Ventilation path forming sheet S ... Joint part S1 ... 1st contraction part S2 ... 2 contraction part S3 ... 3rd contraction part S4 ... 4th contraction part

Claims (7)

A front body area covering the wearer's abdomen, a back body area covering the wearer's back, and an inseam area located between the front body area and the back body area and where an absorber is arranged are continuously provided. It is an absorbent article
Of the front body area and the back body area, the first area close to the end edge of the body opening forming the body opening through which the wearer's body can be inserted is provided and extends along the waist circumference direction. A first contraction portion that includes a first expansion / contraction member and contracts the body opening in the waist direction.
Among the front body region and the back body region, the second elastic member provided in the second region adjacent to the inseam region side with respect to the first region and extended along the waist circumference direction is included. A second contraction portion that contracts the body opening in the waist circumference direction,
With
The first elastic member is adhered to a sheet member forming the first contraction portion.
A plurality of the first telescopic members are arranged at regular intervals in the first contraction portion, and the distance between the first telescopic members is 6.5 mm or more and 20 mm or less.
The range from the trunk opening end edge where the first contraction portion extends in the longitudinal direction connecting the front body region and the back body region is 26 mm or more and 31 mm or less.
A plurality of the second elastic members are arranged in the second contraction portion, and the distance between the second elastic members is set to be smaller than the distance between the first elastic members. And
The longitudinal end of the absorber and the first contraction are in contact with each other.
Absorbent article. The second contracted portion has greater rigidity and softness than the first contracted portion.
The absorbent article according to claim 1. A front body area covering the wearer's abdomen, a back body area covering the wearer's back, and an inseam area located between the front body area and the back body area and where an absorber is arranged are continuously provided. It is an absorbent article
Of the front body area and the back body area, the first area close to the end edge of the body opening forming the body opening through which the wearer's body can be inserted is provided and extends along the waist circumference direction. A first contraction portion that includes a first expansion / contraction member and contracts the body opening in the waist direction.
Among the front body region and the back body region, the second elastic member provided in the second region adjacent to the inseam region side with respect to the first region and extended along the waist circumference direction is included. A second contraction portion that contracts the body opening in the waist circumference direction,
A skin-side sheet member that is laminated on the absorber to form a skin-facing surface,
With
The first elastic member is adhered to a sheet member forming the first contraction portion.
A plurality of the first telescopic members are arranged at regular intervals in the first contraction portion, and the distance between the first telescopic members is 6.5 mm or more and 20 mm or less.
The range from the trunk opening end edge where the first contraction portion extends in the longitudinal direction connecting the front body region and the back body region is 26 mm or more and 31 mm or less.
A plurality of the second elastic members are arranged in the second contraction portion, and the distance between the second elastic members is set to be smaller than the distance between the first elastic members. And
When worn, a space is formed between the skin-side seat member and the wearer's skin in a region overlapping the vicinity of the longitudinal end of the absorber.
Absorbent article. A bending line that becomes convex toward the longitudinal end portion is formed in the absorber in a region that overlaps with the vicinity of the longitudinal end portion of the absorber when viewed in a plan view.
The absorbent article according to claim 3. A bending line that becomes convex toward the longitudinal end portion of the absorber in the vicinity of the longitudinal end portion when viewed in a plan view is formed on the skin side sheet member.
The absorbent article according to claim 3. The distance between the first telescopic members is 6.5 mm or more and 13 mm or less.
The absorbent article according to any one of claims 1 to 5. The first contracted portion has a laminated structure in which sheet members are laminated in at least three layers.
The absorbent article according to any one of claims 1 to 6.

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