CN112243369B - absorbent articles - Google Patents

Abstract

Provided is an absorbent article having superior air permeability compared to conventional articles. The absorbent article includes a1 st contraction part which includes a1 st expansion member provided in a1 st region close to a trunk opening end edge forming a trunk opening through which a trunk of a wearer can be inserted out of a front trunk region and a rear trunk region and extending along a trunk direction, and contracts the trunk opening in the trunk direction, wherein a plurality of 1 st expansion members are arranged at a constant interval in the 1 st contraction part, and the interval between the 1 st expansion members is 6.5mm or more and 20mm or less.

Description

absorbent article

technical field

The present invention relates to absorbent articles.

Background technique

Absorbent articles such as disposable diapers, urine pads, and sanitary napkins are provided with absorbent bodies for absorbing excreted fluids such as urine and body fluids. As such an absorber, pulp, super absorbent polymer (Super Absorbent Polymer: SAP), etc. are used, for example.

In addition, when the absorbent article is worn, moisture generated from urine, body fluid, etc. absorbed in the absorbent body tends to remain in the inner space of the absorbent article (formed between the wearer's skin and the skin-contacting surface of the absorbent article). space between), and this moisture becomes the cause of skin problems such as skin inflammation, and also becomes the cause of discomfort such as hot flashes and stickiness, so it is not preferable.

Then, when the absorbent article is worn, various proposals have been made for improving the air permeability of the absorbent article in order to discharge the moisture remaining in the inner space of the absorbent article to the outside (for example, refer to Patent Document 1 Wait). For example, there is known a primary fabric that uses elastic members to contract the outer layer sheet and the inner layer sheet in the circumferential direction of the waist to form pleats around the waist (Japanese: ウエスト回り) and to discharge moisture to the outside from the gap between the pleats and the wearer's skin. sex diapers.

prior art literature

patent documents

Patent Document 1: Japanese Patent No. 5761179

Contents of the invention

The problem to be solved by the invention

Although various proposals have been made for improving the air permeability of absorbent articles as described above, provision of absorbent articles with higher air permeability is actually desired. Then, one object of the present invention is to provide an absorbent article having better air permeability than conventional ones.

Technical solutions for solving problems

In order to solve the above-mentioned problems, the absorbent article of the present invention comprises a front body region covering the abdomen of the wearer, a rear body region covering the wearer's back, and an absorbent article located between the front body region and the rear body region. The absorbent article in which the crotch region of the absorbent body is placed in a row is provided with a first constricted part, and the first constricted part is provided in the front body region and the rear body region and can form a The first region where the end edge of the trunk opening of the trunk opening for the wearer's trunk is inserted is close to and extends along the first telescopic member in the direction around the trunk, so that the trunk opening shrinks in the direction around the trunk, A plurality of the first telescopic members are arranged at constant intervals in the first constricted portion, and the distance between the first telescopic members is 6.5 mm to 20 mm.

Here, the interval between the first telescopic members may be not less than 6.5 mm and not more than 13 mm.

In addition, the range extending from the trunk opening edge in the longitudinal direction connecting the front body region and the rear body region of the first constricted portion may be 26 mm or more and 31 mm or less.

In addition, the first constricted portion may have a laminated structure in which at least three sheet members are laminated.

In addition, a second constricted part may be further provided, and the second constricted part may be provided in the front body region and the rear body region on the side of the crotch region with respect to the first region. The adjacent second region is extended along the second telescopic member in the direction around the trunk, and the trunk opening is contracted in the direction around the trunk, and a plurality of the second telescopic members are arranged in the second constricted part , and the distance between the second telescopic members is set to be smaller than the distance between the first telescopic members.

The effect of the invention

According to the above-mentioned absorbent article, it is also possible to obtain better air permeability than conventional ones.

Description of drawings

FIG. 1 is a perspective view of a pull-on disposable diaper according to Embodiment 1. FIG.

FIG. 2 is an exploded perspective view of the diaper of Embodiment 1. FIG.

Fig. 3 is a diagram schematically showing a state in which the diaper according to Embodiment 1 is unfolded.

It is a figure explaining the installation form of the ventilation passage forming sheet of the diaper of Embodiment 1.

Fig. 5 is a diagram schematically showing a state in which a diaper of a comparative example is unfolded.

Fig. 6 is a diagram illustrating intervals of first linear rubbers and pleats formed in first constricted portions of a diaper according to a comparative example.

Fig. 7A is a diagram illustrating gathers in a first constricted portion of the waist gather according to the first embodiment.

Fig. 7B is a diagram illustrating gathers in a first constricted portion of a waist gather of a comparative example.

Fig. 8 is a diagram illustrating wind speed measurement positions in an air permeability quantitative test.

Fig. 9 is a diagram showing a mist air permeation tester used in a mist air permeation test.

Fig. 10A is an enlarged photograph of the pleats forming the waist gather of the example.

Fig. 10B is an enlarged photograph of pleats forming a waist gather of a comparative example.

Fig. 11 is a diagram schematically showing a state in which the diaper according to Embodiment 2 is unfolded.

Fig. 12 is a diagram schematically showing a state in which the diaper according to Embodiment 3 is unfolded.

FIG. 13 is a perspective view of a pull-on disposable diaper according to Embodiment 4. FIG.

FIG. 14 is an exploded perspective view of a diaper according to Embodiment 4. FIG.

Fig. 15 is a diagram schematically showing a state in which the diaper according to Embodiment 4 is unfolded.

Fig. 16 is a diagram illustrating an installation mode of an air passage forming sheet of a diaper according to Embodiment 4.

FIG. 17 is a view showing the site of a joint portion where air passage forming sheets are joined.

Fig. 18 is a graph showing the magnitude of contraction force in each contraction portion.

Fig. 19 is a diagram illustrating pleats formed in a second constricted portion of a waist gather and a third constricted portion of a belly gather.

Fig. 20 is a diagram schematically showing a state in which a diaper according to a modified example is unfolded.

Fig. 21 is a diagram illustrating pleats formed in the first and second constricted parts of the waist gathers and the third constricted part of the belly gathers.

Fig. 22 is a diagram showing air holes formed at the opening edge of the trunk opening when the waist gathers are contracted.

Detailed ways

Embodiments of the present invention will be described below. Embodiment shown below is an example of embodiment of this invention, and does not limit the technical scope of this invention to the following form.

<Embodiment 1>

FIG. 1 is a perspective view of a pull-on disposable diaper (hereinafter, simply referred to as "diaper") 1 according to Embodiment 1. As shown in FIG. Fig. 2 is an exploded perspective view of the diaper 1 according to the embodiment. In addition, FIG. 3 is a figure which shows typically the state which expanded the diaper 1 of Embodiment 1. As shown in FIG. (A) of FIG. 3 has shown typically the internal structure in the case of seeing the diaper 1 at the time of unfolding from the left side. (B) of FIG. 3 schematically shows the planar structure of the diaper 1 at the time of development.

The term related to the direction used in this specification means the direction which matches the front, rear, left, and right of the wearer in the state where the diaper 1 is worn on the wearer. For example, when referring to the left-right direction in this specification, it means the direction which matches the right and left of the wearer in the state where the diaper 1 is worn on the wearer.

In addition, in this specification, the "front body region" of the diaper 1 means the part which covers the abdomen (body front) of a wearer when the diaper 1 is worn on a wearer. "The crotch region" of the diaper 1 means the part which covers the crotch of a wearer when the diaper 1 is put on a wearer. The "back body region" of the diaper 1 means a portion covering the back (back of the body) of the wearer when the diaper 1 is worn on the wearer. In addition, in this specification, "the longitudinal direction" means the direction which connects the front body area of the diaper 1, and the back body area. That is, the longitudinal direction of the diaper 1 coincides with the direction in which the front body region, the crotch region, and the rear body region are connected. In addition, "the width direction" means the direction orthogonal to the longitudinal direction of the diapar 1.

In the present embodiment, as an example of an absorbent article, an underpants-type tubular structure having an opening through which the wearer's abdomen enters and a pair of left and right openings through which the wearer's left and right lower limbs are inserted is exemplified. Disposable diapers, but the "absorbent article" in this specification is not limited to underpants type disposable diapers. In the "absorbent article", for example, it includes a belt that is fixed to the vicinity of one end of a sheet-shaped member that covers the wearer's crotch (pubic area) from the front body area to the rear body area. Absorbent articles of various forms that can wrap around the abdomen and crotch, such as belt-type disposable diapers that are attached to the vicinity of the other end of the member to form a tubular structure.

As shown in FIGS. 1 to 3 , the diaper 1 has a crotch region 1B covering the wearer's crotch (pubic area), a front body region 1F covering the wearer's abdomen, and a rear thigh covering the wearer's back in the worn state. body area 1R. The crotch area 1B is located between the front body area 1F and the back body area 1R and is connected with the front body area 1F and the back body area 1R, and the absorbent part main body 15 ( Absorbent body 8).

The diaper 1 in this embodiment is an underpants-type disposable diaper, so by joining the left edge of the front body region 1F and the left edge of the rear body region 1R to each other and connecting the right edge of the front body region 1F It joins with the right edge of the rear body region 1R to form the state shown in FIG. 1 . As shown in FIG. 1 , a trunk opening (waist opening) 2T is formed by the upper edge of the front body region 1F and the upper edge of the rear body region 1R. In addition, in the diaper 1 , a left lower limb opening 2L is formed on the left side of the crotch region 1B that is not joined, and a right lower limb opening 2R is formed on the right side of the crotch region 1B. The left lower limb opening 2L and the right lower limb opening 2R are openings for passing the wearer's legs when the diaper 1 is worn.

If the diaper 1 is worn in such a way that the wearer's left lower limb is inserted into the left lower limb opening 2L, the wearer's right lower limb is inserted into the right lower limb opening 2R, and the wearer's trunk enters (passes) the trunk opening 2T, then With "the front body area 1F is in contact with the wearer's abdomen and the rear body area 1R is in contact with the wearer's back side, the crotch area 1B is in close contact with the wearer's crotch (Japanese: thigh), and the left lower limb The 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, standing and walking in the state where the diaper 1 is worn can be realized.

In the diaper 1, the absorber 8 capable of absorbing and holding liquid is arranged mainly around the crotch region 1B. In addition, in the diaper 1, three-dimensional pleats are respectively provided in the left lower limb opening 2L, the right lower limb opening 2R, and the trunk opening 2T in order to suppress the formation of a gap that becomes a liquid outflow path between the diaper 1 and the wearer's skin. Pleats G1L, three-dimensional pleats G1R, waist pleats G2. The three-dimensional gathers G1L, G1R and the waist gathers G2 are configured to be closely attached to the wearer's skin by the elastic force of the linear rubber, so that the excrement discharged from the wearer can be absorbed in the absorbent without leaking from the diaper 1. The part main body 15 (absorbent body 8).

As shown in FIG. 2 and FIG. 3 , the diaper 1 has cover sheets 4F and 4R and a pad cover sheet 6 that form the outer surface in a state worn by a wearer. The cover sheet 4F is a sheet member mainly forming the outer surface of the front body region 1F of the diaper 1 . In addition, the pad cover sheet 6 is a sheet member mainly used to form the outer surface of the crotch region 1B of the diaper 1 . In addition, the cover sheet 4R is a sheet member mainly used to form the outer surface of the back body region 1R of the diaper 1 .

The cover sheets 4F, 4R and the pad cover sheet 6 are provided for, for example, reinforcement of the outer surface of the diaper 1 and improvement of texture. In addition, the cover sheets 4F, 4R and the pad cover sheet 6 can be formed of, for example, a nonwoven 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), polypropylene (PP), and the like. In addition, a liquid-impermeable sheet may be formed with many fine pores of about 0.1 to several μm so as to exhibit liquid-impermeability and moisture permeability.

Moreover, the diaper 1 has the inner cover sheet 5F laminated|stacked on the skin facing side of the cover sheet 4F, and the inner cover sheet 5R laminated|stacked on the skin facing side of the cover sheet 4R. In this specification, "the skin facing surface" means the surface which opposes the wearer's skin when the wearer wears the diaper 1 . Details will be described later. The inner cover sheet 5F is a sheet member bonded to the cover sheet 4F in a state in which linear rubber as a linear elastic member is sandwiched between layers with the cover sheet 4F. The inner cover sheet 5F is a sheet member having a shape and a size corresponding to the portion of the cover sheet 4F except for a folded portion 4F5 described later and the first waist region RW1 of the outer cover portion 4F10 . In addition, the inner cover sheet 5R is a sheet member bonded to the cover sheet 4R in a state in which linear rubber as a linear elastic member is interposed between layers with the cover sheet 4R. The inner cover sheet 5R is a sheet member having a shape and a size corresponding to a portion of the cover sheet 4R except for a folded portion 4R5 described later and the first waist region RW1 of the outer cover portion 4R10 .

The diaper 1 of this embodiment is equipped with the absorption part main body 15. As shown in FIG. The absorber main body 15 is held in a state of being spanned between the front body region 1F and the rear body region 1R, and is arranged on the crotch of the wearer when the diaper 1 is worn, and absorbs and holds liquid such as urine excreted by the wearer. As shown in FIGS. 2 and 3 , the absorber main body 15 includes the cover sheet 6 , the back sheet 7 , the absorber 8 , the central sheet 9 , and the side sheets 10L, 10R, etc., and is integrally formed of these.

The backsheet 7, the absorber 8, and the center sheet 9 are laminated sequentially on the skin-facing surface of the pad sheet 6. The pad cover sheet 6 is a sheet member having a rectangular plane having a length extending from the wearer's front body through the crotch to the rear body in the length direction, and having a width direction perpendicular to the length direction. Has a predetermined lateral width. In addition, the back sheet 7, the absorber 8, and the central sheet 9 are all sheet members having a rectangular plane similar to the pad sheet 6, and are pressed against the pad sheet 6 in a state where the longitudinal direction coincides with the longitudinal direction of the pad sheet 6. The back sheet 7, the absorber 8, and the center sheet 9 are laminated in this order.

The absorber 8 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 8 is arranged between the liquid-impermeable backsheet 7 and the liquid-permeable center sheet 9 . The absorber 8 may also have short fibers of cellulose-based fibers such as pulp fibers, rayon fibers, or cotton fibers, or synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. The interstices of the obtained short fibers have a structure of granular absorbent resin such as a hydrophilic superabsorbent polymer having a crosslinked structure capable of absorbing and retaining water. Thereby, when the absorber 8 absorbs the liquid excreted from the wearer, it can swell the absorbent resin held in the gaps in the short fibers to hold the liquid in the short fibers. In addition, 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 stacked. In addition, the absorber 8 can take an appropriate shape according to the purpose. Examples of the shape of the absorber 8 include a rectangular shape, an hourglass shape narrowed in the vicinity of the center, and various other shapes.

The center sheet 9 is a sheet member for directly touching the skin of the crotch of the wearer and allowing liquid such as urine to pass through the absorber 8 , and is laminated so as to cover the water-absorbing surface of the absorber 8 . The central sheet 9 in this embodiment is formed of a highly flexible liquid-permeable material. As a liquid-permeable material which forms the center sheet|seat 9, a woven fabric, a nonwoven fabric, a porous film etc. can be illustrated, for example. In addition, the center sheet 9 may have hydrophilicity.

The backsheet 7 is a sheet member for suppressing leakage of the liquid absorbed by the absorber 8 through the center sheet 9 to the outside of the diaper 1 . Thus, the backsheet 7 is formed of a liquid-impermeable material. As a liquid-impermeable material which forms the back sheet 7, the liquid-impermeable film etc. which consist of polyethylene resin can be illustrated. In addition, the back sheet 7 may be formed of a microporous polyethylene film in which many micropores are formed in order to ensure air permeability.

The pad sheet 6 is a member for reinforcing the back sheet 7 and making it feel good on the skin, and is attached to the back sheet 7 . As a material which forms the pad sheet 6, a woven fabric and a nonwoven fabric can be illustrated. In addition, the cover sheet 6 may be nonwoven fabric or wet laid nonwoven fabric made of thermoplastic resin such as polyethylene, polypropylene, polyester, or the like.

The side panels 10L, 10R in the absorber body 15 are elongated belt-shaped members for forming the above-mentioned three-dimensional gathers G1L, G1R. The side panels 10L and 10R are extended along the long sides of the central panel 9 . In addition, linear rubbers 10L1 and 10R1 are adhered to the side sheets 10L and 10R along the longitudinal direction. If 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 rear body region 1R are joined to each other and will form the front body The right edge 4F8 of the cover sheet 4F of the right edge of the region 1F and the right edge 4R8 of the cover sheet 4R of the right edge of the rear body region 1R are joined together to form the diaper 1 shown in FIG. 10L and 10R are stretched in the longitudinal direction by the contraction force of the linear rubbers 10L1 and 10R1, and as a result, stand up from the center sheet 9 along the fold lines 10L2 and 10R2.

Thereby, three-dimensional gathers G1L, G1R which prevent the outflow of liquid from 2L of left lower-limb opening parts, and 2R of right lower-limb opening parts are formed. The method of joining the side edges of the cover sheets 4F, 4R is not particularly limited, but examples thereof include heat sealing, high-frequency sealing, ultrasonic sealing, and the like. Furthermore, the absorber main body 15 extends from the front body region 1F to the rear body region 1R.

Next, the detailed structure of the diaper 1 is demonstrated. As shown in FIG. 3 , the front end side of the cover sheet 4F is folded inward with a fold line 4F6 as a boundary to form a folded portion 4F5 . Hereinafter, the part other than the folded part 4F5 in the cover sheet 4F is called exterior cover part 4F10. The exterior cover part 4F10 of the cover sheet 4F forms the outer surface of the diaper 1 . The folded line 4F6 of the cover sheet 4F forms the trunk opening edge 4F9 of the trunk opening 2T in the assembled state of the diaper 1 .

In the folded portion 4F5 of the cover sheet 4F, the stretched first linear rubber 4F1 is arranged between the layers of the outer cover portion 4F10 . In addition, the front end side of the folded portion 4F5 in the cover sheet 4F sandwiches the inner cover sheet 5F, the pad cover sheet 6, the back sheet 7, and the absorber 8 at one end side in the longitudinal direction with the outer cover portion 4F10. In the state between them, it is bonded in a state of being superimposed on one end of the absorber 8 . In addition, in this specification, it is expressed that the form of overlapping one member and another member is not limited to the form in which the members are in full contact with each other, but includes a form in which a part of one member overlaps the other member as a whole, or Concepts such as the way a component and parts of other components overlap each other.

And, as shown in FIG. 3, between the layers of the outer cover portion 4F10 of the cover sheet 4F and the inner cover sheet 5F, from the side of the fold line 4F6, the second linear rubber 4F2, the third linear rubber 4F3, the fourth linear rubber The shape rubber 4F4 is sequentially arranged in this order, and is bonded 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 linear rubbers 4F1 to fourth linear rubbers 4F4 are arranged in parallel in the cover sheet 4F, and all extend along the width direction (direction around the trunk) of the cover sheet 4F.

On the other hand, also in the cover sheet 4R, the front end side is folded inward with the fold line 4R6 as a boundary to form a folded portion 4R5. Hereinafter, the portion other than the folded portion 4R5 in the cover sheet 4R is referred to as an exterior cover portion 4R10. The exterior cover part 4R10 of the cover sheet 4R forms the outer surface of the diaper 1 . The folded line 4R6 of the cover sheet 4R forms the trunk opening edge 4R9 of the trunk opening 2T in the assembled state of the diaper 1 . In the folded portion 4R5 of the cover sheet 4R, the stretched first linear rubber 4R1 is arranged between the layers of the outer cover portion 4R10. In addition, the front end side of the folded part 4R5 in the cover sheet 4R sandwiches 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 with the outer cover part 4R10. The state between the layers is bonded in a state of overlapping the other end of the absorber 8 .

And, as shown in FIG. 3 , between the layers of the outer cover portion 4R10 of the cover sheet 4R and the inner cover sheet 5R, from the fold line 4R6 side, the second linear rubber 4R2 , the third linear rubber 4R3 , the fourth thread The shape rubber 4R4 is sequentially arranged in this order, and is bonded 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 linear rubbers 4R1 to fourth linear rubbers 4R4 in the cover sheet 4R are arranged in parallel, and all extend along the width direction (direction around the trunk) of the cover sheet 4R.

Hereinafter, in the cover sheets 4F and 4R of the diaper 1, the region where the first linear rubbers 4F1 and 4R1 and the second linear rubbers 4F2 and 4R2 are arranged is referred to as "waist region RW". The waist region RW of the diaper 1 is a region that is located near the trunk opening end edges 4F9 and 4R9 that form the trunk opening 2T and that forms the waist gathers G2. In addition, the region in which the first linear rubbers 4F1 and 4R1 are arranged in the waist region RW is referred to as a "waist first region RW1" (first region), and the region in which the second linear rubbers 4F2 and 4R2 are arranged is called "Waist 2nd area RW2" (2nd area).

Moreover, in the cover sheets 4F, 4R of the diaper 1, the area|region where the 3rd linear rubber 4F3, 4R3 and the 4th linear rubber 4F4, 4R4 are arrange|positioned is called "abdominal area (Japanese: Tami-region) RT". The abdomen region RT is a region located below the waist region RW. In the abdominal region RT, the region where the third linear rubbers 4F3 and 4R3 are arranged is referred to as "the first abdominal region RT1", and the region where the fourth linear rubbers 4F4 and 4R4 are arranged is referred to as the "second abdominal region RT2". .

Here, the first linear rubbers 4F1, 4R1 in the waist first region RW1 are coated with an adhesive in a stretched state, for example, during the assembling process of the diaper 1, and then the outer covering parts 4F10, 4R10 and The folded portions 4F5 and 4R5 are sandwiched between and bonded between these layers. Similarly, the second linear rubbers 4F2, 4R2 in the waist second region RW2 and the third linear rubbers 4F3, 4R3 and fourth linear rubbers 4F4, 4R4 in the abdominal region RT are, for example, in the process of assembling the diaper 1. After the adhesive is applied in the stretched state, it is sandwiched between the outer cover parts 4F10 and 4R10 of the cover sheets 4F and 4R and the inner cover sheets 5F and 5R to be bonded between these layers.

Here, if the first linear rubber 4F1 of the waist first region RW1 is sandwiched and bonded between the outer cover portions 4F10, 4R10 of the cover sheets 4F, 4R and the inner cover sheets 5F, 5R in an elongated state, , 4R1 contract, then following it, the parts corresponding to the first waist region RW1 in the outer cover parts 4F10, 4R10 and the folded parts 4F5, 4R5 are flexed continuously in a pleated shape, thereby forming the first waist region RW1 in the The first contraction part S1 contracted in the direction around the trunk.

Also in the waist second region RW2, if the second linear rubber 4F2, 4R2 sandwiched and bonded between the layers of the outer cover parts 4F10, 4R10 and the inner cover sheets 5F, 5R in an extended state shrinks, the following In addition, the parts corresponding to the second waist region RW2 in the outer cover parts 4F10, 4R10 and the inner cover sheets 5F, 5R are continuously bent in a pleated shape, thereby forming a shape that shrinks the second waist region RW2 in the direction around the trunk. The second constriction S2.

In the present embodiment, the waist gathers G2 are mainly formed by the first constricted portion S1 formed in the first waist region RW1 and the second constricted portion S2 formed in the second waist region RW2. The waist gathers G2 improve the fit of the diaper 1 around the wearer's waist by the contraction force of the first linear rubbers 4F1, 4R1 and the second linear rubbers 4F2, 4R2. In the first constricted portion S1 of the waist gather G2, three first linear rubbers 4F1, 4R1 are arranged in parallel with each other at a constant interval A1. In addition, in the second constricted portion S2 of the waist gather G2, a plurality of second linear rubbers 4F2 and 4R2 are provided parallel to each other at a constant interval A2. In the present embodiment, the distance A1 between the first linear rubbers 4F1 and 4R1 in the first constricted portion S1 is set to be larger than the distance A2 between the second linear rubbers 4F2 and 4R2 in the second constricted portion S2. Accordingly, the first constricted portion S1 assumes a moisture discharge function of discharging moisture in the internal space of the diaper 1 to the outside, and a function of easily expanding the trunk opening 2T. On the other hand, the second constricted portion S2 of the waist gathers G2 assumes a position holding function (slip suppression function) for suppressing slipping when the diaper 1 is worn by increasing the contraction force in the direction around the trunk compared with the first constricted portion S1. ). In addition, the space|interval of linear rubbers mentioned here means the dimension by which adjacent linear rubbers isolate|separate in the longitudinal direction (direction which connects a front body area and a rear body area) of a diaper.

In addition, in this embodiment, the first linear rubbers 4F1 and 4R1 in the waist first region RW1 and the second linear rubbers 4F2 and 4R2 in the waist second region RW2 extend over the entire width of the cover sheets 4F and 4R. Therefore, after completion of the diaper 1 , the first linear rubbers 4F1 , 4R1 and the second linear rubbers 4F2 , 4R2 form a substantially annular elastic member that goes around along the trunk opening 2T. In other words, after the completion of the diaper 1, the waist gathers G2 (1st contraction part S1, 2nd contraction part S2) are formed over the whole circumference around a trunk direction.

Also in the abdomen first region RT1, if the third linear rubber 4F3 sandwiched and bonded between the layers of the outer cover parts 4F10, 4R10 of the cover sheets 4F, 4R and the inner cover sheets 5F, 5R in an elongated state, , 4R3 contract, then following it, the outer cover parts 4F10, 4R10 of the cover sheets 4F, 4R and the parts corresponding to the first abdominal region RT1 in the inner cover sheets 5F, 5R flex continuously in a pleated shape, thereby forming The third constricted part S3 contracted in the direction around the trunk of the first abdominal region RT1. Moreover, the 3rd constricted part S3 is the area|region which fits around the height of the wearer's waist bone at the time of wearing of the diaper 1. In the present embodiment, it is preferable to avoid slippage by making the contraction force of the third constricted portion S3 (hereinafter, also referred to as “expansion strength”) smaller than that of the second constricted portion S2 which assumes the position holding function (slip-down suppression function). The wearer exerts excessive pressure.

In addition, also in the abdomen second region RT2, if the fourth linear shape sandwiched and bonded between the layers of the outer cover parts 4F10, 4R10 of the cover sheets 4F, 4R and the inner cover sheets 5F, 5R is in an extended state. When the rubber 4F4, 4R4 shrinks, the outer cover parts 4F10, 4R10 of the cover sheets 4F, 4R and the parts corresponding to the second abdominal region RT2 of the cover sheets 4F, 4R and the inner cover sheets 5F, 5R are continuously flexed in a pleated shape, thereby A fourth contraction portion S4 is formed that contracts the second abdominal region RT2 in the direction around the trunk. In addition, in this embodiment, the abdominal gather G3 is mainly formed by the 3rd constricted part S3 formed in the 1st abdomen region RT1, and the 4th constricted part S4 formed in the 2nd abdomen region RT2. The belly gather G3 improves the fit of the diaper 1 around the wearer's lower abdomen, for example, by the contraction force of the third linear rubbers 4F3 and 4R3 and the fourth linear rubbers 4F4 and 4R4.

In addition, in this embodiment, in order to form the first constricted portion S1 to the fourth constricted portion S4, each of the linear rubbers 4F1, 4R1, 4F2, 4R2, 4F3, 4R3, 4F4, 4R4 is placed along the edges of the cover pieces 4F, 4R. It is extended in the width direction (direction around the trunk), but any linear stretchable member is sufficient, and it is not limited to linear rubber, and other materials and forms may be used. In addition, in the present specification, "linear" means a form that is elongated and extends in a specific direction, and is a concept including strip-like and rectangular shapes. In addition, although natural rubber, synthetic rubber, etc. can be illustrated as a material of linear rubber, it is not limited to a specific material.

Next, the ventilation passage forming sheets 11F and 11R of the diaper 1 will be described. As shown in Fig. 2 and Fig. 3, the diaper 1 is provided with the longitudinal direction end regions of the pad cover sheet 6, the central sheet 9, etc. The air passage forming sheets 11F, 11R on the skin side of the folded portions 4F5 , 4R5 and the cushion sheet 6 are stacked and arranged in a stacked manner. The air passage forming sheets 11F and 11R form the skin contact surface in the waist gathers G2 of the diaper 1 . The "skin contact surface" means the surface which 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 figure explaining the installation form of air passage forming sheet|seat 11F, 11R of the diaper 1 which concerns on embodiment. (A) of FIG. 4 is a figure which shows the state which looked at the 1st contraction part S1 of the waist gather G2 from the internal space side of the diaper 1. Moreover, (B) of FIG. 4 is a figure which shows typically the internal structure in the 1st contraction part S1 of the waist gathers G2 at the time of seeing from the side of the diaper 1. As shown in FIG. In addition, (C) of FIG. 4 is a figure which shows the state which watched the 1st contraction part S1 of the waist gather G2 from the upper direction of the diaper 1 (namely, the A direction of (B) viewing direction). (A) and (C) of FIG. 4 have shown the state before the 1st contraction part S1 in the waist gather G2 contracted for convenience. In addition, (D) of FIG. 4 is a figure which shows the state which looked at the 1st contraction part S1 of the waist gather G2 after contraction from above.

The air passage forming sheets 11F, 11R are laminated so as to cover at least a part of the folded portions 4F5, 4R5 of the skin-facing surface forming the first constricted portion S1 of the waist first region RW1, and are arranged through the junction portion denoted by reference sign S. And it is joined to the longitudinal end region and the folded-back parts 4F5 and 4R5 of the gasket sheet 6 . In this embodiment, the joint portion is formed by joining the folded portions 4F5, 4R5 of the cover sheets 4F, 4R formed of thermoplastic resin and the air passage forming sheets 11F, 11R of the backing sheet 6 by ultrasonic welding. S. As shown in FIG. 4(A), a plurality of joints S are intermittently arranged along the longitudinal direction perpendicular to the direction around the trunk (width direction) from the trunk opening edge 4F9, 4R9 of the cover pieces 4F, 4R. , the linear joint SL extending in the longitudinal direction of the diaper 1 is formed. In other words, one linear junction SL is formed as an aggregate of a plurality of junctions S arranged intermittently along the longitudinal direction of the diaper 1 . Here, disposing "intermittently" means discontinuously or intermittently disposing.

As shown in FIG. 4(A) , a plurality of linear joints SL are intermittently arranged in the first constricted portion S1 of the waist gathers G2 along the torso-circling direction (width direction) of the cover sheets 4F, 4R. In the example shown in FIG. 4(A), each linear junction part SL is mutually provided in parallel, and the space|interval of linear junction part SL is set so that the magnitude|size may alternate. That is, the linear joints SL are intermittently arranged in such a manner that the double wires formed by one set of the linear joints SL are arranged side by side at equal intervals in the direction around the trunk (width direction). In addition, in FIG.3(A), the range which linear junction part SL extends in the longitudinal direction of the diaper 1 is shown by hatching. As shown in the drawing, the linear joint SL extends across the first waist region RW1 forming the first constricted portion S1 and the second waist region RW2 forming the second constricted portion S2.

Ultrasonic bonding of the air passage forming sheets 11F, 11R to the folded portions 4F5, 4R5, etc. is performed while the first linear rubbers 4F1, 4R1 and the second linear rubbers 4F2, 4R2 of the waist gather G2 are stretched. . In addition, after the air passage forming sheets 11F, 11R are joined to the folded portions 4F5, 4R5, etc., the stretches of the first linear rubbers 4F1, 4R1 and the second linear rubbers 4F2, 4R2 are sandwiched and fixed between the sheet layers. The long state is released. As a result, the waist gathers G2 shrink, and the distance between the linear joining portions SL in the air passage forming sheets 11F, 11R narrows. Thereby, the non-joint region 110 located between the linear joint parts SL among the air passage forming sheets 11F and 11R is deformed into a wave shape by bending.

As a result, the folded portions 4F5, 4R5 of the cover sheets 4F, 4R are separated from the non-joint regions 110 of the air passage forming sheets 11F, 11R, thereby forming a folded portion 4F5, 4R5 and the air passage form the first air passage 111 surrounded by the non-joined regions 110 of the sheets 11F, 11R. In addition, the second air passage 112 can be formed on the skin contact surface 11a side of the air passage forming sheets 11F, 11R. The code|symbol SS shown by the dashed-two dotted line of FIG.4(D) shows the skin surface which contact|abuts to air passage forming sheet|seat 11F, 11R when the wearer wears diaper 1 as a phantom line. The second air passage 112 is formed as a gap formed between the skin contact surfaces 11a of the air passage forming sheets 11F, 11R and the wearer's skin when the wearer wears the diaper 1 . 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 gathers G2. The first ventilation passage 111 is a ventilation passage through which moisture permeated through the ventilation passage forming sheets 11F and 11R from the internal space of the diaper 1 passes. On the other hand, the second ventilation passage 112 is a ventilation passage directly connecting the internal space of the diaper 1 with the external space, and can discharge moisture in the diaper 1 more smoothly.

As shown in FIG. 4(D) , after the waist gathers G2 are shrunk, relatively large first gathers 41 and relatively small second gathers 42 forming the first contracted portion S1 are alternately formed. In addition, relatively large first pleats 113 and relatively small second pleats 114 are alternately formed in the air passage forming sheets 11F and 11R that are deformed into waves by bending. This is because the intervals between the linear junctions SL are set so as to be alternately large and small. That is, the large first pleats 41 and 113 are formed by a set of linear joints SL with a wide interval, and the small second pleats 42 and 114 are formed by a set of linear joints SL with a narrow interval.

Here, the first pleats 113 of the air passage forming sheets 11F, 11R bent and deformed into waves function to secure the large first air passage 111 in cooperation with the first pleats 41 forming the first constricted portion S1 . On the other hand, the second pleats 114 of the air passage forming sheets 11F, 11R cooperate with the second pleats 42 forming the first constricted portion S1 to form the first air passage 111 and are adjacent to each other in the direction around the trunk (width direction). The first pleats 113 are properly separated from each other to ensure the air-permeable cross-section of the second air-permeable passage 112 to function. In this embodiment, by providing the groove structure formed by the air passage forming sheets 11F, 11R deformed into waves following the contraction of the first constricted part S1 on the side of the skin contacting surface of the waist gather G2, it is possible to pass the first constriction. The air passage 111 and the second air passage 112 efficiently discharge the moisture in the diaper 1 to the outside. In addition, in this embodiment, since the linear junction part SL is formed as the aggregate of the several junction part S arrange|positioned intermittently along the longitudinal direction of the diaper 1, the gap between junction|joint part S and adjacent The first air passages 111 communicate with each other. Therefore, it is possible to improve the air permeability between the adjacent first ventilation passages 111 , and it is difficult for the wearer to feel a local hot flush.

Furthermore, the air passage forming sheets 11F, 11R in this embodiment are provided with many fine air holes 11F1, 11R1 for air ventilation. Here, the air hole means an opening that communicates the space on one side of the sheet with the space on the other side, and its shape is not particularly limited. Therefore, as the air holes 11F1 and 11R1 , for example, openings having a shape such as a circle, an ellipse, or a polygon (triangular, square, or the like) can be applied. The formation of the air holes 11F1, 11R1 to the air passage forming sheets 11F, 11R does not mean that the air passage forming sheets 11F, 11R are not air-permeable materials, and the air passage forming sheets 11F, 11R may be air-permeable. The material may also be a material that does not have air permeability. The air passage forming sheets 11F and 11R are preferably made of an air-permeable and liquid-permeable material, but may also be made of an air-impermeable material, for example. The size and number of air holes 11F1 and 11R1 are not particularly limited, but for example, about 5 to 200 holes are preferably formed with an opening area of 0.5 to 10 mm ² .

As described above, in the diaper 1 of the present embodiment, the first constricted portion S1 on the side of the trunk opening 2T in the waist gather G2 assumes the moisture discharge function and the second constricted portion S2 assumes the position holding function of the diaper 1 ( Slip suppression function), the arrangement of the first linear rubber 4F1, 4R1 (first telescopic member) disposed on the first constricted part S1 and the second linear rubber 4F2, 4R2 disposed on the second constricted part S2 (the first 2 Telescopic members) are set in different ways. That is, by setting the distance A1 between the first linear rubbers 4F1 and 4R1 in the first constricted part S1 to be larger than the distance A2 between the second linear rubbers 4F2 and 4R2 in the second constricted part S2, both The moisture release function of the first constricted part S1 and the slip-off suppressing function of the second constricted part S2.

Furthermore, the inventors of the present invention conducted intensive studies and found that "by arranging the first linear rubbers 4F1 and 4R1 forming the first constricted portion S1 at a constant interval and setting the interval A1 to 6.5 mm or more, 20mm or less, the air permeability and ease of putting on and taking off of the waist gathers G2 in the diaper 1 can be improved compared with the past", especially, "from the improvement of the air permeability and the ease of putting on and taking off of the waist gathers G2 From a viewpoint, it is more preferable to set the interval A1 to be 6.5 mm or more and 13 mm or less." Hereinafter, the function effect of the diaper 1 of Embodiment 1 is demonstrated by comparing the diaper 1 of Embodiment 1 and the diaper 101 of a comparative example.

Fig. 5 is a diagram schematically showing a state in which the diaper 101 of the comparative example is unfolded. (A) of FIG. 5 has shown typically the internal structure in the case of seeing the diaper 101 at the time of unfolding from the left side. (B) of FIG. 5 schematically shows the planar structure of the diaper 101 when unfolded. The diaper 101 of the comparative example is the same as the diaper 1 of Embodiment 1 shown in FIG. Therefore, in the diaper 101 shown in FIG. 5, the same code|symbol as the diaper 1 is attached|subjected about the structure similar to the diaper 1, and the detailed description is abbreviate|omitted.

As shown in FIG. 5 , in the diaper 101 of the comparative example, the first linear rubbers 4F1 and 4R1 are provided so as to extend in the left-right direction along the trunk opening edges 4F9 and 4R9 of the cover sheets 4F and 4R. In the diaper 101 of the comparative example, five first linear rubbers 4F1 and 4R1 are arranged in parallel at a constant interval B1. Here, the distance B1 between the first linear rubbers 4F1 and 4R1 in the diaper 101 of the comparative example is set smaller than the distance A1 between the first linear rubbers 4F1 and 4R1 in the diaper 1 according to the first embodiment. For example, in the diaper 101 of the comparative example, the distance B1 between the first linear rubbers 4F1 and 4R1 is set to 5 mm.

Next, FIG. 6 is a diagram illustrating the gap B1 between the first linear rubbers 4F1 and 4R1 and the pleats formed in the first constricted portion S1 of the diaper 101 of the comparative example. (A) to (D) of FIG. 6 correspond to (A) to (D) of FIG. 4 , respectively. (A) of FIG. 6 is a figure which shows the state which looked at the waist gather G2 (1st contraction part S1) in the waist 1st region RW1 from the internal space side of the diaper 101 about the diaper 101 of a comparative example. Moreover, (B) of FIG. 6 is a figure which schematically shows the internal structure in the waist gather G2 (1st constriction part S1) in the waist 1st region RW1 when seeing from the side of the diaper 101. Moreover, (C) of FIG. 6 is a figure which shows the state which watched the waist 1st region RW1 from the upper direction of the diaper 101. As shown in FIG. (A) and (C) in FIG. 6 show the state before the waist gathers G2 (1st constriction part S1) in the waist 1st region RW1 shrink for convenience. In addition, (D) in FIG. 6 is a figure which showed the state which looked at the diaper 101 in the state which the waist gather G2 (1st contraction part S1) contracted from above.

As shown in FIG. 4(D) and FIG. 6(D), the first pleats 41 formed by shrinking the first shrinkage portion S1 of the waist gather G2 due to the contraction force of the first linear rubber 4F1, 4R1, The size of the second gathers 42 is larger in the diaper 1 of Embodiment 1 than in the diaper 101 of the comparative example. The reason for this is as follows.

FIG. 7A is a diagram illustrating gathers in the first constricted portion S1 of the waist gather G2 in Embodiment 1. FIG. (A) of FIG. 7A is a figure which shows typically the state which looked at the pleats in the 1st constricted part S1 of Embodiment 1 from the front. (B) of FIG. 7A is a figure which shows typically the state which looked at the pleats in the 1st constricted part S1 of Embodiment 1 from the side. Fig. 7B is a diagram illustrating gathers in the first constricted portion S1 of the waist gather G2 of the comparative example. (A) of FIG. 7B is a figure which shows typically the state which looked at the pleats in the 1st constricted part S1 of the comparative example from the front. (B) of FIG. 7B is a figure which shows typically the state which looked at the pleats in the 1st constricted part S1 of a comparative example from the side.

Here, the first linear rubbers 4F1, 4R1 provided on the first constricted portion S1 are bonded to the outer cover portions 4F10, 4R10 and the folded portions 4F5, 4R5 of the cover sheets 4F, 4R, so that they are formed on the first linear rubber. Among the first pleats 41 and the second pleats 42 of the cover sheets 4F and 4R between the rubbers 4F1 and 4R1, and the first pleats 113 and the second pleats 114 of the air passage forming sheets 11F and 11R, the distance from the first linear The closer the distance between the rubbers 4F1, 4R1, the higher the degree of restraint by the first linear rubbers 4F1, 4R1. On the other hand, in the diaper 1 of Embodiment 1, the distance A1 between the first linear rubbers 4F1 and 4R1 is wider than the distance B1 between the first linear rubbers 4F1 and 4R1 in the diaper 101 of the comparative example. Therefore, the first pleats 41 and the second pleats 42 of the cover sheets 4F and 4R of the diaper 1 according to Embodiment 1, and the first pleats 113 and the second pleats 114 of the air passage forming sheets 11F and 11R are compared with those of the diaper 101 of the comparative example. Overall, it is difficult to receive the binding force of the first linear rubbers 4F1 and 4R1. As a result, in the diaper 1 of Embodiment 1, compared with the diaper 101 of the comparative example, the first pleats 41 and the second pleats 42 of the cover sheets 4F, 4R, and the first pleats 113 and 113 of the air passage forming sheets 11F, 11R can be enlarged. 2nd pleat 114 .

As described above, according to the diaper 1 of the present embodiment, compared with the diaper 101 of the comparative example, the sizes of the first pleats 41 and the second pleats 42 formed in the first constricted portion S1 of the waist gather G2 can be increased. The ventilation area of the first ventilation passage 111 can be made larger. Moreover, according to the diaper 1 of this embodiment, compared with the diaper 101 of a comparative example, the size of the 1st pleats 113 and the 2nd pleats 114 formed in air passage forming sheet|seat 11F, 11R can be enlarged. Accordingly, the ventilation areas of the first air passage 111 and the second air passage 112 can be further increased. As mentioned above, according to the diaper 1 of embodiment, the moisture in the diaper 1 can be discharged|emitted more smoothly.

Moreover, the diaper 1 in this embodiment is compressed from the outside when the wearer changes from standing to sitting, and when the wearer walks, the diaper 1 is deformed by the movement of the legs. Therefore, the moisture in the diaper 1 can be discharged to the external space through the first air passage 111 and the second air passage 112, and the internal space of the diaper 1 can be made into a comfortable environment. In this way, the pump effect that promotes the discharge of moisture from the inside of the diaper with the compressive deformation of the diaper 1 is achieved by the first pleats 41 and the second pleats 42 that contribute to the enlargement of the cover panels 4F and 4R compared with the comparative example. Combining the first pleats 113 and the second pleats 114 of the air passage forming sheets 11F and 11R, and the arrangement of the first linear rubbers 4F1 and 4R1 in the first constricted portion S1, the air permeability that enables the waist gathers G2 to be obtained can be obtained. increase this synergy even more significantly.

In addition, in the diaper 1 of the present embodiment, the first constricted portion S1 forming the waist gather G2 extends from the trunk opening 2T extending in the longitudinal direction connecting the front body region 1F and the rear body region 1R. The length is set to be 26 mm or more and 31 mm or less. Thereby, there is the following advantage: when expanding the trunk opening 2T, the vicinity of the second joint of the finger is just hooked on the trunk opening edge 4F9, 4R9, so it is easy to expand when the wearer puts on or takes off the diaper 1 conversely. Open the trunk opening 2T. More specifically, when the parts of the fingers closer to the fingertip side than the first joint are located at the trunk opening end edges 4F9 and 4R9 when the trunk opening 2T is expanded, the fingertips can easily fall from the trunk opening 2T in the process of expanding the trunk opening 2T. The torso opening end edges 4F9, 4R9 are accidentally detached. On the other hand, when the part of the base of the finger deeper than the second joint is located at the end edges 4F9 and 4R9 of the trunk opening when the trunk opening 2T is expanded, the second constriction located below the first contraction part S1 The portion S2 expands, and it tends to become difficult to efficiently expand the trunk opening 2T. On the other hand, the ease of putting on and taking off the diaper 1 can be improved by setting the extension length of the 1st contraction part S1 along the longitudinal direction of a diaper to 26 mm or more and 31 mm or less. In addition, there is also an advantage that when the diaper 1 is opened, the tips of the fingers do not sink into the air passage forming sheets 11F, 11R forming the skin contact surface of the waist gather G2 of the diaper 1, and the air passage forming sheets 11F and 11R can be suppressed. 11F, 11R damaged.

Moreover, in the diaper 1 in this embodiment, the 1st contracted part S1 has the laminated structure which laminated|stacked sheet members in at least 3 layers. Thereby, even when the operator's finger enters between the first linear rubbers 4F1 and 4R1 disposed on the first constricted part S1 when the baby (wearer) puts on the diaper 1, it is possible to suppress the formation of the diaper. The cover pieces 4F, 4R of the first constricted portion S1 are cracked.

In addition, in the diaper 1 of the present embodiment, since the distance A2 between the second linear rubbers 4F2 and 4R2 in the second constricted portion S2 forming the waist gather G2 is set to be smaller than the distance A2 between the second linear rubbers 4F2 and 4R2 in the first constricted portion S1, 1 Since the distance A1 between the linear rubbers 4F1 and 4R1 is small in size, the second constricted portion S2 can appropriately exhibit a slip-off suppressing function for suppressing slip-off of the diaper 1 . That is, the waist gathers G2 as a whole can exhibit the moisture discharge function of discharging the moisture in the internal space of the diaper 1 to the outside, and can also suitably suppress the slipping of the diaper 1 .

Moreover, in the diaper 1 of this embodiment, it is preferable that the width dimension which the 2nd constricted part S2 extends in the diaper longitudinal direction (direction orthogonal to the trunk direction) shall be 10 mm or more. By setting the extension width of the 2nd constricted part S2 as mentioned above, when a handler puts the diaper 1 on a wearer, it becomes easy to suppress that the 2nd constricted part S2 sinks into the wearer's skin. Moreover, in the diaper 1 of this embodiment, it is preferable that the extension width of the diaper longitudinal direction of the 2nd contraction|contraction part S2 shall be 26 mm or less. Thus, there is an advantage in that the wearer's navel is less likely to be covered by the waist gathers G2 when the diaper 1 is worn, so that the wearer is less likely to receive an excessive sense of pressure.

<test result>

Hereinafter, a diaper corresponding to one example of the diaper 1 of the above-mentioned embodiment and a diaper corresponding to the diaper 101 of the above-mentioned comparative example were prepared, and each diaper was subjected to an air permeability quantitative test, a mist air permeation test, a widening strength test, and the like. Hereinafter, a diaper corresponding to one example of the diaper 1 of the embodiment is referred to as an "Example", and a diaper corresponding to the diaper 101 of the above-mentioned comparative example is referred to as a "Comparative Example".

〔Permeability quantitative test〕

First, an air permeability quantitative test for Examples and Comparative Examples will be described. Fig. 8 is a diagram illustrating wind speed measurement positions in an air permeability quantitative test. As a test condition, a diaper to be tested was worn on a dummy, and the speed (wind speed) of the air discharged from the inside of the diaper to the outside when 20 L/min of air was sprayed from the crotch of the dummy was measured using an anemometer. Determination. For the measurement of the wind speed, a commercially available hot wire anemometer (manufactured by Testo Co., Ltd. (Japanese: Testo Co., Ltd.), product number: testo425, wind speed resolution: 0.01 m/s) was used.

Table 1 shows various specifications of Examples and Comparative Examples. About the number of samples used for a test, about Examples 1-3 and Comparative Examples 1-3, three kinds of each of Big size, L size, and M size were prepared for each size. In addition, the type, number, and interval of the first linear rubbers 4F1 and 4R1 forming the first constricted portion S1 in the waist gather G2 depend on the draft ratio (Japanese: draft ratio) for each size of the example and the comparative example. ) are shown in the table. In addition, as shown in Table 1, for Examples 1 to 3 and Comparative Examples 1 and 2, specifications in which an air passage forming sheet is provided on the waist gather G2 are set. On the other hand, Comparative Example 3 is a specification in which no air passage forming sheet is provided on the waist gathers G2.

[Table 1]

In addition, in the air permeability quantitative test, as shown in FIG. 8, at the center of the width direction of the back body region of the diaper, it is measured at 5 locations A to E with different separation distances in the vertical direction from the edge of the trunk opening. up the wind speed. In addition, the up-down direction mentioned here means the direction orthogonal to the width direction along the exterior surface of a diaper. The measurement position A was set at a position 1 cm above the opening edge of the trunk. In addition, as shown in FIG. 8 , measurement positions B to E are located below the trunk opening edge, and the separation distances from the trunk opening edge are set to 0.5 cm, 1.5 cm, 2.5 cm, and 3.5 cm, respectively.

In addition, at measurement positions B to E, the probe of the anemometer was held in a vertical posture with respect to the exterior surface (cover surface) of the diaper, and the wind velocity was measured in a state where the tip of the probe faced the exterior surface of the diaper. On the other hand, as for the measurement position A, the probe of the anemometer is held in a posture along the back of the dummy, and the tip of the probe faces the gap between the back of the dummy and the waist gathers of the diaper. The wind speed measurement was carried out under the condition.

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

[Table 2]

Regarding the measurement position A, it is considered that the flow of air leaking out from the gap between the waist gathers G2 and the skin of the dummy is dominant. Then, regarding each embodiment and each comparative example, if the measurement result of the wind speed at the measurement position A is considered, as shown in Table 2, embodiment 1 (linear rubber interval 6.5mm), embodiment 2 (linear rubber interval 6.5mm), embodiment 2 (linear The rubber interval is 13mm), Example 3 (the linear rubber interval is 20mm), and the wind speed is significantly increased compared with Comparative Example 1 (the linear rubber interval is 5mm), and Comparative Example 3 (the linear rubber interval is 5mm, and there is no air passage forming sheet). one result. Therefore, compared with Comparative Examples 1 and 3, it can be said that the air permeability of the waist gathers G2 is significantly improved in Examples 1-3. In addition, it can be evaluated that the air permeability of the waist gathers G2 can be improved by ensuring the distance between the first linear rubbers 4F1 and 4R1 forming the first constricted portion S1 in the waist gathers G2 to be 6.5 mm or more. In addition, regarding the measurement positions B to E, no significant difference was seen between each Example and each Comparative Example.

Here, in Table 2, the sensory evaluation results related to the ease of putting on and taking off (ease of putting on and taking off) of Examples and Comparative Examples are collectively shown. The sensory evaluation was evaluated by 5 evaluators. Out of 5 evaluators, 4 or more gave a good answer, △ when 3 gave a good answer, and x when 2 or less gave a good answer. In Comparative Example 1 and Comparative Example 3 in which the distance between the linear rubbers in the waist gathers G2 was set to 5 mm, the shrinkage force of the linear rubbers in the waist gathers G2 was high, and the waist gathers were stretched when the diaper was worn. The linear rubber of G2 requires a large force. On the other hand, when the linear rubber of the waist gather G2 was stretched when the linear rubber of the waist gather G2 was stretched when the diaper was worn in Examples 1 to 3, the distance between the linear rubber in the waist gather G2 was obtained. Compared with Comparative Examples 1 and 3, it does not require a large force and is easy to pull up".

On the other hand, in Comparative Example 2 in which the distance between the linear rubbers in the waist gather G2 was set to 25 mm, the distance between the linear rubbers was too wide, so fingers were not caught and it was difficult to pull them up. From this, it can be said that the distance between the linear rubbers of the waist gather G2 is preferably 20 mm or less from the viewpoint of the ease of putting on and taking off the diaper. In addition, it can be seen that in Comparative Example 2, the air permeability of the waist gathers G2 is approximately the same as that of Examples 1 to 3, but the ease of putting on and taking off the diaper is inferior to that of Examples 1 to 3 in Comparative Example 2. . Based on the above, it can be evaluated that, when comprehensively judged from the viewpoint of the air permeability of the waist gather G2 and the ease of putting on and taking off the diaper, it is preferable to form the first contraction portion S1 in the waist gather G2. The distance between the linear rubbers 4F1 and 4R1 is set to be 6.5 mm or more and 20 mm or less.

In addition, when comparing the various examples, it is obtained that "the breathability 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 (the linear rubber interval of 20mm) compared with Example 1 (linear rubber interval 20 mm) Rubber interval 6.5mm) and Example 2 (linear rubber interval 13mm) are more excellent" result. From this, it can be said that from the viewpoint of improving the air permeability of the waist gathers G2 and the ease of putting on and taking off, it is particularly preferable to use the first linear rubbers 4F1, 4R1 that form the first constricted portion S1 in the waist gathers G2. The interval is set to be 6.5 mm or more and 13 mm or less.

〔Fog ventilation test〕

Next, the test conditions and results of the mist air permeation test of Examples and Comparative Examples will be described. In the mist air-permeable test, use the mist air-permeable tester 200 shown in Fig. 9, wear the diaper of the test object (embodiment 1, comparative example 1) to the diaper wearing part 202 that has the mist outlet 201, visually observe the diaper of the test object (embodiment 1, comparative example 1). The state of the mist passing through the waist gathers of the diaper to the outside when the mist ejection port 201 continuously sends out air (flow rate: 5 m/min) containing a certain amount of mist for 15 seconds. In addition, the mist outlet 201 has a rectangular shape with a vertical dimension of 25 mm and a lateral dimension of 25 mm, and the mist air permeability test was performed on the diaper wearing part 202 with the waist gathers G2 positioned on the front of the mist outlet 201 . In FIG. 9, the state which sprayed mist from the mist discharge port 201 in the state which did not put a diaper on the diaper wearing part 202 is shown.

Here, the number of samples used for the mist air permeation test was prepared three for each size (Big size, L size, M size) of Example 1 and Comparative Example 1. Table 3 shows the results of the mist air permeation test for the L size and the Big size. In addition, Table 4 shows the results of the mist air permeation test for the M size. From the results of the mist air permeation test of Example 1 and Comparative Example 1, it can be seen that the amount of mist leaking from the waist gathers in the longitudinal direction is larger in Example 1 than in Comparative Example 1. Here, compared with Comparative Example 1, in Example 1, the distance between the first linear rubbers 4F1 and 4R1 forming the first constricted portion S1 in the waist gather G2 is wider, so that the first constricted portion S1 can be Create larger pleats. As a result, it can be considered that the amount of mist discharged from the air passage formed between the waist gathers G2 and the diaper wearing portion 202 is comparable to that of Comparative Example 1 due to the synergistic effect with the waist groove structure including the air passage forming sheet. Compared with Example 1, the air permeability of the waist gathers G2 is improved.

[table 3]

[Table 4]

〔Enlarged photo of waist pleating〕

Fig. 10A is an enlarged photograph of the pleats forming the waist gather of the example. Fig. 10B is an enlarged photograph of pleats forming a waist gather of a comparative example. Comparing the examples and the comparative examples shows that the size of the pleats forming the waist gathers is larger in the examples than in the comparative examples. That is, it can be said that the gas permeability of the waist gathers is more excellent in the Examples than in the Comparative Examples.

Next, the diaper of this embodiment is further demonstrated. In the diaper 1 of this embodiment, the first constricted portion S1 includes first linear rubbers 4F1, 4R1 provided in the first waist region RW1 close to the trunk opening edges 4F9, 4R9 and extending in the direction around the trunk. Make the trunk opening shrink in the direction around the trunk. The second constricted portion S2 includes second linear rubbers 4F2, 4R2 provided in the second waist region RW2 adjacent to the crotch region 1B side with respect to the first constricted portion S1 and extending in the direction around the trunk, and opens the trunk. The neck contracts in a direction around the torso. In addition, in the diaper 1 of the present embodiment, the first constricted portion S1 forming the waist gather G2 extends from the trunk opening 2T extending in the longitudinal direction connecting the front body region 1F and the rear body region 1R. The length is set to be 26 mm or more and 31 mm or less. Thereby, there is the following advantage: when expanding the trunk opening 2T, the vicinity of the second joint of the finger is just hooked on the trunk opening edge 4F9, 4R9, so it is easy to expand when the wearer puts on or takes off the diaper 1 conversely. Open the trunk opening 2T. More specifically, when the parts of the fingers closer to the fingertip side than the first joint are located at the trunk opening end edges 4F9 and 4R9 when the trunk opening 2T is expanded, the fingertips can easily fall from the trunk opening 2T in the process of expanding the trunk opening 2T. The torso opening end edges 4F9, 4R9 are accidentally detached. On the other hand, when the part of the base of the finger deeper than the second joint is located at the end edges 4F9 and 4R9 of the trunk opening when the trunk opening 2T is expanded, the second constriction located below the first constriction S1 The portion S2 expands, and it tends to become difficult to efficiently expand the trunk opening 2T. On the other hand, the ease of putting on and taking off the diaper 1 can be improved by setting the extension length of the 1st contraction part S1 along the longitudinal direction of the diaper 1 to 26 mm or more and 31 mm or less. In addition, the force (expansion strength) required to expand the first constricted portion S1 in the lateral direction is smaller than that of the second constricted portion S2. Thereby, the ease of putting on and taking off the diaper 1 can be further improved. In addition, there is also an advantage that when the diaper 1 is spread, the tips of the fingers do not sink into the air passage forming sheets 11F, 11R forming the skin contact surface of the waist gather G2 of the diaper 1, and the air passage forming sheet 11F can be suppressed. , 11R damaged.

Moreover, in the diaper 1 in this embodiment, the 1st contracted part S1 has the laminated structure which laminated|stacked sheet members in at least 3 layers. Thereby, even when the operator's finger enters between the linear rubbers 4F1 and 4R1 disposed on the first constricted part S1 when the baby (wearer) puts on the diaper 1, it is possible to suppress the formation of the first constriction. The cover pieces 4F, 4R of the constricted portion S1 are cracked.

In addition, in the diaper 1 according to the present embodiment, the linear rubbers 4F2 and 4R2 in the second constricted portion S2 forming the waist gather G2 are arranged in parallel with a predetermined interval (hereinafter referred to as "interval A2"). There are 4. Since the distance A2 is set to be smaller than the distance A1 between the linear rubbers 4F1 and 4R1 in the first constricted portion S1, the second constricted portion S2 can suitably exhibit a slipping suppression function for suppressing the diaper 1 from slipping. That is, the waist gathers G2 as a whole can exhibit the moisture discharge function of discharging the moisture in the internal space of the diaper 1 to the outside, and can also suitably suppress the slipping of the diaper 1 .

Moreover, in the diaper 1 of this embodiment, it is preferable that the width dimension which the 2nd constricted part S2 extends in the diaper longitudinal direction (direction orthogonal to the trunk direction) shall be 20 mm or more. By setting the extension width of the 2nd constricted part S2 as mentioned above, when a handler puts the diaper 1 on a wearer, it becomes easy to suppress that the 2nd constricted part S2 sinks into the wearer's skin. Moreover, in the diaper 1 of this embodiment, it is preferable that the extension width of the 2nd contraction part S2 in the diaper longitudinal direction shall be 40 mm or less. For example, when the range from the trunk opening edge 4F9, 4R9 extending in the longitudinal direction of the first constricted portion S1 is 31 mm, the second constricted portion S2 extending in the longitudinal direction from the trunk opening edge 4F9, 4R9 The starting range is more than 31mm and less than 71mm. In addition, when the range from the trunk opening edge 4F9, 4R9 extending in the longitudinal direction of the first constricted portion S1 is 26 mm, the second constricted portion S2 extending in the longitudinal direction from the trunk opening edge 4F9, 4R9 The starting range is more than 26mm and less than 66mm. That is, the width dimension of the second constricted portion S2 extending in the longitudinal direction of the diaper is not less than 20 mm and not more than 40 mm, and the range of the second constricted portion S2 extending in the longitudinal direction from the trunk opening edges 4F9 and 4R9 is not less than 26 mm and not more than 71 mm. the following. In this case, the first constricted portion S1 and the second constricted portion S2 may be adjacent to each other. Thus, the diaper 1 can make the second constricted portion S2 correspond to the pelvis abutting position on the pelvis of the wearer (for example, a baby), and the linear rubber 4F2 can be located where the left and right ends of the wearer's pelvis are located. In the vicinity of the part, the second constricted part S2 is held at the waist of the wearer.

<experiment>

Hereinafter, a diaper corresponding to an example of the diaper 1 of the present embodiment and a diaper corresponding to the diaper 101 of the comparative example in the same manner as above were prepared, and the slipping suppression function of the diaper was evaluated. Hereinafter, the diaper corresponding to the trial product which is an example of the diaper 1 of Embodiment 1 is called an "example". In addition, the diaper of the comparative product corresponding to the diaper 101 of the said comparative example is called a "comparative example" below.

In this experiment, "ROICA (Japanese: ロイカ) HS 470dtex" was used as the thread rubber corresponding to the thread rubbers 4F2 and 4R2, and "ROICA CR 470dtex" was used as the thread rubber 4F3 corresponding to both the examples and the comparative examples. , 4R3, 4F4, 4R4 linear rubber. In the examples, the stretch ratio of the thread rubber corresponding to the thread rubber 4F2 and 4R2 is 345%, and the stretch ratio of the thread rubber corresponding to the thread rubber 4F3 and 4R3 is 315%, which is equivalent to the thread rubber The elongation rate of the linear rubber of 4F4 and 4R4 was 330%. In the comparative example, the stretching ratio of the linear rubbers corresponding to the linear rubbers 4F2 and 4R2 was 345%, and the stretching ratios of the linear rubbers corresponding to the linear rubbers 4F3 and 4R3 were 285%, corresponding to the linear rubbers 4F3 and 4R3. The elongation ratio of the linear rubber of 4F4 and 4R4 was 285%.

<Experiment 1>

In Experiment 1, five subjects A to E of infants and young children were made to wear the diapers of Examples and Comparative Examples and play freely for 2 hours, and the slippage of the diapers was confirmed. Table 5 shown below shows the results of Experiment 1. In addition, in the column of "abdominal circumference (cm)" in Table 5, the size of the abdominal circumference of each subject is described.

[table 5]

Abdominal circumference (cm) Example comparative example Subject A 48 ○ △ Subject B 46 ○ △ Subject C 44 △ △ Subject D 43 △ x Subject E 42 △ x

In Table 5, the symbol "◯" described in the column of "Example" indicates the result of no slipping. In addition, the symbol "Δ" described in the column of "Example" and "Comparative example" shows the result that there was almost no slippage. In addition, the symbol "x" described in the column of "comparative example" shows the result which slipped. As shown in Table 5, the diapers of the Examples had a higher slip-off suppression function than the diapers of the Comparative Examples.

<Experiment 2>

In Experiment 2, an evaluation was made regarding the slipping suppression function when the baby crawled (Japanese: ずりばい). Specifically, a dummy in a sitting position wearing a diaper was placed on an EVA (ethylene-vinylacetate copolymer: ethylene-vinyl acetate copolymer) mat, and the diaper was made to absorb and retain 150 cc of artificial urine. The dummy is 4 kg in weight and is size equivalent to the L size of the baby. Artificial urine was prepared by dissolving 20 g of urea, 8 g of sodium chloride, 0.8 g of magnesium sulfate heptahydrate, and 0.3 g of calcium chloride dihydrate in 1000 mL of distilled water.

Mark the abdomen of the dummy (Japanese: お头周り) and the upper end of the side abdomen, and make the dummy slide 5cm forward and backward on the EVA mat 60 times in 1 minute. Slipping of the diaper on the flank was confirmed.

In the diaper of the example, the sliding width at the stomach was 5 cm, and the sliding width at the side was 0 cm. On the other hand, in the diaper of the comparative example, the sliding width at the stomach was 20 cm, and the sliding width at the flank was 10 cm. Thus, the diapers of the examples have a higher slip-off suppression function than the diapers of the comparative examples. Thereby, even when the wearer's baby crawls, the diaper 1 can be suppressed from slipping down. As described above, the diaper 1 of this embodiment is easy to put on and take off, and can suppress slipping. Therefore, the diaper 1 of this embodiment is suitable for babies before both legs walk.

<Embodiment 2>

Next, the diaper of Embodiment 2 is demonstrated. The diaper 1 of this embodiment has the same structural element as the diaper of Embodiment 1 mentioned above. In addition, in this embodiment, the same reference numerals are assigned to the same configurations as those in the first embodiment described above, and detailed description thereof will be omitted.

Fig. 11 is a diagram schematically showing a state in which the diaper 1 according to Embodiment 2 is unfolded and stretched. (A) of FIG. 11 has shown typically the internal structure at the time of seeing the diaper 1 of the unfolded and stretched state from the left side. (B) of FIG. 11 schematically shows a plan view of the diaper 1 in an unfolded and stretched state.

In the diaper 1 of this embodiment, the end part of the longitudinal direction of the absorber 8 is in contact with the 1st contracted part S1. In other words, the longitudinal end of the absorber 8 extends to the end of the first constricted portion S1. Thereby, the moisture from the absorber 8 that has absorbed the liquid can be efficiently discharged to the outside through the first air passage 111 and the second air passage 112 formed by the contraction of the first constricted portion S1.

In addition, in the diaper 1 of the present embodiment, the first constricted portion S1 includes the first linear rubbers 4F1, 4R1 provided in the first waist region RW1 close to the trunk opening edges 4F9, 4R9 and extending in the direction around the trunk. , and make the trunk opening shrink in the direction around the trunk. The second constricted portion S2 includes second linear rubbers 4F2, 4R2 provided in the second waist region RW2 adjacent to the crotch region 1B side with respect to the first constricted portion S1 and extending in the direction around the trunk, and opens the trunk. The neck contracts around the torso. When the diaper 1 of this embodiment is planarly viewed, the longitudinal direction end part of the absorber 8 overlaps with the 2nd contraction|contraction part S2. The range where the 2nd constriction part S2 extends in the longitudinal direction of the diaper 1 is 15 mm, and the space|interval A2 of 2nd linear rubber|gum 4F2, 4R2 is 5 mm or more and 7 mm or less. In addition, in the second constricted portion S2, the absorber 8 and the second linear rubbers 4F2, 4R2 may be arranged with a sheet member (for example, the back sheet 7) in between, or may be in contact with each other.

[Experimental example]

Also in this embodiment, the same experiment as the air permeability quantitative test in Embodiment 1 above was performed.

Table 6 shows the results of the air permeability quantitative test. In Table 6, the column of "measurement position" shows the same measurement positions A to E (see FIG. 8 ) as in Embodiment 1 above, and the row of the measurement positions A to E shows the wind speed (m/s) at each measurement position. ). In addition, in this experimental example, the comparative example 1 and Example 4 produced the diapers of three sizes, M size, L size, and Big size.

[Table 6]

As shown in Table 6, at the measurement position A, the result that the wind speed was significantly increased in Example 4 (0.24 m/s) compared with Comparative Example 1 (0.02 m/s) was obtained. On the other hand, no significant difference was seen between Example 4 and Comparative Example 1 regarding the measurement positions B to E. Regarding the measurement position A, it is considered that the flow of air leaking out from the gap between the waist gathers G2 and the skin of the dummy is dominant. Therefore, it can be said that the air permeability of the waist gathers G2 in Example 4 in which the wind speed at the measurement position A was significantly increased compared with Comparative Example 1 was significantly improved compared with Comparative Example.

In addition, the number of sheet members forming the second constricted portion S2 is greater than the number of sheet members forming the first constricted portion S1. The first constricted portion S1 is formed of a total of three sheet members of the cover sheets 4F, 4R, the folded portions 4F5, 4R5, and the air passage forming sheets 11F, 11R. The second constricted portion S2 consists of cover sheets 4F, 4R, inner cover sheets 5F, 5R, pad cover sheet 6, back sheet 7, central sheet 9, folded portions 4F5, 4R5, and air passage forming sheets 11F, 11R, which total 7 A sheet member is formed. Furthermore, the second constricted portion S2 includes the absorber 8 . Therefore, the stiffness of the second constricted portion S2 is greater than that of the first constricted portion S1.

The first constricted portion S1 has a moisture discharge function of discharging moisture in the internal space of the diaper 1 to the outside, and a function of easily expanding the trunk opening 2T. On the other hand, the second constricted portion S2 of the waist gathers G2 assumes a position holding function (slip suppression function) for suppressing slipping when the diaper 1 is worn by increasing the contraction force in the direction around the trunk compared with the first constricted portion S1. ). In addition, by making the rigidity of the second constricted portion S2 greater than that of the first constricted portion S1, the first pleats 41 and the second pleats 42 of the cover sheets 4F and 4R shown in FIG. 4 and the air passage forming sheets 11F and 11R can be enlarged. The first pleats 113 and the second pleats 114 can increase the size of the first air passage 111 and the second air passage 112 .

<experiment>

Hereinafter, a diaper corresponding to an example of the diaper 1 of Embodiment 2 and a diaper corresponding to the diaper 101 of the comparative example in the above-mentioned Embodiment 1 were prepared, and the slipping suppression function of the diaper was evaluated. Hereinafter, the diaper corresponding to the trial product which is an example of the diaper 1 of Embodiment 2 is called "Example 4". In addition, the diaper of the comparative product corresponding to the diaper 101 of the said comparative example is called "comparative example 1" below. In addition, in Example 4 and Comparative Example 1, baby diapers were also produced.

In this experiment, "ROICA HS 470dtex" was used as the thread rubber corresponding to the first thread rubbers 4F1 and 4R1 for both Example 4 and Comparative Example 1, and "ROICA CR 470dtex" was used as the thread rubber equivalent to the second thread rubber. The linear rubbers of 4F2, 4R2, and the third linear rubbers 4F3 and 4R3. In Example 4, the draft ratio of the linear rubbers corresponding to the first linear rubbers 4F1 and 4R1 was 330% in the M dimension and 345% in the L dimension. On the other hand, in Comparative Example 1, the draft ratio of the linear rubbers corresponding to the first linear rubbers 4F1 and 4R1 was 315% regardless of the size. In addition, in both Example 4 and Comparative Example 1, the draft ratio of the linear rubbers corresponding to the second linear rubbers 4F2 and 4R2 was 315% regardless of the size. In addition, in both Example 4 and Comparative Example 1, the draft ratio of the linear rubbers corresponding to the third linear rubbers 4F3 and 4R3 was 330% regardless of the size.

Table 7 summarizes the distances between the linear rubber in the first constricted part and the absorber 8 in the second constricted part in Comparative Example 1 and Example 4, and the first constricted part.

[Table 7]

In addition, in Example 4 and Comparative Example 1, the rigidity of portions corresponding to the first constricted portion S1 and the second constricted portion S2 was measured. This measurement is performed by the stiffness measurement of the cantilever according to JIS L1069. In Example 4, the stiffness of the portion corresponding to the first constricted portion S1 was 61 mmN, and the stiffness of the portion corresponding to the second constricted portion S2 was 112 mmN. The smaller the numerical value of the stiffness, the easier it is to bend. In Example 4, the second constricted part is less likely to bend than the first constricted part, and the pleats become larger. Regarding the number of pleats, the second linear rubbers 4F2 and 4R2 were cut at a width of 5 cm while being stretched near the center, and the number of pleats and the average pleat height were measured in the contracted state. In Comparative Example 1, there were 9 lines (average pleat height: 1.3 mm), whereas in Example 4, the number of lines was 6 (average pleat height: 2 mm). When comparing the cross-sectional area of the pleats used as an index of air permeability, it was 16.25 mm ² in Comparative Example 1, but it was 25 mm ² in Example 4. Compared with Comparative Example 1, the cross-sectional area of Example 4 was increased by about 1.5 times.

In addition, in Example 4 and Comparative Example 1, the expansion strength of portions corresponding to the first constricted portion S1 and the second constricted portion S2 was measured.

〔Broadening strength test〕

The widening strength test of Example 4 and Comparative Example 1 will be described. Here, with respect to each of Example 4 and Comparative Example 1, the expansion strength in the range where the first constricted portion and the second constricted portion in the waist gather were combined during the expansion deformation of the trunk opening was measured. . In addition, the widening strength test was implemented for Example 4 and Comparative Example 1 for three types of Big size, L size, and M size, respectively. In both Example 4 and Comparative Example 1, five second constricted portions S2 at intervals of 7 mm were set for M size, and four second linear rubbers were set at intervals of 5 mm for L size and Big size.

The ring-shaped test piece produced as above was hooked to the upper and lower grips of a STROGRAPH (Japanese: ストロュラフ) tensile testing machine (manufactured by Toyo Seiki Co., Ltd., product number: YG1E), respectively. The clamps of the head are installed, and the reaction force when the test piece is widened and deformed by gradually increasing the separation distance between the upper and lower chuck parts is measured by a load cell, and the values in Example 4 and Comparative Example 1 are obtained. The expansion strength of the second constriction (contraction force in the direction around the trunk). Here, the speed when increasing the distance between the upper and lower chuck parts was set to 200 mm/min. In addition, the widening strength of the M-sized 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. In addition, the widening strength of the L size and Big size test pieces was calculated as the average value of the measurement results measured when the separation distances between the upper and lower chuck parts were 38 cm, 48 cm, and 62 cm.

Table 8 shows the results of the broadening strength test for Example 4 and Comparative Example 1.

[Table 8]

As shown in Table 8, the average value of the widening strength at the widening width of 44 cm of each test piece prepared in Comparative Example 1 was 2.6N for the M size and Big size, and 2.8N for the L size. Here, the average value of the widening strength at the widening width of 44 cm of each test piece produced in Example 4 was 2.4N in the M size and the Big size, and 2.5N in the L size. From the point of view of making the second constricted part in the waist gathers bear the slip suppression function of preventing the diaper from slipping off the wearer, the expansion strength of the second constricted part is preferably 1.4N or more and 3.4N in the M size and the Big size. Hereinafter, in the L dimension, it is 1.5N or more and 3.5N or less, and the expansion strength of Example 4 is included in the above-mentioned adaptability range, and it was also confirmed from this that the Example can fully exhibit the slipping suppression function of the diaper.

<Embodiment 3>

Next, the diaper of Embodiment 3 is demonstrated. The diaper 1 of this embodiment has the same structural element as the diaper of Embodiment 1 mentioned above. In addition, in this embodiment, the same reference numerals are assigned to the same configurations as those in the first embodiment described above, and detailed description thereof will be omitted.

In the diaper 1 of the present embodiment, a space is formed between the center sheet 9 (an example of a "skin side sheet member") and the wearer's skin in a region overlapping with the vicinity of the longitudinal ends of the absorber 8 when worn. "Characteristic. In addition, the center sheet 9 is a sheet member that is laminated on the absorber 8 to form a skin-facing surface.

Next, a configuration example having the space described above will be described using FIG. 12 . Fig. 12 is a diagram schematically showing a state in which the diaper 1 according to Embodiment 3 is unfolded and stretched. (A) of FIG. 12 has schematically shown the internal structure at the time of seeing the diaper 1 of the unfolded and stretched state from the left side. (B) of FIG. 12 schematically shows a plan view of the diaper 1 in an unfolded and stretched state.

The diapar 1 of this embodiment is formed with the bending line 50F, 50R which becomes convex toward the end part direction in the area|region which overlaps with the longitudinal direction end part vicinity of the absorber 8 in planar view. The bending lines 50F and 50R may be formed on the absorber 8 or may be formed on the center sheet 9 . The bending lines 50F and 50R may be squeezed grooves formed in the absorber 8 or the center sheet 9 . In addition, regarding the bending lines 50F and 50R, the central sheet 9 may be formed by two sheet members, and may be formed by embossing (3D embossing) formed at the bonded portion of the two sheet members.

The diaper 1 can form a space between the central sheet 9 and the wearer's skin so that the longitudinal end portions of the absorber 8 are bent by the bending lines 50F and 50R when worn. The diaper 1 can cause the moisture from the absorber 8 that has absorbed the liquid to flow to the first air passage 111 and the second air passage 112 through the space, and can efficiently discharge the moisture to the outside. Thus, the air permeability of the diaper 1 of this embodiment becomes favorable.

In addition, in the diaper 1 , the above-mentioned space may be formed by adhering linear rubber in an extended state to the longitudinal end of the absorber 8 .

<Embodiment 4>

Next, the diaper of Embodiment 4 is demonstrated.

When the absorbent article is worn, moisture generated from urine, body fluid, etc. absorbed in the absorbent body tends to stay in the inner space of the absorbent article (the space formed between the wearer's skin and the skin-contacting surface of the absorbent article). space), and this moisture becomes a cause of skin problems such as skin rashes, and also a cause of discomfort such as hot flashes and stickiness, so it is not preferable.

Then, when the absorbent article is worn, various proposals for improving the air permeability of the absorbent article have been made in order to discharge the moisture remaining in the inner space of the absorbent article to the outside (for example, refer to Japanese Patent No. 5573806 bulletin, etc.). For example, there is known a disposable diaper in which an outer layer sheet and an inner layer sheet are contracted in the waist circumferential direction by an elastic member to form pleats around the waist, and moisture is discharged to the outside from the gap between the pleats and the wearer's skin.

Although various proposals have been made for improving the air permeability of absorbent articles as described above, provision of absorbent articles with higher air permeability is actually desired. Therefore, one of the objects of this embodiment is to provide an absorbent article with better air permeability than conventional ones.

In order to solve the above-mentioned problems, the absorbent article according to the present embodiment has a front body area covering the abdomen of the wearer, a rear body area covering the wearer's back, and an absorbent article located between the front body area and the rear body area. An absorbent article in which the crotch region of the absorber is continuously arranged, and includes: a trunk opening lower constriction portion that includes the wearer's torso in the front body region and the rear body region; A plurality of telescopic members extending along the direction around the torso at least from the position corresponding to the waist bone of the wearer at the opening of the trunk through which the entire body is inserted, and make the opening of the trunk contract in the direction around the torso; and the upper side of the opening of the trunk shrinks The upper constriction part of the trunk opening includes a plurality of telescopic members extending along the direction around the torso between the end edge of the opening of the trunk opening and the lower constriction of the trunk opening, and makes the trunk opening in the direction around the torso In the upper contraction, the distance between the plurality of telescopic members included in the trunk opening lower side contraction portion is larger than the interval between the plurality of telescopic members included in the trunk opening upper side contraction portion.

In addition, the distance between the plurality of telescopic members included in the trunk opening lower constriction may be 6.5 mm or more and 12 mm or less.

In addition, the lower constricted portion of the trunk opening may be provided in a region including a distance between 20 mm and 40 mm from the edge of the opening.

In addition, an air passage forming sheet may be further provided so as to cover the skin-facing surfaces of the upper constricted portion of the trunk opening and the lower constricted portion of the trunk opening. A plurality of junctions are intermittently arranged in the direction of the trunk, and the contraction of the upper constriction of the trunk opening and the lower constriction of the trunk opening causes the non-joint areas between the junctions to bend and deform into waves, thereby forming Ventilation way.

In addition, it may be further provided with an opening edge side constriction, and the opening end edge side constriction includes a direction around the trunk along the opening edge between the opening edge and the trunk opening upper side constriction. A plurality of telescopic members extended above, and make the trunk opening shrink in the direction around the trunk, and the distance between the plurality of telescopic members in the edge side constriction of the opening is greater than that in the upper constriction of the trunk opening. The distance between the two telescopic members is large.

In addition, it may be provided with a cover sheet that wraps the telescopic member included in the upper constricted portion of the trunk opening in the portion forming the trunk opening, the cover sheet is folded at the edge of the opening, and the folded portion of the folded portion The scar has continuous air holes through the cover sheet.

According to the absorbent article of the present embodiment, better air permeability than conventional ones can be obtained.

Embodiment 4 of the present invention will be described below. Embodiment shown below is an example of embodiment of this invention, and does not limit the technical scope of this invention to the following form.

Fig. 13 is a perspective view of a pull-on disposable diaper (hereinafter, simply referred to as "diaper") 1 according to Embodiment 4. As shown in FIG. FIG. 14 is an exploded perspective view of a diaper 1 according to Embodiment 4. FIG. In addition, FIG. 15 is a figure which shows typically the state which expanded the diaper 1 of embodiment. (A) of FIG. 15 has shown typically the internal structure at the time of seeing the diaper 1 at the time of unfolding from the left side. (B) of FIG. 15 has schematically shown the planar structure of the diaper 1 at the time of unfolding.

The term related to the direction used in this specification means the direction which matches the front, rear, left, and right of the wearer in the state where the diaper 1 is worn on the wearer. For example, when referring to the left-right direction in this specification, it means the direction which matches the right and left of the wearer in the state where the diaper 1 is worn on the wearer.

In addition, in this specification, the "front body region" of the diaper 1 means the part which covers the abdomen (body front) of a wearer when the diaper 1 is put on the wearer. The "crotch region" of the diaper 1 means the part which covers the crotch of a wearer when the diaper 1 is put on a wearer. The "back body region" of the diaper 1 means a part covering the wearer's back (back of the body) when the diaper 1 is put on the wearer. In addition, in this specification, "the longitudinal direction" means the direction which connects the front body area of the diaper 1, and the back body area. That is, the longitudinal direction of the diaper 1 coincides with the direction in which the front body region, the crotch region, and the rear body region are connected. In addition, "the width direction" means the direction orthogonal to the longitudinal direction of the diapar 1.

In the present embodiment, as an example of an absorbent article, an underpants-type tubular structure having an opening through which the wearer's abdomen enters and a pair of left and right openings through which the wearer's left and right lower limbs are inserted is exemplified. Disposable diapers, but the "absorbent article" in this specification is not limited to underpants type disposable diapers. In the "absorbent article", for example, it includes a belt that is fixed to the vicinity of one end of a sheet-shaped member that covers the wearer's crotch (pubic area) from the front body area to the rear body area. Absorbent articles of various forms that can wrap around the abdomen and crotch, such as belt-type disposable diapers that are attached to the vicinity of the other end of the member to form a tubular structure.

As shown in Figures 13 to 15, the diaper 1 has a crotch region 1B covering the wearer's crotch (pubic area), a front body region 1F covering the wearer's abdomen, and a back thigh covering the wearer's back in the worn state. body area 1R. The crotch area 1B is located between the front body area 1F and the back body area 1R and is connected with the front body area 1F and the back body area 1R, and the absorbent part main body 15 ( Absorbent body 8).

The diaper 1 in this embodiment is an underpants-type disposable diaper, so by joining the left edge of the front body region 1F and the left edge of the rear body region 1R to each other and connecting the right edge of the front body region 1F It joins with the right side edge of the back body region 1R to form the state shown in FIG. 13 . As shown in FIG. 13 , a trunk opening (waist opening) 2T is formed by the upper edge of the front body region 1F and the upper edge of the rear body region 1R. In addition, in the diaper 1 , a left lower limb opening 2L is formed on the left side of the crotch region 1B that is not joined, and a right lower limb opening 2R is formed on the right side of the crotch region 1B. The left lower limb opening 2L and the right lower limb opening 2R are openings for passing the wearer's legs when the diaper 1 is worn.

If the diaper 1 is worn in such a way that the wearer's left lower limb is inserted into the left lower limb opening 2L, the wearer's right lower limb is inserted into the right lower limb opening 2R, and the wearer's trunk enters (passes) the trunk opening 2T, then The front body region 1F is in contact with the wearer's abdomen, the rear body region 1R is in contact with the wearer's back side, the crotch region 1B is in contact with the wearer's crotch, and the left lower limb opening 2L and the right lower limb The opening 2R is fixed to the wearer's body in a state surrounding the wearer's thigh. By fixing the diaper 1 to the wearer's body in this way, standing and walking in the state where the diaper 1 is worn can be realized.

In the diaper 1, the absorber 8 capable of absorbing and holding liquid is arranged mainly around the crotch region 1B. In addition, in the diaper 1, three-dimensional pleats are respectively provided in the left lower limb opening 2L, the right lower limb opening 2R, and the trunk opening 2T in order to suppress the formation of a gap that becomes a liquid outflow path between the diaper 1 and the wearer's skin. Pleats G1L, three-dimensional pleats G1R, waist pleats G2. The three-dimensional gathers G1L, G1R and the waist gathers G2 are configured to be closely attached to the wearer's skin by the elastic force of the linear rubber, so that the excrement discharged from the wearer can be absorbed in the absorbent without leaking from the diaper 1. The part main body 15 (absorbent body 8).

As shown in FIG. 14 and FIG. 15 , the diaper 1 has cover sheets 4F and 4R and a pad cover sheet 6 that form the outer surface in a state worn by a wearer. The cover sheet 4F is a sheet member mainly forming the outer surface of the front body region 1F of the diaper 1 . In addition, the pad cover sheet 6 is a sheet member mainly used to form the outer surface of the crotch region 1B of the diaper 1 . In addition, the cover sheet 4R is a sheet member mainly used to form the outer surface of the back body region 1R of the diaper 1 .

The cover sheets 4F, 4R and the pad cover sheet 6 are provided for, for example, reinforcement of the outer surface of the diaper 1 and improvement of texture. In addition, the cover sheets 4F, 4R and the pad cover sheet 6 can be formed of, for example, a nonwoven 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), polypropylene (PP), and the like. In addition, a liquid-impermeable sheet may be formed with many fine pores of about 0.1 to several μm so as to exhibit liquid-impermeability and moisture permeability.

Moreover, the diaper 1 has the inner cover sheet 5F laminated|stacked on the skin facing side of the cover sheet 4F, and the inner cover sheet 5R laminated|stacked on the skin facing side of the cover sheet 4R. In this specification, "the skin facing surface" means the surface which opposes the wearer's skin when the wearer wears the diaper 1 . Details will be described later. The inner cover sheet 5F is a sheet member bonded to the cover sheet 4F in a state in which linear rubber as a linear elastic member is sandwiched between layers with the cover sheet 4F. The inner cover sheet 5F is a sheet member having a shape and a size corresponding to the portion of the cover sheet 4F except for a folded portion 4F5 described later and the first waist region RW1 of the outer cover portion 4F10 . In addition, the inner cover sheet 5R is a sheet member bonded to the cover sheet 4R in a state in which linear rubber as a linear elastic member is interposed between layers with the cover sheet 4R. The inner cover sheet 5R is a sheet member having a shape and a size corresponding to a portion of the cover sheet 4R except for a folded portion 4R5 described later and the first waist region RW1 of the outer cover portion 4R10 .

The diaper 1 of this embodiment is equipped with the absorption part main body 15. As shown in FIG. The absorber main body 15 is held in a state of being spanned between the front body region 1F and the rear body region 1R, and is arranged on the crotch of the wearer when the diaper 1 is worn, and absorbs and holds liquid such as urine excreted by the wearer. As shown in FIGS. 14 and 15 , the absorber main body 15 includes the pad sheet 6 , the back sheet 7 , the absorber 8 , the central sheet 9 , and the side sheets 10L, 10R, etc., and is integrally formed of them.

The backsheet 7, the absorber 8, and the center sheet 9 are laminated sequentially on the skin-facing surface of the pad sheet 6. The pad cover sheet 6 is a sheet member having a rectangular plane having a length extending from the wearer's front body through the crotch to the rear body in the length direction, and having a width direction perpendicular to the length direction. Has a predetermined lateral width. In addition, the back sheet 7, the absorber 8, and the central sheet 9 are all sheet members having a rectangular plane similar to the pad sheet 6, and are pressed against the pad sheet 6 in a state where the longitudinal direction coincides with the longitudinal direction of the pad sheet 6. The back sheet 7, the absorber 8, and the center sheet 9 are laminated in this order.

The absorber 8 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 8 is arranged between the liquid-impermeable backsheet 7 and the liquid-permeable center sheet 9 . The absorber 8 may also have short fibers of cellulose-based fibers such as pulp fibers, rayon fibers, or cotton fibers, or synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. The interstices of the obtained short fibers have a structure of granular absorbent resin such as a hydrophilic superabsorbent polymer having a crosslinked structure capable of absorbing and retaining water. Thereby, when the absorber 8 absorbs the liquid excreted from the wearer, it can swell the absorbent resin held in the gaps in the short fibers to hold the liquid in the short fibers. In addition, 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 stacked. In addition, the absorber 8 can take an appropriate shape according to the purpose. Examples of the shape of the absorber 8 include a rectangular shape, an hourglass shape narrowed in the vicinity of the center, and various other shapes.

The center sheet 9 is a sheet member that directly contacts the skin of the crotch of the wearer to allow liquid such as urine to pass through the absorber 8 , and is laminated so as to cover the water-absorbing surface of the absorber 8 . The central sheet 9 in this embodiment is formed of a highly flexible liquid-permeable material. As a liquid-permeable material which forms the center sheet|seat 9, a woven fabric, a nonwoven fabric, a porous film etc. can be illustrated, for example. In addition, the center sheet 9 may have hydrophilicity.

The backsheet 7 is a sheet member for suppressing leakage of the liquid absorbed by the absorber 8 through the center sheet 9 to the outside of the diaper 1 . Thus, the backsheet 7 is formed of a liquid-impermeable material. As a liquid-impermeable material which forms the back sheet 7, the liquid-impermeable film etc. which consist of polyethylene resin can be illustrated. In addition, the back sheet 7 may be formed of a microporous polyethylene film in which many micropores are formed in order to ensure air permeability.

The pad sheet 6 is a member for reinforcing the back sheet 7 and making it feel good on the skin, and is attached to the back sheet 7 . As a material which forms the pad sheet 6, a woven fabric and a nonwoven fabric can be illustrated. In addition, the cover sheet 6 may be nonwoven fabric or wet laid nonwoven fabric made of thermoplastic resin such as polyethylene, polypropylene, polyester, or the like.

The side panels 10L, 10R in the absorber body 15 are elongated belt-shaped members for forming the above-mentioned three-dimensional gathers G1L, G1R. The side panels 10L and 10R are extended along the long sides of the central panel 9 . In addition, linear rubbers 10L1 and 10R1 are adhered to the side sheets 10L and 10R along the longitudinal direction. If 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 rear body region 1R are joined to each other and will form the front body The right edge 4F8 of the cover sheet 4F of the right edge of the region 1F and the right edge 4R8 of the cover sheet 4R of the right edge of the rear body region 1R are joined together to form the diaper 1 shown in FIG. 10L and 10R are stretched in the longitudinal direction by the contraction force of the linear rubbers 10L1 and 10R1, and as a result, stand up from the center sheet 9 along the fold lines 10L2 and 10R2.

Thereby, three-dimensional gathers G1L, G1R which prevent the outflow of liquid from 2L of left lower-limb opening parts, and 2R of right lower-limb opening parts are formed. The method of joining the side edges of the cover sheets 4F, 4R is not particularly limited, but examples thereof include heat sealing, high-frequency sealing, ultrasonic sealing, and the like. Furthermore, the absorber main body 15 extends from the front body region 1F to the rear body region 1R.

Next, the detailed structure of the diaper 1 is demonstrated. As shown in FIG. 15 , the front end side of the cover sheet 4F is folded inward with a fold line 4F6 as a boundary to form a folded portion 4F5 . Hereinafter, the part other than the folded part 4F5 in the cover sheet 4F is called exterior cover part 4F10. The exterior cover part 4F10 of the cover sheet 4F forms the outer surface of the diaper 1 . The folded line 4F6 of the cover sheet 4F forms the trunk opening edge 4F9 of the trunk opening 2T in the assembled state of the diaper 1 .

In the folded portion 4F5 of the cover sheet 4F, the stretched first linear rubber 4F1 is arranged between the layers of the outer cover portion 4F10 . In addition, the front end side of the folded portion 4F5 in the cover sheet 4F sandwiches the inner cover sheet 5F, the pad cover sheet 6, the back sheet 7, and the absorber 8 at one end side in the longitudinal direction with the outer cover portion 4F10. In the state between them, it is bonded in a state of being superimposed on one end of the absorber 8 . In addition, in this specification, it is expressed that the form of overlapping one member and another member is not limited to the form in which the members are in full contact with each other, but includes a form in which a part of one member overlaps the other member as a whole, or Concepts such as the way a component and parts of other components overlap each other.

And, as shown in FIG. 15, between the layers of the outer cover portion 4F10 of the cover sheet 4F and the inner cover sheet 5F, from the side of the fold line 4F6, the second linear rubber 4F2, the third linear rubber 4F3, the fourth linear rubber The shape rubber 4F4 is sequentially arranged in this order, and is bonded in a state of being sandwiched between the outer cover portion 4F10 and the inner cover sheet 5F. As shown in FIG. 15 , a plurality of first linear rubbers 4F1 to fourth linear rubbers 4F4 are arranged in parallel in the cover sheet 4F, and all extend along the width direction (direction around the trunk) of the cover sheet 4F.

On the other hand, also in the cover sheet 4R, the front end side is folded inward with the fold line 4R6 as a boundary to form a folded portion 4R5. Hereinafter, the portion other than the folded portion 4R5 in the cover sheet 4R is referred to as an exterior cover portion 4R10. The exterior cover part 4R10 of the cover sheet 4R forms the outer surface of the diaper 1 . The folded line 4R6 of the cover sheet 4R forms the trunk opening edge 4R9 of the trunk opening 2T in the assembled state of the diaper 1 . In the folded portion 4R5 of the cover sheet 4R, the stretched first linear rubber 4R1 is arranged between the layers of the outer cover portion 4R10. In addition, the front end side of the folded part 4R5 in the cover sheet 4R sandwiches 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 with the outer cover part 4R10. The state between the layers is bonded in a state of overlapping the other end of the absorber 8 .

And, as shown in FIG. 15 , between the layers of the outer cover portion 4R10 of the cover sheet 4R and the inner cover sheet 5R, from the fold line 4R6 side, the second linear rubber 4R2 , the third linear rubber 4R3 , the fourth thread The shape rubber 4R4 is sequentially arranged in this order, and is bonded in a state of being sandwiched between the outer cover portion 4R10 and the inner cover sheet 5R. As shown in FIG. 15 , a plurality of first linear rubbers 4R1 to fourth linear rubbers 4R4 in the cover sheet 4R are arranged in parallel, and all extend along the width direction (direction around the trunk) of the cover sheet 4R.

Hereinafter, in the cover sheets 4F and 4R of the diaper 1, the region where the first linear rubbers 4F1 and 4R1 and the second linear rubbers 4F2 and 4R2 are arranged is referred to as "waist region RW". The waist region RW of the diaper 1 is a region that is located near the trunk opening end edges 4F9 and 4R9 that form the trunk opening 2T and that forms the waist gathers G2. In addition, the region in which the first linear rubbers 4F1 and 4R1 are arranged in the waist region RW is referred to as a "waist first region RW1" (first region), and the region in which the second linear rubbers 4F2 and 4R2 are arranged is called "Waist 2nd area RW2" (2nd area).

Moreover, in the cover sheets 4F and 4R of the diaper 1, the area|region in which the 3rd linear rubber 4F3 and 4R3 and the 4th linear rubber 4F4 and 4R4 are arrange|positioned is called "abdominal area|region RT." The abdomen region RT is a region located below the waist region RW. In the abdominal region RT, the region where the third linear rubbers 4F3 and 4R3 are arranged is referred to as "the first abdominal region RT1", and the region where the fourth linear rubbers 4F4 and 4R4 are arranged is referred to as the "second abdominal region RT2". .

Here, the first linear rubbers 4F1, 4R1 in the waist first region RW1 are coated with an adhesive in a stretched state, for example, during the assembling process of the diaper 1, and then the outer covering parts 4F10, 4R10 and The folded portions 4F5 and 4R5 are sandwiched between and bonded between these layers. Similarly, the second linear rubbers 4F2, 4R2 in the waist second region RW2 and the third linear rubbers 4F3, 4R3 and fourth linear rubbers 4F4, 4R4 in the abdominal region RT are, for example, in the process of assembling the diaper 1. After the adhesive is applied in the stretched state, it is sandwiched between the outer cover parts 4F10 and 4R10 of the cover sheets 4F and 4R and the inner cover sheets 5F and 5R to be bonded between these layers.

Here, if the first linear rubber 4F1 of the waist first region RW1 is sandwiched and bonded between the outer cover portions 4F10, 4R10 of the cover sheets 4F, 4R and the inner cover sheets 5F, 5R in an elongated state, , 4R1 contract, then following it, the parts corresponding to the first waist region RW1 in the outer cover parts 4F10, 4R10 and the folded parts 4F5, 4R5 are flexed continuously in a pleated shape, thereby forming the first waist region RW1 in the The first contraction part S1 contracted in the direction around the trunk.

Also in the waist second region RW2, if the second linear rubber 4F2, 4R2 sandwiched and bonded between the layers of the outer cover parts 4F10, 4R10 and the inner cover sheets 5F, 5R in an extended state shrinks, the following In addition, the parts corresponding to the second waist region RW2 in the outer cover parts 4F10, 4R10 and the inner cover sheets 5F, 5R are continuously bent in a pleated shape, thereby forming a shape that shrinks the second waist region RW2 in the direction around the trunk. The second constricted part S2 (an example of the "trunk opening upper side constricted part" referred to in this application).

In the present embodiment, the waist gathers G2 are mainly formed by the first constricted portion S1 formed in the first waist region RW1 and the second constricted portion S2 formed in the second waist region RW2. The waist gathers G2 improve the fit of the diaper 1 around the wearer's waist by the contraction force of the first linear rubbers 4F1, 4R1 and the second linear rubbers 4F2, 4R2. In the first constricted portion S1 of the waist gather G2, a plurality of first linear rubbers 4F1, 4R1 are arranged in parallel with each other at a constant interval A1. In addition, in the second constricted portion S2 of the waist gather G2, a plurality of second linear rubbers 4F2 and 4R2 are provided parallel to each other at a constant interval A2. In addition, the space|interval of linear rubbers mentioned here means the dimension by which adjacent linear rubbers isolate|separate in the longitudinal direction (direction which connects a front body area and a rear body area) of a diaper.

In addition, in this embodiment, the first linear rubbers 4F1 and 4R1 in the waist first region RW1 and the second linear rubbers 4F2 and 4R2 in the waist second region RW2 extend over the entire width of the cover sheets 4F and 4R. Therefore, after completion of the diaper 1 , the first linear rubbers 4F1 , 4R1 and the second linear rubbers 4F2 , 4R2 form a substantially annular elastic member that goes around along the trunk opening 2T. In other words, after the completion of the diaper 1, the waist gathers G2 (1st contraction part S1, 2nd contraction part S2) are formed over the whole circumference around a trunk direction.

Also in the abdomen first region RT1, if the third linear rubber 4F3 sandwiched and bonded between the layers of the outer cover parts 4F10, 4R10 of the cover sheets 4F, 4R and the inner cover sheets 5F, 5R in an elongated state, , 4R3 contract, then following it, the outer cover parts 4F10, 4R10 of the cover sheets 4F, 4R and the parts corresponding to the first abdominal region RT1 in the inner cover sheets 5F, 5R flex continuously in a pleated shape, thereby forming The third constricted portion S3 of the first abdominal region RT1 shrinks in the direction around the trunk (an example of the “constricted portion at the lower side of the trunk opening” in this application). The third constricted portion S3 is a region that fits around the height of the wearer's waist when the diaper 1 is worn, and is provided in a region that includes a distance of 20 mm to 40 mm from the opening edge of the trunk opening 2T.

In addition, also in the abdomen second region RT2, if the fourth linear shape sandwiched and bonded between the layers of the outer cover parts 4F10, 4R10 of the cover sheets 4F, 4R and the inner cover sheets 5F, 5R is in an extended state. When the rubber 4F4, 4R4 shrinks, the outer cover parts 4F10, 4R10 of the cover sheets 4F, 4R and the parts corresponding to the second abdominal region RT2 of the cover sheets 4F, 4R and the inner cover sheets 5F, 5R are continuously flexed in a pleated shape, thereby A fourth contraction portion S4 is formed that contracts the second abdominal region RT2 in the direction around the trunk. In addition, in the present embodiment, the belly gather G3 is mainly formed by the third constricted portion S3 formed in the first abdomen region RT1 and the fourth constricted portion S4 formed in the second abdomen region RT2. The belly gather G3 improves the fit of the diaper 1 around the wearer's lower abdomen, for example, by the contraction force of the third linear rubbers 4F3, 4R3 and the fourth linear rubbers 4F4, 4R4.

The third linear rubbers 4F3 and 4R3 arranged in the third constricted portion S3 of the belly gather G3 are provided parallel to each other with a constant interval A3 therebetween. In addition, the fourth linear rubbers 4F4 and 4R4 arranged in the fourth constricted portion S4 of the belly gather G3 are also provided parallel to each other with a constant interval A4 therebetween. In addition, in the present embodiment, the distance A3 between the third linear rubbers 4F3 and 4R3 in the third constricted portion S3 of the belly gather G3 is set to be smaller than the distance A3 between the third linear rubbers 4F3 and 4R3 in the second constricted portion S2 of the waist gather G2. The distance A2 between the linear rubbers 4F2 and 4R2 is large, so that when the diaper 1 is worn with the trunk opening 2T widened, the third contraction of the belly gather G3, which is a part of the wearer's waist, is easily contracted. The portion S3 is relatively expanded compared with the second constricted portion S2 of the waist gathers G2.

In addition, in this embodiment, in order to form the first constricted portion S1 to the fourth constricted portion S4, each of the linear rubbers 4F1, 4R1, 4F2, 4R2, 4F3, 4R3, 4F4, 4R4 is placed along the edges of the cover pieces 4F, 4R. It is extended in the width direction (direction around the trunk), but any linear stretchable member is sufficient, and it is not limited to linear rubber, and other materials and forms may be used. In addition, in the present specification, "linear" means a form that is elongated and extends in a specific direction, and is a concept including strip-like and rectangular shapes. In addition, although natural rubber, synthetic rubber, etc. can be illustrated as a material of linear rubber, it is not limited to a specific material.

Next, the ventilation passage forming sheets 11F and 11R of the diaper 1 will be described. As shown in Fig. 14 and Fig. 15, the diaper 1 is provided with folded parts 4F5, 4R5 in the cover sheets 4F, 4R and the longitudinal end regions of the pad cover sheet 6, the center sheet 9, etc. in the absorber body 15. The air passage forming sheets 11F, 11R are disposed on the folded portions 4F5, 4R5. The air passage forming sheets 11F and 11R form the skin contact surfaces of the waist gather G2 and the belly gather G3 of the diaper 1 . The "skin contact surface" means the surface which directly contacts the wearer's skin when the diaper 1 is worn, that is, the innermost surface of the diaper 1 .

FIG. 16 : is a figure explaining the installation form of air passage forming sheet|seat 11F, 11R of the diaper 1 which concerns on embodiment. (A) of FIG. 16 is a figure which shows the state which looked at the 1st contraction part S1 of the waist gather G2 from the internal space side of the diaper 1. As shown in FIG. Moreover, (B) of FIG. 16 is a figure which schematically shows the internal structure in the 1st contraction part S1 of the waist gathers G2 at the time of seeing from the side of the diaper 1. As shown in FIG. In addition, (C) of FIG. 16 is a figure which looked at the state of the 1st contraction part S1 of the waist gather G2 from the upper direction of the diaper 1 (namely, the A direction of (B) viewing direction). (A) and (C) of FIG. 16 have shown the state before the 1st contraction part S1 in the waist gather G2 contracted for convenience. In addition, (D) of FIG. 16 is a figure which shows the state which looked at the 1st contraction part S1 of the waist gather G2 after contraction from above.

The air passage forming sheets 11F, 11R are disposed at least at the positions corresponding to the first constricted portion S1, the second constricted portion S2, and the third constricted portion S3, and are joined to the gasket sheet 6 via the joint portion denoted by reference sign S. The end regions in the longitudinal direction and the folded parts 4F5, 4R5, etc. FIG. 17 is a diagram showing the location of the joining portion S where the air passage forming sheets 11F and 11R are joined. In this embodiment, the joint portion is formed by joining the folded portions 4F5, 4R5 of the cover sheets 4F, 4R formed of thermoplastic resin and the air passage forming sheets 11F, 11R of the backing sheet 6 by ultrasonic welding. S. As shown in Fig. 16(A) and Fig. 17, a plurality of joints are intermittently arranged from the trunk opening edge 4F9, 4R9 of the cover pieces 4F, 4R along the longitudinal direction perpendicular to the direction around the trunk (width direction). The portion S forms a linear joint portion SL extending in the longitudinal direction of the diaper 1 . In other words, one linear junction SL is formed as an aggregate of a plurality of junctions S arranged intermittently along the longitudinal direction of the diaper 1 . Here, disposing "intermittently" means discontinuously or intermittently disposing.

As shown in FIG. 16(A) , a plurality of linear joints SL are intermittently arranged in the first constricted portion S1 of the waist gathers G2 along the torso-circling direction (width direction) of the cover sheets 4F, 4R. In the example shown in FIG. 16(A), each linear junction part SL is mutually provided in parallel, and the space|interval of linear junction part SL is set so that the magnitude|size may alternate. That is, the linear joints SL are intermittently arranged in such a manner that the double wires formed by one set of the linear joints SL are arranged side by side at equal intervals in the direction around the trunk (width direction). In addition, in FIG. 15(A), the range where the linear junction part SL extends in the longitudinal direction of the diaper 1 is shown by hatching. As shown in the drawing, the linear joint SL extends across the first waist region RW1 forming the first constricted portion S1 and the second waist region RW2 forming the second constricted portion S2.

Ultrasonic bonding of the air passage forming panels 11F and 11R in the first constricted portion S1 and the second constricted portion S2 of the waist gather G2 and the third constricted portion S3 of the belly gather G3 to the first linear rubber of the waist gather G2 4F1, 4R1 and the second linear rubbers 4F2, 4R2, and the third linear rubbers 4F3, 4R3 and fourth linear rubbers 4F4, 4R4 of the belly gather G3 are performed in a stretched state. And, after the joining of the air passage forming sheets 11F and 11R in the first constricted portion S1 and the second constricted portion S2 of the waist gather G2 and the third constricted portion S3 of the belly gather G3 is completed, they are sandwiched and fixed to the sheet. The stretched states of the first linear rubbers 4F1, 4R1, second linear rubbers 4F2, 4R2, third linear rubbers 4F3, 4R3, and fourth linear rubbers 4F4, 4R4 between the layers are released. As a result, the waist gathers G2 and the belly gathers G3 shrink, and the distance between the linear junctions SL in the air passage forming sheets 11F, 11R narrows. Thereby, the non-joint region 110 located between the linear joint parts SL among the air passage forming sheets 11F and 11R is deformed into a wave shape by bending.

As a result, the non-joint regions 110 located between the linear joint parts SL are separated, thereby forming non-joint joints between the folded parts 4F5 and 4R5 and the air passage forming sheets 11F and 11R as shown in (D) of FIG. 16 . The first air passage 111 surrounded by the joint area 110 . In addition, the second air passage 112 is formed on the skin contact surface 11 a side of the air passage forming sheets 11F, 11R. In FIG. 16(D) , the two-dot chain line indicated by the code|symbol SS shows the skin surface which abuts on the air passage forming sheets 11F and 11R when the wearer wears the diaper 1 as a phantom line. The second air passage 112 is formed as a gap formed between the skin contact surfaces 11a of the air passage forming sheets 11F, 11R and the wearer's skin when the wearer wears the diaper 1 . Moisture in the internal space of the diaper 1 can pass through the first air passage 111 and the second air passage 111 formed in the first constricted portion S1 and the second constricted portion S2 of the waist gather G2 and the third constricted portion S3 of the belly gather G3. Road 112 and discharged to the outside. The first ventilation passage 111 is a ventilation passage through which moisture permeated through the ventilation passage forming sheets 11F and 11R from the internal space of the diaper 1 passes. On the other hand, the second ventilation passage 112 is a ventilation passage directly connecting the internal space of the diaper 1 with the external space, and can discharge moisture in the diaper 1 more smoothly.

As shown in (D) of FIG. 16 , relatively large first gathers 41 and relatively small second gathers 42 forming the first constricted portion S1 are alternately formed after the waist gathers G2 and belly gathers G3 are shrunk. In addition, relatively large first pleats 113 and relatively small second pleats 114 are alternately formed in the air-flow passage forming sheets 11F, 11R that are deformed into waves by bending. This is because the intervals between the linear joints SL are set so as to be alternately large and small. That is, the large first pleats 41 and 113 are formed by a set of linear joints SL with a wide interval, and the small second pleats 42 and 114 are formed by a set of linear joints SL with a narrow interval.

Here, the first pleats 113 of the air passage forming sheets 11F, 11R bent and deformed into waves function to secure the large first air passage 111 in cooperation with the first pleats 41 forming the first constricted portion S1 . On the other hand, the second pleats 114 of the air passage forming sheets 11F, 11R cooperate with the second pleats 42 forming the first constricted portion S1 to form the first air passage 111 and are adjacent to each other in the direction around the trunk (width direction). The first pleats 113 are properly separated from each other to ensure the air-permeable cross-section of the second air-permeable passage 112 to function. In this embodiment, the groove structure formed by the air passage forming sheets 11F, 11R deformed into waves following the contraction of the waist gather G2 and the belly gather G3 is provided on the first constricted portion S1 and the waist gather G2. The second constricted part S2 and the skin-contacting surface side of the third constricted part S3 of the belly gather G3 can effectively discharge moisture in the diaper 1 to the outside through the first air passage 111 and the second air passage 112 . In addition, in this embodiment, since the linear junction part SL is formed as the aggregate of the several junction part S arrange|positioned intermittently along the longitudinal direction of the diaper 1, the gap between junction|joint part S and adjacent The first air passages 111 communicate with each other. Therefore, it is possible to improve the air permeability between the adjacent first ventilation passages 111 , and it is difficult for the wearer to feel a local hot flush.

Furthermore, the air passage forming sheets 11F, 11R in this embodiment are provided with many fine air holes 11F1, 11R1 for air ventilation. Here, the air hole means an opening that communicates the space on one side of the sheet with the space on the other side, and its shape is not particularly limited. Therefore, as the air holes 11F1 and 11R1 , for example, openings having a shape such as a circle, an ellipse, or a polygon (triangular, square, or the like) can be applied. The formation of the air holes 11F1, 11R1 to the air passage forming sheets 11F, 11R does not mean that the air passage forming sheets 11F, 11R are not air-permeable materials, and the air passage forming sheets 11F, 11R may be air-permeable. The material may also be a material that does not have air permeability. The air passage forming sheets 11F and 11R are preferably made of an air-permeable and liquid-permeable material, but may also be made of an air-impermeable material, for example. The size and number of air holes 11F1 and 11R1 are not particularly limited, but for example, about 5 to 200 holes are preferably formed with an opening area of 0.5 to 10 mm ² .

Furthermore, the inventors of the present invention conducted earnest research and found that the distance A3 between the third linear rubbers 4F3 and 4R3 forming the third constricted portion S3 is greater than that of the second linear rubber 4F2 forming the second constricted portion S2. , 4R2, the distance A2 between each other is large, so that the third constricted part S3 is guided to the wearer's lumbar bone in such a way that the diaper 1 becomes an appropriate wearing state, and the third constricted part S3 that expands and contracts in accordance with the wearer's movement Exhaustion of moisture from the inside of the diaper 1 is promoted by the pump effect due to the expansion and contraction deformation of the first ventilation passage 111 and the second ventilation passage 112 . In particular, it has been found that by setting the gap A3 to 6.5 mm to 12 mm, the air passage forming sheets 11F, 11R are formed by the third gap compared with the case where the gap A3 is set to be narrower than it. The degree of restraint by the linear rubbers 4F3 and 4R3 decreases, and the decrease in the degree of restraint increases the size of the first air passage 111 and the second air passage 112 to increase the pumping effect in the third constricted portion S3.

Fig. 18 is a graph showing the magnitude of contraction force in each contraction portion. The hollow arrows shown in Fig. 18 indicate the magnitude of contraction force. In the diaper 1 of the present embodiment, the distance A3 between the third linear rubbers 4F3 and 4R3 forming the third constricted portion S3 is larger than the distance A2 between the second linear rubbers 4F2 and 4R2 forming the second constricted portion S2. Therefore, in the diaper 1 of this embodiment, as shown in FIG. 18, the contraction force of the 3rd constriction part S3 is weaker than the contraction force of the 1st constriction part S1 and the 2nd constriction part S2. And, the 3rd constriction part S3 is designed to abut against the waist bone of the wearer in the state where the diaper 1 is worn in an appropriate position. In addition, as shown in FIG. The part with the largest width. In addition, the third constriction part S3 is provided in the range including the trunk opening so as to correspond to the distance between the first joint and the second joint of the index finger of an ordinary adult to the fingertip, that is, within the range of 20 mm or more and 40 mm or less. The distance between the edge of the opening of the portion 2T is within a range of not less than 20 mm and not more than 40 mm. Therefore, in the diaper 1 of this embodiment in which the contraction force of the third constriction part S3 is weaker than the contraction force of the first constriction part S1 and the second constriction part S2, the trunk opening 2T is opened by the hand when the wearer puts it on. , the 3rd constricted part S3 expands the most, so it becomes the following state: the second joint of the index finger of the person carrying out the wearing operation is hung near the opening edge of the trunk opening 2T, the 1st constricted part S1 and the 2nd constricted part S2 is located between the first joint and the second joint of the index finger, and the tip of the index finger is hooked on the third constricted part S3 which is easier to expand than the first constricted part S1 and the second constricted part S2. Furthermore, it is worn so that the lumbar bone with the largest width among the wearer's waist is naturally accommodated in the most extended third constricted portion S3. As a result, the third constricted portion S3 is designed so that the diaper 1 that is in contact with the wearer's waist can be worn on the wearer at an appropriate position.

Fig. 19 is a diagram illustrating gathers formed in the second constricted portion S2 of the waist gather G2 and the third constricted portion S3 of the belly gather G3. Among the pleats formed between the linear rubbers, the closer the distance to the linear rubbers, the higher the degree of restraint by the linear rubbers. As a result, the first pleats 113 and the second pleats 114 of the air passage forming sheets 11F, 11R formed between the third linear rubbers 4F3, 4R3 are not formed at the interval ratio between the third linear rubbers 4F3, 4R3. The first pleats 113 and the second pleats 114 of the air passage forming sheets 11F, 11R are constrained between the second linear rubbers 4F2 , 4R2 arranged at the narrower interval A2 than the interval A3 . Accordingly, the gathers formed in the third constricted portion S3 of the belly gather G3 are larger than the gathers formed in the second constricted portion S2 of the waist gather G2. Therefore, according to the diaper 1 of this embodiment, the size of the first air passage 111 and the second air passage 112 formed by the first pleats 113 and the second pleats 114 are larger in the portion of the belly gather G3 than in other parts. Furthermore, since the belly gather G3 is a portion that expands and contracts with the movement of the wearer, the first air passage 111 and the second air passage 112 formed in the portion of the belly gather G3 expand and contract in conjunction with the movement of the wearer. The pump functions to discharge the moisture inside the diaper 1 more smoothly. In addition, the lumbar part of the wearer is the part with the largest lateral width among the wearer's waist, and it is also a part where the surrounding objects of the wearer are likely to contact and exert external pressure. Therefore, in the belly gather G3 corresponding to the lumbar part, , the pump effect due to the expansion and contraction of the first air passage 111 and the second air passage 112 by external pressure can also be expected. Thereby, the internal space of the diaper 1 can be made into a more comfortable environment.

In addition, according to the diaper 1 of this embodiment, since the gathers formed in the part of the belly gather G3 are larger than the gathers formed in the second constricted part S2 of the waist gather G2, the gathers in the part of the belly gather G3 are larger than those in the other parts. The pleats are conspicuous, and the wearer can naturally recognize that the belly gathers G3 are brought into contact with the waistbone, which has the largest lateral width among the wearer's waists. In addition, since the gathers formed in the belly gather G3 are larger than the gathers formed in the second constricted portion S2 of the waist gather G2, the belly gather G3 is easily expanded when the trunk opening 2T is expanded. Therefore, when the diaper 1 is worn, the diaper 1 is easily and naturally aligned so that the portion of the belly gather G3 which is relatively easy to expand comes into contact with the waist bone.

The diaper 1 of the above-mentioned embodiment may be deformed as follows, for example. Fig. 20 is a diagram schematically showing a state in which a diaper 1 according to a modified example is unfolded. In this modified example, the distance A1 between the first linear rubbers 4F1 and 4R1 in the first constricted portion S1 is set to be larger than the distance A2 between the second linear rubbers 4F2 and 4R2 in the second constricted portion S2. Accordingly, the first constricted portion S1 assumes a moisture discharge function of discharging moisture in the internal space of the diaper 1 to the outside, and a function of easily expanding the trunk opening 2T. On the other hand, the second constricted portion S2 of the waist gather G2 assumes a position holding function (slip suppression function) for suppressing slipping when the diaper 1 is worn by increasing the contracting force in the direction around the trunk compared with the first constricted portion S1. .

Fig. 21 is a diagram illustrating the gathers formed in the first and second constricted parts S1 and S2 of the waist gather G2 and the third constricted part S3 of the belly gather G3. As described above, among the pleats formed between the linear rubbers, the closer the distance to the linear rubbers, the higher the degree of restraint by the linear rubbers. As a result, the first pleats 113 and the second pleats 114 of the air passage forming sheets 11F, 11R formed between the first linear rubbers 4F1, 4R1 are not formed at a pitch ratio between the first linear rubbers 4F1, 4R1. The first pleats 113 and the second pleats 114 of the air passage forming sheets 11F, 11R are constrained between the second linear rubbers 4F2 , 4R2 juxtaposed between the space A1 narrower than the space A2 . Thereby, the gathers formed in the 1st constriction part S1 of the waist gather G2 are larger than the gathers formed in the 2nd constriction part S2 of the waist gather G2. Therefore, according to the diaper 1 of this modified example, the size ratio of the first air passage 111 and the second air passage 112 formed by the first pleats 113 and the second pleats 114 in the portion of the first constricted portion S1 of the waist gather G2 is The portion of the second constriction S2 is large. In addition, since the waist gather G2 is a part that expands and contracts according to the movement of the wearer, in the first air passage 111 and the second air passage 112, the part of the first constricted part S1 of the waist gather G2 and the abdomen gather The two parts of the G3 part function as pumps to discharge the moisture in the diaper 1 more smoothly (dual pump function). Thereby, the internal space of the diaper 1 can be made into a more comfortable environment.

In the above-mentioned diaper 1 , the ventilation holes formed by linearly cut thin slits may be arranged along the fold lines 4F6 , 4R6 of the cover sheets 4F , 4R in a dotted line. In this case, the dotted-line air holes formed in the fold lines 4F6 and 4R6 are preferably of such a size that the wearer's fingers do not enter. For example, if the ventilation holes are formed by slits with a length of 5 mm or less, the fingers of ordinary infants will not enter. In addition, the intervals between the slits of the dotted air holes formed by the folded lines 4F6 and 4R6 preferably have a predetermined length so as to prevent the cover sheets 4F and 4R from being bounded by the folded lines 4F6 and 4R6 in the normal use state of the diaper 1. And split. Although it also depends on the strength of the material constituting the cover sheets 4F and 4R, if the square meter weight (Japanese: 页量) is about 8 to 50 g/m ² without impairing the elasticity and wearability required for the waist, then The distance between the slits is preferably 2 mm or more.

FIG. 22 is a diagram showing air holes formed at the opening edge of the trunk opening 2T when the waist gathers G2 are contracted. In FIG. 22 , a portion of the cover sheet 4F is shown, but the same applies to the cover sheet 4R. In the diaper 1 of this modified example, the fold lines 4F6, 4R6 of the cover sheets 4F, 4R are dotted air holes formed by thin slits cut in a straight line. Therefore, if the waist gathers G2 pass through the linear When the rubbers 4F1, 4F2 shrink due to the contraction force, the thin slits forming the fold lines 4F6, 4R6 expand, and the air holes 4F6K in the parts other than the seam 4F6T between the slits expand. Therefore, in the diaper 1 of this modified example, not only the air passages formed between the air passage forming sheets 11F, 11R and the cover sheets 4F, 4R (the spaces shown in halftone in FIG. 22 ), but also Air passages (spaces indicated by hatching in FIG. 22 ) formed in the cover sheets 4F, 4R are formed by folding the cover sheets 4F, 4R along the fold lines 4F6, 4R6. Therefore, the diaper 1 of this modified example has higher air permeability in the waist gathers G2 than the diaper in which the air hole 4F6K is not formed in the portion of the fold line 4F6, 4R6. In particular, if it is compared with the embodiment having a double pump function (i.e., the embodiment in which the pump function is performed at two places, namely, the portion of the first contraction portion S1 of the waist gather G2 and the portion of the abdominal gather G3) Combining, the ventilation through the ventilation holes 4F6K is also added, and the moisture in the diaper 1 can be discharged more smoothly. Thereby, the internal space of the diaper 1 can be made into a more comfortable environment.

In addition, although the air passage forming sheets 11F and 11R are provided in the diaper 1 of the above-mentioned embodiment, the air passage forming sheets 11F and 11R may be omitted. If the air passage forming sheets 11F and 11R are omitted, the first air passage 111 and the second air passage 112 disappear, but the degree of restraint by the third linear rubbers 4F3 and 4R3 is maintained, so it is formed in the third constricted portion. The state in which the size of the pleats of S3 is larger than that of the periphery is maintained, and the pumping effect of the third constricted portion S3 can be maintained as in the above-mentioned embodiment.

Explanation of reference signs

1··diapers

1B··Inseam area

1F··Front body area

1R··Rear body area

2T・・Torso opening

G2··waist pleats

4F, 4R cover sheet

4F1, 4R1...1st linear rubber

4F2, 4R2··Second linear rubber

4F3, 4R3...3rd linear rubber

4F4, 4R4··4th linear rubber

11F, 11R··Air passage forming sheet

S··Joint

S1··1st contraction part

S2··The second contraction part

S3··3rd constriction part

S4··4th contraction part

Claims (12)

1. An absorbent article comprising a front body region (1F) covering the wearer's abdomen, a rear body region (1R) covering the wearer's back, and The absorbent article in which the crotch region where the absorber is placed between the rear body regions (1R) is arranged in a row, is characterized in that it comprises: The first constriction part (S1), the first constriction part (S1) includes the torso part which is arranged in the front body area (1F) and the rear body area (1R) and can be inserted by the wearer. The first region where the end edge of the trunk opening of the open trunk opening (2T) is close to and extends along the first telescopic member annularly extending in the direction around the trunk, and shrinks the first region in the direction around the trunk, and The second constriction part (S2), the second constriction part (S2) includes the front body region (1F) and the rear body region (1R) in the The second area adjacent to the crotch area side is extended along the second elastic member in the direction around the torso, and the second area is contracted in the direction around the torso, A plurality of the first telescopic members are arranged at constant intervals in the first constricted portion (S1), and the distance between the first telescopic members is not less than 6.5 mm and not more than 20 mm, A plurality of the second telescopic members are arranged in the second constricted portion (S2), and the distance between the second telescopic members is set to be smaller than the distance between the first telescopic members, The absorbent article further includes an air passage forming sheet that is laminated to form the first constricted part (S1) so as to cover at least a part of the skin-facing surface of the first constricted part (S1). the sheet component; the first telescopic member is bonded to the sheet member, The skin-facing surface of the air passage forming sheet with respect to the first constricted part (S1) is joined by a plurality of joint parts intermittently provided along the direction around the torso, and the first constricted part (S1) contraction, the non-joint areas located between the joint parts are deflected and deformed into waves, so as to form air-permeable passages, and the intervals between the joint parts alternate in size. 2. The absorbent article according to claim 1, wherein: The distance between the first telescopic members is not less than 6.5 mm and not more than 13 mm. 3. The absorbent article according to claim 1, wherein: The first constricted portion (S1) extending in the longitudinal direction connecting the front body region (1F) and the rear body region (1R) extends from the edge of the trunk opening to 26mm to 31mm the following. 4. The absorbent article according to claim 1, wherein: The first constricted part (S1) has a laminated structure in which sheet members are laminated in at least three layers. 5. The absorbent article according to any one of claims 1 to 4, wherein: The first telescopic member is bonded to the sheet member forming the first constricted portion (S1), A longitudinal end portion of the absorber is in contact with the first constricted portion (S1). 6. The absorbent article according to any one of claims 1 to 4, wherein: The stiffness of the second constricted portion (S2) is greater than that of the first constricted portion (S1). 7. The absorbent article according to any one of claims 1 to 4, wherein: It includes: a skin side sheet member laminated on the absorber to form a skin-facing surface; The first telescopic member is bonded to the sheet member forming the first constricted portion (S1), When worn, a space is formed between the skin side sheet member and the wearer's skin in a region overlapping with the vicinity of the end portion in the longitudinal direction of the absorber. 8. The absorbent article according to claim 7, wherein: A fold line that is convex toward the longitudinal end in a region overlapping with the vicinity of the longitudinal end of the absorber in a plan view is formed in the absorber. 9. The absorbent article according to claim 7, wherein: A folding line that is convex toward the longitudinal end in the vicinity of the longitudinal end of the absorber in plan view is formed on the skin side sheet member. 10. The absorbent article according to any one of claims 1 to 4, wherein: The range of the second constricted part (S2) extending in the longitudinal direction from the edge of the opening of the trunk is not less than 31 mm and not more than 71 mm, The expansion strength of the first constricted part (S1) is smaller than that of the second constricted part (S2). 11. The absorbent article according to claim 10, wherein: The second constricted portion (S2) corresponds to a pelvic abutment position abutting on the wearer's pelvis. 12. The absorbent article according to claim 1, wherein: The first telescopic member is bonded to the sheet member forming the first constricted portion (S1), The distance between the first telescopic members is not less than 6.5 mm and not more than 13 mm, The first constricted portion (S1) extending in the longitudinal direction connecting the front body region (1F) and the rear body region (1R) extends from the edge of the trunk opening to 26mm to 31mm the following, A longitudinal end portion of the absorber is in contact with the first constricted portion (S1).

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