JP6662410B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

  BACKGROUND ART Absorbent articles such as disposable diapers, urine pads, and sanitary articles are provided with an absorber for absorbing excreted liquid such as urine and body fluid. As this type of absorber, for example, pulp, superabsorbent polymer (SAP), or the like is used.

  When the absorbent article is worn, moisture generated from urine, body fluids, and the like absorbed by the absorber absorbs the internal space of the absorbent article (between the wearer's skin and the skin contact surface of the absorbent article). (A space formed), and this moisture is not preferred because it causes skin troubles such as skin rash and also causes discomfort such as stuffiness and stickiness.

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

Japanese Patent No. 5761179

  As described above, various proposals have been made to improve the air permeability of the absorbent article, but in reality, it is desired to provide an absorbent article having a higher air permeability. Therefore, an object of the present invention is to provide an absorbent article having better air permeability than conventional ones.

  In order to solve the above problems, the absorbent article according to the present invention has a front body region covering the abdomen of the wearer, a back body region covering the back of the wearer, and the front body region and the back body region. An absorbent article in which a crotch region in which an absorber is located is located and is continuously provided, and among the front body region and the back body region, a torso opening through which a torso of a wearer can be inserted is formed. A first contraction portion that is provided in a first region adjacent to the trunk opening edge and extends along the trunk direction, and that contracts the trunk opening in the trunk direction; A ventilation path forming sheet that is stacked and disposed so as to cover at least a part of the skin-facing surface in the contracted portion, wherein the ventilation path-forming sheet extends in a waist direction with respect to the skin-facing surface in the first contracted portion. Along the joints provided intermittently along The non-joining region located between the joining portions is bent by the contraction of the first contracting portion, and is deformed into a corrugated shape to form a ventilation path. A plurality of the first elastic members are arranged at regular intervals, and an interval between the first elastic members is 6.5 mm or more and 20 mm or less.

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

Further, a range from the trunk opening edge in which the first contraction portion extends in a longitudinal direction connecting the front body portion and the rear body portion may be 26 mm or more and 31 mm or less.

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

  In addition, a second elastic member that is provided in a second region adjacent to the first crotch region with respect to the first region and extends along a waist direction of the front body region and the back body region, A second contraction portion for contracting the trunk opening in the waist direction, wherein the second contraction portion is provided with a plurality of the second telescopic members, and the second telescopic members are connected to each other. May be set to a dimension smaller than the interval between the first elastic members.

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

FIG. 1 is a perspective view of a pants-type disposable diaper according to the embodiment. FIG. 2 is an exploded perspective view of the diaper according to the embodiment. FIG. 3 is a diagram schematically illustrating a state in which the diaper according to the embodiment is developed. FIG. 4 is a diagram illustrating an installation mode of the diaper ventilation path forming sheet according to the embodiment. FIG. 5 is a diagram schematically illustrating a state in which the diaper according to the comparative example is developed. FIG. 6 is a diagram illustrating the interval between the first thread rubbers of the diaper and the folds formed in the first contraction portion according to the comparative example. FIG. 7A is a diagram illustrating a fold in a first contraction portion of the waist gather according to the embodiment. FIG. 7B is a diagram illustrating folds in a first contraction portion of a waist gather according to a comparative example. FIG. 8 is a diagram illustrating the wind speed measurement position in the air permeability quantitative test. FIG. 9 is a diagram showing a mist ventilation test machine used for a mist ventilation test. FIG. 10A is an enlarged photograph of a fold forming a waist gather according to the example. FIG. 10B is an enlarged photograph of a fold forming waist gathers according to a comparative example.

  Hereinafter, embodiments of the present invention will be described. The embodiment shown below is an example of the embodiment of the present invention, and does not limit the technical scope of the present invention to the following aspects.

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

  The term regarding the direction used in the present specification means a direction that coincides with the front, rear, left, and right of the wearer when the diaper 1 is worn by the wearer. For example, in the present specification, the term “left-right direction” means a direction that coincides with the left and right sides of the diaper 1 in a state where the diaper 1 is worn by the wearer.

  Further, in the present specification, the “front body region” of the diaper 1 means a portion that covers the abdomen (front of the body) of the wearer when the diaper 1 is worn on the wearer. The “inseam region” of the diaper 1 means a portion covering the inseam of the wearer when the diaper 1 is worn on the wearer. The “back body region” of the diaper 1 means a portion that covers the wearer's back (back of the body) when the diaper 1 is worn on the wearer. In this specification, the “longitudinal direction” means a direction connecting the front body region and the back body region of the diaper 1. That is, the longitudinal direction of the diaper 1 matches the continuous direction in which the front body region, the crotch region, and the back body region are continuously provided. The “width direction” means a direction orthogonal to the longitudinal direction of the diaper 1.

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

  As shown in FIGS. 1 to 3, the diaper 1 includes a crotch region 1 </ b> B covering a crotch (pubic region) of a wearer, a front body region 1 </ b> F covering an abdomen of the wearer, and a back body covering a back of the wearer. Region 1R. The inseam region 1B is located between the front body region 1F and the back body region 1R and is connected to the front body region 1F and the back body region 1R. The crotch region 1B absorbs and retains a liquid. A main body 15 (absorber 8) is provided.

  Since the diaper 1 in the present embodiment is a pants-type disposable diaper, the left edge of the front body region 1F and the left edge of the rear body region 1R are joined to each other, and the right edge of the front body region 1F and the rear body region 1R are joined together. The right edges are joined together to assemble into the state shown in FIG. As shown in FIG. 1, a torso 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 the diaper 1, a left lower limb opening 2L is formed on the left side of the crotch region 1B where the above-described bonding is not performed, 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 through which a wearer's legs are inserted when the diaper 1 is worn.

  The diaper 1 is inserted such that the left lower limb of the wearer is inserted through the left lower limb opening 2L, the right lower limb of the wearer is inserted through the right lower limb opening 2R, and the torso of the wearer enters (passes) the torso opening 2T. When worn, the front body region 1F contacts the abdomen of the wearer, the back body region 1R contacts the back of the wearer, the crotch region 1B is applied to the wearer's crotch, and the left lower leg opening The 2L and the right lower limb opening 2R are fixed to the wearer's body while surrounding the thigh of the wearer. Since the diaper 1 is fixed to the wearer's body in this way, it is possible to stand and walk while wearing the diaper 1.

  In the diaper 1, an absorber 8 that can absorb and hold a liquid is disposed mainly around the crotch region 1B. The diaper 1 further includes a left lower limb opening 2L, a right lower limb opening 2R, and a torso opening in order to suppress formation of a gap serving as a liquid outflow path between the diaper 1 and the wearer's skin. The portion 2T is provided with a three-dimensional gather G1L, a three-dimensional gather G1R, and a waist gather G2, respectively. The three-dimensional gathers G1L and G1R and the waist gather G2 are configured to be in close contact with the wearer's skin by the elastic force of the thread rubber, so that the excreted liquid discharged from the wearer does not leak from the diaper 1. It can be absorbed by the absorbing portion main body 15 (absorbing body 8).

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

  The cover sheets 4F, 4R and the pad cover sheet 6 are provided, for example, to reinforce the outer surface of the diaper 1 and improve the feel. Further, 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) and polypropylene (PP). In addition, the liquid-impermeable sheet may have a large number of fine pores of about 0.1 to several μm so that the liquid-impermeable and moisture-permeable properties are exhibited.

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

  The diaper 1 according to the present embodiment includes an absorber main body 15. The absorbent main body 15 is held in a state of being bridged between the front body region 1F and the back body region 1R, and is disposed under the wearer's crotch when the diaper 1 is worn, and removes liquid such as urine excreted by the wearer. Absorb and retain. As shown in FIGS. 2 and 3, the absorber main body 15 includes a pad cover sheet 6, a back sheet 7, an absorber 8, a center sheet 9, side sheets 10 </ b> L, 10 </ b> R, and the like, and is formed integrally therewith. .

  The back sheet 7, the absorber 8, and the center sheet 9 are sequentially laminated on the skin facing surface of the pad cover sheet 6. The pad cover sheet 6 has a length in the longitudinal direction that reaches the rear body from the front body of the wearer via the inseam, and has a rectangular plane having a predetermined width in a width direction orthogonal to the longitudinal direction. It is a sheet member having. The back sheet 7, the absorber 8, and the center sheet 9 are all sheet members having a rectangular flat surface like the pad cover sheet 6, and the pad cover is arranged such that its longitudinal direction matches the longitudinal direction of the pad cover sheet 6. The sheets 6 are stacked in this order.

The absorber 8 is a member for absorbing liquid such as urine and retaining the absorbed liquid. The absorber 8 is disposed between the liquid-impermeable back sheet 7 and the liquid-permeable center sheet 9. Absorber 8 is provided with water in gaps between short fibers of cellulosic fibers such as pulp fiber, rayon fiber or cotton fiber, and short fibers obtained by subjecting synthetic fibers such as polyethylene, polypropylene or polyethylene terephthalate to hydrophilic treatment. May have a structure in which a particulate absorbent resin such as a hydrophilic high-absorbent polymer having a crosslinked structure capable of absorbing and retaining the particles is retained. Accordingly, when the absorbent 8 absorbs the liquid excreted from the wearer, the absorbent 8 can swell the absorbent resin held in the gaps in the short fibers and hold the liquid in the short fibers. In addition, the absorber 8 may have a single-layer structure composed of one mat or a laminated structure in which a plurality of mats are overlapped. In addition, the absorber 8 can adopt an appropriate shape according to the purpose. Examples of the shape of the absorber 8 include a rectangular shape, an hourglass shape in which the vicinity of the center is constricted, and various other shapes.

  The center sheet 9 is a sheet member for directly hitting the skin of the wearer's crotch and allowing liquid such as urine to pass through the absorber 8, and is arranged so as to cover the water absorbing surface of the absorber 8. The center sheet 9 in the present embodiment is formed of a liquid-permeable material having high flexibility. Examples of the liquid permeable material forming the center sheet 9 include a woven fabric, a nonwoven fabric, and a porous film. Further, the center sheet 9 may have hydrophilicity.

  The back sheet 7 is a sheet member for suppressing the liquid permeating the center sheet 9 and being absorbed by the absorber 8 from leaking outside the diaper 1. For this reason, the back sheet 7 is formed of a liquid impermeable material. Examples of the liquid impermeable material forming the back sheet 7 include a liquid impermeable film made of a polyethylene resin. Further, the back sheet 7 may be formed of a microporous polyethylene film in which a large number of fine holes are formed in order to secure air permeability.

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

  The side sheets 10L and 10R in the absorber main body 15 are elongated band-shaped members for forming the above-mentioned three-dimensional gathers G1L and G1R. The side seats 10L and 10R extend along the long sides of the center sheet 9. Further, thread rubbers 10L1 and 10R1 are adhered to the side sheets 10L and 10R along the longitudinal direction. The left edge 4F7 of the cover sheet 4F forming the left edge of the front body region 1F and the left edge 4R7 of the cover sheet 4R forming the left edge of the rear body region 1R are joined to each other, and the right edge of the front body region 1F is When the diaper 1 shown in FIG. 1 is assembled by joining the right edge 4F8 of the cover sheet 4F to be formed and the right edge 4R8 of the cover sheet 4R that forms the right edge of the back body region 1R to each other, the side sheets 10L and 10R are assembled. Is drawn in the longitudinal direction by the contraction force of the thread rubbers 10L1 and 10R1, and rises from the center sheet 9 along the folding lines 10L2 and 10R2.

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

  Next, the detailed structure of the diaper 1 will be described. As shown in FIG. 3, the cover sheet 4F has a folded portion 4F5 formed by folding the front end side inward at the folded line 4F6. Hereinafter, the portion of the cover sheet 4F other than the folded portion 4F5 is referred to as an exterior cover portion 4F10. The outer cover portion 4F10 of the cover sheet 4F forms the outer surface of the diaper 1. The return line 4F6 of the cover sheet 4F forms a trunk opening edge 4F9 of the trunk opening 2T in a state where the diaper 1 is assembled.

The folded portion 4F5 of the cover sheet 4F has the first thread rubber 4F1 in an extended state disposed between the outer cover portion 4F10 and the interlayer. In addition, the front end side of the folded portion 4F5 in the cover sheet 4F sandwiches one end side in the longitudinal direction of the inner cover sheet 5F, the pad cover sheet 6, the back sheet 7, and the absorber 8 between the layers with the exterior cover portion 4F10. Thus, it is bonded to one end of the absorber 8 in a state of being overlapped. Note that, in this specification, the form in which one member and another member are described as overlapping each other is not limited to the form in which members overlap each other in a state where they are in full contact with each other. The concept includes a mode in which a part of a member overlaps the entirety of another member, or a mode in which a part of one member and a part of another member overlap.

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

  On the other hand, as for the cover sheet 4R, the folded portion 4R5 is formed by folding the front end side inward at the border of the folded line 4R6. Hereinafter, a portion of the cover sheet 4R other than the folded portion 4R5 is referred to as an exterior cover portion 4R10. The outer cover portion 4R10 of the cover sheet 4R forms the outer surface of the diaper 1. The return line 4R6 of the cover sheet 4R forms a trunk opening edge 4R9 of the trunk opening 2T in a state where the diaper 1 is assembled. In the folded portion 4R5 of the cover sheet 4R, the first thread rubber 4R1 in an extended state is arranged between the layers of the outer cover portion 4R10. Further, the other end in the longitudinal direction of the inner cover sheet 5R, the pad cover sheet 6, the back sheet 7, and the absorber 8 is sandwiched between the outer cover part 4R10 and the inner cover sheet 5R. In this state, it is adhered in a state of being overlapped on the other end of the absorber 8.

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

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

  In the cover sheets 4F and 4R of the diaper 1, the area where the third thread rubbers 4F3 and 4R3 and the fourth thread rubbers 4F4 and 4R4 are arranged is called a "tammy area RT". The Tammy region RT is a region located below the waist region RW. In the Tammy area RT, the area where the third thread rubbers 4F3 and 4R3 are arranged is called “Tammy first area RT1”, and the area where the fourth thread rubbers 4F4 and 4R4 are arranged is “Tammy second area RT2”. ".

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

  Here, the first thread rubbers 4F1, 4R1 of the waist first region RW1, which are sandwiched in an extended state between the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R in the cover sheets 4F, 4R and adhered, contract. Then, the portion corresponding to the waist first region RW1 of the exterior cover portions 4F10 and 4R10 and the folded portions 4F5 and 4R5 follows the waist first region RW1 and continuously bends in the waist first region RW1 in the waist direction. The first contracted portion S1 is formed to be contracted.

  Also in the waist second region RW2, when the second thread rubbers 4F2 and 4R2, which are sandwiched between the outer cover portions 4F10 and 4R10 and the inner cover sheets 5F and 5R in a stretched state and adhered, contract, the outer portions follow the contraction. The second shrinkage in which the portion corresponding to the waist second region RW2 of the cover portions 4F10 and 4R10 and the inner cover sheets 5F and 5R is continuously bent in a pleated shape, thereby causing the waist second region RW2 to shrink in the waist direction. A portion S2 is formed.

  In the present embodiment, the waist gather G2 is formed mainly by the first contracted portion S1 formed in the first waist region RW1 and the second contracted portion S2 formed in the second waist region RW2. The waist gather G2 improves the fit of the diaper 1 around the waist of the wearer by the contraction force of the first thread rubbers 4F1, 4R1 and the second thread rubbers 4F2, 4R2. In the first contracted portion S1 of the waist gather G2, three first thread rubbers 4F1 and 4R1 are arranged parallel to each other and at a constant interval A1. A plurality of second thread rubbers 4F2 and 4R2 are provided in the second contraction portion S2 of the waist gather G2 in parallel with each other and at a constant interval A2. In the present embodiment, the distance A1 between the first thread rubbers 4F1 and 4R1 in the first contraction portion S1 is set to be larger than the distance A2 between the second thread rubbers 4F2 and 4R2 in the second contraction portion S2. As a result, the first contraction portion S1 assures a moisture discharging function of discharging moisture in the inner space of the diaper 1 to the outside and a function of easily expanding the trunk opening 2T. On the other hand, the second contraction portion S2 of the waist gather G2 increases the contraction force in the waist direction as compared with the first contraction portion S1, and thus has a position holding function (suppression of slippage when the diaper 1 is worn). Function). Here, the interval between the thread rubbers means a dimension in which adjacent thread rubbers are separated in the longitudinal direction of the diaper (the direction connecting the front body region and the back body region).

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

Also in the Tammy first region RT1, when the third thread rubbers 4F3 and 4R3, which are sandwiched between the outer cover portions 4F10 and 4R10 of the cover sheets 4F and 4R and the inner cover sheets 5F and 5R in an extended state and adhered, contract. Following this, of the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R of the cover sheets 4F, 4R,
When the portion corresponding to the Tammy first region RT1 is continuously bent in a pleated shape, a third contraction portion S3 that contracts the Tammy first region RT1 in the waist direction is formed. The third contraction portion S3 is a region that fits near the height of the wearer's hip bone when the diaper 1 is worn. In the present embodiment, the wear is performed by making the contraction force (hereinafter, also referred to as “widening strength”) of the third contraction portion S3 smaller than that of the second contraction portion S2 that secures the position holding function (shift displacement suppressing function). It is good not to give an excessive sense of oppression to a person.

  Also, in the Tammy second region RT2, the fourth thread rubbers 4F4 and 4R4 sandwiched and bonded in an extended state between the layers of the outer cover portions 4F10 and 4R10 and the inner cover sheets 5F and 5R in the cover sheets 4F and 4R. When contracted, the portion corresponding to the Tammy second region RT2 of the outer cover portions 4F10, 4R10 and the inner cover sheets 5F, 5R of the cover sheets 4F, 4R is continuously bent in a pleated shape. A fourth contraction portion S4 for contracting the Tammy second region RT2 in the waist direction is formed. Note that, in the present embodiment, the tammy gather G3 is formed mainly by the third contraction portion S3 formed in the first tammy region RT1 and the fourth contraction portion S4 formed in the second tammy region RT2. The tamper gather G3 improves the fit of the diaper 1 around the lower abdomen of the wearer, for example, by the contraction force of the third thread rubbers 4F3, 4R3 and the fourth thread rubbers 4F4, 4R4.

  Further, in the present embodiment, in order to form the first contracted portion S1 to the fourth contracted portion S4, the thread rubbers 4F1, 4R1, 4F2, 4R2, 4F3, 4R3, 4F4, 4R4 are formed on the cover sheets 4F, 4R. Although it extends along the width direction (the waist direction), it is not limited to thread rubber as long as it is a linear elastic member, and other materials and forms may be used. In this specification, the term “linear” refers to a mode that is elongated and extends in a specific direction, and is a concept that includes a band-like shape and a strip-like shape. In addition, as a material of the thread rubber, natural rubber, synthetic rubber, and the like can be exemplified, but it is not limited to a specific material.

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

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

The ventilation path forming sheets 11F and 11R are stacked and arranged so as to cover at least a part of the folded portions 4F5 and 4R5 forming the skin-facing surface in the first contracted portion S1 of the waist first region RW1. Through the joints to be formed, the pad cover sheet 6 is joined to the end regions in the longitudinal direction and the folded portions 4F5 and 4R5. In the present embodiment, the air passage forming sheets 11F and 11R superimposed on the folded portions 4F5 and 4R5 of the cover sheets 4F and 4R formed of a thermoplastic resin and the pad cover sheet 6 are joined by ultrasonic welding. A portion S is formed. As shown in FIG. 4 (A), a plurality of joints S are intermittently arranged from the trunk opening edges 4F9, 4R9 of the cover sheets 4F, 4R in a longitudinal direction orthogonal to the waist direction (width direction). Accordingly, a linear joint SL extending in the longitudinal direction of the diaper 1 is formed. In other words, one linear joint SL is formed as an aggregate of a plurality of joints S intermittently arranged along the longitudinal direction of the diaper 1. Here, the term “intermittently” means a mode in which they are arranged discontinuously or intermittently.

  As shown in FIG. 4A, a plurality of linear joints SL are intermittently provided in the first contracted portion S1 of the waist gather G2 along the waist direction (width direction) of the cover sheets 4F and 4R. Are located. In the example shown in FIG. 4A, the linear joints SL are provided in parallel with each other, and the intervals between the linear joints SL are set to be alternately large and small. That is, the linear joints SL are intermittently arranged in such a manner that the double lines formed by one set of the linear joints SL are arranged at equal intervals in the waist direction (width direction). In FIG. 3A, a range in which the linear joining portion SL extends in the longitudinal direction of the diaper 1 is illustrated by hatching. As illustrated, the linear joining portion SL extends across the waist first region RW1 where the first contracted portion S1 is formed and the waist second region RW2 where the second contracted portion S2 is formed.

  Ultrasonic bonding of the ventilation path forming sheets 11F and 11R to the folded portions 4F5 and 4R5 is performed in a state where the first thread rubbers 4F1 and 4R1 and the second thread rubbers 4F2 and 4R2 of the waist gather G2 are in an extended state. After the air passage forming sheets 11F, 11R are joined to the folded portions 4F5, 4R5, etc., the expanded state of the first thread rubbers 4F1, 4R1 and the second thread rubbers 4F2, 4R2 sandwiched and fixed between the sheet layers is determined. It is released. As a result, the gap between the linear joining portions SL in the ventilation path forming sheets 11F and 11R is reduced by the contraction of the waist gather G2. As a result, the non-joining region 110 of the ventilation path forming sheets 11F and 11R located between the linear joining portions SL bends and deforms into a waveform.

  As a result, the folded portions 4F5 and 4R5 of the cover sheets 4F and 4R are separated from the non-joining regions 110 of the ventilation path forming sheets 11F and 11R, so that the folded portions 4F5 and 4R5 as shown in FIG. A first air passage 111 surrounded by the non-joining regions 110 of the air passage forming sheets 11F and 11R is formed. Further, the second air passage 112 can be formed on the skin contact surface 11a side of the air passage forming sheets 11F and 11R. The symbol SS indicated by a two-dot chain line in FIG. 4 (D) indicates, as a virtual line, a skin surface that comes into contact with the ventilation path forming sheets 11F and 11R when the wearer wears the diaper 1. The second ventilation path 112 is formed as a gap formed between the skin contact surface 11a of the ventilation path forming sheets 11F and 11R and the wearer's skin when the diaper 1 is worn by the wearer. The moisture in the inner space of the diaper 1 can be discharged to the outside through the first ventilation path 111 and the second ventilation path 112 formed in the waist gather G2. The first ventilation path 111 is a ventilation path through which moisture that has passed through the ventilation path forming sheets 11F and 11R from the inner space of the diaper 1 passes. On the other hand, the second ventilation path 112 is a ventilation path that directly connects the inner space and the outer space of the diaper 1, and can discharge moisture in the diaper 1 more smoothly.

  As shown in FIG. 4D, after the waist gather G2 is contracted, a relatively large first fold 41 and a relatively small second fold 42 forming the first contracted portion S1 are formed. They are formed alternately. Also, in the ventilation path forming sheets 11F and 11R that are bent and deformed in a waveform, relatively large first folds 113 and relatively small second folds 114 are alternately formed. This is because the intervals between the linear joining portions SL are set so as to be alternately large and small. In other words, a large first fold 41, 113 is formed by a pair of linear joints SL having a large space, and a small second fold 42, 114 is formed by a pair of linear joints SL having a small space.

  Here, the first folds 113 of the ventilation path forming sheets 11F and 11R that have been bent and deformed in a corrugated manner cooperate with the first folds 41 that form the first contracted portions S1 to secure a large first ventilation path 111. Contribute. On the other hand, the second folds 114 of the ventilation path forming sheets 11F and 11R form the first ventilation path 111 in cooperation with the second folds 42 that form the first contraction portion S1, and also in the waist direction (width direction). The first folds 113 adjacent to each other are appropriately separated from each other, which contributes to securing the ventilation cross section of the second ventilation path 112. In the present embodiment, the flute structure formed by the ventilation path forming sheets 11F and 11R that deforms into a wavy shape following the contraction of the first contraction portion S1 is provided on the skin contact side of the waist gather G2. The moisture in the diaper 1 can be efficiently discharged to the outside through the first ventilation path 111 and the second ventilation path 112. Further, in the present embodiment, since the linear joint SL is formed as an aggregate of a plurality of joints S intermittently arranged along the longitudinal direction of the diaper 1, the gap between the joints S is formed. , The adjacent first ventilation paths 111 are communicated with each other. Therefore, the ventilation between the adjacent first ventilation paths 111 can be improved, and the wearer can hardly receive a local stuffy feeling.

Furthermore, the ventilation path forming sheets 11F and 11R in the present embodiment are provided with a large number of fine ventilation holes 11F1 and 11R1 for ventilation. Here, the ventilation hole means an opening that allows the space on one side of the sheet to communicate with the space on the other side of the sheet, and its shape is not particularly limited. Therefore, as the ventilation holes 11F1 and 11R1, for example, openings having a shape such as a circle, an ellipse, and a polygon (a triangle, a square, etc.) can be applied. The formation of the ventilation holes 11F1 and 11R1 in the ventilation path forming sheets 11F and 11R does not mean that the ventilation path forming sheets 11F and 11R are made of a material having no air permeability. 11R may be any of a material having air permeability and a material having no air permeability. The air passage forming sheets 11F and 11R are preferably made of a material having air permeability or liquid permeability, but may be an air-impermeable material, for example. But not the size and number specifically limited vents 11F1,11R1, for example, it is preferable that the opening area is formed from 5 to 200 or so if a hole 0.5 to 10 mm ^2.

  As described above, the diaper 1 according to the present embodiment allows the first contraction portion S1 of the waist gather G2, which is located on the side of the torso opening 2T, to ensure the moisture discharging function, and to maintain the position of the diaper 1 (position slippage). In order to make the second contraction part S2 secure the second suppression part S2, the installation mode of the first thread rubbers 4F1 and 4R1 (first elastic member) arranged in the first contraction part S1 and the second contraction part S2 The arrangement of the second thread rubbers 4F2 and 4R2 (second elastic members) to be arranged is made different. That is, by setting the distance A1 between the first thread rubbers 4F1 and 4R1 in the first contracted portion S1 to be larger than the distance A2 between the second thread rubbers 4F2 and 4R2 in the second contracted portion S2, the first contracted portion is reduced. The function of discharging moisture in S1 and the function of suppressing slippage in the second contraction portion S2 are compatible.

  As a result of intensive studies, the present inventors have arranged the first thread rubbers 4F1 and 4R1 forming the first contracted portion S1 at regular intervals, and set the interval A1 to 6.5 mm or more and 20 mm or less. By setting, it has been found that the breathability and the ease of attachment and detachment of the waist gather G2 in the diaper 1 can be improved as compared with the related art, and in particular, setting the interval A1 to be 6.5 mm or more and 13 mm or less in the waist gather G2. From the viewpoint of improving air permeability and ease of attachment / detachment, the present inventors have found that they are even more preferable. Hereinafter, the operation and effect of the diaper 1 according to the embodiment will be described by comparing the diaper 1 according to the embodiment with the diaper 101 according to a comparative example.

FIG. 5 is a diagram schematically illustrating a state in which the diaper 101 according to the comparative example is deployed. FIG. 5A schematically shows the internal structure of the diaper 101 when unfolded as viewed from the left. FIG. 5B schematically shows a planar structure of the diaper 101 when unfolded. The diaper 101 according to the comparative example is the same as the diaper 1 according to the embodiment illustrated in FIG. 3 and the like, except that the number and intervals of the first thread rubbers 4F1 and 4R1 are different. Therefore, in the diaper 101 shown in FIG. 5, the same components as those of the diaper 1 are denoted by the same reference numerals as those of the diaper 1, and the detailed description thereof will be omitted.

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

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

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

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

Here, the first thread rubber 4F1, 4R1 provided in the first contraction portion S1 is adhered to the outer cover portions 4F10, 4R10 and the folded portions 4F5, 4R5 of the cover sheets 4F, 4R, so that the first thread rubber 4F1 is formed. , 4R1, the first fold 41 and the second fold 42 of the cover sheets 4F, 4R, and the first fold 113 and the second fold 114 of the ventilation path forming sheets 11F, 11R are formed by the first thread rubber 4F1, The closer the distance from 4R1 is, the higher the degree of restraint by the first thread rubbers 4F1 and 4R1. On the other hand, the interval A1 between the first thread rubbers 4F1 and 4R1 of the diaper 1 according to the embodiment is wider than the interval B1 between the first thread rubbers 4F1 and 4R1 of the diaper 101 according to the comparative example. Therefore, in the diaper 1 of the embodiment, the first fold 41 and the second fold 42 of the cover sheets 4F and 4R, and the first fold 113 and the second fold 114 of the ventilation path forming sheets 11F and 11R correspond to the diaper 101 of the comparative example. In comparison, the first thread rubbers 4F1 and 4R1 are less likely to receive the binding force as a whole. As a result, compared with the diaper 101 of the comparative example, the diaper 1 of the embodiment has the first fold 41 and the second fold 42 of the cover sheets 4F and 4R, the first fold 113 and the second fold of the ventilation path forming sheets 11F and 11R. The fold 114 can be enlarged.

  As described above, according to the diaper 1 according to the present embodiment, as compared with the diaper 101 according to the comparative example, the size of the first fold 41 and the second fold 42 formed in the first contraction portion S1 of the waist gather G2. Therefore, the ventilation area of the first ventilation path 111 can be further increased. In addition, according to the diaper 1 according to the present embodiment, the size of the first fold 113 and the second fold 114 formed on the ventilation path forming sheets 11F and 11R is larger than that of the diaper 101 according to the comparative example. Can be. Thereby, the ventilation area of the first ventilation path 111 and the second ventilation path 112 can be further increased. As described above, according to the diaper 1 according to the embodiment, the moisture in the diaper 1 can be more smoothly discharged.

  Furthermore, the diaper 1 in the present embodiment is compressed from the outside when the wearer takes a sitting position from a standing position, and the diaper 1 is deformed by the movement of the legs when the wearer walks. Thus, moisture in the diaper 1 can be discharged to the external space through the first ventilation path 111 and the second ventilation path 112, and the interior space of the diaper 1 can be made a comfortable environment. As described above, the pump effect of promoting the discharge of moisture from the inside of the diaper due to the compression deformation of the diaper 1 is different from that of the comparative example in that the first fold 41 and the second fold 42 of the cover sheets 4F and 4R, By combining the first thread rubbers 4F1 and 4R1 in the first contracted portion S1 with the installation mode of the first thread rubbers 4F1 and 4R1, which contribute to increasing the size of the first fold 113 and the second fold 114 of the sheets 11F and 11R, the air permeability of the waist gather G2 is improved. It is possible to obtain a synergistic effect that it can be more significantly improved.

  In the diaper 1 of the present embodiment, the first contracted portion S1 forming the waist gather G2 extends in the longitudinal direction connecting the front body region 1F and the back body region 1R, and extends from the trunk opening 2T. Was set to be 26 mm or more and 31 mm or less. According to this, when the torso opening 2T is widened, the vicinity of the second joint of the finger is just caught on the torso opening edges 4F9, 4R9, so that the diaper 1 is worn by the wearer or conversely when the diaper 1 is removed. There is an advantage that the trunk opening 2T can be easily widened. More specifically, when the region closer to the fingertip than the first joint of the finger is located at the torso opening edge 4F9, 4R9 when the torso opening 2T is widened, the torso opening during the torso opening 2T is widened. The fingertips are likely to come off unexpectedly from the edges 4F9, 4R9. On the other hand, when expanding the torso opening 2T, if the base of the finger deeper than the second joint is located at the torso opening edge 4F9, 4R9, the second position is located below the first contraction portion S1. The 2 contracted portion S2 is wider, and it is difficult to efficiently expand the trunk opening 2T. On the other hand, by setting the extension length of the first contraction portion S1 along the longitudinal direction of the diaper to be 26 mm or more and 31 mm or less, the ease of attaching and detaching the diaper 1 can be improved. In addition, when the diaper 1 is spread, the tips of the fingers do not bite into the ventilation path forming sheets 11F and 11R forming the skin contact surface of the waist gather G2 of the diaper 1, and the ventilation path forming sheets 11F and 11R are damaged. There is also an advantage that this can be suppressed.

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

In the diaper 1 of the present embodiment, the distance A2 between the second thread rubbers 4F2 and 4R2 in the second contraction portion S2 forming the waist gather G2 is set to the distance between the first thread rubbers 4F1 and 4R1 in the first contraction portion S1. Since the size is set to be smaller than A1, it is possible for the second contraction portion S2 to suitably exert the slip-off suppressing function of suppressing the slip-down of the diaper 1. That is, the waist gather G2 as a whole can exert a moisture discharging function of discharging the moisture in the inner space of the diaper 1 to the outside, and can also appropriately suppress the diaper 1 from slipping off.

  In the diaper 1 according to the present embodiment, the width of the second contracted portion S2 extending in the diaper longitudinal direction (the direction orthogonal to the waist direction) is preferably 10 mm or more. By setting the extension width of the second contraction portion S2 as described above, when the operator wears the diaper 1 on the wearer, it is possible to suppress the second contraction portion S2 from digging into the wearer's skin. It will be easier. In the diaper 1 of the present embodiment, it is preferable that the extension width of the second contraction portion S2 in the diaper longitudinal direction is 26 mm or less. By doing so, at the time of wearing the diaper 1, the navel of the wearer is less likely to be covered by the waist gather G2, so that there is an advantage that the wearer is less likely to receive an excessive feeling of pressure.

<Test results>
Hereinafter, a diaper corresponding to an example of the diaper 1 according to the embodiment and a diaper corresponding to the diaper 101 according to the comparative example are prepared, and a quantitative permeability test, a mist ventilation test, and a widening strength test are performed on each diaper. And so on. Hereinafter, a diaper corresponding to an example of the diaper 1 according to the embodiment is referred to as “Example”, and a diaper corresponding to the diaper 101 of the comparative example is referred to as “Comparative example”.

(Ventilation quantitative test)
First, a quantitative permeability test for Examples and Comparative Examples will be described. FIG. 8 is a diagram illustrating the wind speed measurement position in the air permeability quantitative test. The test conditions are as follows: when a diaper to be tested is mounted on a dummy doll, and when 20 L / min of air is injected from the inseam of the dummy doll, the speed (wind speed) of air discharged from the inside of the diaper to the outside is measured. It was measured with an anemometer. For measurement of the wind speed, a commercially available hot-wire anemometer (manufactured by 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. Regarding the number of samples subjected to the test, three types of Big size, L size, and M size were prepared for Examples 1 to 3 and Comparative Examples 1 to 3, respectively, and three samples were prepared for each size. In each of the sizes of the example and the comparative example, the types, the numbers, and the intervals of the first thread rubbers 4F1, 4R1 forming the first contracted portion S1 in the waist gather G2 show the draft rates in the table. As shown in Table 1, Examples 1 to 3 and Comparative Examples 1 and 2 had specifications in which a ventilation path forming sheet was provided in the waist gather G2. On the other hand, Comparative Example 3 was designed so that the waist gather G2 was not provided with a ventilation path forming sheet.

  As shown in FIG. 8, in the quantitative ventilation test, the wind speed was measured at five positions A to E at different distances in the vertical direction from the edge of the trunk opening at the center in the width direction of the rear body of the diaper. It was measured. Here, the up-down direction is a direction orthogonal to the width direction along the outer surface of the diaper. The measurement position A was a position 1 cm above the edge of the trunk opening. As shown in FIG. 8, the measurement positions B to E are located below the trunk opening edge, and the distances from the trunk opening edge are 0.5 cm, 1.5 cm, 2.5 cm, and 3. It was 5 cm.

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

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

  Regarding the measurement position A, it is considered that the flow of the air leaked out from the gap between the waist gather G2 and the skin of the dummy doll becomes dominant. Considering the measurement results of the wind speed at the measurement position A for each of the examples and the comparative examples, as shown in Table 2, Example 1 (the thread rubber interval is 6.5 mm) and Example 2 (the thread rubber interval is 13 mm) ) And Example 3 (thread rubber interval 20 mm), the wind speed is significantly increased as compared with Comparative Example 1 (thread rubber interval 5 mm) and Comparative Example 3 (thread rubber interval 5 mm, no ventilation path forming sheet). The result was obtained. Therefore, in Examples 1 to 3, it can be said that the breathability of the waist gather G2 is significantly improved as compared with Comparative Examples 1 and 3. In addition, it can be evaluated that the air permeability of the waist gather G2 can be improved by securing the interval between the first thread rubbers 4F1 and 4R1 forming the first contracted portion S1 in the waist gather G2 of 6.5 mm or more. In addition, about the measurement position BE, no significant difference was recognized between each Example and each Comparative Example.

  Here, Table 2 also shows the results of the sensory evaluation on the ease of attachment and detachment (easiness of attachment and detachment) of the examples and comparative examples. The sensory evaluation was evaluated by five evaluators. Of 5 evaluators, 4 or more answered good, 3 gave a good score, and 2 or less gave a good x. did. In Comparative Example 1 and Comparative Example 3 in which the interval between the thread rubbers in the waist gather G2 was set to 5 mm, the contraction force of the thread rubber in the waist gather G2 was high, and the thread rubber of the waist gather G2 was stretched when the diaper was worn. Great power was needed. On the other hand, in Examples 1 to 3 in which the interval between the thread rubbers in the waist gather G2 was set in the range of 6.5 mm to 20 mm, when stretching the thread rubber of the waist gather G2 when wearing a diaper, the comparative examples 1 and 3 The result was that it did not require much force and was easy to lift.

  On the other hand, in Comparative Example 2 in which the interval between the thread rubbers in the waist gather G2 was set to 25 mm, the result was that the fingers were not caught and were difficult to pull up because the interval between the thread rubbers was too wide. From this, it can be said that it is preferable to set the interval between the thread rubbers of the waist gather G2 to 20 mm or less from the viewpoint of the ease of attaching and detaching the diaper. In Comparative Example 2, although the breathability of the waist gathers G2 was substantially the same as that of Examples 1 to 3, the comparative example 2 was inferior to Examples 1 to 3 in terms of the ease of attaching and detaching the diaper. You can see that there is. As described above, when judging comprehensively from the viewpoint of the breathability of the waist gather G2 and the ease of attaching / detaching the diaper, the interval between the first thread rubbers 4F1 and 4R1 forming the first contraction portion S1 in the waist gather G2 is 6. It can be evaluated that it is preferable to set the thickness to 5 mm or more and 20 mm or less.

  Also, when comparing the examples, the breathability of the waist gathers G2 is almost the same, but the ease of attaching / detaching the diaper is different from the example 1 (the thread rubber interval of 20 mm) as compared with the example 3 (the thread rubber interval is 20 mm). 5 mm) and Example 2 (thread rubber interval: 13 mm) were more excellent. Accordingly, setting the interval between the first thread rubbers 4F1 and 4R1 forming the first contracted portion S1 in the waist gather G2 to be equal to or greater than 6.5 mm and equal to or less than 13 mm improves the breathability and the ease of attachment / detachment of the waist gather G2. Is particularly preferred.

(Mist aeration test)
Next, test conditions and results of the mist ventilation test for the examples and the comparative examples will be described. The mist ventilation test uses the mist ventilation tester 200 shown in FIG. 9 to attach the diaper of the test object (Example 1, Comparative Example 1) to the diaper attachment part 202 having the mist ejection port 201, When air (flow rate: 5 m / min) containing a constant amount of mist was continuously fed out for 15 seconds, the appearance of the mist that passed through the diaper waist gather to the outside was visually observed. The mist spout 201 has a rectangular shape with a vertical dimension of 25 mm and a horizontal dimension of 25 mm. The diaper to be tested is mounted on the diaper mounting section 202 so that the waist gather G2 is positioned in front of the mist spout 201 and the mist is vented. The test was performed. FIG. 9 shows the diaper mounting section 20.
2 shows a state in which the mist is ejected from the mist ejection port 201 without the diaper attached.

Here, three samples were prepared for each size (Big size, L size, M size) of Example 1 and Comparative Example 1 for the number of samples to be subjected to the mist ventilation test. Table 3 shows the results of the mist ventilation test for the L size and the Big size. Table 4 shows the results of the mist ventilation test for the M size. According to the results of the mist ventilation test for Example 1 and Comparative Example 1, it is found that Example 1 has more mist leaking from the waist gather in the vertical direction than Comparative Example 1. Here, in the first embodiment, since the interval between the first thread rubbers 4F1 and 4R1 forming the first contraction portion S1 in the waist gather G2 is wider than in the comparative example 1, the first contraction portion S1 has a larger fold. Can be formed. As a result, due to a synergistic effect with the waist flute structure including the ventilation path forming sheet, the amount of mist discharged from the ventilation path formed between the waist gather G2 and the diaper attaching section 202 is larger than that in Comparative Example 1. It is considered that Example 1 was increased and the breathability of the waist gather G2 was improved.

[West Gather Enlarged Photo]
FIG. 10A is an enlarged photograph of a fold forming a waist gather according to the example. FIG. 10B is an enlarged photograph of a fold forming waist gathers according to a comparative example. Comparing the example and the comparative example, it is understood that the size of the fold forming the waist gather is larger in the example than in the comparative example. In other words, it can be said that the example has better waist gather permeability than the comparative example.

1. Diaper 1B ... Inseam area 1F ... Front body area 1R ... Rear body area 2T ... Body opening G2 ... Waist gathers 4F, 4R ... Cover sheet 4F1, 4R1 ... First thread rubber 4F2 4R2, second thread rubber 4F3, 4R3, third thread rubber 4F4, 4R4, fourth thread rubber 11F, 11R, air passage forming sheet S, joint S1, first contraction S2, 2 contraction section S3..3rd contraction section S4..4th contraction section

Claims (3)

A front body region that covers the abdomen of the wearer, a back body region that covers the back of the wearer, and a crotch region where the absorber is located between the front body region and the back body region are arranged in series. An absorbent article,
Of the front body region and the back body region, the first body region is provided in a first region proximate a torso opening edge forming a torso opening through which a wearer's torso can be inserted, and extends annularly along the waist direction. the first elastic member is disposed, a first contraction portion for contracting the first region in the waistline direction being,
A ventilation path forming sheet laminated on a sheet member forming the first contraction section so as to cover at least a part of the skin-facing surface in the first contraction section;
With
The first elastic member is adhered to the sheet member,
The ventilation path forming sheet is intermittently joined to the skin-facing surface of the first contraction section along the waist direction by a plurality of joining sections provided at alternating intervals of large and small . The non-joining region located between the joining portions is bent by the shrinkage, and deforms into a wavy shape, whereby the first air passage and the air passage forming sheet surrounded by the non-joining region of the air passage forming sheet face each other. Forming a second ventilation path on the surface side ,
A plurality of the first elastic members are arranged at a constant interval in the first contraction portion, and an interval between the first elastic members is 6.5 mm or more and 20 mm or less;
A range from the trunk opening edge extending in the longitudinal direction in which the first contraction portion connects the front body region and the back body region is 26 mm or more and 31 mm or less,
Among the front body region and the back body region, a second elastic member that is provided in a second region adjacent to the first crotch region with respect to the first region and that extends annularly along the waist direction is provided. A second shrinking portion arranged to shrink the second region in a girth direction,
A plurality of the second elastic members are arranged in the second contraction portion, and a distance between the second elastic members is set to be smaller than a distance between the first elastic members. ing,
Absorbent articles. An interval between the first elastic members is 6.5 mm or more and 13 mm or less;
The absorbent article according to claim 1. The first shrinking portion has a laminated structure in which sheet members are laminated in at least three layers,
The absorbent article according to claim 1.