JP2008229246A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article, with high transpiration performance to sweat in a waist flap. <P>SOLUTION: The device is provided with an absorbent main body 3 and the waist strap F. The waist flap F on the back side comprises a skin abutment surface forming sheet 27 and a non-skin abutment surface forming sheet 21 comprising a hydrophobic sheet, with a hydrophilic sheet 29 disposed between both sheets 27 and 21. Elastic members 24 are disposed between the hydrophilic sheet 29 and the sheet 21, and the waist flap F on the back side has a waist gathering formed of a composite expansible part. The composite expansible part comprises composite expansible part forming sheets 21 and 22 jointed with each other by junction parts, discontinuous in the expansion direction of the composite expansible part, and discontinuous or continuous in the perpendicular direction to it, and the sheets 21 and 22 facing each other form a plurality of pleats continuously extended along the elastic members 24 in plurality. The composite expansible part forming sheets comprise the sheet 22 and the non-skin abutment surface forming sheet 21, or the hydrophilic sheet 29 and the non-skin abutment surface forming sheet 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorbent article having a waist flap, such as a disposable diaper.

  Conventionally, disposable diapers that improve the transpiration of sweat in the waist flap (generally, the portion outward in the longitudinal direction from the absorbent main body including the absorbent core) and prevent the occurrence of rash, etc. Known (for example, see Patent Documents 1 and 2 below). In the disposable diaper shown in FIG. 7 of Patent Document 1 and the disposable diaper described in FIGS. 2 and 6 of Patent Document 2, the skin contact surface and the non-skin contact surface of the waist flap are each formed from a hydrophobic sheet. At the same time, a hydrophilic sheet and an elastic member are disposed inside both hydrophobic sheets. That is, in the disposable diaper described in Patent Documents 1 and 2, the waist flap has a four-layer structure of a hydrophobic sheet, a hydrophilic sheet, an elastic member, and a hydrophobic sheet.

JP-A-8-38548 Japanese Patent Laid-Open No. 2003-235892

However, in the disposable diapers described in Patent Documents 1 and 2, the hydrophobic sheet and the hydrophilic sheet are joined by an adhesive. However, Patent Document 1 discloses a specific application of the adhesive. The form is not described, and Patent Document 2 describes intermittently applying the adhesive, but it is not described in more detail.
Moreover, although it is thought that a wrinkle is formed in the waist flap in the disposable diaper of patent documents 1 and 2 by the contraction force of the said elastic member, 4 of a hydrophobic sheet, a hydrophilic sheet | seat, an elastic member, and a hydrophobic sheet | seat The entire layer structure is integrally formed into a ridge, and it is considered that almost no gap is formed between the hydrophobic sheet and the hydrophilic sheet. In particular, the disposable diaper described in Patent Document 2 is considered to have a prominent tendency because the elastic member in the waist flap has a band shape.

  Therefore, in the disposable diapers described in Patent Documents 1 and 2, the sweat transpiration of the waist flap is not sufficient, and further improvement of the sweat transpiration of the waist flap is desired. This also applies to an absorbent article having a waist flap other than disposable diapers.

  Accordingly, an object of the present invention is to provide an absorbent article comprising an absorbent main body including an absorbent core and a waist flap extending outward in the longitudinal direction from both longitudinal ends of the absorbent main body. An object of the present invention is to provide an absorbent article having a high transpiration property.

  The present invention is an absorbent article comprising an absorbent main body including an absorbent core and waist flaps extending outward in the longitudinal direction from both longitudinal ends of the absorbent main body, and at least a waist flap on the back side The skin contact surface forming sheet for forming the skin contact surface and the non-skin contact surface forming sheet for forming the non-skin contact surface are formed of a hydrophobic sheet, and the skin contact surface forming sheet and the non-skin contact A hydrophilic sheet is disposed between the contact surface forming sheet and an elastic member is disposed between the hydrophilic sheet and the non-skin contact surface forming sheet. A waist gather formed from the stretchable part is provided, and the composite stretchable part is configured such that the facing composite stretchable part forming sheet is intermittent in the stretchable direction of the composite stretchable part and intermittent or continuous in a direction perpendicular thereto. Depending on the joint Each of the composite stretchable part forming sheets that are joined and face each other is formed by forming a plurality of ridges extending continuously over a plurality of composite stretchable part forming elastic members, and facing the composite stretchable part. The part forming sheet is composed of another sheet and a non-skin contact surface forming sheet interposed between the hydrophilic sheet and the non-skin contact surface forming sheet, or the hydrophilic sheet and the non-skin contact surface forming The above object is achieved by providing an absorbent article comprising a sheet.

  According to an absorbent article of the present invention, in an absorbent article comprising an absorbent main body including an absorbent core and a waist flap extending outward in the longitudinal direction from both longitudinal ends of the absorbent main body, the waist flap High sweat transpiration.

Hereinafter, the absorbent article of the present invention will be described based on the first embodiment with reference to the drawings. In the following description of the embodiment, when referring to “disposable diapers” or “diapers”, they are substantially synonymous with the “absorbent article” of the present invention.
In the first embodiment, the absorbent article of the present invention is applied to a pants-type disposable diaper. As shown in FIGS. 1 to 5, the absorbent main body 3 including the absorbent core 34 and the longitudinal length of the absorbent main body 3. Waist flaps F and F respectively extending outward in the longitudinal direction from both ends in the direction.

  The waist flaps F, F on the back side and the abdomen side are a hydrophobic sheet in which the skin contact surface forming sheet 27 forming the skin contact surface and the non-skin contact surface forming sheet 21 forming the non-skin contact surface are hydrophobic sheets. Consists of. A hydrophilic sheet 29 is disposed between the skin contact surface forming sheet 27 and the non-skin contact surface forming sheet 21, and an elastic member is provided between the hydrophilic sheet 29 and the non-skin contact surface forming sheet 21. 24 is arranged.

The pants-type disposable diaper 1 according to the first embodiment includes, in addition to the absorbent main body 3, an outer packaging material 2 joined to the non-skin contact surface side of the absorbent main body 3, and longitudinal end portions of the absorbent main body 3. And a pressing sheet 27 that covers the skin contact surface side.
The outer packaging material 2 is divided into an abdominal side A, a crotch C, and a back side B in the longitudinal direction. Both side edges of the ventral side A and the back side B of the outer packaging material 2 are joined together to form a pair of side seals 11, a waist opening 12, and a pair of leg openings 13.

The outer packaging material 2 includes an outer layer sheet 21, an inner layer sheet 22, and a plurality of elastic members 23 (23A, 23B), 24, 25, and 26 disposed between the sheets 21, 22. The outer layer sheet 21 forms the outer surface of the diaper, and the inner layer sheet 22 is disposed on the inner surface side of the outer layer sheet 21. That is, the non-skin contact surface forming sheet is composed of the outer layer sheet 21.
The pressing sheet 27 is configured integrally with the outer layer sheet 21 and is folded back to the skin contact surface side of the absorbent main body 3. That is, the skin contact surface forming sheet includes the pressing sheet 27.

  In the present invention, the skin contact surface forming sheet and the non-skin contact surface forming sheet are made of a hydrophobic sheet. In the first embodiment, the skin contact surface forming sheet and the non-skin contact surface forming sheet are the pressing sheet 27 and the outer layer sheet 21 that are integrally configured, respectively, and thus are configured integrally. The sheet is made of a hydrophobic sheet. The inner layer sheet 22 is also made of a hydrophobic sheet.

The “hydrophobic sheet” in the present invention refers to a sheet having a water pressure of 1 to 10 gf / cm ² , preferably 1 to 5 gf / cm ² measured by the following [Method for measuring water pressure]. The basis weight of the hydrophobic sheet is preferably 5 to 50 g / m ² , particularly preferably 7 to 30 g / m ² .
[Measurement method of water pressure resistance]
A sample sheet is sandwiched between two cylindrical tubes with a diameter of 35 mm connected vertically, and physiological saline is poured into the upper cylindrical tube at a rate of 4 g / min. Measure the time for the saline to pass through the sample sheet and begin to flow into the lower cylindrical tube. The liquid volume (weight) is calculated from the flow rate of physiological saline and the time until it passes through the sample sheet. A value obtained by dividing the calculated liquid amount (gf) by the cross-sectional area (cm ² ) of the cylindrical tube is defined as a water pressure resistance (gf / cm ² ).

  As a hydrophobic sheet for forming the pressing sheet 27 (skin contact surface forming sheet), the outer layer sheet 21 (non-skin contact surface forming sheet) and the inner layer sheet 22, a flexible composite stretchable part having a beautiful appearance and good touch From the viewpoint of forming No. 4 ridges 43 (details will be described later), it is preferably a single-layer sheet or a laminated sheet made of an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric or the like.

The hydrophilic sheet is a sheet 29 different from both the outer layer sheet 21 and the inner layer sheet 22, and is disposed on the non-skin contact surface side of the longitudinal end portion of the absorbent main body 3. That is, the hydrophilic sheet 29 is disposed between the pressing sheet 27 and the inner layer sheet 22 in the waist flap F, and the non-skin contact surface of the absorbent main body 3 in the waistline portion D described later. Between the side and the inner layer sheet 22.
The pressing sheet 27 and the hydrophilic sheet 29 face each other without any other sheet. The pressing sheet 27 and the hydrophilic sheet 29 are joined by a hot melt adhesive or the like (not shown in FIG. 5; see FIG. 15).

  The hydrophilic sheet 29 and the inner layer sheet 22 face each other without interposition of other sheets. The non-skin contact surface side of the hydrophilic sheet 29 is joined to the inner layer sheet 22. The joining means of the hydrophilic sheet 29 and the inner layer sheet 22 is not particularly limited, and for example, a hot melt adhesive, a heat seal, an ultrasonic seal or the like is used. Further, the hydrophilic sheet 29 and the inner layer sheet 22 can be bonded using the bonding portion 41 of the composite stretchable portion 4 as described in detail in the description of the manufacturing method described later.

  The detail of the structure of the disposable diaper 1 of 1st Embodiment is demonstrated. As shown in FIGS. 1 to 5, the disposable diaper 1 of the first embodiment is disposed between a liquid-permeable top sheet 32, a liquid-impermeable or water-repellent back sheet 33 and both sheets 32, 33. A substantially vertically long absorbent main body 3 having a liquid-retaining absorbent core 34 and an outer packaging material 2 bonded to the back sheet 33 side (non-skin contact surface side) of the absorbent main body 3. Yes. The absorbent main body 3 is disposed across the ventral side A to the back side B of the outer packaging material 2, but the longitudinal end of the absorbent main body 3 is more than the longitudinal end of the outer packaging 2. Retreats inward in the longitudinal direction. The absorptive main body 3 is joined to the inner layer sheet 22 of the outer packaging material 2 by a main body joining portion 15 such as an adhesive, a heat seal, and an ultrasonic seal.

  The outer wrapping material 2 has an hourglass shape in which both side edges are bound inward in the central portion in the longitudinal direction, and defines the outline of the diaper. The outer packaging material 2 is divided in the longitudinal direction into an abdominal side A disposed on the abdomen side of the wearer, a back side B disposed on the back side, and a crotch C positioned therebetween. The ventral side A and the back side B correspond to the longitudinal front and rear portions of the outer packaging material 2, respectively, and the crotch portion C corresponds to the longitudinal central portion of the outer packaging material 2. As for the outer packaging material 2, the both-sides edge part of the ventral | abdominal side part A and the both-sides edge part of the back side part B are mutually joined, and the waist opening part 12 and a pair of leg opening part 13 are formed in the disposable diaper 1. . By this joining, a pair of side seal parts 11 and 11 are formed on the left and right side edges of the disposable diaper 1 to form a pant-type. For this joining, heat sealing, high frequency sealing, ultrasonic sealing or the like is used.

  The top sheet 32, the back sheet 33, and the absorbent core 34 are each rectangular, and are integrated to form the vertically long absorbent main body 3. As the surface sheet 32, the back surface sheet 33, and the absorptive core 34, the thing similar to what was conventionally used for this kind of diaper can be used, respectively. For example, as the absorptive core 34, what is comprised from the particle | grains and fiber material of an absorptive polymer, and was coat | covered with the tissue paper (not shown) can be used.

  As shown in FIG. 6, the absorbent core 34 in the present embodiment includes an hourglass-shaped central absorbent body 34A and a pair of side absorbent bodies 34B and 34B provided symmetrically on both sides of the central absorbent body 34A. It has. The central absorbent body 34A and the pair of side absorbent bodies 34B and 34B are separated from each other at least in the center in the longitudinal direction. One side in the longitudinal direction and the other side in the longitudinal direction of the side absorbent body 34B are connected to each other at one side in the longitudinal direction and the other side in the longitudinal direction of the central absorbent body 34A, respectively. Therefore, the cut-out portions 34C and 34C are formed between the center absorbent body 34A and the pair of side absorbent bodies 34B and 34B, respectively.

The one part in the longitudinal direction, the central part in the longitudinal direction, and the other part in the longitudinal direction are each region when the absorbent core 34 is divided into three regions so as to be divided into approximately three equal parts in the longitudinal direction.
When the absorbent core 34 has the separation portion 34 </ b> C, both side edges of the absorbent core 34 easily stand up. Further, when the absorbent core 34 is pressed in the width direction, the entire width of the absorbent core 34 is narrowed, so that the shrinkage in the width direction of the outer packaging material 2 is difficult to be inhibited.

  The shape of the absorbent core 34 in plan view is not limited to the shape shown in FIG. 6. For example, the side absorbent body 34 </ b> B is connected to the central absorbent body 34 </ b> A only in one of the longitudinal direction one part or the longitudinal direction other part. May be a shape in which the side absorber 34B is not connected (separated) to the central absorber 34A, or a shape that does not have the separation portion 34C (none of which is shown).

  As shown in FIGS. 2 to 4, side cuffs 35, 35 made of a liquid-resistant or water-repellent and breathable material are provided on both sides in the longitudinal direction of the absorbent main body 3. In FIG. 5, the illustration of the side cuffs 35 is omitted. In the vicinity of the free end of each side cuff 35, a side cuff elastic member 36 is disposed in an expanded state. Accordingly, when the disposable diaper 1 is worn, the side cuff elastic member 36 contracts, whereby the side cuff 35 stands up, and the outflow of the liquid in the width direction of the absorbent main body 3 is prevented. As shown in FIGS. 3 and 4, the side cuff forming sheet 37 for forming the side cuff 35 has a back surface sheet 33 with a portion 37 </ b> A having a predetermined width outside the width direction of the absorbent main body 3 in the diaper state. And is fixed between the absorbent core 34 and the back sheet 33.

  As shown in FIGS. 2, 3, and 5, the outer packaging material 2 includes an outer layer sheet 21, an inner layer sheet 22, and a plurality of elastic members 23, 24, 25, and 26 disposed between the sheets 21 and 22. Is formed.

  The outer layer sheet 21 and the inner layer sheet 22 have the same shape, and the waist elastic member 24 includes the vicinity of the longitudinal end portion of the outer layer sheet 21 and the longitudinal end portion of the inner layer sheet 22 as shown in FIGS. It is clamped and fixed between the vicinity. The outer layer sheet 21 is configured integrally with the pressing sheet 27. The pressing sheet 27 extends outward in the longitudinal direction from the longitudinal end of the outer layer sheet 21, and is folded back to the skin contact surface side of the absorbent main body 3.

Almost the entire region on the skin contact surface side of the waistline portion D (details will be described later) including both ends in the longitudinal direction of the absorbent main body 3 is covered with a folded pressing sheet 27. In the pressing sheet 27, the portions overlapping the both ends in the longitudinal direction of the absorbent main body 3 are bonded via an adhesive (not shown) over substantially the entire width of the absorbent main body 3. Both ends in the longitudinal direction of the main body 3 are fixed to the outer packaging material 2.
The skin contact surface side at both longitudinal ends of the absorbent main body 3 is covered with the pressing sheet 27, thereby preventing the longitudinal both ends of the absorbent main body 3 from coming into direct contact with the wearer and absorbing. It is possible to prevent leakage of the absorbent polymer of the absorbent core 34 from both ends in the longitudinal direction of the main body 3.

The inner surface of the outer layer sheet 21 (the surface facing the inner layer sheet 22) is coated with an adhesive such as a hot melt adhesive in a predetermined shape. The adhesive corresponds to almost the entire region corresponding to the side seal portion 11 shown in FIG. 2, the region corresponding to the non-functionalized region 51 (described later) of the waistline elastic member 23, and the leg elastic member cutting region 52 (described later). It is applied to the area.
On the other hand, the adhesive is not applied to almost the entire region corresponding to the composite stretchable portion 4 (details will be described later) and almost all the region corresponding to the crotch C.

  An adhesive such as a hot-melt adhesive is applied to the surface of the inner layer sheet 22 facing the outer layer sheet 21 in a predetermined shape. The adhesive is applied to almost the entire region other than the region corresponding to the composite stretchable portion 4.

  Thus, the adhesive coating shape on the inner layer sheet 22 facing the outer layer sheet 21 includes the adhesive coating shape on the inner surface of the outer layer sheet 21. Therefore, when the outer layer sheet 21 and the inner layer sheet 22 are bonded together, the adhesive applied to the inner layer sheet 22 on the surface facing the outer layer sheet 21 is also disposed on the inner surface of the outer layer sheet 21, and as a result, the outer layer sheet The adhesive is also applied to the inner surface of the sheet 21 in the coating shape of the inner layer sheet 22 facing the outer layer sheet 21.

  As shown in FIGS. 3 and 5, the hydrophilic sheet 29 has an outer end portion (in the longitudinal direction of the absorbent article) and an end portion in the longitudinal direction of the inner layer sheet 22. The inner end (in the direction) is located on the non-skin contact surface side of the absorbent main body 3. Specifically, the inner end portion of the hydrophilic sheet 29 extends to a position that covers the region where the waistline elastic member 23A that forms the upper waistline portion D1 (details will be described later) is present.

The hydrophilic sheet 29 may be formed from inherently hydrophilic fibers, and is not inherently hydrophilic, but has been imparted with hydrophilicity by being subjected to a hydrophilic treatment. However, the latter is preferred.
Examples of inherently hydrophilic fibers include cellulosic fibers such as rayon, acetate, and cotton.

  Examples of the hydrophilic treatment for fibers that do not have hydrophilicity include fiber surface treatment with a hydrophilic treatment agent, and kneading of the hydrophilic treatment agent into the fiber. Examples of fibers that are not inherently hydrophilic include, for example, polyolefin resins such as polyethylene (PE) and polypropylene (PP), fibers using a polyester resin such as polyethylene terephthalate (PET), or a plurality of these. The thing which uses as a raw material the composite fiber (core-sheath type, side-by-side type, etc.) using resin etc. is mentioned. As the core-sheath type composite fiber, a core-sheath type composite fiber having a relatively low melting point component as a sheath and a relatively high melting point component as a core is preferable. Particularly, a low melting point component is polyethylene, and a high melting point component is preferable. A core-sheath type composite fiber of polypropylene or polyethylene terephthalate is preferable.

The hydrophilic sheet 29 preferably has high liquid diffusibility and low liquid retention. Specifically, the liquid diffusibility of the hydrophilic sheet 29, a liquid distribution area measured by the following [Measurement method of the liquid spread area] is preferably at 2 cm ² or more, further not less 5 cm ² or more preferable. The greater the liquid diffusion area of the hydrophilic sheet 29, the better the sweat transpiration of the waist flap F. Examples of the hydrophilic sheet 29 having such a liquid diffusion area include a nonwoven fabric obtained by hydrophilizing a SMMS nonwoven fabric (spunbond-meltblown-meltblown-spunbond nonwoven fabric) composed of PP fibers, and a spunlace nonwoven fabric composed of rayon and PET. It is done.

[Measurement method of liquid diffusion area]
A sample of a hydrophilic sheet cut into 10 cm × 10 cm squares is placed on an acrylic plate, and 0.05 mL of colored water is dropped onto the acrylic sheet from above by 30 mm. After 10 minutes, the diffusion area of the colored water is measured using an image analyzer.

The liquid retention of the hydrophilic sheet 29 is preferably 30 g / m ² or less, preferably 5 g / m ² or less, as measured by the following [Method for measuring liquid retention]. Further preferred. The smaller the amount of liquid retained in the hydrophilic sheet 29, the higher the sweat transpiration when the hydrophilic sheet 29 absorbs sweat continuously. As the hydrophilic sheet | seat 29 which has this liquid retention amount, the nonwoven fabric which hydrophilized the SMMS nonwoven fabric which consists of PP fiber is mentioned, for example.

[Measurement method of liquid holding amount]
The weight of the sample of the hydrophilic sheet cut into 10 cm × 10 cm square is weighed, and the sample is put in a beaker containing 500 mL of distilled water and left for 1 minute. Then, a sample is taken out and this sample is left to stand for 10 minutes in a state of being hung on a basket. Thereafter, the sample is subjected to centrifugal dehydration (800 rpm) for 10 minutes, then its mass is measured, and the amount of liquid retained is determined from the following formula.
Liquid retention amount (g / m ² ) = {mass of sample after centrifugal dehydration (g) −mass of initial sample (g)} / area of initial sample (m ² )}

  In the disposable diaper 1 of this embodiment, as shown in FIG.3 and FIG.4, between the outer-layer sheet | seat 21 and the inner-layer sheet | seat 22 in each of the ventral | abdominal part A and the back | dorsal part B, in the side seal part 11, They are joined to each other by a seal, a high frequency seal, an ultrasonic seal or the like.

  The waist flap F and the waistline portion D in the ventral side A and the backside portion B of the outer packaging material 2 are respectively provided with a waist gather G2 and a waistline gather G1 formed from the composite stretchable part 4 (details will be described later). Yes. In addition, in the form in which the outer packaging material 2 is joined to the non-skin contact surface side of the absorbent main body 3 as in the first embodiment, the waist flap F is only the outer region in the longitudinal direction of the absorbent main body 3. In addition, it is assumed to include both outer regions in the width direction of the region.

  The waist gather G2 will be described in detail. A plurality of waist elastic members 24 are disposed along the peripheral edge of the waist opening 12 in the waist flap F in each of the abdominal side A and the back side B. A composite stretchable part 4 (details will be described later) is formed mainly of the pressing sheet 27, the hydrophilic sheet 29, the inner layer sheet 22, the waist elastic member 24, and the outer layer sheet 21. A waist gather G2 is formed between the side seal portions 11 (over the entire circumference of the waist flap F).

  The outer packaging material 2 is provided with a leg gather G3 along a pair of leg openings 13. More specifically, a plurality of leg elastic members 25 are arranged along each peripheral edge of the leg opening 13 curved in the crotch part C. The leg elastic member 25 is fixed in an extended state between the outer layer sheet 21 and the inner layer sheet 22. Thereby, a leg gather G3 is formed along the leg opening 13.

  In the present embodiment, the leg elastic member 25 includes a plurality of members disposed over half of the peripheral edge of the leg opening 13 near the ventral side A in relation to the manufacturing method described later. In addition, by combining a plurality of members disposed over the half near the back side portion B, it is disposed so as to cover the entire periphery of the leg opening 13, but depending on the manufacturing method, One leg elastic member 25 can be disposed over the entire periphery of the leg opening 13.

  The waistline gather G1 will be described in detail. A waistline gather D1 formed from a composite stretchable part 4 (details will be described later) is provided in the waistline part D of the abdomen side A and the back side part B of the outer packaging material 2. The waistline portion D refers to a region from the lower side of the waist flap F to the upper end of the leg opening 13. The waistline portion D will be described in detail. The waistline portion D is provided with a plurality of waistline elastic members 23 along the width direction. The waistline elastic member 23 extends between the vicinity of the side edge of the absorbent main body 3 and the side seal portion 11, and is not disposed between the vicinity of the side edge of the absorbent main body 3.

The composite stretchable part 4 is formed mainly by the pressing sheet 27, the hydrophilic sheet 29, the inner layer sheet 22 (there is a region where this is not provided, details will be described later), the waistline elastic member 23, and the outer layer sheet 21. A pair of waistline gathers G1 disposed in the width direction between the vicinity of the side edge of the absorbent main body 3 and the side seal portion 11 is formed in the width direction by the stretchable portion 4. The waistline gather G1 is not disposed between the side edge portions of the absorbent main body 3.
The “near side edge of the absorbent main body 3” refers to a region within 30 mm inward in the width direction and within 20 mm outward in the width direction from the side edge of the absorbent main body 3.

The waistline portion D is further divided in the longitudinal direction into an upper waistline portion D1 and a lower waistline portion D2 below the upper waistline portion D1. When the diaper 1 is worn, the upper waistline portion D1 is preferably located in a region that abuts on a portion (hereinafter also referred to as “iliac region”) from the wearer's iliac crest to the upper anterior iliac spine.
In the present embodiment, as shown in FIG. 5, the hydrophilic sheet 29 is entirely or mostly disposed in the upper waistline portion D1, but not or almost disposed in the lower waistline portion D2. Absent. That is, in the waistline portion D, a region (mainly the upper waistline portion D1) in which four sheets of the pressing sheet 27, the hydrophilic sheet 29, the inner layer sheet 22, and the outer layer sheet 21 are laminated, the pressing sheet 27, the inner layer There is a region where the three sheets of the sheet 22 and the outer layer sheet 21 are laminated (mainly the lower waistline portion D2).

The iliac crest and superior anterior iliac spine are anatomical terms. The iliac crest is a part indicated by reference sign Q1 in FIG. 7, and the upper anterior iliac spine is a part indicated by reference sign Q2 in FIG.
Conventionally, in order to prevent slippage during wearing of a pant-type diaper, particularly when the diaper is for infants, the tightening pressure of the elastic member disposed on the waist flap is increased, and the waist flap is used. It has been considered effective to bring the pants-type diaper into close contact with the wearer's body by tightening.

  However, in order to effectively prevent slipping during wearing of pants-type diapers, the tightening pressure of the diaper corresponding to the wearer's iliac area is higher than the conventional tightening pressure of the waist flap. It has also been found that it is effective to increase it. The reason for this is that the wearer (especially infants) overhangs the abdomen as a physical feature, so if the tightening pressure of the waist flap that comes in contact with the overhanging abdomen is increased, the tightening pressure is high. This is because the flaps are gradually narrowed down and the waist flaps are shifted down to a site where the abdomen becomes thinner.

FIG. 8 shows a state in which the baby's body is regarded as a cone. In the figure, θ represents an angle formed by a perpendicular to the tangent line at the waist flap (point A) and a horizontal line toward the center of the body. F indicates the tightening force of the elastic member, P indicates the frictional force resulting from the tightening force F, f1 indicates the displacement force due to the tightening force F, and f2 indicates the vertical drag. Here, since f1 = Fsinθ and P = νN = νf2 = νFcosθ (ν represents a friction coefficient), the “slip-off force Z” directed downward at the point A is represented by the following equation.
Z = f1−P = Fsinθ−νFcosθ = F (sinθ−νcosθ)
From this equation, it can be understood that when the waist flap is in a state in which slipping occurs, the slipping force increases as the tightening force F increases.

  A portion (iliac region) from the wearer's iliac crest to the upper anterior iliac spine has a certain width, and the upper waistline D1 of the diaper 1 is fixed to the iliac region within the range of the width. The diaper 1 can be effectively prevented from falling off. From this viewpoint, in the diaper 1 of the present embodiment, the width of the upper waistline portion D1 (that is, the length of the upper waistline portion D1 along the longitudinal direction of the diaper 1) is set to 12 to 35 mm. When this width is 20 to 35 mm, particularly 25 to 30 mm, the diaper 1 can be prevented from slipping off more effectively, and the appearance of the diaper 1 in the wearing state and the wearing operation of the diaper 1 (easy to wear) Etc.) can be further improved.

  In the state where the diaper 1 is worn, the size of the diaper 1 and the wearer are determined so that the upper waistline portion D1 abuts on a portion (iliac region) from the wearer's iliac crest to the upper anterior iliac spine. The relationship with the physique is important. For example, when considering an infant who is a main wearer of a pants-type diaper, as shown in FIG. 2, when the diaper 1 is deployed, the center position of the upper waistline D1 of the abdominal side A (the longitudinal direction of the diaper 1) Center distance CL between the longitudinal center line CL of the diaper 1 and 180 to 230 mm, and in the unfolded state of the diaper 1, the center position of the upper waistline portion D1 of the back side B (the diaper 1 The upper waistline D1 can be successfully brought into contact with the wearer's iliac region by setting the distance K2 between the longitudinal center line CL of the diaper 1 and the longitudinal center line CL of the diaper 1 to 180 to 230 mm. it can.

This value is determined by carrying out body measurements of about 350 infants who are the main wearees of pants-type diapers. Specifically, as shown in FIG. 9, this value is obtained by setting the left and right center points of the ventral side at the horizontal position height of the upper anterior iliac spine as “the upper anterior iliac spine height front center” The center point of the dorsal side at the horizontal position of the iliac spine is defined as the “upper center of the upper anterior iliac spine” and the upper anterior iliac bone via the crotch from the center of the upper anterior iliac spine. The length to the center after the height of the spine is defined as the “upper and lower length of the superior anterior iliac spine”, and the numerical value obtained by adding the necessary length considering the thickness of the diaper material, etc. It is a bisection. By setting the distances K1 and K2 to 185 to 220 mm, particularly 195 to 215 mm, the upper waistline portion D1 can be brought into more successful contact with the wearer's iliac region.
In the case of an adult diaper, the upper waistline D1 can be brought into more successful contact with the wearer's iliac region by setting the distances K1 and K2 to 300 to 350 mm, particularly 305 to 335 mm.

In addition, in the case where the position of the peripheral edge of the waist opening 12 on the ventral side and the position of the peripheral edge of the waist opening 12 on the back side are not substantially deviated from the longitudinal center line CL of the diaper 1. , Refers to a straight line along the diaper width direction that passes through the midpoint in the longitudinal direction of the diaper 1 in the unfolded state.
On the other hand, for example, when the position of the peripheral edge of the waist opening 12 on the ventral side and the position of the peripheral edge of the waist opening 12 on the back side are shifted (not shown), they are shifted and extended. A diaper longitudinal center line CL is defined on the assumption that there is no region.

  In the diaper 1 according to the present embodiment, the diaper 1 is fixed to the wearer's body mainly by the tightening force of the waistline elastic member 23A disposed in the upper waistline portion D1. In other words, unlike the conventional pants-type diaper, the tightening force by the waist elastic member 24 arranged on the waist flap F is the main for fixing the diaper 1 to the wearer's body in the diaper 1 of the present embodiment. It is not a means. Conversely, if the tightening force of the waist flap F is increased, the diaper 1 will be promoted to slip off.

  However, in the present invention, since the skin contact surface side of the waist flap F is formed of a hydrophobic sheet, if the tightening force of the waist flap F does not have a certain size, the skin contact of the waist flap F Since the sweat adhering to the contact surface side is not absorbed by the hydrophilic sheet through the hydrophobic sheet, it is preferable that the tightening force of the waist flap F has a certain size or more. The fastening force of the waist flap F is preferably 0.2 kPa or more, more preferably 0.5 kPa or more.

  When the diaper 1 is worn, the lower waistline portion D2 is preferably in contact with the lower region (lower abdomen) of the wearer's iliac region. The width of the lower waistline portion D2 (that is, the length of the lower waistline portion D2 along the longitudinal direction of the diaper 1) is preferably 40 to 70 mm, particularly 45 to 65 mm. A plurality of waistline elastic members 23B are disposed in the lower waistline portion D2.

  Further, when the tensile loads of the waist flap F, the upper waistline portion D1, and the lower waistline portion D2 are compared, the tensile load of the upper waistline portion D1 is the highest, and then the tensile load of the lower waistline portion D2 is the highest. It is preferable that the tensile load is the lowest. By providing such an order in the tensile load of each part, the diaper 1 during wearing is effectively prevented from slipping off, and the diaper 1 adheres to the wearer's body without a sense of incongruity, and liquid leakage is effective. Is prevented.

  Next, the front crotch E will be described. The front crotch portion E refers to the foremost region when the crotch portion C is divided into four in the longitudinal direction. In the front crotch part E, a plurality of front crotch elastic members 26 are arranged over the entire width direction. The front crotch elastic member 26 is fixed in an expanded state between the outer layer sheet 21 and the inner layer sheet 22. Thereby, the front crotch gather G4 is formed in the front crotch E.

  A non-functionalized region 51 that prevents the elastic member from contracting is formed in a region of the outer packaging material 2 facing the absorbent main body 3. The non-functionalized region 51 in the present embodiment is formed without expressing the contraction force of the waistline elastic member 23 and the front crotch elastic member 26. As described in detail in the description of the manufacturing method described later, the non-functionalized region 51 is a continuous body 23S of the waistline elastic member 23 and the front crotch elastic that are disposed across the entire width direction of the outer packaging material 2 in the raw material state. The continuous body 26S of the member 26 is a region formed without partially expressing the contraction force. In order to prevent the contraction force from appearing, for example, a large number of convex portions and cutter blades that divide the elastic member, a large number of emboss pins that harden the elastic member by heat sealing, and the like are used.

By forming the non-functionalized region 51, a pair of separated in the width direction from the waistline elastic member continuous body 23 </ b> S and the front crotch elastic member continuous body 26 </ b> S disposed over the entire width direction of the outer packaging material 2. A waistline gather G1 and a front crotch gather G4 are formed.
The non-functionalized region 51 located between the pair of waistline gathers G1 in the width direction is formed without causing the contraction force to be exerted on the waistline elastic member continuous body 23S joined to the outer layer sheet 21 and the inner layer sheet 22. On the other hand, the non-functionalized region 51 located between the pair of front crotch gathers G4 in the width direction is the front crotch elastic member continuous body 26S joined to the outer layer sheet 21 and the inner layer sheet 22. It is formed without developing the contractile force. Thereby, shrinkage | contraction of the absorptive main body 3 can be prevented, and the favorable external appearance and absorption performance of the absorptive main body 3 can be implement | achieved.

A leg elastic member cutting region 52 is formed at a position that is the center of the crotch C in the width direction. The leg elastic member cutting region 52 is a continuous body 25S of leg elastic members 25 arranged in a curved shape in the entire width direction of the outer packaging material 2 in the raw material state, as will be described in detail in the description of the manufacturing method described later. Is a region cut at a position that is the central portion in the width direction of the crotch portion C. In order to form the leg elastic member cutting region 52, for example, a large number of convex portions and cutter blades that divide the elastic member are used.
By forming the leg elastic member cutting region 52, the leg elastic member continuous body 25 </ b> S disposed in a curved shape in the entire width direction of the outer packaging material 2, in the width direction center of the crotch C in the width direction. A pair of separated leg elastic members 25, 25 are formed.

In the present embodiment, the composite stretchable part 4 is not provided in the crotch part C of the outer packaging material 2. Thereby, the urine excreted in front of the absorbent main body 3 can be smoothly transferred to the rear, and the absorption performance is remarkably improved.
As the leg elastic member 25 and the front crotch elastic member 26, elastic materials such as natural rubber, polyurethane resin, foamed urethane resin, and hot melt elastic member are formed into a thread shape (thread rubber) or a belt shape (flat rubber), respectively. Those formed are preferably used.

  Next, the composite elastic part 4 which forms the waist gather G2 and the waistline gather G1 in this embodiment is explained in full detail. As shown in FIGS. 10 and 11, the composite stretchable part 4 has the following configurations (1) to (3).

(1) The facing composite stretchable part forming sheets 21 and 22 are joined to each other by an intermittent joining part 41 in the stretchable direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto.
(2) The composite stretchable portion forming elastic member 42 is disposed so as not to pass through the joint portion 41 and is fixed to the composite stretchable portion forming sheets 21 and 22 at portions excluding both ends of the composite stretchable portion forming elastic member 42. It has not been.
(3) Each of the facing composite stretchable part forming sheets 21 and 22 forms a plurality of ridges 43 extending continuously over a plurality of composite stretchable part forming elastic members 42.

In the waist gather G2, the pressing sheet 27 that is a skin contact surface forming sheet, the hydrophilic sheet 29, the inner layer sheet 22, and the outer layer sheet 21 that is a non-skin contact surface forming sheet are provided over the entire area. Sheets are stacked. On the other hand, in the waistline gather G1, an area in which four sheets of the pressing sheet 27, the hydrophilic sheet 29, the inner layer sheet 22, and the outer layer sheet 21 are laminated (in the present embodiment, mainly the upper waistline part D1) and the pressing member. There is a region (mainly the lower waistline portion D2 in the present embodiment) in which three sheets of the attachment sheet 27, the inner layer sheet 22, and the outer layer sheet 21 are laminated. Here, the region where the four sheets are stacked will be described, the description of the region where the three sheets are stacked will be omitted, and the description of the region where the four sheets are stacked will be cited.
10 and 11, the pressing sheet 27, the hydrophilic sheet 29, and the inner layer sheet 22 are integrally illustrated.

  In the present embodiment, the facing composite stretchable part forming sheet is an inner layer sheet 22 that is another sheet interposed between the hydrophilic sheet 29 and the outer layer sheet 21 that is a non-skin contact surface forming sheet. It consists of the outer layer sheet | seat 21 which is a skin contact surface formation sheet. Here, “another sheet” means a sheet different from any of the skin contact surface forming sheet (pressing sheet 27), the non-skin contact surface forming sheet (outer layer sheet 21), and the hydrophilic sheet 29.

In the present embodiment, the waist gather G2 formed from the composite stretchable part 4 is mainly composed of a pressing sheet 27, a hydrophilic sheet 29, an inner layer sheet 22, an outer layer sheet 21, and a waist elastic member 24.
The waistline gather G1 formed from the composite stretchable part 4 is a region (mainly the upper waistline) mainly composed of the pressing sheet 27, the hydrophilic sheet 29, the inner layer sheet 22, the outer layer sheet 21, and the waistline elastic member 23. Part D1) and a region (mainly the lower waistline portion D2) in which the hydrophilic sheet 29 does not exist as compared with the region.
Thus, although the elastic member which comprises it differs with gathers, in the following description of the composite expansion-contraction part 4, the elastic member which comprises the composite expansion-contraction part 4 is demonstrated as the "composite expansion-contraction part formation elastic member 42".

  In the composite stretchable part 4, it is preferable that all the composite stretchable part forming elastic members 42 do not pass through all the joints 41. 42 may pass through some of the joints 41. Even if some composite stretchable part forming elastic member 42 passes through a part of the joints 41, the effect of the present invention is sufficiently achieved. Therefore, in the case where the composite stretchable part forming elastic member 42 does not pass through 70% (pieces / pieces) or more of the joined parts 41 provided in the composite stretchable part 4, the composite stretchable part forming elastic member It is assumed that 42 is configured not to pass through the joint portion 41.

As shown in FIGS. 10 and 11, the outer layer sheet 21 and the inner layer sheet 22 that are the composite stretchable part forming sheets facing each other in the stretch direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto, respectively. 2 are intermittently joined to each other by the joint portion 41. The joint portion 41 is preferably formed by heat sealing.
The plurality of composite stretchable part forming elastic members 42 are arranged in parallel to each other and extend along the longitudinal direction of the composite stretchable part 4. When a plurality of composite stretchable part forming elastic members 42 are arranged in parallel to each other as in this embodiment, the stretchable direction of the composite stretchable part 4 is the same direction as the direction in which the composite stretchable part forming elastic member 42 extends. It is. In the case where the plurality of composite stretchable part forming elastic members 42 are not arranged in parallel to each other, the stretchable direction of the composite stretchable part 4 extends over a plurality of composite stretchable part forming elastic members 42 (described later). In the direction perpendicular to the direction in which the ridges 43 extend.

  FIG. 11 is a diagram illustrating an arrangement pattern of the joint portions 41. The joint portions 41 are formed so as to form rows in the stretching direction (X direction) of the composite stretchable portion 4 and the direction (Y direction) perpendicular thereto, and the joint portions 41 constituting the row in the perpendicular direction are formed. It is formed between each of the composite stretchable part forming elastic members 42. In a natural state (a state where no external force is applied), the composite stretchable part forming elastic member 42 contracts, and each of the outer layer sheet 21 and the inner layer sheet 22 that are the composite stretchable part forming sheets facing each other is composed of a plurality of composites. A plurality of gathers 43 extending continuously over the stretchable part forming elastic member 42 are formed. In the present embodiment, a single collar 43 is formed between the joint portions 41, 41 adjacent to each other in the stretching direction (X direction) of the composite stretchable portion 4.

  From the viewpoint of reliably forming the flange 43 extending continuously over the plurality of composite stretchable part forming elastic members 42, when the composite stretchable part 4 extends, the joint part in the stretchable direction (X direction) of the composite stretchable part 4 The pitch P2 of 41 (see FIG. 11) is preferably 1 to 20 mm, particularly 3 to 10 mm, and the length L2 (see FIG. 11) of each joint 41 is 0.1 to 5 mm, particularly 0.2. It is preferable that it is -1.5mm. The ratio (P2 / L2) between the pitch P2 and the length L2 is preferably 1.1 to 200, particularly 2 to 50.

  In the composite stretchable part 4, the pitch P3 (see FIG. 11) of the joints 41 in the direction (Y direction) orthogonal to the stretch direction is preferably 1 to 40 mm, particularly 2 to 15 mm. The length L3 (see FIG. 11) is preferably 0.5 to 20 mm, particularly 1 to 10 mm. The ratio (P3 / L3) between the pitch P3 and the length L3 is preferably 1.05 to 80, particularly 1.05 to 15.

  In the composite stretchable part 4, the outer layer sheet 21 and the inner layer sheet 22 are preferably not joined to each other at a part other than the joint part 41. Each composite stretchable part forming elastic member 42 is arranged in the composite stretchable part 4 so as not to pass through the joint part 41 between the outer layer sheet 21 and the inner layer sheet 22, and excludes both ends of the composite stretchable part forming elastic member 42. The portion is not fixed to the outer layer sheet 21 and the inner layer sheet 22. That is, each composite stretchable part forming elastic member 42 is fixed to the outer layer sheet 21 and the inner layer sheet 22 only at both ends thereof.

The both ends of the composite stretchable part forming elastic member 42 are located between the outer layer sheet 21 and the inner layer sheet 22 in a state sandwiched between the outer layer sheet 21 and the inner layer sheet 22 at both ends 44 (only one shown) of the composite stretchable part 4. It is fixed to. Both end portions 44 of the composite stretchable portion 4 differ depending on the gathers formed thereby. In the first embodiment, both ends 44 of the composite stretchable part 4 forming the waist gather G2 are both side seal parts 11 and 11, and both ends 44 of the composite stretchable part 4 forming the waistline gather G1 are absorbed. These are the vicinity of the side edge of the main body 3 and the side seal part 11.
In addition, you may form the both ends 44 of the composite expansion-contraction part 4 so that expansion-contraction is possible.

  Each ridge 43 in the outer layer sheet 21 and the inner layer sheet 22 is formed so as to protrude from both surfaces of the composite stretchable portion 4, and a convex curved surface having an arcuate cross section is formed at the tip in the protruding direction of each ridge 43. Has been. The convex curved surface continuously extends in a direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4. In this embodiment, one ridge 43 is formed between the joint portions 41 and 41 adjacent to each other in the expansion / contraction direction (X direction) of the composite expansion / contraction part 4, and these ridges 43 are composed of the composite expansion / contraction part. It extends continuously in a direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4 without being divided at a portion overlapping the forming elastic member 42.

  In the composite stretchable part 4 in the present embodiment, each of a large number of ridges 43, 43 formed by contraction of the composite stretchable part forming elastic member 42 is continuous in a direction (Y direction) orthogonal to the stretchable direction of the composite stretchable part 4. Because it stretches, it looks very beautiful.

Moreover, the composite elastic part 4 in this embodiment can prevent the increase in rigidity, and the degree of freedom of deformation of the flange 43 with respect to external force is improved. The prevention of the increase in rigidity and the improvement in the degree of freedom of deformation of the flange 43 are such that the composite stretchable portion forming elastic member 42 has a trough between the flange 43 and the flange 43 in the outer layer sheet 21, and the flange 43 in the inner layer sheet 22. It exists in the state pinched | interposed between the trough part between the ridges 43, and is not joined to any of the outer layer sheet 21 and the inner layer sheet 22 including the part sandwiched between those trough parts. And the outer layer sheet 21 and the inner layer sheet 22 in the composite stretchable part 4 are continuously joined in any of the stretchable direction (X direction) of the composite stretchable part 4 and the direction (Y direction) perpendicular thereto. Is not based on that.
Furthermore, due to a synergistic effect with the tip of the collar 43 forming a convex curved surface, a volume appears in the thickness direction of the outer layer sheet 21 and the inner layer sheet 22 and the touch when touching the surface of the composite stretchable part 4 is felt. It is very soft and feels very good.

  Moreover, since the composite elastic part forming elastic member 42 in the composite elastic part 4 is present in a state where it is not joined to the outer layer sheet 21 and the inner layer sheet 22, the amount of hot melt adhesive used is suppressed to zero or a small amount. Can do. In particular, as in the present embodiment, when the outer layer sheet 21 and the inner layer sheet 22 are joined to each other by the joining portion 41 by heat fusion, the effect of reducing the amount of adhesive used is more remarkable. Since the amount of hot-melt adhesive used is small, air permeability and moisture permeability are not impaired.

The material for forming the composite stretchable part 4 in this embodiment will be described.
In the composite stretchable part 4, the outer layer sheet 21 and the inner layer sheet 22 are deformed by the shrinkage of the composite stretchable part forming elastic member 42 to form the flange 43. That is, the rigidity of the outer layer sheet 21 and the inner layer sheet 22 is one of the factors that determine the formability and cushioning properties of the collar 43 of the composite stretchable part 4. The rigidity of each sheet can be expressed by its buckling strength. The buckling strength of the sheet used for the composite stretchable part 4 is preferably 100 cN or less, particularly preferably 70 cN or less. Here, the buckling strength is measured by a compression test mode of a Tensilon universal testing device (manufactured by Orientec Co., Ltd.) as shown below.

Buckling strength test method (CD):
A rectangular test piece having a length of 150 mm in the machine flow direction (MD) and a length of 30 mm in the direction orthogonal to the machine flow direction (CD) is rounded to create a cylinder having a diameter of 45 mm. The lower end is stopped with a stapler or the like to obtain a measurement sample. This is measured by the compression test mode of the Tensilon universal testing device in a measurement environment of 20 ° C. and 65% RH under the measurement conditions of compression speed: 10 mm / min and measurement distance: 20 mm. The maximum strength when the measurement sample is compressed by 20 mm is measured for each measurement sample, the average value is obtained, and this is taken as the buckling strength.

As described above, non-woven cloth is preferably used as the outer layer sheet 21 and the inner layer sheet 22. The basis weight of the nonwoven fabric is preferably 5 to 50 g / m ² , particularly preferably 18 to 30 g / m ² . The buckling strength of the nonwoven fabric having such a basis weight is preferably 50 cN or less, particularly preferably 30 cN or less in the CD direction, and preferably 70 cN or less, particularly preferably 50 cN or less in the MD direction.

In addition, the outer layer sheet 21 and the inner layer sheet 22 are made of a heat-fusible resin from the viewpoint of facilitating joining by heat-sealing (formation of the joining portion 41). Is preferred. Examples of the heat-fusible resin include polyethylene and polypropylene. The fiber may be a core-sheath type composite fiber whose sheath is made of a heat-fusible resin.
The outer layer sheet 21 and the inner layer sheet 22 may be formed of the same material or different materials.

  As a material for forming the composite stretchable part forming elastic member 42 in the composite stretchable part 4, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As a form of the elastic member 42 for forming the composite stretchable part, the cross section is a rectangular shape, a square shape, a circular shape, a polygonal shape or the like (thread rubber or the like) or a string (flat rubber or the like), or a multifilament type thread or the like. Can be used.

Another factor that determines the formability of the flange 43 of the composite stretchable part 4 is the expansion ratio and tensile load of the composite stretchable part forming elastic member 42. In order to make the cross-sectional shape of the collar 43 convex, the required expansion ratio and tensile load of the composite stretchable part forming elastic member 42 are required. The expansion magnification here is obtained from the following equation, where A (mm) is the length when not stretched and B (mm) is the length when stretched.
Elongation magnification (%) = (B / A) × 100

  The composite stretchable part forming elastic member 42 is bonded to the facing composite stretchable part forming sheets (the outer layer sheet 21 and the inner layer sheet 22) in an elongated state of preferably 120 to 1100%, particularly preferably 150 to 500%. Then, the composite stretchable portion forming elastic member 42 contracts, and the contracted portion of the outer layer sheet 21 and the inner layer sheet 22 remain, and the remaining outer layer sheet 21 and inner layer sheet 22 are on the opposite side of the bonding surface of the joint portion 41. The flange 43 is formed by deforming in a direction (outside) into a convex shape in cross section.

  As described above, the height of the flange 43 is an important element related to the moldability and cushioning properties, such as the arrangement pattern and interval of the joint portions 41, and the facing composite stretchable portion forming sheets (the outer layer sheet 21 and the inner layer sheet 22). ), The composite stretchable part forming elastic member 42, etc., can be arbitrarily designed. The height of the flange 43 is preferably about 1 to 15 mm on one side. In order to increase the height of the ridge 43, the composite stretchable portion forming elastic member 42 is contracted to the extent that the interval between the adjacent joint portions 41 is narrowed to form the convex ridge 43. The stretchable part 4 can be formed. When forming the collar 43 having a height h on one side, the interval between the joint portions 41 needs to be at least 2 × h, and when the interval between the joint portions 41 is 2 × h, the composite stretchable portion The forming elastic member 42 needs to contract to such an extent that the adjacent joint portions 41 are adjacent to each other.

  One of the preferable elastic members for forming a composite stretchable part 42 is natural rubber (or synthetic rubber). Examples of natural rubber (synthetic rubber) include low modulus elastic members having a thickness of 0.05 to 1.5 mm and a width of 0.2 to 5 mm. In this elastic member, the load at the time of 200% elongation with a single yarn is preferably 1 to 70 gf, more preferably 1 to 40 gf, and particularly preferably 1 to 30 gf. By providing a plurality of single yarns of the elastic member having a low modulus at a high elongation ratio of preferably 200% or more, particularly preferably 300% or more, a composite stretchable part 4 having a beautiful heel 43 that stretches softly is obtained. Can do.

  Other preferred elastic members include polyurethane spandex elastic fibers. As the elastic fiber, one having a single yarn size of 10 to 3360 denier, particularly preferably 70 to 1120 denier is used. Denier is a unit representing the thickness of a yarn, and a yarn of 1 g at 9000 m is called 1 denier. It is preferable to use the spandex elastic fiber by stretching it to 130 to 600%.

According to the pants-type disposable diaper of 1st Embodiment which has the above structure, the transpiration | evaporation property of the sweat in the waist flap F, breathability, softness, urine leak prevention property etc. are excellent, for example.
Specifically, the sweat absorbed by the pressing sheet 27 which is the non-skin contact surface forming sheet of the waist flap F moves to the hydrophilic sheet 29 on the inner side and diffuses. And since the space is formed in the heel 43 in the composite stretchable part 4, the sweat that has migrated to the hydrophilic sheet 29 evaporates quickly. Therefore, sweat transpiration in the waist flap F is excellent.
In addition, although the pressing sheet 27 which is a skin contact surface forming sheet made of a hydrophobic sheet is not highly absorbent, the skin contact surface forming sheet in the waist flap F is worn by the tightening force by the waist gather G2. Is pressed by the hydrophilic sheet 29. Therefore, the sweat adhering to the skin contact surface side of the waist flap F moves to the hydrophilic sheet 29.

  Further, if the non-skin contact surface forming sheet and the skin contact surface forming sheet are formed of a hydrophilic sheet, the skin contact surface of the waist flap F and the sweat absorbed by the hydrophilic sheet and When the non-skin contact surface becomes sticky, the skin contact surface and the non-skin contact surface of the waist flap F are formed from the pressing sheet 27 and the outer layer sheet 21 made of a hydrophobic sheet, respectively. It is easy to obtain a dry feeling without stickiness.

  Moreover, quick-drying improves because the heel 43 of the composite elastic part 4 moves at the time of perspiration. Specifically, when sweating, the heel 43 that contacts the wetted portion of the skin is stretched and then hardly returned due to friction, and therefore moves to a portion where the skin is not wetted. And since a diaper (especially waist part F) closely_contact | adheres to the wet part of skin, sweat can be efficiently absorbed in the composite expansion-contraction part 4. FIG. As a result, the sweat absorbed in the composite stretchable part 4 diffuses and transpires in the hydrophilic sheet 29, and thus has a high quick drying property.

  Since the waist gather G1 and the waist gather G2 are formed from the composite stretchable part 4, and the stretchability of the gather can be expressed without substantially using a hot melt adhesive, the ventral side A and back The air permeability in the side part B is excellent. Moreover, the raw material original texture of the outer-layer sheet 21 and the inner-layer sheet 22 of the outer packaging material 2 can be utilized, and it is soft and not stiff.

  In the first embodiment, the waist flap F includes four sheets (a pressing sheet 27, a hydrophilic sheet 29, an inner layer sheet 22, and an outer layer sheet 21), which are described later in second to fourth embodiments. As described above, the sheet has one sheet more than the waist flap F having three sheets (pressing sheet 27, hydrophilic sheet 29 (or hydrophilic inner layer sheet 22) and outer layer sheet 21). , Breathability and softness tend to be low. Therefore, it is preferable to join the hydrophilic sheet 29 and the inner layer sheet 22 (and the outer layer sheet 21) by the joint portion 41 of the composite stretchable portion 4. In this way, by joining the hydrophilic sheet 29 and the inner layer sheet 22 without using the hot melt adhesive, the air permeability and softness of the waist flap F can be increased without increasing the amount of use of the hot melt adhesive. A decrease in thickness can be prevented.

  A back sheet 33 is provided on the back side of the absorbent main body 3, and the hydrophilic sheet 29 is located on the back side of the absorbent main body 3, so that urine absorbed in the absorbent main body 3 is absorbed in the hydrophilic sheet 29. Never touch.

  In the composite stretchable part 4, the contractile force of the composite stretchable part forming elastic member 42 is not inhibited at all (or almost), so the contractive force is utilized to the maximum extent. For example, when the expansion and contraction characteristics are graphed by taking the circumference of the waistline D on the horizontal axis and the tensile load of the waistline D on the vertical axis, it can be seen that the slope of the characteristic curve is gentle, that is, the stretchability is high. In addition, the load difference between the characteristic curve at the time of expansion and the characteristic curve at the time of contraction is small, i.e., the load fluctuation with respect to the fluctuation of the circumference is small, and an equivalent wearing pressure can be obtained for both small and large infants It can be seen that problems such as diaper slippage for relatively small children and rubber marks on relatively large children are eliminated, and the size application range of the wearer is increased.

Therefore, since the shrinkage force is high, it fits gently to the wearer and is difficult to slip off. Moreover, since the whole diaper shrinks to the maximum extent, there is an advantage that it looks compact. Moreover, since the usage-amount of the composite elastic part formation elastic member 42 can be reduced, it is advantageous also in terms of cost.
Since the collar 43 is formed on the outer surface of the composite stretchable part 4 and the collar 43 is a contact surface with the wearer, the composite stretchable part 4 is less sticky when worn, has high cushioning properties, and fits gently. Less damage to the wearer's skin. Moreover, since the collar 43 is also arranged on the outer surface of the outer packaging material 2 (the outer surface when worn), the outer surface feels excellent.

  Next, one manufacturing method for continuously producing the pants-type disposable diaper of the first embodiment will be described with reference to the drawings. FIG. 12 is a perspective view showing the entire manufacturing method. FIG. 13: is a conceptual diagram which mainly shows the process of forming a composite expansion-contraction part, a non-functionalization area | region, and a leg elastic member cutting area | region among this manufacturing methods. FIG. 14 is a conceptual diagram showing mainly the process of forming the composite stretchable part in the present manufacturing method.

  In this manufacturing method, as shown in FIGS. 12 to 14, the outer layer sheet 21 and the inner layer sheet 22 are joined by the joining part 41 to form the composite stretchable part 4, and the contraction force of the elastic members 23 and 26 is applied. The same roll 62 is used for the step of forming the non-functionalized region 51 without making it appear.

  In this manufacturing method, as shown in FIG. 12, (1) a continuous body 21S of the outer layer sheet 21 and a continuous body 22S of the inner layer sheet 22 are interposed between the continuous bodies 23S of the elastic members 23, 24, 25, 26. 24S, 25S, and 26S are sandwiched and joined to form a continuous body 2S of the outer packaging material 2. (2) Next, a continuous body 29S of the hydrophilic sheet 29 is placed on the inner layer sheet continuous body 22S side of the outer packaging material continuous body 2S. The hydrophilic sheet-bonded continuous body 2S ′ is formed by bonding, and (3) the absorbent main body 3 is then placed on the inner-layer sheet continuous body 22S side of the hydrophilic sheet-bonded continuous body 2S ′ (see FIG. 4). ), And then, the diaper continuous body 1S is formed as the continuous body 27S of the pressing sheet 27 by folding both side portions of the outer layer continuous sheet body 21S toward the absorbent main body 3 side. (4) After that, the diaper Continuum 1S Cutting to a method for producing a pants-type disposable diaper to form individual diapers 1.

  This manufacturing method will be described in detail. The outer layer sheet continuous body 21 </ b> S is used as the original sheet of the outer layer sheet 21, the inner layer sheet continuous body 22 </ b> S is used as the original sheet of the inner layer sheet 22, and the hydrophilic sheet continuous body 29 </ b> S is used as the original sheet of the hydrophilic sheet 29. The hydrophilic sheet continuum 29S is used in two strips corresponding to the back and ventral waist flaps F, respectively. Both side portions of the outer layer sheet continuous body 21S are folded back to the inner layer sheet continuous body 22S side to form a pressing sheet continuous body 27S (details will be described later).

  Each continuous body 23S, 24S, 25S, 26S of each elastic member 23, 24, 25, 26 is introduced between the outer layer sheet continuous body 21S and the inner layer sheet continuous body 22S in an expanded state. In addition, in FIG. 13, illustration of the continuous body 26S of the front crotch elastic member 26 is abbreviate | omitted. Before the outer layer sheet continuous body 21S and the inner layer sheet continuous body 22S merge, a hot melt adhesive is applied to a predetermined position on the respective facing surfaces by an adhesive application device 64 (see FIG. 13) or the like. It is crafted. Further, the continuum 25S of the leg elastic member 25 is swung along the shape of the leg opening 13 by the swing guide 65 (see FIG. 13), while the outer layer sheet continuum 21S and the inner layer sheet continuum 22S. Introduced between.

Both sheet continuums 21S and 22S are compressed between the pair of nip rolls 61 and 61 with the elastic member continuums 23S, 24S, 25S, and 26S sandwiched therebetween. As a result, an outer packaging material continuum 2S is obtained in which the elastic member continuums 23S, 24S, 25S, and 26S are sandwiched and joined between the sheet continuums 21S and 22S. Here, the waistline elastic member 23 is not joined by the hot-melt adhesive in the region between the side edge portion of the absorbent main body 3 and the side seal portion 11. Similarly, the waist elastic member 24 is not joined by a hot melt adhesive in a region between the pair of side seal portions 11.
At this time, the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are not formed in the outer packaging material continuous body 2S.

Next, the outer wrapping material continuous body 2 </ b> S in which the composite stretchable part 4 or the like is not formed is introduced between the composite stretchable part forming roll 62 and the anvil roll 63. The composite stretchable part forming roll 62 includes a composite stretchable part forming part 62A that forms the composite stretchable part 4 on its peripheral surface, and a non-functionalized region forming part 62B that forms the nonfunctionalized region 51 and leg elastic member cutting. A leg elastic member cutting region forming part 62 </ b> C that forms the region 52 is provided.
The anvil roll 63 is a receiving roll for the composite stretchable part forming roll 62, and its peripheral surface is a smooth surface.

  A plurality of embossed pins 62D (see FIG. 14) are provided in the composite stretchable part forming part 62A of the composite stretchable part forming roll 62 in correspondence with the joint part 41 of the composite stretchable part 4, and the composite stretchable part forming part 62A. According to the above, the joint portion 41 can be formed in a region corresponding to the composite stretchable portion 4 in the outer packaging material continuous body 2S in which the composite stretchable portion 4 is not formed. The emboss spin 62D may be a heat emboss spin or an ultrasonic emboss spin. FIG. 14 is a conceptual diagram showing only elements closely related to the process of forming the composite stretchable part 4. Therefore, for example, only the composite stretchable part forming part 62A is illustrated on the peripheral surface of the composite stretchable part forming roll 62, and only the composite stretchable part 4 is illustrated for the outer packaging material continuous body 2S.

  The non-functionalized region forming part 62B of the composite stretchable part forming roll 62 is a part that prevents the contractive force of the elastic member from being expressed, and can form the non-functionalized region 51 in the outer packaging material continuous body 2S. The non-functionalized region forming part 62B is composed of a large number of convex portions and cutter blades that divide the elastic member, and a large number of emboss pins that harden the elastic member by heat sealing.

  The leg elastic member cutting region forming part 62C of the composite stretchable part forming roll 62 is a part for cutting the leg elastic member continuous body 25S existing at the position of the crotch part C in the center in the width direction. Can be formed. The leg elastic member cutting region forming part 62C is composed of, for example, a large number of convex parts and cutter blades. According to the leg elastic member cutting region forming portion 62C, the leg elastic members 25, 25 separated in the width direction at the center in the width direction of the crotch C can be obtained by cutting the leg elastic member continuous body 25S.

  Between the composite stretchable part forming roll 62 having the above configuration and the anvil roll 63, the outer envelope material continuous body 2S in which the composite stretchable part 4, the non-functionalized area 51, and the leg elastic member cutting area 52 are not formed is inserted. By doing so, the outer packaging material continuous body 2S in which the composite stretchable part 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are formed in a predetermined region is obtained.

  Next, the outer packaging material continuum 2S on which the composite stretchable part 4 is formed, and the hydrophilic sheet continuum 29S coated with the hot-melt adhesive Q (see FIG. 15) are combined with the inner layer sheet continuum 22S. The hot melt adhesive Q is faced to be narrowed between the pair of nip rolls 66, and as a result, a hydrophilic sheet bonded continuous body 2S ′ is obtained. The hydrophilic sheet continuous body 29S and the outer packaging material continuous body 2S can be joined by heat sealing.

The pants-type disposable diaper 1 of the above embodiment uses the hydrophilic sheet-bonded continuous body 2S ′ in which the composite stretchable portion 4, the non-functionalized region 51, and the leg elastic member cutting region 52 are formed, and the subsequent steps. It can manufacture by performing similarly to each process in the manufacturing method of the conventional what is called a cross-flow type underpants type disposable diaper.
For example, as shown in FIG. 12, after the absorbent main body 3 obtained by cutting the absorbent main body continuous body 3S on the hydrophilic sheet-bonded continuous body 2S ′ is rotated 90 degrees with respect to the flow direction, respectively. The main body joint 15 (see FIG. 4) is intermittently joined and fixed. The absorptive main body 3 is fixed to the hydrophilic sheet-bonded continuous body 2S ′ while maintaining the stretched state of the hydrophilic sheet-bonded continuous body 2S ′. In other words, the absorbent main body 3 is fixed while maintaining the hydrophilic sheet-bonded continuous body 2S ′ so as not to be contracted by the contraction force of the composite stretchable part 4 or the like.

  Next, as shown in FIGS. 12 and 15, both side portions (pressing sheet continuous body 27 </ b> S) of the outer layer continuous sheet body 21 </ b> S are folded back so as to cover both end parts of the absorbent main body 3. After the pressing sheet continuous body 27 </ b> S is fixed to both ends, the hydrophilic sheet bonded continuous body 2 </ b> S ′ is folded in two with the absorbent main body 3. The adhesive Q is applied in advance to predetermined positions (see FIG. 15) such as the inner surface side of the pressing sheet continuous body 27S, the inner layer continuous sheet 22S facing the pressing sheet continuous body 27S, and the absorbent main body 3.

Moreover, as shown in FIG.12 and FIG.13, the trim 13S for leg opening part formation is removed from the outer packaging material continuous body 2S with a rotary cutter, a laser cutter, etc., and the diaper continuous body 1S is obtained.
Then, the diaper continuous body 1S is folded back in the width direction (longitudinal direction of the disposable diaper 1) and folded in two. Next, after forming the side seal portions 11 and 11 by heat sealing, ultrasonic sealing, high frequency sealing or the like, or simultaneously with the formation of the side seal portions 11 and 11, the side seal portions 11 and 11 are divided into individual diapers. A pants-type disposable diaper 1 can be obtained.

  In the obtained pants-type disposable diaper 1, as shown in FIG. 16, if the composite stretchable part forming elastic member 42 (the waistline elastic member 23, the waist elastic member 24) is contracted, the pressing sheet 27, the hydrophilic sheet 29, a plurality of ridges 43 are formed on each of the inner layer sheet 22 and the outer layer sheet 21, whereby a composite stretchable part that forms a waist gather G2 and a waistline gather G1 in a predetermined region of the waist flap F and the waistline part D 4 is formed.

  As a method of intermittently fixing the absorbent main body 3 by 90 degrees and intermittently fixing it onto the hydrophilic sheet-bonded continuous body 2S ′, for example, a method described in JP-A-4-166150 can be used. Further, the main body bonding portion 15 (see FIG. 4) for fixing the absorbent main body 3 to the hydrophilic sheet bonded continuous body 2S ′ is applied to one or both of the absorbent main body 3 and the hydrophilic sheet bonded continuous body 2S ′. It can be worked. Further, the trim 13S for forming the leg opening can be removed before the absorbent main body 3 is fixed to the hydrophilic sheet-bonded continuous body 2S ′.

  According to this manufacturing method, the outer layer sheet 21 and the inner layer sheet 22 are joined by the joining part 41 to form the composite stretchable part 4, and the contraction force of the elastic members 23 and 26 is not expressed and the non-functionalized region Since the process of forming 51 is performed using the same roll 62, the underpants type disposable diaper provided with the composite expansion-contraction part 4 and the non-functionalization area | region 51 can be produced efficiently.

  In the manufacturing method shown in FIG. 13, after forming the composite stretchable part 4, the hydrophilic sheet continuous body 29 </ b> S is joined to the outer packaging material continuous body 2 </ b> S to form the hydrophilic sheet joined continuous body 2 </ b> S ′. The joining position of both continuous bodies is not limited to this, and as shown in FIG. 17, before forming the composite stretchable portion 4, the hydrophilic sheet continuous body 29S is joined to the outer packaging material continuous body 2S, and the hydrophilic sheet A joined continuum 2S ′ can be formed. In that case, the hot melt adhesive is omitted for bonding the hydrophilic sheet continuous body 29S and the inner layer continuous sheet 22S, and the hydrophilic sheet continuous is formed by the bonding section 41 when the composite stretchable part 4 is formed. Three of the body 29S, the inner layer continuous sheet 22S, and the outer layer continuous sheet 21S can be joined simultaneously. According to such a joining method, there is an advantage that the amount of hot melt adhesive used can be reduced.

  Next, other embodiment of the absorbent article of this invention is described. In the other embodiments, differences from the first embodiment described above will be mainly described, and the same points are denoted by the same reference numerals and description thereof will be omitted. For the points that are not particularly described, the description of the first embodiment is applied as appropriate. In other embodiments, the same effects as those of the first embodiment can be obtained.

As shown in FIG. 18, the pants-type disposable diaper as the second embodiment of the present invention is different in the arrangement position of the hydrophilic sheet 29 compared to the first embodiment.
Specifically, in 2nd Embodiment, as shown in FIG. 18, the hydrophilic sheet | seat 29 is the skin contact surface side of the longitudinal direction edge part of the absorptive main body 3, ie, a skin contact surface formation sheet. Between the pressing sheet 27 and the skin contact surface side of the end of the absorbent main body 3 in the longitudinal direction. The size, shape, placement position, etc. of the hydrophilic sheet 29 in the plan view are the same as the size, shape, placement position, etc., of the hydrophilic sheet 29 in the first embodiment, respectively.

The hydrophilic sheet 29 and the pressing sheet 27 can be bonded by a hot melt adhesive, or can be bonded by heat sealing or ultrasonic bonding to reduce the amount of hot melt adhesive used. . The hydrophilic sheet 29, the absorptive main body 3 and the inner layer sheet 22 can be joined by, for example, a hot melt adhesive.
Other configurations are the same as those in the first embodiment.

  In the vicinity of the end in the longitudinal direction of the pants-type disposable diaper according to the second embodiment, for example, as shown in FIG. 19, a hydrophilic sheet 29 is placed on the inner surface side of the pressing sheet 27 before being folded back. Next, hot melt adhesive Q or the like is applied to the surface of the hydrophilic sheet 29 facing the absorbent main body 3, and then the pressing sheet 27 is absorbed together with the hydrophilic sheet 29. It can be formed by folding back to the skin contact surface side of the main body 3.

According to the pants-type disposable diaper of the second embodiment, the same effects as the first embodiment are exhibited, and the following effects are also achieved due to the difference in the arrangement position of the hydrophilic sheet 29.
Since the hydrophilic sheet 29 covers the skin contact surface side of the longitudinal end of the absorbent main body 3, the area capable of absorbing sweat is wide. Therefore, the sweat absorbed in the portion where the absorbent main body 3 is present diffuses through the hydrophilic sheet 29 and easily moves to the waist flap F. Therefore, the sweat evaporates from the waist flap F, and the sweat as the entire absorbent article Improves the transpiration of
In addition, in 2nd Embodiment, the hydrophilic sheet | seat 29 can also be arrange | positioned so that the absorptive main body 3 may not be covered (it arrange | positions only to a waist flap F) (not shown), such a form In this case, the sweat absorbed in the absorbent main body 3 is mainly held by the absorbent core 34.

  Moreover, in the pants-type disposable diaper of the second embodiment, the urine absorbed by the absorbent main body 3 diffuses through the hydrophilic sheet 29 that covers the skin contact surface side of the longitudinal end portion of the absorbent main body 3, Compared with the first embodiment, the possibility of oozing from the waist flap F is high, but urine hardly actually reaches the end in the longitudinal direction of the absorbent main body 3, and the hydrophilic sheet 29. However, since it is covered with the pressing sheet 27 and the outer layer sheet 21 made of a hydrophobic sheet, there is little possibility that urine actually oozes from the skin contact surface side and the non-skin contact surface side of the waist flap F.

  As described above, since the hydrophilic sheet 29 can be bonded to the inner surface side of the pressing sheet 27 by ultrasonic bonding, the amount of hot melt adhesive used can be reduced, and the breathability and softness of the waist flap F can be reduced. Can be improved. Further, the bleeding of the hot melt adhesive from the skin contact surface side of the waist flap F can be reduced.

Next, a third embodiment will be described. In the pants-type disposable diaper of the third embodiment, as shown in FIG. 20, the inner layer sheet 22 does not exist in the vicinity of the end portions in the longitudinal direction of the waist flap F and the absorbent main body 3 as compared with the first embodiment. The point is mainly different.
Specifically, as compared with the first embodiment, the size and shape of the hydrophilic sheet 29, the arrangement position in plan view, and the like are the size and shape of the hydrophilic sheet 29 in the first embodiment, respectively. The inner layer sheet 22 is not substantially present in the vicinity of the end portions in the longitudinal direction of the waist flap F and the absorbent main body 3, although it is the same as the arrangement position in a plan view. The inner end portion (in the longitudinal direction of the absorbent article) of the hydrophilic sheet 29 and the outer end portion (in the longitudinal direction of the absorbent article) of the inner layer sheet 22 are slightly overlapped and joined at overlapping portions.

Therefore, the inner flap 22 does not exist in the waist flap F, and the sheets forming the waist flap F are the three sheets of the pressing sheet 27, the hydrophilic sheet 29, and the outer layer sheet 21. Further, unlike the first and second embodiments, the composite stretchable part forming sheet is composed of the hydrophilic sheet 29 and the outer layer sheet 21 which is a non-skin contact surface forming sheet.
Other configurations are the same as those in the first embodiment.
In the third embodiment, the inner layer sheet 22 may be omitted from the crotch portion C (that is, the crotch portion C has a single-layer structure of the outer layer sheet 21) (not shown).

According to the pants-type disposable diaper of the third embodiment, the same effects as the first embodiment are exhibited, and the following effects are also achieved.
In the third embodiment, as compared with the first embodiment, the inner layer sheet 22 (usually made of a hydrophobic sheet) is not disposed between the hydrophilic sheet 29 and the outer layer sheet 21, and therefore, Moreover, since there is no hot melt adhesive that joins the hydrophilic sheet 29 and the inner layer sheet 22, the transpiration of sweat in the waist flap F is improved.
Moreover, since the number of sheets in the waist flap F is small (one less than that in the first embodiment), and the amount of hot melt adhesive used can be reduced accordingly, the air permeability and softness in the waist flap F can be reduced. Will improve.

  Next, a fourth embodiment will be described. The pants-type disposable diaper of the fourth embodiment is mainly different from the first embodiment in that the inner layer sheet itself is formed of a hydrophilic sheet 29 as shown in FIG. Therefore, unlike the first to third embodiments, the inner layer sheet 22 that is separate from the hydrophilic sheet 29 is not provided. The composite stretchable part forming sheet is composed of a hydrophilic sheet 29 that is an inner layer sheet and an outer layer sheet 21 that is a non-skin contact surface forming sheet.

According to the pants-type disposable diaper of 4th Embodiment, the effect similar to 3rd Embodiment is show | played.
In the fourth embodiment, the urine leakage preventing property at the waistline portion D is sufficient, but a slight urine leakage may occur at the crotch portion C. However, since urine leakage at the crotch part C can be substantially prevented by the three-dimensional side cuffs 35 in the absorbent main body 3, the urine hardly comes into contact with the hydrophilic sheet 29 that is the inner layer sheet.

  Further, in the fourth embodiment, the inner layer sheet 22 is formed from a hydrophobic material, and only the regions that become the waist flap F and the waistline portion D (regions that become the back side portion B and the ventral side portion A) are hydrophilized. The above-mentioned problem (urine leakage at the crotch C) in the fourth embodiment can be improved by treating the hydrophilic sheet and not hydrophilizing the other regions (regions that become the crotch C). .

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
In the first to fourth embodiments, the outer layer sheet 21 and the pressing sheet 27 are integrally configured. However, in the present invention, the outer layer sheet 21 and the pressing sheet 27 may be configured separately. It is preferable that the longitudinal end portion of 21 coincides with the outer end portion (in the longitudinal direction of the absorbent article) of the separate pressing sheet 27. Even in the case where a separate pressing sheet is used, the portions that overlap the both ends in the longitudinal direction of the absorbent main body 3 are bonded via an adhesive over substantially the entire width of the absorbent main body 3, thereby absorbing the absorbent body. It is preferable that both longitudinal ends of the main body 3 are fixed to the outer packaging material 2.

The outer layer sheet 21 and the inner layer sheet 22 are not limited to two separate sheets, but one sheet is folded to form two opposing surfaces, and the portion constituting one surface is the outer layer sheet 21. The part constituting the other surface can also be used as the inner layer sheet 22.
The outer packaging material 2 is formed of a laminated body of an outer layer sheet 21 having the same shape as the outer packaging material 2 and a separated inner layer sheet 22 that exists only in the abdominal side A and the back side B and does not exist in the crotch C. May be. In the outer packaging material 2 having this configuration, the crotch portion C is formed only from the outer layer sheet 21.
The outer layer sheet 21 is composed of a sheet that forms the ventral side A, a sheet that forms the crotch C, and a sheet that forms the back side B, which are separate sheets, and these sheets are arranged in the longitudinal direction of the outer layer sheet 21. It can also be formed by connecting. The same applies to the inner layer sheet 22.

The composite stretchable portion 4 can change the arrangement of the joint portions 41 with respect to the composite stretchable portion 4 shown in FIGS. 10 and 11. For example, the joint portions 41 may be arranged in a staggered manner as shown in FIG. That is, an array pattern in which the positions of the joint portions 41 are shifted by a half pitch (P1 / 2) between the row in the stretch direction (X direction) of the composite stretchable portion 4 and the row adjacent thereto.
More specifically, the joint portion 41 is formed so as to form a line (form a seal line) in the expansion / contraction direction (X direction) of the composite expansion / contraction portion 4 and the direction orthogonal to the expansion direction (Y direction). One joining portion 41 forming a row in the direction (Y direction) is formed for every two elastic members.
Between the column in the expansion / contraction direction (X direction) of the composite stretchable portion 4 and the row adjacent thereto, a region where the joint portion 41 does not exist is continuously formed between both end portions 44 of the composite stretchable portion 4. In this region, the composite stretchable part forming elastic member 42 is arranged in a non-joined state. As a result, two ridges 43 are formed between the joint portions 41 and 41 adjacent to each other in the stretching direction (X direction) of the composite stretchable portion 4.

  From the viewpoint of reliably forming the flange 43 continuously extending over the plurality of composite stretchable part forming elastic members 42, in the state where the composite stretchable part 4 is extended (the state shown in FIG. 22), The pitch P1 (see FIG. 22) of the joint portions 41 in the expansion / contraction direction (X direction) is preferably 1 to 30 mm, particularly 6 to 20 mm, and the length L1 (see FIG. 22) of each joint portion 41 is 0.1 to 5 mm, particularly preferably 0.2 to 1.5 mm. The ratio (P1 / L1) between the pitch P1 and the length L1 is preferably 1.1 to 300, particularly 4 to 100.

  The composite stretchable part 4 is not limited to the configuration of the composite stretchable part 4 shown in FIGS. 10 and 11 and the composite stretchable part 4 shown in FIG. For example, as shown in FIG. 23 and FIG. 24, the composite stretchable part 4 is configured such that the facing composite stretchable part forming sheets 21 and 22 are intermittent in the stretchable direction (X direction) of the composite stretchable part 4 and perpendicular to it ( In the Y direction), a plurality of ridges 43 that are joined to each other by the continuous joining portion 41 and that face each other and each of the facing composite stretchable portion forming sheets 21 and 22 continuously extend over a plurality of composite stretchable portion forming elastic members 42. It can comprise by forming.

The above description of the joint 41 that is intermittent in the direction (Y direction) orthogonal to the stretch direction of the composite stretchable part 4 (pitch of the joint 41 in the stretch direction (X direction) of the composite stretchable part 4) is continuous. This is also applied to the appropriate joint 41.
In the composite stretchable part 4 provided with the continuous joint part 41, the composite stretchable part forming elastic member 42 is joined to the composite stretchable part forming sheets 21 and 22 by the joint part 41. Compared to the composite stretchable part 4 provided with intermittent joints 41 in the direction perpendicular to the direction (Y direction), the collars 43 can be easily formed even if the pitch and length of the joints 41 are not set strictly. There is an advantage of being.

  The composite stretchable part 4 can also be applied to gathers other than the waistline gather G1 and the waist gather G2. The composite stretchable part 4 that forms the waistline gather G1 may be provided only in a region outward in the width direction from the absorbent main body 3. In the waistline portion D, the waistline gather G1 formed from the composite stretchable portion 4 may not be provided.

  In the first to fourth embodiments, a skin contact surface forming sheet made of a hydrophobic sheet, a non-skin contact surface made of a hydrophilic sheet and a hydrophobic sheet are formed on both the dorsal and ventral waist flaps F. Although the seat is provided and the waist gathers G2 formed from the composite stretchable part 4 are provided, such a configuration may be configured only on the back side waist flap F.

The absorbent article of this invention can be made into the form which is not provided with the outer packaging material 2 joined to the non-skin contact surface side of the absorptive main body 3. FIG. For example, the front sheet and the back sheet respectively covering the front and back sides of the absorbent core are extended outward in the longitudinal direction of the absorbent core, and a waist flap is formed from the extended top sheet and back sheet can do.
Although the said embodiment is a pants type disposable diaper, this invention is not restrict | limited to this and can be applied to a deployment type disposable diaper. Further, the present invention is not limited to disposable diapers, and can be applied to a pants-type (shorts-type) sanitary napkin or the like.

  The flanges 43 in the composite stretchable part 4 are continuous between the two composite stretchable part forming elastic members 42 located at both ends in the direction (Y direction) orthogonal to the stretchable direction of the composite stretchable part 4. The composite stretchable part forming elastic member 42 located near the end of the stretchable part 4 in the Y direction may be present in a state of being joined to the outer layer sheet 21 and the inner layer sheet 22. However, it is preferable that the heel 43 is continuous over at least three, preferably half, particularly preferably 70% or more of the total number of the composite stretchable part forming elastic members 42. Further, the end of the composite stretchable part forming elastic member 42 joined to both sheets 21 and 22 may be present inside the end 44 in the stretchable direction (X direction) of the composite stretchable part 4.

The number of the composite stretchable part forming elastic members 42 in the composite stretchable part 4 can be appropriately determined according to the size and use of the composite stretchable part 4, and can be, for example, 5 to 30. Further, the joining portion 41 can be formed by joining with an adhesive such as ultrasonic joining or hot-melt adhesive other than heat fusion.
Further, the arrangement pattern of the intermittent joint portions 41 in the direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction portion 4 can be appropriately changed. The shape of the joint part 41 intermittent in the direction (Y direction) orthogonal to the expansion / contraction direction of the composite expansion / contraction part 4 can be an appropriate shape such as a rectangular shape, an oval shape, a circular shape, or a rhombus shape.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
“Example 1” was created as an example corresponding to the first embodiment. Specifically, as the outer layer sheet 21 and the pressing sheet 27, a hydrophobic air-through nonwoven fabric (basis weight 20 g / m ² ) made of a core-sheath type composite fiber having a core PET / sheath PE is used as the inner layer sheet 22. A hydrophobic spunbonded nonwoven fabric (basis weight: 16 g / m ² ) composed of a core-sheath type composite fiber having a PET core and a PE sheath was used. A non-woven fabric (basis weight 10 g / m ² ) obtained by hydrophilizing a SMMS non-woven fabric composed of PP fibers was used as the hydrophilic sheet 29 that is separate from the inner layer sheet 22.

  In Example 1, the outer layer sheet 21 and the inner layer sheet 22 are joined to each other by an intermittent joining portion 41 in the stretching direction of the composite stretchable portion 4 and the direction orthogonal thereto. The hydrophilic sheet 29 is disposed in a region corresponding to the upper waistline portion D1 and the waist portion F on the absorbent main body 3 side of the inner layer sheet 22. The hydrophilic sheet 29 and the inner layer sheet 22 are entirely bonded by a hot melt adhesive. The hydrophilic sheet 29 and the pressing sheet 27 are joined together by a hot melt adhesive.

[Example 2]
“Example 2” was created as an example corresponding to the fourth embodiment. Specifically, the same nonwoven fabric as the outer layer sheet 21 in Example 1 was used as the outer layer sheet 21 and the pressing sheet 27. On the other hand, unlike Example 1, the hydrophilic sheet 29 separate from the inner layer sheet 22 is not provided. That is, the entire inner layer sheet 22 is a hydrophilic sheet 29, and the same nonwoven fabric as the hydrophilic sheet 29 in Example 1 was used as the hydrophilic sheet 29. The rest is the same as in the first embodiment.

Example 3
“Example 3” was created as an example in which a part of Example 1 was changed. In Example 3, as compared with Example 1, a spunlace nonwoven fabric (basis weight 40 g / m ² ) made of rayon (70 wt%) and PET (30 wt%) was used as the hydrophilic sheet 29. The rest is the same as in the first embodiment.

[Comparative Example 1]
"Comparative example 1" was created as an example in which part of Example 2 was varied. In Comparative Example 1, as compared with Example 2, the same non-woven fabric as the inner layer sheet 22 in Example 1, which is a hydrophobic sheet, was used as the inner layer sheet 22. The rest is the same as in the second embodiment.
Comparative Example 1 is a comparative example of the present invention in that the facing composite stretchable part forming sheet is formed from the facing hydrophobic sheets (outer layer sheet 21, inner layer sheet 22) (in the examples of the present invention). Absent).

[Comparative Example 2]
"Comparative example 2" was created as an example in which part of Example 2 was varied. In Comparative Example 2, as compared with Example 2, the outer layer sheet 21 and the inner layer sheet 22 are entirely bonded. The rest is the same as in the second embodiment. Comparative Example 2 is a comparative example of the present invention in that the composite stretchable part 4 is not formed on the outer layer sheet 21 and the inner layer sheet 22 and the outer layer sheet 21 and the inner layer sheet 22 are entirely bonded. (Not an embodiment of the invention).

[Comparative Example 3]
“Comparative Example 3” was created as an example in which a part of Comparative Example 2 was changed. The comparative example 3 uses the same nonwoven fabric as the inner layer sheet 22 in the comparative example 1 as the inner layer sheet 22 as compared with the comparative example 2. Other than that is the same as Comparative Example 2. In Comparative Example 3, the composite stretchable portion 4 is not formed on the outer layer sheet 21 and the inner layer sheet 22, the outer layer sheet 21 and the inner layer sheet 22 are entirely joined, and no hydrophilic sheet is provided. This is a comparative example of the present invention (not an example of the present invention).

  For each of the above Examples and Comparative Examples, the above [Method for measuring liquid diffusion area], [Method for measuring liquid holding amount], [Method for measuring drying time (single injection)] and [Method for measuring drying time (repeated) Measurement method of “injection”] “Liquid diffusibility”, “liquid retention”, “quick drying (single injection)” and “quick drying (repetitive injection)” were evaluated according to each. The [Method for measuring liquid diffusion area] and [Method for measuring liquid holding amount] were measured with a hydrophilic sheet alone.

[Measurement method of drying time (single injection)]
The waist part F of the diaper was used as a sample. On the hot plate, the sample is set in an extended state and the pressing sheet 27 is set to face the hot plate. Next, using a syringe, water (0.1 mL) is injected between the sample pressing sheet 27 and the hot plate, and the sample is pressurized (about 1.0 kPa, about 5 sec). And time (drying time) until a sample dries is measured. As the hot plate, a BT plate (area: 10 × 10 cm ² , temperature: 33 ° C.) manufactured by Kato Tech Co., Ltd .: KES-F7 (Thermo Lab II) is used. The measurement environment is 23 ° C., 50% RH, and wind speed 1.0 m / sec.
The drying time is determined from the heat dissipation amount of the BT plate. That is, after injecting water into the sample, the amount of heat release increases, and when all the water evaporates and the sample dries, the amount of heat release decreases to the value before water injection. Therefore, the time from the injection of water into the sample until the amount of heat released before the injection of water is defined as “drying time (single injection)”.

[Measurement method of drying time (repeated injection)]
Similarly to the above [Drying time (single injection) measurement method], the sample is set on the hot plate in a stretched state and the pressing sheet 27 is opposed to the hot plate. Next, using a syringe, water (0.1 mL) is injected between the sample pressing sheet 27 and the hot plate to pressurize the sample (about 1.0 kPa, about 5 sec). After 5 minutes, add more water (0.1 mL). Thereafter, similarly, the injection of water (0.1 mL) is repeated every 5 minutes, and the time from the injection of water 5 times (0.5 mL) to the sample until the sample is dried [drying time (repeated)] Measure.

  For each of the above Examples and Comparative Examples, the [Method of measuring liquid diffusion area], [Method of measuring liquid holding amount], [Method of measuring drying time (single injection)] and [Method of measuring drying time (repetitive injection)] Measurement method] The measurement results of the liquid diffusion area, liquid retention, drying time (single injection) and drying time (repetitive injection) measured according to each are shown in the following [Table 1].

From the measurement results shown in Table 1, for example, the following can be understood.
From the measurement results of Examples 1 to 3 and Comparative Example 2, a hydrophilic sheet is disposed between the skin contact surface forming sheet (pressing sheet 27) and the non-skin contact surface forming sheet (outer layer sheet 21). Thus, it can be seen that the sweat absorbed by the waist part is easy to dry (high drying property). From the measurement results of Examples 1 to 3, it can be seen that the use of a hydrophilic sheet with good liquid diffusibility and low liquid retainability maintains the effect of quick drying even when sweating repeatedly. Moreover, it can be seen from the measurement results of Examples 1 and 2 and Comparative Example 2 that the transpiration of sweat is improved by providing the waist with a composite stretchable part that is not bonded to the entire surface. Mainly from the measurement results of Comparative Examples 1 and 3, in the configuration in which the hydrophilic sheet is not disposed in the waist part and all the sheets in the waist part are made of the hydrophobic nonwoven fabric, the quick-drying property is obtained regardless of the presence or absence of the composite stretchable part. It turns out that there is no effect.

FIG. 1 is a perspective view showing a pants-type disposable diaper that is a first embodiment of the absorbent article of the present invention. FIG. 2 is a plan view showing a state in which the pants-type disposable diaper shown in FIG. 1 is developed and extended. FIG. 3 is an exploded perspective view of the pants-type disposable diaper shown in FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. 5 is a cross-sectional view taken along line VV shown in FIG. 6A and 6B are diagrams showing an absorbent core in the pants-type disposable diaper shown in FIG. 1, wherein FIG. 6A is a plan view, FIG. 6B is a cross-sectional view taken along line BB shown in FIG. It is CC sectional drawing shown in FIG. FIG. 7 is an explanatory view showing the iliac bone. FIG. 8 is an explanatory diagram showing a method for calculating the slipping-off force in the wearer's waist flap. FIG. 9 is an explanatory diagram showing a method of measuring the length of the superior anterior iliac spine height. FIG. 10 is a perspective view showing the composite stretchable part in a partially broken view. FIG. 11 is a plan view showing the composite stretchable part in an extended state. FIG. 12 is a perspective view showing the entire contents of one manufacturing method of the pants-type disposable diaper shown in FIG. FIG. 13: is a conceptual diagram centering on the process of forming a composite expansion-contraction part, a non-functionalization area | region, and a leg elastic member cutting area | region among the manufacturing methods of the underpants type disposable diaper shown in FIG. FIG. 14 is a conceptual diagram centering on the step of forming the composite stretchable part of the method for manufacturing the pants-type disposable diaper shown in FIG. 12. FIG. 15 is a cross-sectional view (corresponding to FIG. 5) showing a state before the press-down sheet is folded over the pants-type disposable diaper of the first embodiment. FIGS. 16A and 16B are partially enlarged views of a vertical cross section of the composite stretchable portion, where FIG. 16A is a diagram illustrating an extended state, and FIG. 16B is a diagram illustrating a state in which wrinkles are contracted and wrinkles are formed. FIG. 17 is a conceptual diagram (corresponding to FIG. 13) showing an example in which the joining position of the pressing sheet continuous body is changed in the step of forming the composite stretchable part, the non-functionalized region, and the leg elastic member cutting region. FIG. 18 is a cross-sectional view (corresponding to FIG. 5) in the vicinity of an end portion in the longitudinal direction of a pants-type disposable diaper that is the second embodiment of the absorbent article of the present invention. FIG. 19 is a cross-sectional view (corresponding to FIG. 15) showing a state before the pressing sheet is folded, with respect to the pants-type disposable diaper of the second embodiment. FIG. 20 is a cross-sectional view (corresponding to FIG. 5) in the vicinity of the end in the longitudinal direction of a pants-type disposable diaper that is the third embodiment of the absorbent article of the present invention. FIG. 21 is a cross-sectional view (corresponding to FIG. 5) in the vicinity of the end in the longitudinal direction of a pants-type disposable diaper that is the fourth embodiment of the absorbent article of the present invention. FIG. 22 is a plan view (corresponding to FIG. 11) showing another form of the composite stretchable part in an expanded state. FIG. 23 is a perspective view (corresponding to FIG. 10) showing still another form of the composite stretchable part in a partially broken view. FIG. 24 is a plan view (corresponding to FIG. 11) showing still another form of the composite stretchable part in an expanded state.

Explanation of symbols

1 Pants-type disposable diaper (absorbent article)
DESCRIPTION OF SYMBOLS 11 Side seal part 12 Waist opening part 13 Leg opening part 2 Outer packaging material 21 Outer layer sheet 22 Inner layer sheet 23 Girth elastic member 24 Waist elastic member 25 Leg elastic member 26 Front crotch elastic member 27 Pressing sheet 29 Hydrophilic sheet 3 Absorbent body 32 Top sheet 33 Back sheet 34 Absorbent core 35 Side cuff 36 Side cuff elastic member 37 Side cuff forming sheet 4 Composite stretch part 41 Joint part 42 Composite stretch part forming elastic member 43 ４４ 44 End part 51 Non-functionalization Region 52 Leg elastic member cutting region 61, 66 Nip roll 62 Composite stretchable portion forming roll 62A Composite stretchable portion forming portion 62B Non-functionalized region forming portion 62C Leg elastic member cutting region forming portion 63 Anvil roll 64 Adhesive coating device 65 Oscillating Guide G1 Girth gather G2 U Togather G3 Leg gather G4 Front fore gather 1S Diaper continuum 13S Trim 2S Outer packaging material continuum 2S ' Absorbent body continuum A Abdominal side B Back side C Crotch D Drum circumference D1 Upper girth D2 Lower girth E Front crotch F Waist flap

Claims (8)

An absorbent article comprising an absorbent main body including an absorbent core and waist flaps extending outward in the longitudinal direction from both longitudinal ends of the absorbent main body,
At least the back waist flap includes a skin contact surface forming sheet that forms the skin contact surface and a non-skin contact surface formation sheet that forms the non-skin contact surface, which are formed of a hydrophobic sheet. A hydrophilic sheet is disposed between the forming sheet and the non-skin contact surface forming sheet, and an elastic member is disposed between the hydrophilic sheet and the non-skin contact surface forming sheet,
At least the waist flap on the back side is provided with a waist gather formed from a composite stretchable part,
The composite stretchable part forming sheet is a composite stretchable part forming sheet in which the facing composite stretchable part forming sheet is intermittently joined to the stretchable direction of the composite stretchable part and joined to each other by an intermittent or continuous joint in a direction perpendicular thereto. Each is formed by forming a plurality of ridges extending continuously over a plurality of composite stretchable part forming elastic members,
The facing composite stretchable part forming sheet is composed of another sheet interposed between the hydrophilic sheet and the non-skin contact surface forming sheet and the non-skin contact surface forming sheet, or the hydrophilic sheet and the non-skin contact surface forming sheet. An absorbent article comprising a skin contact surface forming sheet.   In the composite stretchable part, the composite stretchable part forming sheets facing each other are joined to each other by the joint part intermittently in a direction orthogonal to the stretchable direction of the composite stretchable part, and the composite stretchable part forming elastic member is joined to the joined part. The absorbent article according to claim 1, wherein the absorbent article is arranged so as not to pass through and is fixed to a facing composite stretchable part forming sheet at both ends of the composite stretchable part forming elastic member. The ventral waist flap also includes the skin contact surface forming sheet, the non-skin contact surface forming sheet, the hydrophilic sheet, and the elastic member.
The absorptive article according to claim 1 or 2 by which a waist gather formed from said compound expansion-contraction part is provided also in a ventral side waist flap.   The said hydrophilic sheet | seat is an absorptive article in any one of Claims 1-3 arrange | positioned by the non-skin contact surface side of the longitudinal direction edge part of the said absorptive main body. The outer packaging material joined to the non-skin contact surface side of the absorbent main body, and a pressing sheet that covers the skin contact surface side of the longitudinal end of the absorbent main body,
The outer packaging material includes an outer layer sheet, an inner layer sheet, and a plurality of elastic members disposed between both sheets,
The skin contact surface forming sheet is a pressing sheet, the non-skin contact surface forming sheet is an outer layer sheet, and the hydrophilic sheet is a sheet different from both the outer layer sheet and the inner layer sheet, or an inner layer sheet. The absorbent article according to any one of claims 1 to 4.   The outer packaging material is divided in the longitudinal direction into an abdominal side portion, a crotch portion and a back side portion, and both side edges of the abdominal side portion and the back side portion of the outer packaging material are joined together to form a pair of side seal portions and a waist The absorbent article according to claim 5, wherein an opening and a pair of leg openings are formed to form a pants shape.   The absorbent article according to claim 5 or 6, wherein the pressing sheet is formed integrally with the outer layer sheet and is folded back to the skin contact surface side of the absorbent main body.   The absorbent article according to any one of claims 5 to 7, wherein the composite stretchable part forming sheet facing the waist flap includes the outer layer sheet and the inner layer sheet.

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