JP2019180486A - Underpants type absorbent article - Google Patents

Abstract

To provide an underpants type absorbent article which shows an appearance and touch close to underpants of underwear.SOLUTION: An underpants type absorbent article of one embodiment of the invention includes an absorber, a waist part, and a crotch part. The absorber is located at the crotch. The waist part has an abdominal part and a back side part positioned at a waist. The crotch part is positioned between the abdominal part and the back side part and holds the absorber together with the abdominal part and the back side part. At least one of the abdominal part and the back side part is constituted of a stretchable sheet including a first region and a second region positioned on an upper side in a vertical direction that is perpendicular to a circumferential direction of the waist. The stretchable sheet is constituted by including an elastic resin and a non-woven sheet layer internally including the elastic resin and has a contraction stress in the circumferential direction that is different between the first region and the second region, and dimensions in the first region and the second region in the circumferential direction in a natural state are equal.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pants-type absorbent article such as a disposable diaper.

  In a pants-type absorbent article such as a diaper provided with an absorbent body and an exterior body for fixing the absorbent body, a stretchable nonwoven fabric is provided on the waist portion of the exterior body for the purpose of improving fit to the wearer's waistline. (For example, refer to Patent Document 1).

JP 2008-106378 A

  In the pants-type absorbent article, it is desired to have an appearance and tactile sensation similar to those of underwear pants. The subject of this invention is related with the underpants type absorbent article which exhibits the external appearance and tactile sensation which are close to the underwear pants (fabric), maintaining a fit.

The underpants type absorbent article which concerns on one form of this invention has an absorber, a waist part, and a crotch part.
The absorber is located in the crotch.
The waist portion has an abdominal side portion and a back side portion located around the waist.
The crotch part is located between the abdominal side part and the back side part, and holds the absorber together with the abdominal side part and the back side part.
Expansion and contraction in which at least one of the ventral side portion and the dorsal side portion includes a first region and a second region located above the first region in the vertical direction perpendicular to the circumferential direction of the trunk. Consists of sheets.
The elastic sheet includes an elastic resin and a non-woven fabric layer containing the elastic resin, and the first region and the second region have different circumferential shrinkage stresses, and the first region The dimension in the circumferential direction in the natural state is the same in the second area and the second area.

  ADVANTAGE OF THE INVENTION According to this invention, the external appearance and tactile sensation which are close to underwear pants (fabric) are exhibited, maintaining basic performance as fit and a diaper.

It is a perspective view of the disposable diaper which concerns on the 1st-6th embodiment of this invention. It is a schematic exploded perspective view in the deployment state of the disposable diaper of a 1st embodiment. It is a top view showing the deployment state of the disposable diaper of a 1st embodiment, and is the figure seen from the inside. It is a top view which shows the expansion | deployment state of the exterior body of the disposable diaper of 1st Embodiment, and is a figure for demonstrating the pattern of the contact bonding layer in an exterior body. FIG. 4 is a developed schematic perspective view of a region surrounded by an ellipse V in FIG. 3, showing a natural state where the extension of the exterior body is released, and showing a state where the folded portion is developed. It is sectional drawing along the VI-VI line of FIG. (A) is an enlarged plan view showing the first sheet 11 in the region surrounded by the ellipse VIIA of FIG. 4, schematically showing the structure of the first sheet 11, (B) FIG. 8 is a cross-sectional view taken along line VIIB-VIIB in FIG. It is the top view which shows the expansion | deployment state of the disposable diaper of 2nd Embodiment, and is the figure seen from the inner side. It is a top view which shows the expansion | deployment state of the exterior body of the disposable diaper of 3rd Embodiment, and is a figure for demonstrating the pattern of the contact bonding layer in an exterior body. It is a top view which shows the expansion | deployment state of the exterior body of the disposable diaper of 4th Embodiment, and is a figure for demonstrating the pattern of the contact bonding layer in an exterior body. It is a top view which shows the expansion | deployment state of the exterior body of the disposable diaper of 5th Embodiment, and is a figure for demonstrating the pattern of the contact bonding layer in an exterior body. It is a top view which shows the expansion | deployment state of the exterior body of the disposable diaper of 6th Embodiment, and is a figure for demonstrating the pattern of the contact bonding layer in an exterior body. It is an enlarged plan view of the other 1st sheet | seat which comprises the exterior body in 7th Embodiment, and is a figure which shows the structure | tissue of a 1st sheet | seat typically.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the drawing, an X axis, a Y axis, and a Z axis that are orthogonal to each other are shown as necessary.

<First Embodiment>
[Overall configuration of disposable diapers]
The disposable diaper 1 which concerns on the 1st Embodiment of this invention is demonstrated using FIG. The disposable diaper 1 is a pants-type absorbent article for capturing the excrement of an infant who is a wearer without leaking.
The disposable diaper 1 includes an exterior body 8 and an absorber 9. The exterior body 8 constitutes the exterior of the disposable diaper 1. The absorber 9 is held inside the exterior body 8. That is, the exterior body 8 is arranged on the outer surface side of the absorbent body 9 that is directed to the side opposite to the wearer's skin side when worn. Hereinafter, the inner side in each configuration indicates a side located on the skin side of the wearer when wearing the disposable diaper, and the outer side indicates a side opposite to the skin side of the wearer.

  The exterior body 8 includes a waist portion 16 and a crotch portion 17 formed in series. The waist part 16 forms the waist opening part 7, and is arrange | positioned around a wearer's waist. The waist part 16 is comprised with the expansion-contraction sheet | seat which can be expanded-contracted over a trunk periphery direction so that a wearer's trunk periphery may be fitted. In FIG. 1, the crotch portion 17 is located below the waist portion 16 and is disposed on the wearer's crotch.

  The waist part 16 has an abdominal side part 16a arranged on the front side when worn and a back side part 16b arranged on the rear side. The abdominal side portion 16a and the back side portion 16b are joined by, for example, heat sealing or ultrasonic sealing at the side seal portions 18 provided at both ends in the width direction orthogonal to the front-rear direction. Thereby, the waist part 16 becomes a cylinder shape and the waist opening part 7 is formed between the abdominal side part 16a and the back side part 16b.

  The crotch portion 17 is located between the ventral side portion 16a and the dorsal side portion 16b. The crotch portion 17 connects the abdominal side portion 16a and the back side portion 16b so as to form a pair of leg openings 14 through which the wearer's legs are inserted on both sides in the width direction. The leg crotch portion 17 is provided with a leg gather 19 including a rubber thread 19 a disposed along the leg opening 14. The leg gather 19 fits the wearer's leg inserted through the leg opening 14 by the expansion and contraction of the rubber thread 19a.

The disposable diaper 1 and the exterior body 8 shown in FIGS. 2 to 4 are separated from the ventral side portion 16a and the back side portion 16b by peeling the side seal portion 18 from the state shown in FIG. This is a state where the body 9 is extended along the XY plane.
FIG. 3 illustrates a state in which the second sheet 12 constituting the exterior body 8 is positioned on the near side and the first sheet 11 is positioned on the back side, and the absorber 8 is illustrated by a dotted line for convenience. In FIG. 3, in order to show the laminated state of the exterior body 8, the lower right corner portion of the back side portion 16 b of the second sheet 12 and the adhesive layer 13 positioned corresponding thereto are cut out and positioned on the back side. The first sheet 11 is shown so that it can be seen. The same applies to FIG. 8 described later.
FIG. 4 illustrates a state in which the first sheet 11 constituting the exterior body 8 is positioned on the near side and the second sheet 12 is positioned on the back side, and the adhesive layer 13 is illustrated by a solid line for convenience. In FIG. 4, in order to show the laminated state of the exterior body 8, the second sheet is located on the back side by cutting out the lower right corner portion of the first sheet 11 and the adhesive layer 13 positioned corresponding thereto. 12 so that 12 can be seen. The same applies to FIGS. 9 to 12 described later.

  As shown in FIG. 2, the exterior body 8 includes a composite sheet 10 in which a first sheet 11 and a second sheet 12 are bonded together with an adhesive layer 13. In the opening peripheral edge 15 of the waist opening part 7 of the disposable diaper 1, the 1st sheet | seat 11 which comprises the exterior body 8 becomes the form folded back inside. 3 shows a state where the folded portion 20 of the first sheet 11 is folded inward, and FIG. 4 shows a state where the folded portion 20 is unfolded.

In the disposable diaper 1 shown in FIGS. 2 and 3 and the outer package 8 shown in FIG. 4, the X-axis direction corresponds to the front-rear direction, the Y-axis direction corresponds to the width direction, and the Z-axis direction corresponds to the thickness direction. The circumferential direction of the trunk in the ventral side portion 16a and the back side portion 16b of the waist portion 16 in FIG. 1 corresponds to the width direction Y in FIGS.
Hereinafter, in the description of the waist part 16, it may be described as the vertical direction. The vertical direction corresponds to the vertical direction of the disposable diaper 1 when the wearer wears the disposable diaper 1 in a standing state. The front-rear direction and the vertical direction coincide with each other. Hereinafter, the disposable diaper 1 is demonstrated in the aspect shown in FIGS.

As shown in FIGS. 1-3, the absorber 9 is comprised so that the liquid contained in excrement can be absorbed while capturing excrement. The absorber 9 is formed in a band shape, and is arranged in a wide range from the crotch portion 17 in the exterior body 8 to the abdomen side portion 16a and the back side portion 16b of the waist portion 16. Thereby, in the disposable diaper 1, since a wearer's inseam is covered with the absorber 9 over a wide range, even if a wearer moves, excrement is hard to leak.
Further, the absorber 9 absorbs liquid mainly in a region where excrement is captured in the crotch part 17. The liquid absorbed by the absorber 9 is sucked up toward the waist portion 16 without staying in the region. That is, the absorbent body 9 can hold the liquid in a wide range across the crotch portion 17 and the waist portion 16. Thereby, in the disposable diaper 1, a sufficient amount of liquid can be absorbed by the absorber 9.

  As shown in FIG. 2, the exterior body 8 is composed of a composite sheet 10 that is an elastic sheet. The composite sheet 10 includes a first sheet 11 made of a stretchable nonwoven fabric composed of a nonwoven fabric layer containing an elastic resin, a second sheet 12 made of a non-stretchable nonwoven fabric facing the first sheet 11, and a first sheet The sheet 11 and the second sheet 12 are bonded to each other. The first sheet is a stretchable sheet, and the second sheet is a non-stretchable sheet. Here, the stretchable nonwoven fabric means one having a recovery rate (elongation recovery rate) of 70% or more when stretched at least 100% in the same direction as the shrinkage direction. Further, the elongation of the stretchable nonwoven fabric (first sheet) used in this embodiment is preferably 100% or more, and more preferably 150% or more. In the present embodiment, the second sheet 12 is provided facing the inside of the first sheet 11, and the first sheet 11 is located on the outer surface 8 a side of the exterior body 8. Details of the sheets 11 and 12 and the adhesive layer 13 constituting the exterior body 8 will be described later.

  The waist part 16 of the exterior body 8 has elasticity in the circumferential direction of the trunk. As shown in FIG. 3, the ventral side portion 16 a (back side portion 16 b) of the waist portion 16 of the exterior body 8 that is required to be stretchable in the trunk circumferential direction is different in the contraction stress in the circumferential direction of the trunk from each other. It has the area | region 31a (1st area | region 31b), the 2nd area | region 32a (2nd area | region 32b), and the 3rd area | region 33a (3rd area | region 33b). The first region 31a (first region 31b), the second region 32a (second region 32b), and the third region 33a (third region 33b) are in a natural state (stress release state). The dimensions of the cylinder in the circumferential direction are equal. Hereinafter, the tensile load (cN) per unit length (1 mm) when the sheet is stretched to 185% of the length of the natural state in the circumferential direction and then contracted to 140% is expressed as the contraction stress of the sheet. And

The first region 31 (second region 32, third region 33) is the first region 31a on the ventral side (second region 32a on the ventral side, third region 33a on the ventral side). And the first region 31b of the back side part (the second region 32b of the back side part, the third region 33b of the back side part). This is referred to as a region 31 (second region 32, third region 33).
3 and 4, the stretchable area is indicated by a dot pattern, and the degree of contraction stress in each area is indicated by the density of the dot pattern. The higher the shrinkage stress, the higher the density of the dot pattern, and the lower the density, the lower the density. The same applies to the dot patterns in the drawings used for the description of other embodiments described later.

  The first region 31, the second region 32, and the third region 33 are different in contraction stress from each other. Specifically, in the present embodiment, the contraction stress is highest in the first region 31, next highest in the third region 33, and lowest in the second region 32. That is, when the first to third regions 31 to 33 are elongated at the same elongation rate, the force (shrinkage stress) for contracting and returning to each region is different. Thereby, when the waist part 16 is extended | stretched with the same expansion | extension rate, a different clamping pressure for every area | region will be applied to a wearer. In the present embodiment, the second region 32 and the third region 33 are located above the first region 31 in the vertical direction perpendicular to the circumferential direction of the trunk. That is, the contraction stress is configured to be higher on the lower side than on the upper side of the waist portion 16.

The third region 33 is located at the opening peripheral edge 15 that is the upper edge of the exterior body 8. The composite sheet 10 constituting the exterior body 8 is folded inward toward the lower side in the vertical direction to form the third region 33. The length of the third region 33 in the vertical direction is equal to or less than ½ of the length of the second region 32 in the vertical direction, and is approximately １ ／ in the present embodiment.
Specifically, as shown in FIG. 2, in the composite sheet 10, the first sheet 11 has a portion that extends more than the second sheet 12 at both ends in the front-rear direction, and the extended portion is a folded portion. It is 20. The folding unit 20 is folded using the positions of both end edges in the front-rear direction of the second sheet 12 as folding positions. This folding position corresponds to the position of the opening peripheral edge 15 when the disposable diaper 1 is used.

[Detailed structure of exterior body]
Hereinafter, each structure of the exterior body 8 is demonstrated in detail using FIGS. 5 and 6 both show partial views of the dorsal side portion 16b, but the ventral side portion 16a also has the same configuration.

(First sheet)
The first sheet 11 is a single-layer stretchable nonwoven fabric formed continuously from the ventral side portion 16a through the crotch portion 17 to the backside portion 16b, that is, a stretchable nonwoven fabric composed of one sheet.
As shown in FIGS. 2, 4, and 5, the first sheet 11 has an extending portion that extends beyond the second sheet 12 at both ends in the front-rear direction. This extending portion is a folded portion 20 that is folded inward. A folded portion where the folded portion 20 is folded becomes a third region 33. As shown in FIG. 6, in the third region 33, two first sheets 11, one second sheet 12, and two adhesive layers 13 are laminated, and the first sheet 11 is The structure is double.

As shown in FIG. 4, the first sheet 11 of the waist portion 16 of the exterior body 8 has a high contraction stress region P <b> 1 and a low contraction stress region in which the contraction stress is different in the front-rear direction in the expanded state in which the folded portion 20 is expanded. P2. The shrinkage stress differs between the high shrinkage stress region P1 and the low shrinkage stress region P2. In the present embodiment, the shrinkage stress in the low shrinkage stress region P2 is lower than that in the high shrinkage stress region P1. Further, the width dimension of the low shrinkage stress region P2 is equal to the width dimension of the high shrinkage stress region P1.
The high shrinkage stress region P1 corresponds to the first region 31.
The low shrinkage stress region P <b> 2 corresponds to the second region 32 and the third region 33. In the second region 32, the low contraction stress region P2 of the first sheet 11 is located in a single layer, whereas in the third region 33, the low contraction stress region P2 of the first sheet 11 is located double. is doing. For this reason, the contraction stress is higher in the third region 33 than in the second region 32.
As described above, the first sheet 11 of the exterior body 8 of the present embodiment has the high contraction stress region P1 and the low contraction stress region P2 that have different contraction stresses in the front-rear direction before the assembly of the exterior body 8. It has become.

As shown in FIG. 7, the first sheet 11 is a stretchable nonwoven fabric having a plurality of elastic filaments 42 and a nonwoven fabric layer 41 containing the elastic filaments 42. The first sheet 11 includes a nonwoven fabric layer 41 extending along the XY plane, and an elastic filament 42 as an elastic resin contained in the nonwoven fabric layer 41.
The nonwoven fabric layer 41 is formed of a nonwoven fabric composed of fibers with low elasticity. The nonwoven fabric which forms the nonwoven fabric layer 41 is not limited to a specific kind, For example, it can select from an air through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spun bond nonwoven fabric, a melt blown nonwoven fabric, etc. Moreover, the fiber which comprises the nonwoven fabric layer 41 is not limited to a specific kind, For example, it can select from chemical fibers, such as polyethylene, a polypropylene, polyester, polyamide. Furthermore, the nonwoven fabric layer 41 may be comprised with the composite fiber containing several types of chemical fiber. In addition, the fibers constituting the nonwoven fabric layer 41 may be blended with natural fibers such as cotton and silk.
The elastic filament 42 is a thread-like elastic body that extends along the Y-axis direction. The plurality of elastic filaments 41 are arranged at equal intervals in the X-axis direction in the waist portion 16. The elastic filament 42 can be formed of, for example, an elastic material such as a thermoplastic elastomer or rubber. In particular, the elastic filament 42 is preferably formed of a thermoplastic elastomer that is easily fused with the fibers constituting the nonwoven fabric layer 41. As the thermoplastic elastomer that forms the elastic filament 42, for example, a styrene elastomer, an olefin elastomer, a polyester elastomer, a polyurethane elastomer, or the like can be used. The elastic filament 42 can also be formed by combining a plurality of types of thermoplastic elastomers. Further, the elastic filament 42 may be a core-sheath type or a side-by-side type composite fiber.

  In the first sheet 11, stretchable portions 11a and connecting portions 11b extending in the X-axis direction are alternately arranged along the Y-axis direction. In the 1st sheet | seat 11, the basic weight of the nonwoven fabric layer 41 in the expansion-contraction part 11a is lower than the basic weight of the nonwoven fabric layer 41 in the connection part 11b. For this reason, it is easy to deform | transform in the Y-axis direction in the expansion-contraction part 11a rather than the connection part 11b. In the nonwoven fabric layer 41, strength is ensured by the connecting portion 11b which is not easily deformed.

In the stretched state of the first sheet 11 in the waist part 16, a force for stretching in the Y-axis direction is applied, so that the stretchable part 11a mainly stretches in the Y-axis direction. In this embodiment, in the 1st sheet | seat 11 of the expansion | extension state, although both the connection part 11b and the expansion-contraction part 11a expand | extend, the expansion / contraction part 11a expand | extends largely compared with the connection part 11b. In addition, the connection part 11b may be in a state where it does not substantially extend, and the expansion / contraction part 11a only needs to have a higher degree of extension than the connection part 11b.
On the other hand, the first sheet 11 in the waist portion 16 contracts in the Y-axis direction by the elastic force of the elastic filament 42 when the force for extending in the Y-axis direction from the extended state is released. In the contracted first sheet 11, the dimension of the stretchable portion 11 a in the Y-axis direction is smaller than that in the expanded first sheet 11. Thus, the 1st sheet | seat 11 is an elastic nonwoven fabric which can be expanded-contracted in a Y-axis direction.

  The elastic filaments 42 are made of elastic fibers and are arranged at equal intervals in the X-axis direction. In the present embodiment, the first region 31 is provided with an elastic filament 42a composed of a relatively thick elastic fiber, and the second region 32 is composed of a relatively thin elastic fiber. The elastic filament 42b is disposed. Thereby, the contraction stress of the 1st field 31 and the 2nd field 32 can be varied.

  As described above, in the composite sheet 10, the first sheet 11 itself can be expanded and contracted by the elastic force of the elastic filament 42. For this reason, in the composite sheet 10, the waist portion 16 of the exterior body 8 can be expanded and contracted in the trunk circumferential direction in FIG. 1 using the stretchability of the first sheet 11. Therefore, the composite sheet 10 can be configured such that an elastic body such as rubber thread is not provided between the first sheet 11 and the second sheet 12.

The first sheet 11 can be manufactured by any manufacturing method. For example, the first sheet 11 can be manufactured using the elastic filament 42 and two non-woven fabrics. In this manufacturing method, first, a laminate is formed by sandwiching an elastic filament 42 melt-spun between two nonwoven fabrics. Thereby, the nonwoven fabric and the elastic filament 42 are fused.
In the 1st sheet | seat 11 of this step, the basic weight of the nonwoven fabric layer 41 is constant, and the expansion-contraction part 11a and the connection part 11b are not formed. In order to form the expansion / contraction part 11a and the connection part 11b in the 1st sheet | seat 11, the extending | stretching process extended in the Y-axis direction can be added only with respect to the expansion / contraction part 11a, for example. Thereby, only the basic weight of the expansion-contraction part 11a can be reduced, maintaining the basic weight of the connection part 11b.

Arbitrary methods can be used for the stretching process for forming the stretchable part 11a and the connecting part 11b in the first sheet 11, for example, a roll stretching process using two tooth groove rolls meshing with each other is used. be able to. In this roll stretching process, the first sheet 11 is intermittently stretched by biting the first sheet 11 between the rotated tooth gap rolls, and the stretchable portions 11a and the connecting portions 11b are alternately arranged. It is formed. By rolling a laminate formed by sandwiching the elastic filament 42 between two nonwoven fabrics, the two nonwoven fabrics are stretched to form the nonwoven fabric layer 41.
Thus, since the first sheet 11 is formed by fusing the nonwoven fabric and the elastic filament 42 sandwiched between the nonwoven fabric, the elastic filament 42 is not exposed on the surface of the nonwoven fabric layer 41 and is included in the nonwoven fabric layer 41. Thus, the first sheet 11 can be expanded and contracted by one sheet.

  In this manufacturing method, the first sheet 11 can be manufactured without using an adhesive. For this reason, in the 1st sheet | seat 11, the touch of the nonwoven fabric layer 41 is not impaired with an adhesive agent. Further, in the first sheet 11, the touch of the nonwoven fabric layer 41 is not impaired by the elastic filaments 42 included in the nonwoven fabric layer 41. For this reason, in the 1st sheet | seat 11, the original soft touch of the nonwoven fabric layer 41 is obtained as it is.

Moreover, the elastic resin included in the nonwoven fabric layer 41 in the first sheet 11 is not limited to the configuration using the elastic filament 42 as long as it has at least the elasticity in the Y-axis direction.
For example, the elastic resin included in the nonwoven fabric layer in the first sheet 11 may be an elastic fiber made of short fibers, for example. The elastic filaments are arranged so that the elastic fibers extend in one direction without crossing each other. However, when elastic fibers made of short fibers are used, the elastic fibers may be randomly arranged or any one of them. You may arrange | position so that it may orientate in a direction. Even in these configurations, since the nonwoven fabric layer 41 can be fused to the elastic resin, the first sheet 11 can be manufactured without using an adhesive.

(Adhesive layer)
As shown in FIG. 2, the adhesive layer 13 is composed of a plurality of adhesive portions 21 disposed between the first sheet 11 and the second sheet 12. As shown in FIG. 5, the adhesive layer 13 extends over the first region 31a (first region 31b) and the second region 32a (second region 32b) of the ventral side portion 16a (back side portion 16b). , Arranged to form a series of patterns.

In the present embodiment, the adhesive layer 13 is provided in a series of patterns over the entire region of the abdominal side portion 16a including the stretchable region and the entire region of the back side portion 16b. The adhesive layer 13 is composed of a plurality of adhesive portions 21 arranged at intervals in the circumferential direction of the trunk. The bonding portion 21 extends over the first region 31a (first region 31b) and the second region 32a (second region 32b) of the ventral side portion 16a (back side portion 16b). Each of the plurality of adhesive portions 21 continuously extends in a narrow strip shape with an equal width along one direction, in this embodiment, the vertical direction, and is intermittently arranged at equal intervals in the circumferential direction of the body.
In the present embodiment, the example in which the adhesive layer 13 is provided on the waist part 16 having the stretchable area has been described. However, the adhesive layer 13 may also be provided in the crotch part 17 in a series of patterns continuously to the waist part 16. Good.

The adhesive layer 13 is typically formed of an adhesive. As a method for forming the adhesive layer, for example, various printing methods and various transfer methods can be used. As the printing method, for example, gravure printing, letterpress printing, offset printing, or the like can be used. As the transfer method, for example, roll transfer or thermal transfer can be used.
A hot melt adhesive is used as the adhesive forming the adhesive layer 13. In addition to the hot melt adhesive, the adhesive layer 13 can be formed of various adhesives such as a thermoplastic adhesive and a reactive adhesive. The adhesive layer 13 can also be formed of various adhesive members other than the adhesive. As such an adhesive member, for example, a sheet-like member having adhesiveness on both sides, such as a double-sided tape, can be mentioned.

(Second sheet)
The second sheet 12 made of a non-stretchable nonwoven fabric constituting a part of the composite sheet 10 can be composed of any non-stretchable member that is difficult to stretch in the Y-axis direction. As the non-stretchable member constituting the second sheet 12, for example, a nonwoven fabric, a woven fabric, paper, or the like can be used. As an example, the second sheet 12 can be composed of a nonwoven fabric using fibers similar to the nonwoven fabric layer 41 of the first sheet 11 in order to obtain the same feel as the first sheet 11.

  As shown in FIG. 2, the outer shape of the second sheet 12 substantially matches the shape obtained by removing the folded portion 20 from the state in which the first sheet 11 is stretched. Since the adhesive layer 13 extends in the vertical direction and is intermittently arranged in the circumferential direction of the cylinder, the stretched first sheet 11 and second sheet 12 are bonded together via the adhesive layer 13. Thereafter, in the natural state of the exterior body 8 in which the extended state of the first sheet 11 is released, as shown in FIG. 5, the second sheet 12 protrudes on the side opposite to the first sheet 11. A portion 35 is formed. The raised portion 35 is formed by the second sheet 12 that swells in a direction away from the first sheet 11 between adjacent rows of the bonding portions 21.

In the present embodiment, as shown in FIG. 4, the plurality of adhesive portions 21 constituting the adhesive layer 13 are intermittently arranged at equal intervals in the circumferential direction of the trunk, so that each raised portion 35 extends in the vertical direction. A plurality of lines are arranged at equal intervals in the circumferential direction, and wrinkles having a uniform pattern are formed inside the waist portion 16 of the exterior body 8 within the surface. As described above, in the disposable diaper 1, the plurality of raised portions 35 of the second sheet 12 form a series of patterns in a natural state where no extension is applied.
Here, the series of patterns includes a pattern formed by the plurality of raised portions 35 formed in the first region 31 and a pattern formed by the plurality of raised portions 35 formed in the second region 32. It is the same, and it means a state where the flow of the pattern formed in each region continues without interruption even near the boundary between the first region 31 and the second region 32.

  In this embodiment, since the 2nd sheet | seat 12 is distribute | arranged inside the disposable diaper 1, the protruding part 35 is formed inside the disposable diaper 1. FIG. On the other hand, since the 1st sheet | seat 11 is located in the outer side of the disposable diaper 1, a protruding part is not formed in the outer surface of the disposable diaper 1. FIG.

[Method of manufacturing exterior body]
The exterior body 100 is formed by arranging the adhesive layer 13 on the first sheet 11 stretched at a constant stretch rate and bonding the adhesive layer 13 to the second sheet 12. Here, bonding at a constant elongation rate means bonding the second sheet 12 in a state where the high shrinkage stress region P1 and the low shrinkage stress region P2 of the first sheet 11 are stretched at the same elongation rate. Say.

Specifically, in a state where the first sheet 11 is stretched at a constant stretch rate, the adhesive layer 13 is disposed over the entire region corresponding to the waist portion 16 including the folded portion 20 as shown in FIG. The second sheet 12 is overlaid on the first sheet 11 on which the adhesive layer 13 is disposed, and both are adhered by the adhesive layer 13. In this state, the folded portion 20 extends from a region where the first sheet 11 and the second sheet 12 overlap each other, and the adhesive layer 13 is disposed on the folded portion 20.
After the second sheet 12 is bonded to the first sheet 11, the extended folded portion 20 is folded inside the exterior body 8, and the folded portion 20 and the second sheet 12 are bonded together. Thereby, the exterior body 8 is formed.
Next, after adhering and fixing the absorbent body 9 to the inside of the extended exterior body 8, the back side portion 16b and the abdominal side portion 16a are overlapped in a state where the extended state is maintained, and the corresponding side edges are joined to each other. A seal portion 18 is formed. Thereby, the pants-type disposable diaper 1 is manufactured.
In the manufactured disposable diaper 1, a series of raised portions 35 are formed inside in a natural state where no tension is applied from the outside.

[Measurement method of elongation recovery rate and elongation]
The elongation recovery rate and elongation of the stretchable nonwoven fabric used for the first sheet 11 can be measured as follows.
(Measurement method of elongation recovery rate)
A sample piece of stretchable nonwoven fabric having a length of 50 mm and a width of 25 mm was prepared, and the sample piece was fixed at a chuck interval L0 using a Tensilon tensile tester (“Autograph AG-X” manufactured by Shimadzu Corporation), and 300 mm / After extending to the length L2 (L2 = L0x2) at the time of 100% extension at a speed of min, the length of the sample piece is extended when the tensile load becomes 0 after starting to return at the same speed as the tensile speed. The length is L1 after recovery. The elongation recovery rate at 100% elongation is calculated from the following equation.
Elongation recovery rate at 100% elongation (%) = {(L2-L1) / (L2-L0)} × 100
(Measurement method of elongation)
A sample piece having the same size as that of the sample piece used in the method for measuring the elongation recovery rate is stretched under the same conditions as the measurement of the elongation recovery rate, and the elongation at the time of breaking is defined as the elongation.

[Measuring method of dimensions of first region and second region in circumferential direction]
The disposable diaper 1 is placed on a desk in a natural state, and the circumference between the side seal portion 18 and the region sandwiched between the extension lines of the pair of side edges of the absorbent body 9 that defines the width direction of the absorbent body 9. By measuring the width in the direction, the dimensional relationship in the circumferential direction in the natural state between the first region 31 and the second region 32 in the exterior body 8 can be seen.
In the present embodiment, the first region and the second region have the same circumferential dimension in the natural state. That is, the distance in the circumferential direction between the side seal portion 18 and the extension line of the side edge portion of the absorber 9 is equal. Here, being equal means that the distance value in one region is within the range of 95% to 105% of the distance in the other region.

[Method of measuring shrinkage stress value, size of each region, and shrinkage stress value]
(Shrinkage stress value, dimensions of each region)
The preferable shrinkage stress value in the exterior body 8 is as follows.
The shrinkage stress of the first region 31 is preferably 1.4 cN / mm or more, more preferably 2 cN / mm or more, and preferably 5 cN / mm or less, and preferably 1.4 cN / mm or more and 5 cN / mm. mm or less, more preferably 2 cN / mm or more and 5 cN / mm or less.
The shrinkage stress of the second region 32 is preferably 0.1 cN / mm or more, more preferably 0.5 cN / mm or more, preferably 3 cN / mm or less, more preferably 2.5 cN / mm or less, And it is preferably 0.1 cN / mm or more and 3 cN / mm or less, more preferably 0.5 cN / mm or more and 2.5 cN / mm or less.
The shrinkage stress of the third region 33 is preferably 1.4 cN / mm or more, more preferably 1.5 cN / mm or more, preferably 4 cN / mm or less, more preferably 3.5 cN / mm or less. And it is preferably 1.4 cN / mm or more and 4 cN / mm or less, more preferably 1.5 cN / mm or more and 3.5 cN / mm or less.
In addition, these numerical values are suitably set according to the size of the disposable diaper according to the size of the wearer's body.

The shrinkage stress of the first region 31 is preferably 1.2 times or more, more preferably 1.4 times or more, and preferably 3 times or less, more preferably 2.5 times that of the second region 32. It is preferably 2 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.4 times or more and 2.5 times or less.
The shrinkage stress of the first region 31 is preferably 1.1 times or more, more preferably 1.5 times or more, and preferably 2.5 times or less, more preferably 2 times that of the third region 33. It is preferably 1 to 2.5 times, more preferably 1.5 to 2 times.

The dimensions in each region are preferably set as follows.
The length of the first region 31 in the vertical direction is preferably 1.0 times or more, more preferably 1.2 times or more, and preferably 2 times or less, more preferably the length of the second region 32. 1.8 times or less, and preferably 1.0 times or more and 2 times or less, more preferably 1.2 times or more and 1.8 times or less.
The length of the third region 33 in the vertical direction is preferably ½ or less of the length of the second region 32.
The length in the vertical direction of the third region 33 is preferably 0.5 cm or more, preferably 5 cm or less, more preferably 3 cm or less, still more preferably 1.5 cm or less, and preferably 0.5 cm. It is not less than 5 cm, more preferably not less than 0.5 cm and not more than 3 cm, still more preferably not more than 0.5 to 1.5 cm. Specific dimensions differ depending on the size of the disposable diaper 1.

The shrinkage stress of the first to third regions 31 to 33 of the exterior body 8 can be measured as follows.
(How to make a sample for shrinkage stress measurement of exterior body)
The side seal portion 18 of the disposable diaper 1 is peeled off, and the outer body 8 is extended at the same ratio in any of the first to third regions 31 to 33 of the outer body 8, and is unfolded and spread on a plane. For each of the ventral side portion 16a and the back side portion 16b, cut along the straight line parallel to the width direction from each of the first to third regions 31 to 33, and further cut along the straight line parallel to the front-rear direction. And cut out a rectangular sample. The sample is a region other than the region facing the absorber 9 of the outer package 8 when seen in plan view, on an extension line of a pair of side edges of the absorber 9 that defines the width direction of the absorber 9 Cut out from the area outside the sandwiched area. After cutting, the sample in the stress release state (natural state) is cut out so that the size of the belt is 70 mm along the width direction and 50 mm along the front-rear direction, and a sample with a width of 50 mm and a length of 70 mm is obtained. create. When it is difficult to form a 70 mm sample in the width direction, the length is changed as appropriate.
(Measuring method)
Both sides in the length direction (corresponding to the width direction in the disposable diaper) of the sample of each cut out region are fixed between a pair of chucks of the Tensilon tensile tester. The sample is fixed by sandwiching a portion having a width of 10 mm from the edge at each of both ends in the length direction of the sample. The chuck interval is 50 mm, and the sample is fixed in a natural state (a state in which the sample is naturally contracted without applying an external force). The chuck interval is appropriately adjusted according to the length of the sample piece. The sample was stretched at 300 mm / min in the same direction as the diaper width direction (sample length direction), and the sample length (distance between chucks) was 185% of the length in the natural state. The tensile load (cN) per unit length (1 mm) in the width direction when contracted to a length of 140% after extending to the time is defined as the contraction stress. The reason why 140% is used as an index is to reproduce the stretched state of the sample when the pants-type disposable diaper 1 is worn.

[Thickness of elastic fiber]
The thickness of the elastic fiber of the elastic filament 42a used in the first region 31 is preferably 20 μm or more, more preferably 40 μm or more, preferably 400 μm or less, more preferably 300 μm or less, and preferably 20 μm. It is not less than 400 μm, more preferably not less than 40 μm and not more than 300 μm.
The thickness of the elastic fiber of the elastic filament 42b used in the second region 32 is preferably 10 μm or more, more preferably 20 μm or more, preferably 300 μm or less, more preferably 250 μm or less, and preferably 10 μm. It is not less than 300 μm, more preferably not less than 20 μm and not more than 250 μm.
The thickness of the elastic fiber used for the first region 31 is preferably 1.2 or more, more preferably 1.5 times or more, and preferably 3 times that of the elastic fiber used for the second region 32. It is not more than twice, more preferably not more than 2.5 times, and preferably not less than 1.2 times and not more than 3 times, more preferably not less than 1.5 times and not more than 2.5 times.
The thickness of the elastic fiber corresponds to the fiber diameter of the elastic fiber.

[Operational effects of this embodiment]
In the disposable diaper 1 of the present embodiment, the first sheet 11 for imparting stretchability to the composite sheet 10 constituting the abdominal side portion 16a and the back side portion 16b is a single piece seamlessly in the vertical direction. It has a configuration in which regions of different shrinkage stress exist. Thereby, the disposable diaper 1 which has the appearance and touch like underpants of uniform underwear like a cloth without a cut | interruption in a sheet | seat in the abdominal side part 16a whole region and the back side part 16b whole region can be obtained.

  In the present embodiment, both the high contraction stress region P1 corresponding to the first region 31 of the first sheet 11, the low contraction stress region P2 corresponding to the second region 32 and the third region 33 are constant. The outer sheet 8 is manufactured by pasting the second sheet 12 in a state where the outer sheet 8 is stretched at a stretch rate of. Thereby, the exterior body 8 at the time of expansion | extension open | release can give uniform texture like a cloth in the whole region of the waist part 16, irrespective of the area | region where the magnitude | sizes of shrinkage stress differ. Further, the outer package 8 manufactured in this way is in a natural state, and the first region 31 and the second region 32 of the outer package 8 have the same circumferential dimension, and the first region 31 and the second region 32 have the same dimensions. The shrinkage stress in the trunk circumferential direction is different from that in the region 32.

In the present embodiment, the second region 32 located on the upper side of the waist portion 16 and the first region 31 located on the lower side of the third region 33 are configured to have higher contraction stress. Therefore, it is possible to effectively prevent the disposable diaper 1 from slipping off during wearing.
Wearers, especially infants, have a waist that stretches out as a physical feature, so if the tightening force of the part that abuts the waist around the waist is increased, the tightening force is high, so it is disposable. The waist part of the diaper is gradually narrowed down, and the waist part tends to be shifted to a site where the belly circumference becomes thin.
In the present embodiment, the first region 31 having a high contraction stress is provided on the lower side of the waist portion 16 so that a region where the tightening force of the waist portion 16 is relatively high comes into contact with a portion where the waistline is narrowed. It is possible to effectively prevent slipping during wearing. In order to effectively prevent such slipping during wearing, the second region 32 and the third region 33 located on the upper side of the waist portion 16 and the first region 31 located on the lower side It is preferable that the relationship between the shrinkage stress is in the above-described range.

  Thus, in this embodiment, since the abdominal side part 16a and the back side part 16b are comprised so that it may be provided with the area | region where contraction stress differs from each other by the stretchable nonwoven fabric (1st sheet | seat 11) with no joint. Thus, the disposable diaper 1 having a function as a diaper, a good fit, and an appearance and a touch like an underwear pant with a uniform texture like a fabric can be obtained.

In the present embodiment, the vicinity of the opening peripheral edge 15 of the waist opening 7 corresponds to the third region 33. The third region 33 has a higher contraction stress than the second region 32 located immediately below the third region 33, and has a lower contraction stress than the first region 31. Yes.
In general underwear pants, rubber is used at the waist. In the present embodiment, by providing the third region 33 having a higher contraction stress than the second region 32, the wearer is given a moderate tightening feeling at the waist opening end when worn, like underwear pants. A comfortable wearing feeling can be given to the wearer. In addition, by providing the third region 33, the waist opening 7 of the disposable diaper 1 is widened by the operator during wearing work and stretched like underwear pants when the leg is passed through the leg opening 14 or the like. A feeling can be given to the worker.

  In addition, by setting the length of the third region 33 in the front-rear direction within the above range, it is possible to give the wearer a feeling of wearing close to that of general underwear pants in which rubber is used for the waist. .

In the present embodiment, the raised portions 35 form a series of patterns across the first region 31 and the second region 32 in the ventral side portion 16a and the dorsal side portion 16b. Thereby, in the abdominal side part 16a and the back side part 16b of the disposable diaper 1, a seamless pattern is formed without interruption, and the disposable diaper 1 having an appearance and a tactile sensation like an underpant of a uniform texture such as a cloth is obtained. be able to.
Further, each raised portion 35 forms a hollow portion extending along the vertical direction together with the first sheet 11. At the same time, at the time of wearing, the raised portion 35 forms a hollow portion extending along the vertical direction also between each raised portion 35 and the skin (outside the raised portion 35). The hollow portion formed inside and outside the raised portion 35 can function as an air passage through which air flows, and can make the composite sheet 10 excellent in cushioning properties and air permeability.

<Other embodiments>
Hereinafter, as other embodiments, the second to seventh embodiments will be described. In any of the embodiments, an adhesive layer is provided on the ventral portion and the dorsal portion as in the first embodiment. A composite sheet composed of a first sheet and a second sheet pasted together is used, and a composite sheet having a contraction stress distribution similar to that of the first embodiment is used for the waist portion of the exterior body. Yes.

Also in the following embodiment, similarly to the first embodiment, the first sheet having the first region and the second region having mutually different shrinkage stresses in the vertical direction is constituted by one stretch nonwoven fabric without seams. Has been. Thereby, it is possible to obtain a disposable diaper having an appearance and a tactile sensation like an underwear pant having a uniform texture such as a cloth in the entire region of the abdomen and the back region.
Also in the following embodiments, the second region located above the waist and the first region located below the third region are configured to have higher contraction stress. Therefore, it is possible to effectively prevent the slippage during wearing of the disposable diaper. The contraction stress of the third region may be the same as that of the first contraction region, and the first region positioned below the second region positioned relatively above is relatively low. Since the contraction stress becomes higher, it is possible to effectively prevent slipping during wearing.
Also in the following embodiment, by providing a third region having a higher shrinkage stress than the second region, the wearer is given a moderate tightening feeling at the end of the waist opening when worn, and is worn like underwear A feeling can be given. In addition, by providing the third region, the waist opening of the disposable diaper is widened by the operator during wearing work, and when the leg is passed through the leg opening portion, the operator feels like stretching underwear. Can do.
Also in the following embodiment, in the waist portion, the raised portions formed by the second sheet form a series of patterns over the first region and the second region. Thereby, a smooth pattern is formed on the abdominal side and the back side without interruption, and a disposable diaper having an appearance and a tactile sensation like underpants with uniform texture like fabric can be obtained.
Hereinafter, the second to seventh embodiments will be described in detail. Components similar to those in the first embodiment are denoted by the same reference numerals, and description thereof may be omitted.

<Second Embodiment>
The disposable diaper 2 which concerns on this embodiment is demonstrated using FIG.1 and FIG.8. FIG. 8 illustrates a state where the folded portion 20 is not expanded.
The disposable diaper 2 shown in FIG. 1 includes an exterior body 28 and an absorber 9. The disposable diaper 2 of the present embodiment has a configuration in which an elastic body 29 is added to the configuration of the disposable diaper 1 shown in the first embodiment. As shown in FIG. 8, the elastic body 29 is disposed in the third region 33. As the form of the elastic body 29, a thread-like one such as a thread rubber having a rectangular, circular or polygonal cross section, or a string-like one such as a flat rubber can be used. The elastic body 29 is disposed along the circumferential direction of the trunk in the folded composite sheet (elastic sheet) 10 in the third region 33.

When the elastic body 29 is in a natural state in which no tension is applied, the abdominal side portion 16a and the dorsal side portion have a length equal to or greater than the width of each of the abdominal side portion 16a and the back side portion 16b in the natural state. Each 16b is disposed over the entire length along the circumferential direction.
Thereby, in the natural state disposable diaper 2, the wrinkle by the elastic body 29 does not generate | occur | produce in the opening peripheral edge 15 of the waist opening part 7, but it can be set as the clean disposable diaper 2 like the underwear.
Further, by providing the elastic body 29, even if the elasticity of the first sheet 11 on the side of the waist opening 7 is destroyed and loosened at the time of use, the elastic body 29 causes the end on the side of the waist opening 7. Therefore, the disposable diaper 2 having a stable quality can be obtained.
Further, when the disposable diaper 2 is worn, the elastic body 29 is stretched to give the wearer a tightening feeling. Thereby, a feeling of use like underwear can be given to the wearer.

Next, as third to sixth embodiments, examples in which the pattern shape of the adhesive layer is different from that of the first embodiment will be described.
In the above-described embodiment, the adhesive layer has a pattern in which a plurality of adhesive portions that continuously extend in the vertical direction are arranged at equal intervals in the width direction. The layer pattern is not limited to this. As shown in the following embodiments, in the abdominal side portion and the back side portion, a plurality of adhesive portions are arranged at intervals in the circumferential direction, and span the first region 31 and the second region 32. It may be arranged continuously or discontinuously along one direction.
As a result, the plurality of raised portions formed by the second sheet 12 form a series of patterns, and a smooth pattern is formed without interruption in the entire ventral region and the dorsal region.

  The following third to sixth embodiments differ only in that the pattern of the adhesive layer is different from that of the first embodiment, and thus the shape of the pattern formed by the raised portions is different. The explanation will focus on the pattern shape of the layer. In the following third to sixth embodiments, explanation will be given using a plan view showing an unfolded state of the disposable diaper exterior body, and these plan views are all peeled off the side seal part of the disposable diaper shown in FIG. Thus, the abdomen and the dorsal side are separated, and the exterior body is extended along the XY plane. Further, in the plan view of the exterior body, in order to explain the arrangement pattern of the adhesive layer constituting a part of the exterior body, the second sheet is not shown, and only the first sheet and the adhesive layer are illustrated. ing.

<Third Embodiment>
The disposable diaper 3 which concerns on this embodiment is demonstrated using FIG.1 and FIG.9.
The disposable diaper 3 illustrated in FIG. 1 includes an exterior body 38 and an absorber 9. The exterior body 38 shown in FIG. 9 is comprised from the waist part 36 and the crotch part 37 which were formed in a series, and the waist part 36 has the abdominal side part 36a and the back side part 36b. The exterior body 38 includes the first sheet 11 and the second sheet 12 that are bonded together with the adhesive layer 22 interposed therebetween.

  The adhesive layer 22 is disposed between the first sheet 11 and the second sheet 12 and is composed of a plurality of elongated strip-shaped adhesive portions 25 that extend continuously at an equal width in the width direction. The plurality of bonding portions 25 all have the same width and are spaced apart from each other at equal intervals in the vertical direction. The adhesive portions 25 are arranged in a series of patterns over the entire length in the width direction of the abdominal side portion 36a and the back side portion 36b provided with the stretchable region of the exterior body 38.

  In the natural state, the disposable diaper 3 in the present embodiment has a plurality of raised portions formed by the second sheet 12 swelled in the direction away from the first sheet 11 between the adjacent 25 rows of adhesive portions. The raised portions extend in the width direction and are spaced apart at equal intervals in the vertical direction, and form a uniform pattern of wrinkles on the inside of the waist portion 36 of the exterior body 38.

<Fourth Embodiment>
The disposable diaper 4 which concerns on this embodiment is demonstrated using FIG.1 and FIG.10.
The disposable diaper 4 shown in FIG. 1 includes an exterior body 48 and an absorber 9. The exterior body 48 shown in FIG. 10 includes a waist part 46 and a crotch part 47 formed in series, and the waist part 46 has a ventral side part 46a and a back side part 46b. The exterior body 48 includes the first sheet 11 and the second sheet 12 that are bonded together via the adhesive layer 23.

The adhesive layer 23 includes a plurality of adhesive portions 26 disposed between the first sheet 11 and the second sheet 12. The plurality of adhesive portions 26 have an elongated strip shape that continuously extends with an equal width in an oblique direction with respect to the width direction and the vertical direction. The plurality of bonding portions 26 all have the same width and are spaced apart from each other at equal intervals. The bonding portions 26 are arranged in a series of patterns over the entire region of the abdomen side 46a and the entire region of the back side 46b provided with the stretchable region of the exterior body 48.
In the natural state, the disposable diaper 4 has a plurality of raised portions formed by the second sheet 12 swelled in a direction away from the first sheet 11 between adjacent rows of the adhesive portions 26. Each ridge extends diagonally in the circumferential direction and the up-down direction at an equal width, and a plurality of the ridges are arranged at regular intervals.
In the present embodiment, the bonding portion 26 has a shape that extends continuously on a straight line in an oblique direction, but is not limited thereto. For example, an adhesive portion group in which a plurality of adhesive portions are discontinuously arranged on a straight line in an oblique direction may be configured, and a plurality of the adhesive portion groups may be intermittently disposed in the circumferential direction to constitute an adhesive layer. .

<Fifth Embodiment>
The disposable diaper 5 which concerns on this embodiment is demonstrated using FIG.1 and FIG.11.
The disposable diaper 5 shown in FIG. 1 includes an exterior body 58 and an absorbent body 9. The exterior body 58 shown in FIG. 11 is comprised from the waist part 56 and the crotch part 57 which were formed in series, and the waist part 56 has the abdominal side part 56a and the back side part 56b. The exterior body 58 includes the first sheet 11 and the second sheet 12 that are bonded together via the adhesive layer 24.

The adhesive layer 24 is arranged between the first sheet 11 and the second sheet 12 and is composed of a plurality of adhesive portion groups 27 that are arranged at equal intervals in the circumferential direction of the trunk. . Each adhesion part group 27 is comprised from the some adhesion part 27a arrange | positioned intermittently along the up-down direction at equal intervals mutually. In other words, the bonding portion group 27 is configured by disposing a plurality of bonding portions 27a discontinuously on a straight line along the vertical direction.
In the natural state, the disposable diaper 5 in the present embodiment has a plurality of raised portions formed by the second sheet 12 swelled in a direction away from the first sheet 11 between the 27 rows of adjacent adhesive portion groups. Each raised portion is arranged in a matrix.
In the disposable diaper 5, the plurality of raised portions in the abdominal side portion 56a and the back side portion 56b have good air permeability because the hollow portions thereof communicate with each other in space.

<Sixth Embodiment>
The disposable diaper 6 which concerns on this embodiment is demonstrated using FIG.1 and FIG.12.
The disposable diaper 6 shown in FIG. 1 includes an exterior body 68 and an absorber 9. The exterior body 68 shown in FIG. 12 is comprised from the waist part 66 and the crotch part 67 which were formed in series, and the waist part 66 has the abdominal side part 66a and the back side part 66b. The exterior body 68 includes a first sheet 11 and a second sheet 12 that are bonded together via an adhesive layer 63.

The adhesive layer 63 includes a plurality of adhesive portions 64 arranged in a staggered manner between the first sheet 11 and the second sheet 12. The plurality of bonding portions 64 are intermittently arranged with a space therebetween in the circumferential direction of the body, and are also intermittently disposed with a space in the vertical direction. The plurality of bonding portions 64 are discontinuously arranged along the vertical direction. Here, the zigzag pattern refers to an arrangement in which the adhering portions are staggered between adjacent adhering portion groups in which a plurality of adjacent adhering portions 64 are discontinuously arranged along the vertical direction.
The disposable diaper 6 has a plurality of raised portions formed by the second sheet 12 swelled in a direction away from the first sheet 11 between the adjacent adhesive portions 64 in a natural state. The plurality of raised portions are arranged in a staggered manner.
The disposable diaper 6 is provided with a plurality of raised portions almost uniformly in both the width direction and the vertical direction in the entire region of the abdominal side portion 66a and the back side portion 66b, so that there is a cushion feeling and the exterior body 68 has a soft impression. It can be.

In the above-described embodiments, some examples of the pattern of the adhesive layer have been described. However, the present invention is not limited to these patterns. For example, in the first, fourth, fifth, and sixth embodiments, there is an adhesive portion group in which a plurality of adhesive portions are arranged in a discontinuous manner or an adhesive portion that extends continuously in an up-down direction or an oblique direction. An example in which they are arranged at equal intervals in the circumferential direction has been given.
On the other hand, you may arrange | position the adhesion part or adhesion part group extended along an up-down direction or the diagonal direction at the arrangement | positioning space | interval which differs in the circumferential direction. For example, in each of the back side part and the abdominal side part constituting the waist part, the arrangement interval of the adhesion part or the adhesion part group arranged on both side parts in the width direction close to the side seal part is arranged in the center part in the width direction. You may make narrower than the arrangement | positioning space | interval width | variety of the adhesion part or adhesion part group. Further, the arrangement interval may be changed stepwise or continuously narrowing from the central portion of the back side portion and the abdominal side portion toward both side portions.
Thus, even if the arrangement interval of the bonding portions in the width direction is changed and arranged intermittently, the arrangement pattern of the bonding portions in the high shrinkage stress region P1 and the low shrinkage stress region P2 arranged along the vertical direction. Therefore, the plurality of raised portions formed by the second sheet form a series of patterns over the high shrinkage stress region P1 and the low shrinkage stress region P2.
As a result, a smooth pattern is formed seamlessly from the high contraction stress region P1 to the low contraction stress region P2 in the entire region of the ventral region and the back region.

<Seventh Embodiment>
In the first embodiment, an example in which the first sheet 11 having the high shrinkage stress region P1 and the low shrinkage stress region P2 is configured by changing the thickness of the elastic fiber constituting the elastic resin has been described. However, the present invention is not limited to this.
For example, the arrangement interval of the elastic filaments may be varied.
In the first sheet 50 shown in FIG. 13, the elastic filament 62 constituting the elastic resin is used in both the first region 31 that is the high shrinkage stress region P1 and the second region 32 that is the low shrinkage stress region P2. The elastic fibers have the same thickness, for example, elastic fibers having a thickness of 100 μm here. The plurality of elastic filaments 62a used in the first region 31 and the plurality of elastic filaments 62b used in the second region 32 extend along the circumferential direction and are spaced apart from each other in the vertical direction. . The arrangement interval of the elastic filaments 62 a in the first region 31 is narrower than the arrangement interval of the elastic filaments 62 b in the second region 32. Thereby, the shrinkage stress of the first region 31 can be made higher than that of the second region 32.
The arrangement interval of the elastic filaments 62a arranged in the first region 31 is preferably 0.2 mm or more, more preferably 0.5 mm or more, and preferably 2.5 mm or less, more preferably 2 mm or less, and The thickness is preferably 0.2 mm or more and 2.5 mm or less, more preferably 0.5 mm or more and 2 mm or less.
The arrangement interval of the elastic filaments 62b arranged in the second region 32 is preferably 0.5 mm or more, more preferably 0.8 mm or more, and preferably 5.0 mm or less, more preferably 3.0 mm or less. And preferably it is 0.5 mm or more and 5.0 mm or less, More preferably, it is 0.8 mm or more and 3.0 mm or less.
The arrangement interval of the elastic filaments 62b arranged in the second region 32 is preferably 1.2 times or more, more preferably 1.5 times or more of the arrangement interval of the elastic filaments 62a arranged in the first region 31. Moreover, it is preferably 3 times or less, more preferably 2.5 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.5 times or more and 2.5 times or less.

Alternatively, by making the weight of the elastic resin per unit area of the first region 31 higher than that of the second region 32, the contraction stress of the first region 31 can be made higher than that of the second region 32. Good.
The weight per unit area of the elastic resin disposed in the first region 31 is preferably 5 g / m ² or more, more preferably 7 g / m ² or more, and preferably 15 g / m ² or less, more preferably 12 g. / M ² or less, and preferably 5 g / m ² or more and 15 g / m ² or less, more preferably 7 g / m ² or more and 12 g / m ² or less.
The weight per unit area of the elastic resin disposed in the second region 32 is preferably 4 g / m ² or more, more preferably 5 g / m ² or more, and preferably 12 g / m ² or less, more preferably 10 g. / M ² or less, and preferably 4 g / m ² or more and 12 g / m ² or less, more preferably 5 g / m ² or more and 10 g / m ² or less.
The weight per unit area of the elastic resin used in the first region 31 is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 3 times or less than that of the second region 32. It is preferably 2.5 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.5 times or more and 2.5 times or less.

Alternatively, by making the density of the plurality of elastic fibers constituting the elastic resin in the first region 31 higher than that in the second region 32, the contraction stress in the first region 31 is made higher than that in the second region 32. May be.
The density of the plurality of elastic fibers constituting the elastic resin used in the first region 31 is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 3 times that of the second region 32. Hereinafter, it is more preferably 2.5 times or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.5 times or more and 2.5 times or less.

<Still another embodiment>
The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the adhesive layer is provided so that the raised portions form a series of patterns. However, when the exterior body is manufactured, the first sheet is stretched at a constant stretch rate to generate the second sheet. The sheets may be bonded together, and the adhesive layer may not be provided so that the raised portions are formed in a series of patterns. By producing the exterior body by stretching the first sheet at a constant elongation rate and bonding it to the second sheet, it is like underwear underwear with a uniform texture over a plurality of regions where the shrinkage stress of the exterior body is different Disposable diapers with appearance and feel can be obtained.

Moreover, in the above-mentioned embodiment, although the exterior body was comprised using the 1st sheet | seat and the 2nd sheet | seat, you may comprise an exterior body only with a 1st sheet | seat (elastic sheet), and it is constant. What is necessary is just to form and bond a side seal part in the state which extended the abdominal part and the back | dorsal part by the expansion | extension rate of.
Moreover, in the above-mentioned embodiment, although both the abdominal side part and the back side part of the waist part had the expansion-contraction area | region, you may make it at least one of a ventral side part or a back side part have an expansion-contraction area | region. .
In addition, a laminated sheet in which a first sheet (expandable sheet) and a second sheet (non-stretchable sheet) are stacked is used for the waist portion of the exterior body of the above-described embodiment, and when applied to a disposable diaper The first sheet, which is a stretchable sheet, is disposed on the outer surface side, and the second sheet is disposed on the inner surface side. However, the first sheet is disposed on the inner surface side, and the second sheet is disposed on the outer surface side. May be. In such a configuration, a raised portion is formed on the outer surface of the disposable diaper, but since the plurality of raised portions form a series of patterns, the waist portion of the disposable diaper is generally a uniform fabric. The appearance and feel of an underwear pant having a uniform texture such as

Further, in the above-described embodiment, an example in which the folded portion where the first sheet is folded is provided at the opening peripheral edge of the waist opening portion, but the folded portion may not be provided. In this case, the exterior body is composed of a composite sheet obtained by laminating a first sheet (elastic sheet) and a second sheet (non-elastic sheet) having the same external shape. Note that even when the exterior body is configured by only the first sheet, the folded portion may or may not be provided.
When the folded portion is not provided, for example, when the adhesive layer pattern as in the first, fourth, fifth, and sixth embodiments is used, the raised portion is at the peripheral edge of the opening of the waist opening together with the first sheet. Form an opening. Thereby, the air flowing inside the raised portion having a hollow shape can easily flow to the outside of the disposable diaper via the opening formed by the raised portion, and the air permeability is further improved.

  Moreover, in each above-mentioned embodiment, it is good also as a non-stretching area | region by cutting or removing a part of elastic element of the elastic sheet of the area | region facing the absorber of a waist part. Thereby, shrinkage | contraction of an elastic sheet does not act on an absorber and a wrinkle arises in an absorber, and the liquid absorption performance of an absorber is not inhibited.

  Moreover, the underpants type absorbent article which concerns on this invention may not be the underpants type disposable diaper previously formed in the underpants shape by joining by the side seal part like the said embodiment. That is, the pant-type absorbent article according to the present invention is a tape-type disposable diaper that is provided with a tape such as a hook-and-loop fastener instead of the side seal part, and becomes a pant shape by attaching the tape together when worn. Also good.

  Furthermore, the pants-type absorbent article according to the present invention may not be a disposable diaper for infants, and may be a disposable diaper for adults or children, for example. Furthermore, the pants-type absorbent article according to the present invention may not be a disposable diaper as long as it is an absorbent article of the type worn on the lower body. Examples of such a pants-type absorbent article include a pants-type sanitary napkin and a pants-type urine leak pad.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
An absorptive body located in the crotch, a waist part having an abdominal part and a dorsal part located around the waist, and located between the abdominal part and the dorsal part, the abdominal part and the dorsal part And a pants-type absorbent article having a crotch portion for holding the absorbent body,
Expansion and contraction in which at least one of the ventral side portion and the dorsal side portion includes a first region and a second region located above the first region in the vertical direction perpendicular to the circumferential direction of the trunk. Composed of sheets,
The elastic sheet is configured to include an elastic resin and a non-woven fabric layer containing the elastic resin, and the first region and the second region have mutually different circumferential contraction stresses. A pants-type absorbent article in which the dimension in the circumferential direction in the natural state is the same in the region of the second region and the second region.
<2>
The elastic sheet is
A first sheet composed of the nonwoven fabric layer containing the elastic resin;
A second sheet comprising a non-stretchable nonwoven fabric facing the first sheet;
The underpants-type absorbent article according to <1>, further comprising: an adhesive layer that bonds the first sheet and the second sheet.
<3>
The second sheet has a plurality of ridges protruding on the opposite side of the first sheet, and the ridges form a series of patterns;
The pants-type absorbent article according to <2>, wherein the adhesive layer is disposed across the first region and the second region.
<4>
The adhesive layer includes a plurality of adhesive portions that are arranged at intervals in the circumferential direction and are arranged continuously or discontinuously along one direction across the first region and the second region. The pants-type absorbent article according to <3>.
<5>
The plurality of adhesive portions are arranged continuously or discontinuously along the up-down direction. The pant-type absorbent article according to <4>.
<6>
The plurality of adhesive portions are arranged in a staggered pattern. The pant-type absorbent article according to <4>.
<7>
The pants-type absorbent article according to <1>, wherein the stretchable sheet is composed of one first sheet composed of the nonwoven fabric layer containing the elastic resin.
<8>
The pants-type absorbent article according to any one of <1> to <7>, wherein the contraction stress in the first region is higher than that in the second region.
<9>
The weight of the elastic resin per unit area of the first region is heavier than that of the second region. The pant-type absorbent article according to any one of <1> to <8>.
<10>
The elastic resin is composed of a plurality of elastic fibers,
The pants-type absorbent article according to any one of <1> to <8>, wherein the density of the plurality of elastic fibers in the first region is higher than that of the second region.
<11>
The elastic resin is composed of a plurality of elastic fibers,
The pants-type absorbent article according to any one of <1> to <8>, wherein the plurality of elastic fibers in the first region are thicker than the second region.
<12>
The elastic resin is composed of elastic filaments that are continuous in a plurality of stretch directions,
The plurality of elastic filaments are arranged at intervals in the vertical direction along the circumferential direction,
The pants-type absorbent article according to any one of <1> to <8>, wherein an interval between the plurality of elastic filaments in the first region is narrower than that in the second region.
<13>
The thickness of the plurality of elastic filaments is the same in the first region and the second region. The pant-type absorbent article according to <12>.
<14>
The elastic sheet further includes a third region located at the upper edge in the vertical direction, and the elastic sheet folded back toward the lower side in the vertical direction,
The shrinkage stress in the circumferential direction of the third region is the same as or lower than that of the first region and higher than that of the second region. Any one of <1> to <13> The pants-type absorbent article described in 1.
<15>
The length of the 3rd field in the up-and-down direction is 1/2 or less of the 2nd field. The underpants type absorptive article given in the above <14>.
<16>
The pant-type absorbent article is
The pants-type absorbent article according to <14> or <15>, further including an elastic body arranged along the circumferential direction in the folded elastic sheet in the third region.
<17>
The shrinkage stress in the first region is preferably 1.4 cN / mm or more, more preferably 2 cN / mm or more, and preferably 5 cN / mm or less, and preferably 1.4 cN / mm or more and 5 cN / mm. The pant-type absorbent article according to any one of <1> to <16>, which is 2 mm or less, more preferably 2 cN / mm or more and 5 cN / mm or less.
<18>
The shrinkage stress of the second region is preferably 0.1 cN / mm or more, more preferably 0.5 cN / mm or more, preferably 3 cN / mm or less, more preferably 2.5 cN / mm or less, And it is preferably 0.1 cN / mm or more and 3 cN / mm or less, more preferably 0.5 cN / mm or more and 2.5 cN / mm or less. Any one of <1> to <17> Pants-type absorbent article.
<19>
The shrinkage stress in the third region is preferably 1.4 cN / mm or more, more preferably 1.5 cN / mm or more, preferably 4 cN / mm or less, more preferably 3.5 cN / mm or less, and Preferably, it is 1.4 cN / mm or more and 4 cN / mm or less, More preferably, it is 1.5 cN / mm or more and 3.5 cN / mm or less, The pants type | mold as described in any one of said <14> to <16> Absorbent article.
<20>
The shrinkage stress of the first region is preferably 1.2 times or more, more preferably 1.4 times or more, preferably 3 times or less, more preferably 2.5 times the shrinkage stress of the second region. Or less, and preferably 1.2 times or more and 3 times or less, more preferably 1.4 times or more and 2.5 times or less, according to any one of the above items <1> to <19> Pants-type absorbent article.
<21>
The shrinkage stress in the first region is preferably 1.1 times or more, more preferably 1.5 times or more, and preferably 2.5 times or less, more preferably 2 times that of the third region. Any one of the above <14> to <16>, <19>, preferably 1.1 times to 2.5 times, more preferably 1.5 times to 2 times The pants-type absorbent article described in 1.
<22>
The length of the first region in the vertical direction is preferably 1.0 times or more, more preferably 1.2 times or more, and preferably 2 times or less, more preferably the length of the second region. 1.8 times or less, and preferably 1.0 times or more and 2 times or less, more preferably 1.2 times or more and 1.8 times or less, and any one of <1> to <21> The pants-type absorbent article described in 1.
<23>
The length of the third region in the vertical direction is preferably 0.5 cm or more, 5 cm or less, more preferably 3 cm or less, still more preferably 1.5 cm or less, and preferably 0.5 cm or more and 5 cm. Or less, more preferably 0.5 cm or more and 3 cm or less, and further preferably 0.5 to 1.5 cm or less, according to any one of <14> to <16>, <19>, <21>. Pants-type absorbent article.
<24>
The elastic body is in a natural state where no tension is applied, and has a length equal to or greater than the width along the circumferential direction of each of the abdomen and the dorsal side in the natural state, and the abdomen and the dorsal side. The underpants-type absorbent article according to <16>, wherein the pants-type absorbent article is disposed on each side part over the entire length along the circumferential direction.

1, 2, 3, 4, 5, 6 ... disposable diapers (pants-type absorbent articles)
8, 28, 38, 48, 58, 68 ... exterior body 9 ... absorbent body 10 ... composite sheet (expandable sheet)
11, 50 ... 1st sheet (elastic sheet)
16 ... Waist portions 16a, 36a, 46a, 56a, 66a ... Abdominal side portions 16b, 36b, 46b, 56b, 66b ... Back side portions 17, 37, 47, 57, 67 ... Crotch portion 31 ... First region 32 ... Second region 42, 62 ... elastic filament (elastic resin)

Claims (15)

An absorptive body located in the crotch, a waist part having an abdominal part and a dorsal part located around the waist, and located between the abdominal part and the dorsal part, the abdominal part and the dorsal part And a pants-type absorbent article having a crotch portion for holding the absorbent body,
Expansion and contraction in which at least one of the ventral side portion and the dorsal side portion includes a first region and a second region located above the first region in the vertical direction perpendicular to the circumferential direction of the trunk. Composed of sheets,
The elastic sheet is configured to include an elastic resin and a non-woven fabric layer containing the elastic resin, and the first region and the second region have mutually different circumferential contraction stresses. A pants-type absorbent article in which the dimension in the circumferential direction in the natural state is the same in the region of the second region and the second region. The elastic sheet is
A first sheet composed of the nonwoven fabric layer containing the elastic resin;
A second sheet comprising a non-stretchable nonwoven fabric facing the first sheet;
The pants-type absorbent article according to claim 1, further comprising: an adhesive layer that adheres the first sheet and the second sheet. The second sheet has a plurality of ridges protruding on the opposite side of the first sheet, and the ridges form a series of patterns;
The pants-type absorbent article according to claim 2, wherein the adhesive layer is disposed across the first region and the second region. The adhesive layer includes a plurality of adhesive portions that are arranged at intervals in the circumferential direction and are arranged continuously or discontinuously along one direction across the first region and the second region. The underpants type absorbent article according to claim 3. The pants-type absorbent article according to claim 4, wherein the plurality of adhesive portions are arranged continuously or discontinuously along the vertical direction. The pants-type absorbent article according to claim 4, wherein the plurality of adhesive portions are arranged in a staggered pattern. The pants-type absorbent article according to any one of claims 1 to 6, wherein the contraction stress in the first region is higher than that of the second region. The pants-type absorbent article according to any one of claims 1 to 7, wherein a weight of the elastic resin per unit area of the first region is heavier than that of the second region. The elastic resin is composed of a plurality of elastic fibers,
The pants-type absorbent article according to any one of claims 1 to 7, wherein a density of the plurality of elastic fibers in the first region is higher than that of the second region. The elastic resin is composed of a plurality of elastic fibers,
The pants-type absorbent article according to any one of claims 1 to 7, wherein a thickness of the plurality of elastic fibers in the first region is thicker than that of the second region. The elastic resin is composed of elastic filaments that are continuous in a plurality of stretch directions,
The plurality of elastic filaments are arranged at intervals in the vertical direction along the circumferential direction,
The pants-type absorbent article according to any one of claims 1 to 7, wherein an interval between the plurality of elastic filaments in the first region is narrower than that in the second region. The pants-type absorbent article according to claim 11, wherein the thickness of the plurality of elastic filaments is the same in the first region and the second region. The elastic sheet further includes a third region located at the upper edge in the vertical direction, and the elastic sheet folded back toward the lower side in the vertical direction,
The contraction stress in the circumferential direction of the third region is the same as or lower than that of the first region, and is higher than that of the second region. The underpants type absorbent article as described. The pants-type absorbent article according to claim 13, wherein a length of the third region in the vertical direction is not more than ½ of the second region. The pants-type absorbent article according to claim 13 or 14, further comprising an elastic body disposed along the circumferential direction in the stretchable sheet folded back in the third region.

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