WO2009084643A1

WO2009084643A1 - Pants type disposable diaper

Info

Publication number: WO2009084643A1
Application number: PCT/JP2008/073764
Authority: WO
Inventors: Takeshi Ihata; Yosuke Mori
Original assignee: Daio Paper Corporation
Priority date: 2007-12-28
Filing date: 2008-12-26
Publication date: 2009-07-09
Also published as: KR20100112595A; CN101909568A; CN101909568B; KR101478864B1

Abstract

A pants type disposable diaper in which side seal sections simultaneously achieve both sufficient seal strength and ease of separation. In the pants type disposable diaper, a belly-side exterior sheet (12F) and a rear-side exterior sheet (12B) are separated from each other without being connected to each other on the crotch side. The exterior sheets (12F, 12B) have a waist-side folded back portion (21) and a crotch-side folded back portion (22). The crotch-side edge of the waist-side folded back portion (21) and the waist-side edge of the crotch-side folded back portion (22) agree with each other. The number of plies in that portion of a sheet-like air permeable material (12) which is at a waist-side end and the number of plies in that portion of the sheet-like air permeable material (12) which is at a crotch-side end are the same. Further, the number of plies in that portion of the sheet-like air permeable material (12) which is at an intermediate section between the waist-side end and the crotch-side end is the same as or less than the number of plies in those portions of the sheet-like air permeable material (12) which are at the waist-side end and the crotch-side end.

Description

Pants-type disposable diaper

The present invention relates to a pants-type disposable diaper.

The pants-type disposable diaper has an absorbent body interposed between the liquid-permeable top sheet and the back sheet, has leg gathers on both sides, and covers from the back side through the crotch part to the abdomen side. And an exterior sheet attached to the outer surface of the interior body so as to cover the waistline and the crotch, and both sides of the back side portion and both sides of the abdominal side portion of the exterior sheet, Are often joined by heat sealing to form a side seal portion, and a waist opening and a leg opening are formed in advance in a pants-type structure (see Patent Documents 1 to 8).
In such a pants-type disposable diaper, for example, as shown in FIG. 25, the

exterior sheets

12F and 12B are formed by laminating a plurality of layers of sheet-like

breathable materials

12, 21, and 22 in order to improve the fit to the body. In addition, a structure is widely adopted in which elastic elastic members 15 to 19 such as rubber thread are sandwiched and fixed between the sheet-like

breathable materials

12, 21, and 22 along the width direction. In general, the lamination of the sheet-like breathable material is performed by bonding with an adhesive such as a hot-melt adhesive, or welding by heat sealing or ultrasonic sealing.
Also, when removing the diaper after excretion, etc., the back seal part and the ventral part of the side seal part are peeled off and removed from the body, so the side seal part has a seal strength that does not break during wearing In addition to the demand for ease of peeling after use, various techniques have been proposed.
JP 2000-316898 A JP 2003-38573 A Japanese Patent No. 3507479 Japanese Patent No. 3508044 Japanese Patent No. 3706553 Japanese Patent No. 3737709 Japanese Patent No. 3749855 Japanese Patent No. 3781534

However, the conventional underpants-type disposable diaper has been deteriorated in air permeability and flexibility due to the fact that the entire exterior sheet is formed by bonding sheet-like breathable materials.
Further, the side seal part is a part formed by laminating a plurality of sheet-like materials such as non-woven fabrics, and the number of laminations of the sheet-like material is different between the waist side end part and the crotch side end part of the side seal part. Therefore, there has been a problem that either one of the welds becomes too strong and peeling becomes difficult, or one of the welds becomes too weak to cause unintended peeling during use.
For example, as shown in FIG. 25, in a conventional pants-type paper diaper, for the purpose of improving the touch and the like, the waist-side end portion of the outermost sheet-like material 12 is folded back to the innermost surface side, In this case, the number of stacked sheet-like materials 12 in the upper portion of the side seal portion (upper portion in FIG. 25 (b)) is the sheet-like material in the lower portion. Therefore, the upper portion of the side seal portion is relatively strongly welded. In other words, if the upper part of the side seal part is manufactured so that it is properly welded, the lower part is not sufficiently welded, and the seal may be peeled off due to the strong force applied around the legs. When it is manufactured so that the upper part is strongly welded and peeling after use becomes almost impossible, it is extremely difficult to set appropriate conditions.
Furthermore, such a problem is difficult to solve by changing the welding pattern as described in the above-mentioned patent documents.
Then, the main subject of this invention is improving air permeability and a softness | flexibility, suppressing the fall of fit property in an exterior sheet | seat. Another problem is to make both the side seal part secure sufficient sealing strength and ease of peeling, and improve the feel to improve the feeling of wearing.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A cylindrical waistline formed by joining both sides of the ventral exterior sheet and both sides of the back exterior sheet;
An interior body that absorbs excrement, provided from the center in the width direction of the inner surface of the ventral exterior sheet to the center in the width direction of the inner surface of the back exterior sheet,
In the pants-type disposable diaper in which the ventral side exterior sheet and the back side exterior sheet are not continuous on the crotch side and are separated from each other,
The belly side exterior sheet and the back side exterior sheet have a waist side end, a waistline upper end, a waistline middle part, and a waistline lower end in order from the top in the same vertical range as the side seal part to be joined. And
At least one of the abdominal exterior sheet and the back exterior sheet; the waist side end portion and the waistline lower end portion are formed by bonding together a plurality of layers of sheet-like breathable materials, and between the sheet-like breathable materials The elastic elastic member is clamped and fixed in a state of being stretched along the width direction, and at least one of the upper part of the waistline and the middle part of the waistline is made of a single-layer sheet-like breathable material. Does not have adhesive to fix,

A pants-type disposable diaper characterized by that.
(Function and effect)
In the present invention, at least one of the abdominal exterior sheet and the back exterior sheet has at least one of the upper part of the waistline and the middle part of the waistline made of a single-layer sheet-like air-permeable material, Therefore, the air permeability and flexibility are improved. Moreover, the waist-side end portion and the waistline lower end portion of at least one of the abdominal-side exterior sheet and the back-side exterior sheet are formed by laminating a plurality of layers of sheet-like breathable materials and between the sheet-like breathable materials. Since the elastic stretchable member is clamped and fixed in a state of being stretched along the width direction, it is possible to sufficiently secure the fit around the waist and the legs around the pants-type disposable diaper.

<Invention of Claim 2>
The waist-side end portion and the waistline lower end portion of the abdominal-side exterior sheet and the back-side exterior sheet are formed by laminating a plurality of layers of sheet-like breathable materials, and an elastic stretch member is provided between the sheet-like breathable materials. It is clamped and fixed in a stretched state along the width direction,

The waistline upper end portion of the ventral exterior sheet and the waistline middle portion of the backside exterior sheet are made of a single-layer sheet-like breathable material, and have an elastic stretch member and an adhesive for fixing the elastic stretch member. The underpants type disposable diaper of Claim 1 which is not.
(Function and effect)
In this case, the upper part of the waistline of the abdominal exterior sheet and the middle part of the waistline of the backside exterior sheet are made of a single-layer sheet-like breathable material, and do not have an elastic stretch member and an adhesive for fixing the elastic stretch member. Therefore, it becomes excellent in air permeability and flexibility. Moreover, the waist-side end and the waistline lower end of the abdominal exterior sheet and the back exterior sheet are formed by laminating a plurality of layers of sheet-like breathable materials, and an elastic elastic member is provided between these sheet-like breathable materials. Since it is clamped and fixed in the state extended | stretched along the width direction, it can fully ensure about the waist | circumference fit around a waist | leg and leg | leg circumference which are the minimum required in a pants-type disposable diaper.

<Invention of Claim 3>
The back-side exterior sheet has a back-side extension portion that extends downward in the same vertical range as the side seal portion, and the back-side extension portion overlaps the interior body in the width direction center. Part and a buttock cover part extending on both sides thereof, and the back extension part is formed by bonding a plurality of layers of sheet-like breathable materials and between the sheet-like breathable materials. The elastic elastic member is sandwiched and fixed in at least the buttocks cover part in a state extending in the width direction, and the contraction force in the width direction at the lower end of the waistline of the belly side exterior sheet is applied to the back side exterior sheet. The pants-type disposable diaper according to claim 2, wherein the pants-type disposable diaper is stronger than the contraction force in the width direction at the lower end of the waistline and the back extension part.
(Function and effect)
When the back side exterior sheet is provided with a back side extending part that extends below the side seal part, both side parts on the lower side of the buttock are covered by the buttock cover part that is a part on both sides of this part. Is preferable. Further, in this case, it is preferable that the elastic stretchable member is provided in the buttock cover portion in a state of being stretched along the width direction so that the both side portions of the extension portion do not rip off.

However, when the elastic cover is provided on the buttock cover, the balance of contraction force between the abdomen and the dorsal side with the side seal part as a boundary is lost, and the contraction force toward the back side acts more strongly on the lower end side of the side seal part. As shown in FIG. 27, during use, a phenomenon occurs in which the side seal portion 12A of the back side exterior sheet 12B and the abdominal side exterior sheet 12F is shifted to the back side toward the lower end side. There is a risk of swelling or wobbling in the buttock cover. Therefore, it is preferable to prevent the collar cover portion from curling up and bulging as shown in FIG. 26 by configuring as in the invention described in this section.

<Invention of Claim 4>
The waistline middle part of the ventral exterior sheet and the waistline upper end part of the backside exterior sheet are formed by laminating a plurality of layers of sheet-like breathable materials and elastic elastic members between the sheet-like breathable materials The underpants-type disposable diaper according to claim 3, wherein the pants-type disposable diaper is clamped and fixed while being stretched along the width direction.
(Function and effect)
In the structure where the entire middle part of the waistline and the upper end part of the waistline or almost the whole is made of a single-layer sheet-like breathable material, and does not have an elastic elastic member and an adhesive for fixing it, the breathability and flexibility However, the fit of the waistline is lowered, and the waistline becomes loose easily. On the other hand, as described in this section, in the ventral exterior sheet, the middle part of the waistline is a part having a plurality of layers, elastic elastic members and adhesives, and the upper end part of the waistline does not have elastic elastic members and adhesives. On the other hand, in the backside exterior sheet, the middle part of the waistline is a part that does not have the elastic elastic member and the adhesive, and the upper part of the waistline is a part that has a plurality of layers, the elastic elastic member and the adhesive. As a result, the flexibility and breathability are further improved, and the fit around the waist is not easily lowered, and the waist is less likely to bump.

<Invention of Claim 5>
The waistline middle part of the ventral exterior sheet and the waistline upper end part of the backside exterior sheet are made of a single-layer sheet-like breathable material, and have an elastic stretch member and an adhesive for fixing the elastic stretch member. The underpants type disposable diaper of Claim 3 which is not.
(Function and effect)
Further, the waistline middle part of the abdominal exterior sheet and the waistline upper end part of the backside exterior sheet are also made of a single-layer sheet-like breathable material and do not have an elastic stretch member and an adhesive for fixing the elastic stretch member. By adopting a structure, the air permeability and flexibility are further improved.

<Invention of Claim 6>
The underpants type disposable diaper of Claim 3 whose side seal part inclination | tilt angle in a side seal part inclination test is 20 degrees or less.
(Function and effect)
By configuring the joint inclination angle in the joint inclination test to be 20 degrees or less, it is possible to effectively prevent the ridge and bulge in the buttock cover part. The side seal portion inclination test measures the inclination angle of the side seal portion as follows. That is, first, as shown in FIG. 28 (a), only the waistline portion 12 from which the absorbent main body is removed from the paper diaper is prepared as a specimen, and this specimen 12 is the center line in the product width direction of the ventral-side exterior sheet 12F. And the center line of the product width direction of the back side exterior sheet 12B is folded so that the inner surfaces overlap each other, and the base end line L1 of both side seal portions 12A (the edge of the side seal portion 12A on the center side in the width direction) Try to stack. Next, the specimen 12 in the folded state is sandwiched by one chuck C1 of the tensile tester over the entire product vertical direction from the one fold line to the side seal part side, and from the other fold line to the side seal part side. A range of 10 mm is sandwiched by the other chuck C2 of the tensile tester over the entire product vertical direction, and a tensile test is performed along the product belly and back direction indicated by the arrow. The distance between chucks (the length during natural contraction) when the specimen 12 is naturally contracted without being pulled is defined as A, and the distance between chucks when the specimen 12 is stretched without contraction by the elastic elastic member (at the time of maximum extension). When the length is B, the upper and lower ends of the side seal base line L1 with respect to the product vertical direction when the distance between the chucks is (A + B) / 2 as shown in FIG. Is measured using a protractor, and this is defined as a side seal portion inclination angle.
The contraction force is a stress applied to a certain width (length in the front-rear direction) of the sheet when the sheet is pulled in the product width direction, and is measured as follows. That is, first, a region to be measured is cut from the waistline portion 12 to be a specimen, and one end of the specimen in the product width direction is sandwiched by one chuck C1 of the tensile tester, and the other end is clamped by the other chuck C2. A tensile test is performed along the product width direction. The distance between chucks (the length during natural contraction) when the specimen is naturally contracted without being pulled is defined as A, and the distance between chucks (the maximum length when stretched) when the specimen is pulled until it is not contracted by the elastic elastic member. ) Is B, the stress applied between the chucks when the chuck is pulled so that the distance between the chucks is (A + B) / 2 is measured, and this is divided by the length in the front-rear direction of the specimen. (N / 10 mm).

<Invention of Claim 7>
The underpants type disposable diaper of Claim 2 comprised so that the edge of the front-end part of the said interior body and a rear-end part may not contain the sheet | seat material which consists of a film material or a paper material.
(Function and effect)
By configuring as described in this section, the edges of the front and rear ends of the interior body are thin and soft, and the air permeability is excellent. Therefore, if combined with the configuration covering the front and rear end portions of the interior body, it is possible to further improve the feeling of wearing, and even if it is exposed to the inner surface side without being covered, the wearing feeling is deteriorated. Can be suppressed.

<Invention of Claim 8>
Of the side seal part, which is a part where both side parts of the abdominal side exterior sheet and both side parts of the back side exterior sheet are welded and joined, the number of sheet-like materials laminated at the waist side end part and the sheet form at the crotch side end part The number of laminated materials is the same, and the number of laminated sheet-like materials at the intermediate portion between the waist-side end portion and the crotch-side end portion is the sheet-like material at the waist-side end portion and the crotch-side end portion. The pants-type disposable diaper according to claim 2, wherein the number is equal to or less than the number of laminated layers.
(Function and effect)
In order to achieve both sufficient sealing strength of the side seal portion and ease of peeling, it is possible to simply adjust the number of laminated sheet-like materials on the exterior sheet. However, there are various restrictions on the laminated structure of the sheet-like material in the exterior sheet. For example, if the edge of the sheet-like material is exposed at the edge that contacts the skin, such as the edge of the waist opening of the exterior sheet or the edge of the leg opening, the sheet may be easily peeled off or the touch may deteriorate. In order to improve the above, when the end on the waist side of the sheet-like material located on the outermost side is folded back to the innermost side and the edge of the sheet-like material is covered, the restriction is imposed. Further, when an elastic elastic member such as rubber thread is sandwiched and fixed between the sheet-like materials, the laminated structure of the sheet-like material is restricted by the arrangement of the elastic elastic members. Therefore, simply adjusting the number of sheet-like materials stacked on the exterior sheet may impair other functions.
On the other hand, in the present invention, the number of sheet-like materials stacked in the side seal portion is the same in the waist side end portion and the crotch side end portion, and in the intermediate portion between them, the waist side end portion and the crotch side By having the same number or less as the end portion, it is possible to obtain the same joint strength at the waist side end portion and the crotch side end portion by forming the side seal portion evenly, and at the intermediate portion, the same or less Weaker bonding strength can be obtained. Therefore, there is no unintentional peeling during wearing and use at the waist side end and crotch side end of the side seal part, which is a part where particularly strong force is applied during wearing and which is the starting point or end point of peeling. If the side seal part is formed so as to have an appropriate joining strength that is easy to peel off later, smooth peeling is required for peeling after use (it is not preferable to be stronger than the starting point and end point). Since the strength is equal to or less than that, the entire side seal portion is not unintentionally peeled off during mounting, and is easily peeled off after use.
Moreover, in the present invention, the abdominal exterior sheet and the back exterior sheet are separated without being continuous, and in each exterior sheet, the waist side end part and the crotch side end part have the same folded structure, and the waist side folded part and By adopting a structure in which the crotch-side folded portions do not overlap each other, it is easy to make the number of sheet-like materials stacked in each part described above, and even in such a case, the edge of the sheet-like material of each exterior sheet Can be prevented from being exposed to the edge of the exterior sheet, and an elastic elastic member can be sandwiched and fixed to the folded portion as will be described later. Therefore, according to the present invention, it is possible to achieve both sufficient sealing strength and ease of peeling without impairing other functions.
The abdominal exterior sheet and the back exterior sheet are formed so that the sheet-like material forming the outermost surface is folded back so as to cover from the waist side edge of the innermost surface to the crotch side edge or the vicinity thereof at the waist side edge. In this case, at the crotch side edge of each exterior sheet, the edge of the sheet-like material of each exterior sheet is exposed, but the waist side where peeling and deterioration of the touch are particularly likely to occur. At the edge, it is not necessary to expose the edge of the sheet-like material of each exterior sheet. Therefore, an operation effect substantially equivalent to the above-mentioned form is produced.

<Invention of Claim 9>
The pants-type disposable diaper according to claim 8, wherein the welding is performed by ultrasonic welding.
(Function and effect)
The effect of the number of sheet-like material layers as described above is significant when the welded portion is formed by ultrasonic welding. Therefore, the present invention is suitable for such a case.

<Invention of Claim 10>
The pants-type disposable diaper according to claim 9, wherein the side seal portion is formed in a line shape from an upper edge to a lower edge of a portion where both side portions of the ventral side exterior sheet and both side portions of the back side exterior sheet overlap. .
(Function and effect)
The present invention is particularly suitable for the side seal portion as described in this section.

As described above, according to the present invention, sufficient sealing strength can be ensured and easy to peel off, sufficient sealing strength can be ensured and easy to peel off, and the touch can be improved. This provides the advantage that the feeling of wearing can be improved.

Hereinafter, various forms of the pants-type disposable diaper will be described in detail with reference to the accompanying drawings. In the following description, “front-rear direction” means a direction connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left-right direction) orthogonal to the front-rear direction. In addition, the “vertical direction” means the wearing state of the diaper, that is, the direction perpendicular to the waistline direction when the diaper is folded in two at the crotch so that both the front body side and the back body side of the diaper are overlapped, In other words, it means the direction connecting the waist opening WO side and the crotch side.

<First form>
1 to 9 show a first type of pants-type disposable diaper. This pants-type disposable diaper has an abdominal exterior sheet 12F that covers the abdominal side of the wearer's girth and a back exterior sheet 12B that covers the back side, and both side edges in the width direction of the abdominal exterior sheet 12F. Both side edges in the width direction of the backside exterior sheet 12B are configured to be welded and joined by heat sealing, ultrasonic welding, or the like over the entire vertical direction of the overlapping portion to form the cylindrical waistline portion 100. . Reference numeral 12A denotes a side seal portion which is a portion where both the

exterior sheets

12F and 12B are welded and joined. A well-known pattern can be used as the welding pattern of the side seal portion 12A without any particular limitation. For example, linear or dotted joints along the vertical direction or oblique direction are arranged in a row at predetermined intervals along the vertical direction. Alternatively, a pattern formed of a plurality of rows, a pattern in which joints are continuous in a straight line along the vertical direction, and the like can be employed.
When the backside exterior sheet 12B extends below the side seal portion 12A as shown in the figure, the backside sheet 12B is integrally processed in the vertical direction including this portion, such as heat sealing. An extension seal portion 12E can be provided on the side extension portion 14. By providing the extended seal portion 12E, it is possible to prevent the second elongated elastic elastic member 16 from being pulled in the back-side extended portion 14 described later. In this case, considering the ease of tearing of the side part, the side seal part 12A is generally composed of a collection of small weld parts, and it is common to have a bonding pattern with a low ratio of the weld area in the side seal part 12A. Since it is not necessary to consider the ease of tearing in the extended seal portion 12E, the second elongated elastic elastic member 16 is reliably welded and fixed by making the ratio of the weld area higher than that of the side seal portion 12A. You may make it do.
Further, the interior body 200 is provided so as to extend from the center in the width direction of the inner surface of the abdominal exterior sheet 12F in the waistline portion 100 to the center in the width direction of the inner surface of the back side exterior sheet 12B. The side exterior sheet 12B is not continuous on the crotch side and is separated. This separation distance Y can be about 150 to 250 mm.
As can be seen from FIGS. 7 and 8, the upper opening of the waistline portion 100 becomes a waist opening WO through which the wearer's torso passes, and the lower edge of the waistline portion 100 and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs pass. In a state where each side seal portion 12A is peeled and deployed, an hourglass shape is formed as shown in FIG. The interior body 200 extends from the back side so as to cover the abdominal side through the crotch part, and is a part that receives the excrement and absorbs and holds the liquid, and the waistline part 100 holds the interior body 200. This is the part that supports the wearer.

(Exterior sheet)
The abdominal side exterior sheet 12F and the back side exterior sheet 12B are formed by folding and bonding one sheet-like breathable material 12 into a two-layer structure as shown in FIGS. A waist-side end W, a waistline upper end U1, a waistline intermediate part U2, and a waistline lower end U3 are provided in the same vertical range as the side seal part 12A from the top.
Characteristically, in each of the

exterior sheets

12F and 12B, the sheet-like breathable material 12 is folded back from the outermost surface to the innermost surface with the waist side end edge (the edge of the waist opening WO) as a fold line throughout the width direction. The folded portion 21 is a layer covering the waist side end W from the middle position in the vertical direction on the innermost surface, and the sheet-like breathable material 12 extends from the outermost surface with the crotch side edge as a folding line over the entire width direction. Folded to the inner surface, the folded portion 22 is a layer covering the lower end U3 of the waistline on the innermost surface. Then, the crotch side edge of the waist side folded part 21 and the waist side edge of the crotch side folded part 22 are separated in the vertical direction so that the waist side folded part 21 and the crotch side folded part 22 do not overlap each other. The spaced-apart portion 23 is a thin layer portion made of a single-layer sheet-like breathable material 12.
The position of the crotch side edge of the waist side folded portion 21 can be determined as appropriate, but the position of the crotch side edge of the waist side folded portion 21 is the front end portion of the interior body 20 in the abdominal exterior sheet 12F. In the overlapping position and the position of overlapping the rear end portion of the interior body 20 in the back side exterior sheet 12B, the front end portion 201 and the rear end portion 202 of the interior body 200 are connected to the waist side folded portion 21 and its outer surface side. When sandwiched between materials and fixed, the edges of the interior body constituent materials exposed at the front edge and the rear edge of the interior body 200 can be covered with the waist-side folded portions 21 of the

exterior sheets

12F and 12B. It is preferable because peeling of the interior body 200 from the

exterior sheets

12F and 12B and deterioration of the touch due to the front and rear ends of the interior body constituent material can be prevented. This structure is also preferable because it is easy to manufacture. However, if the front and rear ends of the interior body 200 are moderately soft, they need not be covered with another sheet.

The sheet-like breathable material 12 constituting each of the

exterior sheets

12F and 12B is not particularly limited as long as it can be joined by welding, but is preferably a nonwoven fabric. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. For example, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, melt blown nonwoven fabric, needle punched nonwoven fabric, thermal bond nonwoven fabric, air-through nonwoven fabric, point bond nonwoven fabric, etc. can be exemplified, but particularly spunbond nonwoven fabric and SMS nonwoven fabric are strong and elastic. Since it is excellent in adhesiveness with a member, it is preferable. When a nonwoven fabric is used, the basis weight is preferably about 10 to 40 g / m ² , particularly about 10 to 22 g / m ² .
In addition, both folded

portions

21 and 22 in both

exterior sheets

12F and 12B are fixed to opposite outermost surface portions with a hot melt adhesive or the like, and both folded

portions

21 and 22 Elongated elastic members 15 to 19 such as rubber thread are sandwiched and fixed in a predetermined stretched state between them and the outermost surface portion facing this. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. Hot melt bonding, heat sealing, or ultrasonic bonding is used to bond the sheet-like

breathable materials

12 and 12 to the

exterior sheets

12F and 12B and to fix the elongated elastic elastic members 15 to 19 sandwiched therebetween. it can. If the entire surface of the

exterior sheets

12F and 12B is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and the other portions are not bonded or are bonded weakly.
More specifically, the back-side exterior sheet 12B includes a back-side body portion 13 that occupies the same vertical range as the side seal portion 12A formed by the welded portion group, and a back-side extension that extends below the back-side body portion 13. And an exit portion 14. The back extension part 14 has a width direction center part 14 </ b> M overlapping with the interior body 200, and a buttock cover part 14 </ b> C extending on both sides thereof.

The shape of the dorsal extension 14 can be determined as appropriate, and is rectangular in the examples shown in FIGS. 1 to 10, but as shown in FIGS. 18 and 19, the upper end of the dorsal extension 14 is It is possible to extend the lower side of the back side main body part 13 with the same width as the back side main body part 13 and cut the lower side into a shape that becomes narrower as it approaches the crotch side. Further, a portion having the same width as the back side main body portion 13 can be omitted. If comprised in this way, the outer edge 14e of the buttock cover part 14C will come in the shape of a straight line or a curve which approaches the interior body 200 side as it approaches the crotch side. The shape is also beautiful.
Although the dimension of the back side extension part 14 can be determined suitably, as shown in FIG. 6, the width direction length 14x of the collar part cover part 14C (the outer edge 14e of the collar part cover part 14C and the side edge of the interior body 200) The maximum separation distance in the width direction is preferably 80 to 160 mm, and the vertical length 14y (extension length) of the collar cover portion 14C is preferably 30 to 80 mm. Further, when the outer edge 14e of the buttock cover portion 14C is curved as shown in FIGS. 18 and 19, a rectangular shape determined by the widest portion in the width direction and the widest portion in the vertical direction of the dorsal extension portion 14 is used. When the area is S, it is appropriate that the area of the back extension 14 is 20 to 80%, particularly 40 to 60% with respect to S.

The back body 13 can be conceptually divided into an upper end (waist part) W and a lower part U below the upper part in the vertical direction, and the range varies depending on the size of the product. The vertical length of the upper end W can be 15 to 80 mm, and the vertical length of the lower portion U can be 35 to 220 mm.
In the waist side end part W which is the upper end part of the back side main-body part 13, it continues over the whole width direction between the waist side return part 21 (outermost inner surface part) and the outermost surface part in the sheet-like breathable material 12. As described above, the plurality of back-side waist elastic elastic members 17 are fixed in a state where they are spaced apart in the vertical direction and stretched along the width direction at a predetermined stretch rate. In addition, one or more of the back-side waist elastic elastic members 17 disposed in the region adjacent to the lower portion U of the back-side main body 13 may overlap the interior body 200. Alternatively, it may be provided on both sides in the width direction except for the central portion in the width direction that overlaps the interior body 200. In the illustrated example, the back-side waist elastic elastic member 17 that overlaps the interior body is disposed between the interior body 200 and the outermost portion, but is disposed between the interior body 200 and the waist-side folded portion. May be. As the back waist elastic elastic member 17, thread rubber having a thickness of 300 to 1240 dtex, particularly about 470 to 940 dtex, about 3 to 22 pieces at an interval of 4 to 12 mm, and an elongation rate of 150 to 400%, particularly 220 to It is preferable to fix at about 320%. Further, it is not necessary for all of the back side waist elastic elastic members 17 to have the same thickness and extension rate. For example, the elastic waist members may have different thicknesses and extension rates at the upper and lower portions of the back waist part. Good.
Moreover, in the waist part U which is a part located in the lower side of the back | dorsal main body part 13, between the crotch side folding | returning part 22 (innermost inner surface part) and the outermost surface part in the sheet-like breathable material 12 in the waist lower end part U3. A plurality of first elongate elastic elastic members 15 are arranged in the vertical direction so as to be continuous over the entire width direction at each of the upper side and both sides in the width direction except for the central portion in the width direction that overlaps the interior body 200 therebetween. Are fixed in a state of being stretched along the width direction at a predetermined stretch rate.

As the first elongated elastic elastic member 15, a rubber thread having a thickness of about 300 to 1240 dtex, particularly about 470 to 940 dtex, about 1 to 15 mm, particularly about 5 to 30 at intervals of 3 to 8 mm, each having an elongation ratio of 200 to It is preferable to fix at 350%, particularly about 240 to 300%.
Moreover, in the back side extension part 14, except the width direction center part which overlaps with the interior body 200 between the crotch side folding | returning part 22 (innermost inner surface part) and the outermost surface part in the sheet-like breathable material 12, A plurality of second elongate elastic elastic members 16 are vertically spaced from each other on both sides in the width direction (at least over the entire buttock cover portion 14C) with a predetermined interval therebetween. It is fixed in a stretched state along the width direction at a stretch rate.

As the second elongated elastic elastic member 16, about 2 to 10 thread rubbers having a thickness of about 300 to 1240 dtex, particularly about 470 to 940 dtex, and an elongation ratio of 150 to It is preferable to fix at 300%, particularly 180 to 260%.

On the other hand, the abdominal side exterior sheet 12F consists of only the abdominal side main body part (the part occupying the same vertical range as the side seal part 12A by the welded part group) basically the same as the back side main body part 13 of the back side exterior sheet 12B. It is a rectangular shape extending along the waistline direction, and does not have the back-side extending portion 14 like the back-side exterior sheet 12B.
That is, among the waist side end W which is the upper end part of the abdominal exterior sheet (abdominal side main body part) 12F and the waist part U located below the waist side end W, the sheet-like breathable material 12 is provided at the waist side end W. A plurality of ventral side waist elastic elastic members 18 are vertically spaced so as to be continuous over the entire width direction between the waist side folded portion 21 (the innermost surface portion) and the outermost surface portion of It is fixed in a stretched state along the width direction at a stretch rate of. The ventral waist elastic elastic member 18 is preferably as close as possible to the back waist elastic elastic member 17 in terms of number, thickness, stretch rate, spacing, and vertical arrangement, but may be different. When differentiating, the difference in number is 6 or less, preferably 3 or less, the difference in thickness is 450 dtex or less, preferably 300 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.
Moreover, in the waist part U of the abdominal side exterior sheet 12F (abdominal side main body part), between the crotch side folding | returning part 22 (innermost inner surface part) and the outermost surface part in the sheet-like air permeable material 12 in the waist lower end part U3. A plurality of third elongated elastic elastic members 19 are vertically spaced apart from each other on the upper side and both sides in the width direction except for the central portion in the width direction that overlaps the interior body 200. And is fixed in a state of being stretched along the width direction at a predetermined stretch rate. Although the vertical disposition range of the third elongated elastic elastic member 19 may be a part of the lower portion, it is preferable that the third elongated elastic elastic member 19 is substantially the whole (a range in which the expansion / contraction force acts on the whole).

The third elongated elastic elastic member 19 is preferably as close as possible to the first elongated elastic elastic member 15 in terms of number, thickness, stretch rate, spacing, and vertical arrangement, but may be different. When differentiating, the difference in number is 10 or less, preferably 5 or less, the difference in thickness is 450 dtex or less, preferably 300 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, the difference in spacing Is 10 mm or less, preferably 5 mm or less.
Characteristically, the waistline upper end U1 and the waistline middle part U2 of each of the abdominal exterior sheet 12F and the back exterior sheet 12B are made of a single-layer sheet-like breathable material 12, and fix the elastic stretchable member and the elastic stretch member. The thin layer portion 23 does not have an adhesive for the purpose. In such a structure, as can be seen from the material lamination structure of the side seal portion 12A shown in FIG. 10B, the waistline upper end U1 and the waistline middle in each of the abdominal exterior sheet 12F and the back exterior sheet 12B. The portion U2 has one sheet-like breathable material 12 laminated, so that the breathability and flexibility of the

exterior sheets

12F and 12B are improved. In the illustrated embodiment, the number of sheet-like breathable materials 12 laminated at the waist-side end of the side seal portion 12A is equal to the number of sheets-like breathable material 12 laminated at the crotch-side end (four). The number of sheet-like breathable materials 12 stacked in the intermediate portion between the waist side end portion and the crotch side end portion is less than that (2 sheets). Therefore, the joint strength of the sheet-like air-permeable material 12 at the waist side end portion and the crotch side end portion in the side seal portion 12A is substantially equal and the side seal portion is formed only by forming the side seal evenly in the side seal portion 12A. It becomes easy to make it the strongest in each part of 12A. The waist-side end and crotch-side end of the side seal portion 12A are portions to which particularly strong force is applied during mounting and are portions to be the starting point or end point of peeling, and the intermediate portion of the side seal portion 12A is after use When peeling off, smooth peeling is required (it is not preferable to be stronger than the start point and end point). Therefore, when configured as described above, there is no unintended peeling of the side seal portion 12A during mounting. And it becomes easy to peel off after use. On the other hand, the conventional type shown in FIG. 20 has six sheets of breathable material 12 laminated at the waist end and four sheets of breathable material 12 laminated at the crotch end. Therefore, it is difficult to obtain the above effects.

The vertical length of the thin layer portion 23 can be determined as appropriate. However, if the length is excessively long, the number of portions where the elastic elastic members 15 to 19 can be provided decreases, and it becomes difficult to ensure the fit. It is preferable to be about 1/20 to 1/8 of the length in the front-rear direction in the unfolded state.
Here, as in the above example, both the waistline middle portion U2 of the ventral outer layer sheet 12F and the waistline middle portion U2 of the backside outer layer sheet 12B do not have elastic elastic members, and the back extension portion 14 is the second. (When the ventral outer layer sheet 12F as described later has a ventral extension part, the contraction force of the ventral extension part is greater than the dorsal extension part 14, or When the back side extension part is larger than the abdominal side extension part), the contraction force balance between the abdominal side and the back side with the side seal part 12A as a boundary is broken, and the lower end side of the side seal part 12A is the back side. As shown in FIG. 27, the side seal portion 12A of the back side exterior sheet 12B and the abdominal side exterior sheet 12F shifts to the back side toward the lower end side as shown in FIG. , This shift causes the buttock cover There is a possibility that the bulge and turn-up occurs in the 4C.

In order to avoid such a phenomenon, the contraction force by the respective elongated

elastic expansion members

18 and 19 of the ventral side exterior sheet 12F and the contraction force by the respective elongated elastic expansion members 15 to 17 of the back side exterior sheet 12B are: It is preferable to balance the joint portion 12A as a boundary so that the side seal portion inclination angle is 20 degrees or less, particularly preferably 10 degrees or less, and more preferably 5 degrees or less. Specifically, the shrinkage force in the width direction at the waistline lower end portion U3 of the ventral outer layer sheet 12F, the shrinkage force in the width direction at the waistline lower end portion U3 of the backside outer layer sheet 12B, and the widthwise direction in the backside extension portion 14 By making it stronger than the contraction force, the contraction force by the respective elongated

elastic expansion members

18 and 19 of the abdominal exterior sheet 12F and the contraction force by the respective elongated elastic expansion members 15 to 17 of the back exterior sheet 12B are joined. The side seal portion inclination angle is reduced by balancing at 12A as a boundary, and the rising and swelling of the flange cover portion 14C can be prevented. The “side seal portion inclination angle” and the “shrinkage force” are as described above.

On the other hand, the abdominal side exterior sheet 12F in the illustrated form is composed of only the portion that occupies the same vertical range as the side seal portion 12A, but, similarly to the back side, the belly side occupying the same vertical range as the side seal portion 12A. It can also be set as the structure which consists of a side main-body part and the abdominal-side extension part extended below this abdominal-side main-body part. Thereby, the leg periphery shape of the abdominal exterior sheet | seat 12F can be made into the shape fitted along a buttock. In this case, the area of the ventral extension and the length in the front-rear direction are preferably 10 to 80%, more preferably 20 to 50% of the area of the back extension and the length in the front-rear direction. If the ventral extension is excessively large, the fit is rather impaired, which is not preferable.
Further, as shown in the drawing, the first, second, and third elongated elastic

elastic members

15, 16, and 19 are provided on both sides in the width direction except for the center portion in the width direction that overlaps the interior body 200. However, it is preferable because the inner body 200 and the

outer sheets

12F and 12B are difficult to peel off. In this form, in addition to the form in which elastic elastic members are present only on both sides in the width direction, one side in the width direction across the inner body 200 There is an elastic stretch member from one side to the other side, but the elastic stretch member is cut at the central portion in the width direction overlapping with the interior body 200, and the stretch force does not act (substantially no elastic stretch member is provided) (Equal) is also included. Also, a part of the first, second and third elongated elastic

elastic members

15, 16 and 19, or the elastic force acts over the entire width direction of the back side main body part 13 and the back side extension part 14. The whole can be provided across the interior body 200 from one side in the width direction to the other side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIG. 3, the inner body 200 includes a surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. On the back side of the liquid-impermeable sheet 11, a crotch portion is provided so as to cover the entire back surface of the interior body 200 or to cover the entire portion exposed between the abdominal exterior sheet 12F and the back exterior sheet 12B. The exterior sheet 12M can also be fixed. In addition, an intermediate sheet (second sheet) 40 can be provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Furthermore, in order to prevent excrement from leaking on both sides of the interior body 200, barrier cuffs 60 and 61 standing on the body side can be provided on both sides of the interior body 200. Although not shown, the constituent members of the interior body 200 can be appropriately fixed to each other by solid, bead or spiral application such as hot melt adhesive. The interior body 200 can also be detachably attached to the

exterior sheets

12F and 12F using a mechanical fastener or an adhesive material.
In addition, in the width direction both sides of the interior body 200, particularly in the vicinity of the intersection point between the width direction both side edges of the interior body 200 and the lower end edge of the ventral side exterior sheet 12F and in the vicinity of the intersection point between the lower end edge of the back side exterior sheet 12B. The rigidity (rigidity) of 15 to 50 cN / 50 mm, particularly 20 to 35 cN / 50 mm, is preferable because the overall standing shape of the barrier cuffs 60 and 61 as described later is further stabilized. On the other hand, the rigidity of the other parts, for example, the intermediate part in the width direction, is preferably lowered to 5 to 35 cN / 50 mm, preferably 10 to 25 cN / 50 mm in consideration of flexibility. The range in which the rigidity is increased is a range of 5 to 30 mm in the width direction from both side edges of the interior body 200 to the center side in the width direction, and the interior body 200 and the abdominal exterior sheet 12F and the back exterior sheet 12B in the front-rear direction. It is preferable that the distance is within 50 mm in the front-rear direction from the intersection (not including the portion overlapping with the constricted portion 56N of the absorber 56).

Stiffness (rigidity) is measured by the following method in accordance with JIS K-7171 (plastic-bending stiffness test method). For the measurement, a tensilon tester (curvature radius R1 = 5.0 ± 0.1 mm at the tip of the indenter, curvature radius R2 = 5.0 ± 0.2 mm at the tip of the support plate) was used, and the product 200 of the interior 200 Measure the bending stiffness. The test piece is prepared by removing the elastic elastic member that affects the measurement from the inner body 200 and cutting it into a rectangle having a diaper longitudinal direction of 80 mm and a diaper width direction of 50 mm. 50 mm in the unit of the flexural rigidity value is the length of the short side of the test piece, and is the width of the test piece bent with the indenter at the time of the test. On the pair of support plates each having a tip portion having an arcuate cross-section, the interval between the tips (upper ends) of both tip portions being 50 mm, arranged in parallel with each other and the height positions of both tip portions being aligned, The test piece is placed so that its longitudinal direction is directed in a direction perpendicular to each plate, and the tip of the indenter is arranged so as to slightly touch the test piece. A load-deflection curve is obtained by lowering the indenter under conditions of a load cell of 5 kg (range 196 cN) and a speed of 30 mm / min. Let the maximum value of the obtained bending stress be a bending rigidity value (cN / 50 mm). In addition, when the site | part used as a measuring object is smaller than the said sampling dimension, it measures with a small scale test piece, and converts it by proportional calculation based on a dimension ratio.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spun lace method, a spun bond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

When the barrier cuffs 60 and 61 are provided, both side portions of the surface sheet 30 pass between the liquid-impermeable sheet 11 and the barrier cuffs 60 and 61 to the back side of the absorbent element 50 to prevent liquid penetration. Therefore, it is preferable to adhere to the liquid-impermeable sheet 11 and the barrier cuffs 60 and 61 with a hot melt adhesive or the like. Thereby, the effect that the rigidity of the both sides of the interior body 200 is improved is also obtained.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.
Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably 20 ~ 80g / m ^2, more preferably 25 ~ 60g / m ^2. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.
The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid. When the intermediate sheet 40 goes from the width direction side portion to the back surface side of the absorber 56 and is bonded and fixed with a hot melt adhesive or the like, the rigidity of both side portions of the interior body 200 is improved. A typical material of the intermediate sheet 40 is a nonwoven fabric having excellent liquid permeability.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a film material (waterproof film) made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet, Non-woven fabrics that are substantially liquid-impervious with a waterproof film interposed (in this case, a liquid-impervious sheet is composed of the waterproof film and the non-woven fabric) can be exemplified. Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.
The liquid-impermeable sheet 11 is preferably extended around both sides of the absorbent element 50 to both sides of the side surface 30 of the absorbent element 50 in order to improve leakage prevention. Thereby, the effect that the rigidity of the both sides of the interior body 200 is improved is also obtained. The width of this extended portion is suitably about 5 to 20 mm on the left and right.

Further, the inner surface or the outer surface of the liquid-impermeable sheet 11 may be designed by printing or coloring. Further, a printed or colored design sheet, which is a separate member from the crotch outer sheet 12M, may be attached to the outside of the liquid-impermeable sheet 11. Further, an excretion indicator 80 whose color changes due to absorption of the liquid component can be provided inside the liquid-impermeable sheet 11.

(Barrier cuffs)
The barrier cuffs 60 and 61 are belt-like members extending along the both sides of the interior body 200 over the entire front-rear direction, blocking urine and soft stool that travel along the top sheet 30 in the lateral direction and prevent side leakage. It is provided to prevent this.
In the present embodiment, as shown in FIGS. 3 and 4, barrier cuffs 60 and 61 are provided twice on the left and right sides of the interior body 200. In the state where the diaper is unfolded, as shown in the figure, the inner barrier cuff 61 stands obliquely from the side of the interior body 200 toward the center in the width direction, and the outer barrier cuff 60 is in the width direction of the inner barrier cuff 61. The outer side portion is provided so as to stand upright from the side of the interior body 200, the base side portion stands obliquely toward the center in the width direction, and the tip side portion from the intermediate portion stands obliquely outward in the width direction. To do.

More specifically, the inner barrier cuff 61 folds the belt-like barrier sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. Between them, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. The elongated elastic elastic member 63 is not fixed to the barrier sheet 62 at the front and rear ends, and is fixed so that the barrier cuff extends and contracts in the middle part. The barrier sheet 62 is made of a spunbonded nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric having excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex yarn rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Although not shown, a waterproof film can be interposed between the barrier sheets folded in two.
One or two elongated elastic expansion / contraction members 63 are preferably disposed at the distal end portion of the inner barrier cuff 61, and more preferably, one or two are disposed at an intermediate portion between the distal end portion and the proximal end portion. When the elongated elastic elastic member 63 is present in the intermediate portion, it becomes easy to hit the skin against the surface in the range from the intermediate portion to the distal end portion using this as a fulcrum. The arrangement position of the elongated elastic elastic member 63 in the middle is preferably in the range of 30 to 70% of the height of the inner barrier cuff 61 (length in the width direction of the protruding portion). In the infant paper diaper, the height of the inner barrier cuff 61 is preferably about 15 to 35 mm. Therefore, the arrangement range of the elongated elastic stretch member 63 is preferably 5 to 25 mm from the distal end to the proximal end, and is 12 to 18 mm. Is more preferable. When the elongated elastic elastic members 63 are provided in parallel at the front end portion and / or the intermediate portion of the inner barrier cuff 61, the arrangement interval 61d is preferably 2 to 10 mm, and more preferably 2 to 6 mm.
The end of the inner barrier cuff 61 opposite to the folded portion in the width direction is an attachment portion (inner attachment portion) 65 fixed to the back surface of the side edge of the interior body 200. The portion is a protruding portion 66 (a portion on the folded portion side and corresponding to the inner protruding portion) protruding from the mounting portion 65, and both ends in the front-rear direction of the protruding portion 66 are hot melt adhesive on the surface of the surface sheet 30. And a front-rear fixing portion 67 by heat sealing, and a middle portion in the front-rear direction is an unfixed free portion (inner free portion), and an elongated elastic member 63 along the front-rear direction is fixed to the free portion in an extended state. Yes.

The outer barrier cuff 60 also has basically the same structure as the inner barrier cuff 61, but its attachment portion (outer attachment portion) 68 is an attachment portion 65 of the inner barrier cuff 61 on the back side of the interior body 200. Further, both ends in the front-rear direction of the projecting portion (outer projecting portion) 69 pass from the mounting portion 68 to the side of the interior body 200, and are fixed to the outer surface of the inner barrier cuff 61 on the center side in the width direction. 61, a base side portion that extends to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66 and is fixed to the surfaces of both end portions in the front-rear direction of the inner projecting portion 66, and is folded back outward in the width direction from the tip of the base side portion. In addition, the point differs from the front end side portion fixed to the base side portion, the arrangement and number of the elongated elastic elastic members 63, and the like.

However, the inner barrier cuff 61 also has a structure in which the tip of the inner protruding portion is folded outward in the width direction, specifically, not more than 1/2 of the height of the inner barrier cuff 61 (width direction length of the protruding portion), If it is preferably 1/3 or less, a structure in which the tip side portion is folded back in the width direction and fixed to the base portion side portion similarly to the outer barrier cuff 61 may be adopted.

The number of the elongated elastic elastic members 63 provided in the free part (outer free part) of the outer barrier cuff 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side. The elongated elastic elastic member 63 disposed on the outer barrier cuff 60 has the same thickness and elongation rate as the inner barrier cuff 61, but the thickness is the same as or larger than that of the inner barrier cuff 61, and the elongation rate is the inner barrier cuff 61. The same or lower than that of 61 is preferred.
Further, the front-rear direction length L6 of the front-rear fixing portion 67 of the protruding

portions

66, 69 is preferably formed so that the inner barrier cuff 61 is the same as or shorter than the outer barrier cuff 60, and is elongated in the barrier cuffs 60, 61. The length of the elastic stretch member 63 in the front-rear direction is preferably formed so that the inner barrier cuff 61 is the same as or longer than the outer barrier cuff 60. The boundary between the attachment portion 65 and the protruding portion 66 may be the same position on the outer barrier cuff 60 and the inner barrier cuff 61, but the boundary of the outer barrier cuff 60 is the center in the width direction than the boundary of the inner barrier cuff 61. It is preferable to be spaced apart to the side, and the distance is preferably within 10 mm.

It is preferable to form a linear root fixing part by hot melt adhesive or heat sealing at the edge part on the protruding

parts

66, 69 side of the attaching

parts

68, 65 of the outer barrier cuff 60 and the inner barrier cuff 61. The other fixing parts can be fixed in an appropriate pattern using a hot melt adhesive or the like. The linear root fixing portion is located in the vicinity of the side portion on the front surface side of the interior body 200 (specifically, the position from 0 to 5 mm in the width direction from the side edge, preferably 0 to 3 mm) or the back surface side. preferable. In this case, since the barrier cuff is folded and fixed to the surface side substantially only at both ends in the front-rear direction, in the crotch part where the restriction to the center in the width direction by the front-rear fixing part 67 does not sufficiently act. The outer barrier cuff 60 and the inner barrier cuff 61 both stand up outward in the width direction, and the pocket formed by the inner barrier cuff 61 becomes wider. When the linear root fixing part is positioned over 5 mm in the width direction from the side edge on the surface side, the barrier cuff rises toward the center in the width direction also in the crotch part, and the pocket formed by the inner barrier cuff 61 is narrow Therefore, it is not preferable. In the case of being located on the back side, a position of 0 to 20 mm from the side edge of the interior body 200 is appropriate, but it may be located beyond 20 mm.
The fixing target of the

attachment portions

68 and 65 of the outer and inner barrier cuffs 60 and 61 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbent element 50 in the interior body 200. The other barrier cuff can be fixed to the interior body 200 via one barrier cuff.

In the outer and inner barrier cuffs 60 and 61 configured in this way, the contraction force of the elongated elastic elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the both ends in the front-rear direction among the protruding

parts

66 and 69 do not stand up. However, only the free part stands up against the body side as shown in FIG. 3. In particular, when the

attachment portions

68 and 65 are located on the back side of the interior body 200, the outer and inner barrier cuffs 60 and 61 stand up so as to open outward in the width direction at the crotch portion and the vicinity thereof. The barrier cuffs 60, 61 come into contact with the legs around the surface, and the fit is improved. On the other hand, on both the front and rear sides (abdomen and back) of the crotch part, the inner and rear barrier cuffs 61 are restricted by the front and rear fixing part 67 so that the outer and inner barrier cuffs 60 and 61 do not open outward in the width direction. In addition, since the lower half of the outer barrier cuff 60 is also erected in the same manner, it is possible to surely prevent the abdomen and the back from leaking from both sides of the interior body 200. Further, the front and rear fixing portions 67 of the protruding portion 66 of the inner barrier cuff 61 are not folded back, and the front and rear fixing portions 67 of the protruding portion 68 of the outer barrier cuff 60 are folded outward. , 61 is maintained between the inner and outer free parts, and the outer and inner barrier cuffs 60, 61 are securely raised at a wide interval, and each fits around the leg, providing excellent leakage prevention. It will be.

Although the dimensions of the barrier cuffs 60 and 61 can be determined as appropriate, in the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the inner barrier cuff 61 (the length in the width direction of the protruding portion 66 in the unfolded state). ) W5 is preferably 10 to 50 mm, particularly preferably 15 to 35 mm, and the standing height of the outer barrier cuff 60 (length in the width direction of the protruding portion 69 in the unfolded state) W6 is 15 to 60 mm, particularly 20 to 40 mm. Is preferred. Further, the distance W4 between the tips when the inner barrier cuff 61 is tilted to the surface of the top sheet 30 is preferably 60 to 170 mm, particularly preferably 70 to 120 mm. In addition, when the outer barrier cuff 60 is flatly folded so as to be parallel to the surface of the top sheet 30, the separation distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.
Unlike the illustrated embodiment, only one of the outer and inner barrier cuffs 60 and 61 can be provided.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a covering sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The covering sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be, for example, about 100 to 300 g / m ² when stacking cotton-like pulp or short fibers, and about 30 to 120 g / m ² for filament aggregates, for example. Can do. The fineness in the case of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

The absorber 56 may be rectangular, but as shown in FIG. 6, the front end portion 56F, the rear end portion 56B, and a constricted portion having a narrower width than those of the front end portion 56F and the rear end portion 56B. It is preferable to form an hourglass shape having 56N because the fit of the absorber 56 itself and the barrier cuffs 60, 61 around the legs is improved. As specific dimensions, the length in the front-rear direction of the absorber front end portion 56F is L1, the length in the front-rear direction at the overlapping portion between the absorber 56 and the ventral exterior sheet 12F is L2, and the length of the front and rear ends of the absorber rear end portion 56B. The length in the direction is L3, the length in the front-rear direction at the overlapping portion between the absorber 56 and the back exterior sheet 12B is L4, the minimum width of the constricted portion 56N is W1, the width of the absorber front end portion 56F and the rear of the absorber When the width of the end portion 56B is W2, it is preferable that the end portion 56B is configured to satisfy the following expressions (1) to (4).

70 mm ≦ W1 <W2 ≦ 190 mm (1)
0.5 ≦ W1 / W2 ≦ 0.85 (2)
0mm ≤ L1-L2 ≤ 70mm (3)
0mm ≤ L3-L4 ≤ 50mm (4)
If W1 and W2 are too narrow, the standing of the barrier cuffs 60 and 61 becomes unstable, and the amount of absorption becomes insufficient. If it is too wide, the fit feeling deteriorates due to a decrease in fit.
In addition, when the value is within the above numerical range, the absorber 56 does not exist in the vicinity of the attachment portion 65 of the

barrier cuff

60, 61 in the crotch portion. Therefore, the degree of freedom of movement of the

barrier cuff

60, 61 increases, and the

barrier cuff

60, 61 Is easy to open outward in the width direction, and it is easy to hit the skin with the surface, and the followability of the fit surface to the movement of the leg is improved. Since the absorber 56 on the side of the interior body 200 exists in a sufficient range on both the front and rear sides, the standing of the barrier cuffs 60 and 61 is stabilized with this as a base point (fulcrum). A portion extending from the front and rear sides to the crotch portion is a displacement portion in which the barrier cuffs 60 and 61 are opened outward from the posture in which the barrier cuffs 60 and 61 stand up inward in the width direction with reference to both side edges in the width direction. The posture change of 60, 61 is supported by the absorber 56 that exists up to the side of the interior body 200, and the overall standing shape of the barrier cuffs 60, 61 is stabilized. If the constricted part is too large outside the above numerical range, the degree of freedom of the barrier cuffs 60 and 61 becomes too high in the crotch part, and there is a possibility that a gap is easily formed around the leg, and both the front and rear sides of the crotch part However, since there is no base point (fulcrum), the standing of the barrier cuffs 60 and 61 may become unstable. Conversely, if the constricted portion becomes too small, the degree of freedom of the barrier cuffs 60 and 61 is lowered, which is not preferable.
Furthermore, the longitudinal length L7 of the entire constricted portion 56N is preferably 80 mm or more, and particularly preferably 120 to 260 mm. If the length L7 in the front-rear direction of the constricted portion 56N is too short, the degree of freedom of the barrier cuffs 60 and 61 is lowered, and the fit of the absorbent body 56 around the legs is lowered to prevent the movement of the legs, which is too long. And the standing of the barrier cuffs 60 and 61 becomes unstable.

(Superabsorbent polymer particles)
Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.
As the superabsorbent polymer, one integrated with an antibacterial substance can be used. In particular, zeolite particles obtained by substituting some or all of the ion-exchangeable ions in the zeolite with silver ions (hereinafter referred to as antibacterial deodorant zeolite) are contained in the superabsorbent polymer or antibacterial. Antibacterial deodorant superabsorbent polymer particles obtained by adhering deodorant zeolite particles to the surface of superabsorbent polymer particles by static electricity are suitable.

As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.
The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. Exceeds 350 g / m ^2, the effect is saturated.
If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Enveloping sheet)
In the case of using the covering sheet 58, a paper material such as tissue paper or crepe paper, a nonwoven fabric, a polylaminated nonwoven fabric, a sheet having small holes, or the like can be used as the material. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
As shown in FIG. 2, the covering sheet 58 may cover only the back and side surfaces of the layer in addition to the form for covering the entire absorbent body 56. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials becomes a component of the covering sheet). If necessary, the absorbent body 56 may be sandwiched between upper and lower two-layer sheets or disposed only on the lower surface, but this is not a desirable form because it is difficult to prevent the movement of the superabsorbent polymer particles.

(Crotch exterior sheet)
A crotch outer sheet 12M exposed on the outer surface of the product is provided on the back side of the inner body 200. As the material of the crotch outer sheet 12M, the same material as the abdominal outer sheet 12F and the back outer sheet 12B can be used, but a material containing a higher-strength material or a deodorant, etc. A material different from the exterior sheet 12F and the back-side exterior sheet 12B may be used. Specifically, various nonwoven fabrics such as spunbond nonwoven fabric, melt blown nonwoven fabric, point bond nonwoven fabric, air-through nonwoven fabric, air point nonwoven fabric, spunlace nonwoven fabric, SMS nonwoven fabric, and the like made of fibers of PP, PP / PE, PP / PET, or the like, or What added the deodorizer etc. to this can be used.
A high body pressure is applied to the crotch outer sheet 12M when sitting. Therefore, a material having a high friction fastness (not fuzzy) is preferable.
The crotch outer sheet 12M may be a sheet provided with design elements by printing or coloring. When used in combination with the above-described design sheet, it is preferable to dispose the designs so that they do not overlap.
It is preferable to use a stretchable nonwoven fabric as the crotch outer sheet 12M and to extend and paste in the longitudinal direction of the inner body 200 because the fit of the crotch part is improved.
When the crotch outer sheet 12M goes from the side in the width direction to the side of the body and is bonded and fixed to the outer surface of the barrier sheet 62 with a hot melt adhesive or the like, the rigidity of both sides of the inner body 200 is improved. In such a form, it is preferable to use a sheet having high rigidity (roughness) as the crotch outer sheet 12M. Specifically, a sheet having a bending resistance measured by the Clark method (JISL1096 C method) and a sum of the MD direction and the CD direction of the sheet of 100 mm or more, preferably 150 mm or more may be used.
In the illustrated example, the crotch outer sheet 12M is sandwiched between the inner body 200 and the abdominal and

dorsal exterior sheets

12F and 12B where the abdomen and

dorsal exterior sheets

12F and 12B overlap the interior body 200. However, it is also possible to affix them to the outside of the ventral and

backside exterior sheets

12F and 12B. The crotch outer sheet 12M is affixed to the back surface of the inner body 200 and the inner or outer surfaces of the abdominal and back-side

outer sheets

12F and 12B with a hot melt adhesive or the like.

<Second form>
FIG. 11 to FIG. 13 show a pants-type disposable diaper of the second form. In the first embodiment, the waistline middle portion U2 of the abdominal exterior sheet 12F and the waistline upper end U1 of the backside exterior sheet 12B are made of a single-layer sheet-like breathable material and are used to fix the elastic elastic member and the elastic stretch member. On the other hand, in the second embodiment, the elastic elastic member 19 is also provided in the waistline middle portion U2 of the abdominal exterior sheet 12F, and the waistline upper end of the backside exterior sheet 12B is provided. The difference is that the elastic elastic member 15 is also provided in the portion U1.
Thus, in the abdominal side exterior sheet 12F, the waistline middle portion U2 becomes a portion having a plurality of layers and the elastic elastic member 19 and the adhesive, and the waistline upper end portion U1 becomes a portion not having the elastic elastic member 19 and the adhesive, In the backside exterior sheet 12B, on the other hand, the waistline intermediate portion U2 is a portion that does not have the elastic elastic member 15 and the adhesive, and the waistline upper end portion U1 is a portion that has a plurality of layers and has the elastic elastic member 15 and the adhesive. In the product state in which the abdominal exterior sheet 12F and the back exterior sheet 12B are overlapped, the thin layer portion 23 of the abdominal exterior sheet 12F and the thin layer portion of the back exterior sheet 12B do not overlap. Each thin layer portion 23 is displaced in the vertical direction, and in the same vertical direction range as the thin layer portion 23 of the ventral side exterior sheet 12F, the back side exterior sheet 1 provided in the range. The elastic stretch member 15 of B secures stretchability around the waist, and in the same vertical range as the thin layer portion 23 of the backside exterior sheet 12B, the elastic stretch member 19 of the abdominal exterior sheet 12F provided in the range Elasticity around the waist is secured. Accordingly, the flexibility and breathability are further improved, and the fit around the waist is not easily lowered, and the waist is hardly bumped.

<Third embodiment>
Instead of folding one sheet-like breathable material 12 on both the waist side and the crotch side to form the

entire exterior sheet

12F, 12B in a two-layer structure as in the first embodiment, FIG. 14 and FIG. 15, on the waist side, the sheet-like breathable material 12 that forms the outermost surface is folded back at the waist-side edge, and the waist-side end portions W of the

respective exterior sheets

12F and 12B, etc. The necessary part is configured in a two-layer structure, and on the crotch side, a separate sheet-like breathable material 12X is bonded to the inner surface side of the sheet-like breathable material 12 that forms the outermost surface, and each of the

exterior sheets

12F, 12B It is also proposed to configure the necessary parts such as the waistline lower end U3 in a two-layer structure. In this case, the edge of the sheet-like

breathable material

12, 12X is exposed at the crotch side edge of each of the

exterior sheets

12F, 12B, but is not exposed to other parts. That is, the edge of the sheet-like breathable material of each exterior sheet does not have to be exposed at the waist side edge where peeling and deterioration of the touch are particularly likely to occur.
Contrary to the illustrated embodiment, on the waist side, a separate sheet-like breathable material is bonded to the inner surface side of the sheet-like breathable material 12 that forms the outermost surface, and the waist-side end portions W of the

respective exterior sheets

12F and 12B. Are formed in a two-layer structure, and on the crotch side, the sheet-like breathable material 12 forming the outermost surface is folded back at the crotch side edge, and the lower end U3 of the waistline of each of the

exterior sheets

12F and 12B It is also possible to configure a necessary part such as a two-layer structure. Further, on both the waist side and the crotch side, a separate sheet-like breathable material is bonded to the inner surface side of the sheet-like breathable material 12 that forms the outermost surface, and the waist-side end portions of the

respective exterior sheets

12F and 12B It is also possible to configure the necessary portions such as W and the waistline lower end portion U3 in a two-layer structure.

<4th form>
Instead of sandwiching and fixing the front end portion 201 and the rear end portion 202 of the interior body 200 between the waist side folded portion 21 and its outer surface side material as in the first embodiment, FIG. 16 and FIG. As shown in FIG. 17, the

slits

27 and 27 along the width direction are formed in the center in the width direction of the

respective exterior sheets

12F and 12B, and the front end portion 201 of the interior body 200 is passed through the slit 27 of the ventral exterior sheet 12F. Then, it is fixed to the outer surface of the abdominal exterior sheet 12F with a hot melt adhesive or the like, and the rear end portion 202 of the interior body 200 is passed through the slit 27 of the back exterior sheet 12B to hot melt bond to the outer surface of the back exterior sheet 12B. Fixing with an agent or the like is also proposed. In this case, since the edge of the interior body constituent material exposed at the front edge and the rear edge of the interior body 200 is located on the outer surface of each

exterior sheet

12F, 12B, the interior body 200 is peeled off from the

exterior sheets

12F, 12B. And the deterioration of the touch by the front-and-back ends of the interior body 200 can be prevented. Although the illustrated example is a modification of the first embodiment, it can be applied to the second and third embodiments, and particularly between the sheet-like breathable materials 12 of the

exterior sheets

12F and 12B as in the third embodiment. It is suitable when it is difficult to pinch.

<5th form>
Moreover, instead of sandwiching and fixing the front end portion 201 and the rear end portion 202 of the interior body 200 between the waist side folded portion 21 and the outer surface side material as in the first embodiment, FIG. As shown in FIG. 15, the front end 201 and the rear end 202 of the interior body 200 are joined to the innermost surface of the abdominal exterior sheet 12F and the innermost surface of the back exterior sheet 12B, respectively, with a hot melt adhesive or the like. A front cover sheet 25 integrated with a hot melt adhesive or the like from the front end portion 201 of the interior body to the innermost surface portion of the ventral exterior sheet 12F located on the front side and both sides in the width direction; and The rear cover sheet 2 integrated from the rear end portion 202 of the interior body 200 to the innermost surface portion of the back side exterior sheet 12B located on the rear side and both sides in the width direction. Also it is proposed be pasted by a hot-melt adhesive or the like. In this case, since the edge of the interior body constituent material exposed to the front edge and the rear edge of the interior body 200 can be covered with the front and rear cover sheets and pressed against the

exterior sheets

12F and 12B, The peeling of the interior body 200 from the

exterior sheets

12F and 12B and the deterioration of the touch due to the front and rear ends of the interior body 200 can be prevented. As can be seen from the drawing, the fifth embodiment is particularly suitable when it is difficult to sandwich the interior body 200 between the sheet-like breathable materials 12 of the

exterior sheets

12F and 12B as in the third embodiment. The present invention can also be applied to the first and second embodiments.

<Sixth form>
The sixth embodiment relates to the improvement of the interior body 200. As shown in FIGS. 20 to 24, the front and rear lengths of the liquid-impermeable sheet 11 and the covering sheet 58 are shorter than those of the first to fifth embodiments, and the front and rear end portions 201 of the interior body 200 are shown. , 202 does not have the liquid-impermeable sheet 11 and the covering sheet 58. However, the liquid-impermeable sheet 11 and the covering sheet 58 are longer in the front-rear direction than the absorbent body 56 and extend to the front side and the rear side of the absorbent body 56. The intermediate sheet 40 does not exist at the front and

rear end portions

201 and 202 of the interior body 200 as in the first to fifth embodiments. On the other hand, the topsheet 30 and the crotch outer sheet 12M extend to the front and

rear ends

201 and 202 of the interior body 200, and the topsheet 30 and the crotch exterior sheet 12M are the front and

rear ends

201 and 202 of the interior body 200. Are joined over the entire width direction by an adhesive 31 such as a hot melt adhesive. As can be seen from this structure, the crotch outer sheet 12M is preferably disposed over the entire length of the interior body 200, and the front and

rear end portions

201 and 202 of the interior body 200 are preferably composed of only a nonwoven fabric. . Here, the “front and rear end portions of the interior body” means a portion including at least a part of the fixed portion with respect to the

exterior sheets

12F and 12B, and for example, from the front edge and the rear edge of the interior body 200 to the crotch side, respectively. The portion can be about 5 to 15 mm.
In the disposable diaper thus configured, the front and rear end portions 201 and 202 (particularly the end edges) of the interior body 200 are thin and soft, and are excellent in air permeability. Therefore, as described above, the front and

rear end portions

201 and 202 of the interior body 200 are covered with the waist-side folded portion 21, inserted into the outside of the exterior sheets 12 </ b> F and 12 </ b> B, or covered with the

cover sheets

25 and 26. In combination, it is possible to further improve the feeling of wearing, and it is possible to suppress the deterioration of the feeling of wearing even if it is exposed to the inner surface without being covered. Further, since the front and

rear end portions

201 and 202 of the interior body 200 are thin and soft, the end portion of the interior body 200 is separated from the

exterior sheets

12F and 12B when the entire interior body 200 is exposed on the inner surface side of the

exterior sheets

12F and 12B. Even if it does, it does not give the wearer a sense of incongruity. Therefore, it is not necessary to extend the fixing portion of the interior body 200 to the

exterior sheets

12F and 12B to the end edges (at the end portions) of the front and

rear end portions

201 and 202 of the interior body 200 (not shown). Easy to manufacture. Further, at this time, the crotch side edge of the space between the front and

rear end portions

201 and 202 of the interior body 200 with respect to the

exterior sheets

12F and 12B is closer to the front and back of the interior body 200 than the front and rear edges of the liquid-impermeable sheet 11. It is preferable that it is positioned closer to the edge of the film because only the thin and soft part is separated. On the other hand, if the liquid-impermeable sheet (particularly the film material) 11 and the covering sheet (particularly the paper material) 58 exist at the front and

rear end portions

201 and 202 of the interior body 200, the air permeability deteriorates and the front and rear The edge becomes stiff. (This is also the case when the absorbent body 56 is present at 201 and 202 at the front and rear ends of the interior body 200.) As can be seen from this, when using a nonwoven fabric as the covering sheet 58, the covering sheet 58 is used. Can be extended to the front and

rear ends

201 and 202 of the interior body 200. In this case, there is little decrease in air permeability, and the front and rear end portions of the interior body 200 are not easily hardened.

On the other hand, of the elongated elastic elastic members 63 attached to the barrier cuff 60, the elongated elastic elastic member 63 located on the outermost side in the width direction has a fixed length (the contraction force of the elongated elastic elastic member 63 acts). The length of the portion in the front-rear direction (corresponding to the entire length of the member 63 in the drawing) is preferably longer than the length in the front-rear direction of the absorbent body 56, and the spaced-apart portions of the front-

rear end portions

201, 202 of the interior body 200 with respect to the

exterior sheets

12F, 12B It is particularly preferred that the fixation extends up to. With such a structure, when the entire interior body 200 is located on the inner surface side of the

exterior sheets

12F and 12B (particularly exposed), the interior surface of the interior body 200 is rounded and recessed to form a three-dimensional structure. It is preferable because it has a hull shape and improved fit. However, if the elongated elastic expansion / contraction member 63 located on the outermost side in the width direction is too strong among the elongated elastic expansion / contraction members 63, the inner body 200 is excessively curved, and conversely, the fitting property is impaired. It is preferable that the elongation rate at the time of fixation is lower than that of other elongated elastic elastic members arranged and fixed along the front-rear direction. The barrier cuff 60 in the sixth embodiment is not a double structure inside and outside like the first to fifth embodiments, but only the same as the outer barrier cuff 60 in the first to fifth embodiments. However, it may be a single structure consisting of only the inner barrier cuff 61 in the first to fifth embodiments, or a double structure similar to the first to fifth embodiments. You can also. Moreover, in order to prevent the leakage from the side part of the interior body 200, a waterproof film can be included in the barrier cuffs 60, 61. In that case, the range in the front-rear direction similar to the liquid-impermeable sheet 11 is used. Can be arranged. Therefore, if the leakage from the side portion of the interior body 200 is prevented, the water resistance of the barrier sheet 62 constituting the barrier cuffs 60 and 61 is further improved, or the liquid impermeability as in the illustrated example. It is preferable that the sheet 11 wraps around both sides of the absorbent element 50 and extends to both sides of the side surface 30 of the absorbent element 50.

<Seventh form>
The seventh embodiment is the embodiment shown in FIGS. 29 to 34, and the parts not shown in these drawings are the same as the first embodiment, and can be understood by referring to the drawings of the first embodiment. . In the seventh embodiment, the abdominal exterior sheet 12F and the back exterior sheet 12B are formed by folding a single sheet-like material 12 so as to have a two-layer structure as shown in FIGS. Is. Characteristically, in each of the

exterior sheets

12F and 12B, the sheet-like material 12 is folded back from the outermost surface to the innermost surface with the waist side edge (the edge of the waist opening WO) as a fold line throughout the entire width direction. The portion is formed as a waist-side folded portion 21 that covers the entire portion on the waist side from the intermediate position in the vertical direction on the innermost surface, and the sheet-like material 12 extends from the outermost surface to the innermost surface with the crotch side edge as a fold line throughout the entire width direction. The folded portion is formed as a crotch side folded portion 22 that covers the entire crotch portion from the middle position in the up-down direction on the innermost surface. Therefore, the crotch side edge of the waist side folded part 21 and the waist side edge of the crotch side folded part 22 are aligned so that the waist side folded part 21 and the crotch side folded part 22 do not overlap each other ( Butt).
And as a result of having such a structure, as can be seen from the material lamination structure of the side seal portion 12A shown in FIG. 34 (b), the lamination of the sheet-like material 12 at the waist side end portion of the side seal portion 12A. The number, the number of the sheet-like material 12 laminated at the crotch side end, and the number of the sheet-like material 12 laminated at the intermediate portion between the waist side end and the crotch side end are all the same four sheets. Yes. Therefore, the entire side seal portion 12A can be uniformly bonded with an appropriate bonding strength. On the other hand, in the conventional type shown in FIG. 25, the number of laminated sheet-like materials 12 at the waist end is six, and the number of sheet-like materials 12 laminated at the crotch end is four. Uniform welding is difficult. Since others are the same as that of the first embodiment, the description will be omitted.

<Eighth form>
The eighth form is the form shown in FIG. 35, and is a form in which the same modification as the above-described second form is applied to the above-described seventh form. The parts not shown in FIG. 35 can be understood by referring to the drawings of the second embodiment and the seventh embodiment.
In the eighth embodiment, as can be seen from the material laminate structure of the side seal portion 12A shown in FIG. 35 (b), the number of laminated sheet-like breathable materials 12 at the waist side end portion of the side seal portion 12A, The number of sheet-like breathable materials 12 laminated at the crotch side end is the same (four), and the number of sheets of breathable material 12 laminated at the intermediate portion between the waist side end and the crotch side end is Less than that (two). Therefore, the joint strength of the sheet-like air-permeable material 12 at the waist side end portion and the crotch side end portion in the side seal portion 12A is substantially equal and the side seal portion is formed only by forming the side seal evenly in the side seal portion 12A. It becomes easy to make it the strongest in each part of 12A. The waist side end portion and crotch side end portion of the side seal portion are portions to which particularly strong force is applied during mounting and are portions to be a starting point or an end point of peeling, and an intermediate portion of the side seal portion 12A is a portion after use In peeling, smooth peeling is required (it is not preferable to be stronger than the starting point and the ending point). Therefore, when configured as described above, there is no unintended peeling of the side seal portion 12A during mounting. And it becomes easy to peel off after use. On the other hand, in the conventional type shown in FIG. 25, the number of sheet-like breathable materials 12 laminated at the waist end is six, and the number of sheet-like breathable materials 12 laminated at the crotch end is four. Therefore, it is difficult to obtain the above effects. Since others are the same as that of the 2nd form and the 7th form, explanation is omitted dare.

<Ninth Embodiment>
The ninth form is a form shown in FIGS. 36 and 37, and is a form in which the same modification as the above-described third form is applied to the above-described seventh form. Moreover, since the modified content is the same as that of the above-mentioned 3rd form, it uses the same code | symbol in a figure and abbreviate | omits description.

<Tenth embodiment>
The 10th form is a form shown by FIG.38,39, and is a form which applied the deformation | transformation similar to the above-mentioned 4th form with respect to the above-mentioned 7th form. Moreover, since the modified content is the same as that of the above-mentioned 4th form, it uses the same code | symbol in a figure and abbreviate | omits description. The illustrated example is a modification of the seventh embodiment, but can be applied to the eighth and ninth embodiments. Particularly, as in the ninth embodiment, the sheet-like breathable material of the

exterior sheets

12F and 12B is applicable. It is suitable when it is difficult to pinch between the two.

<Eleventh form>
The 11th form is a form shown by FIG.42 and FIG.21, and is a form which applied the deformation | transformation similar to the above-mentioned 5th form with respect to the above-mentioned 7th form. Moreover, since the modified content is the same as that of the above-mentioned 5th form, it uses the same code | symbol in a figure and abbreviate | omits description. The eleventh embodiment is particularly suitable when it is difficult to sandwich the interior body 200 between the sheet-like breathable materials 12 of the

exterior sheets

12F and 12B as in the ninth embodiment. Applicable to form.

<Twelfth embodiment>
The twelfth form is a form shown in FIG. 42, and is a form in which the same modification as the sixth form is applied to the seventh to eleventh forms. Moreover, since the modified content is the same as that of the above-mentioned 6th form, it uses the same code | symbol in a figure and abbreviate | omits description.

<Other forms>
In the first to sixth embodiments, the thin sheet portions 23 are provided on both the

exterior sheets

12F and 12B, respectively, but the thin layer portion 23 is provided only on one (for example, the back side) and not on the other. It is also possible. In such a configuration, when the thin layer portion 23 is provided only on the back side, the side seal portion 12A is pulled to the ventral side at least in the middle portion of the side seal portion. Is preferable because the lower end side of the side seal portion 12A is shifted to the back side during use and the bulge and the swell are less likely to occur in the buttock cover portion 14C.

It is a top view in the state where the diaper was developed showing the underwear type disposable diaper inner surface of the 1st form. It is a top view in the state where the diaper was developed showing the pants type disposable diaper outer surface of the 1st form. FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along the line 5-5 in FIG. It is a top view in the state where a diaper was developed showing only a principal part of a pants type disposable diaper of a 1st form with a size. It is sectional drawing which shows only the principal part of an underpants type disposable diaper with a dimension. It is a front view of the product state of a 1st form. It is a rear view of the product state of a 1st form. (A) The perspective view which shows roughly the diaper inner surface of the expansion | deployment state of a 1st form, (b) It is sectional drawing which shows the material laminated structure of a side seal part. It is a top view in the state where the diaper was developed showing the inside of the underwear type disposable diaper of the 2nd form. FIG. 6 is a sectional view taken along line 6-6 in FIG. (A) The perspective view which shows roughly the diaper inner surface of the expansion | deployment state of a 2nd form, (b) It is sectional drawing which shows the material laminated structure of a side seal part. It is a top view in the state where the diaper was developed showing the inside of the underpants type disposable diaper of the 3rd and 5th form. FIG. 17 is a 7-7 cross-sectional view of FIG. 14. It is a top view in the state where the diaper was developed showing the inner surface of the pants type disposable diaper of the 4th form. FIG. 8 is a sectional view taken along the line 8-8 in FIG. It is a top view in the state where the diaper was developed showing the diaper inner surface of the modification of the 1st form. It is a top view in the state where the diaper was developed showing the diaper outer surface of the modification of the 1st form. It is a top view in the state where the diaper was developed showing the underwear type disposable diaper inner surface of the 6th form. It is a top view in the state where the interior object was developed showing the inner surface of the interior object of the 6th form. FIG. 21 is a sectional view taken along the line 1-1 in FIG. 20. FIG. 21 is a sectional view taken along the line 2-2 in FIG. 20. FIG. 22 is a sectional view taken along line 9-9 of FIG. 21. (A) It is a perspective view which shows roughly the diaper inner surface of the expansion | deployment state of a conventional form, (b) It is sectional drawing which shows the material laminated structure of a side seal part. It is a photograph which shows a mounting state. It is a photograph which shows a mounting state. It is the schematic which shows the test procedure of a junction inclination test. It is a top view in the state where the diaper was developed showing the underwear type disposable diaper inner surface of the 7th form. It is a top view in the state where the diaper was developed showing the pants type disposable diaper outer surface of the 7th form. FIG. 30 is a sectional view taken along line 5-5 in FIG. 29. It is a front view of the product state of a 7th form. It is a rear view of the product state of a 7th form. (A) The perspective view which shows roughly the diaper inner surface of the expansion | deployment state of 7th form, (b) It is sectional drawing which shows the material laminated structure of a side seal part. (A) The perspective view which shows roughly the diaper inner surface of the expansion | deployment state of an 8th form, (b) It is sectional drawing which shows the material laminated structure of a side seal part. It is a top view in the state where the diaper was developed showing the inner surface of the pants type disposable diaper of the 9th form. FIG. 7 is a sectional view taken along line 7-7 in FIG. 36. It is a top view in the state where the diaper was developed showing the inner surface of the pants type disposable diaper of the 10th form. FIG. 39 is a cross-sectional view along 8-8 in FIG. 38. It is a top view in the state where the diaper was developed showing the diaper inner surface of the modification of the 7th form. It is a top view in the state where the diaper was developed showing the diaper outer surface of the modification of the 7th form. It is a top view in the state where the diaper was developed showing the underwear type disposable diaper inner surface of the 11th form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Girth part, 11 ... Liquid impervious sheet, 12F ... Abdominal side exterior sheet, 12B ... Back side exterior sheet, 200 ... Interior body, 21 ... West side folded part, 22 ... Crotch side folded part, 23 ... Separated part 25 ... front cover sheet, 26 ... rear cover sheet, 27 ... slit, 30 ... top sheet, 40 ... intermediate sheet, 50 ... absorbent element, 52 ... fiber, 54 ... superabsorbent polymer particles, 56 ... absorber, 58 ... Cover sheet, 60 ... Side barrier cuff, 62 ... Barrier sheet, 70 ... Back elastic sheet.

Claims

A cylindrical waistline formed by joining both sides of the ventral exterior sheet and both sides of the back exterior sheet;
An interior body that absorbs excrement, provided from the center in the width direction of the inner surface of the ventral exterior sheet to the center in the width direction of the inner surface of the back exterior sheet,
In the pants-type disposable diaper in which the ventral side exterior sheet and the back side exterior sheet are not continuous on the crotch side and are separated from each other,
The belly side exterior sheet and the back side exterior sheet have a waist side end, a waistline upper end, a waistline middle part, and a waistline lower end in order from the top in the same vertical range as the side seal part to be joined. And
At least one of the abdominal exterior sheet and the back exterior sheet; the waist side end portion and the waistline lower end portion are formed by bonding together a plurality of layers of sheet-like breathable materials, and between the sheet-like breathable materials The elastic elastic member is clamped and fixed in a state of being stretched along the width direction, and at least one of the upper part of the waistline and the middle part of the waistline is made of a single-layer sheet-like breathable material. Does not have adhesive to fix,
A pants-type disposable diaper characterized by that.
The waist-side end portion and the waistline lower end portion of the abdominal-side exterior sheet and the back-side exterior sheet are formed by laminating a plurality of layers of sheet-like breathable materials, and an elastic stretch member is provided between the sheet-like breathable materials. It is clamped and fixed in a stretched state along the width direction,
The waistline upper end portion of the ventral exterior sheet and the waistline middle portion of the backside exterior sheet are made of a single-layer sheet-like breathable material, and have an elastic stretch member and an adhesive for fixing the elastic stretch member. The underpants type disposable diaper of Claim 1 which is not.
The back-side exterior sheet has a back-side extending portion that extends below the same vertical range as the side seal portion, and the back-side extending portion overlaps the interior body in the width direction center. Part and a buttock cover part extending on both sides thereof,
The back extension part is formed by laminating a plurality of layers of sheet-like breathable material and a state in which an elastic elastic member extends along the width direction at least at the buttocks cover part between the sheet-like breathable materials It is pinched and fixed at
The contraction force in the width direction at the lower end of the waistline of the abdominal exterior sheet is stronger than the contraction force in the width direction of the lower end of the waistline and the back extension part of the backside exterior sheet,
The pants-type disposable diaper according to claim 2.
The waistline middle part of the ventral exterior sheet and the waistline upper end part of the backside exterior sheet are formed by laminating a plurality of layers of sheet-like breathable materials and elastic elastic members between the sheet-like breathable materials The underpants-type disposable diaper according to claim 3, wherein the pants-type disposable diaper is clamped and fixed while being stretched along the width direction.
The waistline middle part of the ventral exterior sheet and the waistline upper end part of the backside exterior sheet are made of a single-layer sheet-like breathable material, and have an elastic stretch member and an adhesive for fixing the elastic stretch member. The underpants type disposable diaper of Claim 3 which is not.
The side seal part inclination angle in the side seal part inclination test is 20 degrees or less,
The underpants-type disposable diaper according to claim 3.
The pants-type disposable diaper according to claim 2, wherein the front end portion and the rear end portion of the interior body are configured not to include a sheet material made of a film material or a paper material.
Of the side seal part, which is a part where both side parts of the abdominal side exterior sheet and both side parts of the back side exterior sheet are welded and joined, the number of sheet-like materials laminated at the waist side end part and the sheet form at the crotch side end part The number of laminated materials is the same, and the number of laminated sheet-like materials at the intermediate portion between the waist-side end portion and the crotch-side end portion is the sheet-like material at the waist-side end portion and the crotch-side end portion. The same or less than
The pants-type disposable diaper according to claim 2, wherein
The pants-type disposable diaper according to claim 8, wherein the welding joining is performed by ultrasonic welding.
The pants-type disposable diaper according to claim 9, wherein the side seal portion is formed in a line shape from an upper edge to a lower edge of a portion where both side portions of the ventral side exterior sheet and both side portions of the back side exterior sheet overlap. .