JP5106990B2 - Pants-type disposable diaper and stretchable part structure in disposable absorbent article - Google Patents

Description

  The present invention relates to a stretchable part structure in a pants-type disposable diaper and a disposable absorbent article.

For example, in a pants-type disposable diaper, as shown in FIGS. 1 and 2, shirring may be formed around the abdomen and waist as an expansion / contraction part in order to add a fitting function (see, for example, Patent Document 1). In this shearing, a plurality of elongated elastic members such as thread rubber are stretched between a plurality of breathable / water-repellent nonwoven fabrics constituting the exterior sheet, and the elastic member and the exterior sheet are made of hot melt or the like. It is formed by fixing with an adhesive.
As such a shearing formation method, an adhesive such as hot melt is applied to either the elastic member or the exterior sheet or both the elastic member and the exterior sheet online, and then the elastic member is sandwiched between the nips. It is common to fix by doing (for example, refer patent documents 2-4).
In addition, a technique for fixing an exterior sheet and an elastic member in a state of being mechanically sandwiched and crushed has been proposed (see Patent Document 5).
JP 2002-172132 A JP 2000-26015 A JP 2002-273808 A JP 2004-229857 A JP 2004-330777 A

However, in the conventional shearing, the entire elastic member is fixed so as not to move with respect to the exterior sheet. Therefore, although it fits to a wide range of waistline dimensions to a certain extent, tightening by the elastic member as the wearer's waistline is thicker There was a problem that the force worked strongly.
Then, the main subject of this invention is providing the technique which can adjust the fastening force of a waist circumference according to a wearer's body shape.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior sheet having at least a waistline portion and having a portion in which the inner layer and the outer layer are bonded to the waistline portion;
On the body side of this exterior sheet, an interior body that is provided along the center in the width direction and absorbs and holds an object;
Between the inner layer and the outer layer in the waist portion, a plurality of elongated elastic members are provided in parallel in a state of extending along the waist direction,
Wherein the inner and outer layers are each said joint being joined without going through each of said elongated elastic members at both sides in the width direction of the elongated elastic member is formed,
Each of the elongated elastic members is a pants-type disposable diaper that is sandwiched and fixed between a joint portion on one side in the width direction and a joint portion on the other side in the width direction,
Each said elongated elastic member has one end portion is immovable fixed to the outer sheet, the whole of the other end portion excluding the one end portion is movable relative to the outer sheet, the A portion located between the joint portions in the other end side portion is sandwiched and fixed in a state of being movable in the direction of the one end portion between the joint portions, and the entire other end side portion including the sandwich fixing portion is the stretching of the waist direction of the clamping fixing part and corresponding flex region of the section, a portion thereof by a distance corresponding to the decompression degree drawn into the one end side Rutotomoni, located between the junction of the other end portion Is configured to be sandwiched and fixed between the joints ,
When unfolded the waist portion during mounting, stretchable region extends at waistline portion, the whole of the other end portion of the elongated elastic member by a distance corresponding to the stretching degree is drawn at one end Rutotomoni, this The portion located between the joints in the other end side portion is sandwiched and fixed between the joints , so that the natural length of the waistline is expanded to fit the wearer's body shape, and the elongated shape at the time of wearing Configured to reduce the amount of extension of the elastic member,
A pants-type disposable diaper characterized by that.

(Function and effect)
The present invention basically has a structure in which an elongated elastic member is fixed to an exterior sheet by a frictional force by being sandwiched between joint portions of the inner layer and the outer layer on both sides in the width direction. In addition, in the present invention, one end portion of the elongated elastic member is fixed so as not to move with respect to the exterior sheet, and the sandwiched fixing portion between the joint portions of the other end portion excluding this one end portion is, The expansion and contraction region corresponding to the clamping and fixing portion in the waistline portion is stretched in the waistline direction so as to be pulled in and fixed to the one end side by a distance corresponding to the extension degree. In a diaper having such a structure, when the diaper girth is widened by hand during installation or when the diaper girth is widened by passing the diaper through the torso, the stretchable region in the girth part expands, depending on the degree of expansion. By expanding the natural length of the waistline (the length in the non-stretched state that is not stretched or stretched in the waistline direction) by utilizing the fact that the elongated elastic member is pulled into the one end side and fixed by a certain distance. The amount of expansion of the elongated elastic member during wearing can be reduced, and the tightening force (tensile stress) by the elongated elastic member can be weakened according to the body shape of the wearer. In addition, since the natural length of the waistline can be increased individually in the portions having the individual elongated elastic members, the tightening force around the waistline can be individually adjusted in the vertical portions.

<Invention of Claim 2>
The stretchability rate when the stretchable region is stretched from the unstretched state to the maximum stretched length and then returned to the non-stretchable state is 0.6 to 0.95 times the stretchable rate of the stretchable region in the unstretched state. The underpants type disposable diaper of Claim 1 comprised as follows.

(Function and effect)
The extent to which the elongated elastic member is drawn by the extension of the waistline portion can be determined as appropriate, but in the usual case, the extent described in this section is preferable. Here, the stretchable ratio means the ratio of the maximum stretch length of the stretchable region to the natural length of the stretchable region, and is expressed by the following formula (1). The natural length of the stretchable area means the length in the waistline direction when the stretchable area is not stretched or stretched in the waistline direction, and the maximum stretched length of the stretchable area is in the waistline direction. It means the length of the stretched state to the maximum, and is equal to the material length in the waistline direction of the exterior sheet in the stretchable region.
Stretchable rate = maximum length / natural length x 100 (1)

<Invention of Claim 3>
The waistline portion is a non-stretchable region in which the center portion in the width direction does not have the clamping and fixing portion, and both side portions located on both sides in the width direction of the non-stretchable region are the stretchable regions,
The elongated elastic member in each stretchable region extends from the widthwise outer end of each stretchable region to the widthwise center end, and the widthwise outer end of each stretchable region is the exterior sheet. Fixed against immovable,
The pants-type disposable diaper according to claim 1 or 2.

(Function and effect)
In a pants-type disposable diaper, a configuration in which a central portion in the width direction is set as a non-stretchable region and the both sides thereof as stretchable regions by cutting an elongated elastic member at a portion of the waistline that overlaps the interior body is common. ing. When the pull-in structure of the elongated elastic member of the present invention is applied to such a form, it is preferable to adopt a structure as described in this section. As described in this section, the elongated elastic member in each stretchable region extends from the widthwise outer end to the widthwise center end in each stretchable region, and the widthwise outside in each stretchable region. When the end portion is fixed so as not to be movable with respect to the exterior sheet, each elongated elastic member is drawn from the center in the width direction toward the outer end when the stretchable region is extended when the diaper is attached ( Shift). Further, since the end portion in the width direction center side of the elongated elastic member is positioned in the stretchable region and withdrawn the elongated elastic member in this order from the junction portion located at the width direction center side, stretchable region width ( The width of the sandwiched and fixed portion of the elongated elastic member is narrowed. As a result, in the invention described in this section, not only the stretchability rate of the stretchable region but also the length of the stretchable region in the waistline direction is shortened, the natural length of the waistline is expanded, and the elongated elastic shape when worn The tightening force by the member can be weakened according to the body shape.

<Invention of Claim 4>
The waistline portion is a non-stretchable region in which the center portion in the width direction does not have the clamping and fixing portion, and both side portions located on both sides in the width direction of the non-stretchable region are the stretchable regions,
The elongated elastic member in each stretchable region extends from the outer end in the width direction in each stretchable region through the end on the center side in the widthwise direction into the non-stretchable region, and in the width direction in each stretchable region. The outer end is fixed so as not to move with respect to the exterior sheet,
The pants-type disposable diaper according to claim 1 or 2.

(Function and effect)
As in the invention described in the preceding paragraph, if the end of the elongated elastic member in the center in the width direction is positioned in the expansion / contraction region and the reduction of the expansion / contraction region is also used, the tightening force can be reduced, but the elongated elastic member is pulled out. As a result, the fit to the body surface shape of the portion that has become a non-stretchable region is reduced. The invention described in this section solves this problem. As described in this section, the elongated elastic member in each stretchable region extends from the widthwise outer end of each stretchable region through the widthwise central end to the non-stretchable region, When the end portion on the outer side in the width direction in the stretchable region is fixed so as not to move with respect to the exterior sheet, when the stretchable region is stretched when the diaper is attached, each elongated elastic member is moved to the outer end from the widthwise center side. It is drawn (shifted) towards the part. At this time, when the end portion in the width direction center side of the elongated elastic member is protruded to the non-stretchable regions, because they are reserved in advance as the pull-margin this projecting portion, while stretching the region of the elongated elastic member Even if the part that is positioned is pulled from the center in the width direction toward the outer edge, the part that is positioned in the non-stretchable area is pulled into the stretchable area and fixed between the joints. Will be maintained. As a result, in the invention described in this section, the natural length of the waistline is expanded only by the stretchable rate of the stretchable region without narrowing the width of the stretchable region (the width of the sandwiched and fixed portion of the elongated elastic member), The tightening force by the elongated elastic member can be weakened according to the body shape.

<Invention of Claim 5>
In the stretchable part structure in the disposable absorbent article, which is provided between the inner layer and the outer layer in a state where the elongated elastic member is stretched along its longitudinal direction,
Wherein the inner layer and the outer layer, the provided joints are joined without interposition of said elongated elastic members at both sides in the width direction of the elongated elastic member is formed,
The elongated elastic member is sandwiched and fixed between a joint portion on one side in the width direction and a joint portion on the other side in the width direction,
It said elongated elastic member has one end portion is immovable fixed to the outer sheet, the whole of the other end portion excluding the one end portion is movable relative to the outer sheet, the other A portion located between the joint portions in the end side portion is sandwiched and fixed in a state of being movable in the direction of the one end portion between the joint portions, and at the time of mounting, the whole of the other end side portion including the sandwich fixing portion is Due to the extension of the elongated elastic member in the longitudinal direction of the expansion / contraction region corresponding to the clamping and fixing portion, the entire other end side portion of the elongated elastic member is drawn to the one end side by a distance corresponding to the degree of extension. Rutotomoni, the portion located between the joint portions in the other end portion is sandwiched and fixed between the joint portion, thereby to fit the body type of the wearer, you the clamping fixing part of the elongated elastic member The natural length of the longitudinal direction of the elongated elastic member while expanding, the expansion amount of said elongated elastic member at the time of mounting is configured to reduce that,
A stretchable part structure in a disposable absorbent article.

(Function and effect)
As described in this section, the adjustment of the natural length by pulling in the elongated elastic member of the present invention described above is applied not only to the shirring of the pants-type disposable diaper but also to the stretchable part structure in other disposable absorbent articles. Can do. For example, it can be applied not only to stretchable parts such as barrier cuffs and gasket cuffs in pants-type paper diapers, but also to waist gathers, barrier cuffs, gasket cuffs, gasketed cuffs, stretchable tapes, etc. of tape-type paper diapers. It can also be applied to stretchable parts such as barrier cuffs and gasket cuffs in general absorbent articles.

  As described above, according to the present invention, there are advantages that the tightening force around the waist can be adjusted according to the body shape of the wearer.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 9 show a pants-type disposable diaper according to the present invention. This pants-type disposable diaper has an abdominal exterior sheet 12F that covers the abdominal side of the wearer's waist and a back exterior sheet 12B that covers the dorsal side, on both side edges in the width direction of the abdominal exterior sheet 12F. The joining portion 12A and the joining portions 12A on both side edges in the width direction of the back exterior sheet 12B are joined by heat sealing, ultrasonic welding, or the like to form the cylindrical waistline portion 100. When the backside exterior sheet 12B extends below the joining portion 12A as in the illustrated embodiment, the backside sheet is subjected to processing such as heat sealing integrally in the vertical range including up to this portion. An extended joint portion 12E can be provided in the extended portion 14. In the present embodiment, the end portions on the outer side in the width direction of the respective elongated elastic members 15 to 19 to be described later are fixed to the exterior sheets 12F and 12B so as not to move by the joint portion 12A and the extended joint portion 12E. .
In addition, the front end portion of the interior body 200 is connected to the inner surface of the belly side exterior sheet 12F in the width direction center portion of the waistline portion 100 by a hot melt adhesive or the like, and the interior body is disposed on the inner surface of the back side exterior sheet 12B in the width direction center portion. The rear end portions of 200 are connected by a hot melt adhesive or the like. In the illustrated example, the ventral-side exterior sheet 12F and the back-side exterior sheet 12B are not continuous on the crotch side and are separated from each other, but may be integrated without being separated. In the case of separation, the separation distance Y can be about 150 to 250 mm.

  As can be seen from FIGS. 8 and 9, 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 joint 12A is peeled off and developed, an hourglass shape is formed as shown in FIG. The interior body 200 extends from the back side through the crotch part to cover the abdomen side, and is a part that receives the excrement and absorbs and retains the liquid. This is the part that supports the wearer.

(Exterior sheet)
The abdominal exterior sheet 12F and the back exterior sheet 12B are formed by laminating an inner sheet (inner layer) 1A and an outer sheet (outer layer) 1B made of nonwoven fabric as shown in FIGS. In order to improve the fit to the belt, elongated elastic members 15 to 19 such as rubber thread are fixed between the sheets 1A and 1B in a stretched state along the waistline direction.

Nonwoven fabrics can be suitably used as the inner sheet 1A and the outer sheet 1B. 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 spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. The basis weight of the nonwoven fabric is preferably about 10 to 30 g / m ² . Sheets 1A and 1B are not limited to non-woven fabrics, and any film made of polyethylene resin or the like can be used as long as it can be fixed by thermal welding or ultrasonic welding, or a combination of non-woven fabric and film can be used. it can.

As each of the elongated elastic members 15 to 19, a known material can be used as long as it has elasticity and can be fixed in a tensioned state with the surrounding nonwoven fabric. Materials include natural rubber, polyurethane, block polyether amide, block polyether ester, polyurethane urea, elastic polyolefin, thermoplastic styrene-butadiene-styrene (SBS), styrene-isoprene-styrene, styrene-ethylene / propylene-styrene, Styrene-ethylene-butadiene-styrene (SEBS), hydrogenated styrene-butadiene-rubber and elastomers based on these and other polymers such as polystyrene or polyolefins can be used. Also, elastic yarns from segmented polyester or polyether urethane-urea can be used. The thickness of the elastic member 2 can be set arbitrarily. Further, the cross-sectional shape is not limited to a circle, but can be freely selected from an ellipse, a rectangle, and other geometric shapes.
More specifically, the back-side exterior sheet 12B includes a back-side main body portion 13 that occupies the same vertical range as the joint portion 12A, and a back-side extension portion 14 that extends below the back-side main body portion 13. Have. 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, but in the illustrated example, the upper end of the dorsal extension 14 has the same width as the dorsal body 13 and extends below the dorsal body 13. The width is narrowed as the lower side approaches the crotch side. A portion having the same width as that of the back-side main body 13 can be omitted. If comprised in this way, the edge 14e of the width direction outer side 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, and it is easy to cover a buttock part. It becomes a shape.
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 edge 14e on the width direction outer side of the collar part cover part 14C and the inner body 200) More preferably, the maximum distance in the width direction with respect to the side edge is 80 to 160 mm, and the length 14y (extension length) in the vertical direction of the collar cover portion 14C is 30 to 80 mm. Further, assuming that the area of a quadrangle determined by the widest part in the width direction and the widest part in the vertical direction is S, the area of the back side extension part 14 is 20 to 80% of S, In particular, it is preferable that the content is about 40 to 60% because the outer appearance and wearing feeling of the buttocks are excellent.

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.
A plurality of back-side waist elastic members 17 are vertically spaced at the upper end portion (waist portion) W of the back-side main body portion 13 at a predetermined extension rate so as to be continuous over the entire width direction. It is fixed in a stretched state along the direction. Further, in the lower portion U of the back-side main body 13, a plurality of first elongated elastic members are provided so as to be continuous over the entire width direction of each portion with respect to the width direction center with respect to the center in the width direction. The members 15 are fixed in a state where they are stretched along the width direction at a predetermined stretch rate with a space in the vertical direction. Further, in the back-side extending portion 14, a plurality of second elongated elastic members 16 are vertically arranged so as to be continuous over the entire width direction of each portion with respect to the center in the width direction. It is fixed in a state of being stretched along the width direction at a predetermined stretch rate with a gap in the direction.

On the other hand, the abdominal exterior sheet 12F is composed of only the abdominal body part basically the same as the back body part 13 of the back exterior sheet 12B (the part occupying the same vertical range as the joint part 12A). It has a rectangular shape extending along the direction, and does not have the back side extension portion 14 like the back side exterior sheet 12B. That is, among the upper end portion (waist portion) W and the lower portion U of the ventral side exterior sheet (abdominal side main body portion) 12F, the upper end portion W has a plurality of ventral side waist portions so as to be continuous over the entire width direction. The elastic members 18 are fixed in a state where they are stretched along the width direction at a predetermined stretch rate with an interval in the vertical direction. Further, in the lower portion U of the abdominal exterior sheet 12F (abdominal side main body portion), except for the widthwise central portion overlapping with the interior body 200, it is continuous over the entire width direction on each of the upper side and both sides in the width direction. As described above, the plurality of third elongated elastic members 19 are fixed in a state of being spaced apart in the vertical direction and stretched along the width direction at a predetermined stretch rate. Although the vertical disposition range of the third elongated elastic member 19 may be a part of the lower portion, it is preferable that the third elongated elastic member 19 is substantially the whole (a range in which a stretching force acts on the whole).
In the illustrated example, the first to third elongated elastic members 15, 16, 19 are attached over the entire width direction of the abdominal and dorsal exterior sheets 12 F, 12 B to release the entire extension force. The outer sheets 12F and 12B are loosened, that is, the elastic members 15, 16, and 19 are cut along the center line CL in the width direction of the diaper in a non-stretched state in which the sheet is neither stretched nor contracted. In the figure, the elastic members 15, 16 and 19 on both the left and right sides face each other at the center of the diaper in the width direction, and there is almost no gap between them, but the cutting ends of the elastic members 15, 16, and 19 are released from the stretching force. By moving a predetermined distance, an appropriate interval (for example, the width of the portion overlapping the interior body 200) can be formed between the elastic members 15, 16, and 19 on both the left and right sides.

The thickness of each of the elongated elastic members 15 to 19 can be determined as appropriate, but the waist elastic members 17 and 18 are about 155 to 1880 dtex, especially about 470 to 940 dtex (in the case of synthetic rubber. The area is preferably 0.05 to 1.5 mm ² , particularly about 0.1 to 1.0 mm ^{2. In} the first to third elongated elastic members 15, 16 and 19, the thickness is 155 to 1880 dtex, especially about 470～940Dtex (the case of synthetic rubber. cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular 0.1~1.0mm about ²⁾ preferably with.

  Although the number and interval of each of the elongated elastic members 15 to 19 can be determined as appropriate, it is preferable to provide about 3 to 22 waist elastic members 17 and 18 at intervals of 4 to 12 mm. The member 15 and the third elongated elastic member 19 are preferably provided in an interval of 1 to 15 mm, particularly 3 to 8 mm, and preferably 5 to 30, and the second elongated elastic member 16 is 5 to 40 mm, particularly 5 to 20 mm. It is preferable to provide about 2 to 10 at intervals of.

Characteristically, the inner sheet 1 </ b> A and the outer sheet 1 </ b> B are joined to the first to third elongated elastic members 15, 16, 19 on both sides in the width direction without sandwiching the elastic members to form the joint portion 3. The elastic members 15, 16, and 19 are sandwiched between the joint portion 3 on one side in the width direction and the joint portion 3 on the other side in the width direction, and are fixed only by frictional force. Therefore, when the first to third elongated elastic members 15, 16, 19 are extended in the longitudinal direction and the frictional force against both the sheets 1A, 1B is reduced by reducing the diameter, the first to third When the elastic contraction force of the elongated elastic members 15, 16, 19 exceeds the frictional force, the first to third elongated elastic members 15, 16, 19 are released from the inner sheet 1A and the outer sheet 1B and contract. Move (that is, pull in occurs). Therefore, this pull-in is designed by designing in advance so that such pull-in occurs properly when the diaper girth is spread by hand or when the diaper is spread by passing the diaper through the torso. By utilizing the phenomenon, by expanding the natural length of the waistline (the length in the non-stretched state that is not stretched or stretched in the waistline direction), the amount of stretch of the elastic members 15, 16, 19 at the time of wearing is reduced, The tightening force (tensile stress) by the elastic member can be weakened according to the wearer's body shape. The fixing structure by the joint portion 3 will be described in detail in the section of the manufacturing method.
In particular, in the present embodiment, in each of the abdominal exterior sheet 12F and the back exterior sheet 12B, the widthwise central portion (the region where the interior body 200 and the exterior sheets 12F and 12B overlap) does not have the joint portions 3 and 3. In addition to the non-stretchable region X2, both side portions located on both sides in the width direction of the non-stretchable region X2 are stretchable regions X1 corresponding to the sandwiched and fixed portions of the elastic members 15, 16, 19 between the joint portions 3, 3. ing.

In the form shown in FIG. 12, the elastic members 15, 16, 19 are cut in the vicinity of the boundary between the stretchable region X1 and the non-stretchable region X2, and the elastic members 15, 16, 19 in each stretchable region X1 are at the outer ends in the width direction. Since only the portion is fixed so as not to be moved by the joint portion 12A and the extended joint portion 12E, each elastic member 15, 16, 19 is drawn (shifted) from the center side in the width direction toward the outer end portion. Therefore, when the elastic members 15, 16, and 19 of each stretchable region X1 extend only from the widthwise outer end of each stretchable region X1 to the widthwise center end, The elastic members 15, 16, and 19 are sequentially pulled out from between the joint portions 3 and 3 located on the center side in the width direction, and the width of the stretchable region X1 (the width of the clamping and fixing portion of the elastic members 15, 16, and 19) is reduced. As a result, not only the stretchable ratio of the stretchable region X1 but also the length of the stretchable region X1 in the waistline direction is shortened, so that the natural length of the waistline is expanded, and due to the elastic members 15, 16, 19 at the time of wearing The tightening force can be weakened according to the body shape.

  However, in this case, the portion that has become the non-stretchable region X2 due to the extraction of the elastic members 15, 16, and 19 is less fit to the body surface shape, so the configuration shown in FIGS. 8 and 9 or the configuration shown in FIG. As described above, the elastic members 15, 16, and 19 of each stretchable region X1 are cut inside the non-stretchable region X2, and are not passed from the widthwise outer end of each stretchable region X1 through the widthwise center end. It is preferable that it extends to the expansion / contraction region X2 (for example, to the center of the diaper in the width direction). In this case, as shown in FIG. 11, portions of the elastic members 15, 16, and 19 that protrude into the non-stretchable region X <b> 2 are secured in advance as a pull-in allowance, and the elastic members 15, 16, and 19 are secured. Even if the portion located in the stretchable region X1 is drawn from the center in the width direction toward the outer end, the portion located in the non-stretchable region X2 is drawn into the stretchable region X1 and between the joints 3 The length of the stretchable region X1 is maintained by being sandwiched and fixed. Therefore, the natural length of the waistline is expanded only by the stretchable rate of the stretchable region X1, while preventing the fit from being reduced due to the reduction in the width of the stretchable region X1, and the tightening force by the elastic members 15, 16, 19 at the time of wearing is increased. It can be weakened to match. 11 and 12 show a state where the waistline portion of the diaper is stretched to retract the elastic members 15 to 19 and then the waistline stretch is released and contracted.

  Moreover, the edge part of the width direction outer side of the 1st-3rd elongate elastic member 15,16,19 is with respect to the exterior sheets 12F and 12B mentioned later by the junction part 12A and the extension junction part 12E in this embodiment. However, it can also be fixed separately using a hot melt adhesive or the like. In this case, the fixed width in the waistline direction can be increased, and a portion where no pull-in occurs can be formed in a part of the stretchable region X1. For example, the elastic member 15, 16, 19 is configured to be retracted in the stretchable region X1 located within a range of 70 mm on the left and right from the center in the width direction of the diaper, and the elastic members 15, 16, 19 are hot on the left and right sides. It can be configured to be fixed with a melt adhesive or the like so as not to be pulled in.

  On the other hand, the waist elastic members 17 and 18 are fixed between the inner sheet 1A and the outer sheet 1B by a known means such as a hot melt adhesive in a state of being stretched at a predetermined stretch rate. The pulling-in unlike the elongated elastic members 15, 16, and 19 does not occur. Of course, also about the waist part elastic members 17 and 18, the fixing structure similar to the 1st-3rd elongate elastic members 15, 16, and 19 can also be employ | adopted about the one part or all part. Thus, the elastic member in which the pull-in of the present invention occurs can be a part of the plurality of elastic members.

  The stretchable ratio of the portion provided with each of the elongated elastic members 15 to 19 can be determined as appropriate. The stretchable ratio can be adjusted depending on how much the elastic members 15 to 19 are fixed to the inner sheet 1A and the outer sheet 1B. In a normal case, the stretchable rate of the waist W is preferably 150 to 400%, particularly about 220 to 320%. On the other hand, the stretchable ratio of the portion having the first elongated elastic member 15 is preferably 200 to 350%, particularly about 240 to 300% in the unstretched state (unused state). The portion having the member 16 is preferably 150 to 300%, particularly about 180 to 260% in an unstretched state, and the stretchable rate of the portion having the third elongated elastic member 19 is in an unstretched state (unused state) ) Is preferably 150 to 350%, particularly preferably about 180 to 300%.

  In the first to third elongated elastic members 15, 16, and 19, the amount of stretch around the waist and the amount of pull-in required for the pull-in can be determined as appropriate, but the stretchable region X1 is maximized from the unstretched state. The stretchable rate when the stretched length is returned to the non-stretched state after being stretched to the stretched length is 0.6 to 0.95 times, preferably 0.7 to 0.9 times that of the stretchable region X1 in the unstretched state. It is preferable that it is comprised so that. The rate of change of the stretchable ratio before and after stretching depends on the material and thickness of the elastic members 15, 16, and 19, the material and basis weight, thickness of the inner sheet 1 </ b> A and outer sheet 1 </ b> B, and the interval and pattern of the joint 3. It can be adjusted by changing. More specifically, in the case where the nonwoven fabric in the range exemplified above is used as the inner sheet 1A and the outer sheet 1B, the first to third elongated elastic members 15, 16, 19 are thick in the range exemplified above. When the length is fixed so that the stretchable rate is in the range exemplified above, the interval 3d between the joint portions 3 on both sides of the first elongated elastic member 15 is the width of the elastic member in the non-expanded state. (The thread diameter in the case of rubber thread) is about 0.46 to 0.52 times, and the distance 3d between the joint portions 3 on both sides of the second elongated elastic member 16 is the width of the elastic member (thread) In the case of rubber, the thread diameter is about 0.50 to 0.58 times, and the interval 3d between the joint portions 3 on both sides of the third elongated elastic member 19 is the width of the elastic member in the non-stretched state (the length of the thread rubber). If the thread diameter is 0.46 to 0.58 times the case, the above range can be extended. It is possible to achieve stretching rate of change before and after.

  On the other hand, when these elastic members 15, 16, and 19 extend over a wide range to some extent, as shown in FIGS. 8 and 9, the joint portions in the longitudinal direction (MD direction) of the elastic members 15, 16, and 19 are used. 3 are intermittently provided (that is, the basic region 44 composed of a large number of joints 3 formed at the above-described arrangement / interval and the interval expansion region 45 are provided as elastic members 15, 16). , 19 are alternately formed in the longitudinal direction (MD direction), and the stretchability is improved and the area of the joint portion 3 is reduced, so that a softer texture and higher air permeability can be obtained.

  In the form having the gap expansion region 45, when a large number of elastic members 15, 16, and 19 are arranged side by side, the longitudinal direction (MD direction) position of the fixed portion by the joint portion 3 of each elastic member 15, 16, and 19 is different. The wrinkles formed by the contraction of the elastic member 2 become irregular, and an uneven surface having a poor appearance is formed. Therefore, as shown in FIGS. 6 and 9, it is preferable to align the positions of the fixed portions by the joint portions 3 in the longitudinal direction (MD direction) of the elastic members 15, 16, and 19. Specifically, the elongated basic group region 44 that vertically cuts the elastic members 15, 16, and 19 arranged side by side and the gap expansion region 45 that vertically cuts the elastic members 15, 16, and 19 arranged side by side are elastic members. They are formed alternately in the longitudinal direction (MD direction) of 15, 16, and 19. As a result, a beautiful shirring of the kites is formed. The width of the basic region 44 (the distance between the centers of the joint portions 3 located at both ends) W44 is preferably about 2 to 10 mm, and more preferably about 3 to 5 mm. The center distance DCT between adjacent basic regions 44 is preferably about 5 to 20 mm. Furthermore, it is more preferable that the relationship of DCT / 2 ≧ W44 is satisfied.

With such a configuration, not only the texture and air permeability are improved, but also regularly formed ridges are used as a mark for knowing the degree of pulling of the elastic members 15, 16, and 19. Is possible. In particular, as in the form shown in FIG. 12, the elastic members 15, 16, and 19 are cut so that the cut end portion is located in the vicinity of the boundary between the stretchable region X1 and the non-stretchable region X2 before being stretched. Since the starting position of the pull-in is easy to understand, the degree of the pull-in can be easily and accurately grasped. Further, as in the embodiment shown in FIG. 11, even when the elastic members 15, 16, 19 of each stretchable region X <b> 1 are cut inside the non-stretchable region X <b> 2, the elastic members 15, 16 are in a state before stretching. , 19 is marked at a position near the boundary between the stretchable region X1 and the non-stretchable region X2, the extent of the pull-in can be easily and accurately grasped. As a method for applying a mark, for example, a method is used in which printing is performed on the outer surface of the upper exterior sheets 12F and 12B with the elastic members 15, 16, and 19 interposed therebetween, and the ink penetrates and the elastic member is marked. it can. In this case, the printing pattern is preferably printed on the boundary line between the stretchable region X1 and the non-stretchable region X2 or in parallel with the boundary line with ink or the like. Alternatively, since both the outer sheet 1B and the elastic members 15, 16, and 19 are marked, it is possible to know the degree of pull-in by the printing deviation between the sheet and the elastic member even as a printing pattern made of figures or patterns. .
In addition, as shown in FIG. 10, the basic region 44 can be continuously provided over the entire longitudinal direction (MD direction) of the elastic members 15, 16, 19 without providing the gap expansion region 45.

(Method of fixing elastic member in exterior sheet)
The fixing structure of the first to third elongated elastic members 15, 16, 19 described above can be formed by, for example, the apparatus shown in FIG. 13. That is, FIG. 13 shows an example of an expansion / contraction part forming apparatus. The ultrasonic vibration source 5, the horn 6 connected to the ultrasonic vibration source 5 and increasing the vibration amplitude from the ultrasonic vibration source 5, and this And an anvil roll 7 disposed to face the horn 6. The ultrasonic vibration source 5 is fixed to a pressure arm (not shown), and the height can be adjusted. Further, before and after the anvil roll 7, guide rolls 8 and 9 for preventing slack of the continuous sheet 4 are disposed. The continuous sheet 4 includes a plurality of elastic members 2, 2... Arranged in parallel between the inner sheet (inner layer) 1 </ b> A and the outer sheet (outer layer) 1 </ b> B (the first to third elongated elastic members described above). (Corresponding to 15, 16, and 19) is passed between the horn 6 and the anvil roll 7. In the figure, the inner sheet 1A is located at the upper part and the outer sheet 1B is located at the lower part. However, the inner sheet 1A may be located at the lower part and the outer sheet 1B may be located at the upper part.

  As shown in FIG. 14, a plurality of projections 7A, 7A... That become ultrasonic welding surfaces are formed on a part of the outer peripheral surface of the anvil roll 7, and between these projections 7A, 7A. A groove having a predetermined depth is formed. When the continuous sheet 4 is passed between the horn 6 and the anvil roll 7, as shown in FIGS. 14 and 15, the horn 6 and the projection 7 </ b> A of the anvil roll 7, near both ends in the width direction of the elastic member 2. The inner sheet 1A and the outer sheet 1B are sandwiched and welded (this welded portion corresponds to the joint portion of the present invention, and hereinafter, the joint portion 3 and a region where the weld portion is formed is referred to as a joint region. The inner sheet 1A and the outer sheet 1B are not welded in the groove portion formed between the protrusion 7A and the protrusion 7A, and the elastic member 2 is not fixed between the two sheets in the groove. become. Since the elastic member 2 is housed in the groove, the elastic member 2 under tension is not sandwiched between the protrusion 7 and the horn 6. Thereby, on this continuous sheet 4, the joining area | region corresponding to the expansion-contraction area | region X1 and the non-joining area | region corresponding to the non-expansion-contraction area | region X2 are formed.

  Subsequently, after relaxing the continuous sheet 4 and releasing the tension of the elastic member 2, as shown in FIG. 18, a non-stretchable region X2 (non-joined region) located between the stretchable regions X1 (joined region). The elastic member 2 is cut. As shown in FIG. 15, when the elastic member 2 is cut and released when the continuous sheet 4 is not slack and the elastic member 2 is tensioned (no tension), as shown in FIG. 2 is stretched in the process of pulling in while expanding in diameter by contraction, and is sandwiched from both sides in the width direction by the joint portion 3 between the inner sheet 1A and the outer sheet 1B, and is fixed so as not to be pulled further. If the elastic member 2 is cut in a state where the continuous sheet 4 is relaxed and contracted together with the inner sheet 1A and the outer sheet 1B as shown in FIG. Then, if the sheet is stretched to an appropriate degree after cutting, the elastic member 2 is pulled in and fixed by a distance corresponding to the degree of expansion. Thereby, the elastic sheet which can reduce the expansion | extension amount as needed at the time of use and can weaken the clamping force by an elastic member is obtained. Furthermore, when the elastic member 2 is sandwiched and fixed between the joint portions 3 and 3 in this way, the elastic member 2 is fixed only by the frictional force with the inner and outer sheets 1A and 1B without using an adhesive. As a result, deterioration of the elastic member 2 due to the adhesive can be prevented. Furthermore, since the elastic member 2 is not bonded, air permeability and softness can be improved. Furthermore, since the material itself is melted and bonded, the fluctuation cost of hot melt can be reduced, and machine troubles caused by hot melt can be prevented. Similar advantages can be obtained by using heat welding by heat embossing instead of ultrasonic welding.

  In the form shown in FIG. 18, it is assumed that the range corresponding to the non-stretchable region is cut by heat embossing with a large number of fine protrusions. A method of partially making a large number of fine cuts can also be employed. Since such a cutting method of the elastic member 2 is a known method as shown in Patent Document 3, detailed description thereof is omitted. When the elastic member 2 is cut by heat embossing with such fine convex portions, the sheets 1A and 1B are bonded to each other by heat embossing for cutting the elastic member 2 at the non-stretchable portion. Since it is made by welding for sandwiching and fixing the elastic member 2 in the region, it is not particularly necessary to use an adhesive in the stretchable region and the non-stretchable region. However, in consideration of the moving distance due to the drawing of the end of the cut elastic member 2, if a middle region is provided between the arrangement range of the joint 3 and the cutting site, the drawing allowance can be secured, The forms shown in FIGS. 8 and 9 and the forms shown in FIGS. 10 and 11 can be manufactured. In this case, it is preferable to use a method in which heat embossing is performed with one or a plurality of ridges at the center of the non-stretchable portion as shown in Patent Document 2.

  In the above manufacturing method, the distance 7cd between the protrusion 7A in the width direction (axial direction) of the anvil roll 7 and the protrusion 7A is equal to the distance 3d between the joint portions 3 on both sides in the width direction of the elastic member 2, and FIG. As shown, it is made wider than the width (cross-sectional outer diameter) 2w of the elastic member 2 in the stretched state in which tension is applied in the longitudinal direction.

  In the above example, the projection 7A is provided only in the region corresponding to the stretchable region X1, but the projection 7A is also provided in the region corresponding to the non-stretchable region X2, and the inner sheet 1A and the outer sheet 1B are welded and fixed. Also good. However, in this case, in the region corresponding to the non-stretchable region X2, if the distance between the protrusion 7A and the protrusion 7A is not wider than the width (cross-sectional outer shape) 2w of the loose elastic member 2, the non-stretchable The elastic member 2 is also fixed in the region X2, which is not desirable.

  The groove between the projections 7A, 7A... Is for accommodating the elastic member 2 so that the elastic member 2 is not sandwiched between the projections. Therefore, the interval between the adjacent grooves coincides with the arrangement interval between the adjacent elastic members 2, 2... In the continuous sheet 4, and the groove width is wider than the width of the elastic member 2 in the stretched state. Further, the depth of the groove between the protrusions 7A, 7A... (The height of the protrusions 7A to 7C) may be a depth that allows the elastic member 2 to be accommodated and a depth that does not allow the continuous sheet 4 to sag excessively. It is desirable that the dimensions be similar to the groove width. Specifically, the depth of the groove is preferably 0.9 to 1.2 times the outer diameter of the cross section of the stretched elastic member 2. The most preferable range is 1.0 to 1.1 times. If it is smaller than 1.0 times, the force for holding the elastic member 2 becomes strong, but the entire elastic member 2 may be welded. Moreover, it is not preferable that the depth of the groove is larger than the outer diameter of the cross section of the elastic member 2 when not stretched. When the sheets 1A and 1B have the property of being easily distorted in the CD direction (axial direction of the anvil roll) like a nonwoven fabric, if the groove is too deep, the sheets 1A and 1B are stretched and distorted during pinching, There is a possibility that sufficient force to sandwich the elastic member 2 cannot be obtained.

  It is sufficient that the elastic member 2 has an expansion rate before fixing that is higher than that of the fixed state. Considering the distance in the CD direction of the joint 3 and the width of the elastic member 2, how much friction force is exerted on the elastic member 2. Although it can be determined as appropriate depending on whether it is to be exhibited, in the normal case, it is preferably about 1.1 to 1.5 times the stretch rate in the fixed state.

  The arrangement of the protrusions is not limited to the lattice shape, and may be a staggered array of protrusions 7C as shown in FIG. Moreover, if the distance (groove width) 7cd between the protrusions 7A to 7C and the protrusions 7A to 7C is within the above range with respect to the cross-sectional outer diameter of the elastic member 2 in the stretched state, the protrusions 7A to 7A of the anvil roll 7 will be described. The array pattern of 7C is not limited to a lattice shape or a zigzag shape, and may be another pattern.

  The shape of each of the protrusions 7A to 7C is circular in the illustrated example, but may be a polygon such as a triangle or a quadrangle, or a pattern such as an ellipse, a star, or a heart. If a shape without corners such as a circle or an ellipse is used, a soft texture can be obtained.

  The distance 7 md between the protrusions 7 </ b> A to 7 </ b> C in the MD direction (the circumferential direction of the anvil roll, the longitudinal direction of the elastic member 2) can be determined as appropriate depending on how much friction force is exerted on the elastic member 2. -7C may be continuous in the MD direction in a strip shape (linear shape). Further, the distance 7 cd in the CD direction between the protrusions 7 </ b> A to 7 </ b> C may be appropriately determined depending on how much friction force is exerted on the elastic member 2 in consideration of the width of the elastic member 2. The sizes of the protrusions 7A to 7C can be appropriately determined according to the interval and shape of the protrusions.

  When the arrangement of the protrusions 7A to 7C is the above-described lattice arrangement, the protrusions 7A to 7C are located on both sides in the width direction at the same portion in the longitudinal direction of the elastic member 2, so that a high clamping force is obtained. However, there is a high possibility that the elastic member 2 is welded or cut. On the other hand, when the zigzag arrangement is used, the possibility that the elastic member 2 is welded or cut decreases, but the clamping force also decreases. In the staggered arrangement, the rows of protrusions arranged in the MD direction at a predetermined periodic interval are provided with a predetermined interval in the CD direction, and the phase of the arrangement period of the protrusions in each row is shifted from the adjacent row. Yes, it may be arranged so that the phase is shifted by 1/2 with respect to the adjacent protrusion rows as shown in the example, but in order to make it closer to the lattice arrangement, for example, the phase is shifted by 1/4. May be. By adjusting the phase shift between 0 and 1/4, it is possible to balance the clamping force of the elastic member 2 and the avoidance of cutting.

  In order to obtain a soft texture, the area ratio of the joint 3 in the fixed region of the elastic member 2 is preferably 40% or less, particularly preferably 30% or less, and 5% or less. Is most preferred. Further, in the non-fixed region of the elastic member 2, in order to maintain the bonding strength of the sheets 1A and 1B, the area ratio of the joint portion 3 needs to be at least 2%. In the fixed region of the elastic member 2, the sheet bends due to the contraction of the elastic member 2, so that a bonding strength equal to or higher than the non-fixed region of the elastic member 2 is required. Therefore, in the fixed region of the elastic member 2, the area ratio of the joint portion 3 is preferably 5% or more, and more preferably 4% or more.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, 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 absorption part 20, 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 sheet 20 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, for other portions, for example, the intermediate portion in the width direction, considering the flexibility, it is preferable to reduce the rigidity to 5 to 35 cN / 50 mm, preferably 10 to 25 cN / 50 mm. In addition, the range which makes rigidity high is the range of 5-30 mm to the center side from the width direction both-sides edge of the interior body 200 in the width direction, and the interior body 200, the abdominal side exterior sheet | seat 12F, and the back side exterior sheet | seat 12B in the front-back 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-Flexural rigidity 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 body 200 was measured in the longitudinal direction. Measure the bending stiffness. The test piece is prepared by removing the 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 spunlace method, a spunbond 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. .
Further, the top sheet 30 may be composed of one sheet or may be composed of 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, 25~60g / m} 2 is more preferable. 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, the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film. Non-woven fabrics that ensure liquid impermeability (in this case, a liquid-impermeable sheet is composed of a waterproof film and a non-woven fabric). 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 each of the left and right sides.

  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. In the meantime, a plurality of elongated elastic members 63 are fixed in a stretched state along the longitudinal direction at intervals in the width direction. The elongated elastic member 63 is not fixed to the barrier sheet 62 at the front and rear end portions, and is fixed so that the barrier cuff extends and contracts forward and backward at the intermediate portion. The barrier sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with 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 member 63, thread rubber or the like can be used. When spandex thread rubber is used, the thickness is preferably 420 to 1120 dtex, and more preferably 620 to 940 dtex. The elongation rate 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.

  It is preferable to arrange one or two elongated elastic members 63 at the distal end portion of the inner barrier cuff 61, and it is even more preferable to arrange one or two elongated elastic members 63 at an intermediate portion between the distal end portion and the proximal end portion. When there is the elongated elastic member 63 in the middle part, it becomes easy to hit the skin against the surface in the range from the middle part to the tip part using this as a fulcrum. The arrangement position of the elongated elastic member 63 in the middle portion 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 member 63 is preferably 5 to 25 mm from the distal end to the proximal end, and 12 to 18 mm. More preferred. When the elongated 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. However, the point differs from the front end side portion fixed to the base side portion, the arrangement and number of the elongated 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 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 member 63, it will become easy to hit | skin with respect to skin. The elongated elastic member 63 may be disposed not only at the distal end side but also at the base side. The elongated 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 is preferable.

  In addition, the longitudinal length 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 the elongated elastic cuffs 60, 61 are elongated elastic. The fixed length of the 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. This 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. When located on the back surface side, a position of 0 to 20 mm from the side edge of the interior body 200 is appropriate, but 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 surface 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 the one barrier cuff.

  In the outer and inner barrier cuffs 60 and 61 thus configured, the contraction force of the elongated elastic member 63 acts so as to bring the both ends in the front-rear direction close to each other, but the both ends in the front-rear direction among the protruding parts 66 and 69 do not stand up. In contrast, the free part between them is an unfixed free part, so that only the free part stands up against the body side as shown in FIG. 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.

The dimensions of the barrier cuffs 60 and 61 can be determined as appropriate. However, in the case of an infant paper diaper, for example, as shown in FIG. 10, 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 10 to 50 mm, preferably 15 to 35 mm. Standing height of the outer barrier cuff 60 (width direction length of the protruding portion 69 in the unfolded state) W6 is 15 to 60 mm, particularly 20 to 40 mm. Is preferred. Further, the separation distance W4 between the tips in a state where the inner barrier cuff 61 is tilted to the surface of the top sheet 30 is preferably 60 to 170 mm, particularly 70 to 120 mm. Further, it is preferable that the separation distance W3 between the innermost folds when the outer barrier cuff 60 is flatly folded so as to be parallel to the surface of the top sheet 30 is 60 to 190 mm, particularly 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 set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 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, 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 have a rectangular shape, but as shown in FIGS. 1 and 6, the absorber 56 is located at the front end 56F, the rear end 56B, and between them, and is narrower than the front end 56F and the rear end 56B. The hourglass shape having the constricted portion 56N is preferable 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 in the overlapping portion between the absorber 56 and the ventral exterior sheet 12F is L2, and 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)
0 mm ≦ L1-L2 ≦ 70 mm (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 in the width direction from a posture in which the barrier cuffs 60 and 61 are erected on the inner side 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 front-rear direction 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. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. 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 said unconditionally, it can be set to 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. When it 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)
When the covering sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used instead 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 FIGS. 3 and 4, the covering sheet 58 may cover only the back surface and the side surface 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 two upper and lower sheets or disposed only on the lower surface, but this is not desirable 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, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a point bond nonwoven fabric, an air-through nonwoven fabric, an air point nonwoven fabric, a spunlace nonwoven fabric, an SMS nonwoven fabric, or the like, which is composed 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.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of 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 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 a product state. It is a rear view of a product state. It is a front view of the product state of another pants-type disposable diaper. It is a front view of the product state of another pants-type disposable diaper. It is a front view of the product state of another pants-type disposable diaper. It is a schematic diagram for demonstrating an expansion-contraction part formation apparatus. It is the width direction sectional view of 1st Embodiment which shows the state where the continuous sheet was pinched | interposed into the horn and the anvil roll, and its cross-sectional view. It is the cross-sectional view of the width direction of 1st Embodiment of the continuous sheet of the state which applied the tensile force to the elastic member, and its cross-sectional view. It is the cross-sectional view of the width direction of 1st Embodiment of the continuous sheet of the state which does not apply tensile force to an elastic member, and its cross-sectional view. It is the width direction sectional drawing of 2nd Embodiment which shows the state by which the continuous sheet was pinched | interposed into the horn and the anvil roll, and its cross section. It is a perspective view which shows the cutting process of an elastic member.

  DESCRIPTION OF SYMBOLS 1 ... Sheet | seat, 2 ... Elastic member, 3 ... Joint part, 4 ... Continuous sheet, 5 ... Ultrasonic vibration source, 6 ... Horn, 7 ... Anvil roll, 7A, 7C protrusion.

Claims (5)

An exterior sheet having at least a waistline portion and having a portion in which the inner layer and the outer layer are bonded to the waistline portion;
On the body side of this exterior sheet, an interior body that is provided along the center in the width direction and absorbs and holds an object;
Between the inner layer and the outer layer in the waist portion, a plurality of elongated elastic members are provided in parallel in a state of extending along the waist direction,
Wherein the inner and outer layers are each said joint being joined without going through each of said elongated elastic members at both sides in the width direction of the elongated elastic member is formed,
Each of the elongated elastic members is a pants-type disposable diaper that is sandwiched and fixed between a joint portion on one side in the width direction and a joint portion on the other side in the width direction,
Each said elongated elastic member has one end portion is immovable fixed to the outer sheet, the whole of the other end portion excluding the one end portion is movable relative to the outer sheet, the A portion located between the joint portions in the other end side portion is sandwiched and fixed in a state of being movable in the direction of the one end portion between the joint portions, and the entire other end side portion including the sandwich fixing portion is the stretching of the waist direction of the clamping fixing part and corresponding flex region of the section, a portion thereof by a distance corresponding to the decompression degree drawn into the one end side Rutotomoni, located between the junction of the other end portion Is configured to be sandwiched and fixed between the joints ,
When unfolded the waist portion during mounting, stretchable region extends at waistline portion, the whole of the other end portion of the elongated elastic member by a distance corresponding to the stretching degree is drawn at one end Rutotomoni, this The portion located between the joints in the other end side portion is sandwiched and fixed between the joints , so that the natural length of the waistline is expanded to fit the wearer's body shape, and the elongated shape at the time of wearing Configured to reduce the amount of extension of the elastic member,
A pants-type disposable diaper characterized by that.   The stretchability rate when the stretchable region is stretched from the unstretched state to the maximum stretched length and then returned to the non-stretchable state is 0.6 to 0.95 times the stretchable rate of the stretchable region in the unstretched state. The underpants type disposable diaper of Claim 1 comprised as follows. The waistline portion is a non-stretchable region in which the center portion in the width direction does not have the clamping and fixing portion, and both side portions located on both sides in the width direction of the non-stretchable region are the stretchable regions,
The elongated elastic member in each stretchable region extends from the widthwise outer end of each stretchable region to the widthwise center end, and the widthwise outer end of each stretchable region is the exterior sheet. Fixed against immovable,
The pants-type disposable diaper according to claim 1 or 2. The waistline portion is a non-stretchable region in which the center portion in the width direction does not have the clamping and fixing portion, and both side portions located on both sides in the width direction of the non-stretchable region are the stretchable regions,
The elongated elastic member in each stretchable region extends from the outer end in the width direction in each stretchable region through the end on the center side in the widthwise direction into the non-stretchable region, and in the width direction in each stretchable region. The outer end is fixed so as not to move with respect to the exterior sheet,
The pants-type disposable diaper according to claim 1 or 2. In the stretchable part structure in the disposable absorbent article, which is provided between the inner layer and the outer layer in a state where the elongated elastic member is stretched along its longitudinal direction,
Wherein the inner layer and the outer layer, the provided joints are joined without interposition of said elongated elastic members at both sides in the width direction of the elongated elastic member is formed,
The elongated elastic member is sandwiched and fixed between a joint portion on one side in the width direction and a joint portion on the other side in the width direction,
It said elongated elastic member has one end portion is immovable fixed to the outer sheet, the whole of the other end portion excluding the one end portion is movable relative to the outer sheet, the other A portion located between the joint portions in the end side portion is sandwiched and fixed in a state of being movable in the direction of the one end portion between the joint portions, and at the time of mounting, the whole of the other end side portion including the sandwich fixing portion is Due to the extension of the elongated elastic member in the longitudinal direction of the expansion / contraction region corresponding to the clamping and fixing portion, the entire other end side portion of the elongated elastic member is drawn to the one end side by a distance corresponding to the degree of extension. Rutotomoni, the portion located between the joint portions in the other end portion is sandwiched and fixed between the joint portion, thereby to fit the body type of the wearer, you the clamping fixing part of the elongated elastic member The natural length of the longitudinal direction of the elongated elastic member while expanding, the expansion amount of said elongated elastic member at the time of mounting is configured to reduce that,
A stretchable part structure in a disposable absorbent article.

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