JP2016054989A5 - - Google Patents

Description

Pants-type disposable diaper manufacturing method

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

  As one form of the pants-type disposable diaper, a cylindrical exterior body formed by joining both sides of the abdominal exterior body and both sides of the back exterior body, and the front portion is the width of the abdominal exterior body An inner body provided in a central region in the direction and a rear portion of the back side outer body body in a central region in the width direction of the back side outer body so as to pass through the wearer's crotch. A body that is separated from the body without being continuous is known (see, for example, Patent Document 1). In such a two-split exterior type, the ventral exterior body and the back exterior body are spaced apart from each other on the crotch side, so that it is not necessary or necessary to punch out the leg openings for passing the legs. Has the advantage of requiring a small area. That is, since the separation piece (hereinafter also referred to as trim) is discarded, the material loss (hereinafter also referred to as trim loss) can be suppressed.

  As a method for manufacturing such a two-split exterior type, a method of assembling the abdominal exterior body and the back exterior body separately with sheet materials that are continuous in separate belt shapes is common. The form shown in FIG. 1 and the form shown in FIG. 1 of Patent Document 2 are classified into this method. In these forms, since the number of sheet materials to be used is plural, there is a problem that the material cost increases.

  On the other hand, as in the form described in paragraph 0037 of Patent Document 1, a sheet material continuous in a strip shape is MD direction (machine direction, transfer direction. The transverse direction perpendicular to this is the CD direction). The elastic elastic member is disposed on the sheet material, and the sheet material is folded to cover the elastic elastic member, and then the sheet material is continuously cut in a direction parallel to the MD direction to The method of dividing into backside elastic bands is preferable in that an exterior body can be manufactured from a single sheet material.

  However, in the conventional method of manufacturing the exterior two-split type exterior body from a single sheet material, either the waist edge or the leg opening edge of the ventral exterior body and the back exterior body is a crease ( The sheet material does not squeeze and is not soft to the touch), and the front and rear end portions of the interior body cannot be covered with the sheet material forming the abdominal exterior body and the back exterior body. was there.

  For example, in the form described in paragraph 0037 of Patent Document 1, the waist edge of one of the abdominal exterior body and the back exterior body does not become a fold of the sheet material, and the abdominal exterior body and the back exterior In both the bodies, the edges of the leg openings do not become folds of the sheet material, and the front and rear ends of the interior body cannot be covered with the sheet material forming the abdominal exterior body and the back exterior body.

  Furthermore, in the form described in paragraph 0037 of Patent Document 1, in the step of folding the sheet material, the wide sheet material is folded in two, and the edge of the sheet material is easily displaced at the time of folding. Since it remains at the edge and the edge of the leg opening, the problem that the touch and the appearance are deteriorated is promoted, the problem that it is difficult to fold it cleanly without wrinkles, and the equipment for wrapping (sailor) becomes large There are also problems.

  On the other hand, in the structure shown in FIGS. 1 to 13 of Patent Document 3, the edges of the waist and leg openings of the ventral exterior body and the back exterior body all become folds of the sheet material, and the ventral exterior body and back Although it is very preferable because it covers the front and rear end portions of the interior body with the sheet material forming the side exterior body, it has been proposed to form such a structure from a single sheet material. Not.

JP 2009-061045 A JP 2010-158590 A JP 2009-160129 A

  Therefore, the main problem of the present invention is to manufacture the ventral-side exterior body and the back-side exterior body from a single sheet material, while the abdominal-side exterior body and the back-side exterior body have a waist edge and a leg opening edge. It is to provide a method for producing a pants-type disposable diaper, in which all the creases in the sheet material can cover the front and rear ends of the interior body with the sheet material forming the abdominal exterior body and the back exterior body.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior body formed by joining both sides of the ventral exterior body and both sides of the back exterior body;
The interior body provided such that the front portion is joined to the center region in the width direction of the abdominal exterior body and the rear portion is joined to the center region in the width direction of the back exterior body, and passes through the crotch of the wearer. And comprising
In the method for producing a pants-type disposable diaper, wherein the ventral exterior body and the back exterior body are separated without being continuous on the crotch side,
A continuous sheet material is supplied along the continuous direction,
The second regions on both sides in the CD direction except for the first region in the CD direction in the sheet material are folded and joined to the center side in the CD direction with the center in the CD direction of the second region as the folding position, respectively. A stretchable band that is continuous in a band shape is formed by arranging a second region elastic stretchable member for imparting stretchability to the belly side exterior body and the backside exterior body between the sheet materials of the folded portion. ,
The stretch band is cut at the intermediate position in the CD direction of the first region, thereby forming a pair of ventral stretch band and dorsal stretch band ,
The CD direction positions of these ventral stretch bands and dorsal stretch bands are interchanged, or these ventral stretch bands and dorsal stretch bands are turned upside down, so that the second region is in the CD direction center side and the above The first area is rearranged outside the CD direction,
The pair of the ventral side stretchable band and the back side stretchable band which have been changed in arrangement are transported in parallel in the CD direction with a gap therebetween, and the separately manufactured interior body is supplied with a gap in the MD direction. the assembly of or on the line, the second region back surface of the ventral stretchable bands before-side portion of the inner body, and the back surface is the back side stretchable bands of rear portion of the inner body Are joined to each of the second regions to form an interior assembly.
The first region in the interior assembly is folded and joined to the center in the CD direction to a position covering the front-rear direction end of the interior body,
After the interior assembly with the first region folded back is folded in two in the CD direction, the ventral stretch band and the back stretch band are joined to the both side portions of each diaper, and the ventral side The elastic band and the back elastic band are cut at the boundary of each diaper, and the individual diaper in which the ventral outer body and the back outer body are respectively formed by the ventral elastic band and the back elastic band is manufactured. The
A method for producing a pants-type disposable diaper, characterized in that

(Function and effect)
The present invention is the same as that described in Patent Document 1 in that a stretchable band formed by folding a single sheet material is divided to form an abdominal stretchable band and a dorsal stretchable band. After the folding, the first region is folded after the CD direction position is exchanged or turned upside down, so that the abdominal side exterior body and the back side exterior body are manufactured with a single sheet material. The edges of the waist and leg openings of the side exterior body and the back exterior body all become folds of the sheet material, and the front and rear ends of the interior body are covered with the sheet material forming the abdominal exterior body and the back exterior body. As a result, it becomes possible to manufacture products that are excellent in touch and appearance.

<Invention of Claim 2>
The folding position of the first region is spaced outward in the CD direction from the folded portion of the second region, and between the sheet material of the folded portion of the first region in the separated portion, The manufacturing method of the underpants type disposable diaper of Claim 1 by which the 1st area | region elastic elastic member for providing a stretching property to a back side exterior body is arrange | positioned.

(Function and effect)
When the first elastic elastic member is provided in the first area in this way, when the first area elastic elastic member is arranged close to the edge of the waist, the folded portion of the second area does not overlap with the arrangement area. It is suitable for increasing the air permeability of the.

<Invention of Claim 3>
The folding position of the first region is aligned with the tip of the folded portion of the second region, and the belly-side exterior body and the back-side exterior body are made stretchable between the sheet materials of the folded portion of the first region. The manufacturing method of the underpants type disposable diaper of Claim 1 by which the 1st area | region elastic elastic member for providing is not arranged.

(Function and effect)
As described above, when the folding position of the first region is matched with the tip of the folded portion of the second region (the outer edge in the CD direction), the second region elastic elastic member can be arranged close to the edge of the waist. The first region elastic elastic member may not be provided (not shown). In this case, the manufacturing process is simplified, and the folded portion of the second region and the folded portion of the first region are overlapped over substantially the entire area, which is suitable for increasing the rigidity of the exterior body.

<Invention of Claim 4>
An exterior body formed by joining both sides of the ventral exterior body and both sides of the back exterior body;
The interior body provided such that the front portion is joined to the center region in the width direction of the abdominal exterior body and the rear portion is joined to the center region in the width direction of the back exterior body, and passes through the crotch of the wearer. And comprising
In the method for producing a pants-type disposable diaper, wherein the ventral exterior body and the back exterior body are separated without being continuous on the crotch side,
A continuous sheet material is supplied along the continuous direction,
The second regions on both sides in the CD direction, except for the first region in the middle of the CD direction in the sheet material, are folded in two on the center side in the CD direction and joined between the sheet materials in the folded portion, By arranging a second region elastic elastic member for imparting stretchability to the abdominal exterior body and the back exterior body, a stretchable band that is continuous in a band shape is formed,
The stretch band is cut at the intermediate position in the CD direction of the first region, thereby forming a pair of ventral stretch band and dorsal stretch band ,
While the pair of ventral stretch bands and dorsal stretch bands are transported in parallel in the CD direction, the separately manufactured interior body is supplied with a spacing in the MD direction or on the line. the assembly in the in the CD direction central side portion of the first region of the surface of the front end portion is the ventral stretchable bands of the inner body, and wherein the surface of the end portion dorsal stretchable bands after said inner body The inner assembly is formed by being joined to each of the first region of the first region in the CD direction center side,
The first region and the second region on both sides in the CD direction of the interior assembly are folded back by being folded to the center side in the CD direction and the back surface side of the interior body, with the center in the CD direction of the first region being the folding position. Of the portion, the portion overlapping the first region is joined to the first region and the portion overlapping the interior body is joined to the interior body,
After the interior assembly in which the first region and the second region are folded is folded in the CD direction, the abdominal stretch band and the back stretch band are joined to each side portion of the diaper. The ventral stretch band and the back stretch band are cut at the boundaries of each diaper, and the ventral stretch body and the back stretch band form the ventral exterior body and the back exterior body, respectively. Diapers are manufactured,
A method for producing a pants-type disposable diaper, characterized in that

(Function and effect)
The present invention is the same as that described in Patent Document 1 in that a stretchable band formed by folding a single sheet material is divided to form an abdominal stretchable band and a dorsal stretchable band. After fixing the front and rear end portions of the first region to the center side in the CD direction, the first region and the second region are folded back, so that the abdominal exterior body and the back exterior body are made of one sheet material. While being manufactured, the waist edge and leg opening edge of the abdominal exterior body and the back exterior body all become folds of the sheet material, and the interior body is a sheet material that forms the abdominal exterior body and the back exterior body The front and rear ends of the cover are covered, and a product with excellent touch and appearance can be manufactured. Further, in comparison with the first aspect of the invention, there is an advantage that replacement of the CD direction position or upside down is unnecessary.

<Invention of Claim 5>
The folding position of the first region is spaced closer to the center in the CD direction than the folded portion of the second region, and between the sheet materials of the folded portion of the first region in the separated portion, the ventral-side exterior body The manufacturing method of the underpants type disposable diaper of Claim 4 by which the 1st area | region elastic elastic member for providing a stretching property to the backside exterior body is arranged.

(Function and effect)
When the first elastic elastic member is provided in the first area in this way, when the first area elastic elastic member is arranged close to the edge of the waist, the folded portion of the second area does not overlap with the arrangement area. It is suitable for increasing the air permeability of the.

<Invention of Claim 6>
The folding position of the first region is aligned with the tip of the folded portion of the second region, and the belly-side exterior body and the back-side exterior body are made stretchable between the sheet materials of the folded portion of the first region. The manufacturing method of the underpants type disposable diaper of Claim 4 with which the 1st area | region elastic elastic member for providing is not arranged.

(Function and effect)
As described above, when the folding position of the first region is matched with the tip of the folded portion of the second region (the outer edge in the CD direction), the second region elastic elastic member can be arranged close to the edge of the waist. The first region elastic elastic member may not be provided (not shown). In this case, the manufacturing process is simplified, and the folded portion of the second region and the folded portion of the first region are overlapped over substantially the entire area, which is suitable for increasing the rigidity of the exterior body.

  As described above, according to the present invention, it is possible to produce space-saving and simple equipment, while providing the advantage that the risk of wrinkles can be reduced.

It is a top view which shows a manufacturing flow schematically. It is a top view which shows a manufacturing flow schematically. It is a top view which shows a manufacturing flow schematically. It is a top view which shows a manufacturing flow schematically. 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 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is sectional drawing which shows only the principal part of an underpants type disposable diaper with a dimension.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
<Examples of manufacturing methods for pants-type disposable diapers>
(First form)
FIG.1 and FIG.2 has shown an example of the manufacturing method of a pants type disposable diaper. This production line has a transverse flow configuration in which the diaper width direction is the MD direction (machine direction, line flow direction), and here, the abdominal stretchable band 12f and the dorsal exterior body 12B become the abdominal exterior body 12F. The back side elastic band 12b is formed, and the interior body 200 manufactured by another line is attached to the abdominal side elastic band 12f and the back side elastic band 12b. In addition, in order to make an explanation easy to understand, members that are continuous in the manufacturing process are also denoted by the same reference numerals as those after manufacture.

  More specifically, this production line includes a second region folding / elastic member attaching step 301, an elastic band dividing / arranging step 302, an elastic member cutting step 303, an interior body attaching step 304, a first region folding / elasticity. It has a member attaching step 305, a folding step 306, a side joining step 307, and a separating step 308.

  That is, in the second region folding / elastic member attaching step 301, the sheet material 12S continuous in a strip shape with a predetermined width is transferred along the continuous direction, while leaving the first region S1 in the middle of the CD direction of the sheet material 12S. The second regions S2 on both sides in the CD direction are folded and joined to the center in the CD direction with the center in the CD direction of the second region S2 being the folded position, and the product between the folded sheet materials 12S. In a state where a number of second region elastic elastic members 15, 18, 19 for imparting elasticity to the ventral side exterior body 12F and the back side exterior body 12B are extended in the MD direction at intervals in the CD direction. By being supplied and sandwiched, an elastic band that is continuous in a band shape is formed.

  The second region elastic elastic members 15, 18, 19 are fixed by applying a hot melt adhesive to the outer surface of the second region elastic elastic members 15, 18, 19, and fixing the sheet material 12 </ b> S with this adhesive. Alternatively, a hot melt adhesive may be applied to the sheet material 12S, and the elastic elastic members 15, 18, and 19 may be sandwiched therebetween. In addition to fixing the entire lengthwise direction of the elastic stretch members 15, 18, and 19 to the sheet material 12S, it is also possible to fix only the positions at both ends in the width direction in each diaper.

  The folding width (CD direction length) of the second region S2 can be changed as appropriate, for example, by matching the longitudinal length of the waist lower part U and the waist part T (described later) of the product.

  Joining between the sheet materials 12S in the folded portion of the second region S2 can be performed by a hot melt adhesive or by welding means such as heat sealing or ultrasonic welding, and the joining pattern is not particularly limited, and the MD direction In order to improve air permeability and flexibility, a pattern that is intermittently joined to at least one of the MD direction and the CD direction is preferable. For example, when joining with a hot-melt adhesive, various coating methods such as a slot coat that can be applied to a surface with no gap, a spiral coat or a curtain coat that can be applied to a surface with a gap, and an arbitrary application pattern It is also possible to join the sheet materials 12S to each other via a hot melt adhesive applied to the outer surface of the elastic elastic members 15, 18, and 19 described above. The second region elastic elastic members 15, 18, 19 are fixed and the sheet material 12 </ b> S of the folded portion of the second region S <b> 2 is joined at the same position and at the same fixing means, and at the same position or at different means at another position. It can also be done.

  Next, in the elastic band division / arrangement changing step 302, the elastic band is cut by a slitter at the slit position SL in the middle of the CD direction of the first region S1, thereby forming the back elastic band 12b and the ventral elastic band 12f. Divided. The slit position SL may be centered in the CD direction of the stretchable band or a position biased to either one, but the slit position SL is biased to the ventral side, and the back side stretchable band 12b is wider than the ventral side stretchable band 12f. Is preferable. Thereafter, the CD direction positions of the back-side stretchable band 12b and the ventral-side stretchable band 12f are switched, so that the second region S2 is rearranged in the CD direction center side and the first region S1 is placed outside the CD direction. Although not shown, the back side elastic band 12b and the abdominal side elastic band 12f may be turned upside down, and the second area S2 may be rearranged in the CD direction center side and the first area S1 may be changed to the CD direction outer side.

  Prior to the interior body attaching step 305 to be described later, the elastic member cutting step 303 is performed on the back side elastic band 12b and the abdominal side elastic band 12f formed in this way as necessary, and predetermined in the MD direction. And a part CT (for example, a portion overlapping an interior body 200 described later) of the elastic elastic members 15, 18, 19 of the back side elastic band 12b and the elastic elastic members 15, 18, 19 of the abdominal elastic band 12f. Are partially divided by a method such as cutting or heat embossing, so that the elastic force of the elastic elastic members 15, 18 and 19 does not act on the portion CT. This segmentation can also be performed before the stretchable band split arrangement changing step 302. The elastic member cutting step 303 can be omitted.

  Further, for the back-side stretchable band 12b and the abdominal-side stretchable band 12f formed in this way, the back-side stretchable band 12b and the abdominal-side stretchable band as necessary prior to the interior body attaching step 305 described later. It is also possible to perform a leg opening cutting and dividing step in which at least one of 12f (the back side elastic band 12b in the illustrated form) is cut off in the CD direction center side edge (portion serving as the edge of the leg opening LO) in a curved line (not shown). ).

  Next, in the interior body attaching step 305, the interior body 200 manufactured in advance on a separate line with respect to the abdominal stretchable band 12f and the back stretchable band 12b transferred in parallel with a gap in the CD direction is MD. Are supplied at predetermined intervals in the direction, the back surface of the front part of the interior body 200 is in the second region S2 of the ventral stretch band 12f, and the back surface of the back part of the interior body 200 is the back stretch band 12b. The interior assembly is formed by being joined to each of the second regions S2. These joinings can be performed by appropriate means such as hot melt adhesive or heat sealing. Moreover, the interior body 200 may supply what was formed in the complete body by another line, or separately supply what was formed as several parts by another line, and it assembles | assembles on the elastic bands 12f and 12b. You may do it.

  Next, in the first region folding / elastic member attaching step 305, the first regions S1 on both sides in the CD direction of the interior assembly are folded back toward the center in the CD direction to the positions covering the longitudinal ends of the interior body 200, respectively. Be joined. At this time, a large number of first region elastic elastic members 16 are provided between the sheet material 12S of the folded portion of the first region S1 to impart elasticity to the abdominal exterior body 12F and the back exterior body 12B of the product. , 17 are supplied and sandwiched with an interval in the CD direction and extended in the MD direction. The fixing of the first region elastic elastic members 16 and 17 and the joining between the sheet materials 12S of the folded portion of the first region S1 can be performed in the same manner as the second region elastic elastic members 15, 18, and 19 in the second region S2. it can.

  The folding position of the first region S1 is a portion that becomes the edge of the waist in the product. As shown in FIG. 1, when the folding position is separated from the folded portion (double portion) of the second region S2 to the outside in the CD direction, and the first region elastic elastic members 16 and 17 are provided in the separated portion, When the first region elastic elastic members 16 and 17 are arranged near the edge of the waist, the folded portion of the second region S2 does not overlap the arrangement region, which is suitable for increasing the air permeability of the exterior body. On the other hand, when the folding position of the first region S1 is set to the tip of the folded portion of the second region S2 (the outer edge in the CD direction), the second region elastic elastic members 15, 18, and 19 are brought close to the edge of the waist. Since it can arrange | position, it is not necessary to provide the 1st area | region elastic elastic members 16 and 17 (illustration omitted). In this case, the manufacturing process is simplified, and the folded portion of the second region S2 and the folded portion of the first region S1 are overlapped over substantially the entire area, which is suitable for increasing the rigidity of the exterior body.

  Thereafter, in the folding step 306, the interior assembly is folded at the center in the CD direction so that the attachment surface of the interior body 200 in the ventral stretch band 12f and the attachment surface of the interior body 200 in the back stretch band 12b overlap. After that, in the side part joining step 307, the ventral side elastic band 12f and the back side elastic band 12b are joined to form both side parts of each diaper, and the side seal part 12A is formed. The elastic band 12f and the back elastic band 12b are cut at the boundaries of the individual diapers to obtain individual diapers DP. The side bonding step 307 and the separation step 308 can be performed simultaneously. In addition, when the width | variety (CD direction length) of the abdominal side elastic band 12f and the back side elastic band 12b does not correspond, you may form the side seal part 12A only in the part with which both the elastic bands 12f and 12b overlap. However, it may be formed over the whole including the surplus portion formed in the wider one.

  According to the first embodiment, after the second region S2 is folded, the first region S1 is folded after the CD-direction position is changed or turned upside down. While manufacturing the body 12F and the backside exterior body 12B, the waist edges and leg opening edges of the abdominal side exterior body 12F and the backside exterior body 12B all become folds of the sheet material 12S, and the abdominal side exterior body 12F And the front-and-rear end part of the interior body 200 comes to be covered with the sheet material 12S that forms the back side exterior body 12B (see the product structure example described later).

(Second form)
FIG.3 and FIG.4 has shown the other example of the manufacturing method of an underpants type disposable diaper. This production line has a transverse flow configuration in which the diaper width direction is the MD direction (machine direction, line flow direction), and here, the abdominal stretchable band 12f and the dorsal exterior body 12B become the abdominal exterior body 12F. The back side elastic band 12b is formed, and the interior body 200 manufactured by another line is attached to the abdominal side elastic band 12f and the back side elastic band 12b. In addition, in order to make an explanation easy to understand, members that are continuous in the manufacturing process are also denoted by the same reference numerals as those after manufacture.

  More specifically, this production line includes a second region folding / elastic member attaching step 301, an elastic band dividing step 309, an elastic member cutting step 303, an interior body attaching step 304, and a first region folding / elastic member attaching step. 305, a folding step 306, a side joining step 307, and a separation step 308.

  That is, in the second region folding / elastic member attaching step 301, the sheet material 12S continuous in a strip shape with a predetermined width is transferred along the continuous direction, while leaving the first region S1 in the middle of the CD direction of the sheet material 12S. The second regions S2 on both sides in the CD direction are folded and joined to the center in the CD direction with the center in the CD direction of the second region S2 being the folded position, and the product between the folded sheet materials 12S. In a state where a number of second region elastic elastic members 15, 18, 19 for imparting elasticity to the ventral side exterior body 12F and the back side exterior body 12B are extended in the MD direction at intervals in the CD direction. By being supplied and sandwiched, an elastic band that is continuous in a band shape is formed.

  The second region elastic elastic members 15, 18, 19 are fixed by applying a hot melt adhesive to the outer surface of the second region elastic elastic members 15, 18, 19, and fixing the sheet material 12 </ b> S with this adhesive. Alternatively, a hot melt adhesive may be applied to the sheet material 12S, and the elastic elastic members 15, 18, and 19 may be sandwiched therebetween. In addition to fixing the entire lengthwise direction of the elastic stretch members 15, 18, and 19 to the sheet material 12S, it is also possible to fix only the positions at both ends in the width direction in each diaper.

  The folding width (CD direction length) of the second region S2 can be changed as appropriate, for example, by matching the longitudinal length of the waist lower part U and the waist part T (described later) of the product.

  Joining between the sheet materials 12S in the folded portion of the second region S2 can be performed by a hot melt adhesive or by welding means such as heat sealing or ultrasonic welding, and the joining pattern is not particularly limited, and the MD direction In order to improve air permeability and flexibility, a pattern that is intermittently joined to at least one of the MD direction and the CD direction is preferable. For example, when joining with a hot-melt adhesive, various coating methods such as a slot coat that can be applied to a surface with no gap, a spiral coat or a curtain coat that can be applied to a surface with a gap, and an arbitrary application pattern It is also possible to join the sheet materials 12S to each other via a hot melt adhesive applied to the outer surface of the elastic elastic members 15, 18, and 19 described above. The second region elastic elastic members 15, 18, 19 are fixed and the sheet material 12 </ b> S of the folded portion of the second region S <b> 2 is joined at the same position and at the same fixing means, and at the same position or at different means at another position. It can also be done.

  Next, in the elastic band division / arrangement changing step 302, the elastic band is cut by a slitter at the slit position SL in the middle of the CD direction of the first region S1, thereby forming the back elastic band 12b and the ventral elastic band 12f. Divided. The slit position SL may be centered in the CD direction of the stretchable band or a position biased to either one, but the slit position SL is biased to the ventral side, and the back side stretchable band 12b is wider than the ventral side stretchable band 12f. Is preferable. Thereafter, the CD direction positions of the back-side stretchable band 12b and the ventral-side stretchable band 12f are switched, so that the second region S2 is rearranged in the CD direction center side and the first region S1 is placed outside the CD direction. Although not shown, the back side elastic band 12b and the abdominal side elastic band 12f may be turned upside down, and the second area S2 may be rearranged in the CD direction center side and the first area S1 may be changed to the CD direction outer side.

  Prior to the interior body attaching step 305 to be described later, the elastic member cutting step 303 is performed on the back side elastic band 12b and the abdominal side elastic band 12f formed in this way as necessary, and predetermined in the MD direction. And a part CT (for example, a portion overlapping an interior body 200 described later) of the elastic elastic members 15, 18, 19 of the back side elastic band 12b and the elastic elastic members 15, 18, 19 of the abdominal elastic band 12f. Are partially divided by a method such as cutting or heat embossing, so that the elastic force of the elastic elastic members 15, 18 and 19 does not act on the portion CT. This segmentation can also be performed before the stretchable band split arrangement changing step 302. The elastic member cutting step 303 can be omitted.

  Further, for the back-side stretchable band 12b and the abdominal-side stretchable band 12f formed in this way, the back-side stretchable band 12b and the abdominal-side stretchable band as necessary prior to the interior body attaching step 305 described later. It is also possible to perform a leg opening cutting and dividing step in which at least one of 12f (the back side elastic band 12b in the illustrated form) is cut off in the CD direction center side edge (portion serving as the edge of the leg opening LO) in a curved line (not shown). ).

  Next, in the interior body attaching step 305, the interior body 200 manufactured in advance on a separate line with respect to the abdominal stretchable band 12f and the back stretchable band 12b transferred in parallel with a gap in the CD direction is MD. Are supplied at predetermined intervals in the direction, and the surface of the front end portion of the interior body 200 is at the center portion in the CD direction of the first region S1 of the ventral stretch band 12f, and the surface of the rear end portion of the interior body 200 is An interior assembly is formed by joining to the CD direction center side part of 1st area | region S1 of the back side elastic band 12b, respectively. The joint portions with the front and rear end portions of the interior body 200 in the first region S <b> 1 are portions that cover the front and rear end portions of the surface of the interior body 200. These joinings can be performed by appropriate means such as hot melt adhesive or heat sealing. Moreover, the interior body 200 may supply what was formed in the complete body by another line, or separately supply what was formed as several parts by another line, and it assembles | assembles on the elastic bands 12f and 12b. You may do it.

  Next, in the first region folding / elastic member attaching step 305, the first region S1 and the second region S2 on both sides in the CD direction in the interior assembly are respectively located in the center in the CD direction with the middle in the CD direction of the first region S1 as the folding position. In addition, the folded back portion of the interior body 200 is joined to the first region S1 of the folded portion and the portion overlapping the interior body 200 is joined to the first region S1. At this time, a large number of first region elastic elastic members 16 are provided between the sheet material 12S of the folded portion of the first region S1 to impart elasticity to the abdominal exterior body 12F and the back exterior body 12B of the product. , 17 are supplied and sandwiched with an interval in the CD direction and extended in the MD direction. The fixing of the first region elastic elastic members 16 and 17 and the joining between the sheet materials 12S of the folded portion of the first region S1 can be performed in the same manner as the second region elastic elastic members 15, 18, and 19 in the second region S2. it can.

  The folding position of the first region S1 is a portion that becomes the edge of the waist in the product. As shown in FIG. 3, when the folding position is separated from the folded portion (double portion) of the second region S2 toward the center in the CD direction, and the first region elastic elastic members 16 and 17 are provided in the separated portion, When the first region elastic elastic members 16 and 17 are arranged near the edge of the waist, the folded portion of the second region S2 does not overlap the arrangement region, which is suitable for increasing the air permeability of the exterior body. On the other hand, when the folding position of the first region S1 is set to the tip of the folded portion of the second region S2 (the outer edge in the CD direction), the second region elastic elastic members 15, 18, and 19 are brought close to the edge of the waist. Since it can arrange | position, it is not necessary to provide the 1st area | region elastic elastic members 16 and 17 (illustration omitted). In this case, the manufacturing process is simplified, and the folded portion of the second region S2 and the folded portion of the first region S1 are overlapped over substantially the entire area, which is suitable for increasing the rigidity of the exterior body.

  Thereafter, as in the first embodiment, in the folding step 306, the interior assembly body is arranged such that the attachment surface of the interior body 200 in the ventral side elastic band 12f and the attachment surface of the interior body 200 in the back side elastic band 12b overlap. Is folded at the center in the CD direction, and in the side joining step 307, the ventral side elastic band 12f and the back side elastic band 12b are joined to form the side seal part 12A in the parts that are both sides of each diaper, In the separation step 308, the ventral elastic band 12f and the back elastic band 12b are cut at the boundaries of the individual diapers to obtain individual diapers DP. The side bonding step 307 and the separation step 308 can be performed simultaneously. In addition, when the width | variety (CD direction length) of the abdominal side elastic band 12f and the back side elastic band 12b does not correspond, you may form the side seal part 12A only in the part with which both the elastic bands 12f and 12b overlap. However, it may be formed over the whole including the surplus portion formed in the wider one.

  According to the second embodiment, after fixing the front and rear end portions of the interior body 200 to the center portion in the CD direction of the first region S1, the first region S1 and the second region S2 are folded back. While the abdominal exterior body 12F and the back exterior body 12B are manufactured from a single sheet material 12S, the edges of the waist and leg openings of the abdominal exterior body 12F and the back exterior body 12B are all sheet materials. 12S becomes a fold, and the front and rear ends of the inner body 200 are covered with the sheet material 12S forming the ventral outer body 12F and the back outer body 12B. Further, as compared with the first embodiment, there is an advantage that replacement of the CD direction position or upside down is unnecessary.

<Example of pants-type disposable diapers>
Next, an example of a pants-type disposable diaper that can be manufactured by the above-described manufacturing method will be described.
5-10 has shown an example of the underpants type disposable diaper. In this pants-type disposable diaper, both sides in the width direction of the abdominal exterior body 12F and both sides in the width direction of the back side exterior body 12B are joined by heat sealing, ultrasonic welding or the like over the entire vertical direction. In addition to forming the bodies 12F and 12B, the front end of the interior body 200 is connected to the inner surface of the center portion in the width direction of the abdominal exterior body 12F in the exterior bodies 12F and 12B by a hot melt adhesive or the like. The rear end portion of the interior body 200 is connected to the inner surface of the central portion in the width direction of 12B by a hot melt adhesive or the like. Reference numeral 12A denotes a joint portion (side seal portion) between the ventral exterior body 12F and the back exterior body 12B. Moreover, the code | symbol Y has shown the full length of the diaper in the expansion | deployment state (vertical direction length from the edge of the waist opening of the front body F to the edge of the waist opening of the back body B), and the code | symbol X is the full width of the diaper in the expansion | deployment state. Is shown.

  The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are portions that support the interior body 200 with respect to the wearer's body. In addition, although the dot pattern part in a figure has shown the hot-melt-adhesive agent which joins each structural member, the welding means which joins by welding of a target member can also be used. Hot melt adhesive is applied in a pattern such as solid, bead, curtain, summit or spiral, and the fixed part of the elastic elastic member is used instead of or together with the outer peripheral surface of the elastic elastic member such as comb gun or sure wrap application. Application to can also be employed.

  The upper openings of the exterior bodies 12F and 12B become waist openings through which the wearer's torso passes, and the portions surrounded by the lower edges of the exterior bodies 12F and 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200 are legs. It becomes a leg opening to let through. In a state where the welded portions 12A of the exterior bodies 12F and 12B are peeled off and developed, the intermediate portions in the front-rear direction are constricted as shown in FIGS. The interior body 200 extends from the back side through the crotch to cover the abdominal side, and is a part that receives the excrement and absorbs and holds the liquid, and the exterior bodies 12F and 12B are interior bodies. It is a part which supports 200 with respect to a wearer.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 7 to 9, the interior body 200 includes a liquid-permeable top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that is responsible for the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) 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 and to prevent reversal. Reference numeral 60 denotes a three-dimensional gather 60 that is provided on both sides of the interior body 200 and stands on the body side in order to prevent excrement from leaking on both sides of the interior body 200.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, 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. .

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

  When the three-dimensional gather 60 is provided, both sides of the top sheet 30 pass between the liquid impermeable sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to prevent liquid penetration. It is preferable to adhere to the impermeable sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.

(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 in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by 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 materials 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.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 is preferably extended to both sides of the side surface of the top sheet 30 of the absorbent element 50 so as to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable sheet 11, especially the absorber 56 side surface.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather 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 addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. A portion other than the attachment portion 65 is a protruding portion 66 (a portion on the folded portion side) protruding from the attachment portion 65. The projecting portion 66 includes a base side portion that extends toward the center in the width direction, and a tip side portion that is folded back outward in the width direction from the tip of the base side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that is not folded outward in the width direction can also be employed. And while it is set as the front-and-rear fixing | fixed part 67 fixed by the hot-melt-adhesive agent or the heat seal with respect to the side part surface of the top sheet 30 in the lying state in the front-back direction among protrusion parts 66, between these, The intermediate portion in the front-rear direction is a non-fixed free part, and an elongated elastic member 63 along the front-rear direction is fixed to the free part in an extended state.

The gather sheet 62 is made of a spunbonded 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 elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Further, as shown in the figure, a waterproof film 64 can be interposed between the gather sheets 62 folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free parts, only the free parts stand on the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 10, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, the distance W3 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers 60 can be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging 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 FIG. 6, the absorber 56 has a front end portion, a rear end portion and a constricted portion having a narrower width than the front end portion and the rear end portion. This is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

  Moreover, although the dimension of the absorber 56 can be determined suitably, it is preferable to extend to the peripheral part of the interior body or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The ratio of particles remaining on the sieve is preferably 30% by weight or less, and the ratio of particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006). Is preferably 60% by weight or more.

  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 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.

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.

(Packaging sheet)
When the packaging 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 in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Crotch cover sheet)
The back side of the liquid-impermeable sheet in the interior body is a part of the exposed portion of the interior body (for example, the entire front-rear direction of the portion exposed between the ventral-side exterior body and the back-side exterior body, but before and after the interior body The crotch portion cover sheet may be attached so as not to extend to the end and to cover the entire side of the interior body). As the crotch portion cover sheet, the same material as that used for an exterior body described later can be used.

(Exterior body)
The exterior bodies 12F and 12B are composed of an abdominal exterior body 12F and a back exterior body 12B, and the abdominal exterior body 12F and the back exterior body 12B are not continuous on the leg side and are separated from each other. The separation distance L8 can be about 150 to 250 mm.

  The exterior bodies 12F and 12B have a trunk periphery T defined as a longitudinal range (a longitudinal range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A. The waistline portion T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where the waist portion WO has a boundary where the stretching stress in the width direction changes (for example, the thickness or elongation rate of the elastic elastic member changes), the waist opening WO side is closer to the waist opening WO side than the waist opening WO side boundary. When there is no such boundary, the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W may be 15 to 40 mm and the waist lower portion U may be 65 to 120 mm.

  Further, the rear exterior body 12 </ b> B shown in the figure has a buttock cover portion 14 that extends to the lower side of the trunk periphery T. Although not shown, the abdominal exterior body 12F may be provided with a heel cover portion that extends below the trunk portion T, or may be configured such that the groin cover portion is provided but the buttock cover portion is not provided. In the illustrated embodiment, the lower edge (leg side edge) of the ventral exterior body and the back exterior body is a straight line, but it may be a curved shape around the leg.

  As shown in FIG. 9, the ventral exterior body 12 </ b> F and the back exterior body 12 </ b> B have a rubber thread or the like for improving the fit with respect to the waist between the two-layer structure portion in which the inner layer and the outer layer are bonded together. The elongated elastic elastic members 15 to 19 are provided at a predetermined elongation rate.

The sheet material 12S can be used without particular limitation as long as it is a sheet, but is preferably a non-woven fabric. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. 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. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

  As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. Hot melt bonding or heat sealing or ultrasonic bonding by various coating methods can be used for bonding the sheet material 12S of the exterior bodies 12F and 12B and fixing the elongated elastic elastic members 15 to 19 sandwiched therebetween. .

When the elongated elastic elastic members 15 to 19 are used, the same elastic elastic member can be provided uniformly, but it is preferable to vary the thickness, interval, and the like according to the positions of the exterior bodies 12F and 12B. For this reason, in the illustrated embodiment, a plurality of waist elastic elastic members 16 and 17 are vertically spaced along the width direction at a predetermined extension rate so that the waist portion W is continuous over the entire width direction. It is fixed in the extended state. Among the waist elastic elastic members 16, 17, one or more disposed in the region adjacent to the waist lower part U may overlap with the interior body 200, or the width direction overlaps with the interior body 200. You may each provide in the width direction both sides except a center part. The waist elastic elastic members 16 and 17 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1. the rubber thread ~1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. The waist elastic elastic members 16 and 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist W. .

  In addition, the waist lower portion U is formed of an elongated elastic elastic member so as to be continuous over the entire width direction at each of the upper side and both sides in the width direction, except for the center portion in the width direction that overlaps the interior body 200. A plurality of lower elastic elastic members 15 and 18 are fixed in a state where they are extended along the width direction at a predetermined extension rate with a space in the vertical direction.

The waist lower elastic elastic members 15 and 18 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1. the rubber thread ~1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, respectively elongation 200-350%, preferably fixed in particular about 240-300%.

  Further, the buttocks cover portion 14 is formed of an elongated elastic elastic member so as to be continuous over the entire width direction at each part on both sides in the width direction except for the center portion in the width direction overlapping the interior body 200. A plurality of partial elastic elastic members 19 are fixed in a state where they are extended along the width direction at a predetermined extension rate at intervals in the vertical direction.

As the elastic cover member 19 for the buttocks cover part, the thickness is 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , especially 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the drawing, the waist lower elastic elastic members 15 and 18 and the butt cover elastic elastic members 19 are provided on both sides in the width direction except for the central portion in the width direction overlapping the interior body 200. The interior body 200 does not shrink more than necessary in the width direction, so that it does not look bad or absorbs. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. At the center in the width direction, the elastic expansion / contraction member is finely cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are configured as the contraction force acting portions. Are also included. Of course, the arrangement of the waist lower elastic elastic members 15 and 18 and the buttocks cover elastic elastic member 19 is not limited to the above-described example, and the elastic force acts on the entire waist lower portion U in the width direction. A part or all of the lower elastic elastic members 15 and 18 and the buttocks cover elastic elastic member 19 may be provided across the interior body 200 from one side to the other side in the width direction.

  Characteristically, in both the abdominal exterior body 12F and the back exterior body 12B, the sheet material 12S is folded inward on both the waist side and the leg side, and the inner layer 12i is folded by the part folded back inside thereof. Is formed, and the front end portion 12r of the inner layer 12i formed by being folded back on the waist side covers the surface of the front and rear end portions of the interior body 200. The entire covering portion 12r may not be fixed to the surface of the interior body 200, or a part or all of the covering portion 12r may be fixed to the surface of the interior body 200 by a hot melt adhesive or welding. Thus, when the edges E1 of the waist and the edges of the leg openings E2 of the ventral exterior body 12F and the back exterior body 12B are all folds of the sheet material 12S, the edge feel becomes flexible. Further, when the front and rear ends of the interior body 200 are covered with the sheet material 12S that forms the ventral exterior body 12F and the back exterior body 12B, the front and back ends of the interior body 200 become soft.

  In the illustrated form, a portion where the waist side of the sheet material 12S is folded inward and a portion where the leg side of the sheet material 12S is folded inward are partially covered in the front-rear direction (in the illustrated form, the front and rear ends of the interior body 200 are covered). Although they are formed so as to overlap with each other, they may be formed so that they all overlap or not overlap at all.

  Further, in the illustrated embodiment, the folding position of the first region S1 at the time of manufacture is separated from the folded portion of the second region S2 to the outside in the CD direction, and the first region elastic elastic members 16 and 17 are provided in the separated portion 12d. Assuming the form, it is assumed that the waist elastic elastic members 16 and 17 are the first region elastic elastic members at the time of manufacture and the other elastic elastic members 15, 18 and 19 are the second region elastic elastic members at the time of the manufacture. (For this reason, the same reference numerals are used in the description of the manufacturing method), but can be appropriately changed, and the waist lower elastic elastic members 15 and 18 are added to the first region elastic elastic members at the time of manufacturing. A part may be included, and a part or all of waist elastic elastic members 16 and 17 may be included in the 2nd field elastic elastic member at the time of manufacture.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.
“Elongation rate” means a value when the natural length is 100%.
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 10 gf / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.
-The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

  The present invention can be used for a pants-type disposable diaper and its manufacture.

  L ... Intermediate part, T ... waist part, U ... waist lower part, W ... waist part, 11 ... liquid impervious sheet, 12B ... back side exterior body, 12A ... side seal part, 12F, 12B ... exterior body, 12F ... ventral side exterior body, 12S ... sheet material, 12b ... back side elastic band, 12d ... separation part, 12e ... edge sheet material, 12f ... ventral side elastic band, 15, 18 ... elastic lower part of waist lower part, 16 , 17 ... Elastic elastic member of the waist part, 30 ... Top sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Three-dimensional gather, 62 ... Gather sheet, 200 ... Interior body, 301 ... Second region folding -Elastic member attaching process, 302 ... Dividing and changing arrangement of elastic band, 303 ... Elastic member cutting process, 304 ... Interior body attaching process, 305 ... First region folding / elastic member attaching process, 306 ... Folding , 307 ... side joining step, 308 ... disconnection step, S1 ... first area, S2 ... second region, 16, 17 ... first region resilient and elastic members, 15, 18, 19 ... second region elastically stretchable member.

Claims (6)

An exterior body formed by joining both sides of the ventral exterior body and both sides of the back exterior body;
The interior body provided such that the front portion is joined to the center region in the width direction of the abdominal exterior body and the rear portion is joined to the center region in the width direction of the back exterior body, and passes through the crotch of the wearer. And comprising
In the method for producing a pants-type disposable diaper, wherein the ventral exterior body and the back exterior body are separated without being continuous on the crotch side,
A continuous sheet material is supplied along the continuous direction,
The second regions on both sides in the CD direction except for the first region in the CD direction in the sheet material are folded and joined to the center side in the CD direction with the center in the CD direction of the second region as the folding position, respectively. A stretchable band that is continuous in a band shape is formed by arranging a second region elastic stretchable member for imparting stretchability to the belly side exterior body and the backside exterior body between the sheet materials of the folded portion. ,
The stretch band is cut at the intermediate position in the CD direction of the first region, thereby forming a pair of ventral stretch band and dorsal stretch band ,
The CD direction positions of these ventral stretch bands and dorsal stretch bands are interchanged, or these ventral stretch bands and dorsal stretch bands are turned upside down, so that the second region is in the CD direction center side and the above The first area is rearranged outside the CD direction,
The pair of the ventral side stretchable band and the back side stretchable band which have been changed in arrangement are transported in parallel in the CD direction with a gap therebetween, and the separately manufactured interior body is supplied with a gap in the MD direction. the assembly of or on the line, the second region back surface of the ventral stretchable bands before-side portion of the inner body, and the back surface is the back side stretchable bands of rear portion of the inner body Are joined to each of the second regions to form an interior assembly.
The first region in the interior assembly is folded and joined to the center in the CD direction to a position covering the front-rear direction end of the interior body,
After the interior assembly with the first region folded back is folded in two in the CD direction, the ventral stretch band and the back stretch band are joined to the both side portions of each diaper, and the ventral side The elastic band and the back elastic band are cut at the boundary of each diaper, and the individual diaper in which the ventral outer body and the back outer body are respectively formed by the ventral elastic band and the back elastic band is manufactured. The
A method for producing a pants-type disposable diaper, characterized in that   The folding position of the first region is spaced outward in the CD direction from the folded portion of the second region, and between the sheet material of the folded portion of the first region in the separated portion, The manufacturing method of the underpants type disposable diaper of Claim 1 by which the 1st area | region elastic elastic member for providing a stretching property to a back side exterior body is arrange | positioned.   The folding position of the first region is aligned with the tip of the folded portion of the second region, and the belly-side exterior body and the back-side exterior body are made stretchable between the sheet materials of the folded portion of the first region. The manufacturing method of the underpants type disposable diaper of Claim 1 by which the 1st area | region elastic elastic member for providing is not arranged. An exterior body formed by joining both sides of the ventral exterior body and both sides of the back exterior body;
The interior body provided such that the front portion is joined to the center region in the width direction of the abdominal exterior body and the rear portion is joined to the center region in the width direction of the back exterior body, and passes through the crotch of the wearer. And comprising
In the method for producing a pants-type disposable diaper, wherein the ventral exterior body and the back exterior body are separated without being continuous on the crotch side,
A continuous sheet material is supplied along the continuous direction,
The second regions on both sides in the CD direction, except for the first region in the middle of the CD direction in the sheet material, are folded in two on the center side in the CD direction and joined between the sheet materials in the folded portion, By arranging a second region elastic elastic member for imparting stretchability to the abdominal exterior body and the back exterior body, a stretchable band that is continuous in a band shape is formed,
The stretch band is cut at the intermediate position in the CD direction of the first region, thereby forming a pair of ventral stretch band and dorsal stretch band ,
While the pair of ventral stretch bands and dorsal stretch bands are transported in parallel in the CD direction, the separately manufactured interior body is supplied with a spacing in the MD direction or on the line. the assembly in the in the CD direction central side portion of the first region of the surface of the front end portion is the ventral stretchable bands of the inner body, and wherein the surface of the end portion dorsal stretchable bands after said inner body The inner assembly is formed by being joined to each of the first region of the first region in the CD direction center side,
The first region and the second region on both sides in the CD direction of the interior assembly are folded back by being folded to the center side in the CD direction and the back surface side of the interior body, with the center in the CD direction of the first region being the folding position. Of the portion, the portion overlapping the first region is joined to the first region and the portion overlapping the interior body is joined to the interior body,
After the interior assembly in which the first region and the second region are folded is folded in the CD direction, the abdominal stretch band and the back stretch band are joined to each side portion of the diaper. The ventral stretch band and the back stretch band are cut at the boundaries of each diaper, and the ventral stretch body and the back stretch band form the ventral exterior body and the back exterior body, respectively. Diapers are manufactured,
A method for producing a pants-type disposable diaper, characterized in that   The folding position of the first region is spaced closer to the center in the CD direction than the folded portion of the second region, and between the sheet materials of the folded portion of the first region in the separated portion, the ventral-side exterior body The manufacturing method of the underpants type disposable diaper of Claim 4 by which the 1st area | region elastic elastic member for providing a stretching property to the backside exterior body is arranged.   The folding position of the first region is aligned with the tip of the folded portion of the second region, and the belly-side exterior body and the back-side exterior body are made stretchable between the sheet materials of the folded portion of the first region. The manufacturing method of the underpants type disposable diaper of Claim 4 with which the 1st area | region elastic elastic member for providing is not arranged.