WO2012057030A1 - Elastic sheet manufacturing method - Google Patents

Abstract

The disclosed manufacturing method is for continuously manufacturing an elastic sheet fixed in a state in which a elastic thread (7) extends between a pair of band-like sheets (50, 60) in a direction that intersects the y direction. The disclosed manufacturing method involves a supply step for introducing the elastic thread (7) onto a rotating arm (14) for winding the elastic thread; a conveying step for using the rotating arm (14) to continuously wind the elastic thread (7) onto a pair of conveyor belts (12, 13) and conveying, by means of the conveyor belts (12, 13), the elastic thread (7) between the band-like sheets (50, 60); and a cutting step for cutting the portion of the elastic thread (7) extending from both ends in the x direction of the band-like sheets (50, 60).

Description

Method for producing elastic sheet

The present invention relates to a method for producing an elastic sheet.

From the standpoint of saving materials as much as possible, reducing waste as much as possible, environmentally friendly, and reducing costs, a waist panel material with fastening tape is manufactured in a separate process, and the rectangular absorbency including the absorber An unfolded disposable diaper manufactured by adding this waist panel material to a main body is known. The waist panel material is preferably a stretchable member from the viewpoint of wearability, and the waist panel material is generally formed using a stretchable film. However, since a stretchable film is expensive, it is preferable to form a waist panel material using a so-called thread rubber that is a general-purpose elastic member. However, when the process of obtaining the waist panel material using the rubber thread and the process of adding the waist panel material to the absorbent main body to obtain the deployable disposable diaper are continuously performed in a series of flows, the rubber thread is used. The stretch direction of the waist panel material formed by using is generally the same direction as the transport direction of the absorbent main body, and is a direction orthogonal to the stretch direction of the waist panel material required when the unfolded disposable diaper is worn. Therefore, when manufacturing a deployable disposable diaper by adding a waist panel material formed using thread rubber to the absorbent main body in an in-line process, the waist panel material formed using thread rubber is inverted 90 degrees and absorbed. It is necessary to add to the sex body. Thus, since the apparatus which reverses a waist panel material 90 degree | times is needed separately, an increase in capital investment will be caused.

As a method not using the 90-degree reversing apparatus as described above, for example, in Patent Document 1 and Patent Document 2, an adhesive is applied to a water-permeable sheet that is running in the length direction, and the adhesive-coated surface is applied. A step of translating a tensioned thread-like elastic body in a zigzag state along the sheet surface of the traveling sheet and in the sheet traveling direction, and bonding the thread-like elastic body to the sheet in an extended state; The manufacturing method of the elastic sheet which performs the process of cut | disconnecting the said thread-like elastic body at both ends is described. Patent Document 1 also describes a method of rearranging the zigzag thread-like elastic bodies in parallel.

However, in the cutter used in the cutting process described in Patent Document 1 and Patent Document 2, it is difficult to cut the unnecessary portions of the both ends of the thread-like elastic body with a short length, and the produced stretchable sheet is poor in appearance. turn into. Further, Patent Document 1 and Patent Document 2 disclose nothing about the method of cutting the unnecessary portions at both ends of the thread-like elastic body by aligning them in a short length except that a roller cutter is simply arranged.

Further, in the techniques described in Patent Documents 1 and 2, the portion that extends from the edge in the width direction of the belt-like sheet after the stretched state in the thread-like elastic body is released remains in an irregular direction. As a result, the produced stretchable sheet is unsatisfactory.

JP-A-63-243309 JP 2010-22588 A

An object of the present invention is to provide a method for producing a stretchable sheet that can eliminate the above-mentioned drawbacks of the prior art.

This invention is a manufacturing method of the elastic sheet which manufactures continuously the elastic sheet which fixed the thread-like elastic body to the direction which cross | intersects the conveyance direction of this belt-shaped sheet between a pair of belt-shaped sheets.
The elastic sheet manufacturing method of the present invention includes a feeding step of continuously feeding out the thread-like elastic body and introducing the fed-out thread-like elastic body into an elastic body winding means, and using the elastic body winding means. The yarn-like elastic body is continuously wound around a pair of conveyance belts separated in a direction perpendicular to the sheet conveyance direction, and the yarn-like elastic body is conveyed by the pair of conveyance belts; An integration step of fixing the elastic body between the belt-like sheets, and a cutting step of cutting a portion of the thread-like elastic body extending from each of both ends in the width direction of the pair of belt-like sheets.

In the cutting step, it is preferable that the extended portion of the thread-like elastic body is cut while maintaining the extended state to remove the extended portion of the thread-like elastic body.

As the cutting step, after the integration step, a portion of the thread-like elastic body that extends from both edges in the width direction of the belt-like sheet is cut, and the wound state of the thread-like elastic body around the thread-conveying longitudinal structure A second cutting step that removes all or part of a portion of the thread-like elastic body extending from both edges in the width direction of the belt-like sheet, which is performed after the first cutting step. It is also preferable to provide a cutting step.

FIG. 1 is a plan view of a deployable disposable diaper in which a stretchable sheet obtained by the stretchable sheet manufacturing method of the present invention is used for a waist panel. FIG. 2 is a schematic view showing a manufacturing apparatus for manufacturing the waist panel of the unfolded disposable diaper shown in FIG. 1 according to the first embodiment of the present invention. FIG. 3 is a schematic view showing supply means for introducing a thread-like elastic body into the rotary arm shown in FIG. 3 is also a perspective view showing a configuration upstream of the rotating arm (elastic body winding means) of the apparatus shown in FIG. FIG. 4 is a schematic view of the manufacturing apparatus shown in FIG. 2 as viewed from the side. 5 is a cross-sectional view taken along line X1-X1 inside the pair of transport belts of the manufacturing apparatus shown in FIG. 6 is a cross-sectional view taken along line X2-X2 inside the pair of conveying belts of the manufacturing apparatus shown in FIG. FIG. 7 is a schematic view showing a manufacturing apparatus for manufacturing the waist panel of the unfolded disposable diaper shown in FIG. 1 according to the second embodiment of the present invention. FIG. 8 is a schematic view of the manufacturing apparatus shown in FIG. 7 as viewed from the side. FIG. 9 is a schematic view of a manufacturing apparatus for manufacturing the waist panel of the unfolded disposable diaper shown in FIG. 1 according to the third embodiment of the present invention as viewed from the side. 10 is a cross-sectional view of the cutting means of the manufacturing apparatus shown in FIG. FIG. 11: is the schematic which looked at the manufacturing apparatus which manufactures the waist panel of the unfoldable disposable diaper shown in FIG. 1 by the 4th embodiment of this invention from the side. 12 is a cross-sectional view of the cutting means of the manufacturing apparatus shown in FIG. FIG. 13 is a schematic view of a manufacturing apparatus for manufacturing the waist panel of the unfolded disposable diaper shown in FIG. 1 according to the fifth embodiment of the present invention as viewed from the side. 14 is a cross-sectional view of the cutting means of the manufacturing apparatus shown in FIG. FIG. 15 is a plan view showing a waist panel material and a deployable disposable diaper obtained by one embodiment of the present invention. FIG. 16: is a perspective view which shows the manufacturing apparatus of the elastic sheet used suitably for implementation of the manufacturing method of the 6th embodiment of this invention. FIG. 17 is a perspective view schematically showing an example of a cutting means for performing the second cutting step on the stretchable sheet 3A manufactured by the manufacturing apparatus shown in FIG. FIG. 18 is a perspective view (corresponding to FIG. 17) showing a seventh embodiment of the present invention. FIG. 19 is a perspective view of the cutting means of the manufacturing apparatus for manufacturing the waist panel of the unfolded disposable diaper shown in FIG. 1 according to the eighth embodiment of the present invention. 20 is a perspective view of the cutting means of the manufacturing apparatus for manufacturing the waist panel of the unfolded disposable diaper shown in FIG. 1 according to the ninth embodiment of the present invention.

Hereinafter, the manufacturing method of the elastic sheet of this invention is demonstrated, referring drawings based on the preferable embodiment.
As shown in FIG. 1, the stretchable sheet manufactured in the present embodiment is used for, for example, the waist panel 3 of the unfolded disposable diaper 1. Therefore, first, the unfoldable disposable diaper 1 using the stretchable sheet manufactured according to this embodiment for the waist panel will be described.

As shown in FIG. 1, the unfoldable disposable diaper 1 (hereinafter also referred to as “diaper 1”) includes a ventral side A located on the abdomen side of the wearer and a dorsal side B positioned on the dorsal side when worn. , And an absorbent main body 2 having a crotch C positioned between the abdominal side A and the back side B, and a pair of left and right waist panels 3, 3 connected to the left and right outside of the back side B And have. As shown in FIG. 1, the diaper 1 has a pair of left and right panel members 4, 4 connected to the left and right outer sides of the ventral side A. In addition, as shown in FIG. 1, the absorptive main body 2 of the diaper 1 has a rectangular shape in a state of being expanded in a planar shape. Moreover, as shown in FIG. 1, the panel material 4 of the diaper 1 has a trapezoidal shape in a state of being spread in a flat shape, and the lower bottom side having a long length is formed by an absorbent body or an adhesive body by means such as adhesive or fusion. 2 is fixed.
In the following description, the longitudinal direction of the absorbent main body 2 (also the longitudinal direction of the diaper 1) will be described as the Y direction, and the width direction of the absorbent main body 2 (also the width direction of the diaper 1) will be described as the X direction.

Each of the pair of waist panels 3 and 3 has a rectangular shape in a state of being expanded in a planar shape. Each waist panel 3 has two sheets 5, 6 and a plurality of thread-like elastic bodies 7 arranged between the two sheets 5, 6 in an extended state. Each waist panel 3 is made of a stretchable sheet that is fixed between a pair of sheets 5 and 6 in a state where the thread-like elastic body 7 extends in a direction intersecting the Y direction. Specifically, as shown in FIG. 1, each waist panel 3 extends in a direction (X direction) orthogonal to the Y direction between two rectangular sheets 5 and 6 having the same shape and the same size. The thread-like elastic bodies are formed at substantially equal intervals in the Y direction and integrally fixed by means such as an adhesive or fusion. A fastening tape 8 is fixed to the rectangular waist panel 3 formed in this way at an end portion on the outer side in the X direction by means such as adhesive or fusion. The rectangular waist panel 3 is fixed to the back side B of the absorbent main body 2 by means such as adhesive or fusion, and the X side inward in the X direction. It is connected to the direction. In addition, although the threadlike elastic body 7 which the waist panel 3 (elastic sheet) manufactured by this embodiment has extended | stretched in the direction orthogonal to a Y direction, if extended | stretched in the direction which cross | intersects the Y direction, Good.

In the present diaper 1, the stretchable sheet constituting the waist panel 3 is such that the sheet conveyance direction y at the time of manufacture is parallel to the Y direction, and the direction x perpendicular to the sheet conveyance direction at the time of manufacture coincides with the X direction. It is fixed to.

As shown in FIG. 1, the absorbent main body 2 includes a liquid-permeable top sheet 21, a liquid-impermeable or water-repellent back sheet 22, and a liquid-retaining property interposed between the two sheets 21 and 22. And an absorber 23. As shown in FIG. 1, the absorbent main body 2 includes a top sheet 21 that forms the inner surface of the diaper 1 and a back sheet 22 that forms the outer surface of the diaper 1, with an absorber 23 interposed between the two sheets 21 and 22. It is formed by joining. Moreover, the absorptive main body 2 is provided with three-dimensional guard forming sheets 24, 24 along both sides in the Y direction, as shown in FIG. The three-dimensional guard forming sheet 24 is fixed to the topsheet 21 along both sides in the Y direction of the absorbent main body 2. Each three-dimensional guard forming sheet 24 has a three-dimensional guard-forming elastic member 25 along the vicinity of the inner edge on the inner side in the X direction. A portion having a predetermined width is separated from the top sheet 21 to form a three-dimensional guard. Moreover, the elastic member 26 for leg gather formation is distribute | arranged to the part distribute | arranged around the leg of the longitudinal direction both sides of the absorptive main body 2. At the time of wearing, a leg gather is formed by the contraction of the elastic member 26 and fits well around the legs.

The material for forming the diaper 1 will be described.
As the sheet | seats 5 and 6 and the panel material 4 which comprise the waist panel 3, if normally used for absorbent articles, such as a disposable diaper, it can use without a restriction | limiting especially. For example, as the sheets 5 and 6 and the panel material 4, a non-woven fabric, a woven fabric, a film, or a laminated sheet thereof can be used. As the surface sheet 21 and the back surface sheet 22 constituting the absorbent main body 2, as long as they are usually used for absorbent articles such as disposable diapers, they can be used without particular limitation. For example, a hydrophilic and liquid-permeable non-woven fabric can be used as the top sheet 21, and a liquid-impermeable or water-repellent resin film or a laminate of a resin film and a non-woven fabric is used as the back sheet 22. be able to. As the absorbent body 23, an aggregate of fibers such as pulp fibers (may be a non-woven fabric) or an absorbent core in which water-absorbing polymer particles are held therein, a core wrap made of water-permeable thin paper or non-woven fabric. What was covered with the sheet | seat etc. can be used. As the three-dimensional guard forming sheet 24 constituting the three-dimensional guard, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.

Examples of the elastic member 25 constituting the thread-like elastic body 7 and the three-dimensional guard include natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, and polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene. A thread-like stretchable material made of, for example, can be used. In addition to circular and square cross sections, narrow band shapes such as ellipses and rectangular cross sections are included, and multifilament types can also be used. The width (or diameter) of the thread-like elastic member is, for example, 0.1 to 3 mm, and preferably 1 mm or less. As the fastening tape 8, for example, a tape formed by attaching a hook member of a mechanical fastener to one surface of a tape base material such as a nonwoven fabric by heat fusion or an adhesive can be used.

Next, a preferred first embodiment of the method for producing an elastic sheet of the present invention will be described with reference to the drawings, taking as an example the case of producing the waist panel 3 (elastic sheet) of the diaper 1 described above.
FIG. 2 schematically shows a manufacturing apparatus 11A that is preferably used in the method for manufacturing the waist panel 3 (elastic sheet) of this embodiment.

As shown in FIG. 2, the manufacturing apparatus 11 </ b> A is an apparatus that continuously manufactures the waist panel 3 (elastic sheet) and is a pair separated in a direction (x direction) perpendicular to the sheet conveyance direction (y direction). These conveyor belts 12 and 13 are provided with an elastic body winding rotary arm (elastic body winding means) 14 for continuously winding the thread-like elastic body 7. 2A and 2B, the manufacturing apparatus 11A continuously feeds the thread-like elastic body 7 and introduces the thread-like elastic body 7 into the rotating arm 14, and the pair of conveyances described above. The belt 12, 13 conveys the thread-like elastic body 7 between the pair of belt- like sheets 50, 60, and the pair of nip rollers 171, 172 is used to extend the pair of belt- like sheets 50, 60. Integral means 17 for fixing the thread-like elastic body 7 and cutting means 18 for cutting the portions of the thread-like elastic body 7 extending from both ends in the width direction of the belt- like sheets 50 and 60 are provided.

The conveyance direction of the sheet is the conveyance direction of the thread-like elastic body 7 wound around the pair of conveyance belts 12 and 13 or the conveyance direction of the sheet integrated with the thread-like elastic body 7 (band-like sheets 50 and / or 60). is there.
The y direction of the arrow in FIG. 2 indicates the conveyance direction of the thread-like elastic body 7 and the pair of belt- like sheets 50 and 60, which is the sheet conveyance direction, and finally the waist panel 3 (stretchable) manufactured according to this embodiment. The conveying direction of the sheet) and the conveying direction of the continuous body of the diaper 1 to which the waist panel 3 (elastic sheet) is attached are the same direction. Also, the x direction of the arrow in FIG. 2 is the width direction of the belt- like sheets 50 and 60, and is the direction orthogonal to the sheet conveying direction. 2 is a direction in which a pair of nip rollers 171 and 172 described later face each other.

As shown in FIG. 2, the conveying belt 12 of the conveying means 16 is an endless rotating belt, and includes an upper conveying belt 12a and a lower conveying belt 12b in two upper and lower stages. The upper conveyance belt 12a is stretched between pulleys 121 and 122 whose rotation axis direction is arranged in the z direction. The lower conveyance belt 12b is bridged between pulleys 124 and 125 whose rotation axis direction is arranged in the z direction. The pulley 121 is located on the downstream side of the pair of nip rollers 171 and 172 for fixing the elongated elastic body 7 between the pair of belt- like sheets 50 and 60, and the pulley 122 is located on the upstream side of the nip rollers 171 and 172. Is located. The pulley 124 is located on the downstream side of the nip rollers 171 and 172, and the pulley 125 is located on the upstream side of the nip rollers 171 and 172. The pulleys 121 and 124 are arranged at the same position in two upper and lower stages. Further, the pulleys 122 and 125 are also arranged in two upper and lower stages at the same position. Further, the pulley 121 (pulley 124) and the pulley 122 (pulley 125) are located outward in the x direction from the x direction end portions of the belt- like sheets 50 and 60. Each of the pulley 121 and the pulley 124 is provided with a servo motor (not shown) connected to its drive unit, so that the rotational speeds of the upper conveyance belt 12a and the lower conveyance belt 12b can be changed.

As shown in FIG. 2, the conveying belt 13 of the conveying means 16 is an endless rotating belt, similar to the conveying belt 12, and includes an upper conveying belt 13a and a lower conveying belt 13b in two upper and lower stages. The upper conveyance belt 13a is stretched between pulleys 131 and 132 whose rotation axis direction is arranged in the z direction. The lower conveyance belt 13b is bridged between pulleys 134 and 135 whose rotation axis direction is arranged in the z direction. The pulley 131 is located on the downstream side of the pair of nip rollers 171 and 172, and the pulley 132 is located on the upstream side of the nip rollers 171 and 172. The pulley 134 is located on the downstream side of the nip rollers 171 and 172, and the pulley 135 is located on the upstream side of the nip rollers 171 and 172. The pulleys 131 and 134 are arranged in two upper and lower stages at the same position. Further, the pulleys 132 and 135 are also arranged in two upper and lower stages at the same position. Further, the pulley 131 (pulley 134) and the pulley 132 (pulley 135) are located outward in the x direction from the x direction ends of the belt- like sheets 50 and 60. Each of the pulley 131 and the pulley 134 is provided with a servo motor (not shown) connected to its drive unit, and the rotational speed of each of the upper conveyance belt 13a and the lower conveyance belt 13b can be changed.

As shown in FIG. 2, the conveyor belt 12 (the upper conveyor belt 12 a and the lower conveyor belt 12 b) is bridged between the pulleys 121 and 122 and the pulleys 124 and 125 arranged as described above, and the pair of nip rollers 171. , 172 from the upstream side to the downstream side. Further, the conveyor belt 13 (the upper conveyor belt 13a and the lower conveyor belt 13b) is connected to the pulleys 131 and 132 and the pulleys 134 and 135 arranged as described above so that the upstream side of the pair of nip rollers 171 and 172. To the downstream side. Further, the transport belt 12 (upper transport belt 12a and lower transport belt 12b) and the transport belt 13 (upper transport belt 13a and lower transport belt 13b) are located outside the belt- like sheets 50 and 60 in the x direction and are symmetrical with each other. It is arranged in. The transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b) rotate so that their outer peripheral sides move in the y direction.

The transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b) are preferably timing belts. The rotational speeds of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b), that is, the driving units of the pulley 121 and pulley 124, and the pulley 131 and pulley 134, respectively. The rotation speed of a servo motor (not shown) arranged in the control is controlled by a control unit (not shown) provided in the manufacturing apparatus 11A.

As shown in FIG. 2, the rotating arm 14 includes an arm portion 141 having a shaft portion 142, a revolving portion 143, and a connecting portion 144, and a drive mechanism 147 that rotates the arm portion 141 around the center line of the shaft portion 142. And. The connecting portion 144 is coupled to each of the shaft portion 142 and the rotating portion 143 at an angle, and the rotating portion 143 and the shaft portion 142 are substantially parallel. The shaft portion 142 has an introduction port 145 for the thread-like elastic body 7 at one end thereof, and the circumferential portion 143 has a lead-out port 146 for the thread-like elastic body 7 at one end thereof, which is introduced from the introduction port 145. The thread-like elastic body 7 is smoothly led out from the outlet port 146 through the shaft portion 142, the connecting portion 144 and the rotating portion 143. Various known members (a driven roll, a low friction member, etc.) that can reduce friction with the thread-like elastic body 7 can be disposed in the bent portion of the arm portion 141, the outlet port 146, and the like.

In the circulation part 143, the position of the outlet 146 is downstream from the upstream end of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b). It is arranged in. The rotary arm 14 has a servo motor 148 attached to its drive part (shaft part 142), and the rotation part 143 causes the rotation part 143 to move the conveyor belt 12 (the upper conveyor belt 12a and the lower conveyor belt 12b) by the rotation of the servo motor 148. And the outer circumference of the conveyor belt 13 (the upper conveyor belt 13a and the lower conveyor belt 13b) is circulated. The diameter of the locus along which the outlet 146 rotates is greater than the distance between the outer surfaces of the pair of conveyor belts 12 and 13.
By such a rotating arm 14, the thread-like elastic body 7 taken in is fed to the upstream end of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b). It is a part and can be continuously wound on each outer peripheral side. The rotation speed of the rotary arm 14, that is, the rotation speed of the servo motor 148 is controlled by a control unit (not shown) provided in the manufacturing apparatus 11A.

As shown in FIG. 3, the elastic body supply means 15 is located on the downstream side of the bobbin 70 around which the thread-like elastic body 7 is wound, and a tensioner 151 that applies tension to the thread-like elastic body 7 by a brake, and on the downstream side of the tensor 151. A feeding roller 152 that is positioned to feed the thread-like elastic body 7 from the bobbin 70 and a tension measuring device 153 that is positioned downstream of the feeding roller 152 and measures the tension are provided. The feeding roller 152 has a rotational axis direction in the x direction. A servo motor (not shown) is attached to the driving portion of the feeding roller 152. The feeding roller 152 is used with the thread-like elastic body 7 wound around its outer periphery once or a plurality of times (preferably twice). A control unit (not shown) provided in the manufacturing apparatus 11A controls the rotation speed of a servo motor (not shown), that is, the rotation speed of the feeding roller 152, based on the detection output from the tension measuring device 153, and is elastic with a predetermined tension. The body 7 can be unwound from the bobbin 70.

The elastic body supply means 15 includes a feed roller 156 located on the downstream side of the feeding roller 152, as shown in FIG. The feed roller 156 is disposed between the rotating arm 14 and the feeding roller 152, and the rotation axis direction thereof is disposed in the x direction. The feed roller 156 has a servo motor (not shown) attached to its drive unit. The rotation speed of the servo motor (not shown), that is, the rotation speed of the feed roller 156 is controlled by a control unit (not shown) provided in the manufacturing apparatus 11A.

Integral means 17 includes a pair of nip rollers 171 and 172 as shown in FIGS. As the pair of nip rollers 171, 172, a metal cylindrical roller or a cylindrical roller made of low hardness silicon rubber can be used. The pair of nip rollers 171 and 172 has a servo motor (not shown) attached to any one of the drive units, and the rotation speed is controlled by a control unit (not shown) included in the manufacturing apparatus 11A. Drive transmission gears are attached to the rotation shafts of the pair of nip rollers 171 and 172, respectively. By this driving means (not shown), the rotation speed of a servo motor (not shown), that is, the rotation speed of one of the nip rollers 171 and 172 can be controlled based on the production speed of the stretchable sheet. At this time, when the drive transmission gear is engaged, the driving force is transmitted to the other nip rollers 172 and 171, and the pair of nip rollers 171 and 172 can be rotated. The bearing portions of the pair of nip rollers 171 and 172 use a force such as hydraulic pressure, pneumatic pressure, or spring in order to securely fix the elongated elastic body between the pair of belt- like sheets 50 and 60, Each bearing part is pressurized.

As shown in FIG. 2, the pair of nip rollers 171 and 172 includes an inner peripheral side of the transport belt 12 (upper transport belt 12a and lower transport belt 12b) and a transport belt 13 (upper transport belt 13a and lower transport belt 13b). It is located between the inner circumference side.

The cutting means 18 in the manufacturing apparatus 11A includes a pair of score cutter rollers 183 and an anvil roller 184 as shown in FIGS. The cutting means 18 is disposed on the inner portions of the pair of transport belts 12 and 13. More specifically, the pair of score cutter rollers 183 and the anvil roller 184 includes a pair of nip rollers 171 and 172 and rollers 123 and 126 of the transport belt 12 (upper transport belt 12a and lower transport belt 12b) in the y direction. Or it is located between the rollers 133 and 136 of the conveyor belt 13 (upper conveyor belt 13a, lower conveyor belt 13b). As shown in FIG. 2, the pair of score cutter roller 183 and anvil roller 184 includes an inner peripheral side of the transport belt 12 (upper transport belt 12a and lower transport belt 12b) and a transport belt 13 (upper transport) in the x direction. It is located between the belt 13a and the inner peripheral side of the lower conveyance belt 13b).

As shown in FIG. 6, the score cutter roller 183 on the upper side in the z direction includes cutter blades 185 and 185 extending in the circumferential direction on both outer circumferential surfaces in the x direction. In the manufacturing apparatus 11A, the cutter blade 185 is outside the x-direction outer end of the belt- like sheets 50, 60 folded to the outer surface side, and is conveyed with the x-direction outer end of the belt- like sheets 50, 60. Between the belt 12 (upper conveyance belt 12a, lower conveyance belt 12b) and the inner peripheral side of the belt- like sheets 50, 60 and the x direction outer ends of the belt- like sheets 50, 60 and the conveyance belt 13 (upper conveyance belt 13a, lower conveyance belt 13b). It is located between the circumferential side. The cutter blade 185 is circular when viewed from the side.

The anvil roller 184 on the lower side in the z direction is a longer roller in the x direction than the score cutter roller 183, as shown in FIG. The anvil roller 184 includes a cutter receiver 187 at a position corresponding to each cutter blade 185 of the score cutter roller 183. The cutter receiver 187 has a circular shape when viewed from the side. As shown in FIG. 6, the diameter of the circular cutter receiving portion 187 is larger than the diameter at the center in the x direction of the anvil roller 184 in the manufacturing apparatus 11 </ b> A, but need not be large. Good.

In the manufacturing apparatus 11A, the score cutter roller 183 and the anvil roller 184 have a servo motor (not shown) attached to the drive unit, and the rotation speed is controlled by a control unit (not shown) provided in the manufacturing apparatus 11A. Yes. The rotation speed of the cutter blade 185 of the score cutter roller 18 is basically the same as the rotation speed of the cutter receiver 187 of the anvil roller 184, but may be higher than the rotation speed of the cutter receiver 187. The rotational speed of the cutter blade 185 is the peripheral speed at the cutter blade 185 in the score cutter roller 18, and the rotational speed of the cutter receiver 187 is the peripheral speed at the cutter receiver 187 in the anvil roller 184. From the viewpoint of the cutability of the thread-like elastic body 7, it is preferable that the rotational speed of the cutter blade 185 is faster than the rotational speed of the cutter receiver 187, and the peripheral speed ratio of the rotational speed of the cutter blade 185 to the rotational speed of the cutter receiver 187 is It is 1 to 10, preferably 1 to 2, and more preferably 1 to 1.5. However, since the damage to the cutter blade 185 and the cutter receiver 187 is greater than when the rotation speed of the cutter blade 185 and the cutter receiver 187 is the same, the cutter blade 185 with respect to the rotation speed of the cutter receiver 187 is increased. The peripheral speed ratio of the rotational speed is appropriately determined according to the material (quality and thickness) of the filamentous elastic body 7 and the elongation rate. In addition, when the cutter receiving portion 187 of the anvil roller 184 is particularly soft, the cutter receiving portion 187 is worn out to form a groove, and the cutting performance is deteriorated. It is desirable to make a difference in the hardness of the cutter blade 185 of the portion 187 and the score cutter roller 183, and the cutter receiving portion 187 of the anvil roller 184 is preferably harder.

The cutting means 18 of the manufacturing apparatus 11A includes an integrated score cutter roller 183 in which a cutter roller and a pair of circular cutter blades 185 and 185 are integrally formed, as shown in FIG. However, instead of the integrated score cutter roller 183, a so-called holder-type cutter that holds a pair of circular cutter blades rotatably may be provided.
It is not always necessary to attach a servo motor (not shown) to the drive section of the score cutter roller 183. For example, in the case of a holder type cutter, the motor is not attached, and the cutter receiving section 187 is pressurized by applying pressure to the anvil roller 184. You may make it go along with rotation of.

As shown in FIGS. 4 and 6, in the manufacturing apparatus 11 </ b> A, the holding belt 191 of the thread-like elastic body 7 is located on the upper side in the z direction of the cutter receiving portions 187 and 187 on both sides of the anvil roller 184 in the x direction. , 191 are arranged. Since the pressing belts 191 and 191 are formed symmetrically, one pressing belt 191 will be described in the following description.

As shown in FIG. 4, the pressing belt 191 is bridged between pulleys 191a, 191b, and 191c whose rotation axis direction is arranged in the x direction. The pulley 191a is located on the downstream side of the anvil roller 184, the pulley 191c is located on the upstream side of the anvil roller 184, and the pulley 191b is located on the upstream side of the pulley 191c. The lower end in the z direction of the pulley 191a and the lower end in the z direction of the pulley 191c are located below the upper end in the z direction of the anvil roller 184. Therefore, as shown in FIG. 4, the holding belt 191 spanned between the pulleys 191a, 191b, 191c is in contact with a part of the outer periphery of the cutter receiving portion 187 of the anvil roller 184, and the anvil roller It is designed to be rotated along with the rotation of 184.

As shown in FIG. 2, the manufacturing apparatus 11 </ b> A has a thread-like shape located on both outer sides in the x direction of the pair of belt- like sheets 50 and 60 cut by the pair of score cutter rollers 183 and the anvil roller 184 that are cutting means 18. Suction portions 195 and 195 for sucking unnecessary portions of the elastic body 7 are provided. The suction portions 195 and 195 are arranged on both outer sides of the anvil roller 184 in the x direction. Note that the positions where the suction portions 195 and 195 are disposed may be disposed on the downstream side of the pressing belt 191 and the cutter receiving portion 187 that are separated from each other after the contact.

Next, a method for manufacturing an elastic sheet using the manufacturing apparatus 11A described above will be described.

First, as shown in FIG. 3, the thread-like elastic body 7 is continuously drawn out, and the drawn-out thread-like elastic body 7 is introduced into the rotating arm 14 for winding the elastic body (supplying step). More specifically, the thread-like elastic body 7 is continuously fed out from the bobbin 70 around which the thread-like elastic body 7 is wound using the feeding roller 152. At the time of unwinding, the rotation speed of the unwinding roller 152 is controlled by a control unit (not shown) provided in the manufacturing apparatus 11 based on the detection output of the tension of the filamentous elastic body 7 by the tension measuring device 153, and at a predetermined tension. The thread-like elastic body 7 is fed out from the bobbin 70.

Next, the thread-like elastic body 7 is introduced into the rotating arm 14. At the time of introduction, the winding speed at which the thread-like elastic body 7 stretched to a predetermined stretching stress by the tensor 151 and the feeding roller 152 is wound around the pair of conveying belts 12 and 13 by the rotating arm 14. The feed roller 156 supplies the rotating arm 14 at the above speed. Here, the “winding speed” means one round of rotation around the outer peripheral side of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and the outer periphery of the transport belt 13 (upper transport belt 13a, lower transport belt 13b). It means a value obtained by dividing the length of the thread-like elastic body 7 by the time required for one round.

Next, as shown in FIG. 2 and FIG. 4, the thread-like elastic body 7 is continuously wound around the pair of transport belts 12 and 13 using the rotating arm 14, and the thread-like elastic body 7 is attached by the pair of transport belts 12 and 13. Transport (transport process). More specifically, the thread-like elastic body 7 supplied into the rotating arm 14 in the extended state is introduced into the arm portion 141 from the introduction port 145, passes through the shaft portion 142, the connecting portion 144, and the rotating portion 143. Derived from the outlet 146. The thread-like elastic body 7 led out from the lead-out port 146 is led out while the rotary arm 14 is rotated, so that the outer peripheral side at the upstream end of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and It is wound around the outer peripheral side at the upstream end of the transport belt 13 (upper transport belt 13a, lower transport belt 13b). Here, the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b) and the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b) are rotated by the rotational travel of the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b). ) And the outer periphery of the conveyor belt 13 (upper conveyor belt 13a, lower conveyor belt 13b), the thread-like elastic body 7 is continuously wound in a spiral shape. The continuously wound thread-like elastic body 7 is conveyed between the pair of downstream belt- like sheets 50 and 60.

Here, the thread-like elastic body 7 wound around the pair of transport belts 12 and 13 extends in a direction intersecting the y direction, and is not arranged in a direction orthogonal to the y direction. In order to correct the wound elastic body 7 in a direction (x direction) orthogonal to the y direction, for example, when the elastic thread 7 is wound as shown in FIG. 12, the rotational speed of the upper transport belt 12 a is made slower than the rotational speed of the lower transport belt 12 b, and the rotational speed of the lower transport belt 13 b is made slower than the rotational speed of the upper transport belt 13 a in the transport belt 13. Thus, the inclination of the thread-like elastic body 7 is gradually changed during the conveyance in the y-direction, and the inclination of the thread-like elastic body 7 is orthogonal to the y-direction before being conveyed between the pair of belt-like sheets 50 and 60 ( x direction).

As shown in FIG. 2, the belt-like sheet 50 is previously folded at both ends in the x direction on the outer surface side by folding guides (not shown) and the like, and the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt). 12b) and the upper side of the conveyor belt 13 (the upper conveyor belt 13a and the lower conveyor belt 13b) are supplied between the pair of nip rollers 171 and 172. In addition, as shown in FIG. 2, the belt-like sheet 60 is previously folded at both ends in the x direction on the outer surface side by folding guides (not shown) or the like, and the conveyor belt 12 (upper conveyor belt 12a, lower conveyor) The belt is supplied between the pair of nip rollers 171 and 172 from the lower side of the conveyor belt 12b) and the conveyor belt 13 (upper conveyor belt 13a, lower conveyor belt 13b). In addition, before the strip | belt-shaped sheet 50 and / or the strip | belt-shaped sheet 60 are supplied between a pair of nip rollers 171,172, the adhesive agent is apply | coated to the inner surface side. The adhesive may be applied on the entire surface in a spiral shape, or may be applied in a planar shape or a stripe shape.

Next, the thread-like elastic body 7 is fixed in an extended state between the pair of belt- like sheets 50 and 60 using the nip rollers 171 and 172 (integration step). In the integration step, the thread-like elastic body 7 is attached between the belt-like sheets 50.60 in a state where the thread-like elastic body 7 is wound around the pair of conveying belts 12 and 13. More specifically, a continuous body in which the continuously wound thread-like elastic body 7 is disposed between the pair of belt- like sheets 50 and 60 is supplied between the pair of nip rollers 171 and 172, and the pair of belt-like sheets 50. , 60 is fixed in a stretched state. In the manufacturing apparatus 11A, the thread-like elastic body 7 is supplied between the pair of belt- like sheets 50 and 60 via the nip rollers 171 and 172 while being wound around the conveyor belts 12 and 13, so It can be securely put in place without being affected by the cut.

Next, the portions of the thread-like elastic body 7 extending from both ends in the width direction (x direction) of the pair of belt- like sheets 50 and 60 are cut (cutting step). In the cutting step, the thread-like elastic body 7 is wound around the pair of transport belts 12 and 13 by using cutting means (score cutter roller 183 and anvil roller 184) disposed on the inner portions of the pair of transport belts 12 and 13. In this state, the thread-like elastic body 7 is cut. Further, in the cutting step, the extending portion of the thread-like elastic body 7 is cut by maintaining the extended state by using means for pressing the extending portion of the thread-like elastic body 7 only from above. remove. More specifically, as shown in FIG. 2, the belt-like sheet 50 in a state in which the thread-like elastic body 7 is wound around the pair of conveying belts 12 and 13 by the score cutter roller 183 having the cutter blade 185 and the anvil roller 184. , 60 is a portion of the thread-like elastic body 7 located outward from both outer ends in the x direction, that is, the thread-like elastic body 7 not fixed between the pair of belt- like sheets 50, 60, and the thread-like elastic body. Cut the remaining part of 7. In the manufacturing apparatus 11 </ b> A, as shown in FIGS. 4 and 6, the holding belt 191 that is in contact with a part of the outer periphery of the cutter receiving portion 187 of the anvil roller 184 and rotates with the rotation of the anvil roller 184. Therefore, it is possible to cut the thread-like elastic body 7 with the cutter blade 185 while reliably pressing the extending part of the thread-like elastic body 7 from above. The parts are short and aligned, improving the appearance of the produced elastic sheet. In addition, since the unnecessary portion of the thread-like elastic body 7 cut by the cutter blade 185 can be conveyed to the suction portions 195 and 195 while being pressed between the presser belt 191 and the cutter receiving portion 187, the manufacturing apparatus 11A It is possible to prevent the unnecessary portion of the cut thread-like elastic body 7 from being mixed into the product.

Next, both ends in the x direction of the belt- like sheets 50 and 60 folded on the outer surface side are refolded by a folding guide (not shown) or the like, and the thread-like elastic body 7 is placed between the pair of belt- like sheets 50 and 60. A belt-like stretchable sheet fixed in a state of extending in a direction crossing the direction can be continuously produced. “Refolding” is to expand the folded portion. The manufactured belt-like stretchable sheet is intermittently cut in the x direction by a known cutting means (not shown). The interval of intermittently cutting is the same as the size of the waist panel 3 provided in the diaper 1. Thereby, the waist panel 3 (elastic sheet) can be manufactured continuously.

As a manufacturing method of the diaper 1 provided with the waist panel 3, a conveyance direction (y direction) is performed between a continuous body of the top sheet 21, a continuous body of the back sheet 22, and a continuous body of both sheets 21, 22 by a known method. Are provided with a plurality of elastic members 25 and a three-dimensional guard forming sheet which are intermittently provided with a plurality of absorbers 23, 23... And extended on both sides in the conveying direction (y direction) of the continuous body of the topsheet 21. A continuous body of the absorbent main body 2 in which 24 continuous bodies are arranged is manufactured in a separate process. A pair of waist panels 3 are included in the continuous body of the absorbent main body 2 so as to protrude outward in the x direction while transporting the manufactured continuous body of the absorbent main body 2 in the transport direction (y direction). The continuous body of the diaper 1 distribute | arranged for every absorber 33 to be manufactured is manufactured. Here, the conveyance direction (y direction) of the continuous body of the absorbent main body 2 and the conveyance direction (y direction) when manufacturing the waist panel 3 (elastic sheet) are the same direction, and the waist panel 3 (extension and contraction). It is not necessary to invert the adhesive sheet) by 90 °. Then, the diaper 1 can be manufactured by cutting the continuous body into dimensions of individual diapers 1 by a known cutting means (not shown).

In the cutting step in the present invention, the portions extending from both ends in the width direction of the pair of belt-like sheets may be cut so that the lengths of the thread-like elastic bodies included in the elastic sheet to be manufactured are uniform. preferable.

Hereinafter, the preferable 2nd embodiment of the manufacturing method of the elastic sheet of the present invention is explained, referring to drawings, taking the case where the waist panel 3 (elastic sheet) of diaper 1 mentioned above is manufactured as an example.
7 and 8 schematically show a manufacturing apparatus 11B that is suitably used in the method for manufacturing the waist panel 3 (elastic sheet) of the second embodiment.
About the manufacturing apparatus 11B of 2nd Embodiment, a different point from 11A of manufacturing apparatuses is demonstrated. The points that are not particularly described are the same as those of the manufacturing apparatus 11A, and the description of the manufacturing apparatus 11A is appropriately applied. 7 and 8, the same parts as those in FIGS. 2 to 6 are denoted by the same reference numerals.

As shown in FIGS. 7 and 8, the manufacturing apparatus 11 </ b> B uses a composite sheet in which the thread-like elastic body 7 is fixed in a stretched state between the pair of belt- like sheets 50 and 60 by the integration unit 17. Between the 183 and the anvil roller 184, a pair of upper and lower sheet conveying belts 150 and 160 are provided.

As shown in FIG. 8, the sheet conveying belt 150 is arranged between the cutter blades 185 and 185 of the score cutter roller 183 in the x direction, and between the rollers 150a and 150b whose rotation axis direction is arranged in the x direction. It is stretched over. Each of the rollers 150a and 150b has a servo motor (not shown) attached to one of the drive units, and the rotation speed of the sheet conveying belt 150 is controlled by a control unit (not shown). The roller 150a is positioned downstream of the score cutter roller 183 in the y direction, and the roller 150b is positioned upstream of the score cutter roller 183 in the y direction.

As shown in FIG. 8, the sheet conveyance belt 160 is arranged between the cutter blades 185 and 185 of the score cutter roller 183 in the x direction, and between the rollers 160a and 160b whose rotation axis direction is arranged in the x direction. It is stretched over. Each of the rollers 160a and 160b has a servo motor (not shown) attached to one of the drive units, and the rotation speed of the belt 160 is controlled by a control unit (not shown). The roller 160a is located downstream of the anvil roller 184 in the y direction, and the roller 160b is located upstream of the anvil roller 184 in the y direction.

Next, a method for manufacturing an elastic sheet using the manufacturing apparatus 11B described above will be described. In the second embodiment, the description in detail regarding the first embodiment is appropriately applied to points that are not particularly described.

First, as in the first embodiment, the thread-like elastic body 7 is continuously fed out, the fed-out thread-like elastic body 7 is introduced into the rotating arm 14 for winding the elastic body (supplying step), and then the rotating arm 14 Is used to continuously wind the thread-like elastic body 7 around the pair of transport belts 12 and 13 and transport the thread-like elastic body 7 by the pair of transport belts 12 and 13 (transport process). The thread-like elastic body 7 is fixed in an extended state between the pair of belt-like sheets 50 and 60 (integration step). Next, in the second embodiment, as shown in FIG. 7, the belt-like sheet 50, between the belt 150 spanned between the rollers 150a and 150b and the belt 160 spanned between the rollers 160a and 160b, The composite sheet is fed between a pair of score cutter rollers 183 and anvil rollers 184 while sandwiching the composite sheet in which the thread-like elastic body 7 is fixed in an extended state between 60 and 60. In this way, while sandwiching the composite sheet in which the thread-like elastic body 7 is fixed in an extended state between the belt- like sheets 50 and 60, the composite sheet is supplied between the pair of score cutter rollers 183 and the anvil roller 184, Since means for pressing the extending portion of the thread-like elastic body 7 from above and below is used, the thread-like elastic body 7 can be held without being stretched more than necessary, and is stably stretched. Can be cut while holding (cutting step).

Thereafter, in the second embodiment, the thread-like elastic body 7 is extended in a direction intersecting the y direction between the pair of belt- like sheets 50 and 60 by performing the same steps as in the first embodiment (see FIG. 7). A belt-like stretchable sheet fixed in a state can be continuously produced.

Hereinafter, the 3rd preferable embodiment of the manufacturing method of the elastic sheet of this invention is demonstrated, referring drawings for the case where the waist panel 3 (elastic sheet) of the diaper 1 mentioned above is manufactured as an example.
9 and 10 schematically show a manufacturing apparatus 11C that is suitably used in the method for manufacturing the waist panel 3 (elastic sheet) of the third embodiment.
About the manufacturing apparatus 11C of 3rd Embodiment, a different point from 11A of manufacturing apparatuses is demonstrated. The points that are not particularly described are the same as those of the manufacturing apparatus 11A, and the description of the manufacturing apparatus 11A is appropriately applied. In FIGS. 9 and 10, the same parts as those in FIGS. 2 to 6 are denoted by the same reference numerals.

As shown in FIG. 9, the manufacturing apparatus 11 </ b> C includes a pair of score cutter rollers 183 and anvil rollers 184, the outer ends in the x direction, and the inner peripheral side of the transport belt 12 (upper transport belt 12 a and lower transport belt 12 b). Between the pair of score cutter rollers 183 and anvil roller 184 in the z direction between the outer ends in the x direction and the inner peripheral side of the transport belt 13 (upper transport belt 13a, lower transport belt 13b). Belts 193 and 194 are provided. Since the pair of upper and lower belts 193 and 194 are formed symmetrically, in the following description, one belt 193 and 194 will be described.

As shown in FIG. 9, the belt 193 is bridged between rollers 193a and 193b whose rotation axis direction is arranged in the x direction. Each of the rollers 193a and 193b has a servo motor (not shown) attached to one of the drive units, and the rotation speed of the belt 193 is controlled by a control unit (not shown). The roller 193a is positioned downstream of the rotation axis center of the score cutter roller 183 in the y direction, and the roller 193b is positioned upstream of the rotation axis center of the score cutter roller 183 in the y direction.

As shown in FIG. 9, the belt 194 is bridged between rollers 194 a and 194 b in which the rotation axis direction is arranged in the x direction. Each of the rollers 194a and 194b has a servo motor (not shown) attached to one of the drive units, and the rotation speed of the belt 194 is controlled by a control unit (not shown). The roller 194a is disposed between the roller 193a and the roller 193b over which the belt 193 is bridged in the y direction, and is disposed at substantially the same position as the rotation axis center of the anvil roller 184. The roller 194b is located upstream of the roller 193b of the belt 193 in the y direction. The lower end in the z direction of the roller 193a spanned by the belt 193 and the lower end in the z direction of the roller 193b are positioned below the upper end in the z direction of the roller 194a and the upper end in the z direction of the roller 194b, respectively. To do. Therefore, the belt 193 spanned between the rollers 193a and 193b and the belt 194 spanned between the rollers 194a and 194b are in contact with each other over a part of the region, and between the belt- like sheets 50 and 60. A surplus portion of the thread-like elastic body 7 located outward in the x direction of the composite sheet to which the thread-like elastic body 7 is fixed in an extended state is sandwiched between the belt 193 and the belt 194.

Next, a method for producing an elastic sheet using the above-described production apparatus 11C will be described. In the third embodiment, the description in detail regarding the first embodiment is applied as appropriate to points that are not particularly described.

First, as in the first embodiment, the thread-like elastic body 7 is continuously fed out, the fed-out thread-like elastic body 7 is introduced into the rotating arm 14 for winding the elastic body (supplying step), and then the rotating arm 14 Is used to continuously wind the thread-like elastic body 7 around the pair of transport belts 12 and 13 and transport the thread-like elastic body 7 by the pair of transport belts 12 and 13 (transport process). The thread-like elastic body 7 is fixed in an extended state between the pair of belt-like sheets 50 and 60 (integration step). Next, in the third embodiment, as shown in FIGS. 9 and 10, the thread-like elastic body located outside the x-direction of the composite sheet in which the thread-like elastic body 7 is fixed in an extended state between the belt- like sheets 50 and 60. 7 is pressed between the belt 193 and the belt 194 from above and from below, and the remainder of the thread-like elastic body 7 is held between the pair of score cutter rollers 183 and anvil rollers 184. Supply. In the manufacturing apparatus 11C, as shown in FIG. 9, the thread-like elastic body 7 can be cut by the cutter blade 185 while the extending portion of the thread-like elastic body 7 is sandwiched between the belt 193 and the belt 194. Unnecessary portions at both ends of the thread-like elastic body 7 are shortly aligned, so that the appearance of the produced elastic sheet is improved. Moreover, since the unnecessary part of the thread-like elastic body 7 cut by the cutter blade 185 can be conveyed to the suction portions 195 and 195 by the belt 193 and the belt 194, the manufacturing apparatus 11C is hardly soiled.

Thereafter, in the third embodiment, the same process as in the first embodiment is performed to fix the thread-like elastic body 7 between the pair of belt- like sheets 50 and 60 so as to extend in a direction intersecting the y direction. The elastic sheet can be produced continuously.

Hereinafter, the preferable 4th embodiment of the manufacturing method of the elastic sheet of this invention is described, referring to drawings, taking the case where the waist panel 3 (elastic sheet) of the diaper 1 mentioned above is manufactured as an example.
11 and 12 schematically show a manufacturing apparatus 11D that is suitably used in the method for manufacturing the waist panel 3 (elastic sheet) of the fourth embodiment.
About manufacturing apparatus 11D of 4th Embodiment, a different point from manufacturing apparatus 11A is demonstrated. The points that are not particularly described are the same as those of the manufacturing apparatus 11A, and the description of the manufacturing apparatus 11A is appropriately applied. 11 and 12, the same parts as those in FIGS. 2 to 6 are denoted by the same reference numerals.

Unlike the manufacturing apparatus 11A of the first embodiment, the manufacturing apparatus 11D of the fourth embodiment fixes the thread-like elastic body 7 between the pair of belt- like sheets 50 and 60 in an extended state, and at the same time extends the thread-like elastic body. 7 is provided with a cutting means 18 for cutting the portion 7 while maintaining the extended state.
The cutting means 18 of the manufacturing apparatus 11D includes a pair of nip rollers 171 and 172 as shown in FIGS. As the pair of nip rollers 171, 172, a metal cylindrical roller or a cylindrical roller made of low hardness silicon rubber can be used. The pair of nip rollers 171 and 172 has a servo motor (not shown) attached to one of the drive units, and the rotation speed is controlled by a control unit (not shown). Drive transmission gears are attached to the rotation shafts of the pair of nip rollers 171 and 172, respectively. By this driving means (not shown), the rotation speed of a servo motor (not shown), that is, the rotation speed of one of the nip rollers 171 and 172 can be controlled based on the production speed of the stretchable sheet. At this time, when the drive transmission gear is engaged, the driving force is transmitted to the other nip rollers 172 and 171, and the pair of nip rollers 171 and 172 can be rotated. The bearing portions of the pair of nip rollers 171 and 172 use a force such as hydraulic pressure, pneumatic pressure, or spring in order to securely fix the elongated elastic body between the pair of belt- like sheets 50 and 60, Each bearing part is pressurized.

The nip rollers 171 and 172 of the manufacturing apparatus 11D are formed between the inner peripheral side of the transport belt 12 (upper transport belt 12a and lower transport belt 12b) and the inner peripheral side of the transport belt 13 (upper transport belt 13a and lower transport belt 13b). Located between. In the manufacturing apparatus 11D, the upper nip roller 171 includes cutter blades 176 and 176 extending in the circumferential direction on both outer circumferential surfaces in the x direction, as shown in FIG. In the manufacturing apparatus 11 </ b> D, the cutter blade 176 is positioned outward from the x direction outer end of the belt- like sheets 50 and 60 folded to the outer surface side.

In the manufacturing apparatus 11D, the lower nip roller 172 is a roller that is longer in the x direction than the nip roller 171 and corresponds to the cutter blades 176 and 176 of the upper nip roller 171 as shown in FIG. Cutter receiving portions 178 and 178 are provided at the positions. The nip roller 172 includes extending portions 179 and 179 at both ends in the x direction outside the cutter receiving portions 178 and 178 in the x direction.
The cutter receivers 178 and 178 are circular when viewed from the side, and the diameter of the cutter receiver 178 is substantially the same as the diameter of the nip roller 172 at the center in the x direction.
The extending portion 179 has a circular shape when viewed from the side.
As described above, the pair of nip rollers 171 and 172 according to the present embodiment is not only the integration unit 17 but also the cutting unit 18.

In the manufacturing apparatus 11D, as shown in FIGS. 11 and 12, holding belts 191 and 191 of the thread-like elastic body 7 are provided on the upper sides of the extended portions 179 and 179 on both sides in the x direction of the nip roller 172, respectively. It is arranged. Since the pressing belts 191 and 191 are formed symmetrically, one pressing belt 191 will be described in the following description.

As shown in FIG. 11, the pressing belt 191 is bridged between pulleys 191a, 191b, and 191c whose rotation axis direction is arranged in the x direction. The pulley 191a is located on the downstream side of the nip roller 172, the pulley 191c is located on the upstream side of the nip roller 172, and the pulley 191b is located on the upstream side of the pulley 191c. The lower end in the z direction of the pulley 191a and the lower end in the z direction of the pulley 191c are located below the upper end in the z direction of the extending portion 179 of the nip roller 172. Accordingly, the holding belt 191 spanned between the pulleys 191a, 191b, and 191c is in contact with a part of the outer periphery of the extended portion 179 of the nip roller 172, and rotates with the rotation of the nip roller 172. It is like that.

Next, a method for manufacturing an elastic sheet using the manufacturing apparatus 11D described above will be described. In the fourth embodiment, the description in detail regarding the first embodiment is applied as appropriate to points that are not particularly described.

First, as in the first embodiment, the thread-like elastic body 7 is continuously fed out, the fed-out thread-like elastic body 7 is introduced into the rotating arm 14 for winding the elastic body (supplying step), and then the rotating arm 14 Is used to continuously wind the thread-like elastic body 7 around the pair of transport belts 12 and 13 and transport the thread-like elastic body 7 by the pair of transport belts 12 and 13 (transport process). Next, in the fourth embodiment, the thread-like elastic body 7 is fixed in an extended state between the pair of belt-like sheets 50 and 60 (integration step), and at the same time, the portion of the extending thread-like elastic body 7 is in an extended state. Cutting while holding (cutting step). More specifically, a continuous body in which the continuously wound thread-like elastic body 7 is disposed between the pair of belt- like sheets 50 and 60 is supplied between the pair of nip rollers 171 and 172, and the pair of belt-like sheets 50. , 60 is fixed in a stretched state. In the manufacturing apparatus 11D, as shown in FIG. 12, the portion of the thread-like elastic member 7 extended in the x direction by the nip roller 171 having the cutter blade 176 and the nip roller 172, that is, between the pair of belt- like sheets 50, 60. A thread-like elastic body 7 that is not fixed to the thread-like elastic body 7 is cut while the remaining portion of the thread-like elastic body 7 is maintained in an expanded state. In the manufacturing apparatus 11 </ b> D, as shown in FIGS. 11 and 12, the pressing belt 191 that is in contact with a partial area of the outer periphery of the extended portion 179 of the nip roller 172 and rotates with the rotation of the nip roller 172. Therefore, it is possible to cut the thread-like elastic body 7 with the cutter blade 176 while reliably pressing the part of the thread-like elastic body 7 extending in the x direction only from the upper direction. Unnecessary parts are aligned shortly, and the appearance of the produced elastic sheet is improved. Moreover, since the unnecessary part of the thread-like elastic body 7 cut by the cutter blade 176 can be conveyed to the suction portions 195 and 195 by the presser belt 191, the manufacturing apparatus 11D is hardly soiled.

Thereafter, in the fourth embodiment, the same process as in the first embodiment is performed, and the band-like elastic body 7 is fixed between the pair of belt- like sheets 50 and 60 so as to extend in a direction intersecting the y direction. The elastic sheet can be produced continuously.

Hereinafter, the preferable 5th embodiment of the manufacturing method of the elastic sheet of this invention is demonstrated, referring drawings, for the case where the waist panel 3 (elastic sheet) of the diaper 1 mentioned above is manufactured as an example.
FIGS. 13 and 14 schematically show a manufacturing apparatus 11E suitably used in the method for manufacturing the waist panel 3 (elastic sheet) of the fifth embodiment.
About the manufacturing apparatus 11E of 5th Embodiment, a different point from 11A of manufacturing apparatuses is demonstrated. The points that are not particularly described are the same as those of the manufacturing apparatus 11A, and the description of the manufacturing apparatus 11A is appropriately applied. 13 and 14, the same parts as those in FIGS. 2 to 6 are denoted by the same reference numerals.

Unlike the manufacturing apparatus 11A of the first embodiment, the manufacturing apparatus 11E of the fifth embodiment fixes the thread-like elastic body 7 in a stretched state between the pair of belt- like sheets 50 and 60 and simultaneously extends the thread-like elastic body. 7 is provided with a cutting means 18 for cutting the portion 7 while maintaining the extended state.
The cutting means 18 of the manufacturing apparatus 11E includes a pair of nip rollers 171 and 172 as shown in FIGS. As the pair of nip rollers 171, 172, a metal cylindrical roller or a cylindrical roller made of low hardness silicon rubber can be used. The pair of nip rollers 171 and 172 has a servo motor (not shown) attached to one of the drive units, and the rotation speed is controlled by a control unit (not shown). Drive transmission gears are attached to the rotation shafts of the pair of nip rollers 171 and 172, respectively. By this driving means (not shown), the rotation speed of a servo motor (not shown), that is, the rotation speed of one of the nip rollers 171 and 172 can be controlled based on the production speed of the stretchable sheet. At this time, when the drive transmission gear is engaged, the driving force is transmitted to the other nip rollers 172 and 171, and the pair of nip rollers 171 and 172 can be rotated. The bearing portions of the pair of nip rollers 171 and 172 use a force such as hydraulic pressure, pneumatic pressure, or spring in order to securely fix the elongated elastic body between the pair of belt- like sheets 50 and 60, Each bearing part is pressurized.

The nip rollers 171 and 172 of the manufacturing apparatus 11E are formed between the inner peripheral side of the transport belt 12 (upper transport belt 12a and lower transport belt 12b) and the inner peripheral side of the transport belt 13 (upper transport belt 13a and lower transport belt 13b). Located between. As shown in FIG. 14, the upper nip roller 171 includes cutter blades 176 and 176 extending in the circumferential direction on both outer circumferential surfaces in the x direction, as shown in FIG. 14. In the manufacturing apparatus 11E, the cutter blade 176 is located outward from the x direction outer end of the belt- like sheets 50 and 60 folded to the outer surface side.

In the manufacturing apparatus 11E, the lower nip roller 172 includes cutter receiving portions 178 and 178 at positions corresponding to the cutter blades 176 and 176 of the upper nip roller 171 as shown in FIG. The cutter receivers 178 and 178 are circular when viewed from the side, and the diameter of the cutter receiver 178 is substantially the same as the diameter of the nip roller 172 at the center in the x direction.
As described above, the pair of nip rollers 171 and 172 according to the present embodiment is not only the integration unit 17 but also the cutting unit 18.

In the manufacturing apparatus 11E, as shown in FIGS. 13 and 14, the outer ends of the pair of nip rollers 171 and 172 in the x direction and the inner peripheral side of the conveyor belt 12 (the upper conveyor belt 12a and the lower conveyor belt 12b) A pair of belts 193 and 194 are provided in the z direction between the outer end of the pair of nip rollers 171 and 172 in the x direction and the inner peripheral side of the transport belt 13 (upper transport belt 13a and lower transport belt 13b). A pair of upper and lower belts 193 and 194 are provided in the z direction therebetween. Since the pair of upper and lower belts 193 and 194 are formed symmetrically, in the following description, one belt 193 and 194 will be described.

As shown in FIG. 13, the belt 193 is bridged between rollers 193 a and 193 b in which the rotation axis direction is arranged in the x direction. Each of the rollers 193a and 193b has a servo motor (not shown) attached to one of the drive units, and the rotation speed of the belt 193 is controlled by a control unit (not shown). The roller 193a is positioned downstream of the rotation axis center of the nip roller 171 in the y direction, and the roller 193b is positioned upstream of the rotation axis center of the nip roller 171 in the y direction.

As shown in FIG. 13, the belt 194 is bridged between rollers 194 a and 194 b in which the rotation axis direction is arranged in the x direction. Each of the rollers 194a and 194b has a servo motor (not shown) attached to one of the drive units, and the rotation speed of the belt 194 is controlled by a control unit (not shown). The roller 194a is disposed between the roller 193a and the roller 193b over which the belt 193 is stretched in the y direction, and is disposed at substantially the same position as the rotation axis center of the nip roller 172. The roller 194b is located upstream of the roller 193b of the belt 193 in the y direction. The lower end in the z direction of the roller 193a spanned by the belt 193 and the lower end in the z direction of the roller 193b are positioned below the upper end in the z direction of the roller 194a and the upper end in the z direction of the roller 194b, respectively. To do. Accordingly, the belt 193 spanned between the rollers 193a and 193b and the belt 194 spanned between the rollers 194a and 194b are in contact with each other over a part of the region, and the pair of belt- like sheets 50 and 60 A surplus portion of the thread-like elastic body 7 located outward in the x direction of the composite sheet having the thread-like elastic body 7 fixed in an extended state is sandwiched between the belt 193 and the belt 194.

Next, a method for manufacturing an elastic sheet using the manufacturing apparatus 11E described above will be described. In the fifth embodiment, the description in detail regarding the first embodiment is applied as appropriate to points that are not particularly described.

First, as in the first embodiment, the thread-like elastic body 7 is continuously fed out, the fed-out thread-like elastic body 7 is introduced into the rotating arm 14 for winding the elastic body (supplying step), and then the rotating arm 14 Is used to continuously wind the thread-like elastic body 7 around the pair of transport belts 12 and 13 and transport the thread-like elastic body 7 by the pair of transport belts 12 and 13 (transport process). Next, in the fourth embodiment, the thread-like elastic body 7 is fixed in the extended state between the pair of belt- like sheets 50 and 60, and at the same time, the extending portion of the thread-like elastic body 7 is cut while maintaining the extended state. (Cutting process). More specifically, a continuous body in which the continuously wound thread-like elastic body 7 is disposed between the pair of belt- like sheets 50 and 60 is supplied between the pair of nip rollers 171 and 172, and the pair of belt-like sheets 50. , 60 is fixed in a stretched state. In the manufacturing apparatus 11E, as shown in FIG. 14, the portion of the thread-like elastic member 7 extended in the x direction by the nip roller 171 having the cutter blade 176 and the nip roller 172, that is, between the pair of belt- like sheets 50, 60. A thread-like elastic body 7 that is not fixed to the thread-like elastic body 7 is cut while the remaining portion of the thread-like elastic body 7 is maintained in an expanded state. In the manufacturing apparatus 11E, as shown in FIGS. 13 and 14, the portion of the thread-like elastic body 7 extended in the x direction is pressed between the belt 193 and the belt 194 from above and below, and the cutter blade The thread-like elastic body 7 can be cut at 176, the unnecessary portions of both ends of the thread-like elastic body 7 are shortly aligned, and the appearance of the produced stretchable sheet is improved. Moreover, since the unnecessary part of the thread-like elastic body 7 cut by the cutter blade 176 can be conveyed to the suction parts 195 and 195 by the belt 193 and the belt 194, the manufacturing apparatus 11E is hardly soiled.

Thereafter, in the fifth embodiment, the same process as in the first embodiment is performed to fix the thread-like elastic body 7 between the pair of belt- like sheets 50 and 60 so as to extend in a direction intersecting the y direction. The elastic sheet can be produced continuously.

Next, another preferred embodiment of the method for producing a stretchable sheet of the present invention will be described with reference to FIGS. In the sixth and seventh embodiments of the elastic sheet manufacturing method of the present invention, the thread-like elastic body 7 is stretched between the pair of belt- like sheets 50 and 60 in the direction x intersecting the conveying direction of the belt-like sheet. It is the manufacturing method of the elastic sheet which manufactures the fixed elastic sheet 3 continuously. In the sixth and seventh embodiments of the method for producing an elastic sheet of the present invention, the elastic elastic body winding means 14 is used to connect the thread-like elastic body 7 to a pair of conveying belts 12, 13 (long structure for conveying yarn). ), And the wound elastic body 7 is conveyed in the longitudinal direction by the pair of conveying belts 12 and 13 (longitudinal structure for yarn conveyance), and then between the belt- like sheets 50 and 60. A fixing step (integration step in the present invention) that is sandwiched between the two, and after the fixing step, the portions of the thread-like elastic body 7 that extend from both edges in the width direction of the belt- like sheets 50 and 60 are cut to form the thread-like elasticity. A first cutting step of releasing the winding state of the body around the pair of transport belts 12 and 13 (long structure for yarn transport), and after the first cutting step, the belt- like sheets 50 and 60 of the thread-like elastic body 7 Part 2 extending from both edges in the width direction A second cutting step of removing by cutting all or part of the 2.
The stretchable sheet produced in the sixth and seventh embodiments is used, for example, in the waist panel 3 of the unfolded disposable diaper 1 ′ as shown in FIG. The unfolded disposable diaper 1 ′ shown in FIG. 15 (hereinafter also referred to as “diaper 1 ′”) is different from the diaper 1 shown in FIG. 1 except that the length of the thread-like elastic body 7 in the waist panel 3 is slightly different. It has the same configuration. About the diaper 1 ', the point which is not demonstrated especially is the same as that of the diaper 1, and the description mentioned above about the diaper 1 is applied similarly.

Next, a preferred sixth embodiment of the method for producing a stretchable sheet of the present invention will be described with reference to the drawings, taking as an example the case of producing the above-described diaper 1 ′ waist panel 3 (stretchable sheet).
FIG. 16 schematically shows a stretchable sheet manufacturing apparatus 11 suitably used in the method of manufacturing the waist panel 3 (stretchable sheet) of the sixth embodiment. FIG. 17 schematically shows an example of a cutting means for performing the second cutting step on the stretchable sheet 3A manufactured by the manufacturing apparatus 11 shown in FIG.

A manufacturing apparatus 11 shown in FIG. 16 is an apparatus that continuously manufactures the elastic sheet 3A used for the waist panel 3, and is a pair separated in a direction (x direction) orthogonal to the sheet conveyance direction (y direction). The conveyor belts 12 and 13 are provided with a rotating arm (elastic body winding means) 14 for winding an elastic body for continuously winding the thread-like elastic body 7. Further, as shown in FIGS. 16 and 17, the manufacturing apparatus 11 continuously feeds the thread-like elastic body 7 and introduces the thread-like elastic body 7 into the rotating arm 14 in an expanded state, A conveying means 16 that conveys the thread-like elastic body 7 between the pair of belt- like sheets 50 and 60 by the pair of conveyor belts 12 and 13 and a pair of nip rollers 171 and 172 between the pair of belt- like sheets 50 and 60. This embodiment includes an integration means 17 for fixing the elongated thread-like elastic body 7 and a cutting means 218 for cutting the thread-like elastic body 7 extending from both ends of the belt- like sheets 50 and 60 in the width direction. The pair of conveyor belts 12 and 13 is a longitudinal structure for yarn conveyance, and the longitudinal direction of the longitudinal structure for yarn conveyance is the extending direction (y direction) of both the conveyor belts 12 and 13.

In the manufacturing apparatus 11 used in the sixth embodiment, a pair of conveyor belts 12 and 13, a rotating arm (elastic body winding means) 14 for elastic body winding, an elastic body supply means 15, a conveyance means 16, and an integration means 17. The pair of belt- like sheets 50 and 60 have the same configuration as that used in the manufacturing apparatus 11A described above, and the above description of the manufacturing apparatus 11A is applied as appropriate. In FIGS. 16 to 18, the same parts as those in FIGS. 2 to 6 are denoted by the same reference numerals.

As shown in FIG. 16, the cutting means 218 in the manufacturing apparatus 11 includes a cutter 280 in which a portion to which the conveyed elastic thread 7 hits is a sharp cutting blade (the cutter 280 on the conveying belt 13 side is (Not shown). The cutter 280 is disposed by a support (not shown) at a position where the thread-like elastic body 7 hits, and the thread-like elastic body 7 is cut by being conveyed by the conveying belts 12 and 13 and being pressed against the cutter 280. . In the y direction, the cutting means 218 includes a pair of nip rollers 171 and 172, pulleys 121 and 124 of the conveyor belt 12 (upper conveyor belt 12a and lower conveyor belt 12b), and conveyor belt 13 (upper conveyor belt 13a and lower conveyor). It is located between the pulleys 131 and 134 of the belt 13b). The position in the x direction where the thread-like elastic body 7 is cut by the cutting means 218 may be between the nip rollers 171 and 172 and the conveyor belts 12 and 13, or the inner and outer circumferences of the conveyor belts 12 and 13, respectively. May be between the outer peripheral portions of the conveyor belts 12 and 13. Further, as the cutting means 218, various known devices that can cut the thread-like elastic body 7 can be used without particular limitation. For example, a cutter roller having a cutting blade extending in the circumferential direction on the outer peripheral surface and the cutting blade It is also possible to use a roller cutter or the like equipped with an anvil roller for receiving the same. Moreover, you may cut | disconnect with a laser, a heat | fever, etc.

The second cutting means 219 shown in FIG. 17 is arranged downstream of the manufacturing apparatus 11 shown in FIG. 16, and performs the second cutting process on the stretchable sheet 3A manufactured by the manufacturing apparatus 11. In the first cutting step, as shown in FIG. 16, the thread-like elastic body 7 that is stretched between the pair of conveying belts 12 and 13 is stretched from both edges in the width direction of the belt- like sheets 50 and 60. The second cutting step is a step of cutting at the extending portion, and the step performed by the cutting means 218 described above, whereas the second cutting step is a stretch property generated by releasing the stretched state by the first cutting step. This is a step of removing all or part of the portions 272 and 272 extending from both edges in the width direction of the belt- like sheets 50 and 60 in the sheet 3A, and is performed by the second cutting means 219. The portion 272 to be removed in the second cutting step is usually cut in a contracted state, but may be cut in a stretched state.

The second cutting means 219 includes a score cutter roller 293 and an anvil roller 294 as shown in FIG. The upstream and downstream sides of the score cutter roller 293 and the anvil roller 294 are provided with conveying means (not shown) such as a conveying roller and a belt conveyor, and the elastic sheet 3A manufactured by the manufacturing apparatus of FIG. It is conveyed by the conveying means and introduced between the score cutter roller 293 and the anvil roller 294.

As shown in FIG. 17, the score cutter roller 293 includes two cutter blades 295 and 295 that are spaced apart in the axial length direction. The cutter blades 295 are respectively formed over the entire circumference of the score cutter roller 293, and the interval between the two cutter blades 295 and 295 is the sheet portion (the belt-like sheets 50 and 60) of the stretchable sheet 3A that has been conveyed. ) Is slightly wider than the width of.
As shown in FIG. 17, the anvil roller 294 has a cylindrical outer peripheral surface extending between the two cutter blades 295 and 295 of the score cutter roller 293.

In the vicinity of the second cutting means 219, as shown in FIG. 17, both ends in the width direction of the pair of belt- like sheets 50, 60 cut by the pair of score cutter rollers 293 and the anvil roller 294 which are the second cutting means 219 Are provided with suction portions 296 and 296 for sucking an unnecessary portion 272 of the thread-like elastic body 7 that has been extended. The suction part 296 is disposed so that the cutter blade 295 is close to a portion where the cutter blade 295 contacts the peripheral surface of the anvil roller 294.

Next, a method for producing a stretchable sheet using the above-described production apparatus 11 will be described.

First, as shown in FIG. 3, the thread-like elastic body 7 is continuously fed out, and the fed-out thread-like elastic body 7 is introduced into a rotating arm 14 as an elastic body winding means in an expanded state.
More specifically, the thread-like elastic body 7 is continuously fed out from the bobbin 70 around which the thread-like elastic body 7 is wound using the feeding roller 152. In this embodiment, the bobbin 70 does not rotate, but may rotate. When unwinding, the rotational speed of the unwinding roller 152 and the brake of the tensor 151 are adjusted by a control unit (not shown) of the manufacturing apparatus 11 based on the tension detection output of the thread-like elastic body 7 by the tension measuring device 153. The thread-like elastic body 7 is fed out from the bobbin 70 with a predetermined tension.

In this embodiment, the thread-like elastic body 7 is introduced into the rotating arm 14. When the thread-like elastic body 7 is introduced, it is introduced into the rotating arm 14 (elastic body winding means) by the feed roller 156 described above. The speed of the thread-like elastic body 7 is adjusted to a constant speed and introduced. The introduction speed is a speed corresponding to the winding speed for winding the pair of conveyor belts 12 and 13.

Then, as shown in FIGS. 16 and 3, the thread-like elastic body 7 in an extended state is continuously wound around the pair of transport belts 12 and 13 using the rotating arm 14, and the pair of transport belts 12 and 13 is used. The thread-like elastic body 7 wound continuously is conveyed between the pair of belt- like sheets 50 and 60. More specifically, the thread-like elastic body 7 supplied to the rotating arm 14 in the extended state is introduced into the arm portion 141 from the introduction port 145, and guided through the shaft portion 142, the connecting portion 144, and the rotating portion 143. Derived from outlet 146. The thread-like elastic body 7 led out from the lead-out port 146 is led out while the rotary arm 14 is rotated, so that the outer peripheral side at the upstream end of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and The conveyor belt 13 (upper conveyor belt 13a, lower conveyor belt 13b) is wound around the outer peripheral side at the upstream end. Here, the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b) and the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b) are rotated by the rotational travel of the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b). ) And the outer periphery of the conveyor belt 13 (upper conveyor belt 13a, lower conveyor belt 13b), the thread-like elastic body 7 is continuously wound in a spiral shape. The continuously wound thread-like elastic body 7 is conveyed between the pair of downstream belt- like sheets 50 and 60.

Here, the thread-like elastic body 7 wound around the pair of transport belts 12 and 13 extends in a direction intersecting the y direction, and is not arranged in a direction orthogonal to the y direction. In order to correct the wound thread-like elastic body 7 in a direction orthogonal to the y-direction (x-direction), for example, when the thread-like elastic body 7 is wound as shown in FIG. 12, the rotational speed of the upper transport belt 12 a is made slower than the rotational speed of the lower transport belt 12 b, and the rotational speed of the lower transport belt 13 b is made slower than the rotational speed of the upper transport belt 13 a in the transport belt 13. Thus, the inclination of the thread-like elastic body 7 is gradually changed during the conveyance in the y-direction, and the inclination of the thread-like elastic body 7 is orthogonal to the y-direction before being conveyed between the pair of belt-like sheets 50 and 60 ( x direction).

As shown in FIG. 16, the belt-like sheet 50 is preliminarily non-opposed by a sailor (not shown) or the like on both sides in the longitudinal direction (both ends in the x direction) on the outer surface side (surface not joined to the belt-like sheet 60). A pair of nip rollers 171 and 172 from the upper side of the conveyor belt 12 (upper conveyor belt 12a and lower conveyor belt 12b) and conveyor belt 13 (upper conveyor belt 13a and lower conveyor belt 13b). Supplied in between. Further, as shown in FIG. 16, the belt-like sheet 60 is preliminarily formed by a sailor (not shown) or the like on both sides in the longitudinal direction (both ends in the x direction) on the outer surface side (non-opposing surfaces that do not face the belt-like sheet 50). Between the pair of nip rollers 171 and 172 from the lower side of the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b) and conveyor belt 13 (upper conveyor belt 13a, lower conveyor belt 13b). Has been supplied to. In addition, before the strip | belt-shaped sheet 50 and / or the strip | belt-shaped sheet 60 are supplied between a pair of nip rollers 171,172, the adhesive agent is apply | coated to the inner surface side. The adhesive may be applied on the entire surface in a spiral shape or in a solid shape.

Next, the thread-like elastic body 7 is fixed in a stretched state between the pair of belt- like sheets 50 and 60 using the nip rollers 171 and 172. More specifically, a continuous body in which the continuously wound thread-like elastic body 7 is disposed between the pair of belt- like sheets 50 and 60 is supplied between the pair of nip rollers 171 and 172, and the pair of belt-like sheets 50. , 60 is fixed in a stretched state. As described above, the thread-like elastic body 7 is wound around the pair of transport belts 12 and 13 separated in the direction (x direction) perpendicular to the transport direction of the sheets 50 and 60, and the wound thread-like elastic body 7 is wound. In this way, the process until the thread-like elastic body 7 is fixed between the belt- like sheets 50 and 60 by using the nip rollers 171 and 172 after being conveyed by the pair of conveying belts 12 and 13 is carried out. It is a fixing process (integration process) in the embodiment.

Next, the thread-like elastic body 7 extending from both ends in the width direction (x direction) of the pair of belt- like sheets 50 and 60 is cut by the cutter 180 described above (first cutting step). In the first cutting step, the thread-like elastic body 7 that is stretched between the pair of conveyor belts 12 and 13 is cut, and by this cutting, the thread-like elastic body with respect to the pair of conveyor belts 12 and 13 is cut. The wound state is released, and the elastic sheet 3 </ b> A in which the thread-like elastic body 7 extends from each of both end edges in the width direction of the belt- like sheets 50 and 60 is obtained. The portions extending from both edges in the width direction of the belt- like sheets 50 and 60 in the stretchable sheet 3A are in a contracted state (natural state).
In the present embodiment, the belt- like sheets 50 and 60 are folded back on both sides in the longitudinal direction, and both end edges in the width direction of the belt-like sheet are edges in the folded state.

Next, the stretchable sheet 3A is conveyed to the second cutting means 219, and the second cutting means 219 extends the both ends of the elastic sheet 7A in the stretchable sheet 3A from both edges in the width direction of the belt- like sheets 50 and 60. All or part of the contracted portions 272 and 272 to be removed is removed by cutting.
In the second cutting step in the present embodiment, as shown in FIG. 17, portions of the elastic sheet 3 </ b> A that extend from both edges in the width direction of the belt- like sheets 50, 60 for any thread-like elastic body 7 in the y direction. Only cut off. More specifically, as shown in FIG. 17, a thread-like elastic body positioned outward from both outer ends in the x direction of the belt- like sheets 50 and 60 by a score cutter roller 293 having an cutter blade 295 and an anvil roller 294. 7, that is, the thread-like elastic body 7 that is not fixed between the pair of belt- like sheets 50 and 60, and the remaining part of the thread-like elastic body 7 is cut.

This cutting is performed in a state where, in addition to the thread-like elastic body 7, the sheet portions (band-like sheets 50, 60) in the stretchable sheet 3 A are contracted in the width direction by the thread-like elastic body 7. However, even if the belt- like sheets 50 and 60 are conveyed to the second cutting means while maintaining the stretched state, and the contracted portions 272 extending from both ends in the width direction of the belt- like sheets 50 and 60 are cut in that state. good.
By cutting the contracted portions 272 extending from both ends of the belt- like sheets 50, 60 in the width direction by this second cutting step, unnecessary portions at both ends of the thread-like elastic body 7 can be shortened and cut and removed. The appearance of the produced elastic sheet is improved. Further, by providing the suction portions 296, 296, inconvenience due to the cut pieces generated by cutting the thread-like elastic body 7 entering the elastic sheet 3 to be manufactured or adhering to the rollers 293, 294, etc. is prevented. be able to.

In the second cutting step, the length L1 of the portion of the elastic sheet 7A of the stretchable sheet 3A after the fixing step that extends from both edges in the width direction of the belt-like sheet is 0 to 5 mm, particularly 0 to 3 mm. It is preferable from the viewpoint of preventing the appearance of the elastic sheet 3 from being deteriorated by the extended portion. The thread-like elastic body 7 may be cut at substantially the same position as both ends in the width direction of the belt- like sheets 50 and 60, and the portions extending from the both ends of the thread-like elastic body 7 may be completely eliminated.

Subsequently, the width direction both ends (both ends in the x direction) of each of the belt- like sheets 50 and 60 folded on the outer surface side are expanded outward in the width direction by a sailor (not shown), and the expanded portions are They are joined by a known joining means such as an adhesive or fusion.
Thereby, the band-shaped elastic sheet which fixed the thread-like elastic body 7 in the direction which cross | intersected the y direction between a pair of band-shaped sheets 50 and 60 can be manufactured continuously.
Further, the manufactured belt-like stretchable sheet is intermittently cut in the x direction by a known cutting means (not shown). The interval of intermittent cutting is the same as the size of the waist panel 3 provided in the diaper 1 ′. Thereby, the waist panel 3 (elastic sheet) can be manufactured continuously.

According to the sixth embodiment, after the first cutting step of releasing the winding state of the thread-like elastic body 7 around the pair of transport belts 12 and 13, the width direction of the belt-like sheet in the thread-like elastic body 7 is a separate process. Since all or part of the contracted portions 272 and 272 extending from both end edges are cut, unstable portions of the thread-like elastic body extending from both end edges in the width direction of the belt- like sheets 50 and 60 are efficiently removed. Thus, the elastic sheet 3 having a good appearance can be efficiently produced.

In order to completely cut off the portions extending from both edges in the width direction of the belt-like sheet when cutting to release the wound state of the thread-like elastic body 7 around the pair of conveying belts 12 and 13, Even after the thread-like elastic body of the book is cut, cutting must be performed while maintaining the next thread-like elastic body so as not to contract, and the configuration of the cutting means becomes complicated. On the other hand, as in the present embodiment, the cutting of the thread-like elastic body for releasing the winding state with respect to the pair of transport belts 12 and 13 and the cutting for cutting the unnecessary portions so as to be short are separated. By performing the above, it is possible to efficiently manufacture a stretchable sheet having a good appearance from which unnecessary portions are removed while preventing the stretchable sheet manufacturing apparatus from becoming complicated.

Further, in the sixth embodiment, the above-described fixing is performed using the belt- like sheets 50 and 60 in which both ends in the width direction (both ends in the x direction) are folded back to the outer surface side (non-opposing surface side). After performing the step, the first cutting step and the second cutting step, by expanding the folded portions of the belt- like sheets 50, 60, and joining the expanded portions 50A, 60A of the pair of belt-like sheets, As shown in FIG. 17, the elastic sheet 3 is obtained in which the thread-like elastic body 7 does not extend from both ends of the belt-like sheet. Therefore, in the second cutting step, in the stretchable sheet 3 finally obtained even if the contracted portion 272 of the thread-like elastic body 7 is cut so that the portions extending from both edges in the width direction of the belt-like sheet remain slightly. The extension part becomes almost unnoticeable.

As a manufacturing method of the diaper 1 ′ including the waist panel 3, the conveyance direction (y direction) is performed between the continuous body of the top sheet 21, the continuous body of the back sheet 22, and the continuous body of both sheets 21 and 22 by a known method. ) Are intermittently provided with a plurality of absorbers 23, 23... And formed into a plurality of elastic members 25 and three-dimensional guards extending on both sides in the conveying direction (y direction) of the continuous body of the topsheet 21. A continuous body of the absorbent main body 2 provided with a continuous body of the sheet 24 is manufactured in a separate process.
A pair of waist panels 3 are included in the continuous body of the absorbent main body 2 so as to protrude outward in the x direction while transporting the manufactured continuous body of the absorbent main body 2 in the transport direction (y direction). A continuous body of diapers 1 ′ arranged for each absorber 23 is manufactured. By forming the waist panel 3 from the elastic sheet manufactured as described above, it is easy to prevent the thread-like elastic body 7 from being present at the joint portion with the absorbent main body 2, and the sealing property is good. There are also benefits. Here, the conveyance direction (y direction) of the continuous body of the absorbent main body 2 and the conveyance direction (y direction) when manufacturing the waist panel 3 (elastic sheet) are the same direction, and the waist panel 3 (extension and contraction). It is not necessary to invert the adhesive sheet) by 90 °. Thereafter, the continuum can be cut into the dimensions of individual diapers 1 ′ by a known cutting means (not shown) to produce diapers 1 ′.

Next, a seventh embodiment of the present invention will be described. In the seventh embodiment, points different from the sixth embodiment described above will be mainly described, and the same points will be denoted by the same reference numerals and description thereof will be omitted. Points that are not particularly described can be the same as those in the above-described embodiment.

In the seventh embodiment, as shown in FIG. 18, a shear cutter 219 </ b> A having two sliding blades in which one or both of them moves is used as the second cutting means. The shear cutters 219A are arranged on both sides of the stretchable sheet 3A. Like the clippers, the shear cutters 219A sandwich the thread-like elastic body 7 between two blades and apply a shearing force to the thread-like elastic body 7. Disconnect. In the seventh embodiment, the same effect as in the sixth embodiment can be obtained.

The production method of the stretchable sheet of the present invention is not limited to the production methods of the first, second, third, fourth, fifth, sixth and seventh embodiments described above, and can be changed as appropriate. It is.

For example, in the manufacturing apparatuses 11A, 11B, and 11D used in the manufacturing methods of the first, second, and fourth embodiments, a pressing belt 191 is provided as a means for pressing from the vertical direction, and the manufacturing of the third and fifth embodiments is performed. In the manufacturing apparatuses 11C and 11E used in the method, a pair of upper and lower belts 193 and 194 are provided as means for pressing in the vertical direction, but instead of them, means for pressing together with the conveyor belts 12 and 13 may be provided. Good.

As means for pressing together with the conveyor belts 12 and 13, there are rollers that rotate while contacting the conveyor belts 12 and 13 on the outer peripheral sides of the conveyor belts 12 and 13. Since the rollers disposed on the outer peripheral sides of the conveyor belts 12 and 13 are formed symmetrically, one roller will be described in the following description.

Specifically, in the manufacturing apparatus 11F suitably used in the manufacturing method of the eighth embodiment shown in FIG. 19, rollers 112a and 112b that rotate by the rotation of the upper conveyance belt 12a are provided on the outer peripheral side of the upper conveyance belt 12a. In addition, rollers 122a and 122b that rotate by the rotation of the lower conveyance belt 12b are provided on the outer peripheral side of the lower conveyance belt 12b. Each of the rollers 112a, 112b, 122a, 122b has a rotation axis direction arranged in the z direction. The roller 112a on the upper conveyance belt 12a side is upstream of the rotation axis center of the score cutter roller 183 of the manufacturing apparatuses 11A, 11B, and 11C or the rotation axis center of the nip roller 171 of the manufacturing apparatuses 11D and 11E in the y direction. The roller 112b is arranged upstream of the roller 112a in the y direction. The roller 122a on the lower conveyance belt 12b side is substantially the same position in the y direction as the rotation axis center of the score cutter roller 183 of the manufacturing apparatuses 11A, 11B, and 11C or the rotation axis center of the nip roller 171 of the manufacturing apparatuses 11D and 11E. The roller 122b is disposed at a position between the rollers 112a and 112b on the upper conveyance belt 12a side in the y direction.

In the manufacturing apparatus 11F, as shown in FIG. 19, two rollers 112a and 112b are arranged on the upper conveyance belt 12a. However, only one of them may be provided, and more than two rollers may be provided. It may be in a form provided. Similarly, although the two rollers 122a and 122b are arranged on the lower conveyance belt 12b, a mode in which only one roller is provided or a mode in which more than two rollers are provided may be employed.

According to the manufacturing method of the eighth embodiment using the manufacturing apparatus 11 </ b> F, in the cutting process, while maintaining the extended state using the means for pressing the extending elastic part together with the conveyor belts 12 and 13. Can be cut. Specifically, the thread-like elastic body 7 wound around the outer periphery of the lower transport belt 12b while holding the thread-like elastic body 7 wound around the outer periphery of the upper transport belt 12a with two rollers 112a and 112b. Is held by the two rollers 122a and 122b, and the remainder of the thread-like elastic body 7 is supplied between the pair of score cutter rollers 183 and anvil rollers 184 in the manufacturing apparatuses 11A, 11B, and 11C. In 11D and 11E, it can be supplied between the nip rollers 171 and 172, and can be cut while maintaining the extended state.

Further, as means for pressing together with the conveyor belts 12 and 13, belts that rotate while contacting the conveyor belts 12 and 13 on the outer peripheral sides of the conveyor belts 12 and 13 can be cited. Since the belts arranged on the outer peripheral sides of the conveyor belts 12 and 13 are symmetrically formed, one belt will be described in the following description.

Specifically, in the manufacturing apparatus 11G suitably used in the manufacturing method of the ninth embodiment shown in FIG. 20, the belt 114 that rotates by the rotation of the upper conveyance belt 12a is provided on the outer peripheral side of the upper conveyance belt 12a, and the lower A belt 115 that is rotated by the rotation of the lower conveyance belt 12b is provided on the outer peripheral side of the conveyance belt 12b. The belt 114 is stretched between rollers 114a and 114b whose rotation axis direction is arranged in the z direction. The roller 114a on the upper conveyance belt 12a side is upstream of the rotation axis center of the score cutter roller 183 of the manufacturing apparatuses 11A, 11B, and 11C or the rotation axis center of the nip roller 171 of the manufacturing apparatuses 11D and 11E in the y direction. The roller 114b is arranged upstream of the roller 114a in the y direction. The roller 115a on the lower conveyance belt 12b side is arranged at substantially the same position in the y direction as the rotation axis center of the score cutter roller 183 of the manufacturing apparatuses 11A, 11B, and 11C or the rotation axis center of the nip roller 171 of the manufacturing apparatuses 11D and 11E. The roller 115b is arranged at a position between the rollers 114a and 114b on the upper conveyance belt 12a side in the y direction. Accordingly, the belt 115 disposed on the lower conveyance belt 12b side is disposed slightly downstream in the y direction compared to the belt 114 disposed on the upper conveyance belt 12a side. The bearing portions of the rollers 114a and 114b that bridge the belt 114 are provided with force such as hydraulic pressure, pneumatic pressure, and spring from the viewpoint of securely holding the thread-like elastic body 7 wound around the outer periphery of the upper conveyance belt 12a by the belt 114. Each bearing part is pressurized by using. The same applies to the bearing portions of the rollers 115a and 115b that bridge the belt 115.

According to the manufacturing method of the ninth embodiment using the manufacturing apparatus 11G, in the cutting step, the extension of the thread-like elastic body is held together with the conveyor belts 12 and 13 while maintaining the extended state. Can be cut. Specifically, the thread-like elastic body 7 wound around the outer periphery of the lower transport belt 12b is held by the belt 115 while the thread-like elastic body 7 wound around the outer periphery of the upper transport belt 12a is held by the belt 114. On the other hand, the surplus portion of the thread-like elastic body 7 is supplied between the pair of score cutter rollers 183 and the anvil roller 184 in the manufacturing apparatuses 11A, 11B, and 11C, and the nip rollers 171 and 172 in the manufacturing apparatuses 11D and 11E. Can be cut while being kept in an extended state.

In the manufacturing method of the first, second, third, fourth, fifth, eighth, and ninth embodiments described above, both ends in the width direction are disposed between the pair of nip rollers 171 and 172 on the outer surfaces. A belt-like sheet which is folded back to a narrow width is introduced, and a thread-like elastic body is fixed between the belt-like sheets, but a belt-like sheet whose both ends in the width direction are not folded between the pair of nip rollers 171 and 172. It may be introduced and a thread-like elastic body may be fixed between the belt-like sheets.

As the belt-like sheet according to the sixth or seventh embodiment, a sheet in which both sides in the longitudinal direction (both ends in the width direction of the sheet) are not folded may be used. In that case, the width direction both edges of a strip | belt-shaped sheet | seat are the same as the width direction both edges of an elastic sheet. In the case of folding, only the widthwise end of one sheet may be used, or only the end of one belt-like sheet may be used. Further, the inclination of the thread-like elastic body 7 is corrected in the direction orthogonal to the y-direction (x-direction), but is fixed to the pair of belt- like sheets 50 and 60 without being corrected at the angle wound around the conveyor belt 12. May be.

The elastic body winding means includes a disk having a thread-like elastic body introducing portion at the rotating shaft portion and an arm protruding downstream from the disk in the y direction. It is also possible to use one that wraps around the belt and winds the elastic thread around the conveyor belts 12 and 13. Moreover, the thing of patent document 1 and 2 etc. can also be used.

Further, as the conveyor belt, a conveyor belt as disclosed in WO2005 / 060910 may be used instead of a pair of conveyor belts. In this case, only one conveyor belt may be used. Further, a thread support member provided with screw grooves described in FIGS. 4 to 6 of JP-A No. 2002-192641 may be used as the longitudinal structure for thread conveyance.

Also, as a cutting means in the second cutting step such as the second and seventh embodiments, other forms of score cutters and shear cutters can be used, and fixed blades and rotary blades can also be used. Moreover, the cutting means similar to a 2nd cutting process can also be used as a cutting means of a 1st cutting process.

The stretchable sheet manufactured by the manufacturing method of the present invention, for example, the stretchable sheet manufactured by the manufacturing method of the first to ninth embodiments, is a deployable or pant-type disposable in addition to the waist panel of the deployable disposable diaper. It can also be used for diaper trunks, pants-type sanitary napkins, disposable underwear, disposable mask ear hooks, cleaning sheets, bandages and the like.
Moreover, the waist panel 3 consists of the adhesion part formed by the fastening means which consists of the engaging part formed by fixing the male member of a hook-and-loop fastener to the single side | surface of an elastic sheet, and the adhesive part formed by apply | coating an adhesive. It may have a fastening means. These fastening means are used by being fixed to, for example, the outer surface of the absorbent main body 2 on the ventral side A side or the panel material 4 when the diaper is worn.

In addition, the description omitted in one embodiment and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately applied between the embodiments. Can be substituted for each other.

Regarding the above-described embodiment, the present invention further discloses the following manufacturing method or manufacturing method of the absorbent article.

<1> A method for producing a stretchable sheet, which continuously produces a stretchable sheet that is fixed in a state where a thread-like elastic body is stretched in a direction intersecting the transport direction of the beltlike sheet between a pair of striplike sheets, A feeding step of continuously feeding out the thread-like elastic body and introducing the fed-out thread-like elastic body into an elastic body winding means; and using the elastic body winding means, the thread-like elastic body as a sheet conveying direction. Continuously winding around a pair of conveying belts separated in a direction orthogonal to each other, a conveying step of conveying the filamentous elastic body by the pair of conveyor belts, and fixing the conveyed filamentous elastic body between the belt-like sheets A method for producing a stretchable sheet, comprising: an integration step; and a cutting step of cutting a portion of the thread-like elastic body extending from each of both ends in the width direction of the pair of belt-like sheets.

<2> In the cutting step, the extending portion of the thread-like elastic body is cut while maintaining an extended state, and the extending portion of the thread-like elastic body is removed. Manufacturing method of the elastic sheet.
<3> In the integration step, the thread-like elastic body is affixed between the belt-like sheets in a state in which the thread-like elastic body is wound around the pair of transport belts. The elastic sheet according to <2>, wherein the thread-like elastic body is cut in a state where the thread-like elastic body is wound around the pair of transport belts using a cutting unit disposed on an inner portion of the belt. Production method.
<4> In the integration step, the thread-like elastic body is fixed in an extended state between the pair of belt-like sheets using a nip roller, and then the portion of the thread-like elastic body that is extended in the cutting step The method for producing a stretchable sheet according to <2> or <3>, wherein the elastic sheet is cut while maintaining a stretched state.
<5> In the integration step, the thread-like elastic body is fixed in a stretched state between the pair of belt-like sheets, and at the same time, in the cutting step, the extending portion of the thread-like elastic body is held in the stretched state. The manufacturing method of the elastic sheet as described in said <2> or <3> cut | disconnecting.
<6> In the cutting step, using the means for pressing the extended elastic body from above and / or downward, the portion is cut while maintaining the stretched state. 5> The manufacturing method of the elastic sheet in any one of.
<7> In any one of the above items <2> to <5>, in the cutting step, the thread-like elastic body that is extended is cut while being held in an extended state using a means that holds the elastic body together with the conveyor belt. The manufacturing method of the elastic sheet of description.
<8> As the pair of band-shaped sheets, after performing the integration step and the cutting step described above using the band-shaped sheets that are folded back to the outer surface side in the width direction, The method for producing a stretchable sheet according to any one of <2> to <7>, wherein the folded portion is expanded.
<9> As the cutting step, after the integration step, a portion of the thread-like elastic body extending from both edges in the width direction of the belt-like sheet is cut, and the thread-like elastic body with respect to the yarn transporting longitudinal structure A first cutting step for releasing the wound state is provided, and the whole or a part of the portion extending from both ends in the width direction of the belt-like sheet in the thread-like elastic body is removed by cutting, which is performed after the first cutting step. The manufacturing method of the elastic sheet as described in said <1> which comprises the 2nd cutting process to perform.
<10> The method for producing a stretchable sheet according to <9>, wherein in the second cutting step, only the portions of the thread-like elastic body that extend from both edges in the width direction of the belt-like sheet are cut.
<11> The stretchability according to <10>, wherein in the second cutting step, the thread-like elastic body is cut so that a length of a portion extending from both edges in the width direction of the belt-like sheet is 5 mm or less. Sheet manufacturing method.
<12> In the second cutting step, the inner part of the belt-like sheet is cut from both ends in the width direction, and the contracted portion of the thread-like elastic body is removed together with a part of the belt-like sheet, <9> The manufacturing method of the elastic sheet of description.
<13> The stretchable position according to <12>, wherein the position where the belt-like sheet is cut is a position where the distance from each edge in the width direction of the belt-like sheet is 0 to 20% of the entire width of the belt-like sheet. Manufacturing method of adhesive sheet.
<14> The above-described integration process, first cutting process, and second cutting process were performed using a band-shaped sheet that was formed by folding back both ends in the width direction to the outer surface side as a pair of the band-shaped sheets. Then, the stretched sheet manufacturing method according to any one of <9> to <13>, wherein the folded portions of each of the band-shaped sheets are expanded and the expanded portions of the pair of band-shaped sheets are joined to each other.

<15> In the cutting step, the portions extending from both ends in the width direction of the pair of belt-like sheets are cut so that the lengths of the thread-like elastic bodies included in the elastic sheet to be manufactured are uniform. The method for producing an elastic sheet according to any one of <1> to <14>.
<16> The stretchability according to <6> or <7>, in which an unnecessary portion of the cut thread-like elastic body is transported to a suction portion by using a means for pressing the part of the extending thread-like elastic body. Sheet manufacturing method.

<17> A method for producing a disposable diaper having a top sheet, a back sheet, an absorbent main body having an absorbent body disposed between both sheets, and a waist panel made of a stretch sheet, wherein the stretch sheet is A method for producing a disposable diaper, comprising a step of producing the elastic sheet according to any one of <1> to <16>.
<18> A method for producing a disposable diaper using the elastic sheet obtained by the method for producing an elastic sheet according to any one of <1> to <16> as a waist panel, wherein the disposable diaper is , A top sheet, a back sheet and an absorbent main body having an absorbent body disposed between both sheets, a top sheet continuous body, a back sheet continuous body, and a continuous body between both sheets, A process for producing a continuous body of absorbent main body having a plurality of absorbent bodies intermittently arranged in the transport direction, and the continuous body of the absorbent main body intersects the transport direction while transporting the continuous body in the transport direction. A step of arranging a pair of the waist panels so as to protrude outward in both directions for each absorbent body included in the continuous body of the absorbent main body, and a continuous body of the absorbent main body in which the waist panel is disposed, Size of diaper And a step of cutting, the method of manufacturing a disposable diaper.

According to the method for producing a stretchable sheet of the present invention, unnecessary portions at both ends of the thread-like elastic body can be cut short and aligned to improve the appearance of the produced stretchable sheet.

According to the method for producing an elastic sheet of the present invention, an elastic sheet in which a thread-like elastic body is fixed between a pair of belt-like sheets in an extended state in a direction intersecting the conveying direction of the belt-like sheet is continuously produced. An elastic sheet that can efficiently produce an elastic sheet having a good appearance by efficiently removing an unstable portion of a thread-like elastic body extending from an edge in the width direction of the belt-like sheet. A manufacturing method is provided. Moreover, the manufacturing method of the elastic sheet of this invention can be implemented with a comparatively simple installation.

Claims (18)

1. A method for producing a stretchable sheet for continuously producing a stretchable sheet fixed in a state in which a thread-like elastic body is stretched in a direction intersecting the transport direction of the beltlike sheet between a pair of beltlike sheets,
   A feeding step of continuously feeding out the thread-like elastic body and introducing the fed-out thread-like elastic body into an elastic body winding means; and using the elastic body winding means, the thread-like elastic body as a sheet conveying direction. Continuously winding around a pair of conveying belts separated in a direction orthogonal to each other, a conveying step of conveying the filamentous elastic body by the pair of conveyor belts, and fixing the conveyed filamentous elastic body between the belt-like sheets A method for producing a stretchable sheet, comprising: an integration step; and a cutting step of cutting a portion of the thread-like elastic body extending from each of both ends in the width direction of the pair of belt-like sheets.
2. The elastic sheet according to claim 1, wherein, in the cutting step, the extended portion of the thread-like elastic body is cut while maintaining the stretched state, and the extending portion of the thread-like elastic body is removed. Method.
3. In the integration step, the thread-like elastic body is attached between the belt-like sheets in a state where the thread-like elastic body is wound around a pair of the transport belts,
   In the cutting step, the thread-like elastic body is cut in a state in which the thread-like elastic body is wound around the pair of transport belts by using a cutting unit disposed on an inner portion of the pair of transport belts. The manufacturing method of the elastic sheet of 2.
4. In the integration step, the thread-like elastic body is fixed in a stretched state between the pair of belt-like sheets using a nip roller, and then the portion of the thread-like elastic body that is extended is stretched in the cutting step. The manufacturing method of the elastic sheet of Claim 2 or 3 cut | disconnected while hold | maintaining.
5. In the integration step, the thread-like elastic body is fixed in a stretched state between the pair of belt-like sheets, and at the same time, in the cutting step, the portion of the thread-like elastic body that is extended is cut while maintaining the stretched state. The manufacturing method of the elastic sheet of Claim 2 or 3.
6. 6. The cutting process according to claim 2, wherein in the cutting step, the portion of the thread-like elastic body that is extended is cut while maintaining an extended state by using means for pressing from above and / or from below. The manufacturing method of the elastic sheet of description.
7. The elastic sheet according to any one of claims 2 to 5, wherein, in the cutting step, the thread-like elastic body that is extended is cut while maintaining an extended state by using a means that holds the elastic body together with the conveying belt. Production method.
8. As a pair of the belt-like sheets, after performing the integration step and the cutting step described above using the belt-like sheets that are narrowed by folding back both ends in the width direction to the respective outer surface sides, The method for producing a stretchable sheet according to any one of claims 2 to 7, wherein the stretchable sheet is expanded.
9. As the cutting step, after the integration step, a portion of the thread-like elastic body that extends from both edges in the width direction of the belt-like sheet is cut, and the wound state of the thread-like elastic body around the thread-conveying longitudinal structure A second cutting step that removes all or part of a portion of the thread-like elastic body extending from both edges in the width direction of the belt-like sheet, which is performed after the first cutting step. The manufacturing method of the elastic sheet of Claim 1 which comprises a cutting process.
10. The method for producing a stretchable sheet according to claim 9, wherein, in the second cutting step, only the portion of the thread-like elastic body that extends from both edges in the width direction of the belt-like sheet is cut.
11. The method for producing an elastic sheet according to claim 10, wherein, in the second cutting step, the thread-like elastic body is cut so that a length of a portion extending from both edges in the width direction of the belt-like sheet is 5 mm or less.
12. The elastic sheet according to claim 9, wherein, in the second cutting step, a portion inside the both ends in the width direction of the belt-like sheet is cut, and the contracted portion of the thread-like elastic body is removed together with a part of the belt-like sheet. Manufacturing method.
13. The method for producing an elastic sheet according to claim 12, wherein the position where the belt-like sheet is cut is a position where the distance from each of both end edges in the width direction of the belt-like sheet is 0 to 20% of the entire width of the belt-like sheet. .
14. As the pair of belt-like sheets, after performing the above-described integration step, first cutting step, and second cutting step using the belt-like sheets that are narrowed by folding back both ends in the width direction to the respective outer surface sides, The method for producing a stretchable sheet according to any one of claims 9 to 13, wherein the folded portions of each of the belt-shaped sheets are expanded and the expanded portions of the pair of belt-shaped sheets are joined to each other.
15. In the cutting step, the portions extending from both ends in the width direction of the pair of belt-like sheets are cut so that the lengths of the thread-like elastic bodies included in the elastic sheet to be manufactured are uniform. 15. The method for producing an elastic sheet according to any one of 1 to 14.
16. The method for producing a stretchable sheet according to claim 6 or 7, wherein an unnecessary portion of the cut thread-like elastic body is conveyed to a suction portion by means of pressing the part of the extending thread-like elastic body.
17. It is a manufacturing method of a disposable diaper having a topsheet, a backsheet and an absorbent main body having an absorber disposed between both sheets, and a waist panel made of a stretchable sheet,
    A method for producing a disposable diaper, comprising a step of producing the elastic sheet by the method for producing an elastic sheet according to any one of claims 1 to 16.
18. A method for producing a disposable diaper using the elastic sheet obtained by the method for producing an elastic sheet according to any one of claims 1 to 16 as a waist panel,
    The disposable diaper has an absorbent main body having a top sheet, a back sheet, and an absorber disposed between the two sheets,
    A step of producing a continuous body of an absorbent main body having a plurality of absorbent bodies arranged intermittently in the conveying direction between a continuous body of top sheets, a continuous body of back sheets, and a continuous body of both sheets;
    The absorbent body included in the continuum of the absorbent main body includes a pair of the waist panels so that the absorbent body continuum protrudes outward in the direction intersecting the transport direction while transporting the continuum of the absorbent main body. A process to be arranged every time,
    The manufacturing method of a disposable diaper which comprises the process of cut | disconnecting the continuous body of the absorptive main body by which the waist panel was distribute | arranged to the dimension of each diaper.

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