JP5089752B2 - Method for producing elastic sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic sheet manufacturing method capable of effectively manufacturing an elastic sheet with good appearance by effectively eliminating unstable parts of thread-like elastic bodies extending out from the end fringes of the width direction of belt-like sheets. <P>SOLUTION: The method for manufacturing the elastic sheet for continuously manufacturing the elastic sheet 3 in which the thread-like elastic bodies 7 are extendedly fixed between the pair of belt-like sheet, includes a fixing step conveying the thread-like elastic bodies 7 wound around a thread conveying longitudinal structure using an elastic body winder in the longitudinal direction of the same by the longitudinal structure and thereafter holding and fixing the same between the belt-like sheets 50, 60, the first cutting step cutting parts 72 extending out from both the end fringes of the belt-like sheets in the width direction in the thread-like elastic bodies 7 and thereby releasing the winding state to the longitudinal structure, and the second cutting step eliminating the whole or parts of the part 72 extending out from both the end fringes of the belt-like sheets 50, 60 in the width direction in the thread-like elastic bodies 7. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  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 the 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 a stretched 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 techniques described in Patent Documents 1 and 2, it is difficult to cut the portion extending from the edge in the width direction of the belt-like sheet in the thread-like elastic body with a short length, and the extended state is released and the edge is released. The portion extending from the left remains in a state of being oriented in an irregular direction, etc., and thus the manufactured stretchable sheet is unsatisfactory.

Japanese Unexamined Patent Publication No. 63-243309 JP 2010-22588 A

  Therefore, the subject of this invention is providing the manufacturing method of the elastic sheet which can eliminate the fault which the prior art mentioned above has.

  The present invention is a method for producing a stretchable sheet for continuously producing a stretchable sheet in which a thread-like elastic body is stretched between a pair of beltlike sheets in a direction extending in a direction intersecting the transport direction of the beltlike sheet. The thread-like elastic body is continuously wound around the thread-conveying longitudinal structure using the elastic body winding means, and the wound thread-like elastic body is transported in the longitudinal direction by the thread-conveying longitudinal structure. Thereafter, a fixing step of sandwiching and fixing between the belt-like sheets, and after the fixing 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 yarn of the yarn-like elastic body is cut A first cutting step for releasing the winding state with respect to the conveying longitudinal structure, and after the first cutting step, cutting all or part of the portion of the thread-like elastic body extending from both edges in the width direction of the belt-like sheet. A second cutting step to be removed To, there is provided a method for producing a 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.

FIG. 1 is a plan view showing a waist panel material and a deployable disposable diaper obtained by an embodiment of the present invention. FIG. 2 is a perspective view showing a stretchable sheet manufacturing apparatus suitably used for carrying out the manufacturing method of one embodiment of the present invention. FIG. 3 is a perspective view showing a configuration upstream of the rotary arm (elastic body winding means) of the apparatus shown in FIG. FIG. 4 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. 5 is a perspective view (corresponding to FIG. 4) showing another embodiment of the present invention. FIG. 6 is a perspective view (corresponding to FIG. 4) showing another 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. The filamentous elastic body in the present invention includes not only those having a circular or square cross section but also those having a narrow band shape such as an ellipse or a rectangular cross section, and a multifilament type can also be used. The width | variety (or diameter) of a thread-like elastic member is 0.1-3 mm, for example, Preferably it is 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, the preferable embodiment of the manufacturing method of the elastic sheet of this invention is demonstrated, referring an example for the case where the waist panel 3 (elastic sheet) of the diaper 1 mentioned above is manufactured.
FIG. 2 schematically shows a stretchable sheet manufacturing apparatus suitably used in the method for manufacturing the waist panel 3 (stretchable sheet) of the present embodiment. FIG. 4 schematically shows 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.

A manufacturing apparatus 11 shown in FIG. 2 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. 2 and 3, 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 extended 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 18 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 the longitudinal structure for yarn conveyance in the present invention, and the longitudinal direction of the longitudinal structure for yarn conveyance is the extending direction of both the conveyor belts 12 and 13 (y direction). It is.

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 conveyor belt 12 of the conveyor means 16 is an endless rotating belt, and includes an upper conveyor belt 12a and a lower conveyor belt 12b. 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 thread-like 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 122 (pulley 125) is 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 conveyance belt 13 of the conveyance means 16 is an endless rotating belt, similar to the conveyance belt 12, and includes an upper conveyance belt 13a and a lower conveyance belt 13b. 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 132 (pulley 135) is positioned outward in the x direction from the x direction end portions 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 stretched over the pulleys 131 and 132 and the pulleys 134 and 135 arranged as described above, and 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 unit is controlled by a control unit (not shown) included in the manufacturing apparatus 11.

  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) included in the manufacturing apparatus 11.

  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 twice around the outer periphery thereof. A control unit (not shown) provided in the manufacturing apparatus 11 controls the rotational speed of a servo motor (not shown), that is, the rotational speed of the feeding roller 152, based on the detection output from the tension measuring device 153. The body 7 can be unwound from the bobbin 70.

  As shown in FIG. 3, the elastic body supply means 15 includes a feed roller 156 located on the downstream side of the feeding roller 152. 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 11.

  As shown in FIG. 2, the integration unit 17 includes a pair of nip rollers 171 and 172. 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) included in the manufacturing apparatus 11. 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.

  As shown in FIG. 2, the cutting means 18 includes a cutter 180 having a sharp cutting blade where the conveyed elastic elastic body 7 contacts (the cutter 180 on the conveyor belt 13 side is not shown). The cutter 180 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 conveyor belts 12 and 13 and being pressed against the cutter 180. . In the y direction, the cutting means 18 includes a pair of nip rollers 171, 172, pulleys 121, 124 of the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b), and conveyor belt 13 (upper conveyor belt 13a, 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 18 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. As the cutting means 18, various known ones 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 19 shown in FIG. 4 is arranged downstream of the manufacturing apparatus 11 shown in FIG. 2 and performs a second cutting process on the stretchable sheet 3A manufactured by the manufacturing apparatus 11. In the first cutting step, as shown in FIG. 2, 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 18 described above, whereas the second cutting step is caused by the release of the stretched state by the first cutting step. This is a step of removing all or part of the portions 72, 72 extending from both edges in the width direction of the belt-like sheets 50, 60 in the sheet 3A, and is performed by the second cutting means 19. The portion 72 to be removed in the second cutting step is usually cut in a contracted state, but may be cut in a stretched state.

  As shown in FIG. 4, the second cutting means 19 includes a score cutter roller 193 and an anvil roller 194. The upstream and downstream sides of the score cutter roller 193 and the anvil roller 194 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 193 and the anvil roller 194.

As shown in FIG. 4, the score cutter roller 193 includes two cutter blades 195 and 195 spaced apart in the axial length direction. Each of the cutter blades 195 is formed over the entire circumference of the score cutter roller 193, and the interval between the two cutter blades 195 and 195 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. 4, the anvil roller 194 has a cylindrical outer peripheral surface extending between the two cutter blades 195 and 195 of the score cutter roller 193.

  In the vicinity of the second cutting means 19, as shown in FIG. 4, both ends in the width direction of the pair of belt-like sheets 50 and 60 cut by the pair of score cutter rollers 193 and anvil rollers 194 as the second cutting means 19. Are provided with suction portions 196 and 196 for sucking an unnecessary portion 72 of the thread-like elastic body 7 that has been extended. The suction part 196 is disposed so that the cutter blade 195 is close to the portion where the cutter blade 195 hits the peripheral surface of the anvil roller 194.

  Next, a method for producing an elastic 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.

  Then, the thread-like elastic body 7 is introduced into the rotating arm 14. When the thread-like elastic body 7 is introduced, the speed of the thread-like elastic body 7 introduced into the rotating arm 14 (elastic body winding means) by the feed roller 156 described above. 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. 2 and 3, the stretched elastic thread 7 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 conveying belts 12 and 13 extends in a direction intersecting with 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 non-opposed by a sailor (not shown) or the like, in which both side portions in the longitudinal direction (both ends in the x direction) are outer surfaces (surfaces that are 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. As shown in FIG. 2, 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). 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 in the form.

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.

Subsequently, the stretchable sheet 3A is conveyed to the second cutting means 19, and the second cutting means 19 extends the both ends of the elastic sheets 7A in the stretchable sheet 3A from the widthwise ends of the belt-like sheets 50 and 60. All or a part of the contracted portions 72, 72 to be removed is removed by cutting.
In the second cutting step in the present embodiment, as shown in FIG. 4, portions of the elastic sheet 3 </ b> A that extend from both ends in the width direction of the belt-like sheets 50 and 60 for any thread-like elastic body 7 in the y direction. Only cut off. More specifically, as shown in FIG. 4, 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 193 having an cutter blade 195 and an anvil roller 194. 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 transported to the second cutting means while the stretched state is maintained, the contracted portions 72 extending from both edges in the width direction of the belt-like sheets 50 and 60 are cut in that state. good.
By cutting the contracted portions 72 extending from both edges in the width direction of the belt-like sheets 50 and 60 by this second cutting step, unnecessary portions at both ends of the thread-like elastic body 7 can be aligned and cut and removed. The appearance of the produced elastic sheet is improved. In addition, by providing the suction portions 196, 196, inconveniences caused by cutting pieces generated by cutting the thread-like elastic body 7 into the elastic sheet 3 to be manufactured or adhering to the rollers 193, 194, etc. are 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 extending 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 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.

  According to this embodiment, after the first cutting step of releasing the wound state of the thread-like elastic body 7 around the pair of conveying belts 12 and 13, both ends in the width direction of the belt-like sheet in the thread-like elastic body 7 are separate processes. Since all or part of the contracted portions 72, 72 extending from the edges are cut, the unstable portions of the thread-like elastic body extending from both edges in the width direction of the belt-like sheets 50, 60 are efficiently removed. The elastic sheet 3 having a good appearance can be produced efficiently.

  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 present embodiment, the fixing step described above is performed using the belt-like sheets 50 and 60 that are narrowed by folding back both ends in the width direction (both ends in the x direction) to the outer surface side (non-opposing surface side). After performing the first cutting step and the second cutting step, the folded portions of the belt-like sheets 50 and 60 are expanded, and the expanded portions 50A and 60A of the pair of belt-like sheets are joined to each other. 4, 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 elastic sheet 3 finally obtained even in the second cutting step, even if the contracted portion 72 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 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 three-dimensional guard forming sheets 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 diaper 1 continuous body arranged for each absorber 23 to be manufactured 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 °. 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).

  Next, the second and third embodiments of the present invention will be described. About 2nd and 3rd embodiment, a different point from the embodiment mentioned above is mainly demonstrated, about the same point, the same code | symbol is attached | subjected and description is abbreviate | omitted. Points that are not particularly described can be the same as those in the above-described embodiment.

  In the second embodiment, as shown in FIG. 5, a shear cutter 19 </ b> A including two sliding blades in which one or both of them moves is used as the second cutting means. The shear cutters 19A are arranged on both sides of the stretchable sheet 3A. Like the clippers, the shear cutters 19A 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 second embodiment, the same effect as in the first embodiment can be obtained.

  In the third embodiment, as the pair of belt-like sheets 50 and 60 that sandwich the thread-like elastic body 7 after being transported by the pair of transport belts 12 and 13, sheets that are not folded back on both sides in the longitudinal direction are used. And when performing a 2nd cutting process with respect to the elastic sheet 3A obtained similarly to 1st Embodiment except using such strip | belt-shaped sheets 50 and 60, as shown in FIG. The portions on the inner side of both edges in the width direction of the sheets 50 and 60 are cut, and the contracted portions 72 of the thread-like elastic body 7 are removed together with the portions 50B and 60B of the belt-like sheets 50 and 60. More specifically, the position between the two cutter blades 195, 195 of the score cutter roller 193 is made narrower than the width of the belt-like sheets 50, 60, and the position spaced by a predetermined width from both edges in the width direction of the belt-like sheet 50, Pressure is applied between the cutter blade 195 of the score cutter roller 193 and the anvil roller 194, and the sheet is continuously cut along the longitudinal direction of the stretchable sheet 3A.

  According to the third embodiment, in this way, as shown in FIG. 6, the elastic sheet 3 having a good appearance in which the thread-like elastic body 7 does not extend from both edges in the width direction (edges in the x direction) is efficiently produced. Can be manufactured well.

  When the belt-like sheets 50 and 60 are cut and the contracted portions 72 extending from both edges in the sheet width direction are removed, the distances L2 and L2 from the both side edges of the belt-like sheet are as follows. A position that is 0 to 20% of the total width W of 50, 60 is preferable from the viewpoint that a sheet area that is cut and wasted can be suppressed, and the distances L2 and L2 are 0 to 10% of the total width W. It is more preferable from the same viewpoint that it is the position which becomes.

  The manufacturing method of the elastic sheet of this invention and the manufacturing method of a disposable diaper are not restrict | limited to the above-mentioned embodiment at all, and can be changed suitably.

  For example, the elastic body winding means includes a disk having a thread-shaped elastic body introduction portion at the rotating shaft portion and an arm protruding downstream from the disk in the y direction, and the arms are configured to convey belts 12 and 13. 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 WO 2005/060910 may be used instead of a pair of conveyor belts. In this case, only one conveyor belt may be used. Moreover, you may use the thread | yarn support member provided with the screw groove as described in FIGS. 4-6 of Unexamined-Japanese-Patent No. 2002-192641 as a longitudinal structure for thread | yarn conveyance.

  Further, instead of the score cutter roller 193 and the anvil roller 194 used in the third embodiment, a shear cutter in the form as used in the second embodiment can be used. Further, as a cutting means in the second cutting step, a score cutter or a shear cutter in another form can be used, and a fixed blade or a rotary blade 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.

  As the belt-like sheet of the first or second embodiment, a sheet in which both side portions in the longitudinal direction (both ends in the width direction of the sheet) are not folded as in the third embodiment 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.

In addition to the waist panel 3 of the disposable diaper 1, the stretchable sheet produced by the production method of the present invention includes a waist portion of a developed or pant-type disposable diaper, a pant-type sanitary napkin, a disposable underwear, and a disposable mask. It can also be used for 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.

DESCRIPTION OF SYMBOLS 1 Unfoldable disposable diaper 2 Absorbent main body 21 Top sheet 22 Back sheet 23 Absorber 24 Solid guard forming sheet 25 Elastic member 3 Elastic sheet 3A used for waist panel and waist panel Elastic sheet before second step 4 Panel material 5, 6 Sheet 50, 60 Band-shaped sheet 7 Threaded elastic body 70 Bobbin 11 Manufacturing apparatus 12 Conveying belt (part of the longitudinal structure for yarn conveyance)
12a Upper conveyor belt 12b Lower conveyor belt 13 Conveyor belt (part of the longitudinal structure for yarn conveyance)
13a Upper conveyance belt 13b Lower conveyance belt 14 Rotating arm (elastic body winding means)
DESCRIPTION OF SYMBOLS 15 Elastic body supply means 151 Tensor 152 Feed roller 153 Tension measuring device 156 Feed roller 17 Integration means 171, 172 Nip roller 18 Cutting means 180 Cutter 19, 19A Second cutting means 193 Score cutter roller 194 Anvil roller 195 Cutter blade A Belly Side, B Dorsal side, C Inseam

Claims (8)

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,
After continuously winding the thread-like elastic body on the longitudinal structure for yarn conveyance using the elastic body winding means, and transporting the wound thread-like elastic body in the longitudinal direction by the longitudinal structure for thread transportation A fixing step of sandwiching and fixing between the belt-like sheets, and after the fixing 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 to transport the yarn-like elastic body by the yarn A first cutting step for releasing the winding state of the longitudinal structure for use, and after the first cutting step, the whole or a part of the portion extending from the both ends in the width direction of the belt-like sheet in the thread-like elastic body is removed by cutting. The manufacturing method of the elastic sheet which comprises the 2nd cutting process to do.   The manufacturing method of the elastic sheet of Claim 1 which cut | disconnects only the part extended from the width direction both ends edge of the said strip | belt-shaped sheet in the said thread-like elastic body in a 2nd cutting process.   The manufacturing method of the elastic sheet of Claim 2 which cut | disconnects the said thread-like elastic body so that the length of the part extended from the width direction both ends edge of the said strip | belt-shaped sheet may be 5 mm or less in a 2nd cutting process.   The elastic sheet according to claim 1, wherein, in the second cutting step, a portion inside the widthwise end edges of the belt-like sheet is cut to remove the contracted portion of the thread-like elastic body together with a part of the belt-like sheet. Manufacturing method.   The method for producing a stretchable sheet according to claim 4, wherein the position at which the belt-like sheet is cut is a position where the distance from each of both ends in the width direction of the belt-like sheet is 0 to 20% of the entire width of the belt-like sheet. .   After the fixing step, the first cutting step, and the second cutting step described above are performed as a pair of the band-shaped sheets, the band-shaped sheets whose widthwise ends are folded back to the respective outer surface sides to be narrow, the band-shaped sheet is formed. The manufacturing method of the elastic sheet of any one of Claims 1-5 which expands the folding | turning part of each sheet | seat, and joins the expanded parts of a pair of this strip | belt-shaped sheet | seat. 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,
The manufacturing method of a disposable diaper which comprises the process of manufacturing the said elastic sheet with the manufacturing method of the elastic sheet of any one of Claims 1-6 . It is a method of manufacturing a disposable diaper using the elastic sheet obtained by the elastic sheet manufacturing method according to any one of claims 1 to 6 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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