JP2019099956A - Stretchable sheet manufacturing method and stretchable sheet manufacturing unit - Google Patents

Abstract

To efficiently manufacture a stretchable sheet by suppressing breakage of a tooth groove of a tooth groove roller when the sheet breaks.SOLUTION: A manufacturing method of a stretchable sheet 11 manufactures the stretchable sheet 11 by: supplying a substrate sheet 10 to an engaging part of a pair of tooth groove rollers 3a, 3b by a pair of infeed rollers 2a, 2b to extend the substrate sheet 10; and drawing an extended substrate sheet 10a from the engaging part while adding tension by a pair of outfeed rollers 4a, 4b. A breakage detection sensor 5 is disposed between the pair of tooth groove rollers 3a, 3b and the pair of outfeed rollers 4a, 4b in order to stop the pair of tooth groove rollers 3a, 3b and subsequently stop the pair of infeed rollers 2a, 2b when the breakage detection sensor 5 detects breakage during operation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of producing an elastic sheet and an apparatus for manufacturing an elastic sheet.

  Using a processing means provided with a pair of tooth groove rolls provided on the circumferential surface portion so that the tooth grooves meshing with each other along the rotational axis direction, the rolls are rotated to supply a sheet such as nonwoven fabric to the meshing portions. There have been proposed various techniques for subjecting the sheet to a stretching process.

  As a technique for drawing a sheet by using a pair of tooth groove rolls, the present applicant first makes one tooth groove roll the other tooth groove roll when the pair of tooth groove rolls are reactivated first. The manufacturing method of the elastic sheet made to space apart from is proposed (refer patent document 1).

JP, 2014-173209, A

  According to the method for producing an elastic sheet described in Patent Document 1, it is possible to prevent the sheet from being punctured or the sheet being broken when the pair of tooth groove rolls are reactivated. . However, Patent Document 1 does not describe at all the timing of stopping the pair of tooth groove rolls or the like when the sheet is broken while the pair of tooth groove rolls is in operation. The inventors of the present invention are a phenomenon in which breakage of the sheet during operation of the pair of groove rolls is a phenomenon which often occurs in the sheet joining portion of the sheet joined with the double-sided tape or the like. It was found that there is a risk of damaging the ditch.

  Therefore, an object of the present invention is to efficiently manufacture an elastic sheet by suppressing breakage of the teeth of the tooth groove roll when the sheet is broken during operation.

  In the present invention, a base sheet is supplied to the meshing portion of a pair of tooth groove rolls by a pair of in-feed rolls, and the base sheet is stretched in the conveying direction, and the stretched base sheets are output as a pair What is claimed is: 1. A method for producing a stretchable sheet, comprising drawing a stretchable sheet by pulling out from a pair of the grooved rolls while applying tension to the base sheet by a feed roll, comprising a pair of the grooved rolls and a pair of the outfeed rolls. And a break detection sensor for detecting breakage of the base sheet, and when the break detection sensor detects a break during operation, the pair of groove rolls are stopped, and then the pair is cut. A method for producing a stretchable sheet, comprising stopping the infeed roll of

  Further, according to the present invention, a pair of in-feed rolls, a pair of tooth groove rolls disposed on the downstream side of the pair of in-feed rolls in the conveyance direction of the base sheet, and a pair of tooth grooves in the conveyance direction A pair of outfeed rolls disposed downstream of the roll, and a control unit configured to control rotation of the pair of infeed rolls, the pair of tooth groove rolls, and the pair of outfeed rolls; The sheet is supplied to the meshing portion of the pair of gutter rolls by the pair of in-feed rolls, and the base sheet is stretched in the conveying direction, and the stretched base sheet is cut by the pair of out-feed rolls. It is a manufacturing apparatus of the elastic sheet which is pulled out from a pair of said gutter rolls, and manufacturing an elastic sheet, applying tension to said substrate sheet, A break detection sensor for detecting a break in the base sheet is disposed between the pair of groove rolls and the pair of outfeed rolls, and the control unit causes the break detection sensor to break during operation. It provides a manufacturing apparatus of an elastic sheet which stops a pair of said gutter rolls, and then stops said in-feed roll, when it detects.

  According to the method of manufacturing an elastic sheet of the present invention, since breakage of the teeth of the tooth groove roll can be suppressed when the sheet is broken during operation, the elastic sheet can be manufactured efficiently.

FIG. 1 is a schematic perspective view of a preferred embodiment of a manufacturing apparatus used for the method of manufacturing an elastic sheet of the present invention. FIG. 2 is a schematic side view of the manufacturing apparatus shown in FIG.

  Hereinafter, the method for producing a stretchable sheet of the present invention will be described based on its preferred embodiments with reference to the drawings. In describing the method for producing the stretchable sheet 11 of the present embodiment, the production apparatus 1 used in the production method will be described first. FIG. 1 shows a schematic perspective view of a manufacturing apparatus 1 used in the method of manufacturing an elastic sheet according to the present invention, and FIG. 2 shows a schematic side view of the manufacturing apparatus 1 shown in FIG. There is. In the following description, the direction in which the base sheet 10 for forming the stretchable sheet 11 is transported will be described as a Y direction, and the direction orthogonal to the transport direction Y and the width direction of the base sheet 10 transported will be described as an X direction.

  As shown in FIG. 1, the manufacturing apparatus 1 stretches the base sheet 10 into a pair of in-feed rolls 2 a and 2 b which are fed and supplied to the pair of tooth groove rolls 3 a and 3 b and the supplied base sheet 10. And a pair of outfeed rolls 4a and 4b for drawing out a pair of toothed groove rolls 3a and 3b for applying the second base material sheet 10a from the pair of toothed groove rolls 3a and 3b; A breakage detection sensor 5 for detecting breakage of the material sheet 10a and a control unit 6 are provided.

  As shown in FIG. 1, the pair of in-feed rolls 2 a and 2 b is disposed on the downstream side of the original fabric roll 10 r of the base sheet 10 in the transport direction Y of the base sheet 10. The pair of in-feed rolls 2a and 2b is a roll that supplies the base sheet 10 drawn from the raw fabric roll 10r to the meshing portion of the pair of tooth groove rolls 3a and 3b. Each in-feed roll 2a, 2b is a roll whose circumferential surface is smooth, and is disposed opposite to each other so that the axial direction is parallel to the X direction. A servomotor 2M is connected to one in-feed roll 2a. The servomotor 2M is electrically connected to a control unit 6 described later. The drive of the servomotor 2M is controlled by the control unit 6, and one infeed roll 2a is rotated at a circumferential speed V1 in the direction of the arrow R1 shown in FIG. The base sheet 10 is transported in the transport direction Y by rotation of one in-feed roll 2a in the rotation direction R1. The other in-feed roll 2b has a circumferential surface in contact with the circumferential surface of one in-feed roll 2a, and is rotated as the one in-feed roll 2a rotates. In the manufacturing apparatus 1, the other in-feed roll 2b is rotated along with the one in-feed roll 2a, but one in-feed roll 2a and the other in-feed roll 2b are connected by a gear or the like. Each may be rotated using the servomotor 2M.

  The pair of tooth groove rolls 3a and 3b are disposed downstream of the pair of in-feed rolls 2a and 2b in the conveyance direction Y of the base sheet 10, as shown in FIG. The pair of tooth groove rolls 3a and 3b is a roll for stretching the base sheet 10 supplied by the pair of in-feed rolls 2a and 2b in the transport direction Y. The tooth groove rolls 3a and 3b are engaged with each other, and are opposed to each other so that the axial direction is parallel to the X direction.

  The respective groove rolls 3a and 3b alternately have convex ridges (teeth) 30 extending in the axial direction and grooves 31 extending in the axial direction along the circumferential direction of the rolls. The pitch of the ridges 30 adjacent to each other in the circumferential direction of the one tooth groove roll 3a is the same as that of the ridges 30 in the other tooth groove roll 3b.

  The pitch of the ridges 30 adjacent to each other in the circumferential direction in each tooth groove roll 3a, 3b is preferably 0.5 mm or more and 10.0 mm or less, and more preferably 1.5 mm or more and 5.0 mm or less . 0.25 times or more and less than 1.0 times of the pitch is preferable, and 0.3 times or more and 0.5 times or less of the width (length along a roll peripheral direction) in the root of convex streak part 30 are more preferred. The height of the ridges 30 is preferably 0.5 times to 10.0 times the pitch of the ridges 30, and more preferably 1.0 times to 5.0 times. The pitch of the adjacent ridges 30 in the tooth groove rolls 3a and 3b means the distance between the center line of one ridge 30 and the center line of the ridges 30 adjacent thereto. The width of the ridges 30 is not uniform, and may be a trapezoidal shape that narrows from the root of the ridges 30 to the tip of the ridges 30. The height of the ridges 30 refers to the length from the root to the tip of the ridges 30. It is preferable to chamfer the corner of the tip of the ridge 30.

  The meshing depth of the ridges 30 of each tooth groove roll 3a, 3b is preferably not less than the pitch when the pitch is in the above-described range from the viewpoint of sufficiently expanding the base sheet 10. Specifically, 1.0 mm or more is preferable, and 2.0 mm or more is more preferable. The meshing depth of the ridges 30 refers to the length by which adjacent ridges 30 overlap when the tooth groove rolls 3a and 3b are meshed with each other and rotated.

  A servomotor 3M is connected to one of the tooth groove rolls 3a. As shown in FIG. 1, the servomotor 3M is electrically connected to a control unit 6 described later. The servo motor 3M is controlled by the control unit 6 so as to rotate one of the tooth groove rolls 3a in the direction of arrow R2 shown in FIG. 1 at a peripheral speed V2. The base sheet 10 is transported in the transport direction Y by rotation of one of the tooth groove rolls 3 a in the rotation direction R2. In the other tooth groove roll 3b, the ridges 30 of the other tooth groove roll 3b are loosely inserted in the grooves 31 of one tooth groove roll 3a, and the one tooth groove roll 3a is rotated. It's supposed to take me around and rotate. In the manufacturing apparatus 1, the other tooth groove roll 3b is rotated along with the one tooth groove roll 3a, but one tooth groove roll 3a and the other tooth groove roll 3b are connected by a gear or the like. You may make it rotate each using servomotor 3M.

  The pair of outfeed rolls 4a and 4b are disposed on the downstream side of the pair of tooth groove rolls 3a and 3b in the conveyance direction Y of the base sheet 10, as shown in FIG. The pair of outfeed rolls 4a and 4b are rolls for producing the stretchable sheet 11 by pulling out while applying tension to the base sheet 10a stretched by the pair of tooth groove rolls 3a and 3b. Each outfeed roll 4a, 4b is a roll whose circumferential surface is smooth, and is disposed opposite to each other so that the axial direction is parallel to the X direction. A servomotor 4M is connected to one outfeed roll 4a. The servomotor 4M is electrically connected to a control unit 6 described later. The drive of the servomotor 4M is controlled by the control unit 6, and one outfeed roll 4a is rotated at a circumferential speed V3 in the direction of the arrow R3 shown in FIG. The base sheet 10 is transported in the transport direction Y by rotation of one out-feed roll 4a in the rotational direction R3. The other outfeed roll 4b has a circumferential surface in contact with the circumferential surface of one outfeed roll 4a, and is rotated as the one outfeed roll 4a rotates. In the manufacturing apparatus 1, the other outfeed roll 4b is rotated along with the one outfeed roll 4a, but one outfeed roll 4a and the other outfeed roll 4b are connected by a gear or the like. Each may be rotated using a servomotor 4M.

  The breakage detection sensor 5 is disposed between the tooth groove rolls 3a and 3b and the outfeed rolls 4a and 4b, as shown in FIG. In the manufacturing apparatus 1, the fracture detection sensor 5 is an image sensor, and the stretch-processed base sheet 10 a is imaged by the image sensor 5 to detect the fracture of the base sheet 10 a. The image sensor 5 is disposed immediately after the meshing portion of the pair of tooth groove rolls 3 a and 3 b in the conveyance direction Y of the base sheet 10. The image sensor 5 is disposed to face the base sheet 10a subjected to the stretching process. The image sensor 5 can pick up an image of the base sheet 10a over the entire area in the width direction X of the base sheet 10a. The image sensor 5 can pick up a color image or a monochrome image of the base sheet 10a. The image sensor 5 is electrically connected to a control unit 6 described later, and an image captured by the image sensor 5 is transmitted to the control unit 6.

  For example, an area sensor camera or a line scan camera can be used as the image sensor 5. When an area sensor camera or a line scan camera is used, the resolution of the camera is preferably 160 μm / pixel or more. When a line scan camera is used, it is preferable to install the camera such that the direction in which the imaging elements in the line scan camera are arranged is the width direction X of the base sheet 10.

  The control unit 6 controls the rotation of the pair of in-feed rolls 2a and 2b, the pair of tooth groove rolls 3a and 3b, and the pair of out-feed rolls 4a and 4b. Specifically, as shown in FIG. 2, the control unit 6 includes servomotors 2M, 3M, 4M for the pair of infeed rolls 2a, 2b, the pair of tooth groove rolls 3a, 3b, and the pair of outfeed rolls 4a, 4b. The servo amplifier 60 controls the rotational speed of the motor. Further, the control unit 6 has a programmable logic control 61 (hereinafter also referred to as a PLC 61) electrically connected to the servo amplifier. The rotational speed of each of the servomotors 2M, 3M and 4M is controlled by the command from the PLC 61 through the servo amplifier 60. That is, the PLC 61 controls the peripheral speeds V1, V2, V3 of the pair of infeed rolls 2a, 2b, the pair of tooth groove rolls 3a, 3b, and the pair of outfeed rolls 4a, 4b.

  While the above is the main configuration of the manufacturing apparatus 1 used in the present embodiment, there is no particular limitation on the type of the base sheet 10 to be subjected to stretching processing in the manufacturing apparatus 1, and, for example, paper, single layer non-woven fabric, Examples thereof include resin films, laminates of two or more types of nonwoven fabrics, laminates of resin films and nonwoven fabrics, and the like. Specifically, examples of the base sheet 10 include thermoplastic polymer nonwoven fabrics of polyolefin fibers selected from polypropylene fibers, fibers composed of a composition of polypropylene and polyethylene, and bicomponent fibers of polypropylene and polyethylene.

  In addition, from the viewpoint of imparting extensibility to the base sheet 10 and imparting flexibility by stretching with the manufacturing apparatus 1, a non-woven fabric containing elastic fibers is preferable. As a non-woven fabric containing elastic fibers, a non-elastic fiber layer composed of substantially non-elastic fibers is disposed on at least one side of an elastic fiber layer containing elastic fibers, and both fiber layers are constituent fibers of the elastic fiber layer A stretchable nonwoven fabric (hereinafter referred to as stretchable composite nonwoven fabric) joined by heat fusion and a number of elastic filaments arranged so as to extend in one direction without crossing each other while maintaining the fiber form, Included are stretchable nonwovens that are joined to an extensible nonwoven over their entire length in a substantially unstretched state. When the substrate sheet 10 has elasticity, the substrate sheet 10 after the stretching process develops stretchability along the stretching direction.

  As the elastic fibers, fibers made of a thermoplastic elastomer such as a styrene-based elastomer, a polyolefin-based elastomer, a polyester-based elastomer, or a polyurethane-based elastomer, and an elastic resin such as rubber are used as a raw material. Further, as the non-elastic fiber, a fiber made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide or the like is used.

  As the stretchable composite non-woven fabric, various known ones can be used. For example, stretchable sheets described in JP-A-2008-179128, stretchable sheets described in JP-A-2007-22066, JP-A-2007- An elastic nonwoven fabric manufactured by the method for manufacturing an elastic nonwoven fabric described in JP-A-22066, a laminated sheet described in JP-A-10-029259, and the like can also be used.

Next, a method of manufacturing the stretchable sheet of the present invention will be described by a method of continuously manufacturing the stretchable sheet 11 using the above-described manufacturing apparatus 1 which is an embodiment.
In order to stretch the base sheet 10 using the base sheet 10 described above by the manufacturing apparatus 1 shown in FIGS. 1 and 2 and obtain the target stretchable sheet 11, first, the base sheet 10 is used as a base sheet. The sheet is fed from the opposite roll 10r and supplied to the pair of in-feed rolls 2a and 2b. In the present embodiment, the feeding speed V4 of the base sheet 10 from the raw fabric roll 10r and the peripheral speed V1 of the pair of infeed rolls 2a and 2b at the time of supply of the base sheet 10 are equal (V1 = V4). It is. Then, the base sheet 10 is transported in the transport direction Y while being sandwiched by the pair of in-feed rolls 2a and 2b, and the base sheet 10 is supplied to the meshing portion of the pair of tooth groove rolls 3a and 3b.

  The supply speed of the base material sheet 10 supplied to the meshing portion of the pair of tooth groove rolls 3a and 3b is higher than the speed of the drawing process of the pair of tooth groove rolls 3a and 3b. The supply speed of the base sheet 10 is the same as the peripheral speed V1 of the pair of in-feed rolls 2a and 2b. The circumferential speed V1 of the pair of in-feed rolls 2a and 2b is the circumferential speed on the outer peripheral surface of the pair of in-feed rolls 2a and 2b. Moreover, the speed of the drawing process in a pair of tooth groove roll 3a, 3b is the circumferential speed V2 in the front-end | tip part of the convex streak part 30. FIG. Accordingly, the peripheral speed V2 of the pair of tooth groove rolls 3a and 3b is slower than the peripheral speed V1 of the pair of in-feed rolls 2a and 2b (V1> V2). The circumferential speed V3 of the pair of outfeed rolls 4a and 4b is higher than the circumferential speed V2 of the pair of tooth groove rolls 3a and 3b. The circumferential speed V3 of the pair of outfeed rolls 4a and 4b is the circumferential speed on the outer peripheral surface of the pair of outfeed rolls 4a and 4b. Then, the draw ratio ((V2) determined from the circumferential velocity V2 and the velocity ratio (V2 / V3) of the circumferential velocity V3 and the tooth groove elongation degree obtained from the meshing depth of the pair of tooth groove rolls 3a and 3b The base sheet 10 is stretched by / V3) × (degree of groove extension)). Thus, even if the peripheral speed V2 of the pair of tooth groove rolls 3a, 3b is slower than the peripheral speed V1 of the pair of infeed rolls 2a, 2b, the pair of infeed rolls 2a, 2b and the pair of tooth grooves Tension is generated in the base sheet 10 between the rolls 3a and 3b. The degree of extension of the tooth space is set by setting the meshing depth for one base sheet and engaging the tooth groove roll so that the magnification when the base sheet is stretched is several times the original elongation It is a value obtained from a drawing such as CAD.

  Under this condition, as shown in FIG. 1, the base sheet 10 is stretched in the transport direction Y at the meshing portion of the pair of tooth groove rolls 3a and 3b. In the meshing portion, the base sheet 10 is stretched between the ridges 30 of one tooth groove roll 3a and the ridges 30 of the other tooth groove roll 3b adjacent thereto. That is, the base sheet 10 is stretched. Thereby, the substrate sheet 10 is plastically and / or elastically deformed. When the base material sheet 10 is plastically deformed by the drawing of the base material sheet 10, the base material sheet 10 does not return to its original length but remains in the expanded state even when the drawing state is released. On the other hand, when the substrate sheet 10 is elastically deformed by the stretching of the substrate sheet 10, when the stretched state is released, the substrate sheet 10 is elastically shrunk to a state close to the original length. When plastic deformation and elastic deformation occur simultaneously in the base sheet 10 due to the drawing of the base sheet 10, the state after the release of the drawn state changes according to the degree of the plastic deformation and the elastic deformation.

  Then, as shown in FIG. 1, the stretched base sheet 10a is supplied to the pair of outfeed rolls 4a and 4b, and the pair of outfeed rolls 4a and 4b apply tension to the base sheet 10a. Pull out from the tooth groove rolls 3a, 3b. In the present embodiment, the relationship between the peripheral speed V3 of the pair of outfeed rolls 4a and 4b and the peripheral speed V1 of the pair of infeed rolls 2a and 2b is set to V3> V1. By setting in this way, the drawn base sheet 10a can be pulled out without causing slack.

  Here, when at least plastic deformation occurs due to the stretching of the base sheet 10, for example, the pair of out feed rolls 4a, 4b immediately after the base sheet 10 passes through the meshing portion of the pair of tooth groove rolls 3a and 3b. When 4b draws out the base material sheet 10a by which the extending | stretching process was carried out, this base material sheet 10a may fracture due to the fracture | rupture of the constituent fiber of this base material sheet 10a. In particular, when the base sheet 10 to which paper splicing has been performed with double-sided tape or the like is subjected to drawing processing at the meshing portion, the base is located at the downstream boundary portion in the transport direction Y with the portion where double-sided tape is positioned. The material sheet 10a is easily broken. "Breaking of the base sheet 10a" refers to a state in which the base sheet 10a is completely separated and cut on the upstream side and the downstream side while the pair of tooth groove rolls 3a and 3b is driven, and the holes It does not include the state in which a part of the state such as the open state is connected. In the present embodiment, as shown in FIG. 2, the base material stretched by the breakage detection sensor 5 disposed immediately after the meshing portion of the pair of tooth groove rolls 3a and 3b in the conveyance direction Y of the base material sheet 10. The presence or absence of breakage immediately after passing through the engagement portion of the sheet 10a is detected. In the present embodiment, as shown in FIG. 1, imaging is performed over the entire area in the width direction X of the base sheet 10 a stretched by using the image sensor 5, and the imaged image data is transmitted to the control unit 6. The control unit 6 analyzes the obtained image data to detect breakage of the base sheet 10a. For example, the obtained image data can be binarized to detect breakage of the base sheet 10a.

  When breakage of the base sheet 10a is detected during operation, the control unit 6 stops the rotation of the pair of tooth groove rolls 3a, 3b and the pair of infeed rolls 2a, 2b. Specifically, the pair of tooth groove rolls 3a and 3b are stopped, and then the pair of infeed rolls 2a and 2b are stopped. Note that "stop of the pair of tooth groove rolls 3a, 3b" is not only when the rotation of the pair of tooth groove rolls 3a, 3b is completely stopped, but, for example, rotation to the pair of tooth groove rolls 3a, 3b In the case where the tooth groove rolls 3a and 3b rotate with inertia after outputting a stop instruction to the servomotor 3M, the peripheral speed of the tooth groove rolls 3a and 3b may be slow after the instruction.

  In the present embodiment, when breakage of the base sheet 10a is detected during operation, as shown in FIG. 2, a command to stop rotation is output from the PLC 61 to the servo amplifier 60 to stop the servomotor 3M. When the servomotor 3M is stopped, the rotation of the pair of tooth groove rolls 3a and 3b is stopped. Next, a rotation stop command is output from the PLC 61 to the servo amplifier to stop the servomotor 2M. When the servomotor 2M stops, the rotation of the pair of infeed rolls 2a and 2b stops. By stopping the rotation of the pair of infeed rolls 2a and 2b after stopping the rotation of the pair of tooth groove rolls 3a and 3b, the pair of infeed rolls 2a and 2b and the pair of teeth are broken when the base sheet 10a is broken. It is suppressed that the substrate sheet 10a is pulled back to the pair of in-feed rolls 2a and 2b by the tension between the grooved rolls 3a and 3b. Therefore, for example, when the base sheet 10a joined by double-sided tape is broken at the boundary of the double-sided tape, the portion where the double-sided tape is positioned is pulled back to the meshing portion, and the meshing portion It is possible to effectively prevent the double-sided adhesive tape from sticking to one of the pair of tooth groove rolls 3a and 3b. By preventing sticking of the double-sided tape to the pair of tooth groove rolls 3a and 3b, it is possible to prevent the portion of the tooth to which the double-sided tape is stuck from being damaged by the double-sided tape.

  When the base sheet 10a pulled back to the pair of in-feed rolls 2a and 2b is broken away from the meshing portion of the pair of tooth groove rolls 3a and 3b, the ridges 30 of the tooth grooves 3a and 3b are removed. Although direct contact between them may cause breakage, this can also be prevented because it is suppressed that the broken base sheet 10a is pulled back from the engagement portion.

  In addition, even when the base sheet 10a in which paper splicing is not performed is broken, for example, the broken portion of the base sheet 10a is engaged with one of the pair of tooth groove rolls 3a and 3b and the tooth groove roll 3a is formed. , 3b can prevent the tooth grooves of the grooved rolls 3a, 3b from being broken by the base sheet 10a wound and wound.

  Further, in the present embodiment, since the peripheral speed V1 of the pair of in-feed rolls 2a and 2b is faster than the peripheral speed V2 of the pair of tooth groove rolls 3a and 3b (V1> V2), for example, the base sheet 10a is in operation Even if the base sheet 10a is broken, the base sheet 10a is conveyed in the conveying direction Y by the pair of in-feed rolls 2a and 2b, and the broken portion is less likely to be pulled back to the meshing portion of the pair of tooth groove rolls 3a and 3b. ing. Therefore, breakage of the tooth grooves of the pair of tooth groove rolls 3a and 3b can be more effectively prevented.

  In order to stop the pair of tooth groove rolls 3a and 3b, the pair of tooth groove rolls 3a and 3b rotate with inertia after outputting an instruction to stop rotation of the pair of tooth groove rolls 3a and 3b to the servomotor 3M. In this case, the circumferential speed of the pair of groove rolls 3a, 3b may be delayed after the instruction, but it is preferable that the rotation is completely stopped.

  The timing for stopping the rotation of the pair of in-feed rolls 2a and 2b is, for example, the pair of tooth groove rolls 3a in consideration of the stop time until the inertia rotation of the pair of tooth groove rolls 3a and 3b is completely stopped. , And 3b may be output after a predetermined time has elapsed after the rotation stop command is output to the servomotor 3M. The predetermined time is preferably 0.1 seconds to 5 seconds, and more preferably 0.5 seconds to 3 seconds.

  When breakage of the substrate sheet 10a is not detected from the image captured by the image sensor 5, the substrate is processed by extending from the meshing portion of the pair of tooth groove rolls 3a and 3b using the pair of outfeed rolls 4a and 4b. The sheet 10a is drawn out, and the stretchable sheet 11 in which a desired tension is applied to the base sheet 10a is continuously manufactured.

  When the production of the above-described stretchable sheet 11 is completed, the operation of the production apparatus 1 of the stretchable sheet 11 is stopped. Further, the operation of the manufacturing apparatus 1 is also stopped when performing maintenance such as various adjustments, and trouble inspection. As described above, when the breakage detection sensor 5 does not detect breakage of the base sheet 10a and the operation of the manufacturing apparatus 1 is stopped, the pair of infeed rolls 2a and 2b and the pair of tooth groove rolls 3a and 3b can be arbitrarily selected. Stop in order. “Stopping the operation of the manufacturing apparatus 1 without detecting the breakage of the base sheet 10 a without detecting the breakage of the base sheet 10 a” means stopping the production of the elastic sheet 11 in a planned manner, Stopping under unpredictable circumstances, such as when the material sheet 10a breaks, is not included. In the present embodiment, the pair of in-feed rolls 2a and 2b and the pair of tooth groove rolls 3a and 3b are stopped at the same timing. Specifically, the rotation stop command is output from the PLC 61 to the servomotors 2M and 3M through the servo amplifier 60 at the same timing, and the pair of infeed rolls 2a and 2b and the pair of tooth groove rolls 3a and 3b are the same timing Stop at Furthermore, in the present embodiment, when the breakage detection sensor 5 does not detect breakage of the base sheet 10a without stopping detection, a rotation stop instruction is output from the PLC 61 to the servomotor 4M via the servo amplifier 60 at the same timing. The outfeed rolls 4a and 4b also stop at the same timing as the pair of infeed rolls 2a and 2b and the pair of tooth groove rolls 3a and 3b.

  As described above, in the present manufacturing method, only after the breakage detection sensor 5 detects breakage of the stretched base sheet 10 a during operation of the manufacturing apparatus 1, after stopping the pair of tooth groove rolls 3 a and 3 b Since the pair of in-feed rolls 2a and 2b is stopped, breakage of the tooth grooves of the pair of tooth groove rolls 3a and 3b can be prevented, and the stretchable sheet can be efficiently manufactured.

  Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the embodiments. For example, in the present embodiment, an image sensor is used as the breakage detection sensor, but instead of the image sensor, a breakage of the base sheet may be detected using a laser sensor, and the base may be detected using a tension sensor. The breakage of the material sheet may be detected.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2a, 2b Infeed roll 2M servomotor 3a, 3b Tooth groove roll 30 Convex ridge 31 groove 3M Servomotor 4a, 4b Outfeed roll 4M Servomotor 5 Image sensor (break detection sensor)
6 Control Unit 10 Base Material Sheet 11 Stretchable Sheet

Claims (7)

The base sheet is supplied to the meshing portion of the pair of tooth groove rolls by a pair of in-feed rolls, and the base sheet is stretched in the conveying direction, and the stretched base sheet is cut by a pair of out-feed rolls. A method for producing a stretchable sheet, comprising drawing a base sheet from a pair of the grooved rolls while applying tension to the base sheet to produce a stretchable sheet,
A breakage detection sensor for detecting breakage of the base sheet is disposed between the pair of tooth groove rolls and the pair of outfeed rolls, and when the breakage detection sensor detects breakage during operation, A method of manufacturing a stretchable sheet, comprising stopping a pair of the grooved rolls and then stopping a pair of the in-feed rolls.   The manufacturing method of the elastic sheet of Claim 1 which stops a pair of said tooth groove roll and a pair of said in-feed rolls at the same timing, when stopping without detecting the said fracture | rupture.   The method for manufacturing an elastic sheet according to claim 1, wherein the breakage detection sensor detects the breakage of the base sheet immediately after passing through the meshing portion of the pair of groove rolls.   The manufacturing method of the elastic sheet in any one of Claims 1-3 whose circumferential speed of a pair of said tooth groove roll is slower than the circumferential speed of a pair of said in-feed rolls. The fracture detection sensor is an image sensor,
The manufacturing method of the elastic sheet in any one of Claims 1-4 which images the said base material sheet with the said image sensor, and detects a fracture | rupture of this base material sheet.   The method according to any one of claims 1 to 5, wherein when stopping without detecting the breakage, the pair of gutter rolls, the pair of infeed rolls, and the pair of outfeed rolls are stopped at the same timing. Of elastic sheet production. A pair of infeed rolls,
A pair of tooth groove rolls disposed downstream of the pair of in-feed rolls in the conveyance direction of the base sheet;
A pair of outfeed rolls disposed downstream of the pair of groove rolls in the transport direction;
A control unit configured to control rotation of the pair of in-feed rolls, the pair of tooth grooves and the pair of out-feed rolls;
The base sheet is supplied to the meshing portion of the pair of groove rolls by the pair of in-feed rolls, and the base sheet is stretched in the conveying direction, and the stretched base sheet is out of the pair A stretch sheet manufacturing apparatus for producing a stretch sheet by pulling out from a pair of the grooved rolls while applying tension to the base sheet by a feed roll,
A breakage detection sensor for detecting breakage of the base sheet is disposed between the pair of tooth groove rolls and the pair of outfeed rolls,
The said control part is a manufacturing apparatus of an elastic sheet which stops a pair of said tooth groove roll, and then stops said in-feed roll, when the said fracture detection sensor detects a fracture | rupture in operation.

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