JP7029949B2 - How to manufacture elastic sheet - Google Patents

Description

The present invention relates to a method for manufacturing 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 peripheral surface so that the tooth grooves that mesh with each other are along the direction of the axis of rotation, the rolls are rotated to supply a sheet such as a non-woven fabric to the meshing portions. Therefore, various techniques for stretching the sheet have been proposed.

As a technique for stretching a sheet using a pair of tooth groove rolls, the applicant first, when restarting the pair of the tooth groove rolls, one tooth groove roll is used as the other tooth groove roll. We have proposed a method for manufacturing an elastic sheet that is separated from the above (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-173209

According to the method for manufacturing an elastic sheet described in Patent Document 1, it is possible to prevent the sheet from having holes or the sheet from breaking when the pair of tooth groove rolls are restarted. .. 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 breaks during the operation of the pair of tooth groove rolls. The present inventors have a phenomenon in which breakage of a sheet during operation of a pair of tooth groove rolls often occurs in a paper spliced portion of a sheet spliced with double-sided tape or the like, and the double-sided tape is attached to the roll to provide teeth. It was found that there is a risk of damaging the groove.

Therefore, an object of the present invention is to prevent the teeth of the tooth groove roll from being damaged when the sheet is broken during operation, and to efficiently manufacture the stretchable sheet.

In the present invention, the base material sheet is supplied to the meshing portion of the pair of tooth groove rolls by a pair of in-feed rolls, the base material sheet is stretched in the transport direction thereof, and the stretched base material sheet is paired out. A method for manufacturing an elastic sheet, which is a method of manufacturing an elastic sheet by pulling out from a pair of tooth groove rolls while applying tension to the base material sheet by a feed roll, wherein the pair of tooth groove rolls and the pair of out feed rolls are used. A break detection sensor for detecting breakage of the base material sheet is arranged between the two, and when the breakage detection sensor detects breakage during operation, the pair of the tooth groove rolls is stopped, and then a pair. The present invention provides a method for manufacturing an elastic sheet for stopping the in-feed roll.

The present invention also includes a pair of infeed rolls, a pair of tooth groove rolls arranged on the downstream side of the pair of infeed rolls in the transport direction of the base sheet, and a pair of the tooth grooves in the transport direction. The base material comprises a pair of outfeed rolls arranged on the downstream side of the roll, a pair of infeed rolls, a pair of tooth groove rolls, and a control unit for controlling rotation of the pair of outfeed rolls. The sheet is supplied to the meshing portion of the pair of tooth groove rolls by the pair of the in-feed rolls, the base sheet is stretched in the transport direction, and the stretched base sheet is stretched by the pair of out-feed rolls. An elastic sheet manufacturing device for manufacturing a stretchable sheet by pulling it out from a pair of tooth groove rolls while applying tension to the base material sheet, between the pair of tooth groove rolls and the pair of outfeed rolls. A break detection sensor for detecting breakage of the base material sheet is arranged, and the control unit stops the pair of tooth groove rolls when the breakage detection sensor detects breakage during operation, and then stops the pair of tooth groove rolls. , Provided is an apparatus for manufacturing an elastic sheet for stopping the in-feed roll.

According to the method for manufacturing an elastic sheet of the present invention, it is possible to prevent the teeth of the tooth groove roll from being damaged when the sheet is broken during operation, so that the elastic sheet can be efficiently manufactured.

FIG. 1 is a schematic perspective view of a preferred embodiment of a manufacturing apparatus used in the method for 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 an elastic sheet of the present invention will be described with reference to the drawings based on the preferred embodiment thereof. In explaining the manufacturing method of the elastic sheet 11 of the present embodiment, the manufacturing apparatus 1 used in the manufacturing method will be described first. FIG. 1 shows a schematic perspective view of the manufacturing apparatus 1 used in the method for manufacturing an elastic sheet of 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 forming the elastic sheet 11 is conveyed is defined as the Y direction, the direction orthogonal to the transport direction Y and the width direction of the substrate sheet 10 to be conveyed are described as the X direction.

As shown in FIG. 1, the manufacturing apparatus 1 feeds the base sheet 10 and supplies the pair of in-feed rolls 2a and 2b to the pair of tooth groove rolls 3a and 3b, and the base sheet 10 is stretched. A pair of tooth groove rolls 3a, 3b to be subjected to the process, a pair of outfeed rolls 4a, 4b for pulling out the stretched base sheet 10a from the pair of tooth groove rolls 3a, 3b, and the base generated during operation. A break 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 2a and 2b are arranged on the downstream side of the raw fabric roll 10r of the base sheet 10 in the transport direction Y of the base sheet 10. The pair of in-feed rolls 2a and 2b are rolls that supply the base sheet 10 unwound from the raw fabric roll 10r to the meshing portions of the pair of tooth groove rolls 3a and 3b. Each of the in-feed rolls 2a and 2b is a roll having a smooth peripheral surface, and is arranged so as to face each other so that the axial direction is parallel to the X direction. A servomotor 2M is connected to one of the infeed rolls 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 of the infeed rolls 2a is rotated in the direction of arrow R1 shown in FIG. 1 at a peripheral speed V1. When one of the in-feed rolls 2a rotates in the rotation direction R1, the base sheet 10 is conveyed in the transfer direction Y. The peripheral surface of the other infeed roll 2b is in contact with the peripheral surface of one infeed roll 2a, and the other infeed roll 2b rotates along with the rotation of the one infeed roll 2a. In the manufacturing apparatus 1, the other infeed roll 2b is rotated around the one infeed roll 2a, but the one infeed roll 2a and the other infeed roll 2b are connected by a gear or the like. A servomotor 2M may be used to rotate each of them.

As shown in FIG. 1, the pair of tooth groove rolls 3a and 3b are arranged on the downstream side of the pair of infeed rolls 2a and 2b in the transport direction Y of the base sheet 10. The pair of tooth groove rolls 3a and 3b are rolls for stretching the base sheet 10 supplied by the pair of infeed rolls 2a and 2b in the transport direction Y. The tooth groove rolls 3a and 3b are configured to mesh with each other, and are arranged so as to face each other so that the axial directions are parallel to the X direction.

Each of the tooth groove rolls 3a and 3b has ridges (teeth) 30 extending in the axial direction thereof and grooves 31 extending in the axial direction alternately along the circumferential direction of the roll. 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 of the other tooth groove roll 3b.

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

The meshing depth of the convex portions 30 of the tooth groove rolls 3a and 3b is preferably equal to or greater than the pitch when the pitch is in the above range from the viewpoint of sufficiently extending the base sheet 10. , 1.0 mm or more is preferable, and 2.0 mm or more is more preferable. The meshing depth of the ridges 30 means the length at which the adjacent ridges 30 overlap each other when the tooth groove rolls 3a and 3b are meshed 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 drive of the servomotor 3M is controlled by the control unit 6, and one of the tooth groove rolls 3a is rotated in the direction of arrow R2 shown in FIG. 1 at a peripheral speed V2. When one of the tooth groove rolls 3a rotates in the rotation direction R2, the base sheet 10 is conveyed in the transfer direction Y. In the other tooth groove roll 3b, the convex portion 30 of the other tooth groove roll 3b is loosely inserted and arranged in the groove 31 of the one tooth groove roll 3a, and the rotation of the one tooth groove roll 3a It is designed to rotate around. In the manufacturing apparatus 1, the other tooth groove roll 3b is rotated around the one tooth groove roll 3a, but the one tooth groove roll 3a and the other tooth groove roll 3b are connected by a gear or the like. A servomotor 3M may be used to rotate each of them.

As shown in FIG. 1, the pair of outfeed rolls 4a and 4b are arranged on the downstream side of the pair of tooth groove rolls 3a and 3b in the transport direction Y of the base sheet 10. The pair of outfeed rolls 4a and 4b are rolls for producing the elastic sheet 11 by pulling out the base sheet 10a stretched by the pair of tooth groove rolls 3a and 3b while applying tension. Each of the outfeed rolls 4a and 4b is a roll having a smooth peripheral surface, and is arranged so as to face each other so that the axial direction is parallel to the X direction. A servomotor 4M is connected to one of the outfeed rolls 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 of the outfeed rolls 4a is rotated in the direction of arrow R3 shown in FIG. 1 at a peripheral speed V3. When one of the outfeed rolls 4a rotates in the rotation direction R3, the base sheet 10 is conveyed in the transfer direction Y. The peripheral surface of the other outfeed roll 4b is in contact with the peripheral surface of one outfeed roll 4a, and the other outfeed roll 4b rotates along with the rotation of the one outfeed roll 4a. In the manufacturing apparatus 1, the other outfeed roll 4b is rotated around the one outfeed roll 4a, but the one outfeed roll 4a and the other outfeed roll 4b are connected by a gear or the like. A servomotor 4M may be used to rotate each of them.

As shown in FIG. 1, the breakage detection sensor 5 is arranged between the tooth groove rolls 3a and 3b and the outfeed rolls 4a and 4b. In the manufacturing apparatus 1, the breakage detection sensor 5 is an image sensor, and the stretched base sheet 10a is imaged by the image sensor 5 to detect the breakage of the base sheet 10a. The image sensor 5 is arranged immediately after the meshing portion of the pair of tooth groove rolls 3a and 3b in the transport direction Y of the base sheet 10. The image sensor 5 is arranged so as to face the base sheet 10a that has been stretched. The image sensor 5 is capable of taking an image of the base sheet 10a over the entire width direction X of the base sheet 10a. Further, the image sensor 5 can capture a color image or a monochrome image of the base material 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.

As the image sensor 5, for example, an area sensor camera, a line scan camera, or the like can be used. When an area sensor camera, a line scan camera, or the like 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 so that the direction in which the image pickup elements are arranged in the line scan camera 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 has servomotors 2M, 3M, 4M of a pair of in-feed rolls 2a, 2b, a pair of tooth groove rolls 3a, 3b, and a pair of out-feed rolls 4a, 4b. It has a servo amplifier 60 that controls the rotation speed of the above. Further, the control unit 6 has a programmable logic control 61 (hereinafter, also referred to as PLC61) electrically connected to the servo amplifier. Then, the rotation speeds of the servomotors 2M, 3M, and 4M are controlled via the servo amplifier 60 by the command from the PLC61. That is, the PLC 61 controls the peripheral speeds V1, V2, V3 of the pair of in-feed rolls 2a, 2b, the pair of tooth groove rolls 3a, 3b, and the pair of out-feed rolls 4a, 4b.

The above is the main configuration of the manufacturing apparatus 1 used in the present embodiment. The type of the base material sheet 10 to be stretched by the manufacturing apparatus 1 is not particularly limited, and for example, paper, single-layer non-woven fabric, and the like. Examples thereof include a resin film, a laminate of two or more types of nonwoven fabric, and a laminate of a resin film and a nonwoven fabric. Specific examples of the base sheet 10 include a thermoplastic polymer non-woven fabric of polypropylene fibers, a fiber composed of a composition of polypropylene and polyethylene, and a polyolefin fiber selected from a bicomponent fiber of polypropylene and polyethylene.

Further, a nonwoven fabric containing elastic fibers is preferable from the viewpoint of imparting extensibility and flexibility to the base sheet 10 by stretching processing by the manufacturing apparatus 1. As the nonwoven fabric containing elastic fibers, an inelastic fiber layer composed of substantially inelastic fibers is arranged on at least one surface of the elastic fiber layer containing the elastic fibers, and both fiber layers are constituent fibers of the elastic fiber layer. Stretchable non-woven fabrics (hereinafter referred to as stretchable composite non-woven fabrics) joined by heat fusion while maintaining the fiber morphology, and a large number of elastic filaments arranged so as to extend in one direction without intersecting each other. Examples thereof include stretchable non-woven fabrics that are joined to stretchable non-woven fabrics over their entire length in a substantially non-stretchable state. When the base sheet 10 has elasticity, the base sheet 10 after the stretching process exhibits elasticity along the stretching direction.

As the elastic fiber, a fiber made from an elastic resin such as a styrene elastomer, a polyolefin elastomer, a thermoplastic elastomer such as a polyester elastomer or a polyurethane elastomer, or a rubber is used. Further, as the inelastic fiber, a fiber made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide or the like is used.

As the stretchable composite nonwoven fabric, various known materials can be used, for example, the stretchable sheet described in JP-A-2008-179128, the stretchable sheet described in JP-A-2007-22066, and JP-A-2007-. It is also possible to use a stretchable nonwoven fabric manufactured by the method for producing a stretchable nonwoven fabric described in Japanese Patent Application Laid-Open No. 22066, a laminated sheet described in JP-A-10-209259, and the like.

Next, the method for manufacturing the stretchable sheet of the present invention will be described by a method for continuously manufacturing the stretchable sheet 11 using the above-mentioned manufacturing apparatus 1 according to the embodiment.
In order to use the above-mentioned base sheet 10 and stretch the base sheet 10 by the manufacturing apparatus 1 shown in FIGS. 1 and 2 to obtain the desired elastic sheet 11, first, the base sheet 10 is used as a raw material. It is fed from the anti-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 original roll 10r and the peripheral speed V1 of the pair of infeed rolls 2a and 2b at the time of supplying the base sheet 10 are constant speeds (V1 = V4). Is. Then, the base sheet 10 is conveyed in the transport direction Y with the base sheet 10 sandwiched between the pair of in-feed rolls 2a and 2b, and the base sheet 10 is supplied to the meshing portions of the pair of tooth groove rolls 3a and 3b.

The supply speed of the base sheet 10 supplied to the meshing portions of the pair of tooth groove rolls 3a and 3b is higher than the speed of the stretching 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 infeed rolls 2a and 2b. The peripheral speed V1 of the pair of infeed rolls 2a and 2b is the peripheral speed of the pair of infeed rolls 2a and 2b on the outer peripheral surface. Further, the speed of the stretching process on the pair of tooth groove rolls 3a and 3b is the peripheral speed V2 at the tip of the ridge portion 30. Therefore, 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 infeed rolls 2a and 2b (V1> V2). Further, the peripheral speed V3 of the pair of outfeed rolls 4a and 4b is faster than the peripheral speed V2 of the pair of tooth groove rolls 3a and 3b. The peripheral speed V3 of the pair of outfeed rolls 4a and 4b is the peripheral speed of the pair of outfeed rolls 4a and 4b on the outer peripheral surface. Then, the draw ratio ((V2)) obtained from the speed ratio (V2 / V3) of the peripheral speed V2 and the peripheral speed V3 and the tooth groove extension degree obtained from the meshing depth of the pair of tooth groove rolls 3a and 3b. / V3) × (tooth groove elongation)) causes the substrate sheet 10 to be stretched. In this way, even if 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 infeed rolls 2a and 2b, the pair of infeed rolls 2a and 2b and the pair of tooth grooves Tension is generated in the base sheet 10 between the rolls 3a and 3b. The degree of tooth groove elongation is such that the magnification when the base sheet is stretched is multiplied by the original elongation by setting the meshing depth with respect to one base sheet and engaging the tooth groove rolls. It is a value obtained from a drawing such as CAD.

Under this state, the base sheet 10 is stretched in the transport direction Y at the meshing portions of the pair of tooth groove rolls 3a and 3b as shown in FIG. In the meshing portion, the base material sheet 10 is stretched between the convex portion 30 of one tooth groove roll 3a and the convex portion 30 of the other tooth groove roll 3b adjacent thereto. That is, the base sheet 10 is stretched. As a result, the base sheet 10 is plastically deformed and / or elastically deformed. When the base sheet 10 is plastically deformed by stretching the base sheet 10, the base sheet 10 does not return to its original length and remains in the stretched state even if the stretched state is released. On the other hand, when the base sheet 10 is elastically deformed by stretching, the base sheet 10 elastically shrinks to a state close to the original length when the stretched state is released. When the base sheet 10 is stretched and plastic deformation and elastic deformation occur at the same time, the state after the stretched state is released changes depending on 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, 4b, and the pair of outfeed rolls 4a, 4b applies tension to the base sheet 10a. Pull out from the tooth groove rolls 3a and 3b of. 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 stretched base sheet 10a can be pulled out without causing slack.

Here, when at least plastic deformation occurs due to stretching of the base sheet 10, immediately after the base sheet 10 passes through the meshing portions of the pair of tooth groove rolls 3a and 3b, for example, the pair of outfeed rolls 4a, When the base sheet 10a that has been stretched by 4b is pulled out, the base sheet 10a may break due to the breakage of the constituent fibers of the base sheet 10a. In particular, when the base sheet 10 which has been spliced with double-sided tape or the like is stretched at the meshing portion, the base is formed at the boundary portion on the downstream side in the transport direction Y with the portion where the double-sided tape is located. The material sheet 10a is likely to break. The "breakage 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 are being driven. It does not include the state where the parts are connected, such as the state where the parts are open. In the present embodiment, as shown in FIG. 2, the substrate is stretched by the fracture detection sensor 5 arranged immediately after the meshing portion of the pair of tooth groove rolls 3a and 3b in the transport direction Y of the substrate sheet 10. The presence or absence of breakage immediately after passing through the meshing portion of the sheet 10a is detected. In the present embodiment, as shown in FIG. 1, an image is taken over the entire width direction X of the base sheet 10a stretched using the image sensor 5, and the captured image data is transmitted to the control unit 6. The control unit 6 analyzes the obtained image data and detects the breakage of the base sheet 10a. For example, the obtained image data can be binarized to detect the breakage of the base sheet 10a.

When a 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 and 3b and the pair of infeed rolls 2a and 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. The "stopping 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 also, for example, the rotation to the pair of tooth groove rolls 3a, 3b. When the tooth groove rolls 3a and 3b rotate by inertia after outputting the stop instruction to the servomotor 3M, it means that the peripheral speed of the tooth groove rolls 3a and 3b becomes slow after the instruction.

In the present embodiment, when the 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 command to stop rotation 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 when the base sheet 10a is broken. The tension between the groove rolls 3a and 3b prevents the base sheet 10a from being pulled back toward the pair of infeed rolls 2a and 2b. Therefore, for example, when the base sheet 10a spliced with the double-sided tape is broken at the boundary portion of the double-sided tape, the portion where the double-sided tape is located is pulled back to the meshing portion, and the meshing portion is used. It is possible to effectively prevent the double-sided tape from sticking to one of the pair of tooth groove rolls 3a and 3b. By preventing the double-sided tape from sticking 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.

Further, when the base material sheet 10a pulled back to the pair of infeed rolls 2a and 2b by breaking is removed from the meshing portion of the pair of tooth groove rolls 3a and 3b, the convex portions 30 of the tooth groove rolls 3a and 3b are removed. There is a risk of damage due to direct contact between them, but this can also be prevented because the broken base sheet 10a is suppressed from being pulled back from the meshing portion.

Even when the base sheet 10a without paper splicing is broken, for example, the broken portion of the base sheet 10a engages with one of the pair of tooth groove rolls 3a and 3b to cause the tooth groove roll 3a. , 3b can be wrapped around and the base sheet 10a wrapped around the tooth groove rolls 3a and 3b to prevent the tooth grooves of the tooth groove rolls 3a and 3b from being damaged.

Further, in the present embodiment, the peripheral speed V1 of the pair of infeed rolls 2a and 2b is faster than the peripheral speed V2 of the pair of tooth groove rolls 3a and 3b (V1> V2). Even if the base sheet 10a is broken, the base sheet 10a is conveyed in the transport direction Y by the pair of infeed 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, it is possible to more effectively prevent the tooth grooves of the pair of tooth groove rolls 3a and 3b from being damaged.

To stop the pair of tooth groove rolls 3a and 3b, the pair of tooth groove rolls 3a and 3b rotate by inertia after outputting an instruction to stop rotation to the pair of tooth groove rolls 3a and 3b to the servomotor 3M. In this case, the peripheral speed of the pair of tooth groove rolls 3a and 3b may be slowed down after the instruction, but it is preferably after the rotation is completely stopped.

As the timing for stopping the rotation of the pair of infeed rolls 2a and 2b, for example, considering the stop time until the inertial rotation of the pair of tooth groove rolls 3a and 3b is completely stopped, the pair of tooth groove rolls 3a , 3b may be after a predetermined time has elapsed after the command to stop the rotation is output to the servomotor 3M. The predetermined time is preferably 0.1 seconds or more and 5 seconds or less, and more preferably 0.5 seconds or more and 3 seconds or less.

When the breakage of the base sheet 10a is not detected from the image captured by the image sensor 5, the base material is stretched 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 pulled out, and the stretchable sheet 11 having a desired tension applied to the base sheet 10a is continuously manufactured.

When the production of the above-mentioned elastic sheet 11 is completed, the operation of the manufacturing apparatus 1 of the elastic sheet 11 is stopped. In addition, the operation of the manufacturing apparatus 1 is also stopped when performing maintenance such as various adjustments, trouble inspection, and the like. As described above, when the operation of the manufacturing apparatus 1 is stopped without the fracture detection sensor 5 detecting the fracture of the base sheet 10a, the pair of infeed rolls 2a and 2b and the pair of tooth groove rolls 3a and 3b are arbitrarily used. Stop in order. The phrase "stopping the operation of the manufacturing apparatus 1 without detecting the breaking of the base sheet 10a by the breaking detection sensor 5" means that the manufacturing of the elastic sheet 11 is systematically stopped. It does not include stopping under unpredictable circumstances such as when the material sheet 10a breaks. 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, a command to stop rotation is output from the PLC 61 to the servomotors 2M and 3M via 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 output at the same timing. Stop at. Further, in the present embodiment, when the breakage detection sensor 5 stops the breakage of the base sheet 10a without detecting it, a command to stop rotation is output from the PLC 61 to the servomotor 4M via the servo amplifier 60 at the same timing, and a pair. The outfeed rolls 4a and 4b of the above are also stopped 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 when the breakage detection sensor 5 detects the breakage of the stretched base sheet 10a during the operation of the manufacturing apparatus 1, after the pair of tooth groove rolls 3a and 3b are stopped. Since the pair of in-feed rolls 2a and 2b are stopped, it is possible to prevent the tooth grooves of the pair of tooth groove rolls 3a and 3b from being damaged, and it is possible to efficiently manufacture the elastic sheet.

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

1 Manufacturing equipment 2a, 2b In-feed roll 2M Servo motor 3a, 3b Tooth groove roll 30 Convex part 31 Groove 3M Servo motor 4a, 4b Out-feed roll 4M Servo motor 5 Image sensor (breakage detection sensor)
6 Control unit 10 Base sheet 11 Elastic sheet

Claims (5)

The base sheet is supplied to the meshing portion of the pair of tooth groove rolls by a pair of in-feed rolls, the base sheet is stretched in the transport direction, and the stretched base sheet is stretched by the pair of out-feed rolls. A method for manufacturing a stretchable sheet, which is a method of manufacturing a stretchable sheet by pulling it out from a pair of tooth groove rolls while applying tension to the base sheet.
When a breakage detection sensor for detecting breakage of the base material sheet is arranged between the pair of tooth groove rolls and the pair of outfeed rolls, and the breakage detection sensor detects breakage during operation, Stop the pair of the tooth groove rolls and then stop the pair of the infeed rolls.
A method for manufacturing an elastic sheet, in which a pair of tooth groove rolls and a pair of infeed rolls are stopped at the same timing when the break is stopped without being detected . The method for manufacturing an elastic sheet according to claim 1 , wherein the fracture detection sensor detects the fracture of the substrate sheet immediately after passing through the meshing portion of the pair of tooth groove rolls. The method for manufacturing an elastic sheet according to claim 1 or 2 , wherein the peripheral speed of the pair of tooth groove rolls is slower than the peripheral speed of the pair of infeed rolls. The breakage detection sensor is an image sensor.
The method for manufacturing an elastic sheet according to any one of claims 1 to 3 , wherein the image sensor captures an image of the base sheet and detects breakage of the base sheet. 6 . How to make elastic sheets.

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