JP2013151360A - Winding method and winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web winding method and a device configured to prevent a defect such as a flaw or a winding shift in high-speed conveyance when winding a continuously traveling web in a winding roll form so that a winding roll having good quality is stably obtained.SOLUTION: A winding method includes: a winding step of winding a web by a winding roll; a depressurization step of depressurizing a space formed by the winding roll and a web immediately before being wound and a space adjacent thereto by a depressurization mechanism; a measurement step of measuring a winding diameter of the winding roll; and a depressurization mechanism arrangement step of arranging a suction port of the depressurization mechanism always at a position closest to a winding point where the web comes into contact with the winding roll in a range not interfering with the web or the winding roll on the basis of the data of the winding diameter of the winding roll obtained from the measurement step. The winding step, the depressurization step, the measurement step, and the depressurization mechanism arrangement step are simultaneously performed.

Description

  The present invention relates to a winding method and a winding apparatus capable of winding a web without misalignment and producing a winding roll of good winding quality.

  The web winding technology is a technology for winding a thin continuous web into a roll, and is widely used in various products such as papers and plastic films. In particular, the web-winding technology for plastic films is a technology that has attracted attention as the optical field and the electronics field have been developed.

  In recent years, a technique for conveying a plastic film at high speed has been demanded along with cost reduction and further product quality improvement. However, in a winding method in which a continuously running web is wound on a winding roll at a high speed, a winding shift called a telescope occurs due to factors such as an air entrainment phenomenon, and a winding roll having a good winding quality is generated. There are many cases that cannot be obtained.

  Generally, in order to suppress winding deviation, a free roll called a nip roll is pressed near the winding roll and the winding point where the web is in contact with the winding roll to suppress the amount of entrained air and limit the entrained air Method is used. However, in such a system in which the nip roll is pressed, the roll comes into contact with the coated surface, so that a good winding quality can be obtained, but the coated surface may be scratched to cause a defect in the product.

  For example, Patent Document 1 and Patent Document 2 disclose a technique for preventing entrained air and winding a web without scratches and winding deviations.

  In Patent Document 1, there is an injection means for injecting air in a direction opposite to the web between the winding roll and the web to be wound, and air entrainment suppresses intrusion of entrained air, and the winding point is negative. By using the pressure, it is possible to prevent a decrease in the frictional force between the web layers due to air entrainment between the web layers, and to suppress the occurrence of scratches due to winding misalignment and touch rolls.

  However, in the method of Patent Document 1, since air injection is only in the direction opposite to the web traveling direction, it is impossible to prevent entrained air that enters from both sides of the winding point. In addition, in order to inject air in the direction opposite to the winding point to obtain a negative pressure, a considerable amount of air is required, and practicality is poor.

  In Patent Document 2, air is jetted from the outer side of the winding roll toward the outer surface of the web, and the blown air is sucked in by the decompression device while pressing the web against the winding roll, so Prevents entry between web layers.

  However, in the method of Patent Document 2, the jet air is collected by the pressure reducing device, but since the pressure reducing device is fixed and cannot move, the pressure is reduced at the optimum position while following the winding point that changes depending on the winding diameter. It is difficult to prevent blast air from entering.

JP-A-2005-35734 JP 2009-280384 A

  An object of the present invention is made by paying attention to such problems, and when winding a continuously running web into a take-up roll, it is intended to suppress defects such as scratches and winding deviation in high-speed conveyance. Another object of the present invention is to provide a web winding method and apparatus that makes it possible to stably obtain a winding roll having a good winding quality.

As means for solving the above problems, the invention described in claim 1 is a winding method for winding a continuously running web on a winding roll, and at least,
A winding process for winding the web by a winding roll;
A decompression step of decompressing the space sandwiched between the winding roll and the web by a decompression mechanism;
A measuring step for measuring the winding diameter of the winding roll;
Based on the winding diameter data obtained from the measurement step, the position of the suction port of the pressure reducing mechanism is always the closest position to the winding point where the web contacts the winding roll within a range that does not interfere with the web or winding roll. And a decompression mechanism placement step to be placed in
The winding method is characterized in that the winding step, the pressure reducing step, the measuring step, and the pressure reducing mechanism arranging step are performed simultaneously.

  According to a second aspect of the present invention, in the space between the winding roll and the web, the depressurization step is performed by the depressurization mechanisms provided in multiple stages in the web flow direction. This is a winding method.

Invention of Claim 3 is a winding apparatus which winds the web which runs continuously on a winding roll, Comprising: At least,
A winding roll for winding the web;
A decompression mechanism for decompressing the space sandwiched between the winding roll and the web;
A displacement sensor for measuring the winding diameter of the winding roll that changes momentarily as the web is wound;
Based on the data measured by the displacement sensor, the suction port of the pressure reducing mechanism is disposed at a position closest to the winding point where the web contacts the winding roll within a range not interfering with the web or the winding roll. And a depressurizing mechanism arranging mechanism.

  The invention described in claim 4 is characterized in that a pressure reducing mechanism is provided in multiple stages in the flow direction of the web in a space adjacent to the space sandwiched between the winding roll and the web. It is a winding device.

  According to the manufacturing method described in claim 1, the suction port of the pressure reducing mechanism can always be disposed at a position closest to the winding point where the web contacts the winding roll, and according to the winding diameter of the winding roll. Since the winding point is sucked at the optimum position, air entrained by the web can be accurately suppressed from being wound between the web layers. Further, since air is sucked at the time of winding, foreign matters on the web can be sucked and removed, and since there is no contact with the near roll, generation of scratches on the web can be prevented. Therefore, in the web winding at the time of high-speed conveyance, it is possible to stably obtain a winding roll having a good winding quality free from winding deviation and scratches.

  According to the manufacturing apparatus described in claim 2, the web has the pressure reducing mechanism that can move the suction port of the reduced pressure in the vicinity of the winding point where the web is in contact with the winding roll, and is optimal according to the winding diameter of the winding roll. Since the winding point is sucked at the position, air entrained by the web can be accurately suppressed from being wound between the web layers. Further, since air is sucked at the time of winding, foreign matters on the web can be sucked and removed, and since there is no contact with the near roll, generation of scratches on the web can be prevented. Therefore, in the web winding at the time of high-speed conveyance, it is possible to stably obtain a winding roll having a good winding quality free from winding deviation and scratches.

  According to the manufacturing method described in claim 3, in the space between the winding roll and the web running toward the winding roll, the pressure reducing mechanisms for sucking air are installed in multiple stages, Accompanied air can be sucked in steps by the upstream pressure reducing mechanism of the take-up roll, and even when the accompanying air cannot be removed only by the downstream pressure reducing mechanism, it is possible to cope. Therefore, a high-quality winding roll having no winding deviation can be stably obtained in web winding during high-speed conveyance.

  According to the manufacturing apparatus of the fourth aspect, the pressure reducing mechanism for sucking air is installed in multiple stages in the space between the winding roll and the web that is running toward the winding roll. Accompanied air can be sucked in steps by the upstream pressure reducing mechanism of the take-up roll, and even when the accompanying air cannot be removed only by the downstream pressure reducing mechanism, it is possible to cope. Therefore, a high-quality winding roll having no winding deviation can be stably obtained in web winding during high-speed conveyance.

Schematic side view showing an example of the winding device of the present invention It is a typical side view explaining the relationship between the winding roll of the winding apparatus of this invention, and a downstream pressure reduction mechanism, (a) is an example in case the winding diameter of a winding roll is small, (b) is a winding roll. (C) has shown the example in case the winding diameter of a winding roll is large, respectively.

  Hereinafter, a web winding device having a winding deviation prevention mechanism according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic side view showing an example of the winding device of the present invention, and shows an example in which the decompression mechanism is composed of a downstream decompression mechanism 4 and an upstream decompression mechanism 5.
2 (a), (b), and (c) are shown in FIG. 1 except for the upstream pressure reducing mechanism 5, and the winding diameter of the winding roll is (a), (b), (c). It is the schematic which shows the example of a structure of the winding apparatus of the web at the time of becoming large in order. The example of the situation where the position of the downstream pressure reducing mechanism 4 is always arranged close to the winding point P even when the winding diameter is increased from a small time is shown.

  In this winding device, a core 9 is connected to the drive shaft 2, and the web 3 can be hung on the core 9 with a tape or the like. The core 9 has an effective width longer than the width of the web 3, and the web 9 that is hung can be wound at a constant speed by rotating clockwise in FIG. 1.

  A downstream pressure reducing mechanism 4 is disposed in the vicinity of the winding contact point between the winding roll 1 and the web 3, that is, the winding point P. The downstream decompression mechanism 4 is connected to a decompression line following the decompression blower 10 and draws air from the decompression line to form a decompressed state. The suction port 6 of the downstream pressure reducing mechanism 4 is controlled to move to a position to be arranged according to the winding diameter so as to be always close to the winding point P. As shown in FIGS. 2A, 2B, and 2C, the position of the winding point P increases as the winding diameter increases in the order of FIGS. 2A, 2B, and 2C. Is changed so that the suction port 6 of the downstream pressure reducing mechanism 4 with respect to the winding point P can be disposed at the closest position within a range that does not interfere with the web 3 and the winding roll 1. The pressure is reduced while moving 4. At this time, since the angle at which the web 3 is wound also changes, the inclination angle of the suction port 6 is controlled so as not to interfere with the web 3 and the winding roll 1 in accordance with the change in the winding diameter. A motor or the like is used for the drive system, and the measurement of the winding diameter is performed using a displacement sensor 8 attached above the winding roll 1. Further, since the suction port 6 of the downstream pressure reducing mechanism 4 is as close as possible to the winding point P, it has an elongated tip shape within a range in which the suction air volume can be secured.

  An upstream decompression mechanism 5 is provided further upstream from the downstream decompression mechanism 4. The upstream decompression mechanism 5 has a suction port 6 ′ wider than the suction port 6 of the downstream decompression mechanism 4, and is responsible for roughing before the downstream decompression mechanism 4. The decompression mechanism has an effective width wider than that of the web on both the downstream side and the upstream side, and can also entrain the accompanying air 7 entering from the side as well as on the web.

Next, the operation of the web winding device having this winding deviation prevention mechanism will be described.

  Under the state where the web 3 is hooked on the core 9, the core 9 rotates together with the drive shaft 2 and the winding of the web 3 starts. The accompanying air 7 is first roughly sucked by the upstream decompression mechanism 5. Thereafter, the downstream pressure reducing mechanism 4 sucks air in the vicinity of the winding point P, which is a contact point between the winding roll 1 and the web 3, and winds the web 3 while removing the accompanying air 7.

  When winding the web 3, the downstream pressure reducing mechanism 4 is provided with a mechanism that follows the change in the position of the winding point P that changes as the winding diameter increases, so that the winding diameter increases. However, the entrained air 7 from the winding point P can be sucked accurately, and air entrainment into the winding roll 1 can be suppressed. Moreover, the foreign material on the web 3 can also be removed by suction of air by the decompression mechanism.

  When the amount of the accompanying air 7 increases due to the line speed change, the accompanying air 7 can be prevented from entering by adjusting the suction amount of the upstream decompressing mechanism 5 and the downstream decompressing mechanism 4. By the above method, air winding between the wound web layers can be stably prevented during winding during high-speed conveyance, and the winding roll 1 free from winding deviation and scratches can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Winding roll 2 ... Drive shaft 3 ... Web 4 ... Downstream pressure reduction mechanism 5 ... Upstream pressure reduction mechanism 6, 6 '... Suction port 7 ... Entrained air 8 ... Displacement sensor 9 ... Core 10 ... Pressure reduction blower P ... Winding up point

Claims (4)

A winding method for winding a continuously running web on a winding roll, at least,
A winding process for winding the web by a winding roll;
A decompression step of decompressing the space sandwiched between the winding roll and the web by a decompression mechanism;
A measuring step for measuring the winding diameter of the winding roll;
Based on the winding diameter data obtained from the measurement step, the position of the suction port of the pressure reducing mechanism is always the closest position to the winding point where the web contacts the winding roll within a range that does not interfere with the web or winding roll. And a decompression mechanism placement step to be placed in
The winding method, wherein the winding step, the pressure reducing step, the measuring step, and the pressure reducing mechanism arranging step are performed simultaneously.   The winding method according to claim 1, wherein in the space sandwiched between the winding roll and the web, the decompression step is performed by a decompression mechanism provided in multiple stages in the flow direction of the web. A winding device for winding a continuously running web on a winding roll, at least,
A winding roll for winding the web;
A decompression mechanism for decompressing the space sandwiched between the winding roll and the web;
A displacement sensor for measuring the winding diameter of the winding roll that changes momentarily as the web is wound;
Based on the data measured by the displacement sensor, the suction port of the pressure reducing mechanism is disposed at a position closest to the winding point where the web contacts the winding roll within a range not interfering with the web or the winding roll. And a decompression mechanism arrangement mechanism.   The winding device according to claim 3, wherein a pressure reducing mechanism is provided in multiple stages in the flow direction of the web in a space adjacent to a space sandwiched between the winding roll and the web.

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