Rolling device

Abstract

To provide a roll device capable of suppressing formation of an air film layer during web winding and easily adjusting a touch roll.SOLUTION: The roll device comprises: a touch roll that can press the surfacer of a web wound on a wind roll; and a press roll that is provided roughly in parallel with the touch roll and that can press at least the center of the touch roll to the wind roll side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a roll device.

Background Art

[0002] In the production of film products, methods for suppressing the generation of an air film layer have been studied. The air film layer is formed by air being entrapped during the winding of the web. When the air film layer is formed, as time passes in the state where the web is wound into a roll, the air escapes and wrinkles occur, which may lead to a deterioration in quality.

[0003] As a method for suppressing the formation of the air film layer, for example, as in the roll device 1000 shown in FIG. 5, by pressing the web 103 being conveyed with a touch roll 101, the adhesion of the web 103 to the winding portion is enhanced and the amount of air entrapment is reduced. By adjusting an actuator such as a cylinder 105 provided at both ends of the touch roll 101, the touch roll 101 can press the web 103 with an appropriate pressing force.

[0004] However, in the above configuration, since the cylinder 105 is provided at both ends of the touch roll 101, the pressing force at both ends of the touch roll 101 becomes higher than that at the central portion. Therefore, it is difficult for air to escape from both ends in the width direction of the web 103, and there is a problem that air cannot be sufficiently removed.

[0005] Therefore, a method is known in which a crown roll 111 designed to have a larger diameter from both ends toward the center as shown in FIG. 5 is used as a touch roll to increase the pressing force of the touch roll on the central portion of the web 103 compared to both ends (Patent Documents 1 to 3).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] However, crown rolls have the problem of being difficult to manufacture, as the crown shape and the hardness of the rubber on the roll surface must be appropriately selected depending on the state of the trapped air. In particular, it is difficult to adjust the distribution of pressing force in the width direction of the web, and it is necessary to create and test multiple rolls with different roll shapes and rubber hardnesses. Therefore, the method of removing air with a crown roll requires time for manufacturing and testing the touch rolls, and there are also costs for purchasing rolls for testing, which is a significant burden.

[0008] Therefore, the present invention aims to provide a roll device that suppresses the formation of an air film layer during web winding and allows for easy adjustment of the contact pressure of the touch roll on the web. [Means for solving the problem]

[0009] The roll device according to the present invention includes a touch roll capable of pressing the surface of a web wound around a winding roll, and a device provided substantially parallel to the touch roll, Parts excluding both ends It is equipped with a pressing roll that can press against the winding roll side. Air cylinders are connected to both ends of the touch roll, and the pressing force of the touch roll against the web surface can be adjusted by changing the pressure of the air cylinders. ru. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a roll device that suppresses the formation of an air film layer during web winding and allows for easy adjustment of the contact pressure of the touch roll on the web. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows a schematic configuration of the area around the touch roll of the roll device according to the first embodiment. [Figure 2] A diagram illustrating the difference in contact pressure distribution with and without a pressing roll. [Figure 3] Schematic front view of the area around the touch roll of the roll device according to the second embodiment. [Figure 4] A perspective view showing the schematic configuration around the touch roll of a conventional roll device. [Figure 5] Front view showing a schematic configuration around the touch roll of a conventional roll device. [Modes for carrying out the invention]

[0012] (First Embodiment) Figure 1 is a schematic diagram showing the area around the touch roll of the roll device according to the first embodiment. More specifically, Figure 1(a) is a perspective view of the area around the touch roll of the roll device according to the first embodiment, and Figure 1(b) is a front view of the area around the touch roll of the roll device according to the first embodiment. The roll device 100 of this embodiment comprises a touch roll 1 and a pressing roll 2.

[0013] The touch roll 1 is a roughly cylindrical roll mounted on a winding roll 4 that winds the web 3 into a roll. By rotating while pressing against the surface of the web 3 (web roll) wound around the winding roll 4, it suppresses the formation of an air film layer on the wound web 3. The touch roll 1 is positioned so that its axis of rotation is parallel to the width direction of the web 3, but this may be changed as appropriate depending on the state of the air trapped in the web 3. The surface of the touch roll 1 that contacts the web 3 is made of, for example, rubber. The touch roll 1 may be a drive roll whose rotation can be controlled by a drive mechanism such as a motor, or it may be a free roll that rotates in conjunction with the transport of the web 3. However, since the touch roll 1 needs to rotate while in contact with the pressing roll 2 described later, it is preferable that it be a drive roll that can rotate in the opposite direction to the rotation direction of the pressing roll 2, considering the rotational load generated by the pressing roll 2. Air cylinders 5 are connected to both ends of the touch roll 1, and the pressing force of the touch roll 1 against the surface of the web 3 can be adjusted by changing the pressure of the air cylinders 5.

[0014] It is preferable that both ends of the touch roll 1 are located outside the widthwise ends of the web 3 (Figure 1(b)). If the ends of the touch roll 1 are located inside the widthwise ends of the web 3, winding wrinkles may occur at the point of contact between the web 3 and the ends of the touch roll 1, or the ends of the touch roll 1 may be worn down, potentially trapping foreign matter. For this reason, it is preferable that the touch roll 1 is longer than the widthwise end of the web 3.

[0015] The pressing roll 2 has a substantially cylindrical shape and is provided such that the rotation axis of the pressing roll 2 and the rotation axis of the touch roll 1 are parallel. The length of the pressing roll 2 in the longitudinal direction (the length in the rotation axis direction) is shorter than the length of the touch roll 1 in the longitudinal direction, and both ends of the pressing roll 2 are arranged inside both ends of the touch roll 1. Therefore, the central portion is strongly pressed toward the take-up roll 4 with respect to both ends of the touch roll 1, and the central portion in the width direction of the web 3 is also strongly pressed toward the take-up roll 4, and the web 3 can be wound up so as to discharge the air trapped in the web 3 from both ends in the width direction of the web 3.

[0016] Air cylinders 5 are connected to both ends of the pressing roll 2, and by changing the pressure of the air cylinders 5, the pressing force of the touch roll 1 against the surface of the web 3 can be indirectly adjusted. The pressing force is appropriately changed according to the state of the air trapped in the web 3. Since the diameter of the web roll changes according to the number of windings of the web 3, the pressure of the air cylinders 5 is also changed so that the pressing force of the touch roll 1 against the web 3 becomes constant.

[0017] Here, the distribution of the pressing force of the touch roll against the width direction of the web is compared between the roll device 1000 (FIG. 4) without the pressing roll 2 and the roll device 100 of the present embodiment provided with the pressing roll 2. FIG. 2 is a diagram for explaining the difference in the distribution of the contact pressure depending on the presence or absence of the pressing roll. The graph in FIG. 2 is obtained by sandwiching a sheet-like pressure sensor between the take-up roll and the touch roll and plotting the measured values of the pressure at a plurality of points in the width direction. In the graph shown in FIG. 2, the horizontal axis represents the position (cm) in the width direction of the web 3 (with one end of the web as the reference point), and the vertical axis represents the contact pressure (g / cm 2 ) between the touch roll and the web. The results of the roll device 1000 without the pressing roll 2 are shown by a dotted line, and the results of the roll device 100 of the present embodiment are shown by a solid line. The pressure applied to both ends of the touch roll 1 is the same between the roll device 1000 and the roll device 100.

[0018] As shown in Fig. 2, in the roll device 1000 without the pressing roll 2, the contact pressures at both ends in the width direction of the web 103 are higher than those at the central portion. Therefore, air cannot be sufficiently discharged, and there is a risk of forming an air film layer.

[0019] On the other hand, in the roll device 100 of the present embodiment, the contact pressure on the central side is higher than that at both ends in the width direction. Therefore, the entrapped air can be efficiently discharged, and the formation of the air film layer can be suppressed.

[0020] As described above, in the present embodiment, the pressing roll 2 capable of pressing the portion of the touch roll 1 except both ends toward the take-up roll 4 side is provided. As a result, the portion of the web 3 except both ends is strongly pressed toward the take-up roll 4 side, and the web 3 can be wound while discharging the air entrapped in the web 3 from both ends in the width direction of the web 3. Therefore, the generation of the air film layer during winding of the web 3 can be suppressed.

[0021] In addition, a cylindrical roll is used as the touch roll 1. Therefore, there is no need to adopt a crown-shaped roll as the touch roll 1 for the purpose of suppressing the generation of the air film layer as in the prior art, and the design and adjustment of the touch roll 1 are easy.

[0022] In addition, the pressing force of the touch roll 1 and the distribution of the pressing force with respect to the width direction of the web 3 can be easily adjusted by changing the pressing force of the pressing roll 2 via the air cylinder 5. Therefore, it is not necessary to change the design of the touch roll 1 itself when adjusting the pressing force on the web 3.

[0023] (Second Embodiment) The roll device 200 according to the second embodiment will be described focusing on the differences from the first embodiment. Fig. 3 is a schematic front view around the touch roll of the roll device according to the second embodiment.

[0024] This embodiment is characterized by the provision of multiple contact rolls 2. An air cylinder 5 is connected to each contact roll 2. Therefore, the pressing force of each contact roll 2 against the surface of the web 3 can be adjusted independently. For example, by relatively increasing the pressing force of the contact roll 2 pressing the center of the touch roll 1, the trapped air can be efficiently discharged. Furthermore, compared to the case where there is only one contact roll 1 as in the first embodiment, the contact pressure can be adjusted more precisely according to the characteristics of the touch roll and the amount of air trapped. The rotation axes of the multiple contact rolls 2 are arranged so that their rotation axes coincide. [Industrial applicability]

[0025] This invention can be used as a roll device that suppresses the formation of an air film layer during web winding. [Explanation of Symbols]

[0026] 1 Touch Roll 2 Pressing Roll 3 Web 4. Winding Roll 5 cylinders 100, 200, 1000 roll machine

Claims

1. A touch roll capable of pressing the surface of the web being wound onto the winding roll, The system includes a pressing roll provided substantially parallel to the touch roll, which can press the portion of the touch roll excluding both ends toward the winding roll, A roll device in which air cylinders are connected to both ends of the pressing roll, and the pressing force of the touch roll against the surface of the web can be adjusted by changing the pressure of the air cylinders.

2. The roll device according to claim 1, wherein air cylinders are connected to both ends of the touch roll.

3. The roll device according to claim 1, further comprising a drive mechanism capable of rotating the touch roll in the opposite direction to the rotation direction of the pressing roll.

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