JP2001072291A - Conveying roller and long material conveying method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveying roller not affected by the environmental condition such as a temperature or the like, and capable of dispensing with the accuracy in rolling work and mounting, and preventing the wrinkling on the conveyed paper with low cost and small efforts by making surfaces of both ends of a conveying roller out of a material having a small coefficient of friction in comparison with that of a surface of its central part. SOLUTION: This conveying roller 1 has the different coefficients of friction between both end surfaces 2a, 2b and a central surface 3. The wrinkling is easily produced on both ends in the width direction of a long material when the long material such as the paper to be conveyed, made of a thin, soft and wide resin film or the like is conveyed. To eliminate the wrinkling and to make both ends of the long material slippery, a coefficient of friction of both end surfaces 2a, 2b of the conveying roller 1 is relatively lowered in comparison with that of a central surface 3, for example, with the difference of approximately 0.1. Both end surfaces 2a, 2b are made of, for example, rubber, and the central surface 3 is made of, for example, stainless. Whereby the long material can be easily and surely prevented from being wrinkled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveying method for processing a web-like film or sheet (hereinafter, these are collectively referred to as a long object) by a roll-to-roll method or a stepping roll method. The present invention relates to a method of transporting a thin and flexible resin-made long object without bending or wrinkling.

[0002]

2. Description of the Related Art Normally, when performing processing such as printing, painting, laminating, or the like on a long material wound into a roll,
It is necessary to apply a constant tension along the conveying direction of the long object unwound from the roll in order to prevent processing and to prevent the web from meandering.

Therefore, when such a long object is conveyed, wrinkles are generated along the end of the long object or along the conveying direction of the long object. Or a defect such as breakage may occur in a long object after processing.

[0004] As a countermeasure, there is known a means for suppressing the occurrence of wrinkles by improving the processing accuracy of parts related to conveyance and the mounting accuracy thereof. This method is effective for a long object having a relatively narrow width. However, when the width of the long object is increased, another method is required to prevent the occurrence of wrinkles.

For example, a long object is wound around a curved roll that curves the surface of a roll contacting the long object, or a long object is wound around a grooved roll that spirally forms a groove on the surface that comes into contact with the long object. There is known a means for applying a widening force, which is a tension in a width direction of a long object orthogonal to a conveying direction of the long object, to the long object.

There is also known a cross guider which sandwiches both ends of a long object with a pair of rolls operated by, for example, an air cylinder and pulls the long object to both ends to apply a widening force.

[0007] For example, Japanese Patent Application Laid-Open No. 5-278914 proposes a cross guider to which meandering of a long object is added.

In addition, Japanese Utility Model Laid-Open Publication No. 5-85654 proposes a method of preventing wrinkling by using a roll having a rubber foot for applying a tension in the width direction on the downstream side of a long object. I don't know!

[0009]

As described above, wrinkle prevention measures for improving accuracy have a limit in improving accuracy.
In addition, depending on environmental conditions such as temperature, warping, elongation,
Since conditions such as hardness change, it is difficult to reliably eliminate wrinkles in practice. In addition, as mentioned above, to increase the processing accuracy of the roll and the mounting accuracy of the roll,
There is a problem that the cost of parts is increased and productivity is reduced.

[0010] Further, when a device and a special roll for generating tension on the long object are installed along the width direction of the long object which is a direction orthogonal to the conveying direction, cost and labor are required. .

Provided is a wrinkle prevention mechanism that can prevent wrinkles from occurring at low cost and with low labor without being affected by environmental conditions such as temperature, and without requiring high roll processing accuracy and mounting accuracy. For the purpose.

[0012]

According to a first aspect of the present invention, there is provided a transport roll characterized in that the transport roll is made of a different material having a small coefficient of friction with respect to the surface of the central portion.

According to a second aspect of the present invention, there is provided the transport roll according to the first aspect, wherein the surfaces of the both ends are made of a material having a smaller coefficient of friction than the surface of the central portion.

According to a third aspect of the present invention, there is provided the transport roll according to the first aspect, wherein both end surfaces are made of a material having a higher coefficient of friction than the center surface.

According to a fourth aspect of the present invention, there is provided a long object wherein the conveying roll according to any one of the first to third aspects is arranged on a conveying path of the long object processed by a roll-to-roll method or a stepping roll method. Is a transport method.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a transport roll according to the present invention.

The transport roll 1 has a structure in which both end surfaces 2a and 2b and a central surface 3 have surfaces having different friction coefficients.

Wide width (typically 65
When the mechanical accuracy of the roll is low, as shown in FIG. 2, when the roll has low mechanical accuracy, the roll ends may have a large effect. The wrinkles that occur when the end of the long object 4 is shifted toward the center from the center are problematic.

Further, as shown in FIG. 3, even when the mechanical accuracy of the roll is high, there is a problem in that the long object 4 is wrinkled near the center when viewed from the width direction.

In order to solve the above-mentioned problem, it is necessary to make the long object 4 in contact with both end surfaces of the roll slippery. It is desirable to make it smaller than the coefficient of friction.

In order to solve the problem described later, it is necessary to make the long object 4 in contact with the both end surfaces of the roll less slippery. It is desirable to make it larger than the coefficient. If the difference between the two friction coefficients is about 0.1, the intended purpose is achieved.

The combination of the materials 2a, 2b and 3 includes a combination of 2a and 2b with rubber and 3 with stainless steel, or a combination of 2a and 2b with stainless steel and 3 with rubber, but is not limited thereto. Instead, it can be achieved, for example, by applying an antifouling agent or the like to a part of the side surface of the stainless steel roll in order to have a difference in friction coefficient. It can also be achieved by winding a tape around both ends or the center of a stainless steel roll.

FIG. 4 is a perspective view showing a main part in a state where the transport roll 1 is arranged on a transport path of a film processed by a roll-to-roll method or a stepping roll method.

By appropriately setting the configuration of the transport roll according to the type (material, width) of the film and the processing conditions, wrinkling of the film during transport can be prevented.

[0026]

According to the present invention, there is no need to install a device for applying tension to a long object and a special roll, and a mechanism for preventing the occurrence of wrinkles in a long object conveyed at low cost and with low labor. Is provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a transport roll according to the present invention.

FIG. 2 is a perspective view showing an example of wrinkles generated on a long object.

FIG. 3 is a perspective view showing another example of wrinkles generated in a long object.

FIG. 4 is a perspective view showing a main part in a state where the transport roll of the present invention is arranged on a transport path of a long object.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Conveyance roll 2a, 2b ... Roll both end surface 3 ... Roll central part surface 4 ... Long object

Claims (4)

[Claims] 1. A transport roll wherein the surfaces of both ends are made of a different material having a smaller coefficient of friction than the surface of the central portion. 2. A transport roll according to claim 1, wherein the surfaces of both ends are made of a material having a smaller coefficient of friction than the surface of the central portion. 3. The transport roll according to claim 1, wherein the surfaces of both ends are made of a material having a higher friction coefficient than the surface of the central portion. 4. The method according to claim 1, wherein the transport path of the long object processed by the roll-to-roll method or the stepping roll method is provided.
3. A method for transporting a long object, wherein the transport roll according to any one of 3) is arranged.