Manufacturing method for long webs

Abstract

To provide a manufacturing method of a long web capable of determining whether a rotation direction of a rotary roll is correct or incorrect by a simple method.SOLUTION: A manufacturing method of a long web having a step of conveying the long web along a plurality of rotary rolls, wherein the step of conveying the long web includes performing determination by using a conveyance device including: a marking part for identifying a rotation direction of the rotary roll; a detection part for detecting the marking part and identifying the rotation direction of the rotary roll; identification information detected by the detection part; and a determination part for determining whether the rotation direction of the rotary roll is correct or incorrect, the marking part has a first sub-marking part and a second sub-marking part whose detection amount by the detection part is different from the first sub-marking part, the identification information detected by the detection part is arranged to be different due to a difference in the rotation direction of the rotary roll.SELECTED DRAWING: Figure 1

Claims

1. A method for manufacturing a long web, comprising the step of conveying the long web along multiple rotating rolls, The process of transporting the long web is as follows: The plurality of rotating rolls, A marking portion is provided on at least one rotating roll for identifying the direction of rotation of the rotating roll, A detection unit that detects the marking portion and identifies the rotation direction of the rotating roll, The transfer device includes a determination unit that determines whether the rotation direction of the rotating roll is correct or incorrect by comparing the identification information detected by the detection unit with pre-set reference information for the correct rotation direction of the rotating roll, and the determination is performed using the transfer device. The marking unit has a first sub-marking unit and a second sub-marking unit which has a different detection amount from the first sub-marking unit. The first sub-marking section and the second sub-marking section are arranged such that the identification information detected by the detection section differs depending on the rotation direction of the rotating roll. A method for manufacturing a long web, comprising the steps of: confirming that the long web was supplied to the conveying surface of the rotating roll in line with the design conveying direction if the rotation direction of the rotating roll is determined to be "correct" in the determination unit; and confirming that the long web was supplied to the surface of the rotating roll opposite to the conveying surface in line with the design conveying direction, and that it was conveyed in a conveying direction deviating from the design conveying direction, if the rotation direction of the rotating roll is determined to be "incorrect".

2. The method for manufacturing a long web according to claim 1, wherein, when the rotating roll is viewed from the side, the angle between the line connecting the center of the first sub-marking portion and the center of the rotating roll and the line connecting the center of the second sub-marking portion and the center of the rotating roll is greater than 0° and less than 180°.

3. The method for manufacturing a long web according to claim 1 or 2, wherein the marking portion is arranged on the side surface of the rotating roll.

4. A method for manufacturing a long web according to any one of claims 1 to 3, wherein the marking portion has the property of absorbing infrared rays, and the detection portion is an infrared sensor.

5. A method for manufacturing a long web according to any one of claims 1 to 4, wherein the first sub-marking portion and the second sub-marking portion have different lengths in the circumferential direction of rotation of the rotating roll.

6. The method for manufacturing a long web according to any one of claims 1 to 5, wherein the detection unit obtains a ratio based on the detection amount of the first sub-marking unit and the detection amount of the second sub-marking unit as the identification information.

7. A method for manufacturing a long web according to any one of claims 1 to 6, wherein the determination unit makes a determination multiple times regarding the correctness of the rotation direction of the rotating roll, and then makes a final determination.

8. The method for manufacturing a long web according to any one of claims 1 to 7, wherein the rotating roll is a free roll.

9. The method for manufacturing a long web according to any one of claims 1 to 8, wherein the long web is a long film.

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