Method and device for manufacturing biaxial extending ribbon and device for bending ribbon

Abstract

The invention provides a biaxial extension strip-like article manufacturing method, manufacturing device and strip-like article retracting device. The inventive biaxial extension strip-like article manufacturing method is not needed to reset the controlling parameters and the like of a calendaring forming apparatus and a longitudinal extension apparatus and the like, even if the mode of enlarging the extension magnification of the transverse extension apparatus changes. In a first extension process of the manufacturing method, a first extension strip-like article is produced by extending the non extension strip-like article in its length direction. In a retracting process, an end or two ends at the width directional of the first extension strip-like article retracts one time or multiple times, to produce a first extension strip-like article with scheduled width, namely a first extension strip-like article with variable width. In a second extension process, part or whole of the retracting part of the first extension strip-like article with variable width is held, the first extension strip-like article with variable width is made to extend in the width direction for producing a second extension strip-like article.

Description

technical field [0001] The invention relates to a manufacturing method of a biaxially stretched strip, a strip turning device and a biaxially stretched strip manufacturing device. Background technique [0002] Conventionally, there are known a first stretching device (such as a roller stretching device) that stretches an unstretched strip in the longitudinal direction, and a strip that is stretched in the longitudinal direction by the first stretching device (hereinafter referred to as "the second stretching device"). A stretching belt") is a biaxial stretching device (for example, refer to Patent Document 1) composed of a second stretching device (such as a tenter device, etc.) extending in the width direction. [0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2002-67141 [0004] However, in general, in the second stretching device typified by a tenter or the like, there is a limit in the stretching width. Therefore, there are cases where the operato...

AI Technical Summary

Problems solved by technology

However, when the strip is made of, for example, polytetrafluoroethylene (hereinafter referred to as "PTFE"), fine powder of PTFE may adhere to the cutting blade over time, resulting in poor cutting. Therefore, this method Not yet practical

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