METHOD FOR PRODUCING LONG STRETCHED FILM

摘要

A method for producing a long stretched film according to one aspect of the present invention includes at least a step of forming a long film, a step of obliquely stretching the long film and a step of winding the long stretched film. A winding direction of the long stretched film can be arbitrarily changed to a direction oblique to a delivering direction of the long film. In the oblique stretching step, grip release points of gripping tools gripping opposite end parts of the long stretched film are independently movable in the winding direction of the long stretched film and so adjusted that a grip release line connecting the grip release points on respective opposite sides becomes parallel to the width direction of the long stretched film.

主权项

1. A method for producing a long stretched film, comprising at least a step of forming a long film made of thermoplastic resin, an oblique stretching step of delivering the long film in a specific direction different from a winding direction of the film after stretching and obliquely stretching the long film in a direction of an angle exceeding 0° and below 90° with respect to a width direction of the long film while gripping and conveying opposite end parts of the long film by gripping tools of an oblique stretching device and a step of winding the long stretched film after the oblique stretching step, wherein:
the oblique stretching device is capable of arbitrarily changing a stretching direction so that the winding direction of the long stretched film is oblique to a delivering direction of the long film; and in the oblique stretching step, grip release points of the gripping tools gripping the opposite end parts of the long stretched film are independently movable in the winding direction of the long stretched film, and the grip release points are so adjusted that a grip release line connecting the grip release points on the opposite end parts becomes parallel to the width direction of the long stretched film.