Patent ID: 9144935
Filing Date: 2015-09-29
Classification: B29C,B29K,B32B

Abstract:
1. A method for producing a stretched film, comprising conveying a continuously fed film in a conveying direction while pinching both side edges of the film with holding members, and a stretching step comprising stretching the film in a direction transverse to the conveying direction while increasing a distance between the holding members of both the side edges while conveying the film, and a sagging step wherein a partial area or a whole area of the film is sagged by pinching the film between pinching members having projections and recesses, so as to generate a sagged film having ridges and grooves extending longitudinally in a direction perpendicular to the conveying direction, and the film is stretched in the traverse direction while the film is sagged in the conveying direction, wherein at least a portion of the film is instantaneously sagged by the sagging step and stretched by the stretching step.