The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 1976
Filed:
Jul. 24, 1974
Sanyo-Kokusaku Pulp Co., Ltd., Tokyo, JA;
Abstract
A method for producing a synthetic crystalline thermoplastic resin film suitable for stretching without necking including adding 5 to 300 parts by weight of a filler to 100 parts of a synthetic crystalline thermoplastic resin film such as polyethylene on isotactic polypropylene having a degree of crystallization of more than 60%, pressing the film against a rigid blade having a radius of curvature of 0.01 to 1.0 millimeter, bending the film around the blade using the blade as a fulcrum to a bending angle between 20.degree. and 170.degree., moving the film relative to the blade while keeping the bending angle constant thereby whitening the film, said whitening of the film being conducted without positively heating or stretching the film, and stretching the film after whitening at a draw ratio below the natural draw ratio of the film.