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:
Feb. 15, 2005
Filed:
Apr. 02, 2002
Seiji Kondo, Ibaraki, JP;
Kazuki Tsuchimoto, Ibaraki, JP;
Akihiro Nishida, Ibaraki, JP;
Ryouji Kinoshita, Ibaraki, JP;
Seiji Kondo, Ibaraki, JP;
Kazuki Tsuchimoto, Ibaraki, JP;
Akihiro Nishida, Ibaraki, JP;
Ryouji Kinoshita, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki, JP;
Abstract
An oriented film of polyvinyl alcohol derived film with reduced stretch irregularity and uniform orientation in a wide range of a stretching ratio is obtained by a manufacturing method for an oriented film, comprising the steps of: contacting a non-stretched film, comprising polyvinyl alcohols or derivatives thereof, with moisture percentage adjusted to no more than 10%, to at least one heating roll currently driven and heating the film at no less than 70° C.; subsequently giving a tension and stretching using a peripheral velocity difference between the heating roll concerned and a stretch roll in a position ahead of said heating roll in a running direction of the film.