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:
Dec. 25, 2018
Filed:
Nov. 13, 2014
Applicant:
Zeon Corporation, Tokyo, JP;
Inventor:
Takao Kobayashi, Tokyo, JP;
Assignee:
ZEON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C 55/10 (2006.01); B29D 11/00 (2006.01); G02B 5/30 (2006.01); G02F 1/1335 (2006.01); B29C 55/14 (2006.01); B29L 11/00 (2006.01); B29C 55/06 (2006.01); B29C 55/16 (2006.01);
U.S. Cl.
CPC ...
B29C 55/10 (2013.01); B29C 55/14 (2013.01); B29D 11/00644 (2013.01); G02B 5/3025 (2013.01); G02B 5/3033 (2013.01); G02F 1/133528 (2013.01); B29C 55/065 (2013.01); B29C 55/16 (2013.01); B29D 11/00788 (2013.01); B29L 2011/00 (2013.01);
Abstract
The present invention provides a method for producing a stretched film, the method including: (a) a first step of stretching a long-length pre-stretch film in a diagonal direction at a stretch ratio B1 to obtain a long-length intermediate film; and after the first step, (b) a second step of performing free uniaxial stretching of the intermediate film in a flow direction at a stretch ratio B2 while continuously conveying the intermediate film to obtain a long-length stretched film, wherein the stretch ratios satisfy B1>B2.