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:
Apr. 24, 2018
Filed:
Oct. 29, 2014
Zeon Corporation, Tokyo, JP;
Masaru Kikukawa, Tokyo, JP;
ZEON CORPORATION, Tokyo, JP;
Abstract
A method for manufacturing a stretched film for producing a long-length stretched film by stretching a long-length resin film while being conveyed so as to pass through an oven in a state in which the end portions of the resin film are held by first and second grippers, wherein the oven has a preliminary heating zone, a stretching zone, a thermal fixing zone, and a reheating zone in this order from an upstream side; the stretching zone includes a specific zone having a temperature gradient capable of setting a temperature of an end portion on a second gripper side is higher than a temperature of an end portion on a first gripper side by 5° C. or higher and 15° C. or lower; and the reheating zone has a temperature capable of heating the resin film to a temperature of Tg+5° C. or higher and Tg+20° C. or lower.