Method for manufacturing optical film

Details Method for manufacturing optical film Method for manufacturing optical film

2007-04-02

2010-06-01

Del Sole, Joseph S (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

C264S001600, C264S212000, C425S223000, C425S224000

Reexamination Certificate

active

07727445

ABSTRACT:
A method for manufacturing an optical film comprising the steps of: 1) casting a dope (a solution), prepared by dissolving thermoplastic resin film raw materials in a solvent, from a casting die onto an at least 1.8 m wide belt support, and 2) drying a cast web (a cast film) peeled from the belt support, wherein the belt support has a thickness (Te) at both right and left end portions, of 5-20% less than a thickness (T) of the remaining portion including the transverse center portion of the belt support, provided that the Te indicates a thickness at both right and left end portions, each having a width (We) of 2-25% of a total width (W) of the belt support when viewed from both right and left side edges thereof.

REFERENCES:
patent: 3111715 (1963-11-01), Hofer
patent: 2006/0071363 (2006-04-01), Okutsu et al.
patent: 2007/0085235 (2007-04-01), Boyle et al.
patent: 51-137466 (1976-11-01), None
patent: 57-156219 (1982-09-01), None
patent: 2002-127169 (2002-05-01), None
patent: 2002-234042 (2002-08-01), None
patent: 2005-111669 (2005-04-01), None

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