Title:
METHOD FOR PRODUCING FILM
Document Type and Number:
WIPO Patent Application WO/2011/148835
Kind Code:
A1
Abstract:
Provided is a method for producing a film with an excellent conveyance property wherein variations in optical value and occurrence of foreign matter bright spots are sufficiently prevented at the end of the film. The method for producing the film comprises: a casting step for casting a solution produced by dissolving at least a polymeric material in a solvent on a support; a solvent evaporation step for evaporating the solvent from the cast solution on the support to form a film; a peeling step for peeling the film from the support; and a drawing step for introducing the film into a tenter and drawing the film at least in the width direction while conveying the film. Said method for producing the film is characterized in that the length (W1) in the width direction of the film when the film is grasped and the length (W2) in the width direction of the film when the film is introduced into the tenter satisfy a relational expression: 0.97≤W2/W1≤1.03, and the temperature (T1) of a grasping tool when the film is grasped and the temperature (T2) of the end of the film when the film is grasped satisfy a relational expression: 0≤T1-T2≤100.
Inventors:
TANAKA Hirofumi (Inc. 2970, Ishikawa-machi, Hachioji-sh, Tokyo 05, 〒1928505, JP)
Application Number:
JP2011/061398
Publication Date:
December 01, 2011
Filing Date:
May 18, 2011
Export Citation:
Assignee:
KONICA MINOLTA OPTO, INC. (2970, Ishikawa-machi Hachioji-sh, Tokyo 05, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 〒1928505, JP)
International Classes:
B29C55/08; B29K1/00; B29L7/00
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Claims: