Title:
【発明の名称】二軸配向ポリエステルフィルムの製造方法
Document Type and Number:
Japanese Patent JP2000500085
Kind Code:
A
Abstract:
The present invention relates to an improved process for preparing a biaxially oriented polyester film having excellent surface smoothness and uniform thickness and by drawing an amorphous polyester sheet in the longitudinal direction and then in the transverse direction, wherein the longitudinal drawing process is conducted in three successive steps; (i) a diagonal drawing at a total drawing zone length ranging from 10 to 500 mm, 100 to 140 DEG C and a drawing ratio ranging from 1.1 to 2.0; (ii) a parallel drawing at 100 to 140 DEG C and a drawing ratio ranging from 1.2 to 3.0; and (iii) a diagonal drawing 100 to 140 DEG C and a drawing ratio ranging from 1.5 to 3.0.
Inventors:
Saw, John Wook
Sim, One Sp
Sim, One Sp
Application Number:
JP51875497A
Publication Date:
January 11, 2000
Filing Date:
November 13, 1996
Export Citation:
Assignee:
SK Limited
International Classes:
B29C55/12; B29C55/04; B29C55/06; B29C55/14; B29D7/01; C08J5/18; B29K67/00; B29L7/00; (IPC1-7): B29C55/14
Attorney, Agent or Firm:
Takehiko Suzue (5 outside)