Title:
樹脂フィルムの製造方法
Document Type and Number:
Japanese Patent JP6458348
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a production method by which a resin film having nearly zero retardation Rth in a thickness direction can be produced by a melt-extrusion process.SOLUTION: The production method of a resin film includes: a step (I) of obtaining a resin film by extruding a resin at temperature equal to or higher than glass transition temperature thereof from a die into a film; and a step (II) of cooling the resin film by receiving the film on a support face of a support body. In the step (II), the resin film includes a first fixed region, a first stretched region, a center region, a second stretched region, and a second fixed region, in this order in a width direction of the resin film. The step (II) includes a step of bringing the first fixed region and the second fixed region of the resin film, into tight contact with the support face; and a stretched amount in the first stretched region and in the second stretched region when the same tension is applied to the film is larger than a stretched amount in the center region.
Inventors:
Manabu Haraguchi
Application Number:
JP2014064484A
Publication Date:
January 30, 2019
Filing Date:
March 26, 2014
Export Citation:
Assignee:
Zeon Corporation
International Classes:
B29C48/08; G02B5/30; B29C48/31; B29C48/88
Domestic Patent References:
| JP2015134453A | ||||
| JP6270227A | ||||
| JP2009166325A | ||||
| JP2012011624A | ||||
| JP8207119A |
Attorney, Agent or Firm:
Hiroaki Sakai