PRODUCTION METHOD FOR PHASE SHIFT FILM, AND PRODUCTION METHOD FOR CIRCULAR POLARIZING PLATE

Title:

PRODUCTION METHOD FOR PHASE SHIFT FILM, AND PRODUCTION METHOD FOR CIRCULAR POLARIZING PLATE

Document Type and Number:

WIPO Patent Application WO/2014/199689

Kind Code:

A1

Abstract:

Provided is a method whereby a phase shift film having reduced biaxiality, a small Nz coefficient, and a slow axis lying in a diagonal direction can be produced at high production efficiency. This production method for phase shift film comprises: clipping the left and right side edge portions of a film to be stretched, respectively within left and right clips of variable pitch type having a clip pitch that is variable in the longitudinal direction; preheating the film; with the location at which the clip pitch of either the left or right clips begins to decrease and the location at which the clip pitch of the other clips begins to decrease positioned at different positions in the longitudinal direction, the clip pitch of the respective clips are reduced to a prescribed pitch, stretching the film diagonally; and the clips which clip the film are released.

More Like This:

JP2828569

OPTICAL FILM OR SHEET

Inventors:

SHIMIZU TAKASHI (JP)
HIRATA SATOSHI (JP)
KONDO SEIJI (JP)
MURAKAMI NAO (JP)

Application Number:

PCT/JP2014/056433

Publication Date:

December 18, 2014

Filing Date:

March 12, 2014

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NITTO DENKO CORP (JP)

International Classes:

B29C55/04; G02B5/30; G02F1/1335; G02F1/13363; B29L7/00; B29L11/00

Domestic Patent References:

WO2012017639A1

2012-02-09

Foreign References:

JP2005321543A	2005-11-17
JP4845619B2	2011-12-28
JP2012067300A	2012-04-05
JP3325560B2	2002-09-17
JP2007161994A	2007-06-28

Other References: