Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
POLYVINYL ALCOHOL FILM ROLL AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/054509
Kind Code:
A1
Abstract:
Provided are: a polyvinyl alcohol film roll which is wound around a spool and in which wrinkles or eccentricity does not occur even when the length and width of the polyvinyl alcohol film are increased; and a production method for the polyvinyl alcohol film roll. In this polyvinyl alcohol film roll, a polyvinyl alcohol film 2 having a width of 3.5 m or more, a thickness of 60 μm or less, and a length of 5000 m or more is wound around a spool 1 having an axial length of 3.5 m or more, and variations in winding hardness in the width direction of the polyvinyl alcohol film 2 are 15 or less in terms of durometer hardness. In addition, in this production method for the polyvinyl alcohol film roll, the polyvinyl alcohol film 2 is wound around the spool 1 with the polyvinyl alcohol film 2 in contact with at least a first control roller 11 or a second control roller 12, whereby the angle α of entry of the polyvinyl alcohol film 2 to be wound is maintained in the range of 2-35°.

Inventors:
DEGUCHI SATOKI (JP)
KAWATA KOUSHI (JP)
YOSHIKAWA YUJI (JP)
ICHIHASHI ITSUKI (JP)
TAKAGI YUUMA (JP)
Application Number:
PCT/JP2019/034584
Publication Date:
March 19, 2020
Filing Date:
September 03, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MITSUBISHI CHEM CORP (JP)
International Classes:
B65H18/28; B65H18/26; B65H75/00; C08J5/18; G02B5/30
Domestic Patent References:
WO2017043514A12017-03-16
WO2018034182A12018-02-22
WO2017038955A12017-03-09
Foreign References:
JPH01203143A1989-08-15
JP2001269715A2001-10-02
Attorney, Agent or Firm:
SAITOH Yukihiko et al. (JP)
Download PDF: