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1. (WO2017038955) POLYVINYL ALCOHOL FILM ROLL

Pub. No.:    WO/2017/038955    International Application No.:    PCT/JP2016/075731
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Fri Sep 02 01:59:59 CEST 2016
IPC: B65H 75/00
B65H 18/16
G02B 5/30
Applicants: KURARAY CO., LTD.
株式会社クラレ
Inventors: SATO, Naoto
佐藤 直人
SASAI, Kouji
笹井 弘治
HADA, Hideyuki
秦 秀行
KAMEOKA, Seiji
亀岡 正次
HAMAOKA, Takashi
▲はま▼岡 高士
YAMAMOTO, Shota
山本 翔太
Title: POLYVINYL ALCOHOL FILM ROLL
Abstract:
Provided are: a roll obtained by winding a PVA film that is at least 2,000 m long and no more than 45 μm thick, wherein the average gap between adjacent films is no more than 5 μm; and a method for manufacturing a roll obtained by winding a PVA film that is at least 2,000 m long and no more than 45 μm thick, wherein a touch-winding scheme is employed, the pressure between a film roll and a contact roll is 3-30N per meter of axial length of the film roll, and the winding speed is no more than 30 m/min. Thereby provided is a PVA film roll that has excellent external appearance and does not readily become wrinkled or eccentric even when the PVA film is thin and has a high winding length.