Title:
FILM ROLL
Document Type and Number:
Japanese Patent JP2020152104
Kind Code:
A
Abstract:
To provide a method of manufacturing a film roll, in which the method prevents deterioration of a surface appearance of an optical functional layer, and occurrence of an optical unevenness in an alignment layer and a retardation layer, and that has a capability of stable production.SOLUTION: There is provided a method of manufacturing a film roll, comprising the steps of: obtaining an intermediate roll B by unwinding a film from an intermediate roll A, and by winding the film into a roll while slitting the same (step I); applying surface processing to at least one side of the film by unwinding the film from the intermediate roll B (step II); and obtaining a film roll by winding the surface-processed film into a roll (step III), in which an interval between the step I and the step II is longer than 2 hours, and when a difference between a maximum value and a minimum value of a surface hardness of the intermediate roll B at 1 hour after the completion of step I is deemed to Da, and when a difference between the maximum value and the minimum value of the surface hardness of the intermediate roll B at a time point 1 hour before the start of step II is deemed to Db, a value of Db-Da is 50 or less.SELECTED DRAWING: None
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Inventors:
OKAMOTO MASANORI
NAKAJIMA SACHIHIRO
USHIJIMA MASATO
NAKAJIMA SACHIHIRO
USHIJIMA MASATO
Application Number:
JP2020037693A
Publication Date:
September 24, 2020
Filing Date:
March 05, 2020
Export Citation:
Assignee:
TORAY INDUSTRIES
International Classes:
B29D7/01; B65H75/00; G02B5/30