Title:
FILM ROLL AND MANUFACTURING METHOD OF THE SAME
Document Type and Number:
Japanese Patent JP2023092628
Kind Code:
A
Abstract:
To provide a film roll which has a thin and highly smooth film, has a small outer diameter irregularity change caused during storage as a film roll, and does not cause wrinkles, and a manufacturing method of the same.SOLUTION: A film roll in which a film is wound on a cylindrical core, in which a parameter Y obtained from an outer diameter change curve obtained by measuring a width direction outer diameter change of the film roll at 25 hours after winding (Y: In the outer diameter change curve of the film roll, a distance between an intersection of a tangent line connecting two adjacent protrusions and a line perpendicular to a width direction at the position of a minimum outer diameter in a recess sandwiched between two adjacent projection parts within a film roll width/2 interval and a minimum outer diameter position) is 150 μm or less, a thickness of a film is 1 μm or more and 30 μm or less, and a surface roughness SRa of at least one side of the film is 0.1 nm or more and 10 nm or less.SELECTED DRAWING: None
Inventors:
FUKUDA SATORU
MOCHIZUKI SHOHEI
MOCHIZUKI SHOHEI
Application Number:
JP2021207757A
Publication Date:
July 04, 2023
Filing Date:
December 22, 2021
Export Citation:
Assignee:
TORAY INDUSTRIES
International Classes:
B65H18/28; C08J5/18
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