Title:
FILM ROLL MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP2023110645
Kind Code:
A
Abstract:
To provide a film roll manufacturing method capable of reducing defects (fish-eyes, scratches, convex-concave defects located near a knurl part) generated in a film.SOLUTION: A film roll manufacturing method for manufacturing a film roll by winding a long-length film around a winding core, comprises the steps of: winding the long-length film on a touch roll; and winding up the long-length film wound on the touch roll around the winding core. The touch roll pushes the long-length film in the middle of manufacturing toward a center of the winding core. The long-length film has knurl parts each having a convex-concave part at both ends in a width direction of the long-length film. A planar shape when viewing the convex-concave part from a thickness direction of the long-length film includes a plurality of corners each having an angle of 80° to 100°. The number of the corners in the knurl part is 40/cm2 or more.SELECTED DRAWING: Figure 1
Inventors:
KOBAYASHI MAO
TAKAGI SHUNSUKE
TAKAGI SHUNSUKE
Application Number:
JP2022012226A
Publication Date:
August 09, 2023
Filing Date:
January 28, 2022
Export Citation:
Assignee:
NIPPON ZEON CO
International Classes:
B65H18/10; B29C59/16; G02B5/30
Attorney, Agent or Firm:
Sakai International Patent Office
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