Film roll and method for manufacturing film roll capable of suppressing occurrence of winding defects
The present invention aims to provide a film roll capable of suppressing occurrence of winding defects. The film roll (1) has a resin film (20) wound up, and the resin film (20) has knurl parts (31, 32) at both ends in the width direction of the resin film (20); the knurl parts (31, 32) are equipped...
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Main Authors | , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
16.12.2022
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Subjects | |
Online Access | Get full text |
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Summary: | The present invention aims to provide a film roll capable of suppressing occurrence of winding defects. The film roll (1) has a resin film (20) wound up, and the resin film (20) has knurl parts (31, 32) at both ends in the width direction of the resin film (20); the knurl parts (31, 32) are equipped with a plurality of unit knurls (40) spaced apart from each other and regularly arranged; each unit knurl (40) includes: an upper convex portion (41), which is in a circumferential shape, formed on the upper surface (21) of the resin film (20), and protruding upwardly, and the lower convex portion (42), which is in a circumferential shape, formed on the lower surface (22) of the resin film (20) and protruding downwardly. In a plan view, the lower convex portion (42) is arranged on the inner side of the upper convex portion (41), and arranged concentrically with the upper convex portion (41). |
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Bibliography: | Application Number: TW202211114229 |