| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein when different resin is used for an outer layer and a core layer of a three-layer resin film, curls are generated in the film having irregularity formed thereon.SOLUTION: The same resin is used for outer layers on the surface and back face. A index ratio of a moment of inertia of the cross section between the both outer layers to which irregularities are applied is set to be ≥0.8 and ≤1.2. |
