| 摘要 |
PROBLEM TO BE SOLVED: To prevent the transferring of the stepped shape of the end face of a sheet, taking place at a core when a flexible sheet such as a flexible print substrate and the like is wound into a roll shape. SOLUTION: This tube is formed out of elastic resin whose vicat softening point is 50 to 125 deg.C. In the case, the outer diameter R2 of a core to be covered by the inner diameter R1 (mm) of the tube, shall satisfy the following relations: 0.5<=R2-R1<=6.0 0.930<=R1/R2<=0.997 By this constitution, the transfer of the stepped shape at the end face of a sheet, taking place at a core when a flexible sheet is wound in a roll shape, is prevented, and a tube made of elastomer resin can be easily peeled off.
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