| 摘要 |
PROBLEM TO BE SOLVED: To provide a winding core that can reduce a curl of paper and the like and can be reduced in weight via an increase in the outside diameter with no change in the inside diameter. SOLUTION: The winding core 1 comprises a cylindrical inner tube 2, a cylindrical outer tube 3 disposed about the inner tube 2 via a space part 5, and coupling members 4 for coupling the inner tube 2 and the outer tube 3 at both ends.
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