| 摘要 |
PROBLEM TO BE SOLVED: To provide a roll product not using a paper tube, having no difficulties of disposal of a paper tube or the like, and providing usage to the last of a winding center without waste. SOLUTION: As a core for the roll product of a wound long sheet or film 1, a cylindrically bent flat plate 2 with both sides mutually joined is used comprising a material which can be flatly expanded after usage.
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