| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lightweight winding core which has high intensity and has an external cylindrical portion difficult to deform by a large amount of belt-like products being wound, the winding core can provide belt-like products with a high commercial value because even if the winding core deforms, the amount of deformation is extremely small, a shape after deformation is close to a circle, which is not substantially transferred to the belt-like products. <P>SOLUTION: In the winding core 1 configured with the external cylindrical portion 2 and an internal cylindrical portion 3, and between the external cylindrical portion 2 and the internal cylindrical portion 3, a rib 4 is connected in a radial fashion, and the rib 4 at an external cylindrical portion side of an arbitrary branch point 4a on the rib 4 is branched in a circumferential direction. <P>COPYRIGHT: (C)2013,JPO&INPIT |
