| 主权项 |
1. A winding spool for a transportable package for an elongated winding material having a substantially rotationally symmetrical conical hollow winding core top made of plastic, which has a first end having a smaller diameter and a second end having a larger diameter than that of the first end, wherein a cavity of the hollow winding core top is conical and open at both ends, the winding spool comprising:
a first flange and a second flange, wherein the winding core top is arranged detachably with at least the first flange at the first end of the winding core top and is connected with the second flange, which is arranged at the second end of the winding core top, wherein the conical hollow section of the winding core top, which is arranged between the two flanges, has a thin-walled configuration, wherein the conical hollow section has a length l between the first flange and the second flange, and an average wall thickness t, wherein the conical hollow section is made of a plastic having a modulus of elasticity (E modulus) in the range of 1000 N/mm2 to 30000 N/mm2, wherein an aspect ratio of 1/t is selected for this conical hollow section in dependence of the modulus of elasticity, and wherein the product of the modulus of elasticity (N/mm2) and the aspect ratio (mm/mm) is greater than at least one of 0.1×106, 0.2×106, 0.3×106 and less than at least one of 2.5×106, 1.5×106 and 0.8×106. |
