| 摘要 |
PURPOSE:To enable to use for a long time, by a method wherein a core wire having specified diameter is provided to the molded body of high density ethylene with specified density. CONSTITUTION:For materials for heat storage body using high density ethylene type polymer, materials of the density of high density ethylene type polymer of above 0.930g/cm<3>, especially the density of 0.930-0.975g/cm<3> is used. High density ethylene type polymer is molded in cylinder type, and its outer diameter is ordinarily 1mm.-50mm.. A core wire is put in the center part of molded body and the ratio between the diameter (C) of core wire and the inner diameter (b) of the cylinder type molded body is 0.3-0.99 and especially the ratio of 0.40- 0.90 is most suitable. The ratio between the diameter (c) of the core wire and the outer diameter (a) of the cylinder c/a is 0.05-0.3, and the ratio 0.07-0.20 is most adequate. |
