| 摘要 |
PURPOSE: To enhance the toughness of a multilayered plastic pipe and to perfectly protect the pipe against scratch by forming a core pipe and laminating a protective layer of a plastic material having specific properties to the periphery of the core pipe. CONSTITUTION: For example, a core pipe 2 is produced from polyethylene and, as a plastic raw material used in a protective outer layer 3, for example, linear LPDE can be used and a regenerated plastic waste product can be also used. The advantage of linear LPDE resides in cost, high scratch resistance and burst resistance. The protective outer layer 3 is formed so that the whole or a bonding surface thereof, for example, only a pipe terminal is easily detached from the core pipe 2 by a simple means. In a pref. embodiment, by properly making the surface of the outer layer 3 hard, the surface of the outer layer 3 is lowered in adhesiveness and the structure of the layer becomes tough properly and, by striking the outer layer 3, the outer layer 3 can be detached from the pipe. |
