| 摘要 |
PURPOSE:To enable to continuously manufacture the titled pipe by extrusion without generating die waste over a long period of time by a structure wherein organic macromolecular material skin layer is formed on a water crosslinkable polyolefin pipe main body. CONSTITUTION:A skin layer S consisting of organic macromolecular material P2 is formed on a pipe main body R consisting of water crosslinkable polyolefin P1 by extruding the water crosslinkable polyolefin P1 simultaneously with the organic macromolecular material P2, which prevents die waste from developing. Because at least when the water crosslinkable polyolefin P1C passes the tip of a forming die 5, the outer surface of P1 has been covered with the skin layer S consisting of the organic macromolecular material, which develops no die waste, the skin layer S prevents residual unsaturated silane compound or other compounding agent from separating out onto the outer surface at the tip of the forming die 5, resulting in preventing die waste from generating. |
