| 摘要 |
PURPOSE:To enable to obtain a pipe connection with enough strength by a structure wherein a non-crosslinkable polyolefin skin layer is formed on a pipe main body and, after that, organic peroxide is coated on the skin layer. CONSTITUTION:Firstly, a skin layer S is formed out of non-crosslinkable poly olefin pipe P2 extruded from an extruder 7 on a pipe main body R. Secondly, organic peroxide as crosslinker is coated on said formed skin layer S. Said application of the non-crosslinkable polyolefin skin layer S on the pipe main body R prevents die waste from developing. The following coating of organic peroxide on the skin layer S in order to turn non-crosslinkable skin layer into heat crosslinkable skin layer causes the skin layer S to heat-crosslink at an arbitrary time point before and after the connection of pipes, resulting in ena bling to continuously produce a water crosslinkable polyolefin pipe by extrusion over a long period of time. The obtained pipes can realize a pipe connection with high compressive strength when connected by bonding. |
