FREMGANGSMAADE TIL FREMSTILLING AF ROERFORMEDE MUFFER BESTEMT TIL VARMEFORSEGLING TIL ROER ELLER ROERDELE

摘要

A heat sealable fitting primarily intended for joining thermoplastic gas service pipes is manufactured by winding a heated resistance wire on to a preform of thermoplastic material. The winding and preform are then encapsulated in a further layer of thermoplastic material.