... and for the use of vulcanizing rubber pipe. 1. machine compositionit consists of lead ... with compact construction, equithickness of extruded lead pipe, closed lead proceeding system, constant temperature and ... lead material saving. 2. major parametersextruder screw dia. 150mmextruder screw speed 5~150rpm pure lead ... 11~12rpm hard alloy lead 9~10rpmsheathed lead pipe dia. die holder No.1 10~80mm die ...