Wire-reinforced plastic tubes of helically - wound longitudinally overlapping extruded

摘要

Wire-reinforced plastic tubes of helically wound, longitudinally overlapping extruded sections. Device comprises a winding mandrel, a device feeding the plastic sections to the mandrel, a welding device and a wire feeder. The plastic section feeder has at least one driven feed roll which adjust the ratio between the rate of advance of the section and the winding speed of the mandrel.