Components Of A typical PVC Pipe Production Line as following: Conical twin screw Extruder: The starting point and heart of every pipe production line, the extruder machine heats and melts virgin or recycled plastic materials,delivering it to the pipe extrusion die head. Pipe extrusion die head: Forms the extruded plastic into the desired pipe profile. Vacuum & Cooling Tank: Cooling of the produced pipe, at a precise temperature range in order to cool and stabilize the pipe in the desired shape. Haul off/puller: Pulling of the pipe after cooling, ensuring consistent pipe thickness and dimensional stability. Pipe cutter: Positioned after the haul off machine, for cutting of the extruded pipe in the desired length during production. Stacking Unit:put after cutter for straight pipe laying for late transportation and use. Belling machine comes at the end,belling is the process of heating the end of a PVC tube and expanding its diameter using a mold.The enlarged end is called a bell, socket or the male-end.