... the conical twin-screw extruder, a vacuum forming machine, a traction machine, a cutter, etc. The twin-screw extruder ... Stable performance and high production efficiency.5. Optional devices: pipe end expanding device, spiral muffler tube making unit and core foaming ... ,granules,profiles,film ,equipped with the vacuum forming machine,the traction machine,the cutter and the stacking frame . The conical ...