... consists of the conical twin-screw extruder, a vacuum forming machine, a traction machine, a cutter, etc. The twin-screw extruder and ... and the electric motor employ products of good quality. The traction machine works by caterpillars of 2, 3, 4 or 6. ... pipes,granules,profiles,film ,equipped with the vacuum forming machine,the traction machine,the cutter and the stacking frame . The conical twin ...