... plastic window/door/mirror/photo frame/decking/fence/bench/ceiling extrusion line is optimized in design with reference to the newest technology ... is composed of one conical double-screw extruder and a single extruder, vacuum calibration table, hauling off machine, cutter, film ... material, and the effect is better than that of the single-screw extruder. Features: 1 I. Advantages of the machines ...