The unit adopts special-designed SJSZ 80 Conical Double-Screw Extruder, it adopts the frequency changer or the silicon-controlled rectifier direct current velocity modulation. The temperature control meter adopts the import or the joint venture product. It has the advantages of wide adjustment range, high precision, convenient operation and so on. The auxiliary parts is composed of vacuum calibration table, haul off, cutter and shelf. The unit adopts large cooling device to ensure the shaping result of door plate. The haul off adopts excellent quality reducer , motor and frequency converter. It has reasonable structure, large hauling force, steady hauling, etc. The cutter has the advantages of reliable and correct work, high precision of cutting, etc. The shelf has a movable buggy and special rubber protection layer. It has the advantages of no-wearing, simple use, etc. The auxiliary parts adopt programmable controller or control system made in China.