"Conical Co rotating Twin-Screw Extruder" is national patent product, researched and developed by our company (patent No.: 2005101189153), and its technology has reached international advanced standards. Connected to suitable auxiliary machines, various thermoplastics, especially rigid PVC, can be extruded into tubes, plates, thin pieces, films and profile bars directly. The product comprehensively optimized the advantages of the existing 2 kinds of twin-screw models ("Conical Counter Rotating" and "Parallel Co rotating"), not only keep the character of high extruding pressure of the former, but also reached the good plasticizing performance of the later. In addition, it reached the effect of higher mixing, higher-kneading, higher plasticizing. The result of several tests proved: the output of this machine is 50% higher than other extruders existing in the current market, and the consumption of electricity is 30% lower. Besides, it has the advantages of smaller noise and longer service life of screws. The domestic famous experts once said that the machines may replace the two existing twin-screw extruders, mastering the extruder market.