单螺杆挤出机的螺杆形式应如何选择？-Technology Plastic extrusion-Jiangsu Faygo Union Machinery Co., Ltd-Bottle blowing machine,extrusion production lines,air compressor manufacturer

　单螺杆挤出机的螺杆新式通常应根据所加工物料的性质进行选择，一般加工如PVC等非结晶物料时应选择渐变型螺杆，而加工如PE、PP等结晶性塑料应选择突变型螺杆，以使用结晶性塑料因熔融温度范围较窄，熔融时提及的突变，从而保证熔体处于压实状态，以排出熔体中的气体挥发分。

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