和隔膜泵相比，单螺杆泵可输送各种混合杂质，含有气体及固体颗粒或纤维的介质，也可输送各种腐蚀性物质。
And diaphragm compared to single-screw pump can transport all kinds of mixed impurity containing gas and solid particles or fibers of the media, but also transport all kinds of corrosive substances.
挤出机：平行双螺杆挤出机的特点以产量高，塑化优良。真空排气提高了产品的质量。它可以处理各种塑料。
Extruder: Parallel double screw extruder is characterized by high output and good plasticization. The vacuum exhaust improves products quality. It can process various sorts of plastic.
进行了各种相关工艺条件对挤出造粒的影响，包括挤出速度、模头温度及螺杆形式和定型模具对挤出成型的研究；
The impact of various process conditions on extrusion and pelletizing is studied, including the change of extrusion speed, die head temperature and screw types.
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