塑料挤出机按其螺杆数量可以分为单螺杆挤出机、双螺杆挤出机和多螺杆挤出机。目前以单螺杆挤出机应用最为广泛，适宜于一般材料的挤出加工。
Plastic extruders can be divided into single-screw extruders, twin-screw extruders and multi-screw extruders according to the number of screw. At present, single screw extruder is the most widely used and suitable for extrusion processing of general materials.
双螺杆挤出机由于具有由摩擦产生的热量较少、物料所受到的剪切比较均匀、螺杆的输送能力较大、挤出量比较稳定、物料在机筒内停留长，混合均匀。

Twin-screw extruder has less heat generated by friction, more uniform shear of materials, larger screw www.zhutiezhamen.net.cnwww.buxiugangwanguan.cnwww.penwuganzaojii.cnwww.gangchensu.cn

www.chenban.net.cnwww.taocichenban.cnconveying capacity, more stable extrusion volume, long residence time of materials in the barrel, and even mixing.

单螺杆挤出机无论作为塑化造粒机械还是成型加工机械都占有重要地位，近几年业，单螺杆挤出机有了很大的发展。
Single screw extruder plays an important role in both plasticizing and granulating machine and forming and processing machine. In recent years, single screw extruder has made great progress.