Classification of screw extruder Classified according to the role of the screw machine: divided into continuous extrusion and discontinuous extrusion. Classified by number of screws: divided into single-screw, twin-screw and three-screw (multi-screw) extruders. Classified according to the form of screw: divided into integral screw and building block combined type twin screw (multi-screw). The twin-screw extruder can be further divided into a parallel twin-screw extruder and a conical twin-screw extruder, and parallel co-rotating and parallel counter-rotating twin-screw extruders. At present, the domestic single-screw extruder is the most widely used, and is suitable for the extrusion processing of general materials, but it has insufficient plasticization for material mixing, and the twin-screw extruder has more heat due to friction, and the material is subject to The shearing is relatively uniform, the conveying capacity of the screw is large, the extrusion is relatively stable, and the material stays in the barrel for a long time, so the material is uniformly mixed. Twin screw extruder / granulator use What is the application of the twin-screw extruder? Twin-screw extruder is an important equipment in plastic processing machinery. It is not only suitable for extrusion and mixing of polymer materials. Its use has been broadened to food, feed, electrodes, explosives, building materials, Packaging, pulp, ceramics, chemicals, LED materials and other fields. The high speed of the extruder screw also brings a series of difficulties that need to be overcome: if the residence time of the material in the screw is reduced, the material mixing and plasticization will be uneven, and the material will undergo excessive shearing, which may cause sudden temperature rise and thermal decomposition of the material. Difficulties in stability control will cause fluctuations in the geometry of the extrudate. The accuracy of the associated auxiliary devices and control systems must be increased. The wear of the screw and the barrel is intensified. High wear resistance and ultra-high wear resistance materials are required. The reducer and the bearing are at high speed. Problems such as how to improve their life in operation will need to be resolved. The electrical automation control of the extruder in the working process is also constantly developing. The traditional electrical control is realized by the single-machine automatic instrument. Nowadays, the touch screen and PLC composed of human-machine interface technology, computer technology and frequency conversion technology have been developed. Electrical control system consisting of temperature control template and frequency control. As we all know, extruders are constantly evolving and their use will become more widespread.