Through the joint efforts of the technical and R&D personnel in the industry, some major special machines such as exhaust extruders, tandem mill screw extruders, reciprocating pin screw extruders, foaming extruders, extruders with melt gear pumps, tandem multi-stage extruders, planetary screw extruders, etc. have been produced by manufacturers in China with independent R&D capabilities and enjoy independent intellectual property rights.
  Extruders can be divided into single-screw, twin-screw and multi-screw extruders according to the number of screws. At present, the single-screw extruder is the most widely used and is suitable for general material extrusion processing. The twin-screw extruder has the features of forced extrusion, high quality, wide adaptability, long life, small shear rate, less decomposition of materials, good mixing and plasticizing performance, direct molding of powder, etc. Features: temperature self-control, vacuum exhaust and other devices. It is suitable for the production of pipes, plates, shaped materials and other products.
  Single-screw extruder occupies an important position whether as plasticizing and granulating machinery or forming and processing machinery, in recent years, single-screw extruder has a great development. The main symbol of the development of the single-screw extruder is the development of its key components - the screw.
  In recent years, people have conducted a lot of theoretical and experimental research on the screw, so far there are nearly 100 kinds of screws, common separation type, shear type, barrier type, diversion type and wave type. From the single-screw development, although in recent years the single-screw extruder has been more perfect, but with the continuous development of polymer materials and plastic products, will emerge more characteristic of the new screw and special single-screw extruder.
  In the plastic extrusion molding equipment, plastic extruder is usually called the main machine, and its follow-up equipment plastic extrusion molding machine is called the auxiliary machine. After more than 100 years of development, plastic extruders have been derived from the original single-screw, twin-screw, multi-screw, even screwless and other models. Some processing and manufacturing enterprises lack of innovation of enterprise cost management mode, there are imperfect cost management system, managers cost management concept is not strong lack of strategic, cost information is old, cost control is not effective, lack of incentives and other problems, which seriously restrict the development of processing and manufacturing enterprises and the economy.

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