The extruding formation can also be called as extrusion molding. It is a forming method that with the help of the extrusion affection of screw or plug screw, and the uniform plasticization melting plastic can pass the mouth model forcibly so that it can form series of products with constant cross-section.

Extrusion forming is mainly used to forming thermoplastics and the forming fashioned product includes the covering of tubes, rods, plates, wires, films, cable wires and aluminum profile with a variety of cross-section shapes. In exceptional circumstances, extruding formation can also be used to forming several kinds of thermoplastic plastics.

The general working process of plastic extruder is adding the graininess plastic into the hopper when extruding, then extruding the material in the barrel along with the rotation of screw and the electricity heating of the out wall of barrel, and lastly producing melt plastic.

With the continuous improvement of modern extrusion technology especially the usage of high-speed extruding of latest-type screw and latest material (such as cross linking polyethylene and so on), the high-precision control system is needed in order to make sure the quality of high-speed extruding and original material saving.