Dalian extrusion molding looks for the generation age of extrusion molding technology. It may be related to the extrusion processing of macaroni and other food, brick and ceramic products. As for the early use of extrusion method in polymer processing, it is generally agreed that the patent application of patent applicant R. brooman on extrusion molding of wire with gutta percha as coating began in 1845.

Paul TROESTER, a German machinery manufacturer, produced and sold screw extruders early. In the 20 years from l892 to 1912, he produced and sold more than 500 screw extruders. Also this manufacturer, developed and produced an extruder for thermoplastic in 1935. Before that, the length diameter ratio of extruder screw was about 3-5.

Obviously, extruding rubber is not a problem, but for thermoplastics, it is impossible to meet the plasticization requirements. In addition to increasing the length diameter ratio of the extruder screw, the company has also made many improvements in heating mode, feeding device and transmission device. It can become valuable products through molding processing. Molding is an indispensable production link of polymer materials.

Extrusion molding, as an important technology in polymer processing industry, is developed by mutual promotion and interdependence in polymer resin application engineering technology and extrusion production equipment development technology. All kinds of extruded products: hard PVC pipes in the early years, coated wires, polystyrene, polypropylene and ABS sheets and plates, polyethylene blown film and coated film, today's PVC profiles, cross-linked polyethylene, aluminum-plastic composite, PPR pipes, biaxially stretched polypropylene film, multi-layer co extruded composite film, with high barrier, air permeability, self-adhesive, heat shrinkable Films with special properties such as self elimination.