Dalian extrusion is an early technology in polymer processing, which plays an important role in plastic processing. After more than 100 years of development, extrusion products have accounted for more than 1 / 3 of the total plastic products. If the film from the flat die is cooled and shaped by a cooling drum with very smooth surface, the flat film can be prepared. This method is also known as extrusion casting method.

This is a common method for manufacturing polypropylene film. If the obtained flat film is fed into the tenter and stretched 4 ~ 10 times in the longitudinal and transverse directions at the same time (it can also be stretched longitudinally and then horizontally), the biaxially oriented film can be prepared. Due to the orientation of macromolecules during stretching, the film has high strength, but the water permeability and air permeability are reduced. It is commonly used in the manufacture of polypropylene and polyester films.

Extrusion molding factory, realized by extrusion die. The melt passes through the filter screen, filter plate, diversion area, compression area and forming area to become a tube. In recent years, with the rapid development of electronics, medical treatment, communication, automobile and other industries, people's requirements for high precision and high performance of plastic products are increasing day by day. The traditional plastic molding process has been difficult to meet the current high standard requirements. At the same time, Dalian injection molding is one of the important plastic molding methods.

Extrusion molding