Plastic parts include:

- Plastic seals;

- Plastic insulated parts, plastic parts of machines and instruments;

- Plastic accessories for furniture, carriages, or similar products;

- Plastic headband earpiece;

- Plastic parts for electronic products;

- Plastic parts for lamps and lighting equipment.

Extruder is used to extrude tread, inner tube, rubber tube, and various rubber strips, as well as to cover cable and wire products. A common type is a screw extruder. Its working principle is: the rubber is stirred, mixed, plasticized, and pressed in the barrel by the rotation of the extrusion screw, and then moved towards the machine head, finally extruding a certain shape of product from the mouth. According to the needs of the product, multiple machines can be used for composite extrusion of various rubber compounds. Screw extruders are divided into hot feed and cold feed. Hot feed extruders typically feed strips preheated by an open mixer. The rubber fed by the cold feed extruder does not undergo heat refining, thereby eliminating the need for heat refining equipment.