Extrusion molding is a process in which a plastic material with a certain degree of plasticity is continuously pressed out through a mouth under certain conditions, so that it becomes a product with a certain cross-sectional shape.

As the rubber material moves forward along the screw, the viscosity and plasticity of the rubber material change to a certain extent due to mechanical and thermal effects, and it becomes a viscous fluid. According to the change of the rubber material in the extrusion process, the working part of the screw is generally divided into three parts: feeding section, compression section and extrusion section according to its different functions.

The features of each section are as follows:

1. Feeding section: also known as the solid conveying section, this section starts from the feeding port to the beginning of the melting of the rubber. After the rubber material enters the feeding port, under the pushing action of the rotating screw, it moves relative to the screw groove and the inner wall of the barrel, and forms a certain size of glue group.

2. Compression section: also known as the plasticization section, this section starts from the beginning of the melting of the rubber to the flow of all the rubber. The compression section receives the micelle sent from the feeding section, compacts it, further softens it, and discharges the air entrained in the rubber to the feeding section.

3. Extrusion section: Also known as the metering section, the rubber material delivered from the compression section is further pressurized and stirred. At this time, a completely flowing state of the rubber material has been formed in the threaded groove. Due to the rotation of the screw, the rubber material flows and is evenly extruded from the flow channel of the die with a certain capacity and pressure.

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