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Author: Baina Date: Sep 23, 2022

The Composition of the Extrusion System of The Rubber Extruder

Rubber extruder extrusion system includes:

Screw, barrel, hopper, head, and mold, plastic is plasticized into a uniform melt through the extrusion system, and under the pressure established in this process, it is continuously extruded by the screw head.

1. Hopper: The bottom of the hopper is equipped with a cut-off device to adjust and cut off the material flow, and the side of the hopper is equipped with a viewing hole and a calibration metering device.

2. Barrel: It is a metal cylinder, which is generally made of alloy steel or composite steel pipe lined with alloy steel that is not afraid of heat, good compressive strength, strong and corroded. The barrel cooperates with the screw to realize the pulverization, softening, melting, plasticizing, exhausting and compacting of the plastic, and continuously and uniformly convey the rubber material to the molding system. Generally, the length of the barrel is 15 to 30 times its diameter, so that the plastic must be sufficiently heated and plasticized.

3. Screw: It is the main part of the extruder, which is directly related to the application range and productivity of the extruder. It is made of alloy steel that is not easy to corrode.

4. Machine head and mold: The machine head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve. The machine head is equipped with a forming mold. The function of the machine head is to convert the rotating plastic melt into a parallel linear motion, uniform and stable. It is introduced into the mold sleeve and imparts the required molding pressure to the plastic. The plastic is plasticized and compacted in the barrel, and then flows into the forming die of the die through the neck of the die through the porous filter plate along the corresponding flow channel. A continuous and dense tubular cladding layer is formed around the core wire. In order to confirm the correct plastic flow channel in the machine head and solve the dead angle of accumulated plastic, a shunt sleeve is often installed. In order to solve the pressure fluctuation during plastic extrusion, a pressure equalizing ring is also installed. The machine head is also equipped with a mold correction and adjustment device, which is convenient for adjusting and correcting the concentricity of the mold core and the mold sleeve.

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