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Auxiliary equipment of twin screw extruder

by:TENGDA     2022-10-06

Auxiliary equipment of twin screw extruder:

1. Straightening device, in the sheath extrusion, the scratch on the sheath surface is caused by the bending of the cable core, and the bending will produce insulation eccentricity, resulting in product plastic extrusion waste. Therefore, the straightening device in various extrusion units is also indispensable. The main types of straightening devices are pressure wheel type, winch type, pulley type and drum type.

2. Cooling device, the molded plastic extruded cladding should be cooled and shaped immediately after leaving the machine head, otherwise deformation will occur, which requires a cooling device. The cooling method is mainly water cooling, and water cooling is divided into rapid cooling and slow cooling. Rapid cooling is direct cooling, which is conducive to shaping; slow cooling is to reduce the internal stress of the product.

3. Preheating device, the preheating of the twin-screw extruder cable core is very important for sheath extrusion and insulation extrusion. For sheath extrusion, its function is to dry the cable core to prevent moisture from entering the sheath and cause pores; it can also prevent the residual internal pressure of the extruded plastic due to quenching; The preheating of the core can completely remove the oil and water on the surface; in the extrusion process, the preheating can remove the cold wire entering the high temperature die head, forming a temperature difference, which can stabilize the extrusion volume and ensure the extrusion quality. This is also the twin-screw extrusion process. The reason why the manufacturer must use the preheating device.

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