Single screw extruder for HDPE pipe production line

The single-screw extruder is mainly composed of three parts: extrusion system, transmission system and heating and cooling system.

extrusion system
The main function of the extrusion system is to melt and plasticize the polymer material to form a uniform melt and realize the transformation from the glassy state to the viscous flow state. And in this process, a certain pressure is established, which is continuously extruded by the screw and transported to the die of the machine head. Therefore, the extrusion system plays an important role in the molding quality and output of extrusion processing.
The extrusion system mainly includes the feeding device, screw and barrel. It is the most critical part of the extruder. The screw is the heart of the extruder. Only through the rotation of the screw can the material move in the barrel and be pressurized and Partial heat. [1]
Transmission system
The transmission system usually consists of a motor, a reducer and a bearing. Its main function is to drive the screw and supply the torque and torque required by the screw during the extrusion process. During the extrusion process, the screw speed is required to be stable and not change with changes in screw load to ensure uniform product quality. However, in different situations, the screw is required to change speed so that one piece of equipment can adapt to the requirements of extruding different materials or products of different shapes. In most extruders, changes in screw speed are achieved by adjusting the motor speed, and the transmission system is also equipped with a good lubrication system and a rapid braking device. [1]
Heating and cooling systems
The heating and cooling system of the extruder consists of a heating device and a cooling device. It is a necessary condition for the smooth progress of the extrusion process. The heating device and cooling device must ensure that the polymer material is melted and plasticized and the temperature conditions during the molding process reach the technological level. Require.
The cooling device is generally installed on the barrel, screw and bottom of the hopper of the extruder. Barrel cooling can be water cooling or air cooling. Generally, small and medium-sized extruders mostly use air cooling; large extruders mostly use water cooling or a combination of the two forms. Screw cooling mainly uses central water cooling, with the purpose of increasing the solid material conveying rate, stabilizing the output, and improving product quality. The cooling device at the bottom of the hopper is mainly to enhance the transportation of solid materials and prevent the material particles from becoming sticky due to temperature rise, blocking the material opening and thus affecting the feeding. Generally, for extruders and high-speed extruders with a screw diameter of 90mm or more, a cooling device must be installed at the bottom of the hopper.

The use of single screw extruder
1. Pipe extrusion: suitable for PP-R pipes, PE gas pipes, PEX cross-linked pipes, aluminum-plastic composite pipes, ABS pipes, PVC pipes, HDPE silicon core pipes and various co-extruded composite pipes.
2. Plate and sheet extrusion: suitable for extrusion of PVC, PET, PS, PP, PC and other profiles and sheets. Extrusion of various other plastics such as wire, rod, etc.
3. Extrusion of profiles: Adjusting the speed of the extruder and changing the structure of the extrusion screw can be applied to the production of various plastic profiles such as PVC and polyolefins. Modified granulation: suitable for blending, modification and enhanced granulation of various plastics.
design concept

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