The extrusion molding process of plastic pipe is divided into three stages:
I. Plasticization of raw materials. This process can make the solid materials turn into a uniform viscous fluid through the heating and mixing of the extruder;
II. Forming. Under the function of extrusion parts of the extruder, the molten material passes through the forming head continuously at a certain pressure and speed, so as to obtain a certain cross-section shape;
III. Cooling and calibration. The molten material can fix the obtained shape through calibration and cooling treatment, and become a solid state (plastic pipe).
The above three stages are realized by the main machine and auxiliary machine, that is, the extrusion unit. Specifically, the main machine is the extruder, and the auxiliary machine consists of head, calibration device, cooling device, traction device, cutting device and stacking frame.
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