Ningbo Fangli Technology Co., Ltd. is a mechanical equipment manufacturer with nearly 30 years’ experiences of plastic pipe extrusion equipment, new environmental protection and new materials equipment. Since its establishment Fangli has been developed based on user’s demands. Through continuous improvement, independent R&D on the core technology and digestion & absorption of advanced technology and other means, we have developed PVC pipe extrusion line, PP-R pipe extrusion line, PE water supply / gas pipe extrusion line, which was recommended by the Chinese Ministry of Construction to replace imported products. We have gained the title of “First-class Brand in Zhejiang Province”.
Plastic pipe has the characteristics of light weight, corrosion resistance, good insulation, low cost and long service life. It has been widely used in various fields. In the production of plastic pipes, the extrusion head plays an extremely important role, which is mainly reflected in the following points: ① Change the material from spiral motion to linear motion; ② Generate necessary forming pressure to ensure the compactness of products; ③ Further plasticize the material; ④ The product with the required section is formed through the machine head.
The head is generally composed of head body, diverter, diverter support, adjusting screw, core die, die lip, etc. the types of pipe extrusion head are generally divided into straight through type, right angle type, eccentric type, spiral type and screen basket type. The straight through head is the most commonly used, and its structure is shown in Figure 1. The head can be divided into the following three parts: the head body and diverter constitute the first part of the head, that is, the preform section; The compression section of the diverter support, die and core form the second part of the head, that is, the compression section; The straight sections of the die and core form the third part of the head, that is, the forming section.
The working principle of the straight through plastic pipe extrusion head is as follows: the melt extruded by the plastic extruder enters the preform section through the head body, becomes a thin ring under the action of the diverter, and flows through the diverter support into several streams; After that, it enters the compression section and enters the forming section through the compression section of the core die and die under the action of melt pressure. In the forming section, it is formed into a circular pipe shape, cooled and finally become a polymer plastic pipe.
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