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”.
PE-RT pipeline production line is basically the same as general polyolefin pipeline production line, and the main difference is that the structure of cooling sizing part is different.
Due to the high viscosity of PE-RT melt, in order to make the pipe blank enter the calibrating sleeve smoothly, a precooling ring is generally added before the calibrating sleeve. In addition, due to the large enthalpy of PE-RT, in order to speed up the cooling speed, the combined cooling and shaping device of sleeve type and disc type can be used. The structure, machining accuracy and cooling mode of sizing sleeve are very necessary for the quality of PE-RT pipe. The disc water ring sizing sleeve (the cooling water circulates the sizing water sleeve, and the cooling water does not contact the pipe) can produce thin-walled (cold water) pipes in a short time. However, due to the high temperature and high viscosity when the materials enter the calibrating sleeve, the traditional water film calibrating sleeve will gradually rough or even break the appearance of the pipe in long-term production. Therefore, the production of PE-RT pipe, The water curtain disc calibrating sleeve is adopted to pre cool the pipe before entering the sizing sleeve. In addition, it also prevents the material from adhering to the inlet of the sizing sleeve and causing blockage. The enthalpy value of PE-RT material is large, especially when making pipes at high speed. In order to meet the faster extrusion speed, it is necessary to configure a longer sizing cooling length. Generally, the total cooling length of the production line is more than 23 meters, including one vacuum calibrating tank and two cooling water tanks. The purpose of cooling length configuration is to meet the cooling capacity required when producing 20x2.0mm pipe at a linear speed of more than 15m / min.
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