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”.
Due to the fusion defect of material flow, it is difficult to ensure the production of PE-RT pipe. At present, spiral dies are mostly used, and the tensile expansion ratio is between 1.3-1.6. The smoothness of the die and the mandrel directly affects the appearance of the pipe. For example, due to the unstable output and quality, the pipe is prone to scratch and false crack and melt accumulation caused by water-cooling forming. After long-term use of high temperature and pressure, the pipe will cause blasting points from the marks and affect the service life of the product.
In practice, a die suitable for PE-RT extrusion is designed, which is called PE-RT special die. When the material flow from the extruder enters the die head, it is first divided into multiple strands through the quincunx split shuttle, and then converged to form an annular tubular material flow through the spiral split fluid. The material flows through the annular filter device, converges and gradually compresses, and finally enters the forming channel composed of mandrel and die to form pipe blank extrusion. The material flow is divided and converged for many times to achieve a high degree of homogenization and plasticization. Practice has proved that the die can realize PE-RT "low temperature and low pressure" extrusion advocated by advanced production lines. It is designed to ensure that the material will not be degraded due to excessive shearing, and is more suitable for high-speed production.
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