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”.
On the whole, the study of twin-screw extrusion theory is still in the initial stage. This is the so-called "skills more than science". From the study of its extrusion process, there are roughly three links:
1. The law of polymer state change during the extrusion process, the principle of conveying the truth and law of the conveying and exhausting of solid melt, and the establishment of a mathematical and physical model to guide the design of the twin-screw extruder and the extrusion process optimization.
2. It is necessary to clarify the actual state of two or more polymers and materials during the extrusion process, the mixing form, the process of structural change, and the relationship between the final mixture and the performance.
3. As a twin-screw extruder, the internal relationship between the reaction process, speed, performance and screw configuration and operating conditions during extrusion reaction molding is established to establish a model to guide the reaction molding extrusion.
The development of twin-screw extruder: It was first successfully developed in Italy in the 1930s, and it developed rapidly in the late 1960s and early 1970s. The counter-rotating twin screw was developed with the development of RPVC products, and the contract has followed. With the development of polymer modification, the study of twin-screw extrusion theory cannot adapt to the development of applications, and has formed a consensus around the world, and has become a research hotspot.
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