Principle of twin screw plastic extruder


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”.



Firstly, the twin-screw extruder has the extruder principle of single screw extruder: solid conveying, melt pressurization and pumping, mixed stripping and devolatilization, but it is not simply so. The research of twin-screw extrusion theory began late, coupled with its many types, complex screw geometry and complex extrusion process, which brings many difficulties to the research.


On the whole, the research of twin-screw extrusion theory is still in the initial stage, which is the so-called "technology is more than science". The study of its extrusion process can be divided into three links:


1According to the change law of polymer state in the extrusion process, the conveying principle, the truth and law of solid melt conveying, a mathematical and physical model is established to guide the design of twin-screw extruder and the optimization of extrusion process


2It is necessary to find out the real state change of more than two kinds of polymers and materials in the extrusion process, the process of mixing morphology and structure change, and the relationship between the final mixture and properties


3、As a twin-screw extruder, the internal relationship between the reaction process, speed and performance of extrusion reaction molding and the screw configuration and operating conditions is established to guide the reaction molding extrusion.


If you need more information, Ningbo Fangli Technology Co., Ltd. welcomes you to contact for a detailed inquiry, we will provide you with professional technical guidance or equipment procurement suggestions.

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