Plastic granulation extruder is one of the most important equipment


Posted January 27, 2022 by plasticgranulator

Plastic granulation extruder is one of the most important equipment for plastic molding processing.
 
Plastic granulation extruder is one of the most important equipment for plastic molding processing. It carries out solid conveying, compaction, melting, shearing and extrusion molding of plastics through external power transmission and heat transfer from external heating elements. Since the birth of the screw extruder, after nearly a hundred years of development, it has developed from an ordinary screw extruder to a new type of screw plastic granulation extruder. Although there are many types of new screw extruders, the extrusion mechanism is basically the same. The extrusion process of traditional screw plastic granulation extruder is realized by external heating of the barrel, solid material and barrel, screw friction and melt shear force. "Coefficient of friction" and "friction force", "viscosity" and "shear stress" are the main factors affecting the performance of traditional screw extruders.

Because the factors affecting "friction" and "viscosity" are very complex, traditional screw extruders The extrusion process is an unstable state and difficult to control, especially for some heat-sensitive plastics with poor thermal stability and high viscosity. Since the 1960s, scholars from all over the world have carried out a lot of research on the screw extrusion mechanism, and have also achieved obvious achievements. However, because their research is mostly limited to the traditional plastic extrusion molding mechanism, mechanical structure and energy conversion method, so A major breakthrough has not been achieved. A series of shortcomings of traditional screw extruders, such as large volume, high energy consumption, high noise, and difficulty in improving product quality, have not been fundamentally solved.

In 1979, Professor Qu Jinping boldly proposed the idea of ‚Äč‚Äčintroducing the vibration field into the whole process of extrusion molding after long-term observation, thinking and theoretical research in the practice of teaching and scientific research for many years. The structure of the screw extruder has been completely changed. After two years of hard work, in 1990, the first principle prototype of the electromagnetic dynamic plasticizing extruder was finally developed. The principle prototype adopts the direct energy conversion method to introduce the vibration field into the whole process of plasticization and extrusion, from the principle to the mechanical structure.

They are completely different from traditional screw extruders, which overcome many defects of traditional equipment, and have the advantages of small size, light weight, low manufacturing cost, low energy consumption, low noise, and good plasticizing and mixing effect. At the end of 1990, the Torch High-tech Industry Development Center of the State Science and Technology Commission organized experts to list it as a preparatory project for the 1991 National Torch Program for research and development after inspection and defense. In July 1991, one of the series of studies, "Research on Mechatronics and Electromagnetic Integration of Plastic Compounding Extrusion Equipment", was funded by the "Fok Yingdong Youth Education Fund". With the support of this fund, the co-extrusion and compounding mechanism of the electromagnetic dynamic plasticizing extrusion mechanism of plastics was studied in depth, and the engineering principle of polymer electromagnetic dynamic plasticizing extrusion was firstly proposed at home and abroad, and a relatively perfect polymer dynamic solid was established. The mathematical model of conveying, melting and melt conveying clarifies and quantitatively describes the basic laws of the dynamic plasticization and extrusion process of polymers. According to the new principle, the "Plastic Electromagnetic Dynamic Plasticizing Extrusion Equipment" pioneered at home and abroad has been developed.

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Tags plastic granulation extruder , plastic granule cutter , plastic mixing machine , plastic powder feeding
Last Updated January 27, 2022