关键词: 优化, 造粒, 挤出, 筛网, 大块捕集器

Abstract:

The development process of extruder at home and abroad was reviewed, and the important components and process flow of extruder granulation unit were introduced. Through the investigation and technical exchange of the domestic polypropylene extrusion pelletizing unit, as well as the process technology analysis during the test, it was stated that there were shortcomings in the manufacture and design of the extrusion pelletizing unit's pelletizing water driving screen, centrifugal dryer large piece complementor, pelletizing water pipeline, the time of main motor no-load interlocking and three simultaneous sets of values. The cutter pressure and the speed of pelletizing machine, melt index and cylinder temperature were simulated and analyzed. The experience of plant construction, commissioning and operation in the same industry were studied, the pelleting water driving screen was optimized the particle shape observation pipe, the gap between centrifugal dryer large piece complementor and material door was optimized baffle plate, pelleting water pipeline was optimized the branch pipeline for breaking vacuum, main motor no-load interlock was optimized no-load interlock trigger time. The delay time of receiving the cutting through valve in “three simultaneous” was optimized. The cutter pressure and pelletizing machine speed, melt index and barrel temperature were fitted by software, the fitted data were applied to the actual operation of the extruder. Through the above process optimizations, the domestic large extrusion granulation unit realized long-term safe and stable operation, the polypropylene pellet shape was very good. The results showed that the implementation of the above processes optimization solved the problems in manufacturing, installation and operation of Huating extruder, and promoted the development of domestic extrusion granulation unit technology.

Key words: optimization, granulation, extrusion, screen, large piece complementor