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High efficiency and versatility The high efficiency of plastic extruders is mainly reflected in high output, low energy consumption, and low manufacturing costs. In terms of function, the screw extruder has been used not only for the extrusion molding and mixing processing of polymer materials, but its use has been expanded to food, feed, electrodes, explosives, building materials, packaging, pulp, ceramics and other fields. In addition, the "one-step extrusion process" in which the kneading granulation and the extrusion molding process are combined is also worthy of attention.
Large-scale and precision The large-scale extrusion equipment can reduce production costs, which is more obvious in large twin-screw granulation units, blown film units, pipe extrusion units and other advantages. The major technical equipment required for the national key construction services and the large-scale extrusion granulation units, one of the three key equipments for large-scale ethylene projects, have long depended on imports. Therefore, it is necessary to accelerate the process of localization and meet the development needs of the petrochemical industry. The precision can improve the gold content of the product. For example, the multi-layer coextruded composite film needs precise extrusion, and as an important means to realize precise extrusion, the melt gear pump must intensify its efforts in development and research.
Modularization and specialization Modular production can adapt to the special requirements of different users, shorten the research and development cycle of new products, and strive for greater market share. Specialized production can arrange the various system module components of extrusion molding equipment to be fixed-point production and even carry out Global procurement, which is very beneficial to ensure the quality of the entire period, reduce costs, and accelerate cash flow.
Intelligent and networked extruders in developed countries have adopted modern electronic and computer control technologies. Process parameters such as melt pressure and temperature, the temperature of each section, the speed of the main screw and the feed screw, The amount of feed, the ratio of various raw materials, the current and voltage of the motor and other parameters are tested online and the closed-loop control of the microcomputer is used. Some companies have adopted online remote monitoring, diagnosis, and control to perform network control of extrusion molding lines. This is extremely advantageous for ensuring the stability of the process conditions and improving the accuracy of the product.
Plastic extruder five development trends
High-speed, high-production extruders are high-speed and high-output, enabling investors to obtain larger output and higher returns with lower investment. However, the high speed of the extruder screw also brings a series of difficulties that need to be overcome: If the residence time of the material in the screw is reduced, the mixing and plasticization of the material will be uneven, and the material undergoes excessive shear may cause the material to suddenly increase in temperature and heat. Decomposition, extrusion stability control difficulties will cause the fluctuating geometry of the extrudate, the accuracy of the associated auxiliary devices and control systems must be increased, the wear of the screw and barrel needs to use high wear-resistant and ultra-high wear-resistant materials, reducer How to improve the service life of bearings and bearings in high-speed operation needs to be solved.