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High-speed, high-production extruders are high-speed and high-output, enabling investors to obtain higher output and higher returns with lower investment. However, the high speed of 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 excessive shear of the material may cause rapid temperature rise of the material. Thermal decomposition, extrusion stability control difficulties will cause 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, slow down How to increase the service life of the device and the bearing in high speed operation needs to be solved.
The efficiency of high-efficiency, multi-functional plastic extruders is mainly reflected in high output, low energy consumption, and low manufacturing costs. In terms of functions, screw extruders are not only used for extrusion molding and compounding of polymer materials, but their uses have expanded to food, feed, electric carbon, electrodes, explosives, building materials, packaging, pulp and 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.
The large-scale and precise realization of 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.
Modular and professional "modular" production can adapt to the special requirements of different users, shorten the development cycle of new products, and strive for greater market share; and "specialized" production can arrange the various system module components of extrusion equipment. Fixed-point production even makes global purchases, which is very beneficial to ensure the quality of the whole machine, reduce costs, and accelerate the turnover of funds.
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 on extrusion molding lines. This is extremely advantageous for ensuring the stability of the process conditions and improving the accuracy of the product.
China Plastics Machinery Industry has determined that the "Eleventh Five-Year Plan" development strategy is to closely focus on the plastic machinery required by the state's key projects and pillar industries, in the direction of high efficiency, energy conservation, material saving, environmental protection, large-scale, precision, and multi-layered Development, and strive to improve the technical content of existing products. It is believed that this strategy will further promote the development of China's plastics machinery industry.
Experts believe that the development trend of China's plastics machinery is to move toward combinatorial structure, specialization, serialization, standardization, compounding, miniaturization, large-scale, personalization, and intelligentization. At the same time, it must meet energy-saving, material-saving, and high-efficiency requirements. The request.