Experts believe that the development trend of China's plastic machinery is to develop in the direction of combined structure, specialization, serialization, standardization, compounding, miniaturization, large-scale, individualized and intelligent, while meeting energy conservation, material saving and high efficiency. Requirements.
High-speed, high-yield extruders are high-speed, high-yield, allowing investors to achieve higher output and high returns with lower investment. However, the high speed of the extruder screw speed also brings a series of difficulties to be overcome: if the residence time of the material in the screw is reduced, the material mixing and plasticization will be uneven, and the material may be subjected to excessive shearing, which may cause the material to heat up rapidly. Thermal decomposition, difficult to control the extrusion stability will cause the geometry of the extrudate to fluctuate, the accuracy of the relevant auxiliary devices and control systems must be improved, and the wear of the screw and the barrel is intensified by using high wear-resistance and ultra-high wear-resistant materials. Problems such as how to improve the life of the device and the bearing at high speeds need to be solved.
The high efficiency of multi-functional plastic extruders is mainly reflected in high output, low energy consumption and low manufacturing cost. In terms of functions, screw extruders are not only used for extrusion molding and mixing of polymer materials, but their use has been extended to food, feed, electric carbon, 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 into one is also worthy of attention.
Large-scale and precision realization of large-scale extrusion molding equipment can reduce production costs, which is more obvious in large-scale twin-screw granulating units, blown film units, and pipe extrusion units. The major technical equipment required for national key construction services, and the large-scale extrusion granulation unit of one of the three key equipments for large-scale ethylene projects have long relied on imports. Therefore, it is necessary to speed up the localization process to meet the development needs of the petrochemical industry. Precision can increase the gold content of the product, such as multi-layer co-extruded composite film, which requires precision extrusion, and as an important means to achieve precision extrusion, the melt gear pump must be intensively developed.
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 various system module components of extrusion molding equipment. Fixed-point production and even global procurement are very beneficial to ensure the quality of the whole machine, reduce costs and accelerate capital turnover.
Intelligent and networked extruders in the developed world have adopted modern electronic and computer control technology, process parameters for the entire extrusion process such as melt pressure and temperature, body temperature, main screw and feed screw speed, The feeding amount, the ratio of various raw materials, the current and voltage of the motor, etc. are detected online, and the closed-loop control of the microcomputer is adopted. Some companies have adopted online remote monitoring, diagnosis and control to control the network of extrusion molding lines. This is extremely advantageous for ensuring the stability of the process conditions and improving the accuracy of the product.
China's plastic machinery industry has determined that the strategy for the “Eleventh Five-Year Plan†is to focus on the plastic machinery needed for national key projects and pillar industries, towards high efficiency, energy saving, material saving, environmental protection, large, precise and multi-layered directions. Develop and strive to improve the technical content of existing products. It is believed that this strategy will further promote the development of China's plastic machinery industry.
High-speed, high-yield extruders are high-speed, high-yield, allowing investors to achieve higher output and high returns with lower investment. However, the high speed of the extruder screw speed also brings a series of difficulties to be overcome: if the residence time of the material in the screw is reduced, the material mixing and plasticization will be uneven, and the material may be subjected to excessive shearing, which may cause the material to heat up rapidly. Thermal decomposition, difficult to control the extrusion stability will cause the geometry of the extrudate to fluctuate, the accuracy of the relevant auxiliary devices and control systems must be improved, and the wear of the screw and the barrel is intensified by using high wear-resistance and ultra-high wear-resistant materials. Problems such as how to improve the life of the device and the bearing at high speeds need to be solved.
The high efficiency of multi-functional plastic extruders is mainly reflected in high output, low energy consumption and low manufacturing cost. In terms of functions, screw extruders are not only used for extrusion molding and mixing of polymer materials, but their use has been extended to food, feed, electric carbon, 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 into one is also worthy of attention.
Large-scale and precision realization of large-scale extrusion molding equipment can reduce production costs, which is more obvious in large-scale twin-screw granulating units, blown film units, and pipe extrusion units. The major technical equipment required for national key construction services, and the large-scale extrusion granulation unit of one of the three key equipments for large-scale ethylene projects have long relied on imports. Therefore, it is necessary to speed up the localization process to meet the development needs of the petrochemical industry. Precision can increase the gold content of the product, such as multi-layer co-extruded composite film, which requires precision extrusion, and as an important means to achieve precision extrusion, the melt gear pump must be intensively developed.
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 various system module components of extrusion molding equipment. Fixed-point production and even global procurement are very beneficial to ensure the quality of the whole machine, reduce costs and accelerate capital turnover.
Intelligent and networked extruders in the developed world have adopted modern electronic and computer control technology, process parameters for the entire extrusion process such as melt pressure and temperature, body temperature, main screw and feed screw speed, The feeding amount, the ratio of various raw materials, the current and voltage of the motor, etc. are detected online, and the closed-loop control of the microcomputer is adopted. Some companies have adopted online remote monitoring, diagnosis and control to control the network of extrusion molding lines. This is extremely advantageous for ensuring the stability of the process conditions and improving the accuracy of the product.
China's plastic machinery industry has determined that the strategy for the “Eleventh Five-Year Plan†is to focus on the plastic machinery needed for national key projects and pillar industries, towards high efficiency, energy saving, material saving, environmental protection, large, precise and multi-layered directions. Develop and strive to improve the technical content of existing products. It is believed that this strategy will further promote the development of China's plastic machinery industry.
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