Current situation and development prospect of Chin

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The current situation and development prospects of China's plastic machinery industry

after more than 20 years of development, China's plastic machinery industry has made great progress in terms of quantity and quality, and has become an important pillar of the development of the plastic industry. According to statistics, at present, China has an annual output of more than 8000 sets of extrusion equipment, more than 30000 injection molding machines, and more than 3000 sets of hollow molding equipment. At the same time, China imports about $1.5 billion of plastic machine manual rotating lead screws every year. Imported equipment is mainly large-scale and precision equipment, whose unit price is 8 ~ 10 times that of domestic equipment, and the added value is significantly higher than that of domestic equipment. Therefore, China is in an important period of moving from a manufacturing power to a manufacturing power. Data display, China's plastic machinery industry in 2003 "HP's open platform has promoted the progress of large-scale industrial production of materials. The total industrial output value is 12.821 billion yuan, with a year-on-year increase of 21.4%; the export earned foreign exchange of 582.9 million US dollars, with a year-on-year increase of 33.4%, and the export accounted for 37.6% of the total output value. It is estimated that the average annual growth rate of China's demand for plastic machinery from 2001 to 2010 is about 6%, and it is estimated that it will be 14.5 billion yuan by 2010. Therefore, the development potential of China's plastic machinery industry is great, and the momentum is very strong, especially in the first place Some models with high scientific and technological content, good performance and relatively moderate price, such as super large, precision and special injection molding machines, low-temperature and high-power single screw extruders, multi-layer coextrusion blow molding machines for the production of high impermeability and heat-resistant packaging materials, have good development prospects. From the perspective of the global market, the varieties of plastic machinery are mainly composed of injection molding machines, extruders/extrusion production lines and blow molding machines, which account for more than 80% of the total output value of plastic machinery, of which injection molding machines account for more than half of the total of these three types of machinery

China's plastic machine products have made breakthroughs in major comprehensive indicators, such as the design level of single screw extruders, but the actual number of cavities used depends on the yield of the project. Machining equipment, material processing and production application experience have the ability to manufacture similar equipment at the international advanced level; Significant progress has been made in the manufacturing technology of large-scale and precision plastic molding equipment; Coextrusion composite technology is also maturing

although China's plastic machinery has developed rapidly in recent years, there is still a certain gap compared with foreign products. China's plastic machinery industry mainly has the following problems:

equipment is heavily dependent on imports

some domestic plastic machinery enterprises have seized the great opportunity in recent years and achieved leapfrog development. They not only occupy a large domestic market share, but also have a considerable number of products exported abroad, but their export products are mainly sold to developing countries, which are medium and low-grade products. In terms of the overall technical level, the gap between China's plastic machinery and foreign developed countries is more than 20 years. In recent years, the plastic machine equipment that depends on imports mainly include: precision injection molding machine, one-step injection, drawing and blowing unit, large-diameter solid wall pipe and bellows production line, geomembrane production line, biaxial tensile film production line, drip irrigation pipe production line, medical catheter production line, audio-visual film base and photosensitive film base production line, twin-screw mixing and granulation equipment, among which the large-scale twin-screw extrusion granulation equipment for petrochemical industry basically depends on imports. This has resulted in the situation that the sales volume of more than 20 foreign plastic machinery enterprises in China is equal to the total sales volume of thousands of domestic plastic machinery enterprises

there is a significant gap in mechanical performance

compared with foreign products, there is a large gap in the performance of plastic machinery in China in terms of injection molding, extrusion molding speed, accuracy of injection molded products and control level of processing equipment. The filling speed of injection molding machines of foreign companies can reach 500 ~ 1000m/s, and the single machine output of blow molding 250ml beverage bottles can generally reach 15000 ~ 20000/h, while the maximum output of domestic equipment is 6000 ~ 8000/h; The average output of domestic extruder main machine is less than 60% of the foreign advanced level. The ES series electric injection molding machine with a clamping force of 20 ~ 360 tons produced by Nissei company in Japan can control the quality deviation of molded products within 0.00132g g g, the displacement control accuracy of the clamping mechanism can reach 0.03mm, and the temperature control accuracy can reach ± 0.5 ℃

the level of plastic processing equipment largely depends on the level of measurement and control. The control system of foreign advanced plastic machinery generally adopts programmable systems with PC, PLC, PCC as the core, and adopts fuzzy control, statistical process control (SPC), as well as network-based remote monitoring, fault diagnosis and control systems on some high-precision production equipment. In terms of advanced measurement systems, China basically relies on imports

the technical level is relatively backward

the per capita consumption of plastic products in China is only 14kg/year, ranking after 70 in the world. Therefore, the demand for plastic products and plastic machinery will maintain a high growth rate for a long time in the future. This provides a good development opportunity for China's plastic machinery enterprises. At the same time, foreign plastic machinery enterprises are aiming at China, which is a big market with great potential. They have provided a large number of plastic machinery for Chinese plastic products factories and tried to occupy a higher market share. However, domestic plastic machinery enterprises have little investment in technological innovation, mainly by imitating the products of their counterparts at home and abroad, and there are few products with independent intellectual property rights. This leads to the situation that domestic plastic machinery products lag behind foreign countries for a long time, and domestic products are the same. At the same time, there are few specialized research institutions of plastic machinery in China, and there is a serious shortage of scientific research and innovation funds. With China's entry into WTO, China has been constantly improving its intellectual and technological property rights. It has become the consensus of people of insight in the field of plastic machinery to increase investment in scientific and technological innovation, attract professional and technical personnel, achieve large-scale and professional production, and strive to shorten the huge gap in the technical level of plastic machinery at home and abroad

according to the development trend of China's plastic products, the needs of product structure adjustment and the actual situation of China's plastic machinery industry, China's plastic machinery industry should focus on solving five major problems in the coming period

I. stretching, compounding and foaming technology equipment of polymer materials stretching, compounding and foaming are extremely important special technologies in molding, involving raw material formula, molding process, plastic machinery and plastic mold. In recent years, China has made great progress in some fields, such as pur reaction injection, which is close to the level of Germany; Foamed pipes, foamed plastics and foamed films have reached the practical level. According to the market demand of foreign development, we should focus on the research of biaxial stretching film forming technology and equipment, so as to achieve the degree of technology practicality and equipment commercialization

II. Flat extrusion molding process and equipment

molding technology marked by "t" type (or hanger type) head has developed rapidly abroad in recent years, and is becoming more and more mature and perfect. Its importance and weight in plastic processing are rising rapidly

China is in the initial stage of developing such technologies and equipment, and most of them are blank. In recent years, some research and production units in China have developed PVC foaming board (plug card method and free foaming method) production lines, which have poor processability, and there is a big gap compared with foreign equipment

in order to master this kind of technology, we should focus on the equipment manufacturing of machine head, cooling and calendering devices, including the research of temperature and object rheology. On the basis of developing single-layer sheet production technology and equipment, many customers are easy to overlook the verification method of the experimental machine and develop coextrusion sheet production technology and equipment

III. principle and application of electromagnetic dynamic

electromagnetic dynamic extruder is the first in the world and has been successfully applied to some products within a certain range (such as small and medium-sized blown film production). The extruder saves energy and materials, and its economic and social benefits are unmatched by other technologies. However, it is not widely used at present. In addition to solving the corresponding forming device, there are still problems to be solved in the theory of electromagnetic dynamic extrusion, such as the heat balance under high speed and efficiency, and improving the plasticizing capacity and quality of high molecular weight materials

IV. detection and automatic control technology

in the developed plastic industry countries, the digital, intelligent control and proportional or servo system technology of injection molding materials has been mature, and is being rapidly updated and upgraded; The extrusion molding equipment realizes the on-line control of the whole line, and establishes a feedback system with the detection device

domestic plastic molding equipment is basically controlled by a single machine with less online control. Considering the large investment and high cost, thickness measuring devices and corresponding control technologies are rarely used

v. the establishment and application of computer cad/capp/cam system has been widely used abroad, and the basic conditions are also available in China, so it should be actively popularized and applied

to sum up, there is still much room for improvement in the technology and process of plastic machines in China. Therefore, domestic plastic machinery enterprises should improve the design and manufacturing level of domestic plastic machinery as soon as possible and increase the market competitiveness of domestic plastic machinery

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