Analysis and introduction of the development statu

2022-08-22
  • Detail

Analysis on the development status and level of China's plastic machinery industry

the plastic machinery industry provides processing equipment for the plastic products industry. In recent years, China's plastic machinery industry has developed rapidly, and its development speed and main economic indicators are among the top 194 industries in the machinery industry. The annual manufacturing capacity of plastic machinery is about 200000 sets, with a complete range of categories, ranking first in the world

at present, there are nearly 400 major plastic machinery manufacturing enterprises in China, about 200 large and medium-sized enterprises, and 10 backbone enterprises on a large scale. Emerging plastic machinery enterprises grasp high and new technology, and have a series of characteristics such as scientific and technological innovation, system innovation, management innovation, etc., which have attracted the attention of counterparts at home and abroad

Chinese plastic machinery enterprises are mainly distributed in the southeast coast and the Pearl River Delta, among which Ningbo has the strongest development momentum and has become the largest production base of injection molding machines in China. The annual production volume accounts for more than 1/2 of the total annual output of domestic injection molding machines and 1/3 of the world's injection molding machines

with the upgrading of the plastic mold industry, technological innovation has also witnessed unprecedented gratifying changes. Most enterprises in Shantou, Guangdong have introduced the latest computer automated mold processing technology from Germany, France, Italy and Taiwan Province of China, which has greatly improved the technical performance and quality of the mold

although China's plastic machinery has developed rapidly and produced many varieties, it can basically supply the general technical equipment required for the processing of domestic plastic raw materials and the processing and molding of plastic products, and some products have also entered the forefront of the world, compared with industrial developed countries such as Germany, Japan and Italy, China's plastic machinery still has a certain gap, mainly in the aspects of few varieties, high energy consumption, low control level, unstable performance, etc

at present, China's plastic machinery products are mainly concentrated in general-purpose small and medium-sized equipment, with low technical content. In the 1920s, the supply of low-grade products exceeded demand, with excess machinery manufacturing capacity and declining enterprise benefits. Some varieties, especially super refined large and high-end products, are still blank and still need to be imported. According to statistics in 2001, China imported plastic machinery using foreign exchange of 1.12 billion U.S. dollars, while the export of plastic machinery earned foreign exchange of only 130 million U.S. dollars, imports are far greater than exports

after China's accession to the world economic and Trade Organization (WTO), the transfer of foreign machinery manufacturing industry to China has accelerated. Some world-renowned plastic machinery enterprises, such as Demark, Krupp, badenfeld, Sumitomo heavy industries of Japan, have successively entered China, and some have further established technology centers. The entry of foreign plastic machinery manufacturers has brought fixed development vitality to the other end of China's plastic machinery industry, and also made China's plastic machinery manufacturing enterprises full of opportunities and challenges

1. Development status and level of plastic machinery

1.1 open mill

open mill is a double roller plasticizer, also known as open plasticizer, which is the most basic equipment in plastic machinery. It is mainly used for mixing plastics, feeding calenders and tablet pressing with refiners

at present, the production of open mills in major industrial countries in the world has already formed a series, with roughly similar specifications, dimensions and shapes. Since the 1990s, the improvement of the open mill in China has mainly been to improve the degree of mechanization, increase safety operation measures, improve labor conditions and reduce the floor area

at present, some major domestic manufacturers have made a lot of improvements to the open smelting mechanism, such as setting the deceleration system in the left and right brackets, installing it under the receiving tray, setting the turnover device on the rack, adopting the hydraulic adjusting roll distance and hydraulic safety device, minimizing the self weight and floor area of the equipment, and striving to improve the service life of the equipment. At present, the domestic open mill has also formed a complete series with complete varieties and specifications, which can fully meet the requirements of users in all aspects. For example, Dalian Bingshan rubber and Plastic Co., Ltd. took the lead in completing the series modification development of the open mill. The rollers and bearings of the open mill adopt double row self-aligning roller bearings. All transmission gears are concentrated in a closed box, with compact structure, high transmission efficiency and good lubrication conditions. The roller distance adjustment can be monotonous or double adjusted at the same time, which is convenient and free to operate. In order to reduce the vibration of the machine, the machine body and reducer are installed separately, and nylon rod pin universal coupling is used. This kind of machine has reached the international advanced level and won the favor of users at home and abroad

1.2 internal mixer

internal mixer, also known as closed plasticizer, is mainly used for mixing plastics and other materials. For the above purposes, the internal mixer can completely replace the open mill, and the production efficiency and automation level are greatly improved, and the working conditions are improved. At present, the production of internal mixer in major industrial countries in the world has formed a series, which basically has four types:

(1) F series internal mixer represented by benbury type produced by Farrell Birmingham company in the United States

(2) Werner, Germany? GK series internal mixer represented by products of Pfizer

(3) take English Francis? K series internal mixer represented by products of Xiao company

(4) ms series pressurized internal mixer represented by the products produced by Moriyama, Japan

Since the 1990s, these four types of internal mixer have been developing towards the direction of fast, high pressure, large capacity and automation of feeding and operation procedures, and are controlled by microcomputer. In general, the basic structures of the first three series of internal mixer are similar, and the main difference lies in the configuration of rotor and the structure of internal mixer chamber. The main structure of the fourth MS series has great changes compared with the first three series. In terms of time sequence, the latter has not only reference and inheritance, but also improvement and innovation for the former. In the competition in the international market, they have not only mutual absorption, but also self-improvement and development, with their own characteristics

the internal mixer produced in China basically belongs to F series, GK series and MS series. Its technical parameters and main performance are equivalent to the above three series, and its shape is also very similar, but its specifications are incomplete, and a complete series has not been formed

pressure kneaders are widely used in small and medium-sized plastic factories in the world. It has no lower top bolt, so the installation of the universal experimental machine is a headache for users. The internal mixing chamber is used for overturning and discharging, and the floor area is small. It can be installed on the ground, saving engineering costs. The pressurized kneading machine has formed a complete series in Japan, with the minimum total volume of the internal mixing chamber of 1l, the total volume of the kneading chamber of 3l, and the maximum total volume of the internal mixing chamber of 500L, a total of 27 specifications

1.3 injection molding machine

injection molding machine is one of the main varieties of plastic machinery, accounting for 38% of the total output value of plastic machinery, and 1/3 of plastic products are produced by injection molding machines

at present, there are many manufacturers of injection molding machines in China, and according to incomplete statistics, there are more than 60. There are two structural forms of injection molding machine, vertical and horizontal. According to the products produced, they can be divided into ordinary and precision injection molding machines. One time injection volume g; Clamping force kn; Processing raw materials include thermosetting plastics, thermoplastics and rubber. Thermoplastics include polystyrene, polyethylene, polypropylene, nylon, polyurethane, polycarbonate, plexiglass, polysulfone and (acrylonitrile/butadiene/styrene) copolymer (ABS). From the processed products, there are monochrome, two-color general and precision plastic products. The main manufacturers of the above products have their own series, each with its own characteristics. For example, Jieba CJ series injection molding machines produced by Guangdong Zhende Plastic Machinery Factory Co., Ltd. have two forms of numerical control and computer control for each specification. Another example is the htf80x-hft3600x series injection molding machine produced by Ningbo Haitian Machinery Co., Ltd. in Zhejiang Province, which can be used to produce all kinds of high-precision thermal plastic products. The machine uses linear mobile sensors to control injection, mold closing and ejection, and adopts multiple CPU electric control systems. Strict regulatory requirements ensure the safety of this utilization field, large format color LED display and full computer automatic control

ordinary horizontal injection molding machine is still the leading direction of the development of injection molding machine, and its basic structure has almost no major changes. In addition to continuing to improve its control and automation level and reduce energy consumption, manufacturers are developing in the direction of combination serialization according to the changes of the market. As the same model of injection molding machine is equipped with three kinds of injection devices, large, medium and small, which are combined into standard and combined types, which increases flexibility and expands the scope of use, Improved economic benefits. In recent years, injection molding machine manufacturers in industrialized countries in the world are constantly improving the function, quality, supporting capacity of auxiliary equipment and automation level of ordinary injection molding machines. At the same time, we will vigorously develop large-scale injection molding machines, special injection molding machines, reaction injection molding machines and precision injection molding machines to meet the needs of producing plastic alloys, magnetic plastics and plastic products with inserts

injection molding machine is one of the plastic machines with the fastest development speed in China and a small gap between the level and the industrial developed countries. However, it mainly refers to ordinary injection molding machines. In most varieties of super large, special, special and precision injection molding machines, some products are still blank, which is the main gap with industrial developed countries

1.4 extruder and auxiliary machine (production line)

extruder is also one of the main varieties of plastic machinery, accounting for 31% of the total output value of plastic machinery, and the plastic products processed by extruder account for about 1/3 of its total

single screw extruder plays an important role as both plasticizing and granulating machinery and molding and processing machinery. In recent years, single screw extruder has made great development. At present, the large-scale manufacturing in Germany, Beijing University of chemical technology, in cooperation with Beijing Institute of Aeronautical Manufacturing Engineering and Hangzhou Chaoyang Rubber Co., Ltd., has a single screw extruder for pellets, with a screw diameter of 700mm and a production of 36t/h

The main mark of the development of single screw extruder is the development of its key part screw. In recent years, people have carried out a lot of theoretical and Experimental Research on screws. So far, there are nearly 100 kinds of screws, including separation type, shear type, barrier type, shunt type and wavy type

from the perspective of the development of single screw, although the single screw extruder has been relatively perfect in recent years, with the continuous development of polymer materials and plastic products, more characteristic new screws and special single screw extruders will emerge. In general, the single screw extruder is developing towards high speed, high efficiency and specialization

twin screw extruder has good feeding characteristics, is suitable for powder processing, and has better mixing, exhaust, reaction and self-cleaning functions than single screw extruder. It is characterized by its advantages in processing plastics and blends with poor thermal stability. In recent years, foreign twin-screw extruders have been greatly developed. Various forms of twin-screw extruders have been serialized and commercialized, and there are many manufacturers. They are roughly classified as follows:

(1) according to the relative position of the two axes, there are parallel and conical

(2) according to the meshing procedure of two screws, there are meshing type and non meshing type

(3) according to the rotation direction of the two screws, there are the same direction and different direction, and there are inward and outward in the different direction; □

(4) according to the screw rotation speed, there are high-speed and low-speed

(5) according to the structure of screw and barrel, there are integral and combined

on the basis of twin-screw extruders, some manufacturers have developed multi screw extruders, such as planetary extruders, in order to process blends with poor thermal stability more easily

China's twin-screw extruder has incomplete product series and few specifications. Many plastics in China

Copyright © 2011 JIN SHI