The annual output of rubber extruders in China is nearly 8 0 0, and there are about 50 manufacturers, mainly distributed in Qingdao, Guilin, Inner Mongolia, Shanghai and other places. Although there are many rubber screw extruder manufacturers in China. But only 4-5 companies have the ability to develop and design, which is quite influential in the industry. For example, Guilin Rubber Industry New Technology Development Company, Tianjin Saixiang Technology Co., Ltd., Inner Mongolia Fute Rubber & Plastic Machinery Co., Ltd., Inner Mongolia Honglida Rubber & Plastic Machinery Co., Ltd., etc ... In the mid-1980s, China began to contact and use the ternary composite extrusion technology and binary composite extrusion technology of B ET-S T O R F and T O E S T ER. Inner Mongolia Fute Rubber & Plastic Machinery Co., Ltd. has conducted technical exchanges with many foreign companies in recent years. On the basis of absorbing foreign advanced technology, the pin-type cold-feed compound extruder with various specifications was developed and produced, which made the compound extrusion equipment localized and made the technology reach a relatively mature level. In recent years. This company has provided * 200/250 double compound pin cold feed extruder for Beijing Tire Factory, 0.1.201.501.200 triple compound pin cold feed extruder for Hefei Tong Jia Tire Company, and recently provided several pin cold feed extruders with different specifications for Vietnamese and Taiwanese tire factories.
In the production of sealant tape, three-compound die and four-compound die have also developed rapidly. Most of the compound heads of the sealing rubber strip production line introduced earlier in China are equipped with shearing heads, and the structure of the heads is complicated. After years of development, the three-compound and four-compound heads used now are quite simple in structure and have good use effect, so the shear head is no longer used. With the development of domestic composite extrusion equipment, composite extrusion technology and production technology will develop rapidly. In recent years, Inner Mongolia Fute Rubber & Plastic Machinery Co., Ltd. has designed and produced L-shaped roller-head pin-type cold feed extruder, which has been applied in the production of conveyor belt covering film and radial tire lining film. Its biggest feature is that it combines many advantages of calender and extruder, and the extruded film has good air tightness, which simplifies the production process, reduces production equipment, reduces a lot of energy consumption and improves product quality.
It is reported that at present, some domestic composite extrusion equipment can completely replace imported equipment. The medium-l 5 0 cold /~ 250 hot compound rubber extruder developed by Guilin Rubber Industry New Technology Development Corporation has greatly improved the rubber conveying capacity and the extrusion capacity reaches 4200 kg/h due to the adoption of the new structure screw. The extrusion tread speed with specifications below 1 1 O O is between 1 6 and 22 m/rein, which is about1times higher than that of most similar imported equipment. The ~ 120/200/2 5 0 cold feed ternary compound extruder developed by it is the first ternary compound extrusion equipment used to produce all-steel tires in China. China Chemical Guilin Engineering Company has also successfully developed a four-compound extrusion unit, which has reached or approached the advanced level abroad and has been used for sidewall extrusion of radial tires produced by Michelin Company. The unit is worth10 million yuan, and it is a production line specializing in producing all kinds of high-grade radial tires. This set of equipment is a colossus with a length of 100 meter. Only one head of the extrusion unit weighs 2 3 tons, and only a few manufacturers in the world can provide similar products. The localization of advanced equipment is conducive to the promotion of new equipment and technologies, improving the equipment level of enterprises and promoting production development. Especially due to the rapid development of radial tire production in China in recent years and the advantages of pin-type cold feed extruder, the popularization of pin-type cold feed extruder has greater advantages, and it has become a substitute product for hot feed extruder and ordinary cold feed extruder, providing a broad development and application prospect for pin-type cold feed extruder.
With the appearance and wide application of cold feed extruder, the application range of hot feed extruder is gradually reduced. Rubber extruder has developed from hot feed to cold feed, and cold feed pin extruder has become the mainstream of development. At present, pin extruder has been widely used in China's rubber industry, involving tire tread, radial tire sidewall, bead rubber, various hoses and lining film. The machine platform used is imported from China, with a screw diameter of 85 ~ 250 m and an aspect ratio of 1.2 ~ 1.6. Compared with hot feed extruder and common cold feed extruder, pin cold feed extruder has many advantages. In recent ten years, it has been widely used in China's rubber industry, and its uses have been expanding. The needle-type cold feed extruder introduced in China in the early days is mainly used for the rubber core and rubber coating production process of radial tire tread rubber extrusion and rubber hose production. At present, most semi-steel and all-steel tire treads are produced by pin cold feed extruder. In the production process of rubber products such as bias tires, many manufacturers have adopted pin-type cold feed extruder. In the production of rubber industry, the traditional production process is to use extruder as molding extrusion equipment, while the pin-type cold feed extruder is widely used for rubber supply for steel wire, fiber cord calendering and airtight film calendering because of its large extrusion capacity and good plasticizing effect. In recent years, pin-type cold feed extruder is also widely used in rubber filtration, which is well received by users.
Pin-type cold feed internal compound extruder has also been widely used in radial tire production and has become the key equipment in radial tire production. Although some enterprises still use external compound extrusion technology in production, with the improvement and update of new technology and new process and the development of market economy, the old production technology and equipment will be eliminated, and internal compound extruder is the inevitable development direction of compound production technology.
However, at present, hot feed extruders still account for a large proportion in China's rubber industry production enterprises. According to incomplete statistics, about 70% of the production process of hot-feed extrusion with rubber supplied by an open mill is used in China. Many old rubber production enterprises in China use extrusion equipment from 1950s, and the technical equipment is backward. Some enterprises think that the old extrusion equipment has certain advantages, such as the good dispersion of the mixed rubber in the open mill, good operability and skilled operators, but the advantage of the pin cold feed extruder is greater than that of the hot feed extruder. Pin cold feed extruder stands for rubber.
The development direction of extruder has great development potential. It can be seen that there is still a lot of room for further popularizing the use of pin-type cold feed extruder in the technological transformation of extrusion process in rubber production enterprises in China.
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