The production situation of domestic rubber extruders
The annual output of rubber extruders in my country is nearly 800 units, and there are about 50 manufacturers, mainly distributed in Qingdao and Guilin , Inner Mongolia, Shanghai and other places. Although there are many domestic rubber screw extruder manufacturing companies. However, there are only 4-5 companies that have development and design capabilities and are influential in the industry. Such as Guilin Rubber Industry New Technology Development Industrial Corporation, Tianjin Saixiang Technology Co., Ltd., Inner Mongolia Fute Rubber and Plastic Machinery Co., Ltd. and Inner Mongolia Honglida Rubber and Plastic Machinery Co., Ltd., etc. In the mid-1980s, China began to come into contact with and use the three-compound extrusion technology and dual-compound extrusion technology of Bet-storff Company and Troester Company. Inner Mongolia Fute Rubber and Plastic Machinery Co., Ltd. has conducted technical exchanges with many foreign companies in recent years. On the basis of absorbing advanced foreign technology, it has developed and produced pin-type cold-feed compound extruders of various specifications, making compound extrusion equipment Nationalization has been achieved and the technology has reached a relatively mature level. in recent years. The company provided a *200/250 double composite pin cold feeding extruder for the Beijing Tire Factory and a *200/250 double composite pin cold feeding extruder for the Hefei Giti Tire Company. 1 2 0 / 1 5 0 / 1 2 0 three-compound pin-type cold-feeding extruder. Recently, we have provided multiple pin-type cold-feeding compound extruders of different specifications to Vietnamese and Taiwanese tire factories.
In the production of sealing strips, three-composite machine heads and four-composite machine heads have also developed rapidly. Most of the composite heads of the sealing strip production lines introduced earlier in China are equipped with shearing heads. The structures of the heads are relatively complex. After years of development, the three-composite and four-composite heads now in use are quite simple in structure and have good use effects. No more cutting heads. With the development of domestic composite extrusion equipment, composite extrusion technology and production processes will develop rapidly. In recent years, Inner Mongolia Fute Rubber and Plastic Machinery Co., Ltd. has independently designed and produced a pin-type cold-feed extruder equipped with an "L"-shaped roller head. It is currently used in the production process of conveyor belt covering rubber sheets and the air-tight sealing of radial tires. It is applied in the production of layer film. Its biggest feature is that it combines many advantages of the calender and the extruder. The extruded film has good air tightness, simplifies the production process, reduces the production equipment, reduces a lot of energy consumption, and improves the product quality.
According to reports, some domestic composite extrusion equipment can completely replace imported equipment. The medium 150 cold/~250 hot dual compound extrusion unit developed by Guilin Rubber Industry New Technology Development Industrial Corporation has greatly improved the rubber conveying capacity due to the use of a new structural screw, and the extrusion volume has reached 4200 k g/h; The speed of extruding treads with specifications below 1 1.0 O is between 1 6 and 2 2 m/rain, which is about 1 times higher than the indicators of most similar imported equipment. The ~120/200/250 cold-feed tri-compound extrusion unit developed by it has become the first tri-compound extrusion equipment in China for the production of all-steel tires. China National Chemical Industry Guilin Engineering Company has also successfully developed a four-compound extrusion unit, which has reached or approached the advanced foreign level and has been used for sidewall extrusion of radial tires produced by Michelin. This unit is worth tens of millions of yuan and is a production line specializing in the production of various high-end radial tires. This set of equipment is a behemoth that is 100 meters long. Only one head of the extrusion unit weighs 23 tons. 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 China's radial tire production in recent years and the advantages of pin-type cold feed extruders, The popularization and application of pin-type cold-feed extruders has greater advantages and has become a replacement product for hot-feed extruders and ordinary cold-feed extruders, providing broad development and development opportunities for pin-type cold-feed extruders. Application prospects.
With the emergence and widespread application of cold-feed extruders, the application scope of hot-feed extruders is gradually narrowing.
Rubber extruders have developed from hot feeding to cold feeding, and cold feeding pin extruders have become the mainstream of development. At present, pin-type extruders have been widely used in China's rubber industry, involving tire treads, radial tire sidewalls, bead rubber, various rubber hoses and inner lining films, etc. The machines used are both imported and domestically produced, with screw diameters ranging from 85 to 250 mm and aspect ratios of 12 to 16. Pin type cold feed extruders have many advantages over hot feed extruders and ordinary cold feed extruders. In the past ten years, it has been widely used in my country's rubber industry production, and its uses have been continuously expanded. The pin-type cold-feed extruder introduced early in the country is mainly used for radial tire tread rubber extrusion and rubber core and rubber coating production processes in rubber hose production. Most of today's semi-steel and all-steel radial tire treads are produced using pin-type cold-feed extruders. In the production process of bias tires and other rubber products, many manufacturers use pin-type cold feed extruders. In the rubber industry production, the traditional production process is the extruder as the molding and extrusion process equipment. The pin-type cold feed extruder has been widely used for steel wire and fiber cord calendering due to its large extrusion volume and good plasticizing effect. The glue is supplied to the machine and the airtight layer film calender. In recent years, pin-type cold-feed extruders have also been promoted for filtering glue and have been well received by users.
Pin-type cold-feed internal compound extruders have also been widely used in radial tire production and have become key equipment for radial tire production. Although some companies still use external compound extrusion processes in production, However, with the improvement and update of new technologies and new processes, as well as the development of the market economy, old production processes and equipment will be eliminated. Internal compound extruders are the inevitable development direction of compound production processes.
However, at present, hot-feed extruders still account for a large proportion of China's rubber industry production enterprises. According to incomplete statistics, the hot feed extrusion production process using open mills to supply glue accounts for about 70% in China. Many old rubber production companies in my country use extrusion equipment, processes and equipment from the 1950s. behind. Some companies believe that old extrusion equipment has certain advantages, such as good rubber dispersion in open mills, good operability, and skilled operators. However, the advantages of pin-type cold-feed extruders are greater than those of hot-feed extruders. Out of the machine. The pin-type cold-feed extruder represents the development direction of rubber extruders and has great development potential. It can be seen that there is still a lot of room for the technological transformation of the extrusion process in my country's rubber production enterprises and the further promotion of the use of pin-type cold feed extruders.
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