There are about 22 foreign manufacturers of rubber extruders, including Germany Trost, belstov, Krupp, A-Z (VMI), Japan Nakata engineering, Mitsubishi Heavy Industry, Kobe machinery, Kobe Steel, Jinzhong machinery, American Farrell and Davis standards, Italy POMINI, Switzerland RCM and IMTE RPLA STI -C A, I d o r b r o t h e r and other companies in UK. Founded in 1892, telost Machinery Factory is mainly engaged in the development and manufacturing of tires, cables, sealant strips, conveyor belts and other mechanical equipment. The screw type rubber extruder (GS) produced by the company is used by the main rubber processing plants in Europe and other countries. In the past century, the output and quality of its rubber extruder have been recognized as the industry standard. In the middle of 1970s, Trost company played an important role in the development of QSM (transverse flow stirring) process, and developed QSM pin type cold feed extruder. Since then, this continuous development of technology enables tire manufacturers and other rubber products processors to process a variety of rubber compounds with the best plasticizing effect without replacing the screw, with high yield and good quality. Because QSM pin type cold feed extruder is suitable for all rubber materials. Therefore, it has been rapidly promoted to various industries of rubber industry.

 

 

Belstov rubber and Plastic Machinery Co., Ltd., founded 100 years ago, is a member company of Mannesmann plastic machinery group company. As a leading supplier of rubber and plastic equipment, belstov has become one of the world's leading manufacturers of plastic and rubber production, processing and extrusion systems. Belstov established its first technical center in 1954, developed and manufactured its first twin-screw extruder in 1966, and merged into Mannesmann plastics machinery group in 1898. It provides extruder and extrusion system, compound extrusion system, roller head extrusion system and calender production line for tire manufacturing industry. The products produced by its two compound, three compound and four compound extrusion systems include tread, sidewall rubber strip and Triangle rubber strip. Due to the highly standardized components, the series of twin-screw extruders of zbasic produced by the company have excellent performance price ratio. The new model is especially suitable for general mixing modification. With the launch of the new Z EBAS IC model, the company has completed a full range of twin-screw extruders, including ultra-high performance Z EUT X and Z EUT twin-screw extruders. Zybasic twin screw extruder will be popularized all over the world.

 

In 2004, VMI, the Dutch rubber machinery manufacturer, bought out the extruder Department of A-Z model and Machinery Manufacturing Co., Ltd., which expanded its product range. This event expanded the product range of VMI in tire forming and rubber industry. A-Z extrusion products include multi compounding extruder, triple compounding extruder and quadruple compounding extruder. The extrusion capacity ranges from 60kg / 60ram to 7800ks / 250ram per hour.

 

In general, cold feed rubber extruders have become the mainstream of the developed countries such as Europe and America. By the early 1990s, cold feed rubber extruders in developed countries such as Europe and America accounted for 95% of the total production. At present, developed countries such as Europe and America are developing and producing mtcd and other high-speed and precision new extrusion equipment.

 

Production situation of rubber extruder in China

 

The annual output of Rubber Extruders in China is nearly 800, 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. However, only 4-5 companies have the ability of development and design and have a great influence in the industry. Such as Guilin rubber industry new technology development Industrial Corporation, Tianjin Saixiang Technology Co., Ltd., Inner Mongolia Fute Rubber Machinery Co., Ltd. and Inner Mongolia honglida Rubber Machinery Co., Ltd. In the middle of the eighties, China began to contact and use the triple compound extrusion technology and double compound extrusion technology of bt-storf company and tro-stor company. In recent years, Inner Mongolia Fute rubber and Plastic Machinery Co., Ltd. has carried out technical exchanges with many foreign companies. On the basis of absorbing foreign advanced technology, it has developed and produced pin type cold feed composite extruders of various specifications, which has made the composite extrusion equipment localized and made the technology mature. In recent years. The company has provided * 200 / 250 double composite pin cold feed extruder for Beijing tire factory, and. 120 / 150 / 120 triple composite pin cold feed extruder for Hefei Jiatong tire company. Recently, it has provided several pin cold feed composite extruders with different specifications for Vietnam and Taiwan funded tire factories.

 

In the production of sealant strip, three compound die and four compound die also get rapid development. Most of the compound heads of sealant production lines introduced earlier in China are equipped with shear heads. The structure of the heads is relatively complex. After years of development, the structure of the three compound and four compound heads used now is quite simple, and the use effect is good. Shear heads are no longer used. With the development of domestic compound extrusion equipment, the compound extrusion technology and production process will develop rapidly. In recent years, Inner Mongolia Fute rubber and Plastic Machinery Co., Ltd. has designed and produced a pin type cold feed extruder with "L" type roller head, which has been applied in the production process of conveyor belt covering rubber film and the production of radial tire inner liner film. Its biggest characteristic is that it synthesizes many advantages of calender and extruder, the air tightness of extruded film is good, the production process is simplified, the production equipment is reduced, a lot of energy consumption is reduced, and the product quality is improved.

 

It is reported that at present, some domestic composite extrusion equipment can completely replace the imported equipment. The zhongl50 cold / ~ 250hot double compound extruder developed by Guilin rubber industry new technology development Industrial Corporation has greatly improved the rubber conveying capacity and reached 4200kg / h due to the adoption of new screw structure. The tread speed of extrusion under 11.0 is between 16-22 M / R A in, which is about one time higher than that of most similar imported equipment. The 120 / zhong200 / zhong250 cold feed tri compound extruder developed by the company has become the first tri compound extruder for all steel tire production in China. Guilin engineering company of China chemical industry has also successfully developed a four compound extruder, reaching and approaching the advanced level of foreign countries, which has been used in the sidewall extrusion of radial tire produced by Michelin company. The unit is worth tens of millions of yuan, is specialized in producing all kinds of high-grade radial tire production line. Only one head of the extruder 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 technology, the improvement of enterprise equipment level, and the promotion of 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 and application of pin type cold feed extruder has greater advantages, It has become a new product of hot feed extruder and common cold feed extruder, which provides a broad development and application prospect for pin type cold feed extruder.

 

Application status of foreign rubber extruder

 

In developed countries such as Europe and the United States, cold feed extruders are mainly used, and MCT extruders have entered the promotion stage. By the end of 1990s. Hundreds of MCT extruders have been put into use in the world, and more than 100 in North America are used for tire hot and cold turning. According to the introduction, the most advanced rubber extruder at present is a triple compound extruder designed by A-Z company of Germany, which is composed of mctd-90, mctd-150 and mctd-200. It is characterized by small volume and 20% energy saving. It is used for tire turning in North America. Although many advantages of MCT and MCTD extrusion technology are introduced in the developer's publicity, not all MCT extruders are successful. MCT 95 / 50 / 50 triple compound equipment was introduced in China, which was planned to be used for extruding the tread of power car, but it failed because of the uneven plasticization. According to the opinion of the German company, this kind of design is not successful.

 

With the emergence and wide application of cold feed extruder, the application scope of hot feed extruder is gradually narrowing. Rubber extruder has developed from hot feed to cold feed, and cold feed pin extruder has become the mainstream. At present, pin extruders have been widely used in China's rubber industry, involving tire tread, radial tire sidewall, bead compound, various rubber tubes and inner liner films, etc. The screw diameter is 85 ～ 250mm and the ratio of length to diameter is 12 ～ 16. Pin type cold feed extruder has many advantages over hot feed extruder and common cold feed extruder. In recent ten years, it has been widely used in the production of rubber industry in China, and its use has been expanding. The pin type cold feed extruder introduced early in China is mainly used for radial tire tread compound extrusion and rubber core and cladding production process in rubber tube production. At present, most of the semi steel and all steel radial tire tread are produced by pin type cold feed extruder. In the production process of bias tire and other rubber products, many manufacturers use pin type cold feed extruder. In the production of rubber industry, the traditional production process is extruder as extrusion process equipment. Pin type cold feed extruder has been widely used in steel wire, fiber cord calender and inner liner film calender for its large extrusion volume and good plasticizing effect. In recent years, the pin type cold feed extruder has also been widely used for filtering glue, and has been well received by users.

 

The development direction of extruder has great potential. It can be seen that there is still a lot of room for further popularization of pin type cold feed extruder in the technical transformation of extrusion process in China's rubber production enterprises.