In the production of sealing strips, the three composite heads and four composite heads have also developed rapidly. The composite heads of the sealing strip production line introduced earlier in China are mostly equipped with shearing heads. The structure of the head is relatively complicated. After years of development, the three-composite and four-composite heads used now are quite simple and have good effects. The cutting head is no longer used. With the development of domestically produced composite extrusion equipment, the composite extrusion technology and production process will appear to develop rapidly. In recent years, Hangzhou Jinlaier Electric Machinery Co., Ltd. designed and produced the pin-type cold feeding material of the "L" type roller head. Extruder, which has been produced in the conveyor belt cover film. Process and application in radial film production of radial tires. Its larger feature is the combination of the advantages of the calender and the extruder. The airtightness of the extruded film is good, the production process is simplified, the production equipment is reduced, a large amount of energy is reduced, and the quality of the product is improved.

    According to reports, some domestically produced composite extrusion equipment can completely replace imported equipment. The l50 cold/~ 250 hot double composite extrusion unit developed by Guilin Rubber Industry New Technology Development Industrial Corporation has greatly improved the rubber conveying capacity due to the new structure screw. The extrusion capacity reaches 4200kg/h; The tread speed is between 16 and 22 m/rain, which is about 1 times higher than that of most similar imported equipment. The developed ~120/200/medium 250 cold feed three composite extrusion unit became the first three composite extrusion equipment for all-steel tire production in China.

    China Chemical Industry Guilin Engineering Co., Ltd. has also successfully developed four compound extrusion units, which are close to foreign advanced level and have been used in the production of Michelin. The radial side of the radial tire is pushed out. The unit is worth 10 million yuan and is a production line specializing in the production of various types of high-terminal tires. The equipment is a behemoth of up to 100 meters, and only one head of the unit is up to 23 tons. Only a few manufacturers around the world can provide similar products. The localization of advanced equipment is conducive to the promotion of new equipment and technology, improve the equipment level of enterprises, and promote the development of production, especially due to the rapid development of the production of radial tires in China in recent years and the advantages of the pin-type cold feed extruder. The popularization and application of the cold feed extruder has a greater advantage, and has become a replacement product of the hot feed extruder and the ordinary cold feed extruder, which provides a broad development and application prospect for the pin type cold feed extrusion machine.