There are many rubber products in our lives. The car tires we usually see are made of rubber, and many of the products we usually see are made of rubber. Many products can be completed at once, and they are also common in our lives. Some shoe soles are also made of rubber. When processing rubber, a rubber extruder is required. The rubber extruder is a kind of equipment used for extrusion. Now we come to understand the working principle and classification introduction of rubber extruder .
- Working principle of rubber extruder
The rubber extruder completes all the above processes through a barrel with a screw and a spiral channel. The plastic particles enter the barrel through the funnel at one end of the barrel, and then are conveyed to the other end of the barrel through the screw. In order to obtain sufficient pressure, the thread depth on the screw will decrease as the distance from the hopper increases. The external heat and internal heat generated by the friction between the plastic and the screw provide us with work!
Two, classification
Plunger type
Since then, in the first 50 years of the 19th century, rubber extruders were basically only used for the production of lead pipes, macaroni and other food processing, brick and ceramic industries.
- Screw type
The rubber extruder that appeared in 1870 was a hot feed extruder. The rubber material sent in must be hot melted, and the material must be supplied uniformly and stably at a constant speed, and the material temperature must be maintained at 50-70°C. The screw is short, the thread groove is deep, and the homogenization effect is not ideal. Since 1970. At one time, the aspect ratio became smaller. Because the hot-feed extruder can continuously extrude, the operation is simple, the production efficiency is high, and the shape of the extruded product is stable, the hot-feed extruder is still used in the production process of many products. In the production of tires, it is used to extrude various treads and various types of rubber, as well as extruding rubber and rubber blanks in the production of hoses, cables and other rubber products.
- Ordinary
The cold feed extruder appeared in 1940, and began to be promoted and popularized in 1960, and became the mainstream of development in 1980. By the beginning of 1990, products produced by cold feed extruders in developed countries such as Europe and the United States accounted for 95% of the total output. There are separate screw extruders, baffle screw extruders, cavity screw extruders, transfer mixing extruders, pin screw extruders and multi-channel transfer mixing screw (MCT) extruders, etc. .
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