First, the working principle of rubber extruder
The rubber extruder completes all the above processes through the barrel with screw and spiral channel. Plastic particles enter the barrel through the hopper at one end of the barrel, and then are conveyed to the other end of the barrel through the screw. In order to have enough pressure, the thread depth on the screw decreases with the increase of the distance to the hopper. The external heat and internal heat generated by the friction between plastic and screw provide us with work!
Second, classification
1, plunger type
Extruder originated from18th century. In 1795, JosephBramah of Enger made a manual piston extruder for manufacturing seamless lead pipes, which is considered to be the first extruder in the world. From then on, in the first 50 years of the19th century, the extruder was basically only used for the production of lead pipes, the processing of macaroni and other foods, brick making and ceramic industry.
Step 2 spiral
The rubber extruder in 1870 is a hot-feed extruder. The rubber material it feeds must be heat-refined, and the feeding is uniform, stable and constant, and the material temperature is kept at 50 ~ 70℃. Its screw is short, the thread groove is deep, and the homogenization effect is not ideal. Since the 1970s. At one time, the aspect ratio became smaller. Hot-feed extruder is still used in the production of many products because of its advantages of continuous extrusion, simple operation, high production efficiency and stable shape of extruded products. It is used for the extrusion of various treads and rubber types in tire production, as well as the extrusion of rubber coatings and rubber blanks in the production of rubber hoses, cables and other rubber products.
3. Common types
Cold feed extruder appeared in 1940s, became popular in 1960s, and became the mainstream in 1980s. By the early 1990s, the products produced by cold-feed extruders in developed countries such as Europe and America 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 multichannel transfer mixing screw (MCT) extruders.
Do you know anything about rubber extruder now? The working principle of rubber extruder is simple and the operation is simple. But pay attention to safety. Rubber extruders can be divided into many types, including plunger type, screw type and ordinary type. The working principles of different rubber extruders are different and need to be distinguished. Rubber extruder first appeared in18th century. This kind of equipment is widely used in some rubber products manufacturers and can be used to make all kinds of rubber products.