The extruder first appeared in the 18th century, and the manual piston extruder made by Joseph Bramah of Inge in 1795 for making seamless lead pipes is considered to be the world's first extruder. From then on, for the first 50 years of the 19th century, the extruder was basically only used in the production of lead pipes, the processing of macaroni and other foods, the brick making and the ceramic industry.
The rubber extruder that appeared in 1870 was the hot feed extruder. The rubber material it feeds must be hot-smelted, and the feeding is uniform, stable and constant, and the material temperature is kept at 50-70 °C. However, the hot feed extruder has a short screw and a deep thread groove, and the homogenization effect is not ideal. Since the 1970s, there has been a phenomenon that the aspect ratio has become smaller. However, because the hot-feed extruder can continuously extrude rubber, the operation is simple, the production efficiency is high, and the shape of the finished product after extrusion is stable, so the hot-feed extruder is still used in the production process of many products.
The hot feed extruder is used in the production of tires for the extrusion of various treads and rubber profiles, and for the extrusion of lagging and rubber blanks in the production of rubber hoses, cables and other rubber products.
The cold feed extruder appeared in the 1940s, was promoted and popularized in the 1960s, and gradually became the mainstream of development in the 1980s. By the early 1990s, products produced by cold-feed extruders in developed countries such as Europe and the United States accounted for 95% of the total production.
Rubber extruders include separate screw extruders, baffle screw extruders, cavity screw extruders, transfer mixing extruders, pin screw extruders and multi-channel transfer mixing screws (MCT) extruder etc.
