Classification of Rubber Extruders

1. Plunger rubber extruder

The plunger rubber extruder originated in the 18th century, and the manual piston extruder for making seamless lead pipes made by Joseph Bramah in England in 1795 is considered the world's first extruder. Since then, within the first 50 years of the 19th century,

Extruders are basically only used in lead pipe production, macaroni and other food processing, brick making and ceramic industries.

2. Screw type rubber extruder

The rubber extruder that appeared in 1870 was a 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. The screw is short, the thread groove is deep, and the homogenization effect is not ideal.

from the 1970s. There was a phenomenon that the aspect ratio became smaller. Because the hot-feed extruder can continuously extrude, simple operation, high production efficiency, and stable shape of the extruded product, the hot-feed extruder is still used in the production process of many products.

In the production of tires, it is used for the extrusion of various treads, various types of rubber, and in the production of rubber hoses, cables and other rubber products for the extrusion of rubber and rubber blanks.

3. Ordinary rubber extruder

The cold feed extruder appeared in the 1940s, began to be promoted and popularized in the 1960s, and became the mainstream of development in the 1980s. to the early 1990s. The products produced by cold feed extruders in developed countries such as Europe and the United States have accounted for 95% of the total production. There are separate screw extruders,

Baffle screw extruder, cavity screw extruder, transfer mixing extruder, pin screw extruder and multi-channel transfer mixing screw (MCT) extruder, etc.

4. Cold feed rubber extruder

The emergence of the cold-feed vented extruder originated from the design of the vacuum extruder screw proposed by Bernhatd in 1956. The screw used in it can be divided into ordinary type cold discharge screw and strong shear type cold discharge screw according to the flow state in the screw groove of the narrow compression section of the rubber compound.

The screw of the cold feed vent extruder is divided into a feeding section, a compression section/throttle section, a vent section and an extrusion section. The throttling section adopts shallow grooves and equal-distance and equal-depth threads, which can make the rubber material obtain higher shearing and stable conveying process, and also improve the exhaust effect.

5. Pin type rubber extruder

In the continuous exploration of extrusion technology, research on pin technology began in the late 1960s and early 1990s. The pin is inserted radially into the screw thread groove from the circumferential direction of the barrel to shear the flowing rubber. and stir.

The rubber material becomes a melt and flows in the screw thread at a low shear rate, gradually forming a continuous viscous fluid, which destroys the laminar flow and agglomeration of the rubber material during the extrusion process, breaks the rubber block, and achieves The effect of good plasticization, low glue temperature and energy saving simplifies the production process.

6. Compound rubber extruder

In the rubber industry, the compound extruder is mainly used for the extrusion of tire compound tread, automobile sealant strip, colored tire tread, rubber hose compound and plastic compound extrusion, and multi-layer co-extrusion of rubber sheet.

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