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Introduction to Rubber Extruders

Time：

2020-08-15

Rubber extruders play a crucial role in the extrusion production of rubber products, with many such items being manufactured using this equipment. When selecting a rubber extruder, it is essential to consider both the type and model of the product, choosing one that best suits your specific application. Common products made on rubber extruders include rubber strips, rubber hoses, sealing strips, and rubber sheaths; different products require different types of extruders. For instance, some applications call for vacuum‑vented extruders, while others necessitate pin‑type extruders. Extrusion molding is just one of the most frequent uses of rubber extruders, typically carried out with cold‑feed extruders. In addition to cold‑feed extruders, there is another category—hot‑feed extruders—classified according to the feeding method employed by the machine.

A hot-feed rubber extruder can be used for pre‑forming extrusion of products and for filtering reclaimed rubber—what we commonly refer to as a rubber filtration machine. When employed as a filtration unit, hot-feed rubber extruders are typically larger‑sized models, such as the 200‑type rubber filtration extruder. This is because, when used to filter rubber, the required extrusion output is substantial, necessitating a correspondingly larger extruder model.

Working principle of a rubber extruder

Extrusion molding is a manufacturing process in which a plasticizable compound is continuously forced through a die under specific conditions, thereby producing a product with a defined cross-sectional shape.

As the rubber compound advances along the screw, mechanical and thermal effects cause changes in its viscosity and plasticity, transforming it into a viscous fluid. Based on the material’s behavior during extrusion, the working section of the screw is typically divided into three distinct zones—feeding, compression, and metering—each serving a specific function.

Features of Rubber Extrusion Equipment

Suitable for extruding rubber compounds (EPDM, natural rubber, nitrile rubber, butyl rubber, and reclaimed rubber), it is used in the production of composite sealing strips for architectural doors and windows, single‑extruded sealing strips, as well as various dense and foamed rubber products—such as strip‑shaped, bar‑shaped, tubular, and sheet‑like items—for applications in construction, electrical appliances, machinery, water conservancy, and other fields.

Cold-feed rubber sealing strip extruder: This is a type of equipment that uses cold rubber in the production process, typically employing forced cold feeding. Cold-feed rubber extruders are characterized by high production efficiency and stable operation. Extruders are commonly used to manufacture products such as sealing strips and rubber hoses, which can be produced via extrusion. An extruder is a rubber‑processing machine designed for extruding tire treads, inner tubes, rubber hoses, and various rubber profiles.

Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. is a modern enterprise integrating R&D, manufacturing, and sales of complete sets of extrusion equipment for rubber, silicone, and plastics. The company’s main products include rubber extruders, rubber hose extrusion lines, three‑layer composite sealing strip extrusion lines, silicone sealing strip production lines, plastic sealing strip production lines, plastic profile extrusion lines, plastic pipe extrusion lines, elastomer extruders, and other extrusion equipment, as well as production machinery for engineering seals, automotive seals, wire and cable applications, air‑conditioning hoses, braided hoses, automotive hoses, waterstop strips, and related products.