Applications and Usage of Rubber Extruder Heads

We often confuse the terms “rubber extruder head” and “rubber extruder die.” In fact, both refer to the extruder itself, whereas the die is merely a component of the extruder. During production, the rubber extruder performs the extrusion‑molding function: the raw rubber is fed into the screw via the feeder, and the screw then processes it. The extruder barrel serves as the processing chamber, while the screw acts as the tool that shapes the rubber. Because the extruder plays a crucial role in shaping rubber products, many such products are formed at the very first station of the production line; hence, we frequently call this section the “extruder head” or “extruder die.” Inside the barrel, the rubber undergoes shearing, compression, mixing, and other forms of processing before being forced through the die to produce the desired final product. Thus, the die also contributes significantly to the extrusion‑molding process. As the interface between the mold and the barrel, the die is an essential part of the entire system. Rubber extruders can manufacture a wide variety of products—such as sealing strips, rubber hoses, and rubber cables—making them highly versatile. In practical applications, in addition to extruding finished parts, rubber extruders are also used for filtering reclaimed rubber; common rubber‑filtering machines are, in essence, a type of extruder.

1. Working Principle

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 main zones—feeding, compression, and metering—each serving distinct functions.

2. Cold-feed extrusion

Advantages: It saves on hot‑melt processing equipment, facilitates mechanization and automation, and, thanks to the main unit’s enhanced screw shear and plasticizing action, ensures uniform temperature and plasticity of the compound. It also improves the quality of extruded products, enhances surface finish, and produces semi‑finished extrudates with more stable and consistent dimensional tolerances. Furthermore, cold‑feed extrusion is less sensitive to pressure fluctuations and offers greater operational flexibility, while requiring lower capital and production costs.

3. Equipment Features

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 a wide range of solid 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 industries.

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 tread compounds, 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 production lines, plastic pipe production lines, elastomer extruders, and other extrusion machinery, as well as production equipment for engineering seals, automotive seals, wire and cable applications, air‑conditioning hoses, braided hoses, automotive hoses, waterstop strips, and related products.