The rubber extruder head, or simply the extruder head, refers to the extruder itself. Since the extruder plays a crucial role in shaping rubber products through extrusion, it is typically positioned at the first station of an extrusion production line. Hence, it is called the rubber extruder head. So, what components make up a rubber extruder, and how is its structure configured? Fundamentally, a rubber extruder consists of the extruder barrel, the screw, and the overall machine frame. For rubber to enter the barrel, it passes through the feeding system; once fed into the barrel via the feed hopper, it undergoes heating and processing by the screw. The screw’s rotation requires both a transmission unit and a power source—namely, a reducer and an electric motor. During production, temperature control of the barrel and screw is essential. Consequently, the temperature‑control subsystem is also part of the extruder. Modern rubber extruders commonly use mold‑temperature controllers to regulate operating temperatures, so this temperature‑control function is fulfilled by such units. The extruder barrel and screw are supported by the machine frame and connected to the gearbox at the rear. Power is transmitted via a belt drive that operates the reducer, while the motor is usually mounted beneath the machine, adjacent to the mold‑temperature controller. In addition, the extruder includes an intelligent electrical control cabinet for managing the equipment. Each component of the rubber extruder is critical and indispensable; therefore, when selecting an extruder, careful observation and thorough evaluation of its constituent parts are essential. Only by procuring cost‑effective, high‑performance equipment can we ensure optimal support for our production processes.

1. Operating 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 distinct zones—feeding, compression, and metering—each serving a specific function.

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 dimensions. Furthermore, cold‑feed extrusion is less sensitive to pressure fluctuations and offers greater operational flexibility, while requiring lower capital and operating costs.

3. Equipment Features

Suitable for extruding rubber compounds (EPDM, natural rubber, nitrile rubber, butyl rubber, and reclaimed rubber), it is used to produce composite sealing strips for architectural doors and windows, single‑extruded sealing strips, as well as a wide range of dense and foamed rubber products in various shapes—such as tapes, strips, tubes, and sheets—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 for production, with forced cold feeding as the standard feeding method. 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 that can be produced via extrusion. An extruder is a rubber‑processing machine employed to extrude tread compounds, inner tubes, rubber hoses, and various rubber profiles.

Hebei Shuangda Rubber and Plastics Machinery Co., Ltd. is a modern enterprise integrating research and development, 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 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.