Two‑component rubber sealing strip production line

1. Working Principle Extrusion molding is a manufacturing process in which plasticizable rubber compounds are continuously forced through a die under specific conditions, forming products with defined cross-sectional shapes. As the rubber compound moves forward along the screw, mechanical and thermal effects cause changes in its viscosity and plasticity, transforming it into a viscous fluid. Based on these changes during extrusion, the working section of the screw is generally divided into three main zones according to their functions: the feeding zone, the compression zone, and the metering (or extrusion) zone. 2. Cold-Feed Extrusion Advantages: This method eliminates the need for heat‑treating equipment, facilitates mechanization and automation, and—thanks to the enhanced shear and plasticizing action of the screw—produces rubber compounds with uniform temperature and consistent plasticity. It improves the quality of extruded products, enhances surface smoothness, and ensures semi‑finished extrudates maintain stable, consistent dimensions. Additionally, cold-feed extrusion exhibits low sensitivity to pressure fluctuations, offers broad applicability and flexibility, and requires lower capital investment and operating costs compared to other extrusion methods. 3. Equipment Features This equipment is suitable for extruding various types of rubber, including EPDM, natural rubber, nitrile rubber, butyl rubber, and reclaimed rubber. It is used to produce composite sealing strips for building doors and windows, single‑extruded sealing strips for automobiles, as well as dense and foamed rubber products in diverse forms such as tapes, strips, tubes, and sheets—for applications in construction, electrical appliances, machinery, water conservancy, and more. The cold-feed rubber sealing strip extruder is specifically designed to process cold rubber compounds, typically employing forced cold feeding. Its key features include high production efficiency and stable output. Such extruders are commonly utilized to manufacture sealing strips, rubber hoses, and other products that can be produced via extrusion processes. They are also widely employed in producing tire treads, inner tubes, rubber hoses, and various rubber profiles. Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. is a modern enterprise specializing in the research, development, manufacturing, and sales of complete sets of extrusion machinery for rubber, silicone, and plastics. Located in Liyuantun Town, Weixian County, Xingtai City, Hebei Province, the company enjoys an advantageous geographical location with convenient transportation access. Currently, the company employs 120 staff members, including 30 technical personnel and 8 senior engineers. Our professional technical team ensures consistently reliable product performance. The company’s primary product lines encompass rubber extruders, rubber hose extruders, triple‑compound vulcanization production lines, elastomer extruders, and other extrusion equipment, along with manufacturing systems for engineering seals, automotive seals, cable and wire components, air‑conditioner rubber tubing, automotive oil hoses, waterstop strips, and related products. Adhering to the principle of “customer‑centricity and integrity,” we regard equipment quality as paramount. We provide customers with high‑quality machinery and services, backed by comprehensive technical support. We warmly welcome domestic and international clients to visit our facility for guidance and collaboration. We look forward to establishing long-term partnerships and achieving mutual success.

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Two‑component rubber sealing strip production line

1. Operating Principle

Extrusion molding is a manufacturing process in which a plasticizable compound is continuously forced through a die under specific conditions, thereby forming 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 different function.

2. Cold-feed extrusion

Advantages: It saves on hot‑melt processing equipment, facilitates mechanization and automation, and, thanks to the extruder’s enhanced screw shear and plasticizing action, ensures uniform temperature and plasticity of the compound. It improves the quality of extruded products, enhances surface finish, and produces semi‑finished extrudates with consistently stable dimensions. Cold‑feed extrusion is less sensitive to pressure fluctuations. It offers broad applicability and high flexibility, while requiring lower capital and operating costs compared to other extrusion systems.

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 dense and foamed rubber products—such as strip‑shaped, bar‑shaped, tubular, and sheet‑like components—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, and its feeding system typically employs 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 that can be produced via extrusion. An extruder is a rubber‑processing machine designed for extruding tread compounds, inner tubes, rubber hoses, and rubber profiles.

Hebei Shuangda Rubber and Plastics Machinery Co., Ltd. is a modern enterprise that integrates the research and development, manufacturing, and sales of complete sets of extrusion machinery for rubber, silicone, and plastics.
The company is located in Liyuantun Town, Weixian County, Xingtai City, Hebei Province, enjoying a superior location and convenient transportation.
The company currently employs 120 staff members, including 30 technical personnel and 8 senior engineers. Our dedicated technical team ensures the consistent and reliable performance of our products.
The company’s main products include rubber extruders, rubber hose extruders, three‑layer vulcanization production lines, elastomer extruders, and other extrusion equipment, as well as manufacturing machinery for engineering seals, automotive seals, cables and wires, braided hoses for air conditioners, automotive fuel lines, waterstop strips, and related products.
Our company adheres to the principle of “customer-centricity and integrity,” regarding equipment quality as our lifeline. We provide customers with high‑quality equipment and services, backed by comprehensive technical support. We warmly invite domestic and international clients to visit our facility for guidance and collaboration. We look forward to establishing a long‑term partnership with you, creating mutual success.