Automotive hose production line

Among the EPDM rubber hoses we produce, automotive hoses are classified as composite profiled hoses. During manufacturing, they are typically produced via in-line extrusion using two rubber extruders. We select the appropriate extruder model based on the product’s size and structure. The first extruder forms the inner layer of the hose: rubber is fed through the hopper into the barrel, where it undergoes shearing, mixing, and other processing steps before being extruded at the die to take the shape of an inner tube, which is then conveyed forward by a traction system. After the inner layer is extruded, it is passed through a knitting machine to form a braided reinforcement. The knitted inner tube is then drawn by a traction unit to the rear end of the T‑die on the second extruder, where it is interlaced with the outer layer extruded by that machine, resulting in a composite hose. The product exiting the T‑die of the second extruder represents the basic assembled hose structure. Next, the hose passes through a cooling water tank and a release‑agent bath, followed by a fixed‑length cutting machine that trims the hose to the desired dimensions. Once extruded, the hose is slipped over a shaping mandrel and placed in an aging autoclave for vulcanization, thereby completing the final curing process. Most automotive hoses are made primarily from EPDM rubber, though some are formulated with silicone rubber. Regardless of the rubber type, the manufacturing processes and underlying principles remain essentially the same.

Purpose

It is suitable for the efficient extrusion of various silicone‑based profiles, including silicone tubes. The design of the silicone extruder and its feeding system have been successfully implemented, enhancing production stability and reducing the workload on operators. A screw with a high compression ratio and a high length‑to‑diameter ratio ensures excellent extrudate density and mixing performance, resulting in products with smooth inner and outer surfaces, no bubbles, and consistent dimensional stability.

Performance Characteristics of Silicone Tube Extruders

1. This machine is equipped with an AC motor and features variable-frequency speed control, offering a wide speed range, excellent adaptability to the production of silicone rubber products in various specifications, and convenient operation.

2. This machine is equipped with a hardened‑tooth‑surface rubber extruder reducer, which features low noise, high transmission torque, smooth operation, and convenient maintenance.

3. This machine employs pneumatic cylinder‑driven forced feeding, enabling the processing of multi‑layer rubber strips with dense extrusion and excellent product quality.

4. This machine is equipped with a dual-channel automatic temperature controller, ensuring minimal temperature fluctuations during heating. It allows for optimal selection of the heating temperature based on different processing requirements and automatically maintains the set temperatures of the heated barrel and die head.

5. This machine employs electric heating for the barrel and a circulating cooling system, enabling rapid cooling of the material to prevent thermal degradation.

Hebei Shuangda Rubber & 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 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.