There are many types of rubber hoses, and the choice of production equipment and manufacturing process depends on the specific hose type. For example, a single‑layer ERDM rubber hose can be produced using just one rubber extruder to perform extrusion molding; in such cases, we typically employ a pin‑type rubber extruder for this purpose. After the rubber has been processed in a mixer or open mill, it is fed into the extruder’s feeding system for filling and extrusion. Once loaded into the extruder barrel, the rubber is heated, its flow properties improve, and it undergoes continuous processing as the screw rotates. Finally, at the extruder die, it is shaped into the desired rubber hose. After extrusion, the hose must pass through a 30‑meter hot‑air curing section to complete the curing process. However, some composite rubber hoses require selecting equipment and processes based on their structure and composition. For instance, a specialized three‑layer composite cooling hose used in automobiles necessitates an online extrusion process involving two rubber extruders: one extrudes the inner layer, which is then knitted by a knitting machine, after which the inner layer is combined with the outer layer—extruded by a second extruder through a T‑die—to form the final hose structure. Following extrusion, the product is rinsed with water and treated with a release agent, then cut to the required length by a cutting machine. These pieces are subsequently shaped in a forming mold and cured in a curing tank to finalize production. In short, different types of rubber hoses call for distinct manufacturing processes and equipment.

It can be used in the rubber industry for extrusion molding of rubber hoses, heater hoses, wire‑reinforced hoses, inner tubes, adhesive tapes, bead strips, and other rubber products. It is also suitable as a hot‑mixing feed unit for small calendering machines. Compared with conventional rubber extruders, cold‑feed rubber extruders offer higher production capacity, lower compound temperatures, reduced electrical energy consumption, superior mixing performance, uniform plasticization, and increased output.

The rubber hose extruder boasts excellent self-cleaning performance. Its screw is made of 38CrMoAlA alloy. The extrusion speed can be adjusted to meet the specific process requirements of the product. The extruder die is easily removable and capable of producing multi‑cavity profiles in various sizes.

The cold-feed rubber extruder is driven by an electric motor that, after reduction via a gearbox, rotates the screw. The screw is housed within a barrel fitted with pins. At the initial section of the screw, a side‑pressing roller is mounted; it rotates in the opposite direction to the screw, forcibly feeding the rubber compound and extruding it from the screw’s discharge end. Notably, belt drive is employed between the motor and the gearbox with appropriate speed reduction, while the gearbox is a standard horizontal type with hardened gear surfaces. The driving gear for the side‑pressing roller is located by a radial bearing, and the roller itself is secured to a hinged door that can be flipped downward for access. Spiral return‑rubber grooves are machined into the side of the bearing bracket, and the pin‑equipped barrel features a symmetrical design.

Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. is a modern enterprise that integrates 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.