There are many types of rubber hoses. Classified by structure, they fall into two main categories: single‑layer rubber hoses and composite rubber hoses. Single‑layer EPDM straight‑type hoses are manufactured using a process similar to that of EPDM sealing strips: the material is extruded on a rubber extruder, then passed through a hot‑air vulcanization oven, and finally cut to the desired length by an automatic cutting machine before being wound onto reels for packaging. Single‑layer hoses also come in profiled forms; these require additional shaping after extrusion. After extrusion, the hose is fed through a shaping die to set its cross‑section, then placed in a vulcanization oven for curing. Once cured, the shaping mandrel is removed, completing the production process. This single‑layer manufacturing method is relatively simple and easy to master. However, some composite hoses involve more complex processes. For example, automotive hoses are produced using two rubber extruders operating in tandem. These hoses incorporate a braided reinforcement layer: after the inner layer is extruded on one machine, the product is conveyed to a braiding or winding machine to apply the reinforcement, followed by a second extruder that forms the outer layer, thereby bonding the layers together. The assembled hose then passes through a cooling tank and a dipping bath, after which it is cut to length. The resulting hose blanks are then fitted onto shaping mandrels, shaped in a molding die, and finally placed in a vulcanization oven for curing. Such composite hoses must undergo pressure‑vulcanization; otherwise, their performance will not meet our specifications. In summary, different hose production lines employ varying equipment, processes, and techniques. When manufacturing, it is essential to select the most appropriate approach based on the specific requirements of the product.

Rubber hoses can be used in the rubber industry for extrusion molding of various rubber products, including rubber hoses, heater hoses, wire‑clamping hoses, inner tubes, adhesive tapes, bead‑wrapping tapes, and more. They are also suitable for supplying heated rubber stock to 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 requirements of the product’s manufacturing process. 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 being decelerated by 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 hard‑toothed‑surface type. The driving gear for the side‑pressing roller is radially supported by a bearing, and the roller itself is secured via a bearing bracket 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 and 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.