Pin‑type rubber extruders are commonly used for producing rubber hoses, which is why they are often referred to as rubber hose extruders. However, pin‑type extruders are not limited to hose production; they are also employed in applications such as rubber cables and the extrusion of tire treads. The key difference between a pin‑type rubber extruder and a conventional cold‑feed extruder lies in the design of the barrel: several rows of pins are evenly distributed along the barrel to increase the extrusion pressure exerted on the rubber by the screw, thereby enhancing the density and sealing performance of the final product. These pins are inserted radially and perpendicularly into the barrel, and as the rubber compound is heated within the barrel, its flowability improves, transitioning into a sol state. Shear generated by the screw threads further promotes mixing and gradually transforms the material into a viscous, flowable state. The pins help break up laminar flow and agglomeration during extrusion, disrupting rubber lumps and ensuring thorough plasticization, lower processing temperatures, and energy savings, thus simplifying the manufacturing process. The barrel and screw design of a pin‑type extruder can be optimized to enhance the screw’s thread geometry, boosting extrusion efficiency while reducing the power requirements of the equipment. Nevertheless, when selecting an extruder, it is essential to match the machine configuration to the specific product being manufactured: some rubber products are well suited to pin‑type extruders, whereas others are not appropriate for this type of equipment.

Purpose:

The pin‑type cold‑feed rubber extruder is well suited for extrusion molding of hoses, inner tubes, tapes, sealing products, and other rubber goods. In this type of extruder, pins are radially inserted into the screw’s helical grooves from the barrel’s circumferential direction, shearing and mixing the flowing rubber compound. The material melts and flows within the screw threads at a low shear rate, gradually forming a continuous viscous flow. This process eliminates laminar flow and lumping during extrusion, breaks up rubber agglomerates, ensures thorough plasticization, maintains low compound temperatures, and achieves energy savings, thereby simplifying the production process. Thanks to the unique action of the pins, the pin‑type cold‑feed extruder offers high output, low processing temperatures, reduced energy consumption, superior product uniformity, stable discharge, and minimal residual rubber left in the screw after shutdown.

Performance Characteristics of Pin-Type Rubber Extruders

1. The barrel is equipped with several sets of pins, enabling efficient and uniform mixing of the material.

2. The screw and barrel, optimized through CAD design, can meet the diverse requirements of users regarding design, formulation, and processing conditions. Equipped with an AC motor and variable-frequency drive, this equipment offers a wide speed‑control range, excellent adaptability to producing rubber products of different specifications, and convenient operation.

3. This machine is characterized by improvements made to the original extruder, emphasizing cost-effectiveness and ease of maintenance.

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

5. This machine employs a feed roller for forced material feeding, enabling the processing of multi-layer rubber strips with dense extrusion and excellent product quality.

6. All components in contact with the rubber compound are cooled by circulating water and equipped with a thermostatically controlled water‑temperature regulation system; selecting an appropriate water temperature ensures consistent quality for extruding a variety of rubber compounds.

7. The pins mounted in the barrel divide the laminar flow of the rubber compound as it moves along the screw, promoting mixing between hot and cold layers while ensuring uniform heat distribution. Large-capacity mixers, stirring impellers, and conical mixers are used for thorough blending.

8. A flexible and versatile design system that can swiftly meet customers’ specifications. Equipped with various die heads, it can be used for material feeding, sheet extrusion, pipe extrusion, and extrusion of custom‑shaped profiles, among other applications.

The rubber hose extruders manufactured by Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. feature a cold-feed system with a non‑leaking feed roller, coupled with a hard‑toothed surface reducer from Changzhou. A gear‑driven feeding mechanism precisely controls the material feed rate, minimizing excess material and preventing damage to the multi‑barrel screw, thereby extending the equipment’s service life.

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 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.