At present, pin‑type cold‑feed extruders are already being used to produce wire, cable, rubber hoses, and other products, as well as in the tire industry, and their range of applications continues to expand. As auxiliary equipment, under conditions of equal extrusion output, using a pin‑type cold‑feed extruder requires less labor, occupies less floor space, and offers a lower overall cost.

Pin-type cold-feed extruders have the following advantages and disadvantages:

1. Pin‑type cold‑feed extrusion exhibits low pressure sensitivity; even when die pressure rises or die‑flange resistance increases, the extrusion rate decreases only slightly.

2. Since the hot‑mixing process is eliminated, the number of quality‑affecting factors is reduced, resulting in a highly uniform extrudate.

3. The rubber compound has a short thermal history, and the extruded material remains at a relatively high temperature, making premature scorching less likely.

4. Wide range of applications and high flexibility, suitable for natural rubber, nitrile rubber, butyl rubber, and more.

5. The pin‑type cold‑feed extruder has lower investment and production costs; although its purchase price is about 50% higher than that of a hot‑feed extruder, it eliminates the need for a open‑mill feeder and other auxiliary 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 extruder, pins are radially inserted into the screw’s flight grooves from the barrel’s circumferential direction, shearing and mixing the flowing rubber compound. The material melts and flows within the screw flights 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 die 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 parameters. 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 amount of material fed, minimizing excess and preventing damage to the multi‑barrel screw that could lead to leakage, thereby extending the equipment’s service life.

Hebei Shuangda Rubber and 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.