Manufacturing of pin-type rubber hose production lines

The introduction of the pin‑bar barrel cold‑feed extruder has advanced and expanded the technology of cold‑feed extrusion. This type of extruder features significant improvements in its screw design, and the addition of pins to the barrel markedly enhances plasticization efficiency, increases the density of extrudates, and boosts output. Moreover, it operates at lower discharge temperatures, meeting the demands of a wide range of production processes. The optimized screw geometry also reduces drive power, leading to a substantial decrease in specific energy consumption. Owing to its superior plasticization, low discharge temperature, and high throughput, it has found increasingly broad application in rubber manufacturing. Its versatility spans numerous sectors of the rubber industry, including extrusion of tire semi‑finished products, inner and outer tube extrusion, material supply for calendering lines, extrusion of various‑shaped rubber parts, and filtration extrusion of reclaimed rubber. Key characteristics of the pin‑bar barrel cold‑feed extruder are evident in its plasticization zone, which is divided into a pin‑bar barrel section and a conveying section. In the pin‑bar barrel section, the compound undergoes thorough plasticization; it then moves to the conveying section for complete blending. This dual‑stage process enhances mixing and plasticization performance, boosts production capacity, and helps reduce temperature rise and energy consumption.

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 that typically occur during extrusion, breaks down 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, ensuring 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 thorough mixing between hot and cold layers while ensuring uniform heat distribution. Large-capacity mixers, stirring impellers, and conical mixers are commonly used for this purpose.

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, profile extrusion, and more.

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 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.