Advantages of Pin-Type Extruders

Pin‑type rubber extruders are primarily used to manufacture high‑quality rubber products, such as rubber hoses and rubber cables, which are typically produced using this type of extruder. When selecting a pin‑type rubber extruder, it is essential to match the machine’s model and configuration to the product’s size and physical properties. However, certain rubber products—such as rubber sealing strips—are not well suited for processing in an extruder equipped with a pin‑barrier screw. During operation, the pin‑type rubber extruder first uses a temperature‑control system to heat the barrel and screw. Once the equipment reaches the temperature required for plasticizing the rubber, it can increase the extrusion pressure and shorten the mixing time, thereby reducing energy consumption and boosting extrusion efficiency. The pins on the barrel reduce the residence time of the rubber within the barrel, which in turn lowers the requirements for the screw’s length‑to‑diameter ratio. As a result, this type of extruder saves significant energy and enhances production throughput. Consequently, the design of the pin‑type rubber extruder represents one of the more advanced approaches in the field of rubber extrusion 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 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 pin‑based design, 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-Rod Rubber Extruders

1. The barrel is equipped with several sets of pins, which effectively and evenly mix 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-regulation 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 parts 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 the dimensional stability of extruded 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 of hot and cold layers while ensuring uniform heat distribution. Large-capacity mixers, stirring impellers, and conical mixers are 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 non‑leaking feed rollers, coupled with Chongqing hard‑toothed surface reducers and gear‑driven feeding mechanisms that precisely control the amount of material fed, thereby minimizing wear on multi‑barrel screw assemblies, preventing leaks, and extending the equipment’s service life.

Hebei Shuangda Rubber & Plastics Machinery Co., Ltd. is a modern enterprise integrating R&D, 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.