What are the differences between pin type cold feed extruders and regular cold feed extruders? What is it advantages?

The pin-type cold feed extruder is a core processing equipment in the rubber industry. It achieves shearing and mixing of rubber compounds through a combination of radial and tangential pins. The equipment features a segmented barrel and screw design with adjustable pins and a cooling system, exhibiting low-temperature, high-efficiency extrusion characteristics. It is suitable for molding tire treads, hoses, sealing strips, and other products. Technological innovations include a bi-alloy screw material and an adjustable pin length mechanism, enabling a maximum production capacity of 3500 kg/h. A patented technology developed in 2024 will improve shearing efficiency by 30%.

The core difference between pin-fed cold-feed extruders and ordinary cold-feed extruders lies in their barrel structure: Pin-fed extruders have multiple rows of radial and tangential pins evenly distributed along the inner wall of the barrel. These pins penetrate into corresponding slots in the screw, generating strong shearing, stirring, and mixing effects during rubber compound transport. Ordinary cold-feed extruders, on the other hand, have a smooth inner barrel wall and rely primarily on screw rotation to transport and plasticize the rubber compound.

This structural difference brings significant performance advantages, making pin-fed cold-feed extruders the mainstream equipment in the modern rubber industry.

1. Better plasticizing effect and more uniform rubber compound: Pins effectively disrupt the laminar flow structure of the rubber compound in the screw, eliminating agglomeration and achieving three-dimensional composite motion. This results in more uniform mixing and higher plasticizing quality, significantly improving the density and dimensional stability of the final products (such as tire treads and hoses).
2. Lower discharge temperature and energy efficiency: The shearing action of the pins completes plasticizing more efficiently, reducing reliance on frictional heat. With an advanced cooling system, the rubber compound temperature can be controlled below 120℃, 15-20℃ lower than ordinary models. This not only avoids rubber compound scorching but also reduces unit energy consumption, reportedly by 25%.
3. Higher Output and Improved Production Efficiency: Due to its high plasticizing efficiency, the pin-type extruder has a stronger production capacity, with some advanced models reaching 3500 kg/h. Simultaneously, its high efficiency also means that a smaller length-to-diameter ratio (e.g., 12:1 to 18:1) can be used to achieve the same plasticizing effect, resulting in a more compact equipment structure.
4. Strong Adaptability and Wide Application: It is more adaptable to rubber compounds with different properties, and is widely used in the extrusion molding of tire treads, inner tubes, hoses, sealing strips, conveyor belt core rubber, cable coatings, and other products. It can even replace open mills as a rubber supply for calenders.
5. Superior Operation and Maintenance: Modern design emphasizes self-cleaning, making rubber compound changes easier. The use of wear-resistant materials such as bi-alloy screws extends service life. Advanced temperature and electrical control systems also make operation more convenient and the process more stable.