Publish Time: 2026-01-12 Origin: Site
As the "bearing core" of the powder coating extruder, the barrel forms a closed space for material plasticization and kneading together with the screw. Its material performance, structural design and temperature control accuracy directly affect the material melting quality and equipment operation stability. YTOPSUN has been deeply engaged in the R&D of extruder barrels for many years. Aiming at the high-abrasive and heat-sensitive production characteristics of powder coatings, it has created a series of bimetallic composite barrels, integrating three advantages: material upgrading, structural optimization and precise temperature control, providing stable and reliable bearing solutions for various powder coating production.
I. Core Structure and Functional Positioning of the Barrel
The barrel of the powder coating extruder adopts an integral or segmented structural design. YTOPSUN provides customized solutions according to the needs of different production scenarios: segmented barrels are selected for small-batch customized production, which are easy to disassemble, clean and replace parts, adapting to rapid switching of multiple formulas; integral barrels are adopted for large-scale mass production, ensuring the concentricity of the inner wall of the barrel through precision machining, reducing material leakage and local wear. Heating and cooling channels are opened on the inner wall of the barrel, forming a uniform temperature field with the temperature control system, providing a stable thermal environment for the conversion of materials from solid to molten state, and avoiding material scorching or insufficient plasticization through precise temperature control.
II. Material Upgrading and Wear-Resistant Anti-Corrosion Technology
In powder coating production, high-fill materials and abrasive raw materials are likely to cause continuous loss to the inner wall of the barrel. YTOPSUN improves the durability of the barrel from the source, adopting centrifugal casting bimetallic composite technology, with 38CrMoAlA high-quality alloy steel as the matrix and 0.5-1.0mm tungsten carbide alloy layer compounded on the inner wall. After plasma nitriding treatment, the surface hardness can reach HV≥1000, and the wear resistance is 4-6 times higher than that of ordinary nitrided barrels. At the same time, the inner wall adopts precision honing technology, with roughness controlled at Ra≤0.3μm, reducing the risk of material adhesion and carbonization, and adapting to the long-term stable production of high-abrasive, high-fill and heat-sensitive powder coatings.
III. Structural Optimization and Adaptability Design
YTOPSUN barrels adopt gradient wall thickness design, with the wall thickness of the feed end increased to 15-20mm to improve impact resistance and feeding stability; the wall thickness of the melting section and kneading section is gradually optimized to ensure the balance between uniform heat conduction and structural rigidity. The clearance between the barrel and the screw is accurately calculated and controlled within 0.1-0.3mm, which not only ensures sufficient shear plasticization of materials, but also avoids wear caused by direct friction between the screw and the barrel. In addition, the feed port of the barrel adopts a flared design with an arc transition structure, reducing the feeding resistance of powder raw materials, avoiding bridging and improving feeding stability.
IV. Maintenance and Service Life Extension Strategies
Based on years of application experience, YTOPSUN provides a full-cycle maintenance plan for the barrel: before starting, preheat with the screw, control the heating rate within 5℃/min to avoid barrel deformation caused by excessive temperature difference; when changing materials, use special cleaning materials to clean the inner wall at low speed to remove residual materials and prevent carbonization and adhesion; when shutting down for a long time, apply anti-rust oil to the inner wall of the barrel and seal both ends to avoid moisture and rust. It is recommended to regularly check the wear of the inner wall of the barrel. When the wear amount exceeds 0.2mm, repair it by inner hole honing or replace the inner liner to extend the service life of the barrel.
V. Industrial Value of YTOPSUN Barrel Technology
Through modular design and customized parameter configuration, YTOPSUN bimetallic barrels adapt to the production needs of various powder coatings such as general-purpose, heavy anti-corrosion and heat-sensitive. Their excellent wear resistance and precise temperature control effect effectively reduce equipment maintenance costs and production losses, and improve the uniformity and stability of finished coatings. With strict quality control and technological innovation, YTOPSUN barrels have become a benchmark component in the powder coating extrusion equipment field, helping enterprises achieve efficient, stable and low-cost production.