In modern manufacturing, achieving A-class surface finish on injection molded parts is a core requirement for high-end products such as automotive components, electronic housings, and medical devices. A-class surface finish (Ra ≤ 0.05μm) means a mirror-like smooth, defect-free surface that enhances the product’s aesthetics and durability. As a professional injection molding service provider, ATC-mould has helped numerous clients optimize their production processes.
First, mold design and processing are crucial. Select high-quality steel materials (Daido NAK80 (HRC38-42), ASSAB NIMAX ESR (HRC38-42), ASSAB STAVAX ESR (HRC48-52)) to ensure the cavity surface roughness is minimized. Achieve mirror finish level 2 or above through diamond polishing or electrolytic polishing. At the same time, avoid mold oil contamination, water stains, or excessive use of release agents, as these will reduce the surface finish of the injection molded parts.
Second, the selection of plastic materials is key. Prioritize high-flow transparent plastics such as PMMA and PC, which easily achieve excellent gloss in the injection molding process. Combine hot & cold molding technology: heat the mold to 80-130℃ before injection to improve resin flowability and eliminate weld lines; after packing, rapidly cool to 60-70℃ to reduce deformation.
Optimize the injection molding process parameters. Adjust injection speed, melt temperature, and pressure to ensure uniform filling. Excessive speed or prolonged residence time will cause gloss reduction; appropriately increasing mold temperature and reducing cooling speed can significantly improve surface brightness.