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Technical Insights | Causes and Systematic Improvement Solutions for the Ring-Shaped Halo (Gate Smear / Haze Ring) Around the Injection Gate
During precision injection molding mass production, many appearance parts show a typical defect: a ring-shaped dull halo forms around the gate, commonly called gate smear or gate halo in the industry. This color-difference defect directly affects the appearance grade of products and, in severe cases, directly causes batch defects, raw material loss and delivery delays. It is widely seen in the production of home appliance housings, 3C accessories, daily necessities and automotive appearance plastic parts. I. Defect phenomenon: a highly recognizable ring-shaped dull halo forms around the gate opening, with dark and uneven color...