how to troubshoot bright shadow on a seatbelt buckle?
Do you know “shiny mark”? one my customer injecting mold a seatbelt buckle , material is PA6, in-set metal bone frame, Almost every injection resulted in this shiny mark appearing on the surface of the product，y customer has modified the mold many times, changing it from a glossy surface to a matte surface, and has repeatedly adjusted the process, moved the gate position many times, and designed a cold slug well, but ultimately cannot eliminate the bright shadow. My guess is that at the weld line, the hot melt meets the cold melt and gets stuck there before cooling down, thus forming a bright shadow on the surface. However, the customer insists that we solve it by modifying the material, which I don't think is the right approach. Can anyone offer some insights?