SAIC Export Model Tail Lamp Photometric Lens

Challenge:
The main challenge was to ensure stable two-shot molding while achieving a high-gloss mirror-like surface finish on PMMA optical components. The process required precise control of material compatibility between two injection stages to avoid defects such as delamination, flow marks, weld lines, and uneven gloss. In addition, the optical surface demanded strict control of transparency, surface uniformity, and dimensional accuracy to ensure consistent light transmission performance.

Solution:
We optimized the two-shot molding sequence by carefully controlling injection timing, bonding interface design, and material flow balance. High-precision machining and polishing were applied to ensure a defect-free mirror-like surface on the optical area. The mold cooling system and gate layout were optimized to stabilize temperature distribution and reduce internal stress. During mold trials, injection parameters such as melt temperature, mold temperature, injection speed, holding pressure, and cooling time were finely adjusted to achieve stable bonding, high optical clarity, and consistent surface quality.