Ejector mark is a concave or a convex on the surface of plastics product. It causes rapid variation in thickness which leads to gloss differences and concaves.
2. Cause of ejector marks.
+ Injection molding process-related cause (ex: early opening mold or high release force due to incorrect machine setting.)
+ Shape-related cause (ex: Defective assembly and inaccurate length of ejector)
+ Machine and strength-related cause (ex: Defective measuring & design of mold, product or ejector system)
+ Thermal cause (ex: Huge temperature difference between ejector and mold or inside of a mold)
3. Improve ejector mark.
+ Mold lapping.
+ Increase wall thickness.
+ Make draft angle for ribs, boss,… of plastic product.
+ Re-setting ejector system.
+ Increase cooling time,..