How to solve the silver pattern generated when plastic injection molding?

December 02 13:10:32, 2023

Silver streaks are also known as (mica marks), bubbles. Some parts of the surface of the injection molded parts have inconsistent finish and a silver surface.

Possible causes:
Recommended remedy:
Injection molding machine
A. The surface temperature of the melt is too high
Reduce the temperature of the shooting cylinder
B. The plastic stays in the shooting tank for too long
Reduce total cycle time
Injection volume is too small for injection molding requirements
C. The temperature of the melt is too low to make the mold filling time unstable.
Increase the temperature of the shooting cylinder
Increase the nozzle temperature
Increase mold filling speed
D. Insufficient injection pressure
Increase injection pressure
E. The temperature controller is not accurate, which makes the control different.
Check that the temperature controller is accurate and controllable
Mold
A. The mold surface temperature is too low
Increase mold temperature
Limit the speed at which coolant flows through the mold
B. There are some unplasticized plastic cold materials on the injection molded parts.
Increase the size of the cold pocket
Extend the end of the runner to form an additional plastic cold pocket using an electrically heated nozzle and nozzle sleeve
C. The runners and gates are too small or too long, causing the plastic to condense during transport
Increase runner diameter and gate depth if needed
D. Excessive mold release agent on the mold surface
Thoroughly clean the mold surface with white alcohol
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Possible causes:	Recommended remedy:
Injection molding machine
A. The surface temperature of the melt is too high	Reduce the temperature of the shooting cylinder
B. The plastic stays in the shooting tank for too long	Reduce total cycle time Injection volume is too small for injection molding requirements
C. The temperature of the melt is too low to make the mold filling time unstable.	Increase the temperature of the shooting cylinder Increase the nozzle temperature Increase mold filling speed
D. Insufficient injection pressure	Increase injection pressure
E. The temperature controller is not accurate, which makes the control different.	Check that the temperature controller is accurate and controllable
Mold
A. The mold surface temperature is too low	Increase mold temperature Limit the speed at which coolant flows through the mold
B. There are some unplasticized plastic cold materials on the injection molded parts.	Increase the size of the cold pocket Extend the end of the runner to form an additional plastic cold pocket using an electrically heated nozzle and nozzle sleeve
C. The runners and gates are too small or too long, causing the plastic to condense during transport	Increase runner diameter and gate depth if needed
D. Excessive mold release agent on the mold surface	Thoroughly clean the mold surface with white alcohol