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EspañolCooling Rate Process and Its Effect on Final Formed Parts
In plastic injection molding, the cooling rate is the last segment of the molding cycle.
The cooling rate is the rate of deceleration from the time the plastic resin enters the mold until the last cavity of the mold is filled.
When the temperature can no longer drop, the cooling process is complete and any additional time spent cooling the part is useless.
After the cooling process is complete, the part can be safely removed from the mold.
The following are important factors that affect cooling rates and final molded parts...
cavity pressure
The cooling rate is monitored, measured, and displayed on the pressure curve. It is shown this way because the plastic resin contracts as it cools, reducing cavity pressure.
mold temperature
In plastic injection molding, the temperature of the mold itself can be a factor in the cooling rate process. In addition to affecting mold cooling lines, mold temperature can also affect part defects such as:
mold warping
sink marks
injection
Improper mold temperature can also affect performance, for example:
mold stress
fatigue resistance
wear resistance
Creep resistance
molecular weight
Dimensional stability
Using thermally conductive metals also affects the cooling rate.
The cooling process is complete when the temperature can no longer decrease and any additional time spent cooling the part is useless.
After the cooling process is complete, the part can be safely removed from the mold.
