Cooling rate process and its effect on the final Plastic Injection Parts
In plastic injection molding, the cooling rate is the last part of the molding cycle.
The cooling rate is the rate of decrease from when the plastic resin enters the mold until it fills the last cavity of the mold.
When the temperature no longer drops, the cooling process is complete, and any extra 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 affecting the cooling rate and the final molded part.
Cavity pressure
Monitor, measure cooling rate and display on pressure curve. This is shown because the plastic resin shrinks as it cools, reducing the cavity pressure.
Mold temperature
In plastic injection molding, the temperature of the mold itself may be a factor in the cooling rate process. In addition to affecting the mold cooling line, mold temperature can also affect part defects such as:
Mold warping
Sink mark
injection
Improper mold temperature can also affect performance, such as:
Molding stress
Anti-fatigue
Abrasion resistance
Creep resistance
Molecular weight
Dimensional stability
The cooling rate may also be affected by the use of metals that emit heat.
The cooling process is complete when the temperature no longer drops and any extra time spent cooling the part is useless.
After the cooling process is complete, the part can be safely removed from the mold.
Tip: During the plastic mold design phase, you must consider the optimal cooling channel for the mold. Using a plastic molding machine with an in-depth understanding of the cooling rate, the process can be optimized to better control the mold temperature and thus the cooling rate. For good stress relief molded parts, it will also provide the best cycle time and best results....