Cooling time

The temperature of the injection molding machine is controlled during the complete cycle.
As the cooling system is always active, the length of the cooling time is not clearly defined.
During the filling, the melt moists the cavity only partly.
This is the reason for the definition of the cooling time from the end of injection until ejection.
That means, the cooling time equals the packing time (green line) plus the residual cooling time (blue line in the time-pressure-diagram).

Cooling time in Plastic Industry
Cooling time in Plastic Industry

Injection Molding Process (Picture 1): The packing and residual cooling time add up in general to the cooling time.
Injection Molding Process (Picture 2): Temperature distribution across thickness at the end of cooling time.

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This glossary of plastic industry is provided by PLEXPERT Canada Inc.