The Time to reach ejection temperature result shows the amount of time required to reach the ejection temperature, which is measured from the start of fill.
If the part has not frozen by the end of the cycle time provided, a projected time to freeze is displayed in the result.
For a Midplane/Dual Domain analysis, the value displayed is the time taken for 100% of the local thickness to reach ejection temperature.
For 3D flow, time values are at the individual nodes. Use a cutting plane to investigate the (normally longer) internal values.
This result takes into account the dynamics of the packing phase, and where new hot material enters the cavity. This new hot material affects the cooling time.
NoteThis result is not available for thermoset materials
Using this result
Ideally, the part should freeze uniformly. Areas of the part that take longer to freeze may indicate thicker areas of the part or areas of shear heat during filling and/or packing.
If a long period of time to reach the ejection temperature is caused by thick areas in the part, consider redesigning the part. Long periods of time that are due to shear may be difficult to solve. Reducing the shear may cause the Time to reach ejection temperature to adversely affect volumetric shrinkage and warpage.
If the resulting values for the part as a whole appear high, action to reduce the cycle time may need to be taken, such as reducing the mold and melt temperatures.
Things to look for
- Is the part sufficiently frozen at the end of the packing and cycle time?
- Is the gate freezing off too early before the cavity can be adequately packed out?
- Are there thinner regions freezing off before more extreme thicker regions thus preventing the thicker regions from being adequately packed out?