Average temperature, cold runner result

The Average temperature, cold runner result is the average temperature of the temperature profile across the cold runner, calculated at the end of cooling time.

This profile is based on the average mold surface temperatures for the cycle, which includes the clamp open time.

Using this result

In some cases where there are thick runners, the average temperature will be very high, possibly above the ejection temperature. This indicates the runners may control the cycle time. The cycle time of a mold should be based on the part and not the runner.

To reduce the average temperature and cooling time of the runners, consider reducing the runner diameter. Adding cooling channels around the runners or reducing the coolant temperature for the circuits cooling the runners will also reduce the average temperature.

Note: Most parts can be ejected with the runners 50% frozen and thick parts 80% frozen.

Things to look for

• Check that the average temperature is below the ejection temperature.