Hello and welcome to another Rule of Thumb post. Today we discuss how to fast estimate the cooling time in injection moulding.
Main influencing factor of the cooling time is the wall thickness, since it the wall thickness is included squarely in the cooling time calculation. Another factor is the tool temperature. For example, a 10°C increase of tool temperature will lead to a 30% elongation in cooling time. Increasing the melt temperature will lead only to a 3% increase in cooling time.
Equation 1 shows the simplified cooling time calculation which can be used for a fast assessment (it is still recommend to calculate the cooling time with a more detailed equation whenever possible). We need to have the maximum wall thickness of your part and a multiplication factor between 1.5 and 2 (sometimes also higher e.g. 2.5 for PARA).
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| Equation 1: Estimating the cooling time in injection moulding [1]. |
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