The enthalpy values are guide figures for the heat released between the melt temperature and the ejection temperature; in semi-crystalline materials the heat of crystallization is included. When choosing a temperature control unit, the heating power and the flow rate are assessed alongside the cooling load.
These calculations produce guide values; the final selection has to be based on the part geometry, the mold design and the data from the material manufacturer. For an assessment specific to your application, contact our technical support team.
All of the heat that enters the mold with the melt passes into the cooling water as the part comes down to its ejection temperature. The load is the amount of material processed multiplied by the enthalpy drop of the material; in semi-crystalline materials the heat of crystallization is included in that figure (PP 610, PA66 750 kJ/kg, for example).
The flow rate has to be high enough to keep the inlet-to-outlet difference at 2 – 5 °C; if the difference grows, the two ends of the mold run at different temperatures and warpage becomes a risk. When selecting a temperature control unit, the heating power is assessed alongside the cooling load.
The method, the formula and the limits of each tool are explained directly underneath it, and the explanation changes with the tab you select. The results are engineering guide values; for an assessment specific to your application when choosing the final machine and equipment, contact our technical team.