2.1.2. Cooling Time

When the molten plastic hits the walls of the mould cavities, it starts to cool down and continues to solidify. The mould stays closed until the moulded part reaches the ejection temperature. The part is ejected out from the injection mould once it becomes rigid enough [85,86]. When the cooling time, including that needed for the moulded component to achieve the injection temperature, is increased, shrinkage and warp issues are reduced [87,88]. However, the appropriate cooling time needs to be determined in order to produce moulded parts with good quality within the optimal cycle time.
