In injection production, the cooling time of plastic injection parts accounts for about 80% of the whole injection production cycle.Poor cooling often leads to warping deformation or surface defect, which affects dimensional stability of the product.Reasonable injection, pressure protection and cooling time can improve product quality and productivity.
The cooling time of the parts usually refers to the time between the plastic melt filling the injection mold cavity and the time when the parts can be opened and removed.The time standard for taking out the parts can be set by opening the mould. Usually, the parts have been fully solidified, with certain strength and rigidity.
Even when molded using the same plastic, the cooling time varies with the thickness of the wall, the temperature of the molten plastic, the demoulding temperature of the parts and the temperature of the injection mold.The formula for calculating the cooling time 100 per cent correctly in all cases has not yet been published, but only on the basis of appropriate assumptions.The calculation formula also varies according to the definition of cooling time.