engleski

Influence of cavity materials on the cooling time of molding

The laws for optimal heat exchange in molds for injection molding of thermoplastic melts have been known for a relatively long time, more than 30 years. But from time to time we can read and hear that someone has achieved shortening of the cycle time and hence the cooling time of molding also by two-digit percentages. Based on the general equation of the cooling time of molding, for the necessary quality of molding, thus for the given process parameters (melt and cavity temperature), properties of thermoplastic melt (deflection temperature under load, thermal diffusivity) and geometry of molding the cooling time is constant. The only way to reduce the cooling time and thus the cycle time as well is the choice of proper materials for mold parts forming the cavity. Materials with low thermal properties offer great opportunity for shortening the cooling time, but their advantage is restricted to relatively small parts.

cavity material; general cooling time equation; low and high thermal properties of cooling time

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