High plant temperatures and temperature variation in general make accurate mold temperature control very difficult. Injection molds are designed with water lines to thermodynamically balance the loss of heat from the plastic material to achieve a specific plastic shrink and, thereby, part dimension. Molds are run with individual water temperature controllers to achieve the desired temperatures. Consistent control of mold temperature and the resulting plastic shrink is absolutely critical to high precision injection molding. Environmental temperature variation undermines the goal of consistency.
Finally, elevated humidity, where the plants dew point exceeds the temperature of a mold (58 degrees F), creates condensation and a rapid chilling affect on molding surfaces as the mold opens and closes. The result is an extremely negative effect on precision molding.
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