B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1196
B29C 35/04 (2006.01) B29C 35/00 (2006.01) B29C 45/73 (2006.01)
Patent
CA 1251612
PASSIVE MOLD COOLING AND HEATING METHOD AND SYSTEM Abstract of the Disclosure A mold for molding articles of plastic or other like materials, having a plurality of vertically extending internal passages, is connected by inlet and return conduits into a closed loop that includes a heat exchanger partially filled with a liquid supply of a cooling fluid or a heating fluid. For cooling the heat exchanger is positioned with its liquid level above the top of the mold, the inlet conduit connects the lower part of the heat exchanger, below the liquid level, to the lower ends of the mold passages, and the return conduit connects the upper ends of the mold passages to the upper part of the heat exchanger; for heating these relationships are reversed. In operation the fluid changes its physical state at critical points in the mold passages, going from liquid to vapor for cooling and from vapor to liquid for heating; circulation in the closed loop is in response to the effect of gravity. Operation of the heat exchanger is controlled to maintain a controlled pressure in the closed loop.
494896
Aec Inc.
Macrae & Co.
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