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Freeze Drying.--You can dry frozen materials such as blood plasma from 70 to 90 per cent faster by feeding them penetrating "hot-shots" of electricity than you can by merely conducting heat to them, a University of Wisconsin student and his professor have shown in research studies they conducted in chemical engineering.
They found that freeze drying with radiant energy is more rapid than with conduction heating because of the penetration of radiation into the product. They found out, for example, that the freeze-drying capacity of an organic dye was increased by 74 per cent by virtue of the penetrating effect of radiant energy. The advantages of the reduction in drying time would be reflected in lower equipment costs and reduced operating costs for the freeze-drying process, they explained.
The Wisconsin experimenters who made the findings are W. H. Zamzow, and W. R. Marshall, Jr. The work was done under the Wisconsin Engineering Experiment station and was partially supported by the
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