A technique of freeze drying at atmospheric pressure was developed and used to test dry milk, some fruit juices, and solutions of coffee extract. Samples of the same food products were also freeze dried in vacuum. The influence of certain product characteristics, notably dimensions and concentration, on the mechanisms of the freeze drying operations are discussed, comparing the atmospheric technique to the vacuum process.
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Osei Boeh-Ocansey (1983) studied this question.
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