FIELD: food-processing industry, in particular, processes for preservation of animal food products.
SUBSTANCE: method involves removing about 60-70% of moisture from product to be dried by stepped reduction of pressure accompanied by freezing of product at each stage to minimum temperature corresponding to pressure at the given stage, and heating product between steps by means of working fluid to -5, -4 C; providing holding of product in frozen state at minimum temperature at each stage. Heating of product between stages is carried out with the use of inert gas, such as carbon dioxide or nitrogen. Frozen product holding time at minimum temperatures is increased with decrease of pressure at stages.
EFFECT: improved quality of end product.
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