C

Noncondensibles

Noncondensibles

Refrigerant

Figure 1. Basic components of a simple one-shelf vacuum freeze drier. C = condenser.

Freeze drying and the properties of freeze-dried foods are greatly affected by how foods are frozen. Slow freezing is used to produce freeze-dried coffee dark enough to be accepted by consumers and to improve the rehydratability of freeze-dried fruits. Rapid freezing permits more rapid desorption of bound water, but also causes greater resistance to vapor flow during sublimation.

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