Losses in the Process. Losses in freezing occur from evaporation and from actual loss of pieces dropping from conveyors and becoming enmeshed in or stuck to belts, conveyors, elevators, or other machinery. Freezing in packages should avoid most of the losses. I doubt that these losses, percentage wise, are very large in a well-run operation.
Evaporation losses have loomed large in the battle between cryogenic and air-blast freezing of products in bulk. Just how important these losses are seems to depend, in the propaganda stage, on what one is selling. But let us try to remain objective and see what the facts are.
Evaporation losses, according to one equipment manufacturer, are largely
determined by two factors: (I) difference in vapor pressure between the product being frozen and the freezing medium, and (2) length of time the product is subjected to the freezing medium.