- Air at -25oC and -35oC at a high velocity (2–6 m/s) pass through a 2–13 cm bed of food. - Perforated tray or conveyor belt is required. - Two stages operation : 1) Rapid freezing in a shallow bed to produce an ice glaze on the surface of the food 2) Freezing is completed on a second belt in beds 10–15 cm deep. - The shape and size of the food determine the thickness of the fluidised bed and the air velocity needed for fluidisation.
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