Cryogenic freezer

Refrigeration – Processes – Treating an article

Patent

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Details

62374, 62380, F25D 1306

Patent

active

040772268

ABSTRACT:
An isothermal cryogenic freezer tunnel for supplying cryogenic gas to the food to be frozen at a temperature which is substantially uniform along a major portion of the length of the freezer tunnel. The freezer tunnel is equipped with an overhead duct having downwardly-directing flow apertures. A foraminous conveyor is located below the duct for accommodating the conveyorized passage of food through the tunnel. Spray nozzle means are mounted in the tunnel adjacent the inlet of the duct for ejecting cryogenic gas into the tunnel. The tunnel further includes fans positioned in vertical alignment with the flow apertures for propelling the gas through the duct onto the conveyorized food where the gas at a substantially constant temperature, blankets, impinges and freezes the food.

REFERENCES:
patent: 2286225 (1942-06-01), Noyes
patent: 3282067 (1966-11-01), Dreksler
patent: 3376710 (1968-04-01), Hirtensteiner
patent: 3398788 (1968-08-01), Brunson
patent: 3403527 (1968-10-01), Berreth et al.
patent: 3455120 (1969-07-01), Schlemmer
patent: 3494140 (1970-02-01), Harper et al.

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