Freezing unit for pre-cooked food packages

Details Freezing unit for pre-cooked food packages Freezing unit for pre-cooked food packages

1980-11-14

1982-07-20

King, Lloyd L.

Refrigeration

Processes

Treating an article

62456, 62457, 62237, 62382, 34196, F25D 2500

Patent

active

043399282

ABSTRACT:
A freezing unit for use in a cold chamber to effect freezing of a load of pre-cooked food packages at a rate more rapid than the freezing rate of that load that would take place in the chamber in the absence of the unit. The unit includes a vertical plenum provided with a perforated wall and having an open input and a closeable output. The food packages are stacked in a rack adjacent the perforated wall of the plenum, with air spaces between the packages. Cold air drawn from the chamber atmosphere at a temperature below the freezing point of the food is forced into the input of the plenum to produce a positive pressure therein when the output is closed, thereby causing the pressurized cold air to penetrate the perforated plenum wall and pass through the air spaces in the stack at high velocity, the air returning to the cold chamber whereby rapid cooling of the packages is effected. By periodically opening and closing the plenum output, the cold air flowing through the air spaces assumes the form of air pulses separated by no-flow intervals to produce a heat transfer pattern within the food body in each package that results in a reduction in temperature which becomes substantially uniform throughout the body at a level close to the freezing point, whereby the body is caused to freeze, not in successive layers, but almost in toto within a short period, thereby avoiding the formation of large ice crystals.

REFERENCES:
patent: 2314301 (1943-03-01), Williams
patent: 2507834 (1950-05-01), Storer et al.
patent: 3261650 (1966-07-01), Stromquist
patent: 3545223 (1970-12-01), Elland
patent: 3866435 (1975-02-01), Frank et al.
patent: 4052589 (1977-10-01), Wyatt
patent: 4126775 (1978-11-01), Wyatt

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