L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

Willy Frederick

Franck Cousin

Pierre Kowalewski

Nicolas Fachon

Didier Alo

Jean-Pierre Bernard

Maryline Perrot-Minot

Alexandra Chapon

Method for cooling a product, all or part of the cooling being carried out by contact of the product with a mixture of carbon dioxide snow (CO2) and liquid nitrogen.

Use of a mixture of carbon dioxide snow and liquid nitrogen in quick freezing applications

The subject of the invention is a method for shaping at least one food product by cryoextrusion, the extruder being provided with a double-walled jacket surrounding the extrusion screw and through which jacket a coolant flows, this jacket consisting of a single module or several independent modules, the cryoextrusion being temperature-regulated on the basis of a curve, determined for said product to be cryoextruded, representing, plotted on the X-axis, the difference D between the actual temperature of the product and the desired temperature setting for the product at the exit and, plotted on the Y-axis, the setting to be applied for the gas temperature at the exit of the module or modules, the curve being split into three linear zones: an abrupt (steep-slope) zone, around a difference D close to 0, surrounded by two quasi-plateau zones.

Method for shaping a food product by cryoextrusion employing predictive temperature regulation

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Clerac, France

Willy Frederick