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1 Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent.
Food Processing | Freezing Foams 40. â  The ï¬ nal stage, freezing, is typically a two stage-process. - First, in the soft serve stage, the mixture is frozen in a continuous. freezer where it is also whipped so that small bubbles of air become. trapped in the aqueous solution, forming a foam.