Patent ID: 7718207

Claim:
A process of preparing a smoke-impregnated tubular casing comprising: (a) providing a tubular casing having interior and exterior surfaces, said tubular casing being suitable for encasing food fillings having a form selected from one of liquid and paste, and said tubular casing with a water-barrier layer and a PVDF (polyvinylidene fluoride) oxygen-barrier layer being a cellulose fiber tubular casing; (b) applying to the interior surface of said tubular casing a mixture comprising, (i) liquid smoke, (ii) browning agent, and (iii) optionally water; (c) allowing said mixture to remain in contact with the interior surface of said tubular casing for at least 5 days; and (d) applying a water-in-oil emulsion to the exterior surface of said tubular casing, said water-in-oil emulsion optionally comprising at least one of fungicides and preservatives: and (e) optionally shirring and watering the mixture treated casing, thereby forming said smoke-impregnated tubular casing.