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US 6,797,015 B1Granted
Method for producing transparent, colored cellulose sleeves
AssigneeWolff Walsrode AG
InventorsKlaus-Dieter Blumenberg, Willi Neuschulz
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AssigneeWolff Walsrode AG
InventorsKlaus-Dieter Blumenberg, Willi Neuschulz
Estimating the term…
Process for producing dyed, tubular food wrappings from non-woven fabric coated with regenerated cellulose, characterized in that an alkaline dye liquor containing at least one dye which has been previously converted into an alkali-soluble form by chemical reduction and which can be converted into its insoluble form by oxidation is admixed to the viscose solution used for the production of the layer of regenerated cellulose, a tubular non-woven fabric is coated with the mixture of viscose solution and dye liquor, the viscose is coagulated and regenerated to form cellulose hydrate gel and the dye distributed in the viscose is reconverted into its insoluble form by oxidation; tubular food wrappings produced by this process and their use as synthetic casings for sausages.
Process for producing dyed, tubular food wrappings from non-woven fabric coated with regenerated cellulose, characterized in that an alkaline vat dye liquor containing at least one vat dye which has been previously converted into an alkali-soluble form by chemical reduction with an aqueous solution containing sodium sulfide and carboxymethyl cellulose and which can be converted into its insoluble form by oxidation is admixed to the viscose solution used for the production of the layer of regenerated cellulose, a tubular non-woven fabric is coated with the mixture of viscose solution and vat dye liquor, the viscose is coagulated and regenerated to form cellulose hydrate gel and the vat dye distributed in the viscose is reconverted into its insoluble form by oxidation.
Dependencies are inferred from the claim text.