This invention relates to a tubular casing of cellulose hydrate having a coating on its inner side composed of a mixture of substances cross-linked by chemical reaction, which mixture is obtained when an aqueous liquid containing A. 1 to 10 per cent by weight, calculated on the total weight of the liquid, of a water-soluble aminoplast precondensate, B. 1 to 4 per cent by weight, calculated on the total weight of the liquid of a fluorine-containing two-component system from .beta..sub.1. polymers of fluorine-containing ethylene imines of the general formula ##SPC1## Wherein R.sub.f is a straight or branched, saturated perfluorinated carbon chain with 6 to 10 carbon atoms, and a = 1 or 2, or polymers from mixtures of the said ethylene imines, dispersed in .beta..sub.2. fluorine-containing compounds of the general formula ##SPC2## Wherein R'.sub.f is a straight or branched, saturated perfluorinated carbon chain with 5 to 7 carbon atoms, b = 1 or 2, and c = 18 to 50 (corresponding to polyethylene glycol groups with an average molecular weight of about 800 to 2,000), or in mixtures of the above compounds, provided that, in the component B of the liquid, the ratio .beta..sub.1 to .beta..sub.2 is in the range from 40 : 60 to 60 : 40 per cent by weight, calculated on the total weight of the liquid, and C. a water-soluble cross-linking catalyst, is heated sufficiently to remove the portion of the liquid consisting of water and sufficiently to effect cross-linking, whereby the aminoplast precondensate and/or reaction products of the aminoplast precondensate and the constituents .beta..sub.1 and .beta..sub.2 of the component B are chemically bonded with the OH groups of the cellulose hydrate forming the tubular casing.
Disclosed is a packaging material, comprising a fibrous base web wherein at least a part of the fibers forming said base web include at least a partial coating of a mixture of chemical substances which comprise a predominant proportion of a chemical binder based on a synthetic water-soluble heat-curable cationic resin precondensate and of a minor proportion of at least one coloring chemical substance, the proportions being relative to the total weight of the mixture of substances. Also disclosed is a method of manufacturing this packaging material and a sausage casing made therefrom.
The invention relates to an optionally fiber-reinforced foodstuff casing based on cellulose hydrate, which is impregnated on the inside with a mixture containing 40 to 200 mg/m.sup.2 of an adhesive component and 20 to 2000 mg/m.sup.2 of a non-stick component. The ratio by weight of adhesive to non-stick component is between 4:1 and 1:4. The foodstuff casing is used as sausage casing, in particular for keeping sausage, which has a second packaging in the form of a film or is provided with a dip coating. The casing shows improved peelability.
