Tubular packaging sheath and process for its manufacture
AssigneeHoechst Aktiengesellschaft
InventorFelix Rassbach
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Abstract
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.
Claims16
A packaging material, comprising a fibrous 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 major proportion by weight of a chemical binder based on a synthetic water-soluble heat-curable cationic resin precondensate and of a minor proportion by weight of at least one coloring chemical substance, and a layer of regenerated cellulose impregnating and coating said fibrous base web which is at least partially coated with said mixture of chemical substances, said packaging material being produced by a method comprising the steps of applying to at least one surface of said fibrous web a liquid containing a solids constituent comprised of said mixture of chemical substances, removing the liquid volatile constituent of said liquid, thereafter impregnating and coating the fibrous web with a viscose solution, and regenerating said viscose to produce said regenerated cellulose impregnated and coated fibrous web.
A process for the manufacture of a tubular packaging sheath, comprising the steps of:
- applying to at least one surface of a reinforcing fibrous web a coating liquid which contains a solids constituent comprising a mixture having a major proportion by weight of a synthetic water-soluble heat-curable cationic resin precondensate and a minor proportion by weight of a coloring chemical substance;
- removing the liquid volatile constituent of the liquid;
- forming a tube from the fiber web;
- impregnating and coating the tube with a viscose solution;
- treating the tube with a precipitating liquid for the viscose to regenerate the viscose;
- and
- washing the regenerated cellulose impregnated and coated tube.
Dependencies are inferred from the claim text.