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US 12,071,726 B2Granted
Barrier layer for cellulose substrate
AssigneePapacks Sales GmbH
InventorTahsin Dag
Life of this patent
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Abstract
In a method for the production of coated substrates, a flowable, biologically degradable first coating which enhances gas tightness is applied to a cellulose-containing substrate. To obtain a packaging consisting only of natural components and offering good tightness, a second watertight coating made of animal and/or vegetable waxes and/or lipids is applied to the first coating.
Claims7
A method for the production of coated substrates, comprising:
- molding a three dimensional cellulose-containing substrate using a pulp molding process;
- preparing a flowable and biodegradable first coating comprising cellulose and denatured casein, wherein the denatured casein is obtained by reacting casein with a denaturing agent, wherein the denaturing agent is calcium hydroxide, wherein the denatured casein is water-repellent, wherein the cellulose and the denatured casein are dissolved in water;
- applying the flowable and biodegradable first coating increasing gas-tightness to the cellulose-containing substrate;
- solidifying and drying the first coating;
- and
- applying a second waterproof coating comprising an oil and/or wax composition, wherein the oil and/or wax composition comprises animal and/or vegetable waxes, and/or lipids, to the first coating.
3 more elements
Dependencies are inferred from the claim text.