Grease masking packaging materials and methods thereof
View Patent ↗The present invention relates generally to the packaging materials. More specifically, the invention relates to materials and methods suitable for use as packaging materials whereby the appearance of grease, fat or oil staining on the packaging material is reduced or eliminated.
1. A method of making a packaging material, comprising:
providing a grease, fat and oil permeable substrate suitable for use as a packaging material, the substrate having an inner surface and an outer surface;
selecting a dark colored layer that is permeable to grease, fat and oil, the dark colored layer comprising a dark colorant-containing solution, the dark colorant-containing solution comprising
from about 0.05% to about 0.06% by weight of non-metallic black pigment,
from about 93% to about 95% by weight of water,
about 5% by weight of starch,
the dark colored layer not capable when applied by itself to the substrate of masking stains from grease, fat or oil applied to the inner surface of the substrate;
selecting a light colored layer that is permeable to grease, fat and oil, the light colored layer comprising a light colorant-containing solution, the light colorant-containing solution comprising
from about 28% to about 45% by weight of Kaolin Clay 1,
from about 17% to about 72% by weight of titanium dioxide,
from about 60% to about 65% by weight of non-metallic light colored pigment,
from about 2% to about 2.5% by weight of soy protein,
from about 30% to about 38% by weight of a latex binder,
the light colored layer not capable when applied by itself to the substrate of masking stains from grease, fat or oil applied to the inner surface of the substrate;
applying the dark colored layer on the substrate;
applying the light colored layer on the dark colored layer;
wherein said steps (b) and (c) each include the step of selecting a dark colored layer and selecting a light colored layer that, when applied according to steps (d) and (e), result in a structure that masks stains from grease, fat and oil applied to the inner surface of the substrate.
2. The method of claim 1 , wherein the step of providing a grease, fat and oil permeable substrate suitable for use as a packaging material includes the step of selecting a grease, fat or oil permeable substrate that comprises paperboard, paper or fabric.
3. The method of claim 2 , wherein the step of providing a grease, fat and oil permeable substrate suitable for use as a packaging material that comprises paperboard includes the step of selecting a paperboard that comprises one or more of: SBS, SUS or recycled paperboard.
4. The method of claim 1 , wherein the step of providing a grease, fat and oil permeable substrate suitable for use as a packaging material includes the step of selecting a packaging material suitable for use in packaging human food, animal food, drugs or cosmetics.
5. The method of claim 1 further comprising the step of forming the packaging material into a wrap, pouch, bag, box, cup, tray, plate, can, tube or bottle, thereby forming an article.
6. The method of claim 1 , further comprising the step of applying a printed layer adjacent to the outer surface of the light colored layer.