Shading of paper
AssigneeStora Kopparbergs Bergslags AB
InventorBertil Ahlinder
Life of this patent
Estimating the term…
Abstract
A method and a color mixture for shading paper, and a shaded paper that comprises or consists of one or more layers made of the same or different pulps, which paper is intended to be used in connection with foodstuffs. The pulp or paper layer is treated with a color mixture of at least two optically cooperating pigments that are approved for foodstuffs, one of which is quinacridone red with the FDA registration details C.I. pigment violet 19, C.I. No. 73900 (Code of Federal Regulations, Food and Drugs, Title 21, Part 170-199), and constituting the primary component of the color mixture, in order to obtain a shaded paper with a value for the color coordinate b* that is between 0 and 3. The primary component may comprise between about 75-85 per cent of the color mixture with the rest at least one blue pigment, such as phthalocyanine blue.
Claims16
A method of shading paper for use in connection with foodstuffs, and having at least one layer of pulp, comprising:
- (a) treating the at least one layer, or the pulp before formed into the paper layer, with a color mixture of at least two pigments that are approved for foodstuffs, the primary component of the color mixture comprising more than 50 percent of the color mixture, and comprising quinacridone red with the FDA registration data C.I. pigment violet 19, C.I. No. 73900 (Code of Federal Regulations, Food and Drugs, Title 21, Part 170-199), so as to obtain a shaded paper with a value for the color coordinate b* that is between 0 and 3, suitable for use with foodstuffs.
A shaded paper having at least one layer, and for use in connection with foodstuffs, said at least one layer colored with a color mixture of at least two optically cooperating pigments that are approved for foodstuffs, the primary component of the color mixture comprising more than 50 percent of the color mixture, and comprising quinacridone red with the FDA registration data C.I. pigment violet 19, C.I. No. 73900 (Code of Federal Regulations, Food and Drugs, Title 21, Part 170-199), so that the shaded paper has a value for the color coordinate b* that is between 0 and 3, suitable for use with foodstuffs.
A color mixture for use in shading paper intended to be used in connection with foodstuffs, said mixture comprising:
- at least two pigments that are approved for foodstuffs, the primary component of the color mixture comprising more than 50 percent of the color mixture, and comprising quinacridone red with the FDA registration data C.I. pigment violet 19, C.I. No. 73900 (Code of Federal Regulations, Food and Drugs, Title 21, Part 170-199), capable of obtaining, when applied to a paper layer or pulp, shaded paper with a value for the color coordinate b* that is between 0 and 3, suitable for use with foodstuffs.
Dependencies are inferred from the claim text.