Process for coloring absorptive, rough surface paper
AssigneeTh. Goldschmidt AG
InventorHelmut Buhler
Life of this patent
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Abstract
A method for coloring, dyeing-in or inking absorptive, rough surface paper, particularly paper which is subsequently saturated and/or impregnated with a solution of a heat-hardenable synthetic resin and then dried and pressed on a substrate, such as, wood panels, with as thin as possible a layer of coloring agent having an optically uniform coloring, in which the paper is colored by applying a magnetic roller coloring process thereto and, before or after such coloring, the paper is printed by a copperplate intaglio printing process or a flexographic (flexo-relief) printing process.
Claims6
A process for coloring a web of rough surface paper having elevated areas and depressed areas to produce a solid-color paper having a layer of a single, predetermined coloring agent thereon, as thin as possible and optically uniform over its entire surface, comprising coating said depressed areas by providing a magnetic coloring roller which is rotatable, attractable by a magnet, free to move in a direction perpendicular to the line of travel of said web and carries a film of said coloring agent and a magnet impression roller which is rotatable and fixed against movement in a direction perpendicular to said web, passing said web between said magnetic rollers and simultaneously drawing said magnetic roller against said web by the magnetic attraction of said magnet roller to deposit said coloring agent in said depressed areas of said web;
- and coating said elevated areas by providing a second coloring roller which is rotatable, is fixed against movement in a direction perpendicular to said web and carries a film of said coloring agent on a pattern of closely spaced, small areas having a height differing from the general surface thereof and a second impression roller which is rotatable and is fixed against movement in a direction perpendicular to said web and passing said web under pressure between said second coloring and impression rollers to deposit said coloring agent on said elevated portions of said web.
Dependencies are inferred from the claim text.