# US 10,870,312 B2 · Decorative building board and method for producing such a building board > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,312 B2 - Document ID: US10870312B2 - Status: Granted - Kind: B2 - Application number: 15/757,916 - Filed: 2016-09-09 - Published: 2018-11-29 - Granted: 2020-12-22 - Earliest claimed: 2015-09-11 - Assignees: Knauf Gips KG - Applicants: Knauf Gips KG - Inventors: Stephan Klapperstück; Tobias Willing - Web page: https://patentgrep.com/patent/US10870312B2 ## CPC - B44C 5/04: Ornamental plaques, e.g. decorative panels, decorative veneers - B44C 5/043: {containing wooden elements} - B44C 5/0438: {containing stone elements} - E04C 2/043: {of plaster (E04C2/049 takes precedence)} - E04C 2/044: {of concrete (E04C2/049 takes precedence)} - E04C 2002/005: {Appearance of panels} - B44C: PRODUCING DECORATIVE EFFECTS (processes for applying liquids or other fluent materials to surfaces, in general B05D; shaping of plastics or substances in a plastic state B29C; printing processes to produce transfer pictures B41M3/12; thermographic duplication or marking methods B41M5/00); MOSAICS; TARSIA WORK (imitation of mosaic or tarsia work patterns B44F11/04); PAPERHANGING {(labels G09F; multi-step processes for making paper labels or tags B31D1/02)} - E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S) ## Abstract The invention relates to a method for the automated decoration of a building board, comprising at least one smoothing compound layer and preferably at least one colour coat. The method comprises the steps of smoothing and decorating the building board, wherein the smoothing includes the steps of (i) calibrating the building board to a nominal thickness, so that a surface of the building board has a height difference of at most 1 mm, (ii) applying a layer of a smoothing compound, (iii) pressing the smoothing compound into the surface structures of the building board, and (iv) recalibrating to the nominal thickness. Preferably, a plurality of smoothing compound layers are pressed into a calibrated surface of the building board and partially ground away again. The method is particularly well suited for the production of fire-resisting building boards. ## Claims ### Claim 1 A method for the automated decoration of a building board, comprising at least one smoothing compound layer, comprising the steps of smoothing and decorating the building board, wherein the smoothing of the building board includes at least the following steps: calibrating the building board to a nominal thickness, so that a surface of the building board has a height difference over an entire area of the surface of the building board of at most 1 mm applying a first layer of a smoothing compound on the surface of the building board pressing the smoothing compound into the surface structures of the building board recalibrating to the nominal thickness of the building board; wherein the building board is a gypsum-bound building board, a cement-bound fibreboard, or a mineral fibreboard. ### Claim 2 (depends on 1) The method according to claim 1, wherein between the step of pressing the smoothing compound into the surface structures of the building board and the step of recalibrating to the nominal thickness of the building board a further step of removing at least 10 wt.-% of the applied smoothing compound is carried out. ### Claim 3 (depends on 1) The method according to claim 1, wherein a second layer of smoothing compound is applied, wherein once again at least the steps of applying the smoothing compound and removing a part of the smoothing compound are carried out. ### Claim 4 (depends on 3) The method according to claim 3, wherein the same amount or less smoothing compound is applied and pressed in for the application of the smoothing compound of the second layer of the smoothing compound than in the case of the first layer of the smoothing compound. ### Claim 5 (depends on 3) The method according to claim 3, wherein a third layer of smoothing compound is applied, wherein once again at least the steps of applying the smoothing compound and removing a part of the smoothing compound are carried out. ### Claim 6 (depends on 5) The method according to claim 5, wherein at least one colour coat is applied on the last smoothed surface after recalibrating, and optionally provided with a cover layer. ### Claim 7 (depends on 6) The method according to claim 6, wherein a UV-light curable smoothing compound is used for the smoothing compound application and/or at least one UV-light curable lacquer is used for the at least one colour coat/or the cover layer. ### Claim 8 (depends on 3) The method according to claim 3, wherein at least one colour coat is applied on the last smoothed surface after recalibrating, and optionally provided with a cover layer. ### Claim 9 (depends on 8) The method according to claim 8, wherein a UV-light curable smoothing compound is used for the smoothing compound application and/or at least one UV-light curable lacquer is used for the at least one colour coat/or the cover layer. ### Claim 10 (depends on 1) The method according to claim 1, wherein the pressing-in of the smoothing compound and/or the removal of the smoothing compound is carried out by means of a roller. ### Claim 11 (depends on 10) The method according to claim 10, wherein a spacing between the roller for the smoothing compound application and a substrate, on which the building board to be coated is located, is adjusted less than or equal to the nominal thickness of the building board. ### Claim 12 (depends on 1) The method according to claim 1 wherein at least one colour coat is applied on the last smoothed surface after recalibrating, and optionally provided with a cover layer. ### Claim 13 (depends on 12) The method according to claim 12, wherein a UV-light curable smoothing compound is used for the smoothing compound application and/or at least one UV-light curable lacquer is used for the at least one colour coat/or the cover layer. ### Claim 14 (depends on 13) The method according to claim 13, wherein the at least one colour coat is produced by a roller application of the light curable lacquer and/or by a digital print. ### Claim 15 (depends on 1) The method according to claim 1, wherein the gypsum-bound building board is a plasterboard or a gypsum fibreboard. ### Claim 16 (depends on 1) The method according to claim 1, wherein the decorative building board at least meets the requirements of a fire resistance class B1 according to DIN EN 13501-1. ### Claim 17 (depends on 1) The method according to claim 1, wherein the decorative building board at least meets the requirements of a fire resistance class A2 according to DIN EN 13501-1.