Method of producing three-dimensional structural surfaces

A method of producing a three-dimensional structural coating made on basis of a decor paper for coating panels, the method comprising:

• printing a pattern on a décor paper with a printing machine equipped with at least one painting ink tank and at least one printing plate having a surface with an engraved pattern formed by engraved cells, having a form of ink micro-cells of varying sizes, such that the ink from the ink cells is transferred to the décor paper when it comes in contact with the printing cylinder, forming thereby the pattern on the décor paper, corresponding to the engraved pattern;
• drying the decor paper and the pattern printed thereon in a printer drying chamber;
• impregnating the décor paper with a layer of synthetic resin, in particular melamine and/or urea resins, such that the pattern printed on the décor paper is covered by the layer of synthetic resin;
• drying the décor paper with the layer in an impregnating line drying chamber;
• pressing the décor paper onto a panel by using a press plate with any working surface;
• wherein the step of printing of the pattern includes applying a mixture of printing ink, and a swelling agent in a form of microspheres, being encapsulated gas bubbles of sizes ranging from 2 μm to 180 μm, configured for increasing the volume of the microspheres under the influence of rising temperature;
• wherein the mixture contains between 0.3% and 45% by weight of the swelling agent;
• and
• wherein a maximum temperature in the step of pressing is higher than a maximum temperature in the step of printing and the step of impregnating, such that during the step of pressing, the synthetic resin is softened and once the temperature exceeds the activation temperature of the swelling agent, the volume of the microspheres increases causing thereby the formation of the three-dimensional structural coating made of synthetic resin corresponding to the pattern.