Patent EP-2253606-A2 (EP)
Inventor: ZANGHELLINI GERHARD
IPC: C04B41/83
Filed: 2010-05-17
Abstract: The method for repairing damage of a ceramic tile surface (4) formed on the visible side, comprises forming a recess (21) in the area of the damage, introducing or filling a first hardenable material into the recess and then hardening the first hardenable material, again removing a layer of the filled and hardened first material, which adjoins at the outer surface of the filled and hardened material lying on the visible side of the ceramic tile, and filling a second hardenable material into the formed recess and then hardening the second hardenable material. The method for repairing damage of a ceramic tile surface (4) formed on the visible side, comprises forming a recess (21) in the area of the damage, introducing or filling a first hardenable material into the recess and then hardening the first hardenable material, again removing a layer of the filled and hardened first material, which adjoins at the outer surface of the filled and hardened material lying on the visible side of the ceramic tile, filling a second hardenable material into the formed recess and then hardening the second hardenable material, again removing a layer of the hardened second material, which adjoins at the outer surface of the filled and hardened material lying on the visible side of the ceramic tile and is thinner than the total layer thickness of the hardened second material, and filling a third hardenable material into the formed recess and then hardening the third hardenable material. The second hardenable material contains the first hardenable material and additional color pigments. The third hardenable material contains the first hardenable material and additional color pigments, which differ from the additional color pigments of the second hardenable material. The recess is undercut-formed in the area of the damage, in which the hardenable material is introduced. All side walls formed from the material of the ceramic tile and limiting the recess are formed in an undercut manner. The ceramic tile has a ceramic base body (1) and a surface layer (2, 3) covering the ceramic base body on the visible side of the ceramic tile. The undercut formation of the recess begins a depth, which corresponds to the depth of the limiting surface between the base body and the surface layer adjoining to it or is less than the depth of the limiting surface. After the formation of the recess in the ceramic tile in the area of the damage and before introducing the hardenable material, silanol groups are introduced at the walls of the recess, where the silicon oxide (SiO x) is introduced in addition to the silanol groups. After the introduction of the silanol groups and before the introduction of the hardenable material, the walls of the recess are silanized. The hardenable material is light-hardenable. After the recess is filled with the hardenable material, the hardened material is hardened and the surface of the hardened material is surface-smoothed with the visible-side forming surface in the area adjacent to a repair point, a layer of the hardenable material is applied once again, where the thickness of the applied hardenable material layer is less than the layer thickness of the surface layer adjacent to the visible side of the tile. The hardening of the once again applied hardenable material takes place in two steps after surface-smoothing, where glycerin gel is applied after a first light hardening and a second light hardening is carried out by the glycerin gel. For the formation of a flat surface on the layer of the hardenable material, which is applied after the surface-smoothing, a film is placed before hardening and is removed again after the hardening. For the formation of a structured surface, the layer of the hardenable material, which is applied after the surface-smoothing, is structured before the hardening.