| 摘要 |
The invention relates to a method for producing a metallic pressed sheet or an endless strip, whereby a surface structure is produced by applying a mask for partial chemical passivation followed by chemical surface treatment. The invention also relates to a device for implementing said method. In order to significantly improve the reproducibility and the resolution of the mask obtained, the mask is produced from a UV-hardening lacquer which is applied by a suitable device. The resolution is improved by means of a nozzle matrix which sprays the UV-hardening lacquer in dots, the individual dots forming a pattern as a result of the overspraying thereof, thereby forming the mask to be produced. The UV-hardening lacquer is especially advantageous in that it can be removed from the surface very easily after the etching process, and enables a high reproducibility compared to the conventional screen printing methods. |
| 主权项 |
1. A method for the surface structuring of a metal press plate or endless strip used for pressing, comprising the steps of:
seating the press plate or endless strip on a work table with a flat surface to apply and harden a mask, wherein the press plate or endless strip is held on the flat surface by means of a vacuum generated by a vacuum device, and wherein the flat surface comprises a plurality of flat sub-surfaces each having a suction opening connected to the vacuum and the sub-surfaces are spaced apart in a regular two-dimensional array along the length and width of the flat surface in such a way that large press plates with a width of up to 3 meters and a length of up to 8 meters can be processed, applying the mask for partial passivation, comprised at least in part of a hardenable UV lacquer, with a spray head by means of a digitalized printing method, wherein the spray head is guided by means of a digitalized template, which is identical to the printed image of an impregnated paper used in a further pressing process, wherein the UV-hardening lacquer is preheated prior to the application and is applied at a constant temperature, the temperature of the UV-hardening lacquer being maintained at 50° C. to 100° C., wherein the spray head has a plurality of nozzles which are arranged in the form of a matrix and are actuated individually and a random selection of a nozzle from the matrix is made for the printing of a specified pattern dot to be printed, the randomly selected nozzle printing the dot when it passes over the area to be printed, and wherein the spray head is guided at a constant, short distance of 0.1 to 4 mm from the surface of the press plate or endless strip, at least partially irradiating the mask with a UV light source immediately after the application for hardening, chemically processing the surface of the press plate or the endless strip. |
