A process for the preparation of a thick film - heating element for a water-conducting domestic appliance and thick film - heating element for a water-conducting domestic appliance

摘要

A process for the preparation of a thick film - heating element (23) for a water-conducting domestic appliance, with at least one made from a sheet steel pipe section (19), whose cylindrical outer side a meandering heat-conducting track (25), and having its cylindrical inner side, a heating surface (29) is formed which, during the operation directly in contact with a liquid that is flowing past, the heat-conducting track (25) with the interposition of an insulating layer (33) is plotted on the cylindrical outside, and wherein the cylindrical outside an electrical connection (27) is arranged, which is in electrical communication with the heat-conducting track (25), in which the method of the pipe section (19) after the application of the heat-conducting track (25) in a heat treatment step (ii) is heat treated, characterized in that the heating surface (29) in a subsequent treatment step (iiia, iiib) is further treated by means of a laser exposure, wherein in the exposure to laser light exposure points (31) are produced, in which the surface material of the heating surface (29) is removed at least partially, with a diameter (d) and / or an amount of offset (a) in a range of between 0,1 and 1 mm and their number on the heating surface (29) in the case of greater than 25 points / cm² is.