in solution or fine dispersion and are allowed to cool down in this liquid in the course of cooling the hot air remaining in the voids strongly contracts the result is a vacuum which causes the surrounding liquid to penetrate even into the finest voids if necessary this penetration of liquid can be improved still further by for example closing the dip container and additionally pressurizing with compressed air or pumped in liquid the sealing and or passivation has been chosen in such a way that it interferes neither with the deburring of the clothing wire nor with the subsequent antiwear coating nor with the final heat treatment the opening rollers removed from the impregnating bath are rinsed off clean at the surface surprisingly the sealing solution in the voids between the raw wire and the slot wall of the roller body is not replaced by the rinse water in a two stage heat treatment step first the solvent of the sealing liquid in the voids between the raw wire and the slot wall is slowly evaporated so that the substances present in the sealing liquid become deposited on the walls of the voids in the form of a film if necessary depending on the sealing solution used a further temperature increase is employed to modify the crystal structure and the surface constitution of the previously formed film in such a.