METHOD FOR WELDING, AT LEAST PARTLY, A COVERING WEB TO A CARRYING LAYER

摘要

At least one part of a top film is hf welded to the surface of a substrate. In the process an electrically conducting film is applied to the underside of the substrate; the top film is placed on at least the part of the substrate; an hf electrode is placed on the part to be welded of the top film; an earthed electrode is placed on the part of the top film which is not to be welded, or, alternatively, on a part of the substrate which is not covered by the top film, the area of this earthed electrode being greater than that of the hf electrode; the hf energy is applied and the hf electrode is pressed against the top film. The substrate can also be laid on an undermost layer of polyurethane foam.