Device for applying a treatment medium, especially in foam form, to a running web of material

In a device for applying a treatment medium to a running web of material comprising a stationary application beam which extends transversely to the web of material and parallel to its surface, said beam resting with a sliding surface against the surface of the web of material directly in contact therewith and containing an inner chamber extended over its length;

• feed lines for the treatment medium leading into said chamber;
• a slot extending along the application beam, opening into the sliding surface;
• and a support arranged opposite the slot on the other side of the web of material for supporting the web of material travelling past the slot, the improvement comprising:
• the sliding surface having a convex shape;
• the support formed by a cushion with a closed surface which extends over the length and width of the slot;
• said cushion covering the edge of the slot;
• said cushion elastically resilient at least perpendicular to the sliding surface but support to be stationary overall;
• said cushion pressing the web of material against the sliding surface in the vicinity of the slot;
• and said web of material looped under the application beam on a looping angle such that the contact area of the web of material at the convex sliding surface is at least as large as the contact area of the cushion at the web of material.