rakelstaong foer volumerisk dosering av belaeggningsaemne.

摘要

In known doctor rolls for the volumetric metering of coating material, in particular onto running paper and cardboard webs, the outer surface has elevations and depressions. The new doctoring roll permits low application weights to be used in a streak-free manner without damage occurring to the roller surface when applying onto a roller. For this purpose, the surfaces of the elevations (2) are level and are located in a cylindrical envelope surface, the sum of the surfaces of the elevations (2) is 10%-50% of the cylindrical envelope surface and the profile depth Pt (2.5 mm) of the entire surface in accordance with DIN 4771 has a value between 30 mu m and 150 mu m. IMAGE