Method and device for curtain coating a moving support

摘要

In the method for curtain coating a moving support with any kind of coating solution, the air which is carried along by the moving support is extracted in front of the curtain as seen in the running direction of the support in a gap which extends concentrically to the support, and air is continuously supplied in a controlled manner. In the process, the supplied air is regulated in function of the extracted air in such a manner that a parabolic velocity profile develops which comprises a point P at a distance d from the support where the air velocity is equal to zero. In the device implementing the method, this adjustment is essentially enabled by a porous layer which is disposed on the support side in a cavity to which a suction resp. an air supply channel is connected. In this manner, a uniform coating of high quality can be obtained.