Method and arrangement for the regulation of the layer thickness of a coating material on a web moved in its longitudinal direction

Abstract

The invention relates to a method and an arrangement for regulating the layer thickness of a coating material on a web moved in its longitudinal direction. The thickness of the layer is measured at several sites over the width of the web and a coating installation is regulated, such that the thickness of the layer is constant over the width of the web. The thickness regulation can be attained by means of intensity variations of electron beams, which vaporize a coating material. But it is also possible that several evaporator crucibles distributed over the width of the web are heated individually, such that a uniform coating results over the width of the web. With the aid of an additional transmission measuring instrument the composition of the coating material can also be regulated, such that it is constant over the width of the web.

Dependencies are inferred from the claim text.