An imaging optical unit serves for imaging an object field in an object plane into an image field in an image plane. The material sheets are interlinked such that, when a first material sheet is extracted, a predetermined part of the next material sheet is fed out. Further, the sputter processes are conducted sequentially, without breaking the vacuum seat to minimize the absorption of water in the base coat layer that conventionally occurs between deposition steps. The at least one measuring device is adapted to detect, at a plurality of measurement locations, data relating to at least one measured parameter. A discharge gas is enclosed within a discharge space defined between the interposed barrier ribs. The reactive intermediates are prepared from natural triglyceride plant and animal oils containing unsaturation.