SEED AND ARRANGEMENT FOR THE CALCULATION OF THE BAD SITES OF A TRAINING MATERIAL BANK IN TWO AFTER THE FOLLOWING INSTRUCTIONS

摘要

The invention concerns a method and an arrangement for covering both sides of a moving material web, for example, a paper web, with aqueous coating composition at two consecutive coating stations, wherein the first coating station - looking in the direction of travel of the web - contains a counter roll and a coating arrangement, so that the side of the web away from the counter roll is covered with the coating composition by means of said coating arrangement. After this, the web is taken to a nearby roll constituting the counter roll in the other coating station, where the other side of the web is covered. The envelope surface of the counter roll at the second coating station is held at such temperature that a condensate film is maintained between the envelope surface and the web lying against it. According to the invention, a water film is created entirely or partially by condensation by a separate controlled supply of warm moist atmosphere to at least one part of the zone of the envelope surface of the counter roll at the second coating station, which temporarily does not lie against the paper web. In this way, a uniform, thin and controllable water film can be formed between counter roll and paper web, which film by suitable control and/or regulating elements can be made to take up an optimal quantity regardless of possible variations in the moisture content and temperature of the paper web, coating mixture and surrounding air. IMAGE