| 摘要 |
To apply a liquid or paste coating to the surface of a moving web (2), of paper or cardboard, one fourdrinier of the two fourdriniers (1,3) flanking the web is removed from at least one web surface directly before the coating is applied. Directly after coating, a fourdrinier is returned to the coated side of the web. The replacement fourdrinier is identical to the detached fourdrinier. The fourdrinier is detached from the web (2) surface and returned to it by an assembly of preferably three deflection rollers (10-15). The fourdrinier movements from and back to the web surfaces are effected on both sides of the web, before and after the coating applicators (6,8). The coating medium is in a different composition for each side of the web. The web is supported during surface coating. At least one coating is an application dye with or without a filling material, and at least one coating is of starch. An Independent claim is included for a papermaking machine with at least one deflection assembly to detach a fourdrinier (1,3) from the web (2) surface, directly in front of a coating applicator (6,8), and return the fourdrinier after the applicator to the coated surface of the web. The fourdrinier returned to the coated surface of the web is identical to or different from the fourdrinier detached from the web in front of the coating applicator. The fourdrinier applied to the coated web surface can have a finer pore structure than the fourdrinier lifted away from the web in front of the coating applicator. A web support, in the form of suction boxes (7,9), is at the side of the web (2) away from the coating applicators (6,8). The coating applicator (6,8) is a doctor unit, with a doctor blade or roller, or it is a spray.
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