PROCESSES AND APPARATUS FOR COATING PAPER AND CARDBOARD AND AN APPARATUS FOR PERFORMING THEM

摘要

IMPROVEMENT TO PROCESSES AND APPARATUS FOR COATING PAPER AND CARDBOARD AND AN APPARATUS FOR PERFORMING THEM The thickness of the coating of an aqueous composition deposited in excess on a continuous strip of paper or cardboard supported by the lateral surface of a cylinder is regulated and regularized by removing the excess substance by scraping by means of at least two successively acting blades. The process makes it possible to obtain coatings of regular thickness, which are free from streaks and furrows, corresponding to quantities of dry material which are generally below 15 g/m2 to as low as 5 g/m2 without decreasing the viscosity of the coating baths.