Importance

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Abstract

A machine for coating a sheet material having an impervious surface and for impregnating as well as coating a porous web with high viscosity filling and coating materials in aqueous or non-aqueous suspension form. The machine has a smooth web support in the form of a flat table or, alternatively, a rotating drum, and an applicator in the form of an inverted box forming one or more pressure chambers extending across the table and under which the web is fed over the web support. The walls of the applicator, which extend across the table, form at least first and second blade elements adjustably positioned with their lower edges in close proximity to the table surface. The lower edge of the first is positioned above the table a slightly greater distance than the lower edge of the second. When coating material is deposited in excess across the web in front of the first blade element, the material thus carried on the web may enter the applicator under the first blade element at a rate faster than it may leave under the second blade element, thereby building up its pressure in the chamber, which drives the material into the web to impregnate it. The machine may have a second pressure chamber with a third blade element to apply a second coating over the first and be combined with a web former and associated equipment, such as fiber pre-bonding and drying equipment, so as to produce a coated or a filled and coated end product from its basic components, depending on whether the substrate to be treated is non-porous or porous.

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First Claim