US 4,839,201 A · Method and apparatus for applying coating liquid to a moving base

Abstract

Method and apparatus for applying coating liquid onto a moving base, such as paper or board web, the surface of a counter-roll or the like wherein the coating liquid is fed under pressure into a coating liquid chamber of a coating device defined by a coating member, a front wall, edge seals and by a region of the moving base to be coated. In order to seal the front wall of the coating device against the passage of air with respect to the moving base and/or to lubricate the front wall and moving base with respect to each other, a fluid material, such as a liquid, dispersion, solution or the like is fed to an inlet side of the moving base region forward of the base region and front member in the direction of movement of the base so that the fluid material moves substantially parallel to and in the same direction as the moving base.

Claims15

Dependent claims

A method for applying coating material onto a moving base, such as the surface of a paper or board web, a counter-roll, or the like, comprising the steps of:

feeding coating material under pressure into a chamber defined by a region of the moving base to be coated and a coating device, said coating device including a coating member extending substantially transversely with respect to the direction of movement of said base at one edge of said base region, and a front member extending substantially transversely with respect to the direction of movement of said base at a front edge of said base region forward of said one edge;
and
feeding a fluid material to an inlet side of said moving base region forward of said base region and front member in the direction of movement of said base so that said fluid material moves substantially parallel to and in the same direction as said moving base to seal said front member with respect to said moving base against the passage of air over said front edge of said base region and/or to lubricate said front member and moving base with respect to each other.

Apparatus for applying coating liquid onto a moving base, such as the surface of a paper or board web, a counter-roll or the like, comprising:

a coating chamber defined by a region of the moving base to be coated and a coating device, said coating device including a coating member extending substantially transversely with respect to the direction of movement of said base at one edge of said base region and a front member extending substantially transversely with respect to the direction of movement of said base at a front edge of said base region forward of said one edge;
means for feeding coating material under pressure into said coating chamber;
and
means for feeding a fluid material to an inlet side of said moving base region forward of said base region and front member in the direction of movement of said base so that said fluid material moves substantially parallel to and in the same direction as said moving base to seal said front member with respect to said moving ase to prevent the passage of air with respect to said moving base over said front edge of said base region and/or to lubricate said front member and moving base with respect to each other.

1 more element

Dependencies are inferred from the claim text.

Method and apparatus for applying coating liquid to a moving base

Life of this patent

Method and apparatus for applying coating liquid to a moving base

Life of this patent

Abstract

Claims15