US 6,645,335 B1 · Surface treatment method in particular for improving barrier and printing properties of webs

Abstract

The present invention concerns a process for coating a web by applying a coating layer comprising pigment particles to the surface of the web. According to the invention, the coating layer is contacted at a preselected stage with a smooth surface, the coating layer is at least partially dried while being contacted with said surface to provide a smooth outer surface of the layer with densely packed particles, and the coating layer is separated from the smooth surface. The smooth surface of the web provided by the invention is ideal for printing or for secondary coating with polymers. Paper and board products according to the invention are easily reclaimed and can be treated in a normal pulper, because they do not contain any metal foils or polymer films.

Claims25

Dependent claims

A process for coating a web, according to which process

a coating layer comprising pigment particles is applied to the surface of the web, characterized in that
the coating layer is formed from an aqueous pigment slurry that comprises an at least partially hydrophilic pigment, the pH of the aqueous phase at a water content of less than 50% being ±10% of the value which gives the lowest Zeta potential to the slurry,
the coating layer is contacted at a preselected stage with a smooth surface,
the coating layer is at least partially dried while being contacted with said surface to provide a smooth outer surface of the layer with densely packed particles, and
the coating layer is separated from the smooth surface.

2 more elements

Dependencies are inferred from the claim text.

Surface treatment method in particular for improving barrier and printing properties of webs

Life of this patent

Surface treatment method in particular for improving barrier and printing properties of webs

Life of this patent

Abstract

Claims25