Abstract: A method for making a surface coated or impregnated paper or paperboard by applying an aqueous additive dispersion to the wet web between the press and drying sections of a conventional paper or paperboard making machine. The aqueous additive dispersion is pre-metered onto a transfer roll and is applied to the wet web at a pressure nip between the transfer roll and a back-up roll. High solids content dispersions can be applied at high web speeds without tearing the web. The use of a high solids content aqueous dispersion having a solids content substantially equal to the solids content of the wet web at the point of application permits the method to be performed without increasing the drying load and therefore at an unreduced speed.

Abstract: A multi-layer paper or paperboard construction that has good moisture vapour barrier qualities and mechanical strength and is easily repulpable. The construction permits the use of a very thin PVdC/butyl acrylate barrier layer by primer and laminant layers disposed on the inside surfaces of the paper substrates. The primer and laminant layers are a blend of a inorganic pigment dispersion and a styrene acrylate binder. The multi-layer construction has particular application as a wrapper to protect bulk rolled paper and paperboard prior to shipment from the paper mill and as a linerboard facing in corrugated boxes where liner packaging requires protection against water vapour.