Patent ID: 6872282

Claim:
Process for the production of surface-finished paper or board (B W ), said process comprising applying to a surface of a hydrophilic paper or board sheet (B) an aqueous solution (L W ) consisting of water and a surface-finishing active ingredient (W), in which the surface-finishing active ingredient (W) consists of (W 1 ) polyethylene glycol with an average molecular weight {overscore (M)}w greater than 1500 or said polyethylene glycol (W 1 ) and at least one further additive selected from the group consisting of a finishing additive (W 2 and/or W 3 ), a non-finishing additive ((W 4 ), a non-finishing formulation additive (F), and mixtures thereof, wherein the finishing additive (W 2 and/or W 3 ) is selected from the group consisting of at least one dye and/or an optical brightener (W 2 ), a wet strength additive (W 3 ), and mixtures thereof wherein the non-finishing additive (W 4 ) is an agent for pH adjustment, and wherein the wet strength additive (W 3 ) is selected from the group consisting of (W 3 ′) a crosslinkable product of formaldehyde or glyoxal with urea or melamines, (W 3 ″) and mixtures thereof, and wherein the non finishing formulation additive (F) is selected from the group consisting of an antifoam (F 11 ), an agent for protecting against the damaging effect of microorganisms (F 12 ) and mixtures thereof, and, smoothing and drying said surface treated paper or board sheet through smoothing rolls.