Patent ID: 6193840
Filing Date: 2001-02-27
Classification: D21F,D21G

Abstract:
A method for producing surface-treated paper from a paper web which has been dewatered by pressing to substantially a first dry solids content of from about 35% to about 60%, comprising the steps of:drying the web in a forward dryer section by passing the web through only a plurality of successively arranged drying groups with single-wire draw that are open downward, each of said drying groups having steam-heated drying cylinders arranged in a first row and reversing suction cylinders arranged in a second row below said first row, the side of the web being dried being passed into direct contact with a face of said drying cylinders,passing the web from the forward dryer section to a finishing section,passing the web through at least one surface-sizer or coating device arranged in the finishing section,applying size from said at least one surface-sizer or a coating agent from said at least one coating device onto one or both sides of the web to treat the surface of the web,drying the web in an after-dryer section after the web has passed through said at least one surface-sizer or coating device, andreducing a curling tendency of the web that arises in the forward dryer section by passing the web through at least one calendering nip, each defined by a pair of rolls, and asymmetrically calendering the web in the at least one calendering nip to thereby affect the sides of the web to different degrees.