Patent ID: 6910282
Filing Date: 2005-06-28
Classification: D21F

Abstract:
1. A method in a papermaking machine comprising the steps of: conveying a web, supported by a fabric over a first cylinder, wherein the web is between the first cylinder and the supporting fabric, the fabric having a first side adjacent the web, and a second side opposite the web; guiding the web supported by the fabric from an opening nip defining a disengaging point between the supporting fabric and the first cylinder, toward a roll, thus forming a web run between said first cylinder and said roll; supporting the web run from the opening nip, toward said roll by creating a negative pressure region on the fabric second side, the negative pressure being divided into a intensified negative pressure region close to the disengaging point between the supporting fabric and the first cylinder, and a less intense negative pressure region spaced from the disengaging point; increasing and decreasing the negative pressure in the intensified negative pressure region according to a function which is based on at least one parameter which acts on the runability of the web and which varies during the run, the at least one parameter chosen from the group consisting of: the web pulp composition, the web grammage, the web porosity, the web tension, the first cylinder temperature, so that a desired runability is maintained between the cylinder and the roll.