Patent ID: 6793773
Filing Date: 2004-09-21
Classification: D21G

Abstract:
A method in a paper machine for passing a web from a press section to a drying section, wherein the drying section has at least one transfer suction roll for passing the web from a transport belt, felt, or support belt in the press section, in a closed draw to a wire of a first cylinder drying group of the drying section, the first cylinder drying group having a pocket formed between at least a first drying cylinder and a second drying cylinder, the pocket containing a vacuum box stabilizinig the travel of the web, and wherein the web is detached by aid of a negative pressure of between âˆ’35 kPa and âˆ’80 kPa. (âˆ’5.075 psi and âˆ’11.6 psi) created in the at least one transfer suction roll, from said transport belt, felt or support belt and the web is brought, with the aid of the negative pressure created by the transfer suction roll, into contact with a first wire of a cylinder drying group, and wherein the web is directed and supported by said first wire, over the first drying cylinder of the cylinder drying group and further from there, supported by a hitch roll, over at least the second drying cylinder, and the travel of the web from the first drying cylinder to the hitch roll is stabilized by the vacuum box, and wherein a tension difference between the press section and the drying section is adjusted to be in the region of less than 1% when the machine speed is greater than 600 m/min.