Device and method for manipulating a fibrous web

A device for cutting a fibrous web in motion along a motion direction, which device comprises

• a first blower provided with a first flow-preventing element, said first blower made to produce a first blow from one or more first outlet openings, the first blow having a blow direction substantially opposite to the motion direction of the fibrous web, said first flow-preventing element comprises a first flow-preventing plate located at least partially at an angular position in relation to the travel direction of the web,
• a second blower provided with a second flow-preventing element to produce a second blow from one or more second outlet openings, the second blow having a second blow direction substantially in the direction of the motion direction of the fibrous web, said second flow-preventing element comprises a second flow-preventing plate located at least partially at an angular position in relation to the travel direction of the web,
• a friction element against which the fibrous web is arranged to be pressed at least partially due to the effect of said blows and flow-preventing elements due to the Coanda effect which causes a force component directed at the fibrous web perpendicular to a plane of the fibrous web to press the web against the friction element to apply a friction force to the fibrous web, the friction force resisting the motion of the fibrous web and decelerating the fibrous web, whereby the first and second blows are adapted to cut the decelerated fibrous web,
• whereby the friction element is located between the first and the second blower, whereby the blows are directed substantially away from said friction element such that at least a majority of the friction element is located on the backside of a plane defined by the outlet openings and the blow direction of each blow, and
• the friction element comprises a surface profile which deviates from a planar one and due to the effect of said blows and flow-preventing elements, a continuous underpressure is provided on the surface of the fibrous web on the side of the fibrous web that faces the friction element even when the fibrous web contacts the friction element during said pressing.