Abstract: Device and method for draining a web in a paper production machine. The device may include a press section having at least one press nip for draining and smoothing the web. The at least one press nip may be arranged to smooth one surface of the web more than its opposite surface and the device may also include a roughening device that roughens the one surface of the web. The method may include guiding the web through a press section of the paper production machine to drain and smooth the web in which the press section include at least one nip, smoothing one surface of the web more than its opposite surface in the at least one nip, and roughening the one surface.

Abstract: A method for the treatment of a material web and a press arrangement with a plurality of press gaps. A roll has a flexible press jacket supported from an inside, and forms a respective press gap with each of at least two further driven rolls. The drive power, or speed of one of the driven rolls, is regulated in accordance with a predetermined desired value, to ensure a common speed of the driven roll. A maximum line force and/or drive power of a front press gap, considered in a web running direction, is controlled and/or regulated, at least within a certain range, in accordance with a maximum line force, or drive power, of a rear press gap, considered in the web running direction.

Abstract: A method in a paper machine for transferring a paper web from a wet wire in a former section to a pick-up fabric or an equivalent transfer fabric of a press section, including the steps of forming a pick-up point on the wet wire and separating an edge strip from at least one edge of the web prior to the pick-up point by means of at least one cutting device. The method further includes separating the web from the wet wire and passing the web onto the pick-up fabric at the pick-up point. The method also includes applying a pressure difference to the at least one edge strip through the wet wire or the pick-up fabric at or after the pick-up point to cause the at least one edge strip to either follow the wet wire or become separated from the pick-up fabric after the pick-up point and to be placed in a broke system arranged beneath the paper machine.

Abstract: Press section of a machine for producing a fibrous web and process for pressing a fibrous web. The press section may include at least two shoe press units including at least one press shoe and a revolving flexible press belt, a counterpart face, at least two nips having a length extended in a web travel direction and formed by each at least one press shoe pressing the revolving flexible press belt against the counterpart face. A length of the extended nip may be at least substantially the same as a length of the at least press shoe length, measured in the web travel direction, forming the extended nip and at least one of the shoe press units having press shoe length different from the other shoe press units, whereby various extended nip length are formed.

Abstract: Suction roll for the formation or treatment of a material web that includes an outer suction roll jacket comprising a perforated rotating hollow cylinder, a non-perforated support body arranged to extend through the outer suction roll jacket and to support the outer suction roll jacket at at least one point of its axial extent, and sealing ribs arranged to extend radially between the support body and the suction roll jacket and axially over a full length of the suction roll jacket. In this manner, the support body is adapted to rotate at a same speed as the suction roll jacket. The support body can include an axially extending, through-going bore arranged concentrically with the outer suction roll surface. An axially extending, rotationally fixed yoke extends through the through-going bore, and the rotationally fixed yoke has two ends which are supported outside of the support body on a frame. At least one support element is arranged to support the support body on the yoke.

Abstract: An arrangement and method for calendering a board web including a calender providing a hot and hard calendering nip formed by two calender rolls and through which the board web passes. At least one of the calender rolls is arranged to be heated to such a temperature that the surface layer of the board web placed at the side of this roll reaches its vitrification temperature in the calendering nip. A film press is arranged directly before the calendering nip in the direction of transfer of the board web and includes a film press nip through which the board web is passed. The film press nip is arranged to transfer a liquid layer onto the face of the board web so as to moisten the board web. The board web is transferred from the film press nip into the calendering nip while the surface layer of the web is at the moisture level determined by the film press in view of producing a controlled moisture gradient.

Abstract: A press section of a paper machine, in particular for printing paper qualities whose grammage is in the range of about 40 g/m2 to about 80 g/m2 is disclosed. The press section comprises a pick-up roll having a suction zone on which a paper web is detached at a pick-up point from a forming wire and is passed on the pick-up felt into a first press nip in the press section. In the first press nip, the pick-up felt acts as a press fabric. The press section further includes an extended nip placed after the first press nip. Into this extended nip, the web is passed as a closed draw on support of a fabric face or roll face. The first nip in the press section is a roll nip with relatively low load and acts as a front nip. In the area of the first press nip, almost or approximately one half of the total amount of the water contained in the web entering into the front nip is removed from the web. The extended nip, which is the second press nip in the press section, is formed against a smooth-faced back-up roll.

Abstract: A method for calendering the sheet material web includes carrying the sheet material web on one or more carrier fabrics through the calender nip formed by the first and second calender rolls and applying a load to the carrier fabric, and sheet material carried thereby, so as to reduce the thickness of the sheet material web.

Abstract: This invention relates to calendering systems. Such structures of this type, generally, employ the use of hard and soft nips to provide excellent smoothness without gloss mottle.