Abstract: For profiling a fiber web (W) a shoe roll (10) defines a roll nip (4) with an opposite counter-roll (3). The shoe roll (10) has a static roll frame (5), a shoe element (2) located at the roll nip (4) and an endless belt (6) rotating about the shoe element (2) and the static roll frame (5). A lubricating cycle (71) is provided between the endless belt (6) and the shoe element (2) in the roll nip. The surface of the web (W) is profiled in the nip by loading the loading element (8). Before or after the shoe element (2), the shoe roll (10) has a longitudinally extending profiling strip (1) which can be pressurized to be able to perform thickness profiling of the surface of the fiber web (W). The static roll frame (5) and the shoe element (2) the endless belt (6) rotate about the profiling strip.

Abstract: The invention relates to an arrangement for profiling a fibre web (W) with a shoe roll (10). The shoe roll (10) has an opposite counter-roll (3), with a roll nip (4) between the shoe roll and the counter-roll. The shoe roll (10) has a static roll fram (5), a shoe element (2) located at the roll nip (4) and an endless belt (6) rotating about the shoe element (2) and the static roll frame (5). A lubricating cycle (71) is provided between the endless belt (6) and the shoe element (2) in the roll nip. As the fibre web (W) passes through the roll nip, its surface is profiled by loading the loading element (8). Before or after the shoe element (2), the shoe roll (10) has a profiling strip (1) extending substantially from one end to the other of the other of the shoe roll in the longitudinal axis direction of this. The profiling strip (1) can be pressurised so as to be able to perform thickness profiling of the surface of the fibre web (W).

Abstract: The apparatus for controlling the curling of paper or paperboard comprises members for bringing liquid on a paper or paperboard web (W) and members for spreading the amount of liquid evenly, in such a manner that the members for bringing liquid on the paper or paperboard web (W) are in the travel direction of the web placed before the members for spreading the amount of liquid evenly. The invention also relates to a method for controlling the curling of paper or paperboard.

Abstract: A method and apparatus for coating a paper or a paper board web, comprising spreading coating mix having a solids content of 55-75% on the surface of the web with a nozzle applicator, levelling and metering the spread coating mix on the surface of the web by a doctor element capable of producing a high hydrodynamic force on the coating layer between the doctor element and the web, the doctor element being located downstream of the applicator so that the dwell time between the spreading of the coating mix to the metering is 72-2400 ms. The web speed is preferably 100-1000 m/s. A good smoothness and coverage is achieved by this method due to long dwell time.

Abstract: A method and apparatus for producing paperboard, the method comprising the steps of applying a coating mix layer having a thickness greater than that of the final coat thickness to the surface of the web being coated using a coating mix formulation in which the solids content is at least 55%, passing the web with the coat applied thereto to a doctor blade located downstream in the travel direction of the web at a distance from the applicator apparatus such that the dwell time from the application step of the coating mix to the doctoring step is at least 130 ms, and smoothing the coat layer to its final thickness by means of a doctor blade. By this method a smooth surface can be obtained even on high coat weights.

Abstract: Method and apparatus for coating a moving paperboard web with at least two coating layers. A first coating layer is applied onto the surface of the web and a second coating layer is applied onto the surface of this first undried coating layer. The first coating layer is applied by means of a film transfer coater and the second coating layer is applied by means of a nozzle applicator, whereby the first layer is neither mixed nor doctored off the web during the application of the second layer.

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.