Abstract: A separator (1) of a boiler drum for separating steam and water, which separator (1) has a separating chamber (5) having a fluid inlet (2) at the bottom of the separating chamber (5) and a steam outlet (3) at the top of the separating chamber (5) and spiral vanes (9) are attached to the wall (6) of the separating chamber (5) between the fluid inlet (2) and the steam outlet (3) for accomplishing circular motion of the incoming fluids and wherein a circular water outlet (4) surrounds the steam outlet (3). Top end (8) of the wall (6) of the separating chamber (5) within the water outlet (4) has a rounded top contour for ensuring smooth flow and keeping a water trap (13) filled up at the top art of the water outlet (4) and is inclined inwards. The inclination at the top end (8) of the wall (6) is concave.

Abstract: The invention comprises an apparatus and a method in a paper machine and a paper machine. According to the invention at least one deckle rail with strip form body of the forming table comprises openings for leading water between the deckle rail with strip form body and the stock layer and/or the deckle rail with strip form body and the wire.

Abstract: A method for fluidisation of a pulp flow in the headbox of a paper machine or such. The characteristics of the pulp flow are affected in the headbox's fluidiser (14) in one step only, whereby the height (h1) of the step is at least equal to the average fibre length, and after the fluidiser (14) the biggest permissible step expression in the flow channel in direction z is smaller than the average fibre length.

Abstract: The invention concerns a method for fluidisation of a pulp flow in the headbox of a paper machine or such. The characteristics of the pulp flow are affected in the headbox's fluidiser (14) in one step only, whereby the height (h1) of the step is at least equal to the average fibre length, and after the fluidiser (14) the biggest permissible step expansion in the flow channel in direction z is smaller than the average fibre length.

Abstract: A headbox (10) has a stock inlet header, a tube bank, a tubulence generator and a slice channel. Measurement targets (PA, PB, PC, P, PE) are provided with means for making measurements of the fiber mobility of the fiber suspension, then controlling the flow state of the suspension. Sensors on the width of the headbox (10) or traversing sensors are positioned on different width points of the headbox (10) and arranged to measure the fiber mobility profile, with means for changing the flow state on the basis of the measurements. Apparatus for diluting the thick stock into headbox consistency and units for cleaning the stock to be fed into the headbox may be provided. Sensors may be disposed in the short circulation pipes or cleaning units arranged to measure the fiber mobility of the fiber suspension with means for changing the flow state on the basis of the measurement data.