Abstract: A method for processing pulp in an apparatus for washing and dewatering pulp, and a system for controlling this apparatus, the apparatus comprising two rotatable press rolls (102, 104) having a permeable outer surface (106, 108), and a vat (114, 116, 118), the press rolls (102, 104) defining a press nip (112) between them. The processing is determined by a set of variable operating parameters, which are adjusted and/or maintained during operation in response to deviations of measured values of control parameters in relation to their respective predetermined threshold values. The variable operating parameters include rotation speed of the press rolls. The control parameters include vat pressure and/or linear load.

Abstract: A method for processing pulp in an apparatus for washing and dewatering pulp, and a system for controlling this apparatus, the apparatus comprising two rotatable press rolls (102, 104) having a permeable outer surface (106, 108), and a vat (114, 116, 118), the press rolls (102, 104) defining a press nip (112) between them. The processing is determined by a set of variable operating parameters, which are adjusted and/or maintained during operation in response to deviations of measured values of control parameters in relation to their respective predetermined threshold values. The variable operating parameters include rotation speed of the press rolls. The control parameters include vat pressure and/or linear load.

Abstract: Apparatus for washing and/or dewatering cellulose pulp is disclosed including a movable permeable surface in a pulp transportation chamber having a chamber gap above the movable permeable surface, a pulp distributor for distributing pulp onto the movable permeable surface, a throttle having a throttle gap width and an adjustable throttle adjuster to remotely adjust the throttle gap width so that a volume of pulp flow into the pulp distributor is equal to or greater than the volume of pulp flow out of the distributor during operation.

Abstract: Apparatus for washing and/or dewatering cellulose pulp is disclosed including a movable permeable surface in a pulp transportation chamber having a chamber gap above the movable permeable surface, a pulp distributor for distributing pulp onto the movable permeable surface, a throttle having a throttle gap width and an adjustable throttle adjuster to remotely adjust the throttle gap width so that a volume of pulp flow into the pulp distributor is equal to or greater than the volume of pulp flow out of the distributor during operation.

Abstract: A method and apparatus for processing pulp is disclosed including opposed endless wires conveyed in the same direction and defining a web-forming space therebetween for dewatering the web, a pair of perforated dewatering tables supporting the endless wires for pressing the wires towards the web, the first perforated dewatering table ending upstream of the second perforated dewatering table, and a press roll downstream of the back end of the first perforated dewatering table and opposed to the back end of the second perforated dewatering table to form a nip between the press roll and the back end of the second perforated dewatering table, which has a profiled surface that interacts with the press roll to prolong the nip between the press roll and the back end of the second perforated dewatering table.

Abstract: A method and apparatus for processing pulp is disclosed including opposed endless wires conveyed in the same direction and defining a web-forming space therebetween for dewatering the web, a pair of perforated dewatering tables supporting the endless wires for pressing the wires towards the web, the first perforated dewatering table ending upstream of the second perforated dewatering table, and a press roll downstream of the back end of the first perforated dewatering table and opposed to the back end of the second perforated dewatering table to form a nip between the press roll and the back end of the second perforated dewatering table, which has a profiled surface that interacts with the press roll to prolong the nip between the press roll and the back end of the second perforated dewatering table.

Abstract: A frame for a twin-wire press is disclosed including pairs of side members including upper and lower side members arranged on opposite sides of the press, between which upper and lower rolls are attached, a plurality of transverse beams arranged between the pairs of side members which themselves are sections of flat sheet metal and spacers for mutually releasably connecting the side members with the sheet metal being formed so that it permits a degree of curing in the vertical plane to facilitate access to the space between the upper and lower rolls. A method for exchanging wire in a twin-wire press of this type is also disclosed.

Abstract: Twin-wire presses are disclosed for dewatering fiber suspensions comprising endless upper and lower wires defining a dewatering space, upper and lower wire guides for guiding the wires obliquely towards the inlet end of the dewatering space, and upper and lower wedge-shaped seals extending from an inlet box towards the dewatering space inlet to create a seal in the tapering space between the wires and the fiber suspension entering the dewatering space. The inner surfaces of the wedge-shaped seals define a passage for the fiber suspension and the outer surfaces extend at an acute angle towards the inner surfaces so that at least part of the seals are sealed against the wires and the distance between the inner surfaces of the seals is substantially equal to the distance between the wires at the dewatering space inlet.

Abstract: Twin-wire presses for dewatering fiber suspensions are disclosed including upper and lower rolls and endless upper and lower wires running around the rolls, a pair of dewatering tables supporting the upper and lower wires and forming a dewatering space between them for initial pressing and dewatering of the fiber suspension, to form a fiber web between the wires, a roll engagement downstream of the watering tables, a final dewatering in a press frame, a press and lift arrangement for vertically adjusting the first dewatering table and a link system joined to the press frame and to an upper section of the first dewatering table which is movable from and against the second dewatering table by means of the press and lift arrangement thereby.

Abstract: A gas burner in which a burner head is positioned within an inner pipe that is surrounded by an outer protective pipe. Fuel is delivered to the burner head through a fuel conduit positioned within the inner pipe, and combustion air is delivered through the inner pipe. The fuel conduit terminates short of the burner head and the wall of that conduit is provided with a plurality of holes. A further pipe surrounds at least the perforated part of the fuel conduit, and one end of the further pipe extends to the the burner head while the other end is sealed against the fuel conduit to form a mixing chamber between the outside of the fuel conduit and the inside of the further pipe. A second conduit is provided to conduct a given amount of air to the mixing chamber.