Abstract: An arrangement in the headbox of a paper or cardboard machine has a pulp suspension feed system distributing the suspension over the width of the headbox. At least one first flow resistance element, such as an aperture plate and/or tube system, is provided with flow apertures, from which headbox the pulp suspension is passed via at least one chamber, such as an equalizing chamber and/or the slice gap of a slice chamber, onto a forming wire or equivalent. The arrangement comprises at least one pulp flow guide plate, preferably arranged mainly in the transverse direction of the headbox, having at least one groove formed in its guide surface.

Abstract: A device and a method for on-line control of the fibre direction of a fire web (8), being manufactured from stock delivered from a headbox (3) through a discharge opening (11) defined by movable lips (9, 10), while using a fibre direction meter (12) located downstream and actuating members (14), which are allonged long the lips for regulation of the discharge opening as a response to individual control signals, each being a function of measured fibre direction values; wherein a control unit (13) receives the measured fibre direction values, calculates the control signals, and transmits these to the actuating members. According to the invention, the control unit identifies an array of fibre direction values, originating from positions in the cross direction of the fibre web which correspond to the positions of the actuating members. The control unit then compares the array of fibre direction values with an array of desired fibre direction values.

Abstract: An object of the present invention is to provide a headbox for a paper machine in which correction of the fiber orientation of paper is possible over the entire width of the C/D direction, regardless of the slice width, and in which the fiber orientation in the direction of paper thickness can be corrected over the entire thickness of the paper.

Abstract: A paper/board machine headbox (10) has a stock inlet header (J), a tube bank (11), a turbulence generator (13) and a slice opening (14) which is provided with a profile bar. The headbox (10) is provided with cross direction measuring sensors (D1, D2; Dmn), by means of which the flow rate profile of the headbox (10) is determined, and the profile bar of the slice opening (14) of the headbox (10) is adjusted in the cross direction on the basis of the thus determined flow rate profile. The headbox (10) is provided with measuring sensors (D1, D2; Dmn) for determining the cross direction flow rate profile of the headbox (10) and with means for adjusting the profile bar on the basis of the flow rate profile.

Abstract: This invention relates to an improved structure of a head box for a paper making machine. The sidewalls of a nozzle of a head box shall be movable with the rotation of a roll transporting a forming wire of the paper making machine. Thus, the homogeneity of produced paper can be improved and the production rate of paper increased.

Abstract: Headbox for a machine and process for forming the same. The headbox includes a plurality of channels arranged in rows that extend across a width of the machine and in columns substantially perpendicular to the rows, at least one lamella positioned between adjacent rows, a fixing point for the at least one lamella, and lamellar supports positioned after the fixing point, relative to a headbox flow. This includes arranging a plurality of headbox channels into rows and columns, positioning a lamella between adjacent rows, fixing an end of the lamella at a fixing point, and arranging lamellar supports downstream of, relative to a headbox flow direction, the fixing point.

Abstract: The invention refers to a device for feeding a pulp suspension to a dewatering installation, particularly for a tissue machine. It is mainly characterized by one or several one-piece, wedge-shaped, steel lamella tip(s) being provided to separate the individual sectors in a two-layer or multi-layer headbox.

Abstract: Sheet formation system and method for reducing wavy edges in a fourdrinier machine. The system includes a headbox having a nozzle bring adapted to produce a pulp suspension jet across a width of the machine, at least one rotating screen positioned to receive the pulp suspension jet, and at least two deckle plates adjacent to the screen. The deckle plates may be adjustably positionable such that a distance between the deckle plates and a centerline of the screen is adjustable in a machine direction over a substantial portion of a length of the side shields. The method includes directing a pulp suspension jet onto the rotating shield between the deckle plates to form a web sheet, moving the web sheet in a machine direction, and adjusting a distance between the deckle plates as the web sheet is moved in the machine direction.

Abstract: Apparatus and method for controlling the size of a gap through which material is metered. The gap is defined by a rigid surface and a flexible surface connected to at least one actuator for deforming the flexible surface. A plurality of sensors are positioned along the rigid or flexible surfaces to detect the other of the surfaces and generate signals indicating its position. A computing unit in communication with the plurality of sensors processes the signals to generate a continuous gap measurement profile. The computing system also stores a pre-determined desired gap measurement profile. A control system in communication with the computing unit actuates the actuators to deform the flexible surface to adjust the gap measurement profile to correct any deviation from the desired gap measurement profile.

Abstract: A headbox is provided which provides an improved uniformity in the velocity profile of the stock solution across the slice opening. As a result, improved fiber alignment is provided across the width of the entire slice opening and mis-alignment of the fibers towards the outer edges of the slice opening is avoided. The headbox includes an improved nozzle design with pondsides that are not parallel to one another but which are angled inwardly as they extend from the tube bank to the slice opening. Further, several columns of outer tubes of the tube bank may also be angled inwardly as they extend from the header to the nozzle section. The center tubes would be disposed in a parallel relationship to one another. A sealing arrangement is provided between the roof of the nozzle section and the pondside which permits the incorporation of a double knuckle for extending and retracting the roof to adjust the L/b ratio.

Abstract: Headbox for paper machines, provided with an output channel in the form of a nozzle, with an output slot for producing a strip of pulp having the width of the machine. The output channel is delimited by two flow guide walls converging toward one another and as a rule by a rear wall. It is divided up into a number of channel sections (32), preferably autonomous, by subdivision of the flow guide walls into wall sections (30, 31) and preferably by subdivision of the rear wall into rear wall sections (37). Each channel section may have at least one input line (40) of its own, as well as (for adjusting the opening of the output slot) a section of part of the mobile wall (35) and an associated regulating system (38, 39).

Abstract: Apparatus for stabilizing a jet flow (J) discharged from a headbox slice channel (16) of a paper machine and for controlling the edge area of a paper or board web. In the flow direction (F) of the stock suspension, the slice channel (16) narrows and converges in the edge areas thereof, on both sides in cross direction of the web formed. The top wall (25) of an apron beam (24) forms the bottom wall of the slice channel (16). The slice channel (16) is defined by a planar top wall (14), which is hinge-jointed at the upstream edge of adjustment of the slice opening (15). At the level of the bottom wall (25), the slice channel (16) narrows and converges linearly from the full width (L.sub.max) of a turbulence generator (13) down to the width (L.sub.0) of the slice opening. At the level of the top wall (14) of the slice channel (16) the width of the slice channel (16) is essentially retained the same and equal to the width (L.sub.0) of the slice opening.

Abstract: A machine for making a fiber web with sharply defined edges, specifically a paper or tissue web, between a felt and a wire, features a headbox that dispenses the fiber suspension into a feed-in area formed between the felt and wire. The wire has a smaller width than the width of the fiber suspension stream dispensed by the headbox.

Abstract: A flowbox for a paper or board web-making machine is provided with at least one side wall movable along an axis at right angles to the direction of stock flow through the flowbox, whereby the width of the flowbox may be varied and the web deckled before it leaves the flowbox.

Abstract: An apparatus for forming a fibrous sheet, which apparatus comprises a first and a second endless wire for accomplishing a forming zone between mutually converging wires; a feed box with lips forming an outlet opening for feeding fibre suspension into the gap of the forming zone between the wires, the first wire being in an essentially tight contact with the first lip of the feed box, the second wire being in an essentially tight contact with the other lip of the feed box, and on both sides of the forming zone mutually essentially parallel side walls being arranged for tightening both sides of the forming zone against the wires; and rolls for guiding the wires, whereby the second wire is, at least along the sheet forming zone, arranged to run along the surface of a wire cylinder equipped with suction devices, whereby the first wire, which is guided from a breast roll arranged on the opposite side of the feed box relative to the wire cylinder, is, at least along the sheet forming zone, arranged to run carried b

Abstract: The plates which define the throat of the head box are movable simultaneously to adjust the size of the exit throat while the angle between the plates is maintained. The adjusting means includes adjusting rods which are slidable lengthwise of the head box and transverse linkages which are pivotally secured to slidable locating members affixed to the plates. Adjusting screws at the throat provide a fine adjustment.

Abstract: Apparatus for forming one or more sheets from a dilute suspension of fibers in a liquid has a Fourdrinier wire the upper reach of which travels above a foraminous support, and a head box which has an outlet discharging the suspension onto the upstream portion of the upper reach. The liquid passes through the wire and support, and the fibers form a mat which is carried and advanced by the upper reach of the wire. The apparatus has several deckles which are impervious to liquid and are mounted in or on the support or at a level immediately above the upper reach of the wire. Each deckle extends lengthwise of the entire outlet of the head box and its width is only a small fraction of the width of the outlet. Feed screws or the like are used for moving the deckles sideways so that they overlie selected elongated zones of the upstream portion of the upper reach of the wire, and each deckle can be releasably fixed in the selected position.

Abstract: A secondary headbox is described which is capable of handling water slurries of relatively high solids consistencies and applying the slurries to a base sheet as it is being formed on conventional fourdrinier equipment in the manufacture of a board product. The secondary headbox includes means whereby the slurry is mixed and evenly distributed across its width and means whereby the thus treated slurry is further treated to remove any turbulence and to controllably feed the slurry onto the base sheet on a fourdrinier wire passing beneath the secondary headbox.

Abstract: A paper machine headbox in which the ideal distance or eddy decay length may be varied to provide improved formation and tensile ratio for different grades and types of paper. The slice for the headbox is defined by a pivotally mounted nozzle blade and an apron blade, and one of the blades is mounted for sliding movement toward and away from the other. With this construction, the effective flow area through the flow channel to the slice may be varied, thereby varying the velocity of the paper making stock delivered to the slice and the ideal distance or eddy decay length.