Abstract: A nozzle-like, machine-wide stock channel forms a stock discharge opening to which is allocated a device for adjusting the basis weight cross direction (CD) profile of the paper web produced in the paper machine. The device has a profile bar extending across the machine width. This is connected to an expanding member supported at the headbox in which are arranged pressure chambers disposed in succession across the machine width. By pressurization of the chambers of the expanding member consisting of an elastic material, this can be deformed. The deformation is transferred to the profile bar and in this way the effective width of the stock discharge opening changed.

Abstract: Expanding body which is essentially designed as a hollow beam and, viewed in the cross-section, composed of several flexible walls. At least one of these walls has a higher expandability than the other walls. The internal chamber of the expanding body can be pressurized by a variable fluid pressure. On the use of such an expanding body in a paper machine headbox a wall with a relatively low expandability forms the downstream end piece of a flow guide wall. Its position, which determines the clear width of the discharge opening, is alterable by varying the internal pressure.

Abstract: A headbox for dispensing a machine-width suspension flow from a machine-width nozzle type discharge channel which is defined by two machine-width flow control walls converging on each other. Located on the downstream end is a machine-width discharge gap for the flow of suspension. One of the two flow control walls is for fine adjustment of the discharge gap width and is equipped with an elastically flexible wall section which extends across the machine width. This wall section is equipped with a number of areal heating elements in a succession across the machine width, with which material layers having different coefficients of heat expansion may be coordinated. By appropriate heating of individual heating elements it is possible to achieve a local deformation of the flexible wall section and thus a local change of the discharge gap width and a correction of the basis weight cross profile of the paper web produced.

Abstract: Method and apparatus for compensating bending of a lip beam in a paper machine when papermaking pulp flowing through the slice formed with the lip beam causes loading upon a bottom surface of the top lip beam. The bending of the beam caused by the loading is compensated by bending the lip beam in the opposite direction, by creating a temperature difference in the lip beam between a top part and a bottom part of the same.

Abstract: In a multi-ply headbox, the nozzle chamber is subdivided by rigid partition walls into a number of nozzle chambers, and the slice openings or outlet slices are adjustable independently of one another. This is accomplished by providing a pivotable mounting of the partition wall or walls in a guide block, for instance, such pivotable mounting being accomplished by a substantially cylindrical shell or cup bearing structure. The desired pivotable movement or adjustment of the rigid partition wall can be undertaken by an inclined groove-cam guide arrangement effective at a projection of the partition wall or by pressure cushions, such as pressure hoses effective at both sides of the projection.

Abstract: A headbox, preferably for a paper machine, has a nozzle chamber with a slice gap, which is confined by a top and a bottom lip wall and by two side walls. The nozzle chamber is divided for the production of multi-layer fibrous stock webs into two or more machine-wide flow channels. For this purpose at least one wedge-shaped partition wall extends through the nozzle chamber from one side wall to the other, with this partition wall projecting through the slice gap in the direction of flow. Each of the two side walls is subdivided along the partition wall into two side wall sections. The partition wall is clamped between the side wall sections in the area of each side wall.

Abstract: A plurality of stages of parallel twisted plates extend in a slurry passage adjacent to a slice outlet of a head box in the direction of papermaking slurry flow therethrough and are spaced apart from each other by a predetermined distance. The twisted plates directly cause the slurry flowing through the head box to swirl. Adjacent vortex flows of the slurry interfere with each other, resulting in the violent agitation of the slurry.

Abstract: Fastening of a profile bar to adjustment spindles at a discharge opening of a head box of a paper machine. A series of fastening holes or recesses are made into one edge of the profile bar and provided with chamferings. In the end of the adjustment spindles situated next to the discharge opening, a recess is provided with a series of screws being fitted in one side thereof. These screws are provided with ends coresponding to the chamferings in the fastening holes of the profile bar. A second set of screws coaxial with the first set of screws are provided in an outer wall of the recess, with inner ends of the second set of screws being provided with parts corresponding to the outer chamferings of the fastening holes in the profile bar.

Abstract: A head box has a preferably fixed flow-carrying wall (11) and a movable flow-carrying wall (13) defining a nozzle-like stock conduit (14) and an outlet slot (15). The movable wall is provided with an adjustable profile bar (35) at the stock outlet slot. For coarse adjustment of the slot width, two lifting devices (21) act on the movable flow-carrying wall. Fine adjustment of the slot width is performed by adjustment spindles (36) acting on the profile bar.To improve adjustment of the stock outlet slot by the movable wall and to use the profile bar adjustment to perform very small corrections to the slot width, a front end section (24) of the movable wall located in the region of the stock outlet slot is flexibly constructed with respect to the remaining part of the wall, and a plurality of adjustment units (33) are spaced across the machine width and act on the flexible end section directly in front of the stock outlet slot.

Abstract: A head box in a paper machine, characterized in that a flow path having a repeatedly and alternately narrowing and broadening cross-section configuration is formed within a slice chamber delimited by a top plate and a bottom plate converging towards a slip lip.

Abstract: A profile bar for a discharge opening of a head box of a paper machine, by means of which the profile of the discharge jet from the paper machine is controlled. The profile bar may be connected to adjustment spindles, by means of which the profile bar can be bent in a plane transverse to a direction of flow of the discharge jet. Bending stiffness of the profile bar in the direction of bending to be achieved by means of the adjustment spindles, is arranged to be substantially lower within areas facing the adjustment spindles than at a middle of an area between the adjustment spindles. Transverse sawings or recesses may be made into the profile bar with a spacing substantially denser than the spacing between the adjustment spindles or equivalent. Alternatively, the profile bar may be provided with projections to which the adjustment spindles are attached, with the height of the projections being greater than a maximum height of the profile bar in the space between the projections.

Abstract: An apparatus is disclosed for selectively moving the slice lip of a headbox of a papermaking machine. The apparatus includes a housing secured to the headbox with the housing defining an elongate chamber. A control rod has a first and a second end with the first end being connected to the slice lip and the second end defining a longitudinally-threaded surface. A rotatable member is disposed within the chamber, the rotatable member defining an internally-threaded bore which cooperates with the threaded surface of the control rod such that when the member rotates within the chamber, the control rod is moved axially relative to the housing for selectively moving the slice lip. A motor is rigidly secured to the housing and is drivingly connected to the rotatable member for selectively rotating the rotatable member relative to the housing.

Abstract: The device comprises a head box with a nozzle for applying a pulp suspension on a wire located below the nozzle. A pressure plate is located after the nozzle over the pulp suspension. The pressure plate comprises a concave formed portion, against which the pulp suspension is sprayed, and a subsequent convex formed portion. The fiber web is formed in a forming zone where dewatering is effected in that the convex portion of the pressure plate and an unsupported portion of the wire are pressed against each other.

Abstract: A method and a device for forming a web in a papermaking machine. The stock (2) is sprayed out on the wire (3) through a nozzle (1) and the web is formed in a space (8) between an upper lip (5, 18, 19) and a portion of the wire (3). The dewatering is effected in this space (8) by means of an overpressure between the upper lip (5, 18, 19) and the wire (3).

Abstract: At the slice region of a headbox of a papermaking machine, an upper lip is extended across the machine width above the area where the stock suspension is charged onto the forming wire. To the lip is secured a profiling member with a portion thereof being extendable into the throat of the stock passage. The member has spaced upstanding arms. Inwardly-facing coaxially-aligned bolting extends through each arm and the pair thereof support a rectangular open frame. A load is disposed within the frame so as to be spaced from any side thereof, being supported on each side by the bolting. A self-contained force couple may be generated against the load in the form of equal forces in opposite directions.

Abstract: A breast box nozzle for a paper making machine or the like is shown as having an adjustably positionable shutter member which can be moved generally further and lesser into the path of flow of a stream of pulp stock as to thereby determine the thickness of the discharge stream of pulp stock; a support arrangement applies a pressure to the shutter member as against a downstream side thereof in order to counter the forces generated by the stream of pulp stock upstream of the shutter member and applied as against the upstream side thereof tending to undesirably deform the shutter member; the support arrangement has an elastomeric member, which can be internally pressurized, generally interposed between a relatively fixed support member and a downstream side of the shutter member; and an elongated slide member is generally interposed between the elastomeric member and the downstream side of the shutter member.

Abstract: A headbox for delivering stock to a forming surface in a papermaking machine with the headbox having a slice chamber and a slice opening and having trailing elements positioned in the slice chamber extending transversely of the headbox with means anchoring the elements only at their upstream ends with the downstream portion unattached and constructed to be self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing toward the slice with the elements having greater structural stiffness in the cross-machine direction so that the elements offer resistance to deflection in a cross-machine direction by transient pressure variations and offer minimal resistance to deformation of the fluid flow stream for balancing forces on opposite sides of the elements with the elements in one form being laminated with a plurality of anisotropic layers.

Abstract: A headbox for a paper machine comprising a top plate and a bottom plate defining a chamber therebetween and a plurality of flow restraining elements disposed one above another in the chamber to define a plurality of paths spaced one above another therein. The top and bottom plates are connected to one end to a perforated plate defining an inlet for the chamber and approach each other as they approach an outlet for the chamber. Each element is removably connected at one end to the perforated plate, and the paths extend from the inlet to the outlet. Each element has a mildly corrugated upper surface and a mildly corrugated lower surface which approach each other until they terminate in a free end remote from the perforated plate. Those surfaces are substantially symmetrical to each other with respect to a center line of said element. Each element has a free end portion formed from an easily deformable material, such as rubber or plastics. The surfaces of each element define an angle of 1.degree. to 15.degree.

Abstract: A reversible slice lip for paper machine is formed with two discrete slice edges extending substantially parallel and forming opposite longitudinal edges of the slice lip. The slice lip is provided with a mounting means and is formed substantially symmetrical about its longitudinal axis so that it may be mounted on the headbox with one or the other of the slice edges in operative position.

Abstract: A paper machine trailing element for use in a slice in a headbox wherein the trailing element is formed of laminations with a bead at the upper end for anchoring the element in a slice chamber with the bead formed of laminations with fibers on the outer surface in the machine direction and in the cross-machine direction within the bead so that the element has a greater stiffness in the machine direction at the upstream end with the element tapering to a thin tip at the downstream end and the downstream end formed of laminations with fibers extending in the cross-machine direction for a greater stiffness to minimize instability.

Abstract: A method and apparatus for forming a paper web from a fiber suspension are disclosed. These include injecting a fiber suspension stream through a slice opening onto the upper surface of a travelling paper web-forming surface, maintaining that surface free of support for a predetermined distance downstream of the slice opening, maintaining a flexible lip near the upper surface of the web-forming surface for a portion of that predetermined distance, and applying a vacuum to the lower surface of the web-forming surface throughout the predetermined distance. In this manner, both the method and apparatus can produce a paper web and substantially dewater the fiber suspension within the space between the flexible lip and the web-forming suspension and substantially reduce disturbances during formation of the web and throughout the predetermined distance.

Abstract: Apparatus is known for controlling the deposition of a liquid onto a moving surface comprising a reservoir having an outlet, and a curved guide member downwardly extending from above and adjacent to the outlet and having an underside onto which a jet of liquid can be discharged from the outlet, the guide member being oriented so as to be capable of causing liquid to flow down the member on its underside so that its direction of flow approaches the direction of travel of a moving surface.

Abstract: The outer walls of the beams of a papermachine headbox are heated by means of heat transferred from the stock to a temperature equal to that of the inner walls in contact with the stock. This is preferably carried out so that the liquid which is circulated in a closed liquid circulation through liquid spaces adjoining the outer walls, is caused to be in indirect heat transfer contact with the stock.

Abstract: The multi-ply headbox has a number of, for example, three headbox elements comprising block-like infeed members containing mutually parallel distributor passages for the fiber stock suspension which open each into a nozzle chamber. Plate-like intermediate lip members or lips bound the nozzle chambers and are provided between the headbox elements. The plate-like intermediate lips are displaceably arranged between the infeed members. There are also provided outer lips or lip members which either can be structured as displaceable plates or may be constructed to be pivotable. One of the outlet slices can be altered without affecting the size of the other slices.

Abstract: The invention relates to a method and an apparatus for detecting and counteracting a deformation of the stock discharge gap in a paper machine headbox, which is caused by thermal expansion due to the temperature of the stock and/or the pressure of the stock. This is achieved by ultrasonic transducers located close to the slice opening which obtain measurement results relating to the distance between the roof member and the apron beam member of the headbox. At least two such transducers, one preferably located close to a side wall of the discharge gap and the other preferably located midway between the side walls, give information about a possible difference between the measurement results caused by the deformation. This difference serves as a guide for adjusting the temperature of the apron beam member and/or the roof member in such a way that the deformation is reduced in magnitude or entirely eliminated.

Abstract: A coupling to attach the lip of a head box on a paper making machine to the head box, the coupling comprises a body to be attached to an adjuster extending from an actuator. The body is attached to the head box to permit movement of the body relative to the head box, under the influence of the actuator. The body has a recess adapted to receive the lip. There is a second recess, generally perpendicular to the lip-receiving recess.The lip received in the first recess is pivotally clamped against the head box.

Abstract: A device for use in conjunction with a slice lip adjusting mechanism for controlling the distribution of stock across the web of a paper machine to obtain a desired cross-machine profile of basis weight, moisture, caliper and the like. The device is used in conjunction with a slice body and a slice lip which abuts the body but is at least slightly movable relative thereto. An apertured adjusting arm engages the slice lip for fine adjustment of the lip position. Disengagement between the adjusting arm and the slice lip is prevented by a headed bolt which passes through the aperture in the adjusting arm and is received in threaded engagement in the slice body, in combination with a plug which is received in threaded engagement at the head of the bolt and a compressed spring which acts between the plug and the adjusting arm.

Abstract: A headbox for a paper-making machine having a flow rectifier which comprises a first flow control member disposed in a flow path and a second flow control member disposed in a downstream side of the first flow control member. Being in contact with the first flow control member, the second flow control member is so constituted that the flow stagnation phenomena generated by the first flow control member is eliminated by the second flow control member. In other words, a uniform flow rate distribution or speed is achieved across the outlet of the second flow control member by rapidly decelerating the flow therein.

Abstract: A stock delivery system is provided having a rectangular sectioned distributor of substantially square section connected in stock supplying relation to a headbox having an apertured distributor place, a mixing chamber receiving stock therein connecting by way of a throttle plate to a multi-tier diffuser section comprising cylindrical tubes that diverge to a square section. A parallel flow section of predetermined length connects to a tapered nozzle section. The structural elements of the apparatus, including the support beam, a portion of the diffuser section, and the roof section are connected in liquid transfer relation to permit the passage of liquid a controlled temperature therethrough. Also, the slice is provided with liquid containment capability, and also includes a segmented extension chamber to permit substantially unrestricted later expansion or contraction of the slice under changing thermal conditions.

Abstract: Multilayer headbox apparatus for a papermaking machine comprises spaced apart headbox walls defining an elongated, converging channel terminating in an exit opening, and at least one partition member anchored in the headbox at its upstream end with its downstream end free, said partition member extending from side to side in the headbox and at least to the vicinity of said opening and dividing the headbox into a plurality of shallow, converging channels extending to said opening for conveying a plurality of paper making stocks thereto and for discharging a plurality of paper making stocks therefrom in stacked, spaced apart relation, together with means for maintaining a wedge-shaped body of gaseous fluid between said discharged jets at the downstream end of said partition member to keep the jets separated for a predetermined distance beyond said exit opening in the direction of a forming surface.

Abstract: A headbox contains a nozzle channel which, in the direction of flow of the stock suspension or pulp. converges towards an outlet gap or slice. The nozzle channel contains two lips. At least one of these lips has a wall portion or section which is concave with respect to the stock suspension. This wall section is defined by imaginary curved reference lines. This wall section or portion is formed by steps or step portions extending essentially parallel to the outlet gap. Each of the step portions comprises a substantially planar partial surface extending comparable to the direction of flow of the stock suspension and an end surface disposed transversely with respect to its related planar or flat partial surface. At the region of this particularly simple to fabricate wall section there is thus produced microturbulence directly prior to the sheet formation.

Abstract: A jet of liquid (3) is deposited from a reservoir outlet (2) on to a moving surface (4) located below the outlet. Deposition is effected by discharging a jet of the liquid on to the underside of a curved guide member (5) which is disposed between the outlet and the moving surface and which is oriented so as to cause the liquid to flow down the member on its underside so that its direction of flow approaches the direction of travel of the moving surface.The invention is particularly advantageous in the production of paper webs, especially multi-layer paper webs on a Fourdrinier paper-making machine.

Abstract: The disclosure concerns the wire end section of a paper making machine. The wire belt is an endless loop and the pulp suspension is supplied by one or more head boxes. The head box has an upstream and a downstream flow guide wall defining a pulp outlet opening between them. The downstream guide wall has a convexly curved slide shoe which cooperates with the passing wire belt to define a web-forming zone. At the other side of the wire belt, upstream of the outlet opening, another convexly curved wire support surface is defined for leading the wire belt into the web-forming zone. Both of the convexly curved surfaces are displaceable transversely to the direction of pulp flow from the head box. The radius of curvature of the slide shoe is greater at the outlet opening and smaller away from the outlet opening. The radius of curvature of the cooperating supporting surface on the other side of the belt is smaller than the mean radius of curvature of the slide shoe.

Abstract: Apparatus for a paper making machine to form multi-ply web including a headbox having an upper and lower chamber for low consistency fibrous stock to form the outer surface plies of a finished web and an intermediate chamber for receiving a high consistency stock for an intermediate ply with the headbox chambers delivering to portions of a slice chamber, with the outer portions of the slice chamber discharging through a slice opening onto a travelling forming surface and such slice chamber portions having flexible fine scale turbulence trailing elements unsupported at their downstream ends, and the slice chamber having an intermediate passageway receiving stock from the intermediate chamber of the headbox and being defined between solid walls which have inwardly facing surfaces forming a high efficiency tortuous undulating path for the high consistency stock flowing therethrough.

Abstract: An improved slice lip applicable to a head box for a paper-making machine. The improvement includes a main body and the joint portion on the liquid-contacting side of the lip being fitted on the same plane, a neck portion having low bending rigidity in the orthogonal direction of the flow formed between the fitting portion of the lip to the main body and the tip portion of the lip in the direction of the width, and a plurality of adjusting rods connected to the tip portion of the lip which are so disposed as to be capable of adjusting a tip gap between the tip portion of the lip and its main lip in the direction of the width whereby a sheet-like jet can be obtained.

Abstract: A headbox contains a rigid lower lip which is directed towards a dewatering surface, a wire or the like, guided over a rotating cylinder or roll, and a rigid upper lip having a rigid lip portion which, in conjunction with a portion or section of the dewatering surface neighboring the lower lip downstream with respect to the flow of the stock suspension, delimits a sheet forming chamber or space. The lip portion is provided at the region of the sheet forming chamber with step or groove-like depressions or recesses extending transversely with respect to the direction of flow of the stock or fiber suspension. These recesses serve to form recirculation turbulence which supports the marginal flow of the stock suspension.

Abstract: Process and apparatus for controlling the deposition of a liquid on to a moving surface.A jet of liquid (3) is deposited from a reservoir outlet (2) on to a moving surface (4) located below the outlet. Deposition is effected by discharging a jet of the liquid on to the underside of a curved guide member (5) which is disposed between the outlet and the moving surface and which is oriented so as to cause the liquid to flow down the member on its underside so that its direction of flow approaches the direction of travel of the moving surface.The invention is particularly advantageous in the production of paper webs, especially multi-layer paper webs on a Fourdrinier paper-making machine.

Abstract: A breast box nozzle for a paper making machine or the like is shown as having an adjustably positionable shutter member which can be moved generally further and lesser into the path of flow of a stream of pulp stock as to thereby determine the thickness of the discharged stream of pulp stock. A support arrangement applies a pressure to the shutter member as against a downstream side thereof in order to counter the forces generated by the stream of pulp stock upstream of the shutter member and applied as against the upstream side thereof tending to undesirably deform the shutter member. The support arrangement includes an elastomeric member generally interposed between a relatively fixed support member and a downstream side of the shutter member.

Abstract: At least a substantial proportion of the fibers in papermaking stock are delivered in cross direction orientation to the slice chamber of a headbox and remain in the cross direction orientation for delivery from the slice chamber to a forming surface. The cross direction orientation is effected by a set of partitions defining stock flow passages extending obliquely in the cross direction, receiving the stock flowing in the machine direction and biasing the streams of the stock to flow in generally the cross direction to the downstream ends of the passages from which the streams are diverted in substantially the machine direction towards the slice chamber. The stock with fibers oriented in the cross direction may be supplied to turbulence controlling channels in the slice chamber.

Abstract: A pulp feed for a papermaking machine, comprising a substantially slot-like guide channel having at least two step-like widened portions. Before and after each widened portion there is provided a linear channel section, and between the widened portions there is arranged a tapered section or portion. The slot widths before both of the widened portions can be of the same magnitude and conjointly adjustable by means of a translationally movable element. The slot-like guide channel has arranged forwardly thereof a perforated plate and a mixing chamber merging thereat. Also a pulp feed channel having an adjustable lip and merging at the guide channel can possess step-shaped widened portions.

Abstract: A headbox for paper and pulp machines is pivotally mounted at the ends of a plurality of control links secured to the machine frame and pointing from the machine frame towards a center of rotation in the vicinity of the headbox slice opening. The angular relation and the vertical position of the headbox with respect to a web forming zone are accurately set by controlling the rotation and translation of the respective control links and the headbox thereafter is maintained rigidly fixed in the set position.

Abstract: A pulp feed for a papermaking machine comprising a guide block having guide channels through which parallelly flows the pulp or stock suspension and a nozzle channel which merges with the guide block. The nozzle channel terminates at an outlet gap for the efflux of the pulp and is bounded by two lip plates. In order to adjust the size of the gap in a direction towards and away therefrom, while maintaining a constant angle of the lip plates relative to one another and in relation to the guide block, these lip plates are displaceable. There is fixedly secured at the guide block at least one rigid partition or divider wall which, in the flow direction of the pulp, divides the nozzle channel along its entire length into partial cross-sectional regions, wherein the relationship of the cross-sections of such cross-sectional regions, in a direction perpendicular to the flow direction of the pulp or stock suspension is essentially constant.

Abstract: A paper machine has a headbox provided with a slice through which a pulp suspension discharges from the headbox, this slice being defined in part by an upper lip frame. The pulp suspension flows to the slice from a distribution header and a turbulence passage assembly which receives the pulp stock from the distribution header and continues the flow thereof toward the slice. An air tank is provided for containing air under pressure to act on the flowing pulp stock so as to damp pressure fluctuations in the pulp suspension flow, and this air tank is connected in part to the upper lip frame of the slice so that the pressure in the air tank will act on the pulp suspension in the immediate vicinity of the slice.

Abstract: The head box is provided with a distributor having a plurality of pulp distributing ducts which have terminal sections converging towards the throat of the box. The distributing ducts also have step-like widenings upstream of the terminal sections to create a strong turbulence in the pulp flow to maintain the solids content of the pulp in suspension. The terminal sections terminate short of the throat so as to reduce any risk of cross-flow and thus improve the flow of the pulp.

Abstract: Turbulence is generated within a headbox nozzle passage in such close adjacency to the slice opening as to assure thorough and substantially uniform dispersion of the fibers in a jet stream delivered to the forming area on a travelling paper web forming surface. Substantial suppression of turbulence in the jet stream is effected without interferring with the substantial uniformity of fiber dispersion in the suspension as delivered to the forming surface.

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: The distribution pipe is of narrowing circular cross-section with an elongated aperture. The pulp guide is mounted via a tongue and groove connection on the pipe to both sides of the aperture in order to hold the pipe together against the peripherally operative tangential force of the pipe. The plates which form the throat can be replaced from time-to-time to change the size of the throat.

Abstract: For a paper, board or similar fibrous web making machine, a flowbox comprising an enclosed explosion chamber having upstream and downstream walls converging from a top wall toward a bottom wall, the stock inlet being directed at the downstream wall adjacent the region of convergence. A stock outlet is provided by non-divergent upper and lower plates defining an exit slice, the lower plate being a continuation of the bottom wall and the lower plate being shorter than the upper plate.

Abstract: A method and device for manufacturing a continuous material of elongated fibrous particles from a suspension of the fibrous articles with a concentration at least twice as high as the sediment concentration of the fibrous particles, in which the highly concentrated suspension is distributed and deflected in a chamber before the suspension is passed to a decay channel from which the suspension is deposited, is disclosed wherein the suspension is exposed in an intermediate forming channel between the chamber and the outlet channel to a plurality of changes of direction to change the direction which in turn contributes to the local variations of the fibre concentration in the suspension becoming more even.

Abstract: Stock distribution means for delivering an aqueous slurry in a papermaking machine has a tapering passage which delivers stock to a nozzle by way of several rows of channels whose inlets are in communication with the passage. The passage, the entire channels and/or the inlets of the channels are configurated and dimensioned in such a way that the resistance which the inlets nearer to the intake end of the passage offer to the inflow of stock is more pronounced than the resistance of inlets which are more distant from such intake end. This insures uniformity or substantial uniformity of the volume of stock flow in each channel in spite of the fact that the channels of neighboring rows are at least partially inclined with respect to each other and that the inlets of channels in successive rows are located downstream of each other, as considered in the direction of stock flow in the passage.