Abstract: The papermaking machine contains at least one water pervious dewatering wire or the like for forming a fiber web, particularly one layer of a multi-ply fiber web, and at least one headbox for infeeding a fiber stock suspension to be applied in the form of a free jet to the dewatering wire. Between the headbox and a section of the dewatering wire extending along the headbox there is arranged at least one deflecting device for separating and withdrawing a partial flow or stream of the fiber stock suspension. The deflecting device can be inserted into a marginal region of the free stock jet. Such an arrangement enables, for example, a continuous or infinitely variable adjustment of the format width of the fiber web to be produced.

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 method and apparatus for feeding a fibre suspension onto the wire of a web former through a guiding device consisting of a plurality of guiding channels through which the fibre suspension flows parallelly and which are connected to a slice chamber leading to a slice and extending across the wire of the web former. A means for separating the dilute outer part of the jet of stock flowing in from every single flow channel is disposed downstream of the guiding device. The outer portion is deflected from the direction of flow of the thicker and more homogeneous core part and the latter is allowed to proceed up to the lip substantially maintaining its direction. Thus, a situation is reached, whereby considerably less local consistency variations occur in the lip flow across the head box. Preferably, this means is formed by a plate in which there are openings disposed coaxially with regard to the manifold tubes so that the diameter of the openings of the plate is smaller than that of the openings of the tubes.

Abstract: A system for damping the pressure fluctuations in a paper machine headbox. The headbox applying the damping system comprises an equalizing chamber communicating with an air space, this equalizing chamber having an outlet/outlets for a channel/channels leading to the equalizing chamber as well as an inlet/inlets for a channel/channels leaving the equalizing chamber. The outlet chamber is disposed with regard to the inlet channel so, and the cross surfaces of the outlet and inlet channels have been dimensioned so that the jet of stock flowing out of the outlet and expanding divergently falls substantially inside the boundaries of the inlet.

Abstract: The present invention relates to a headbox assembly wherein a headbox is subjected to extraneous vibrational energy from adjoining machinery or the like and provides at least one vibration absorber rigidly secured to the headbox in the plane of vibration of the extraneous vibration, the vibration absorber creating a node at the headbox to absorb vibrational energy transmitted thereto.

Abstract: A headbox of a paper machine has a stock distribution header part, a distribution pipe assembly connected to the stock distribution header part, an equalizing passage following the distribution pipe assembly in the flow path of the stock suspension, an air tank in immediate communication with the equalizing passage and a converging slice part following the equalizing passage, the converging slice part having a lower lip wall and an adjustable upper lip wall. A turbulence section between the equalizing passage and the converging slice part has at least one exchangeable grating cassette consisting of at least two grating plates in abutment with each other. A first of the grating plates and in the direction of the stock flow and has a plurality of apertures formed therethrough.

Abstract: A paper machine has an equalizing part between a distribution pipe system part and a turbulence section in the flow path of the pulp stock. The equalizing part has an equalizing chamber with a length in the direction of flow of the pulp stock and a front wall. An adjusting device is coupled to the front wall of the equalizing chamber for adjusting the length of the equalizing chamber by adjustment of the position of the front wall.

Abstract: A manifold-like chamber is shown having a plurality of distribution conduits in communication therewith for evenly and uniformly distributing fluid pulp stock for subsequent paper forming operations; alternate ones of such conduits communicate with the chamber as at a relatively low elevation thereof while intermediate alternate ones of such conduits communicate with the chamber at a relatively higher elevation; the distribution conduits are formed as with two straight sections joined by an intermediate single curved or bent portion to further enhance turbulence therein; the distribution conduits are further situated as have the discharge therefrom generally parallel, at least as viewed from above; edge-forming means is provided within the chamber as to thereby obtain desired flow patterns within the fluid pulp in the chamber.

Abstract: An installation for charging a multi-ply headbox, wherein the mixing pumps of the stock infeed systems for the stock which is diluted with water, i.e. the stock slurries, are driven by a single drive motor by means of a common shaft. Additionally, a pressure differential-regulation device is provided for the fine tuning or coordination of the pressures of the stock suspensions in the headbox. Signals are inputted by means of pressure feelers or sensors to the pressure differential-regulation device. As a function of the deviations from a set or reference value there are activated regulation valves which are arranged in bypass lines shunting the mixing pumps. The bypass lines or conduits flow communicate with sieve water containers connected with the suction side of the mixing pumps. Through these measures there is avoided mechanical damage to the headbox, particularly to the partition walls arranged internally thereof.

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: The disclosure concerns the chamber of a head box for a paper making machine. Movable partition walls extend between the side walls of the chamber. Opposed stub shafts in the opposite side walls of the chamber carry eccentric journal pins which are received in respective partition walls, such that rotation of each stub shaft adjusts the position of the respective engaged partition wall. A second concentric pin on each stub shaft also engages the respective partition wall, whereby the eccentric pin may move the partition wall while the concentric pin may guide the movement. Appropriate longitudinally extending grooves are defined in the partition wall to absorb the motion caused by rotation of the stub shaft, which moves the partition wall with respect to the stub shaft. As appropriate, there may be respective generally mutually perpendicular longitudinally extending grooves for the concentric and eccentric pins, respectively.

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: A paper machine screening apparatus generally includes a centrifugal pump member mounted for rotation about the axis of a tubular screen plate. A delivery passageway extends concentrically about the pump impeller for receiving pumped stock flow and includes an annular axially extending passage formed between a ribbed hub surface of the pump and the screen. Flow through the screen is passed from the screening apparatus to headboxes. Downstream of the annular passage is an end cavity for receiving particles unable to pass through the screen holes which are washed into the end cavity by the axial flow through the annular passage. The ribbings on the hub surface serve to agitate the stock flow to raise pressure forces tending to force flow out through the screen holes.

Abstract: The apparatus for manufacturing the fiberboard is in the form of two vertically opposed endless conveyors upon each of which a fiber layer is formed. Each conveyor has a slanted running portion as a part thereof. A suction box is disposed along the inner surface of each of the slanted running portions so that a fiber layer producing section is formed in each slanted portion. A passage is formed between the conveyors to direct a slurry flow of fibers along each conveyor. The relative speeds of the slurry flow through the passage along the surface of the conveyors is adjusted to be different than the running speed of the conveyors; a supply duct for the slurry flow is disposed in the center of said passage and has an outlet near the upper ends of the fiber layer forming sections. The two layers simultaneously formed can be placed upon each other to form a single layer of fiberboard.

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: An insert type attenuator arranged to function as a broad-band frequency rejection filter for pulsations in a liquid in a conduit, such as a liquid stock suspension being fed via a pipe line to a paper making headbox, which includes a housing, a conduit positioned within the housing, and a flexible diaphragm having a pair of substantially horizontal spaced runs positioned in the conduit, with means for flowing the stock suspension through the conduit, and means for introducing pressurized gas into and bleeding gas from the housing and the space between the diaphragm runs. Valve means operate intermittently in response to gross outward deflection of one or both of the runs, caused by long-term liquid pressure decreases and/or gradual increases of gas pressure build-up, to vent gas from between the runs and from the housing, and thus to maintain adequate matching of the pressures of the gas cushion and of the liquid.

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: Paper pulp insulation of uniform weight per unit length is formed simultaneously on each of a plurality of advancing electrical conductors (21--21) by the use of a dual zone headbox (23) which cooperates with a forming cylinder (24). In one zone of the headbox, the average velocity of a pulpous mixture flowing in a channel (54) is controlled by a first velocity control member (58) after which the pulpous mixture is split into a plurality of streams to form a pulp ribbon (29) below each of the conductors on the periphery of the forming cylinder. In the other zone, the pulpous mixture is passed through a channel (57) prior to being split into individual streams that are deposited as ribbons (31--31) above the conductors. The average velocity of the pulpous mixture in the channel (57) in the other zone is controlled by a second velocity control member (66) having a plurality of discrete individually adjustable sections which are aligned with the streams.

Abstract: Quick connect apparatus for headbox components in a paper making machine, e.g., apparatus to quickly connect and disconnect the equalizing chamber portion of the air cushion damper from associated distribution header and turbulence sections of the machine, include an elongate locking rod extending over a substantial portion of the end region of the components to be attached, the locking rod being mounted for longitudinal movement. The locking rod is provided with spaced locking portions adapted to lockingly engage correspondingly spaced portions of adjacent components to which said component is to be attached. The components are quickly connected in one embodiment by the longitudinal movement of the elongate locking rod or, in another embodiment, by the rotational movement thereof, whereby the locking portions on the rod are moved into and out of locking engagement with the corresponding spaced locking portions of the other component.

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: The invention is concerned with a method and apparatus for use in the manufacture of paper and board in which pulp in suspension is directed at such an angle and at such a speed towards a screen travelling at a determined speed that the resultant direction of travel of the pulp relative to the screen is substantially at right angles to the screen. In a preferred form of the invention, the pulp suspension is discharged onto the screen as a curtain which extends across a substantial portion of the width of the screen. The invention also provides a chamber into which the pulp is discharged onto the screen, the chamber being sealed at inlet and outlet ends by rollers. The invention further provides for a pulp web formed on the screen to be transferred from the screen onto the roller at the outlet end by means of discharge vents located below the roller and the screen.

Abstract: A headbox for a paper making machine having a slice chamber with a vertical tube bank supplying the slice chamber and a distributor chamber behind the tube chamber tapering from a larger size to one side of the machine to a smaller size at the other side of the machine with the lower floor of the header chamber sloping upwardly and a pivotal cover extending over the tube bank and header chamber openable for access to the tube bank and header chamber.

Abstract: The distribution pipe and pulp guide of the head box are mounted in a box-shaped support which is rotatable within two annular bearings. The support may be rotated so as to move the pulp guide from a horizontal plane into a vertical plane, for example for cleaning purposes. In addition, the distribution pipe is removably secured to the frame so as to be moved out of the support for cleaning purposes.

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: The fiber orientation of fourdrinier laid machine made paper is simulated with a bench top handsheet mold by means of a two-axis flow convergent nozzle asymmetrically positioned in the slurry reservoir box of the mold. When a pulp slurry is drained of water, a strong flow stream vector component parallel with the forming wire plane is generated within the flow stream as the slurry flows inductively over the nozzle surfaces and from the nozzle throat.

Abstract: A head box for use with a cylinder type papermaking machine which includes a dispersion chamber having a fiber stock discharge outlet disposed adjacent the surface of the cylinder mold. A lid element extends downstream from the stock outlet in spaced relation to the cylinder mold and has a trailing edge portion capable of flexing to maintain a desired pressure within a pressurized stock formation area established between the lid element and the mold surface notwithstanding pressure changes within the dispersion chamber. Means are provided to selectively vary the spatial relationship of the lid element relative to the surface of the cylinder mold.

Abstract: Wet pressed fiber board material of high resistance to bending is produced by preparing a layer of fiber from a water suspension of the fiber, said layer being de-watered and pressed to form a coherent flat sheet, wherein raw material is distributed over the surface of said layer in varying quantities and/or qualities in a manner such that the pressed board obtains strip-like surface portions which extend in at least one direction of the horizontal plane of the sheet, said strip-like surface portions having varying density and/or strength properties, whereby the finished board has a higher resistance to bending than a homogeneous sheet having substantially the same average density.

Abstract: A web-forming method and apparatus particularly suited for cellulose pulp. The web is initially formed on a rotary wire cylinder which has a horizontal axis and a crest situated at the highest part of the cylinder over the horizontal axis, the cylinder during rotation thus having an upwardly travelling side which turns upwardly toward the crest and a downwardly travelling side which turns downwardly from the crest. At the upwardly travelling side of the cylinder is a headbox having its slice situated adjacent the crest for projecting onto the rotating cylinder a pulp slurry jet at a speed greater than the peripheral speed of the cylinder, so that the deposited pulp slurry will start to form a web while turning with the cylinder up to and then downwardly from the crest thereof. An outer wire has a portion wrapped partially around the cylinder, through an angle of at least 180.degree.

Abstract: An apparatus, such as the headbox of a paper machine, having the capability of compensating for the tendency of a beam to become deflected due to loads, temperature-differential phenomena and the like. A beam is supported at a pair of locations situated inwardly of the ends of the beam but spaced from the center thereof in such a way that due to loads, temperature-differentials, and the like the beam has a tendency to become deflected from a straight condition to a curved condition extending along a curve which passes through the above locations to the ends of the beam. A force structure cooperates with the beam at the region of the ends thereof for opposing the tendency of the beam to assume the above deflected condition so that through this force structure it becomes possible to prevent undesirable beam deflection.

Abstract: A device for carrying out liquid treatment of a fiber pulp suspension to form a running fiber web includes an arc-shaped duct having various portions. The first portion has a converging cross-section for compressing the fiber pulp suspension to form the fiber web. The second portion has a diverging cross-section for the expansion of the fiber web and includes a liquid-treatment zone. The third portion has a converging cross-section for compressing the fiber web. Along its length, the duct is defined inwardly by a rotary cylindrical screen member and radially outwardly by a stationary wall member.

Abstract: In a headbox of slender profile having a load bearing structure extending in the cross machine direction located on one side of the headbox rectifier section, load transfer partitions reaching across the depth of the rectifier section connect one wall of the section to the opposite wall in load transfer relation, to transfer pressure loading there-across, so as to maintain the rectifier section in substantially undeformed condition during operation.

Abstract: A combination-paper machine, especially one for the continuous manufacture of thick paper, cardboard or the like, is disclosed as having two perforated cylinders which form a combining space or slit between them, devices for feeding pulp suspension onto the perforated cylinders prior to the combining point, whereby an endless wire is guided along at least that surface of each perforated cylinders which is between the pulp suspension feeding point and the combining point, the pulp suspension feeding devices including two roof-like upper lips which cover at least part of the wire-covered surface of each perforated cylinder prior to the combining point. The roof-like upper lips are mutually separate and independent, the combining space is slightly greater than the thickness of the completed web, and after the combining point both the wires are guided to run over a certain distance along the surface of one and the same perforated cylinder.

Abstract: A headbox of the pressure nozzle type has a slurry distributor providing a plurality of pairs of separated slurry passages arrayed in the cross-machine direction. The passages of each pair open at their input ends to a manifold located at one side of the distributor. Within the distributor each passage turns at a sharp angle and all the passages are aligned in the machine direction at their output ends. A nozzle structure of a turbulence-generating type is shown coupled to the distributor.

Abstract: A feeding device to which a fibrous suspension is supplied by an input manifold includes a passage extending over the entire width of the forming wire to which the suspension is to be fed. The passage may be composed of several sections, any two consecutive sections including with one another an angle which increases in direction from the inlet to the outlet of the passage. The flow-through cross-sectional area of at least one of the sections may decrease in direction of the flow of the suspension, and the inlet cross-sectional area of any downstream section at most equals the outlet cross-sectional area of the preceding section. A microturbulent flow pattern is obtained throughout the passage so that deposition of the fibers on the walls bounding the passage and agglomeration thereof are prevented.

Abstract: A paper-making machine has a stock supply conduit, a slice, and a pre-slice flow distributing system which communicates with the slice and directs a flow of paper-making stock from the supply conduit to the slice. The system includes a manifold extending longitudinally of the slice, being spaced from the same and having an inlet side through which stock flows from the conduit in direction transversely of the elongation of the manifold. A first side wall of the manifold extends from the inlet side in the flow direction and has a first wall portion which is convex transverse to the flow direction so as to be tangentially approached by the flowing stock and which is formed with a plurality of outlet openings each having a center axis.

Abstract: Headbox assembly for a papermaking machine provided with a wire screen through which water from wet paper stock drains, the assembly including a headbox having a discharge nozzle for a jet of the paper stock, at least one forward and one rearward wedge member as viewed in feed direction of the stock jet from the discharge nozzle, the wedge member underlying the headbox and having respective wedge surfaces of different inclination, respective base members pivotally supporting the headbox and supportingly engaged by the wedge members respectively, a threaded spindle whereon the wedge members are mounted in common, the spindle being actuable for adjusting the position of the wedges forward and rearward of the stock feed direction and accordingly of the headbox whereby the discharge nozzle thereof is adjustable relative to the wire screen of the machine, and guide stop means engaging with the headbox as a brace for adjusting forces applied thereto.

Abstract: In a device for feeding fiber suspension to the web-forming part of a paper machine the tendency of the fibers in the suspension to flocculate and form fiber clusters, before being fed onto the web-forming wire, is eliminated by spraying jets of water or steam or both into the head box which is supplied with a fiber suspension of a consistency greater than the desired. The jets cause strong turbulences in the head box and thereby effectively disperse the fiber clusters.

Abstract: Papermaking apparatus in which deaerated papermaking stock is gravity fed from the evacuated chamber of a stock receiver to paper web-forming means through dropleg supply conduit system interconnecting the bottom of this chamber and the exit slot or slice of paper web-forming headbox, the dropleg conduit system having entry communication with the receiver chamber along a substantial part of a major lateral expanse of the bottom portion of the deaerated stock collecting zone thereof, the droplet conduit system preferably having exit communication with the delivery passage of the paper web-forming headbox transversely in the direction of the transverse length of the exit slice. The conduit system is provided such that its flow course between the stock receiver and the web-forming headbox delivery passage has no course deviation laterally of the web-forming means axis.