Abstract: Finely-mixed stock is produced in a headbox by delivering a multiplicity of separate stock streams at a relatively high velocity into passages defined between closely-spaced planar lamellae which extend parallel to the stock flow and oblique to a medial plane that lies axially and transversely of the fine-mixing stage that contains the lamellae. The stock flows at relatively low velocity in finely-mixed condition from the fine-mixing stage to a discharge nozzle, the axis of which lies at a substantial angle to the axis of the fine-mixing stage. The stock distribution and mixing section and the delivery nozzle of the headbox may be divided axially and transversely into two or more separate compartments for discharge of a jet composed of layers of the same or different stocks to form multi-ply webs.

Abstract: A paper machine has an enclosure for containing a gas under pressure. A hydraulic headbox of the paper machine includes a slice as well as a conductor structure for conducting suspension to the slice and a distributor structure for distributing suspension as uniformly as possible to the conductor structure to be conducted thereby to the slice. The gas enclosure and distributor structure respectively have hollow interior portions communicating with each other so as to provide for the suspension in the distributor portion a free surface acted upon by gas under pressure in the enclosure so that this latter gas under pressure will act as a gas cushion for damping pressure variations in the stock suspension.

Abstract: Apparatus for separating a fibrous suspension of raw stock into acceptable stock and waste material in which an inlet at one end of a casing directs raw stock against a conical plate closing one end of a rotor in the housing and into an annular elongated inner chamber formed beween the imperforate peripheral wall of the rotor and a stationary cylindrical screen surrounding the rotor in the housing so that acceptable stock passes through the screen into an outer space from which it can be removed through a suitable outlet and waste material is directed by elongated angularly inclined ribs on the outer surface of the rotor wall into a turbulence chamber in which a radially extending rib on the other end of the rotor acts on the stock and from whence relatively light waste material is removed through a tangentially extending outlet at the top of the casing and relatively heavy material is removed through an outlet at the bottom of the casing and in which diluent water is introduced into the turbulence chamber th

Abstract: A former for cylinder mold, paper making, machines, of the type now known as B.R.D.A., and having a pressure lid, an explosion chamber with a central imperforate baffle, and a manifold feeding stock to the chamber is characterized by the flow box unitarily containing an explosion chamber separated from a tapered manifold by an apertured plate. Stock is directed from the plate apertures in a direction normal to the baffle for improved mixing. The pressure lid includes a forward cantilevered tip end with a predetermined tip clearance, and is unusually elongated to increase drainage effect. The lower plate of the slice is rubber with an inner bulb and it is slidable axially outward for replacement. The curvature and clearances of the lid are changeable during operation and the lid acts as an adjustable gate for controlling pooling under the lid.

Abstract: The discharge pipes of a plurality of stock pumps, each supplying a separate concentrated stock slurry, are connected with a pipe containing comparatively dilute stock, commonly called "white water", discharged under pressure from a single fan pump on a single white water silo to supply separate slurries to separate chambers of a multi-ply web forming machine. The stock pumps have smaller capacities and pressure heads compared with a fan pump, thereby providing increased efficiency at required capacity with the minimum of equipment.

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.

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 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.

Abstract: A structure for keeping clean the interior of the headbox of a paper machine as well as contributing to the homogeneity of the stock flowing through the headbox. At a location in the headbox where there is a tendency for accumulation or build-up of matter such as fibers, fillers, slime, or the like, steam is introduced such as by supplying steam to the interior of a hollow body having a wall provided with passages through which the steam can escape to the exterior of the hollow body into the stock in the headbox.

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: The inlet side of the guiding arrangement in a paper machine is formed with bosses each of which is located adjacent the inlet of a distributor passage to which a stock flow is delivered obliquely. The bosses serve to establish an eddy flow in the region of each inlet so that the stock flows into each inlet substantially radially inwardly of the passage axis. Each boss is sized with a maximum height adjacent an inlet and a breadth of substantially the breadth of the inlet.

Abstract: An improved headbox for a papermachine is provided wherein a pair of lobed rotors which extend the full width of the headbox are mounted for delivering paper making stock to rotation in the headbox. As the rotors are rotated, the lobes create a pumping action which withdraws the paper making stock from the distributor manifold and delivers it to the discharge nozzle of the headbox. Simultaneously, the lobes, acting in concert with a closely fitted housing also located within the headbox introduce a shear force on the paper making stock which produces high intensity small scale turbulence in the stock. In this regard, the lobed rotors perform two functions, (1) to deliver a uniformly metered quantity of paper making stock to the slice region, and (2) to impose a high intensity shear field on the stock to break up the flocculation that normally occurs.

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: The lip at the outlet of the nozzle duct is mounted along with the adjusting mechanism in a structural unit which is pivotally mounted on the casing. This allows the lip to be moved away from the permeable element to expose the nozzle duct and guide device for cleaning.

Abstract: A headbox construction for a papermaking machine which comprises a slice chamber connected to a preslice flow chamber by means of a perforate member. The slice chamber contains a plurality of plates and/or filaments attached to said perforate member and extend in the direction of stock flow through said slice chamber and define therein a multiplicity of relatively narrow channels of decreasing cross-sectional area in the direction of flow.

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.