Ingersoll-rand Company

Beloit Technologies, Inc.

Oscar Luthi

Armand G. Truchon

Gl&v International Inc.

Lawrence A Carlsmith

Frederick S Lewis

A Sean Vote

Anthony G Abdulmassih

Douglas L Young

Jules L Dussourd

Eugene L Krasnoff

Antoine G Abdulmassih

Donald B Johnson

Frank J Merchel, Iii

Armand G Truchon

An apparatus produces elongate multi-fiber particles of extremely small size to facilitate substantially complete penetration of high consistency pulp fibers by ozone when exposed thereto. A housing is provided having first and second ends and a substantially smooth interior housing surface. A means is provided for introducing high consistency wood pulp into the housing. A source of ozone gas bleaches the high consistency pulp within the housing. A pin rotor is rotatably mounted within the housing, and includes a plurality of pins, each pin having a pin tip. A means is provided means for limiting the build up of high consistency pulp fiber accretions on the pin tips.

Apparatus for producing small particles from high consistency wood pulp

A method and apparatus for cooling wood pulp, coming from a high temperature bleaching stage at a consistency of approximately 10%, prior to introducing the wood pulp to a low temperature bleaching stage, including the steps of exposing the pulp to a thickening press in order to extract sufficient liquor from the pulp to increase the consistency to more than 25%; fluffing the pulp and depositing it on a moving bed cooler having a provision for blowing air through the pulp; and blowing cooling air through the pulp by using an air pump device with appropriate ducting. By first thickening the pulp, the mass of pulp to be cooled is significantly reduced and energy savings proportionate to the mass reduction are realized.

Method for cooling and ozone bleaching wood pulp

A rotary drum filter valve is provided with a valve having a valve segment with a first part which partially restricts the flow of filtrate from a head section and a second part which blocks from the head section.

Air inflow restrictor for vacuum filters

A drum having a longitudinal axis, and an outer periphery, has a multiplicity of longitudinal, drainage grooves formed therein, and a cylindrical sheath encloses the drum, the sheath having a multiplicity of holes formed therein. The drum is imperforate. A pair of the drums is employed in a twin-roll press as press rolls, and one thereof is used in a single roll press with a compaction baffle. In one embodiment, the press roll has its grooves formed in a herringbone pattern, the same pointed in the direction of rotation, to enhance drainage. In another embodiment, the longitudinal drainage grooves have increasing depth, toward a mid-length of the press roll where they open into inner-drum drainage conduits which discharge the filtrate adjacent the rotary axis of the press roll.

Pulp slurry-handling press roll and twin and single roll slurry handling

Wood pulp ozone bleaching contactor

Deflecting vanes, confronting the blades of the impeller-inducer, and fixed in the housing, inhibit the formation of a vortex upstream of the impeller-inducer. Too, the vanes direct the recirculation flow back into the central zone of the pump. The impeller-inducer is force-fed by its own recirculation.

Pulp slurry-handling, centrifugal pump

A rotary filter valve is provided with a variable restriction of the timing plate which minimizes bypass gas entering the vacuum system during emergence of the filter elements from the submerged condition.

Air inflow restrictor for disc filters

An anti rewet deck is provided for press rolls used to increase consistency of fibrous pulp slurry from approximately 4 percent up to about 30 to 50 percent. This is accomplished by biasing the location of the drainage holes in the roll shell to the forward edge of the drainage compartments within the roll shell. To avoid the necessity for handing of the rolls, a mechanism is provided for accomplishing the purposes of minimizing rewet at practical production rates by providing baffle plates which effectively orient the draining pattern in the desired direction. Such baffles can be permanently or removably installed once the desired handing of the rolls is determined.

Anti-rewet deck for press rolls

A chamber having a slurry-admitting inlet at one end has a metering opening lengthwise thereof for feeding slurry to an associated slurry processing machine. A rotatable bar, having a plurality of spaced apart grooves formed therein, is disposed in immediate proximity to the metering opening to control slurry-flow through the opening. The grooves insure that access to the opening, by the slurry, will be greater than the largest floc diameter of the pulp at all operating conditions.

Inlet slice assembly, for a pulp slurry processing machine

A hydrodynamic device for generating negative pressure excursions in a pulp slurry during fine screening, includes at least one half-foil member disposed on a substantially cylindrical outer surface of a rotor. The rotor is mounted within and co-axial with a substantially cylindrical screen having a circumferentially continuous apertured zone to define an annular screening chamber between the rotor and the screen. The half-foil member is collectively at least axially co-extensive with the apertured zone and has a leading edge which, also collectively, is inclined at a spiral angle relative to the axis of the rotor such that, in one embodiment, during rotation, the leading edge of the half-foil member conducts large particles downwardly through the screening chamber. A selection of hydrodynamic foil configurations is provided in order to adapt to a wide range of pulp types and screening conditions.

Screening apparatus for papermaking pulp

A rotating disc filter has a plurality of discs, each made of a plurality of sectors removably mounted on support structures which are fixed on a rotating hollow shaft into core drainage channels of which, the sectors drain. The drainage and support structure has flow channels designed to rapidly drain filtrate and to permit filtrate split between clear and fiber bearing fractions. Rapid drainage is made possible by a novel method and device for controlling fluid transit volume within the sectors.

Method and apparatus for control of filtrate volume in a disc filter

Multiphase washing of pulp is accomplished on a fully pressurized drum filter by employing compaction baffles to increase the consistency of the pulp mat and by providing a separate pump for each wash zone so that there is no pressure difference between the wash zones and, thus, no need for any mat contacting mechanical seal. This avoids mat disruptions and machine clogging often caused by pulp pile-up at such seals. Feed pulp of relatively high consistency is made possible by incorporation of a deflocculator and distributor in the pulp feed nozzle.

Multiphase pulp washer

A rotary drum filter has a plurality of longitudinally extending division grids mounted about the outer circumference of a drum. A plurality of corrugated sheets are provided, with the leading and trailing edges of each sheet mounted to circumferentially adjacent pairs of division grids to define filtrate compartments. An equivalent number of perforated filter plates are also provided. Each filter plate is attached to the top of a corrugated sheet and has a leading edge that is set back from the leading edge of the attached sheet. A seal member is positioned at the leading edge of each corrugated sheet and has a first leg extending between the filter plate and the corrugated sheet. The seal member further includes a second leg which abuts the leading edge of the corrugated sheet so as to block the open ends at the leading edge of the corrugated sheets.

Filter deck assembly sliding seal

A method and apparatus for forming on the outside of a permeable, rotatable drum by feeding a pulp slurry through a mat forming and pressing zone, followed by a mat washing zone. In the mat washing zone, the mat is washed with liquid from the first source and then washed with liquid from a second source. A Washing baffle has a first portion extending from its upstream end partially along the outside surface of the drum and slightly spaced from the outside surface of the drum. This first portion is followed by a second portion extending partially along the outside surface of the drum and spaced further from the outside surface of the drum than the first portion. A valve is provided for controlling the velocity of liquid through a slot into a circumferential space separating the washing baffle from the drum.

Pressure pulp washer

An air-tight vat under pressure completely encloses a rotatable drum. The vat is constructed so that it may be completely submerged in liquid. The vat has a liquid filled take-off chamber. The pulp is fed to the vat through a pulp inlet. The pulp is formed and compacted to form a pulp mat. Directly following the forming and compacting of the pulp is a washing zone for washing the pulp mat. After washing the pulp mat is again compacted. The pulp mat is removed from the drum at a removal point located in the liquid filled take-off chamber, thus providing a pulp suspension in the take-off chamber. The suspension is removed from the vat through a pulp outlet extending from the liquid filled take-off chamber.

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Nashua, NH, United States of America

Oscar Luthi