| Patent Number |
Title Of Patent |
Date Issued |
| RE39208 |
Method of treating material in a continuous digester |
August 1, 2006 |
| A comminuted cellulosic fibrous material treatment vessel assembly includes a substantially vertical vessel having a top, bottom, and outlet, and through which the material flows in a flow direction. The vessel preferably has a substantially cylindrical wall with at least one diamete |
| 7575658 |
Vacuum washer drum |
August 18, 2009 |
| A vacuum drum washer is designed to enable the use of an end-draining drum for drum lengths exceeding 20 feet. The drum washer includes a cylindrical drum having a mesh screen defining an exterior wall. A plurality of outer filtrate channels are disposed radially inward from the mesh |
| 7560008 |
Extraction with compaction and springback considerations |
July 14, 2009 |
| A vessel is constructed with (preferably substantially stationary) screen surfaces which minimize compaction of comminuted cellulosic fibrous material, and allow springback of the material, as it flows downwardly. A slurry of wood chips, sawdust, or pulp is passed downwardly past one or |
| 7556713 |
Method and system for feeding cellulose chips to a high pressure continuous cooking system |
July 7, 2009 |
| A method for feeding a cellulosic fibrous material to a high pressure processing vessel including: pressurizing a low pressure flow of the fibrous material in a high pressure transfer device; discharging a high pressure flow of the fibrous material from the transfer device to a condu |
| 7478773 |
Tooth refiner plates having V-shaped teeth and refining method |
January 20, 2009 |
| A refiner plate including a generally planar surface having annular rows of teeth arranged concentrically on the plate, and at least one of said rows includes teeth including a leading edge corner angle of less than 90 degrees. These teeth may include a leading sidewall having a radially |
| 7472855 |
Refiner stator plate having an outer row of teeth slanted to deflect pulp and method for pulp de |
January 6, 2009 |
| A refiner stator plate having concentric rows of teeth wherein an outer row is at or near an outer periphery of the plate, and the outer row teeth include leading sidewalls slanted to deflect high-velocity refining particles moving along a radial line between the plates. |
| 7458533 |
Tooth refiner plates with varying feeding angles and refining method |
December 2, 2008 |
| A method for refining material between opposing discs in a refiner including feeding the material to an inlet of at least one of the discs rotating one disc with respect to the other disc while the material moves radially outward between the discs, and subjecting the material to impa |
| 7455749 |
Gas phase continuous digester having an inverted top separator with liquor injection |
November 25, 2008 |
| A method for adding cooking liquor into a vapor phase continuous digester for producing chemical cellulose pulp from cellulose chips including: introducing a slurry of the cellulose chips from a feed system to an inverted top separator in a top vapor phase section of the digester; di |
| 7398938 |
Conical refiner plates with logarithmic spiral type bars |
July 15, 2008 |
| A special shape of bars on refining cones or plate segments of a rotating conical refiner is disclosed including a plurality of bars generally extending outwards towards the outer end of the cone across its working surface, arranged in a single, two or more radial zones, the plurality of |
| 7374050 |
High capacity and high efficiency filter deck assembly |
May 20, 2008 |
| 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 |
| 7357074 |
Compression screw with combination single and double flights |
April 15, 2008 |
| A screw for a compression dewatering device comprising an elongated shaft having axially spaced apart first and second ends, a conveying section at the first end of the shaft, having a single helical screw flight rigidly projecting from the shaft, a flightless transition section axially |
| 7347916 |
Vacuum washer drum |
March 25, 2008 |
| A vacuum drum washer is designed to enable the use of an end-draining drum for drum lengths exceeding 20 feet. The drum washer includes a cylindrical drum having a mesh screen defining an exterior wall. A plurality of outer filtrate channels are disposed radially inward from the mesh |
| 7314556 |
Filter disc with panel sectors |
January 1, 2008 |
| A panel sector, for a disc filter for separation of liquids from a suspension, includes front and back filter panel assemblies, a sector assembly for mounting the front and back filter panel assemblies, and a top cap for retaining the filter panel assemblies within the sector assembl |
| 7309401 |
Top separator for gas phase and hydraulic phase continuous digesters and method for converting d |
December 18, 2007 |
| A continuous digester for producing chemical cellulose pulp from cellulose chips including: a digester vessel with an upper section attached to a top separator and said vessel at least partially filled with the cellulose chips and a liquor; a top separator at least partially in said |
| 7300550 |
High intensity refiner plate with inner fiberizing zone |
November 27, 2007 |
| Plate elements, a plate configuration, and associated system for thermomechanical refining of wood chips wherein destructured and partially defibrated chips are fed to a rotating disc primary refiner, where opposed discs each have an inner band pattern of bars and grooves and outer b |
| 7300541 |
High defiberization chip pretreatment |
November 27, 2007 |
| A chip pretreatment process which comprises conveying the feed material through a compression screw device having an atmosphere of saturated steam at a pressure above about 5 psig, decompressing and discharging the compressed material from the screw device into a decompression region, |
| 7300540 |
Energy efficient TMP refining of destructured chips |
November 27, 2007 |
| A system and method for thermomechanical refining of wood chips comprises preparing the chips for refining by exposing the chips to an environment of steam to soften the chips, compressively destructuring and dewatering the softened chips to a solids consistency above 55 percent, and dil |
| 7300008 |
Tooth refiner plates with varying feeding angles and refining method |
November 27, 2007 |
| A refiner plate including: concentric rows of teeth and the teeth arranged facing radially inward, the sidewalls of the teeth are at an angles to radii of the plate such that the angle of teeth in a first row(s) of teeth differs from the angle of teeth in a second row(s) of teeth. |
| 7293659 |
Drum structure for rotary drum filtering apparatus and methods of using same |
November 13, 2007 |
| A drum structure for corrugated type rotary filters has relatively high filtering efficiency and relatively low manufacturing and/or installation costs. More specifically, a corrugated deck section is rigidly connected to a rotary drum structure by means of solid non-apertured divider gr |
| 7172148 |
Grooved pyramid disperger plate |
February 6, 2007 |
| A disperger plate segment, for removing contaminants from recycled, or recovered, paper and packaging materials includes radially concentric rows of teeth. Each row of teeth includes teeth and channels disposed intermediate the teeth. Each of the teeth have an upper, top surface, a r |
| 7147750 |
Extraction with compaction and springback considerations |
December 12, 2006 |
| A vessel is constructed with (preferably substantially stationary) screen surfaces which minimize compaction of comminuted cellulosic fibrous material, and allow springback of the material, as it flows downwardly. A slurry of wood chips, sawdust, or pulp is passed downwardly past one or |
| 7105076 |
Gas phase continuous digester having an inverted top separator with liquor injection |
September 12, 2006 |
| A continuous digester is disclosed for producing chemical cellulose pulp from cellulose chips, comprising: a continuous digester vessel having a lower section filled with the cellulose chips and an upper gas filled section; an inverted separator at least partially in said upper section |
| 6899791 |
Method of pretreating lignocellulose fiber-containing material in a pulp refining process |
May 31, 2005 |
| A method and apparatus for pretreating or conditioning lignocellulose fiber containing feed material in preparation for conversion to pulp. Wood chips are pretreated under conditions of elevated temperature, pressure and humidity and subsequently compressed to cause destructuring of the |
| 6841042 |
Feeding comminuted fibrous material using high pressure screw and centrifugal pumps |
January 11, 2005 |
| A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfer device conventionally used in t |
| 6705859 |
Tapered grizzly bars for lime kiln |
March 16, 2004 |
| A grizzly bar device for a rotating kiln having an annular array of bars having at least two adjacent bars, wherein the thickness the bars is reduced in lateral and radial directions, and gap between the adjacent bars increases in width as the bars extend laterally from front to back of |
| 6673201 |
Top separator with intraseal for digester vessel in a pulp or fiber processing system |
January 6, 2004 |
| A top separator assembly for a digester is disclosed comprising: a rotatable shaft for the top separator; a packing for the shaft; and a sealing ring operatively mounted to the shaft and having a nominal clearance with the pack box, said sealing ring mounted so that up lifting of sai |
| 6669410 |
High pressure feeder having smooth pocket in rotor |
December 30, 2003 |
| A high pressure transfer device has a rotor mounted in a housing for rotation with respect to inlet and outlet ports and having through going pockets. The pockets have interior surface configurations substantially devoid of nooks, crannies, and related flow restrictions. This can be |
| 6649068 |
Filtration of pulp mill liquids |
November 18, 2003 |
| A fiber mat is formed on a screen cylinder of a pressurized fiber filtering device used to filter particles from a liquid stream. The fiber mat is a fine particle filter to remove small particles from the liquid stream. The fiber mat is formed by injecting cellulosic fibers into the liqu |
| 6641336 |
High pressure feeder rotor having conduits for pressure equalization |
November 4, 2003 |
| A conduit extends laterally through a rotor of a high pressure feeder to relieve any unequal pressures acting on opposite ends of the rotor. The conduit allows slurry under extraordinarily high pressure at one end of the rotor, to flow laterally through the rotor, and be released through |
| 6616384 |
High pressure feeder having smooth pocket in rotor |
September 9, 2003 |
| A high pressure transfer device has a rotor mounted in a housing for rotation with respect to inlet and outlet ports and having through going pockets. The pockets have interior surface configurations substantially devoid of nooks, crannies, and related flow restrictions. This can be |
| 6589391 |
Top separator with intraseal for digester vessel in a pulp or fiber processing system |
July 8, 2003 |
| A top separator assembly for a digester is disclosed comprising: a rotatable shaft for the top separator; a packing for the shaft; and a sealing ring operatively mounted to the shaft and having a nominal clearance with the pack box, said sealing ring mounted so that up lifting of sai |
| 6582554 |
Continuous digester having a sectioned top separator with multiple liquor extraction ports |
June 24, 2003 |
| A method is disclosed for extracting liquor from a cellulose slurry for a continuous digester comprising the steps of: providing the cellulose slurry of liquor and chips of cellulose fiber material to a separator; extracting a first stream of liquor from the separator; extracting a s |
| 6576084 |
Method of pretreating pulp with yield or strength-enhancing additive |
June 10, 2003 |
| Chemical pulp is produced from a slurry of comminuted cellulosic fibrous material using a beneficial additive such as AQ, or polysulfide. In the first treatment zone the effective alkali concentration and temperature conditions are such so that substantially no alkali degradation of the |
| 6569289 |
Cellulose slurry treating systems for adding AQ to a cellulose slurry in the substantial absence |
May 27, 2003 |
| Chemical pulp is produced from a slurry of comminuted cellulosic fibrous material using a beneficial additive such as AQ, or polysulfide. In the first treatment zone the effective alkali concentration and temperature conditions are such so that substantially no alkali degradation of the |
| 6551462 |
System for feeding comminuted fibrous material |
April 22, 2003 |
| A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfer device conventionally used in t |
| 6544384 |
Pretreatment of chips before cooking |
April 8, 2003 |
| The strength properties of chemical cellulose pulp (particularly kraft pulp) are improved by substituting a cold impregnation soak for conventional impregnation procedures. After steaming, wood chips are soaked in an alkaline liquid at a temperature of about 80-110.degree. C. (prefer |
| 6524436 |
Flash tank steam economy improvement |
February 25, 2003 |
| By the utilization of a jet ejector (such as a thermocompresser) in a cellulose chemical pulp mill, it is possible to effectively increase the utilization of steam. The volume of steam from a flash tank which flashes black liquor from a pulp digester may be increased (e.g. at least about |
| 6506283 |
Pretreatment of chips before cooking |
January 14, 2003 |
| The strength properties of chemical cellulose pulp (particularly kraft pulp) are improved by substituting a cold impregnation soak for conventional impregnation procedures. After steaming, wood chips are soaked in an alkaline liquid at a temperature of about 80-110.degree. C. (prefer |
| 6475338 |
Method of minimizing transition metal ions during chemical pulping in a digester by adding chela |
November 5, 2002 |
| The production of chemical (e.g., kraft) cellulose pulp much more suited to totally chlorine free or elemental chlorine free bleaching is produced by reducing the bleaching chemical consumability of the produced pulp. The effective alkalinity of the pulp during at least the majority of t |
| 6468006 |
High pressure feeder having restriction ramp in high pressure inlet |
October 22, 2002 |
| A high pressure transfer device has a rotor mounted in a housing for rotation with respect to inlet and outlet ports and having through going pockets. The pockets have interior surface configurations substantially devoid of nooks, crannies, and related flow restrictions. This can be |
| 6451172 |
In-line drainer enhancements |
September 17, 2002 |
| A drainer for a feed system for a cellulose digester has a substantially open and hollow inlet (devoid of a spiral flow imparter or a like flow restriction) and a substantially annular screen within an elongated housing having a flow direction between the housing inlet and outlet. The |
| 6451163 |
Method of handling comminuted cellulosic fibrous slurry in a cylindrical vessel |
September 17, 2002 |
| In a cellulose pulp handling vessel having a first diameter material storing or treating portion above a second diameter discharge which is at least 20% less than the first diameter, reduced compression of the material and reduced power requirements of an agitator (if used), compared |
| 6447645 |
Feeding cellulose material to a treatment vessel |
September 10, 2002 |
| A feed system for a cellulose pulp treating vessel (such as a continuous digester) is not limited by the required L/W ratio of the pump feeding a wood chip slurry to a high pressure transfer device, the feed system may be kept at a low temperature to minimize flashing of liquid into stea |
| 6436233 |
Feeding cellulose material to a treatment vessel |
August 20, 2002 |
| A feed system for a cellulose pulp treating vessel (such as a continuous digester) is not limited by the required L/W ratio of the pump feeding a wood chip slurry to a high pressure transfer device, the feed system may be kept at a low temperature to minimize flashing of liquid into stea |
| 6432264 |
Method of making a vessel assembly for handling comminuted cellulosic fibrous material |
August 13, 2002 |
| In a cellulose pulp handling vessel having a first diameter material storing or treating portion above a second diameter discharge which is at least 20% less than the first diameter, reduced compression of the material and reduced power requirements of an agitator (if used), compared |
| 6379504 |
Apparatus for pulping sawdust |
April 30, 2002 |
| Chemical cellulose pulp is made from sawdust utilizing a static down-flow retention vessel. By adding steam and cooking liquor to a flow of sawdust a heated slurry, at a cooking temperature of about 250-350.degree. F., is produced. The heated slurry is, at superatmospheric pressure, move |
| 6375796 |
Method of treating material in a continuous digester |
April 23, 2002 |
| A comminuted cellulosic fibrous material treatment vessel assembly includes a substantially vertical vessel having a top, bottom, and outlet, and through which the material flows in a flow direction. The vessel preferably has a substantially cylindrical wall with at least one diamete |
| 6368453 |
Chip feeding to a comminuted cellulosic fibrous material treatment vessel |
April 9, 2002 |
| In the feeding of a slurry of comminuted cellulosic fibrous material to a digester (continuous or batch) in the production of chemical pulp, one of the tanks used in the feed system (which preferably includes a high pressure feeder) may be eliminated without consequent loss of its functi |
| 6364998 |
Method of high pressure high-speed primary and secondary refining using a preheating above the g |
April 2, 2002 |
| The combination of low residence time (R) with high saturation pre-heat temperature/pressure (T) followed by high speed disc refining (S), is utilized in both primary and secondary refining stages. This use of the RTS process in both primary and secondary refining stages, can be acco |
| 6082907 |
Pre-loading device for a radical-bearing unit |
July 4, 2000 |
| Axially spaced radial bearing units (30, 50) for a shaft assembly are pre-loaded by hydraulic pressure. Each of the bearing units is mounted to an axially displaceable seat (40, 60). The pre-loading pressure between the two bearing units (30, 50) is maintained at a constant pre-loading |
