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| Number | Title | Issue Date |
| 7931779 | Screening apparatus and screen basket for screening pulp suspensions A screen for the screening of pulp suspensions is disclosed, including a screen basket, a rotor for providing pressure and suction pulses in the suspension to be screened along the screen basket, and a dilution liquid header for supplying dilution liquid to countera... | 04/26/2011 |
| 7799173 | Screen plates having diagonal slots with curved inlets for a digester A screen plate for a cellulosic material puling vessel, the screen plate including: slots having curved inlet corner edges adjacent an inside surface of the screen plate and facing a pulp flow. ... | 09/21/2010 |
| 7658820 | Digester wash extraction by individual screen flow control A continuous digester comprises a wash zone having a plurality of individual wash screens disposed about an inner wall of the digester for the withdrawal of co-current downflow liquor from the wash zone. A conduit is connected in fluid communication between each of ... | 02/09/2010 |
| 7641767 | Apparatus for treating a fibrous suspension An apparatus and method serves, e.g., to deaerate, clean or screen a fibrous suspension and is provided with a closed housing and a rotor arranged centrally therein. The rotor puts at least a part of the fibrous suspension guided into the housing into a rotational f... | 01/05/2010 |
| 7497927 | Continuous digester with fluid circulation The arrangement concerns an improved design for at least one of the cooling, dilution and washing at the bottom of a continuous digester for the production of cellulose pulp. By arranging at least one extra strainer section above the lowermost strainer section, with... | 03/03/2009 |
| 7491296 | Multi-stage screening apparatus, screen basket and method for screening pulp suspensions Screening apparatus for screening pulp suspensions is disclosed comprising a screen basket dividing the interior of the housing into a central chamber and a single outer annular chamber. The suspension is supplied to one of the outer and central chambers, so that an... | 02/17/2009 |
| 7470347 | Device and method withdrawing cellulose pulp from a container This is a device and a method for withdrawing cellulose pulp with a pulp concentration of 8-14% from a cylindrical storage tower. The storage tower has a plane bottom and with a diameter that exceeds 3 meters. A pipe is arranged through the wall of the storage tower... | 12/30/2008 |
| 7387708 | Process for feeding pulp into a blow tank or storage tank A method and apparatus for treating pulp in connection with a blow tank or a storage tank. The pulp is discharged from a batch digester and fed either to the upper or the lower part of a blow tank, depending on the consistency of the pulp being discharged from the d... | 06/17/2008 |
| 7381302 | Method and arrangement for impregnating chips The method and an arrangement are for improved impregnation of chips in association with the manufacture of chemical cellulose pulp. Un-steamed chips are fed into an impregnation vessel (30) in which a fluid level (LIQ_LEV) is established under the highest le... | 06/03/2008 |
| 7309401 | Top separator for gas phase and hydraulic phase continuous digesters and method for converting digester 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 ... | 12/18/2007 |
| 7285179 | Continuous digester for cellulose pulp including method and recirculation system for such digester The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd, 3rd, 4th and 5th down through the digester, that have a successively dec... | 10/23/2007 |
| 7279070 | Method for the continuous cooking of wood raw material for cellulose pulp The invention concerns a simplified method for the continuous cooking of wood raw material in the form of sawdust for the production of cellulose pulp, The method does not require any thickening stages and can be carried out with a minimum of process equipment. The ... | 10/09/2007 |
| 7229524 | Feeding arrangement for feeding of chips to chip bins The invention relates to a feed arrangement for feeding chips to chip bins (1) in the production of cellulose pulp in continuous digesters (16), in which the chip bin is constituted by a treatment vessel having a top and a bottom, in which the chips ar... | 06/12/2007 |
| 7229526 | Method and apparatus for the feeding of fibers A system for feeding fibres from a fibre separation step at a first pressure to a drying step at a second, lower pressure, the system comprising a sluice feeder (3) provided between the fibre separation step and the drying step. At least an outlet (14)... | 06/12/2007 |
| 7152522 | Screw press with radial gate valve and supported screw shaft A screw press is provided having a radial gate valve and supported longitudinally-extending screw shaft. The screw shaft includes a central shaft and helical threads which is driven by a drive package. The screw shaft is encapsulated within a housing including a hop... | 12/26/2006 |
| 7147750 | Extraction with compaction and springback considerations 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 d... | 12/12/2006 |
| 7105076 | Gas phase continuous digester having an inverted top separator with liquor injection 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 i... | 09/12/2006 |
| 7013287 | Stock preparation monitoring system and method of same A stock preparation system includes a stock preparation apparatus and a sensor coupled with the stock preparation apparatus. The sensor is configured for sensing a physical parameter associated with the stock preparation apparatus, and includes a wireless transmitte... | 03/14/2006 |
| 7001483 | Apparatus for making carboxylated pulp fibers An apparatus for carboxylating wood pulp which utilizes the wood pulp bleach plant and the method of carboxylating the pulp which takes place in the bleach plant. ... | 02/21/2006 |
| 6958109 | Process for feeding pulp into a blow tank or storage tank A method and apparatus for treating pulp being fed into a blow tank or a storage tank. A preferred embodiment is that the pulp is discharged from a batch digester (10) and fed either to the upper or lower part of a blow tank (20), depending on the cons... | 10/25/2005 |
| 6953315 | Apparatus and method for controlling flow of process materials An apparatus and method for controlling the flow of a process material from a higher pressure environment to a lower pressure environment is provided. Each of a first and second chamber is divided into a product region and a control region by a flexible boundary. In... | 10/11/2005 |
| 6841042 | Feeding comminuted fibrous material using high pressure screw and centrifugal pumps 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 co... | 01/11/2005 |
| 6719878 | Method for avoiding mechanical damage of pulp A method for producing chemical pulp from cellulosic material by means of alkaline cooking, including cooking the material to pulp at cooking temperature in a digester, reducing the temperature at the end of the cook, substantially relieving the overpressure in the ... | 04/13/2004 |
| 6673201 | Top separator with intraseal for digester vessel in a pulp or fiber processing system 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 moun... | 01/06/2004 |
| 6589391 | Top separator with intraseal for digester vessel in a pulp or fiber processing system 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 moun... | 07/08/2003 |
| 6569289 | Cellulose slurry treating systems for adding AQ to a cellulose slurry in the substantial absence of alkali 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 substantia... | 05/27/2003 |
| 6551462 | System for feeding comminuted fibrous material 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 transfe... | 04/22/2003 |
| 6506283 | Pretreatment of chips before cooking 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 ab... | 01/14/2003 |
| 6497791 | Apparatus for pre-treatment of wood chips A pre-treatment device for wood chips for pulping comprises a tube through which the wood chips fall into a digester. Steam is injected into the tube through rings of nozzles, which are angled circumferentially to impart a rotary and turbulent motion to t... | 12/24/2002 |
| 6491188 | Revolver valve for discharging a pressurized vessel in a fiber stock preparation system A revolver valve includes a housing with a cylindrical inner chamber, and a pair of end caps respectively attached to each end of the housing. One of the end caps includes an inlet opening and the other end cap includes an outlet opening. A cylindrical ro... | 12/10/2002 |
| 6451165 | Channel pulper A pulper in a stock preparation system includes a housing with a fiber inlet, at least one water inlet, at least one outlet and an inner chamber. A plurality of rotatable augers extend into the inner chamber.... | 09/17/2002 |
| 6451172 | In-line drainer enhancements 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... | 09/17/2002 |
| 6447645 | Feeding cellulose material to a treatment vessel 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 mini... | 09/10/2002 |
| 6436233 | Feeding cellulose material to a treatment vessel 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 mini... | 08/20/2002 |
| 6432264 | Method of making a vessel assembly for handling comminuted cellulosic fibrous material 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... | 08/13/2002 |
| 6418963 | Pipe attachment A pipe attachment comprises a pipe elbow that is tightly attached to a stand pipe so that the diameter of the stand pipe is greater than the diameter of the pipe elbow.... | 07/16/2002 |
| 6379504 | Apparatus for pulping sawdust 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° F., is produced. The heated slurry is, at supe... | 04/30/2002 |
| 6375795 | Minimization of malodorous gas release from a cellulose pulp mill feed system The release of malodorous TRS-containing gases from a comminuted cellulosic fibrous material feed system for a digester is minimized utilizing a particular arrangement associated with a pressure isolation device. Material is fed through the pressure isola... | 04/23/2002 |
| 6368453 | Chip feeding to a comminuted cellulosic fibrous material treatment vessel 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 with... | 04/09/2002 |
| 6340409 | Method for multistage bleaching using gaseous reagent in the first stage with controlled gas release A pulp bleaching line has an initial stage using gaseous bleaching reagent followed by its subsequent stages without intervening washing or pumping steps. The pulp is transported from the initial stage through a mixer in which the pulp is heated and/or do... | 01/22/2002 |
