Mechanical Defibration In The Presence Of Heated Gas Or Gas Under Pressure Patents (Class 162/23)
  • Patent number: 10428288
    Abstract: The invention concerns a method for transforming a biomass into at least one biochar, comprising the following steps of: (a) Providing a ground and dried biomass, said biomass containing at least 30% of a lignocellulosic biomass, by mass relative to the dry weight of the ground and dried biomass; (b) Heating progressively this biomass to a temperature higher than 140° C. and lower than 350° C., in an oxygen-free gas stream, under a pressure comprised between 1 and 40 bar; (c) Allowing the reaction to proceed by maintaining the temperature in the 300-700° C. range and the pressure in the 1-40 bar range; (d) Cooling the biomass derived from step (c), at a temperature of at most 100° C., in an oxygen-free gas stream; and (e) Collecting the biochar. The invention also concerns the thus obtained biochar.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: October 1, 2019
    Assignee: BIOCARBON INDUSTRIES S.À R.L.
    Inventor: Jean-Paul Vieslet
  • Patent number: 10233570
    Abstract: It is disclosed a process for increasing the enzymatic accessibility of a thermally treated ligno-cellulosic biomass feedstock which has been thermally treated at a severity factor. The process comprises a step of fiber shives reduction, for reducing the amount of long shives. The thermally treated ligno-cellulosic biomass after fiber shives reduction is characterized by having an increased glucans accessibility and by forming a slurry having a low viscosity.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: March 19, 2019
    Assignee: Versalis S.p.A.
    Inventors: Piero Ottonello, Paolo Torre, Stefano Paravisi, Chiara Prefumo, Pietro Pastorino, Dario Giordano
  • Patent number: 9951476
    Abstract: The present invention provides a pulping method. Caustic soda is replaced with cheap lime to manufacture pulp in high efficiency, and meanwhile complexation, flocculation and acid-base neutralization of aluminum sulfate are further utilized, so as to recycle effective ingredients in a black liquid, achieve a yield approximate to a mechanical pulp yield, obtain quality of the chemical pulp, implement cyclic utilization of the black liquid and solve the pollution thereof.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: April 24, 2018
    Assignee: Beijing Insight Biomass LLC
    Inventors: Yingwu Yin, Peng Wan, Honggui Yu, Yujuan Zhang, Xiangxiang Sun, Lingyan Zhang
  • Patent number: 9227241
    Abstract: A composition for use in investment casting shells and a method of making the composition is disclosed. The composition includes an engineered binder and a refractory flour. The engineered binder comprises a siliceous material and at least one organic component selected from: at least one type of wood pulp; at least one species of cellulose fiber; and combinations thereof. A particular benefit of the investment shell composition is simultaneously increased permeability and load bearing capacity.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: January 5, 2016
    Assignee: Nalco Company
    Inventor: Sankar Bhattacharja
  • Patent number: 9192936
    Abstract: A method for crushing and drying damp wood, wherein the wood is introduced into an impact reactor, which has a substantially cylindrical main body, in the closed interior space of which there rotates a rotor with at least one impact element, which contacts the wood and crushes it into part-constituents while generating a great transfer of momentum. The interior space of the cylindrical main body is assigned a suction removal device, which during the impact crushing removes the mist of moisture produced when the impact element makes contact with the material, and the interior space of the cylindrical main body has admitted to it hot gas, heated by waste heat from a combustion process, at a temperature of less than 95° C., in particular less than 80° C., or the exhaust gas from a combustion process, which after a collision of the impact element with a material constituent penetrates the material constituent in place of the moisture leaving. Also a device for carrying out the method.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: November 24, 2015
    Assignee: PROACTOR SCHUTZRECHTSVERWALTUNGS GMBH
    Inventor: Ralf Schaefer
  • Patent number: 8753476
    Abstract: Methods of producing mechanical pulps from lignocellulosic material including partial defibration of lignocellulosic material in a chip press followed by liquid impregnation, preheating the lignocellulosic material for 20 seconds or less at a pressure between 7.5 and 12 bar (gauge) prior to mechanically refining the lignocellulosic material in a primary mechanical refiner at a pressure between 7.5 and 12 bar (gauge), thus obtaining a high freeness pulp.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: June 17, 2014
    Assignee: Andritz Technology and Asset Management GmbH
    Inventor: Marc Sabourin
  • Patent number: 8691050
    Abstract: Continuous transfer of particulate material into pressurized steam reactors is provided by “flow feeder” methods and devices. Material such as lignocellulosic biomass feedstocks are compacted into a “low density” plug, <700 kg/m3, which provides a dynamic seal against pressurized steam through exploitation of a steam condensation zone. The rate at which the steam condensation zone moves into the “low density” plug is offset by the rate at which compacted material is fed into the pressurized reactor. Preferred devices compact material within a flow feeder chamber by use of a loading device that works against counter-pressure provided by an unloading device. Compacted material is actively disintegrated and fed into the reactor by the unloading device. In preferred embodiments, compacted material is fed in a steady-state operation in which the interface between the steam condensation zone and the low pressure inlet zone remains stationary within the flow feeder chamber.
    Type: Grant
    Filed: November 23, 2009
    Date of Patent: April 8, 2014
    Inventor: Børge Holm Christensen
  • Patent number: 8613363
    Abstract: Disclosed is an integrated paper wherein the paper has capabilities and functionalities provided by both the fiber and the active agent ingredients, and a method of immobilizing the active agents within the integrated paper. The tight pore structure of the integrated paper of the present invention, a mean pore diameter of less than about 2 microns, provides short diffusion distances from a fluid to the surface of the paper ingredients by adsorption or diffusive interception making it an excellent medium for fluid filtration. The integrated paper of the present invention can further include a microbiological interception enhancing agent. The integrated paper can be formed using, preferably, wet laid paper-making processes for speed and efficiency. Also disclosed are devices utilizing the integrated paper useful in fluid filtration.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: December 24, 2013
    Assignee: KX Technologies LLC
    Inventor: Evan E. Koslow
  • Patent number: 8465621
    Abstract: A refiner steam separation system according to the present invention includes a blowline for transporting a mixture of fiber material from a refiner to an inlet of a steam separator. Waste steam is discharged from the separator through a waste steam outlet. Cleaned fiber material is discharged from the separator through an exit, which prevents a substantial portion of the waste steam from passing through the exit. A relay pipe communicates with the exit and a dryer duct, and transports cleaned fiber material therebetween. A resin input communicates with the relay pipe, and supplies resin therein. The resin is mixed with the cleaned fiber material prior to the cleaned fiber material being dried in the dryer duct. The present invention is also directed to a method of reducing VOC emissions generated during refining cellulosic fibrous material.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: June 18, 2013
    Assignee: Masonite Corporation
    Inventor: Dennis Henry Vaders
  • Patent number: 8157955
    Abstract: A system for collecting ligno-cellulosic biomass over a large area to enable the commercial refining of biomass from 2,500 to in excess of 50,000 tons of biomass per day to produce ethanol or other products. The biomass is collected at a series of collection points and then transported through a network of conduit “loops” interconnecting each of the collection points and the central refining plant. The water used to transport the biomass, as a slurry, is recovered and sequentially recycled in the same pipeline system to push the biomass slurry around the system in a “loop.” The outgoing and return legs of each loop optionally are located adjacent each other.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: April 17, 2012
    Assignee: Iogen Energy Corporation
    Inventor: Patrick J. Foody, Sr.
  • Patent number: 8057635
    Abstract: A system for collecting ligno-cellulosic biomass over a large area to enable the commercial refining of biomass from 2,500 to in excess of 50,000 tons of biomass per day to produce ethanol or other products. The biomass is collected at a series of collection points and then transported through a network of conduit “loops” interconnecting each of the collection points and the central refining plant. The water used to transport the biomass, as a slurry, is recovered and sequentially recycled in the same pipeline system to push the biomass slurry around the system in a “loop”.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: November 15, 2011
    Assignee: Iogen Energy Corporation
    Inventor: Patrick Foody, Sr.
  • Publication number: 20110114273
    Abstract: This invention reports an environmentally benign method of delignifying bleaching sequences to gain more than 80% ISO brightness for alkaline sulfite-anthraquinone (AS/AQ) wheat straw pulp comprising of AOPsYP0, AOPsEP0 and AOPsP0P1 sequences that yielded surprising results in the field of pulp and paper technology; wherein the selectivity of sequences resulted in the protection of ?-cellulose from degradation, produced significant drop in acid soluble lignin and yielded low viscosity losses reducing ecological impact of effluent load.
    Type: Application
    Filed: November 17, 2009
    Publication date: May 19, 2011
    Inventors: Naila Yaqoob, Ishtiaq-Ur-Rehman, Kausar Jamal Cheema, Sahibzada Rashad Hameed, Bushra Mateen
  • Patent number: 7943008
    Abstract: A method of making pulp adapted to be used in forming corrugating medium is disclosed. The method comprises cooking woodchips in a first liquor in the absence of an alkali addition. The method further comprises mechanically fiberizing the woodchips to form a pulp. The method further comprises separating hydrolyzate from the pulp. The method further comprises treating the pulp with a second liquor, the second liquor including at least one alkali. The method further comprises refining the pulp.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: May 17, 2011
    Assignee: Packaging Corporation of America
    Inventors: Ventzislav H. Kirov, Anil Sethy, Bryan L. Sorensen
  • Patent number: 7905983
    Abstract: A refiner steam separation system according to the present invention includes a blowline for transporting a mixture of fiber material from a refiner to an inlet of a steam separator. Waste steam is discharged from the separator through a waste steam outlet. Cleaned fiber material is discharged from the separator through an exit, which prevents a substantial portion of the waste steam from passing through the exit. A relay pipe communicates with the exit and a dryer duct, and transports cleaned fiber material therebetween. A resin input communicates with the relay pipe, and supplies resin therein. The resin is mixed with the cleaned fiber material prior to the cleaned fiber material being dried in the dryer duct. The present invention is also directed to a method of reducing VOC emissions generated during refining cellulosic fibrous material.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: March 15, 2011
    Assignee: Masonite Corporation
    Inventor: Dennis Henry Vaders
  • Patent number: 7846294
    Abstract: A system 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 diluting the destructured and dewatered chips to a consistency in the range of about 30 to 55 per cent. The destructuring partially defibrates the material. This diluted material is fed to a rotating disc primary refiner wherein each of the opposed discs has an inner ring pattern of bars and grooves and an outer ring pattern of bars and grooves. The destructured and partially defibrated chips are substantially completely defibrated in the inner ring and the resulting fibers are fibrillated in the outer ring.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: December 7, 2010
    Assignee: Andritz Inc.
    Inventors: Marc J. Sabourin, Luc Gingras
  • Patent number: 7771565
    Abstract: A method of making pulp adapted to be used in forming corrugating medium is disclosed. The method comprises cooking woodchips in a first liquor in the absence of an alkali addition. The method further comprises mechanically fiberizing the woodchips to form a pulp. The method further comprises separating hydrolyzate from the pulp. The method further comprises treating the pulp with a second liquor, the second liquor including at least one alkali. The method further comprises refining the pulp.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: August 10, 2010
    Assignee: Packaging Corporation of America
    Inventors: Ventzislav H. Kirov, Anil Sethy, Bryan L. Sorensen
  • Patent number: 7758721
    Abstract: 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, feeding the decompressed material from the decompression region into a fiberizing device, such as a low intensity disc refiner, where at least about 30 percent of the fiber bundles and fibers are axially separated, without substantial fibrillation of the fibers. In a more specific form the invention is directed to a process for producing mechanical pulp, including the steps of fiberizing wood chip feed material in a low intensity disc refiner until at least about 30 percent of the fibers are axially separated with less than about 5 percent fibrillation, and subsequently refining the fiberized material in a high intensity disc refiner until at least about 90 percent of the fibers are fibrillated.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: July 20, 2010
    Assignee: Andritz Inc.
    Inventor: Marc J. Sabourin
  • Patent number: 7758720
    Abstract: 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, feeding the decompressed material from the decompression region into a fiberizing device, such as a low intensity disc refiner, where at least about 30 percent of the fiber bundles and fibers are axially separated, without substantial fibrillation of the fibers. In a more specific form the invention is directed to a process for producing mechanical pulp, including the steps of fiberizing wood chip feed material in a low intensity disc refiner until at least about 30 percent of the fibers are axially separated with less than about 5 percent fibrillation, and subsequently refining the fiberized material in a high intensity disc refiner until at least about 90 percent of the fibers are fibrillated.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: July 20, 2010
    Assignee: Andritz Inc.
    Inventor: Marc J. Sabourin
  • Patent number: 7718034
    Abstract: A refiner steam separation system according to the present invention includes a blowline for transporting a mixture of fiber material from a refiner to an inlet of a steam separator. Waste steam is discharged from the separator through a waste steam outlet. Cleaned fiber material is discharged from the separator through an exit, which prevents a substantial portion of the waste steam from passing through the exit. A relay pipe communicates with the exit and a dryer duct, and transports cleaned fiber material therebetween. A resin input communicates with the relay pipe, and supplies resin therein. The resin is mixed with the cleaned fiber material prior to the cleaned fiber material being dried in the dryer duct. The present invention is also directed to a method of reducing VOC emissions generated during refining cellulosic fibrous material.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: May 18, 2010
    Assignee: Masonite Corporation
    Inventor: Dennis Henry Vaders
  • Patent number: 7713381
    Abstract: A system 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 diluting the destructured and dewatered chips to a consistency in the range of about 30 to 55 percent. The destructuring partially defibrates the material. This diluted material is fed to a rotating disc primary refiner wherein each of the opposed discs has an inner ring pattern of bars and grooves and an outer ring pattern of bars and grooves. The destructured and partially defibrated chips are substantially completely defibrated in the inner ring and the resulting fibers are fibrillated in the outer ring.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: May 11, 2010
    Assignee: Andritz Inc.
    Inventors: Marc J. Sabourin, Luc Gingras
  • Patent number: 7691235
    Abstract: Apparatus for separating steam from a mixture of steam and fibers is disclosed, comprising an elongated feeding compartment having an inlet and a feeding device for feeding a mixture through the inlet. The feeding device comprises a tubular section which is curved such that the mixture in the tubular section is separated under the influence of centrifugal forces in a heavy steam-less fraction of fibers in a outer layer and in a light fiber-free fraction of steam in a inner layer. The tubular section is arranged in such a way that a heavy fraction of fibers is fed through the inlet peripherally. The separated light fraction of steam is fed against the center of the compartment and removed through an outlet of the apparatus.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: April 6, 2010
    Assignee: Metso Paper, Inc.
    Inventor: Baltsar Lundgren
  • Publication number: 20090151880
    Abstract: A mechanical pulping method including: defibrating a comminuted cellulosic material; mechanically refining the defibrated cellulosic material in a primary refining step; introducing to the cellulosic material at least one of a chemical agent and a biological during the defibration step or the mechanical refining step, and producing pulp from the refined and defibrated cellulosic material.
    Type: Application
    Filed: October 24, 2008
    Publication date: June 18, 2009
    Applicant: ANDRITZ INC.
    Inventors: Johann Aichinger, Marc Sabourin, Jan Hill, Johann Grossalber
  • Publication number: 20090071616
    Abstract: This method of upgrading a biomass comprises: an upgrading step for performing upgrading treatment of a cellulose based biomass with an oxygen/carbon atomic ratio of at least 0.5, in presence of water and under a pressure of at least saturated water vapor pressure, and reducing said oxygen/carbon atomic ratio of said biomass to no more than 0.38, and a separation step for separating an upgraded reactant obtained from said upgrading step into a solid component and a liquid component.
    Type: Application
    Filed: November 3, 2008
    Publication date: March 19, 2009
    Applicants: JGC CORPORATION, The Tokyo Electric Power Company, Incorporated
    Inventors: Chiaki Suyama, Shinichi Tokuda, Masao Tsurui, Yoshinori Suto, Koji Tamura, Tsutomu Katagiri, Teruo Nagai, Jin Ogawa, Takeshi Yamaguchi
  • Publication number: 20080277082
    Abstract: A steam explosion pulping method including: impregnating a cellulosic biomass feed material in a pressurized reactor vessel; discharging the impregnated feed material from the vessel to a high pressure compressor; elevating a pressure of the feed material in the compressor; discharging the pressurized feed material from the compressor to a conduit coupled to a blow valve; rapidly reducing pressure of the pressurized feed material as the feed material passes through the blow valve, and pulping the feed material by expansion of fluid in the feed material during the rapid pressure reduction.
    Type: Application
    Filed: March 28, 2008
    Publication date: November 13, 2008
    Applicant: ANDRITZ INC.
    Inventors: Thomas Pschorn, Marc Sabourin, Peter Mraz
  • Patent number: 7381303
    Abstract: Thermomechanical pulp is an important process for producing fibrous mass used in papermaking. A two-level control strategy that stabilizes and optimizes the refining process has been developed. The Stabilization layer consists of a multivariable model predicative range controller that regulates the refiner line operations. The Quality Optimization layer provides the pulp quality control as measured by an online pulp quality (freeness, fibre length) sensor. This control startegy leverages the natural decoupling in the process. The modular design technique is able to handle multiple refiner lines that empty into a common latency chest. A global optimizer is also used to integrate and coordinate the two layers for enhanced constraint handling.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: June 3, 2008
    Assignee: Honeywell International Inc.
    Inventors: Manpreet S. Sidhu, Richard J. Van Fleet, Michel R. Dion
  • Publication number: 20080105392
    Abstract: This invention provides a composition and method for improving a mechanical pulping process by decreasing freeness and amount of shives, providing energy and chemical savings, and enhancing brightness and mechanical strength of a paper product made from a pulp material in the process. The composition includes formulations, such as surfactants, chelants, hydrotropes, reductive and oxidative pulp modifiers, and pH-controlling chemicals. The method includes selectively introducing these formulations to the pulp material in the mechanical pulping process.
    Type: Application
    Filed: November 3, 2006
    Publication date: May 8, 2008
    Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko
  • Patent number: 7368037
    Abstract: A refiner steam separation system according to the present invention includes a blowline for transporting a mixture of fiber material from a refiner to an inlet of a steam separator. Waste steam is discharged from the separator through a waste steam outlet. Cleaned fiber material is discharged from the separator through an exit, which prevents a substantial portion of the waste steam from passing through the exit. A relay pipe communicates with the exit and a dryer duct, and transports cleaned fiber material therebetween. A resin input communicates with the relay pipe, and supplies resin therein. The resin is mixed with the cleaned fiber material prior to the cleaned fiber material being dried in the dryer duct. The present invention is also directed to a method of reducing VOC emissions generated during refining cellulosic fibrous material.
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: May 6, 2008
    Assignee: Masonite Corporation
    Inventor: Dennis Henry Vaders
  • Patent number: 7303707
    Abstract: A method of processing lignocellulosic material includes the steps of comminuting the material to a size that it can be processed in a hydrothermal pressure vessel, drying the material in moving air to obtain a specific moisture content, packing the material into the vessel and subjecting the material within the vessel to steam under pressure, decompressing the vessel to return the temperature and pressure to ambient and drying the product to specific moisture content; the product so formed can be used for injection moulding or to form panel boards and the like.
    Type: Grant
    Filed: October 16, 2002
    Date of Patent: December 4, 2007
    Assignee: Lignotech Developments Limited
    Inventors: Karen Millicent Rafferty, legal representative, Andrew James Rafferty, deceased
  • Patent number: 7300540
    Abstract: 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 diluting the destructured and dewatered chips to a consistency in the range of about 30 to 55 percent. The destructuring partially defibrates the material. This diluted material is fed to a rotating disc primary refiner wherein each of the opposed discs has an inner ring pattern of bars and grooves and an outer ring pattern of bars and grooves. The destructured and partially defibrated chips are substantially completely defibrated in the inner ring and the resulting fibers are fibrillated in the outer ring.
    Type: Grant
    Filed: July 8, 2004
    Date of Patent: November 27, 2007
    Assignee: Andritz Inc.
    Inventors: Marc J. Sabourin, Luc Gingras
  • Patent number: 7300550
    Abstract: 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 band pattern of bars and grooves, such that substantially complete fiberization (defibration) of the chips is achieved in the inner band and the resulting fibers are fibrillated in the outer band. A pair of opposed co-operating refining plate elements for a flat disc refiner wherein the bars and grooves on each of the inner bands form an inner feed region followed by an outer working region, the bars and groove on each of the outer bands form an inner feed region followed by an outer working region, and the gap and/or material flow area formed when the plates are placed in front of each other increases between the inner working region and the outer feed region.
    Type: Grant
    Filed: December 10, 2004
    Date of Patent: November 27, 2007
    Assignee: Andritz Inc.
    Inventors: Marc J. Sabourin, Luc Gingras
  • Patent number: 7300541
    Abstract: 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, feeding the decompressed material from the decompression region into a fiberizing device, such as a low intensity disc refiner, where at least about 30 percent of the fiber bundles and fibers are axially separated, without substantial fibrillation of the fibers. Preferably, the fibers are axially separated with less than about 5 percent fibrillation, and subsequently the fiberized material is refined in a high intensity disc refiner until at least about 90 percent of the fibers are fibrillated. In another form the invention combines chip fiberizing with chemical treatments, for improving the pulp property versus energy relationships.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: November 27, 2007
    Assignee: Andritz Inc.
    Inventor: Marc J. Sabourin
  • Patent number: 7008505
    Abstract: In a new process for preparing pulped wood chips for paper making, chips from a hardwood such as eucalyptus are inoculated with aliving culture of one or more white rot fungi. The fungi propagate throughout the body of the wood chip, selectively attacking the lignin of the wood without harming the cellulosic fibers. Subsequent mechanical pulpting results in reduced utilization of energy, improved strength, and reduced cooking time.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: March 7, 2006
    Assignee: Biopulping International, Inc.
    Inventors: Masood Akhtar, Eric G. Horn, Michael J. Lentz, Ross E. Swaney
  • Patent number: 6899791
    Abstract: 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 fibers of the feed material. The pretreated wood chips are then converted to pulp using such methods as the ground wood pulping process or chemical digestion process.
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: May 31, 2005
    Assignee: Andritz Inc.
    Inventor: Marc J. Sabourin
  • Patent number: 6899790
    Abstract: A process for producing high bulk cellulosic fiber exhibiting a durable elevated curl index includes: (a) concurrently heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (b) recovering the pulp wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the heat treatment and convolving thereof. The curl imparted to the fiber persists upon treatment for 30 minutes in a laboratory disintegrator at 3000 rpm at 1% consistency at a temperature of 125° F. Moreover, the curl may be imparted to the fiber in a disk refiner at very short residence times, on the order of several seconds or less. In general, the process is carried out in the presence of saturated steam at a pressure of from about 5 to about 150 psig.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: May 31, 2005
    Assignee: Georgia-Pacific Corporation
    Inventor: Jeffrey A. Lee
  • Patent number: 6778936
    Abstract: A system (30) and method for determining stock consistency and for using consistency as a process variable to control some aspect of operation of a refiner (32) used to refine stock. The system includes at least one sensor (70 or 180) from which some refiner characteristic is obtained that is used by a processor (38) in determining consistency. The method uses the characteristic, such as temperature or pressure inside the refiner or in a refining zone (304) of the refiner, along with at least one other refiner parameter in determining consistency. A controller (274) uses the consistency determined in controlling some aspect of refiner operation. In one preferred controller, consistency is compared with a consistency setpoint and adjustments are made to try to converge consistency with the setpoint. The controller can be paused to accommodate other changes made to refiner operation and released when steady state refiner operation is achieved.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: August 17, 2004
    Assignee: J & L Fiber Services, Inc.
    Inventor: Ola M. Johansson
  • Publication number: 20040016524
    Abstract: A process for bleaching high bulk cellulosic fiber and producing a durable elevated curl index includes: (a) concurrently bleaching, heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency generally under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (b) recovering the pulp wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the heat treatment and convolving thereof. Preferably, the curl imparted to the fiber persists upon treatment for 30 minutes in a laboratory disintegrator at 3000 rpm at 1% consistency at a temperature of 125° F. Moreover, the curl may be imparted to the fiber in a disk refiner at very short residence times, on the order of several seconds or less.
    Type: Application
    Filed: July 23, 2003
    Publication date: January 29, 2004
    Inventor: Jeffrey A. Lee
  • Publication number: 20040011482
    Abstract: The invention relates to a method for avoiding and/or reducing the deposition of volatile and non-volatile wood components in gas-bearing systems, whereby at least one of the volatile wood components, at least partly, condenses in the gas-bearing system and the gas contains at least one compound with a similar condensation profile to the volatile wood component and which at least reduces the deposition of volatile wood components or the reaction products thereof. The invention further relates to a method for reducing and/or avoiding the deposition of wood components on machines and/or equipment components for the production of wood fiber materials from wood chippings, in which the shredding of the wood is achieved in the presence of a compound which forms a film on the surfaces of the above machines and/or equipment components and at least reduces the deposition of volatile wood components and/or the reaction products thereof.
    Type: Application
    Filed: October 4, 2002
    Publication date: January 22, 2004
    Inventors: Ingo Von Medvey, Thomas Rajcsanyi, Andreas Opalka, Joachim Werres
  • Patent number: 6673201
    Abstract: 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 said shaft provides a substantially fluid tight seal between said pack box and a side of said ring (in the digester) opposite the pack box.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: January 6, 2004
    Assignee: Andritz, Inc.
    Inventors: Keith P. Vogel, John F. Bolles, C. Bertil Stromberg
  • Patent number: 6673211
    Abstract: An apparatus for loading fibers in a fiber suspension with calcium carbonate has a housing with an inlet and an accept outlet. A rotatable distribution member is positioned within the housing. A rotor and stator assembly is positioned within the housing radially outside of the distribution member. A toothed ring is interposed between the distribution rotor and the rotor and stator assembly. The toothed ring and the rotor and stator assembly define a gas ring therebetween. A reactant gas supply is fluidly coupled with the gas ring.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: January 6, 2004
    Assignee: Voith Paper Patent GmbH
    Inventor: Klaus Doelle
  • Patent number: 6627041
    Abstract: A process for bleaching high bulk cellulosic fiber and producing a durable elevated curl index includes: (a) concurrently bleaching, heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency generally under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (b) recovering the pulp wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the heat treatment and convolving thereof. Preferably, the curl imparted to the fiber persists upon treatment for 30 minutes in a laboratory disintegrator at 3000 rpm at 1% consistency at a temperature of 125° F. Moreover, the curl may be imparted to the fiber in a disk refiner at very short residence times, on the order of several seconds or less.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: September 30, 2003
    Assignee: Georgia-Pacific Corporation
    Inventor: Jeffrey A. Lee
  • Publication number: 20030041965
    Abstract: Fibers of annual plants e.g. straw for use in forming composite products are improved by hydrothermal treatment at 40° to 120 ° C. with or followed by high shear treatment. The process enables the use of annual plant fibrous materials not hitherto usable successfully.
    Type: Application
    Filed: November 30, 2001
    Publication date: March 6, 2003
    Applicant: MARLIT LTD.
    Inventors: Efthalia Vergopoulou Markessini, Pavlos Mouratidis, Edmone Roffael, Luc Rigal
  • Patent number: 6464826
    Abstract: Method is disclosed for treating wood chips including a heater for preheating the wood chips in the presence of steam, a beater to mechanically process the wood chips into wood fibers, a cyclone for separating the wood fibers from steam and volatile organic substances produced in the beater, a blower line for transporting the wood fibers, steam and volatile organic substances from the beater to the inlet of the cyclone, a drying conduit connected to the lower outlet of the cyclone for carrying wood fibers therefrom, a sluice valve associated with the lower outlet of the cyclone for controlling the removal of the wood fibers from the cyclone, and a processing conduit connected to the upper outlet of the cyclone for the steam and the volatile organic substances whereby the volatile organic substances separated in the cyclone can be separated and heat associated with the steam separated in the cyclone can be recovered.
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: October 15, 2002
    Assignee: Valmet Fibertech AB
    Inventors: Christer Säfström, Carl-Johan Söderberg, Göran Lundgren
  • Publication number: 20020112826
    Abstract: A method and a dispersing machine for hot dispersing a highly consistent fibrous stock. The machine includes at least one stationary stator that includes a plurality of annular concentric rows of stator teeth. At least one rotating rotor is provided that includes a plurality of annular concentric rows of rotor teeth. An annular dispersing zone is formed by the stator teeth and the rotor teeth whereby the rotor teeth are adapted to rotate adjacent the stator teeth such that a distance is maintained between the stator teeth and the rotor teeth in the annular dispersion zone. An inlet is provided that allows the fibrous stock to enter the dispersion machine. A milling element is centrally arranged on the rotor. The milling element is arranged near the inlet and defines a milling zone. An annular chamber is arranged between the dispersion zone and the milling zone. At least one conduit allows a heating medium to enter the annular chamber.
    Type: Application
    Filed: January 18, 2002
    Publication date: August 22, 2002
    Applicant: VOITH PAPER PATENT GmbH
    Inventors: Almut Kriebel, Volker Niggl, Josef Schneid, Hans Schnell
  • Patent number: 6364998
    Abstract: 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 accomplished in one embodiment, where the primary refining is performed in a first disc refiner and the secondary refining is performed in a distinct second disc refiner. In a particularly cost-effective second embodiment the primary and secondary refining are performed within a single refining machine having distinct primary and secondary refining zones which are fluidly connected in series.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: April 2, 2002
    Assignee: Andritz Inc.
    Inventor: Marc J. Sabourin
  • Patent number: 6364997
    Abstract: The invention relates to a imaging element comprising a paper having a surface roughness average of between 0.13 and 0.44 micrometers.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: April 2, 2002
    Assignee: Eastman Kodak Company
    Inventors: Sandra J. Dagan, Thaddeus S. Gula, Robert P. Bourdelais, Peter T. Aylward
  • Patent number: 6346165
    Abstract: A method for improving the bondability of annual plant materials to a formaldehyde-based resin including the steps of: (a) providing a straw plant material having a plurality of fibers with each of the fibers surrounded by a waxy and silica layer; (b) extruding the straw plant material in a twin screw extruder while simultaneously subjecting the straw plant material to a thermal treatment with an aqueous solution containing a lignin modifying agent or steam, the thermal treatment being conducted at a temperature between about 40° C. and 120° C., the extruding subjecting the straw plant material to a sufficiently high shear force such that the extruding with simultaneous thermal treatment achieves a substantial defibration of the straw plant material with destruction of the waxy and silica layer and formation of individual fibers and (c) subjecting the treated material to heat and pressure in the presence of the formaldehyde-based resin to form a resin-bonded fiberboard or particleboard.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: February 12, 2002
    Assignee: Marlit Ltd.
    Inventors: Efthalia Vergopoulou Markessini, Pavlos Mouratidis, Edmone Roffael, Luc Rigal
  • Publication number: 20020011317
    Abstract: A process for bleaching high bulk cellulosic fiber and producing a durable elevated curl index includes: (a) concurrently bleaching, heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency generally under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (b) recovering the pulp wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the heat treatment and convolving thereof. Preferably, the curl imparted to the fiber persists upon treatment for 30 minutes in a laboratory disintegrator at 3000 rpm at 1% consistency at a temperature of 125° F. Moreover, the curl may be imparted to the fiber in a disk refiner at very short residence times, on the order of several seconds or less.
    Type: Application
    Filed: February 27, 2001
    Publication date: January 31, 2002
    Inventor: Jeffrey A. Lee
  • Patent number: 6200417
    Abstract: Process and device for the mixing of suspensions with possibly different natures and/or compositions in the stable section of a paper machine. In the process, a suspension, particularly of the backwater of the paper machine, is piped in a mixing tube with the main flow direction in the longitudinal direction of the tube, and additional suspensions, with possibly different solid content, are injected. In the device, a mixing device and piping carry the suspension in the stable section of a paper or cardboard machine and blend suspensions with a higher solid content into a first suspension with little or no solid content. The mixing device and piping include a tube, at least one inlet for the first suspension, a plurality of feeds for the higher solid content suspensions to be admixed, and one outlet for the blended suspension, with a new solid content, arranged downstream from a bend in the tube.
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: March 13, 2001
    Assignee: Voith Sulzer Papiertechnik Patent GmbH
    Inventors: Erwin Binder, Karl-Heinz Beuermann
  • Patent number: 6165317
    Abstract: A method for refining lignocellulose-containing material into pulp in a disc refiner comprises preheating the material to a temperature greater than the glass transition temperature of lignin in the material, and holding this temperature for under one minute. The heated material is then subject to high speed refining in a disc refiner to produce pulp. The resulting pulp may then be subject to secondary refining steps to produce paper quality pulp. The preheat retention time is preferably in the range of 5-30 seconds, and can be controlled as a process variable to optimize energy savings, pulp strength, and optical qualities. High quality pulp can be obtained with preheat at high temperature and low retention time, followed by primary refining at disc speed of at least 2300 rpm.
    Type: Grant
    Filed: July 1, 1998
    Date of Patent: December 26, 2000
    Assignee: Andritz Sprout-Bauer, Inc.
    Inventor: Marc J. Sabourin
  • Patent number: 6073865
    Abstract: A process is disclosed that is utilized in particular in the preparation of fibrous material of used paper. Hot fibrous pulp friable materials, which are especially suitable for dispersing, are first formed in a compact, high-consistency fibrous material in the form of a plug. In a preferred embodiment, the plug of materials is pushed against a rotor that is equipped with pulverization elements. The pulverization elements remove the fibrous pulp friable materials and distribute them in a disintegrated condition in a processing chamber. In the processing chamber, super-heated vapor is supplied via vapor supply lines, which calefies the fibrous pulp friable materials, for example, by condensation.
    Type: Grant
    Filed: March 24, 1998
    Date of Patent: June 13, 2000
    Assignee: Voith Sulzer Papiertechnik Patent GmbH
    Inventors: Almut Kriebel, Volker Niggl, Erich Peters, Josef Schneid, Hans Schnell