With Additional Chemical Treatment Before Start Of Defibration Patents (Class 162/25)
  • Patent number: 10513824
    Abstract: The invention relates to a method for reducing pulp viscosity in production of dissolving pulp. The method comprises producing cellulose pulp, whereby the obtained cellulose pulp has a cellulose content of at least 90%, and bleaching the obtained cellulose pulp. The cellulose pulp is treated after bleaching with performic acid.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: December 24, 2019
    Assignee: Kemira Oyj
    Inventors: Leif Robertson, Veli-Matti Vuorenpalo, Jonas Konn, Kaisa Kaski
  • Patent number: 9453302
    Abstract: Disclosed is a modified refiner system for the acetylation of wood chip and/or wood fiber. The invention comprises a process for the acetylation of wood chip in a refiner system including a feed hopper component, a non-steam digester component and a refiner (defibrator) component in which the chip is contacted with an acetylating fluid between the hopper and the digester components within a connecting multi-zone compression feed screw.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: September 27, 2016
    Assignee: Titan Wood Limited
    Inventor: Benjamin Painter
  • Patent number: 9399835
    Abstract: A method to make pulp adapted for forming a corrugated medium, the method includes: cooking chips in a cooking vessel using a caustic carbonated pulping soda/caustic (SC) cooking liquor injected into the cooking vessel; fiberizing the chips discharged from the cooking vessel to form a pulp, and removing lignin from the pulp or oxidizing lignin in the pulp by injecting oxygen (O2) into the fiberized pulp.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: July 26, 2016
    Assignee: Packaging Corporation of America
    Inventors: Ventzislav H. Kirov, Namhee Shin
  • Patent number: 8961740
    Abstract: A method to make pulp adapted for forming a corrugated medium, the method includes: cooking chips in a cooking vessel using a caustic carbonated pulping soda/caustic (SC) cooking liquor injected into the cooking vessel; fiberizing the chips discharged from the cooking vessel to form a pulp, and removing lignin from the pulp or oxidizing lignin in the pulp by injecting oxygen (O2) into the fiberized pulp.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: February 24, 2015
    Assignee: Packaging Corporation of America
    Inventors: Ventzislav H. Kirov, Namhee Shin
  • Patent number: 8945347
    Abstract: A method of producing hardwood pulp is provided. This method comprises treating hardwood chips with one or more than one Family 11 xylanase enzyme in the absence of adding an oxidizing enzyme for about 5 minutes to about 120 minutes, to produce a treated chip mixture. The treated chip mixture is then mechanically refined to produce the hardwood pulp.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: February 3, 2015
    Assignee: Centre Technique de l'Industrie des Papiers, Cartons et Celluloses
    Inventors: Michel Petit-Conil, J. Mark A. Hoddenbagh, Jeffrey S. Tolan
  • Patent number: 8865318
    Abstract: A composite wood product containing acetylated wood elements characterized by an average value in thickness swelling not exceeding 5% after subjection to 25 wet-dry/freeze-thaw cycles as described in Table II. Alternative characterizations include moduli of elasticity and rupture, and bending strength. A two stage process for the acetylation of wood elements is also described.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: October 21, 2014
    Assignee: Titan Wood Limited
    Inventors: Michel Maes, Beno Pol
  • Patent number: 8778134
    Abstract: A process for treating cellulosic fibers comprises mechanically pre-treating the fibers followed by treating the fibers with an enzyme and thereafter mixing the fibers with a solution comprising an alkali metal hydroxide followed by mechanically treating the fibers to form microfibrillated cellulose. In this way it is possible to produce microfibrillated cellulose (MFC) in an improved and energy efficient way.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: July 15, 2014
    Assignee: Stora Enso OYJ
    Inventors: Marianna Vehvilainen, Taina Kamppuri, Maarit Peltola, Ali Harlin, Pertti Nousiainen
  • Patent number: 8764936
    Abstract: Method for the production of mechanical or chemi-mechanical pulp as raw material for paper or cardboard. According to this method, the pulp is fibrillated and the fibrillated pulp is bleached in alkaline conditions. According to the present invention, the pulp is screened to separate the reject from the accept, at maximum approximately 60% of the total amount of pulp is separated as the reject, the reject is bleached separate from the accept, and, after that, the bleached reject is remixed with the accept. When operating according to the present invention, the strength of the pulp increases and the energy used for refining is reduced, which is seen both in the refining of the reject and in the post-refining of the final mechanical pulp.
    Type: Grant
    Filed: May 3, 2006
    Date of Patent: July 1, 2014
    Assignee: M-real Oyj
    Inventors: Auli Laurila-Lumme, Markku Leskelä, Kristiina Manninen, Ole Nickull, Isto Nikamaa, Marko Pekkola, Maija Pitkänen, Pirita Suortamo, Kai E. J. Vikman
  • 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: 8747612
    Abstract: The present invention relates to a process for the production of microfibrillated cellulose wherein the process comprises the steps of, providing a slurry comprising fibers, adding the slurry to an extruder, treating the slurry in the extruder so that the fibers are defibrillated and microfibrillated cellulose is formed. The invention further relates to a microfibrillated cellulose produced.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: June 10, 2014
    Assignee: Stora Enso OYJ
    Inventors: Isto Heiskanen, Ali Harlin, Kaj Backfolk, Risto Laitinen
  • Publication number: 20140083633
    Abstract: The present disclosure relates to a system and process in which pulp is produced using a chemical mechanical pulping process, during which lignocellulosic material undergoes fiberization without chemical impregnation. Chemical treatment of the lignocellulosic material is performed during or after fiberization of the material to become fiber bundles.
    Type: Application
    Filed: September 27, 2013
    Publication date: March 27, 2014
    Applicant: ANDRITZ INC.
    Inventor: Eric XU
  • Patent number: 8658405
    Abstract: Disclosed are a method of hydrolysis of wet fiber and a method for preparing ethanol. Generally, an agricultural plant material, such as corn hulls, distiller's dried grains, or spent germ, is treated to at least partially hydrolyze the fiber. The process may include a maceration step followed by a shearing operation in the presence of steam to yield a treated product, in which, in many embodiments, saccharides will be released and unbound from fibrous portions of the agricultural product. In some embodiments, the process includes macerating the material to provide a slurry having a solids content of at least 10 percent and jet cooking the slurry. A mixture of saccharides prepared in this fashion may be fermented to yield ethanol and/or biochemicals.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: February 25, 2014
    Assignee: Grain Processing Corporation
    Inventors: Sarjit Johal, Steven L. Ramsden, Zachary J. Halloran, Albert J. Pollmeier
  • Patent number: 8647468
    Abstract: A process for treating cellulosic fibers comprising pre-treating the fibers with an enzyme in a first enzymatic treatment followed by mechanical pre-treating the fibers in a first mechanical treatment and a second enzymatic treatment followed by a second mechanical treatment of the fibers to form micofibrillated cellulose. In this way it is possible to produce mircofibrillated cellulose (MFC) in an improved and energy efficient way.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: February 11, 2014
    Assignee: Stora Enso OYJ
    Inventors: Isto Heiskanen, Kaj Backfolk, Marianna Vehviläinen, Taina Kamppuri, Pertti Nousiainen
  • Publication number: 20130126109
    Abstract: A method for bleaching pulp includes introducing a bleaching liquor in at least one refiner to contact lignocellulosic particulates processed therein in the formation of pulp, wherein the bleaching liquor includes at least one peroxide, magnesium sulfate, caustic hydroxide, at least one chelating agent, and less than 0.1%, or less than 0.01%, or less than 0.001% by weight silicate based on dry weight of the lignocellulosic particulates. Magnesium perhydroxide is generated in situ in the refining system with bleaching of the particulates during refining and reduced scale occurs by use of the silicate or essentially silicate free conditions. A free or essentially silicate-free bleaching liquor which can provide highly brightened pulps also is described.
    Type: Application
    Filed: September 26, 2012
    Publication date: May 23, 2013
    Applicant: BUCKMAN LABORATORIES INTERNATIONAL, INC.
    Inventor: Buckman Laboratories International, Inc.
  • Patent number: 8282773
    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: Grant
    Filed: October 24, 2008
    Date of Patent: October 9, 2012
    Assignee: Andritz Inc.
    Inventors: Johann Aichinger, Marc Sabourin, Jan Hill, Johann Grossalber
  • Patent number: 8262851
    Abstract: A non-compression vessel, such as a digester, is employed for the chemical preconditioning of the chips followed by a fiberizing device to break the preconditioned chips down to fiber bundles, which are then washed before a high consistency chemical treatment. The digester may be one such as used in conventional chemical pulping of wood with or without screens for the extraction of chemical. If extracted this chemical could be recirculated to the digester with treatment in the circulation loop such as heating or the addition of dilution or other chemicals. This digester may be hydraulic or vapor phase (that is contain a vapor space within the digester), and operate in either a continuous or batch fashion. This digester allows for the discharge of material without the use of a screw mechanism. The digester treated material is then defiberized to convert the chips into course fiber bundles, which then is washed and dewatered.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: September 11, 2012
    Assignee: Andritz Inc.
    Inventors: Johann Aichinger, Eric Xu, Marc J. Sabourin
  • Patent number: 8262852
    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: Grant
    Filed: July 8, 2010
    Date of Patent: September 11, 2012
    Assignee: Nalco Company
    Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko
  • Patent number: 8216423
    Abstract: The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applying chemicals such as alkaline peroxide at the primary refiner. This is implemented in the preferred embodiment, by pre-treating feed material, refining the materials into a pulp in a superatmospheric refiner, and adding chemicals in the post refining blowline.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: July 10, 2012
    Assignee: Andritz Inc.
    Inventor: Eric Chao Xu
  • Patent number: 8048263
    Abstract: A process for applying chemicals, such as an alkaline peroxide pretreatment (1) to lignocellulosic material before chemical refining and at the primary refiner (3). The preferred embodiment comprises (i) preconditioning at temperatures below 95° C., especially below 80° C., (ii) limiting the time and/or temperature in the refiner, (iii) reaction quench to maintain temperatures below 80° C., and (iv) subsequent high consistency bleaching (4).
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: November 1, 2011
    Assignee: Andritz Inc.
    Inventors: Martin Herkel, Thomas Pschorn, Eric Chao Xu
  • Patent number: 7981247
    Abstract: The present invention relates to processes for enhancing a refiner's production rate and/or reducing the specific energy consumption for a freeness target through the use of lubricant(s) or carrier(s)/frictionizer(s), respectively.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: July 19, 2011
    Assignee: Hercules Incorporated
    Inventors: Eric Oswaldo Fernandez, Mark Edward Laurint
  • Patent number: 7892397
    Abstract: A process for producing dissolving pulp includes a degumming step using a degumming liquor which includes hydrogen peroxide and ammonia.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: February 22, 2011
    Assignee: Alberta Innovates - Technology Futures
    Inventors: Keith Luo, Wade Chute
  • Publication number: 20100263815
    Abstract: The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applying chemicals such as alkaline peroxide at the primary refiner. This is implemented in the preferred embodiment, by pre-treating feed material, refining the materials into a pulp in a superatmospheric refiner, and adding chemicals in the post refining blowline.
    Type: Application
    Filed: March 26, 2010
    Publication date: October 21, 2010
    Inventor: Eric Chao Xu
  • Patent number: 7736463
    Abstract: A method of manufacturing bleached mechanical and chemithermomechanical pulp is provided, having enhanced bleaching effect, wherein lignocellulose material is passed through at least one preheater or through a chemical treatment system, a steam separator and a refiner where the lignocellulose material is converted into a pulp suspension which, after steam separation, is passed at least to a storage vessel and to a screening department, from which the major part of the pulp suspension is separated as a substantially finished product or is separated and further treated. The reductive bleaching agent is added to the advancing pulp suspension without a bleaching tower. The method is characterized by adding the bleaching agent at a location downstream of the refiner and upstream of the screening department, and by bleaching the pulp under drastic conditions of temperature and minimized oxygen access at the location and immediately downstream of the location.
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: June 15, 2010
    Assignee: Holmen Aktiebolag
    Inventors: Eric Yijing Zhang, Micael Axelfelt, Sverker Bengtsson, Charlotte Wancke Stahl, Johanna Magnusson
  • Patent number: 7497924
    Abstract: The present invention relates to the production of texturized microcrystalline cellulose from raw pulp material. This texturized microcrystalline cellulose can then be used for surface treatment of paper or paper board. Additionally, the texturized microcrystalline cellulose may be used as a starting material for production of paper or paper board.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: March 3, 2009
    Assignee: International Paper Company
    Inventors: Xuan Truong Nguyen, Zheng Tan
  • Publication number: 20080210391
    Abstract: The present invention serves for loading a pulp suspension (S) with calcium carbonate. Liquid calcium hydroxide as milk of lime (7) is added during or before the pulp operation (1) carried out to form the pulp. By introducing gaseous carbon dioxide (8) into the pulp suspension thus treated, a chemical reaction is triggered therein, in which the finely divided calcium carbonate is precipitated. The present invention is particularly economic and effective due to the early addition of calcium oxide or calcium hydroxide.
    Type: Application
    Filed: January 7, 2008
    Publication date: September 4, 2008
    Inventors: Lothar Pfalzer, Klaus Dolle
  • Patent number: 7384502
    Abstract: Wood chips having low bleachability are impregnated with a chemical liquor at a pH range of 7-12 in aqueous solution and the chemical liquor from the impregnated chips is drained, whereby extractives contained in the chips and consuming bleaching agents can be removed to improve the effect of bleaching agents in a subsequent bleaching step. Bleached mechanical pulp is prepared by defibration by primary refining—bleaching—beating by secondary refining wherein pulp fibers are washed after defibrating wood chips having low bleachability and before bleaching the pulp fibers, whereby the amount of bleaching agents used can be reduced and bleached mechanical pulp having a Hunter brightness of 45-65% after secondary refining can be obtained.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: June 10, 2008
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Yasuyuki Kamijo, Isao Onodera, Keigo Watanabe, Takanori Miyanishi
  • Patent number: 7306698
    Abstract: The present invention is a method for producing pulp from fibrous lignocellulose material using a treatment step which exposes the material to oxalic acid, or oxalic acid and sodium bisulfite, prior to pulping. The pulping of the resulting product requires less energy input and provides a pulp having enhanced physical properties as compared to untreated materials.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: December 11, 2007
    Assignees: Biopulping International, Wisconsin Alumni Research Foundation
    Inventors: Masood Akhtar, Ross E. Swaney, Eric G. Horn, Michael J. Lentz, Gary M. Scott, Cory C. Black, Carl J Houtman, T. K. Kirk
  • Patent number: 7294227
    Abstract: A system for treating pulp comprises a dewatering device (2) for dewatering the pulp to a fiber concentration of at least 20%, a closed pulp-shredding vessel (16) for shredding the dewatered pulp, and an outlet pipe (22) from the pulp-shredding vessel. A transport screw (18) is arranged in the outlet pipe for transporting the shredded pulp from the pulp-shredding vessel through the outlet pipe through a reactor vessel (6) for bleaching the shredded pulp through reaction with ozone gas. The outlet pipe (22) is designed with a heightened roof portion (27), so that an upper gas space (29) free from pulp is formed in the outlet pipe between the roof portion and the transport screw. A flow-restraining member in the form of a partition wall (31) is arranged in the upper gas space in the outlet pipe for restraining the gas flow through the gas space, whereby the pumping action of the transport screw in the outlet pipe is decreased.
    Type: Grant
    Filed: December 4, 2002
    Date of Patent: November 13, 2007
    Assignee: Metso Paper, Inc.
    Inventors: Monica Bokström, Per Åström
  • Patent number: 7229525
    Abstract: A method to enhance brightness in Chemical and Mechanical pulps comprising adding an organic sulfide chelant is described and claimed. A method to enhance delignification in a Chemical pulp comprising adding an organic sulfide chelant is also described and claimed.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: June 12, 2007
    Assignee: Nalco Company
    Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko, Kristine S. Salmen
  • Patent number: 7182836
    Abstract: The invention relates to a method for delignifying lignocellulosic raw materials by using sulfites in the presence of an alkaline component, especially sodium hydroxide or sodium carbonate or a mixture thereof in an aqueous solution at a high temperature and high pressure. The invention is characterized in that a first partial fragment of the alkaline component is added when the aqueous solution starts to decompose and in that at least a second partial fragment of the alkaline component is added only when delignification begins.
    Type: Grant
    Filed: July 1, 2002
    Date of Patent: February 27, 2007
    Assignee: Voith Paper Fiber Systems GmbH KG
    Inventors: Rudolf Patt, Othar Kordsachia, Bjorn Rose
  • Patent number: 7037405
    Abstract: The present invention relates to the production of texturized microcrystalline cellulose from raw pulp material. This texturized microcrystalline cellulose can then be used for surface treatment of paper or paper board. Additionally, the texturized microcrystalline cellulose may be used as a starting material for production of paper or paper board.
    Type: Grant
    Filed: May 14, 2003
    Date of Patent: May 2, 2006
    Assignee: International Paper Company
    Inventors: Xuan Truong Nguyen, Zheng Tan
  • Patent number: 7018509
    Abstract: This invention relates to an improved process for manufacturing bleached thermomechanical aspen pulp having reduced yellow after treatment with aluminum based chemicals such as alum which are used in paper making processes. In this improved process the pulp is washed prior to, after or between the bleaching stages or a combination of the foregoing.
    Type: Grant
    Filed: August 31, 2002
    Date of Patent: March 28, 2006
    Assignee: International Paper Co.
    Inventors: Robin R. Kilgannon, Robert J. Kane, Eileen M. Joy, Anil K. Dewan
  • 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: 7005034
    Abstract: A method in connection with the production of mechanical pulp from a cellulose containing material wherein the material is processed in at least one refining step to produce pulp. According to the invention, the pulp is fractionated (4), after a first refining step (1), in order to separate primary fines (5) from the pulp. The invention also relates to a mechanical pulp, produced by the method, and to a paperboard, which at least partly consists of such mechanical pulp.
    Type: Grant
    Filed: September 6, 2000
    Date of Patent: February 28, 2006
    Inventors: Anders Moberg, Frank Peng, Mats Fredlund
  • Publication number: 20040238133
    Abstract: A process for refining lignocellulose raw materials, especially wood chips, saw dust, annual plants or wood waste, includes dewatering the lignocellulose raw materials discharged from a digester, extracting condensate produced during dewatering, and refining the dewatered lignocellulose raw materials in a refiner.
    Type: Application
    Filed: March 11, 2004
    Publication date: December 2, 2004
    Inventors: Wolfgang Lashofer, Michael Frint
  • Publication number: 20040231811
    Abstract: There is a need for a cheaper method of producing bleached TMP and CTMP without impairing the properties of the pulp.
    Type: Application
    Filed: June 21, 2004
    Publication date: November 25, 2004
    Inventors: Per Engstrand, Christer Sandberg, Charlotte Wancke-Stahl, Jonas Jonsson, Goran Starck, Mikael Wahlgren
  • Publication number: 20040226671
    Abstract: The present invention relates to the production of texturized microcrystalline cellulose from raw pulp material. This texturized microcrystalline cellulose can then be used for surface treatment of paper or paper board. Additionally, the texturized microcrystalline cellulose may be used as a starting material for production of paper or paper board.
    Type: Application
    Filed: May 14, 2003
    Publication date: November 18, 2004
    Inventors: Xuan Truong Nguyen, Zheng Tan
  • Publication number: 20040216854
    Abstract: Composite panels and pulp, and paper products of the pulp, are produced from Arundo donax. In the fabrication of the composite panels, Arundo donax is comminuted to a suitable size, combined with a binder, and consolidated into panels that meet standards for construction and/or furniture grade panels. The Arundo donax particulates may be combined with wood particulates to produce a mixed furnish that can be used in the preparation of composite panels. Comminuted Arundo donax is treated, in conventional pulping processes, to produce a high tensile strength pulp that can be used in the production of paper. The pulp has a lighter color than wood pulp, and thereby uses less bleaching chemicals to achieve a desired whiteness. The pulp can be combined with wood pulp to produce a variety of products.
    Type: Application
    Filed: May 26, 2004
    Publication date: November 4, 2004
    Applicants: Nile Fiber Pulp & Paper, Inc., Washington State University Research Foundation
    Inventors: Ernett Altheimer, Michael P. Wolcott
  • Publication number: 20040200586
    Abstract: A process for applying chemicals, such as an alkaline peroxide pretreatment (1) to lignocellulosic material before chemical refining and at the primary refiner (3). The preferred embodiment comprises (i) preconditioning at temperatures below 95° C., especially below 80° C., (ii) limiting the time and/or temperature in the refiner, (iii) reaction quench to maintain temperatures below 80° C., and (iv) subsequent high consistency bleaching (4).
    Type: Application
    Filed: January 13, 2004
    Publication date: October 14, 2004
    Inventor: Martin Herkel
  • Publication number: 20040154762
    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: Application
    Filed: November 26, 2003
    Publication date: August 12, 2004
    Inventors: Masood Akhtar, Eric G Horn, Michael J Lentz, Ross E Swaney
  • Patent number: 6761798
    Abstract: Composite panels and pulp, and paper products of the pulp, are produced from Arundo donax. In the fabrication of the composite panels, Arundo donax is comminuted to a suitable size, combined with a binder, and consolidated into panels that meet standards for construction and/or furniture grade panels. The Arundo donax particulates may be combined with wood particulates to produce a mixed furnish that can be used in the preparation of composite panels. Comminuted Arundo donax is treated, in conventional pulping processes, to produce a high tensile strength pulp that can be used in the production of paper. The pulp has a lighter color than wood pulp, and thereby uses less bleaching chemicals to achieve a desired whiteness. The pulp can be combined with wood pulp to produce a variety of products.
    Type: Grant
    Filed: December 15, 2000
    Date of Patent: July 13, 2004
    Assignee: Nile Fiber Pulp & Paper, Inc.
    Inventors: Ernett Altheimer, Michael P. Wolcott
  • Publication number: 20040118529
    Abstract: The present invention aims firstly to provide a novel technique capable of preparing bleached pulp having high brightness from materials having low bleachability containing high levels of extractives and secondly to provide a technique capable of reducing the amount of bleaching agents used in processes for preparing bleached mechanical pulps.
    Type: Application
    Filed: December 9, 2003
    Publication date: June 24, 2004
    Inventors: Yasuyuki Kamijo, Isao Onodera, Keigo Watanabe, Takanori Miyanishi
  • Patent number: 6632326
    Abstract: The present invention's modifying method for wood elements includes a step for soaking wood elements in one or a mixture of acetic anhydride, acetic acid, or chloroacetic acid; and a step for acetylating the impregnated wood elements in a gaseous phase. This method makes it possible to reduce the time required for the step of acetylating the wood elements, simplifies the process, reduces fabrication costs, and enables fabrication of a wood fiberboard having high dimensional stability.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: October 14, 2003
    Assignee: Yamaha Corporation
    Inventors: Yoshihiro Hirano, Ritsuo Iwata, Hiroshige Murakami
  • Publication number: 20030116289
    Abstract: The present invention comprises an improved method for refining cellulose that produces a highly refined cellulosic material. The method comprises soaking raw material in a mild NaOH using reduced temperatures and pressures, and refining the material with a plate refiner so that a waste water stream is reduced in volume and has a pH within a range of 8 to 9. The present invention also comprises a HRC gel having a lignin concentration of at least about one (1)% by weight, and a water retention capacity of about 25 to at least about 56 g H2O/g dry HRC.
    Type: Application
    Filed: November 25, 2002
    Publication date: June 26, 2003
    Applicant: Regents of the University of Minnesota
    Inventors: Brock Lundberg, Lin Gu, Rongsheng Roger Ruan, Ling Chen, Paul Bradley Addis, Jack Edgar Johnson
  • Publication number: 20030111193
    Abstract: A method of modifying a two-dimensional, flat fiber morphology of a never-been-dried wood pulp into a three-dimensional twisted fiber morphology without the aid of a chemical cross-linker. The method includes the steps of treating a never-been-dried wood pulp fiber slurry with a drying aid and thermally drying the wood pulp fiber slurry. The method may alternatively, or additionally, include the steps of spray drying a wood pulp fiber slurry and/or a slurry of a hydrophilic material, and flash drying the spray dried wood pulp fiber slurry and/or slurry of hydrophilic material.
    Type: Application
    Filed: December 18, 2001
    Publication date: June 19, 2003
    Inventors: Young Chan Ko, Sheng-Hsin Hu, Kambiz B. Makoui
  • Publication number: 20030041983
    Abstract: A cellulose fiber having extended biostability and the method of its manufacture are described. While prior treatments of cellulose with biotoxic metal compounds have given improved resistance to decay, these treatments have not been entirely satisfactory where the fiber had to be refined before use. Refining energy was very high and fiber length loss was substantial. Treatment of cellulose fiber with didecyldimethylammonium chloride (DDAC) or bromide (DDAB), these materials in combination with low levels of copper, or low levels of copper alone, has given a product with very good biostability without a major increase in refining energy or loss of fiber length. The treated fiber is particularly advantageous as a reinforcing component for cement board products.
    Type: Application
    Filed: August 27, 2002
    Publication date: March 6, 2003
    Applicant: Weyerhaeuser Company
    Inventors: Richard A. Jewell, Julie A. Reimer
  • Patent number: 6419786
    Abstract: A method of treating wood-fiber pump, particularly wood-fiber pulp that contains recycled paper, comprises delivering the pulp to and advancing the pulp in a heating zone while delivering steam to the heating zone. The pulp is finely-divided in a disperser and the finely-divided pulp delivered to a screw press without separate departure of steam, so as to compact the pulp in the end of the screw press and therewith form a plug seal. At the same time, one or more bleaching chemicals is or are supplied during one or more treatment stages, and the temperature of the pulp is regulated to obtain an optimal bleaching process or optimal bleaching processes. The temperature of the pulp can be raised or lowered by supplying steam or water thereto respectively. The invention also relates to a plant for carrying out the method.
    Type: Grant
    Filed: April 12, 1999
    Date of Patent: July 16, 2002
    Assignee: Cellwood Machinery AB
    Inventor: Rolf Kurtz
  • Patent number: 6409841
    Abstract: Disclosed are processes and systems for the production of useful organic product from diverse lignocellulose-containing biomass having increased yield and efficiency over existing processes. In particular, the present invention integrates dilute acid hydrolysis and alkaline delignification techniques in processes that enhance the efficiency and yiel of lignocellulostic biomass processing and enable the economic production lignin-based biodegradable plastics and other useful organic products.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: June 25, 2002
    Assignee: Waste Energy Integrated Systems, LLC.
    Inventor: Charles K. Lombard
  • Publication number: 20020069982
    Abstract: A process for producing paper and absorbent products of increased strength includes extracting wood particulates with a solvent selected from methanol, ethanol, and acetone at a pressure less than 50 psi to reduce the pitch and volatile organic compounds of the particulates without significant dissolution of lignin and cellulosic components. The wood particulates are pulped to produce a pulp with reduced pitch content. A slurry is prepared from the pulp and used to form paper products.
    Type: Application
    Filed: November 6, 2001
    Publication date: June 13, 2002
    Applicant: Weyerhaeuser Company
    Inventors: Jerry R. Speaks, Roger O. Campbell, Michael A. Veal
  • Publication number: 20020069981
    Abstract: A chemical wood pulping process having reduced volatile organic compound emissions includes extracting wood particulates with solvent at a pressure less than 50 psi to reduce naturally-occurring particulate pitch and volatile organic compound content without significant dissolution of lignin and wood cellulosic components. The solvent used is methanol, ethanol, or acetone. This is followed by comingling the extracted wood particulates with a liquor having chemical reactants, not including the solvent used to extract the wood particulates, for solubilizing lignin. Then, allowing the chemical reactants of the liquor to react with lignin contained in the extracted wood particulates under controlled conditions of temperature and pressure for a sufficient time to solubilize and remove lignin. This is followed by producing a wood pulp having individual cellulosic fibers while releasing a reduced amount of VOCs in the wood pulping process.
    Type: Application
    Filed: November 6, 2001
    Publication date: June 13, 2002
    Applicant: Weyerhaeuser Company
    Inventors: Jerry R. Speaks, Roger O. Campbell, Michael A. Veal