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| Number | Title | Issue Date |
| 8182650 | Modified Kraft fibers A method of producing a modified pulp comprising treating wood chips in an extraction process to remove hemicellose to form treated wood chips; and subjecting said treated wood chips to chemical or semichemical pulping to form a modified Kraft pulp wherein the amoun... | 05/22/2012 |
| 7754048 | Bleaching of cellulosic fibre material with peroxide using polymers as a stabiliser The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or mal... | 07/13/2010 |
| 7585387 | Chemical oxidation for cellulose separation with a hypochlorite and peroxide mixture An oxidative solution (Ox-B, a solution of no less than 5:1 sodium hypochlorite: hydrogen peroxide) was found to remove both lignin and hemicellulose from sugarcane bagasse. After treatment the cellulosic residue readily separated from the lignin and hemicellulose b... | 09/08/2009 |
| 7520958 | Modified kraft fibers A method of producing a modified pulp comprising treating wood chips in an extraction process to remove hemicellose to form treated wood chips; and subjecting said treated wood chips to chemical or semichemical pulping to form a modified Kraft pulp wherein the amoun... | 04/21/2009 |
| 7481905 | Process for manufacturing board The invention relates to a process for manufacturing liquid packaging board, in which process a board pulp is treated with a percarboxylic acid by adding to the pulp percarboxylic acid in an amount of 0.5-5 kg/ton of dry pulp, indicated as a 100 percent percarboxyli... | 01/27/2009 |
| 7419568 | Chemically cross-linked cellulosic fiber and method of making same The present invention relates to cross-linked cellulosic fiber having improved absorbency characteristics when compared to conventional cross-linked fibers. The cross-linked cellulosic fiber is obtainable by reacting pulp in the sheet or fluff form with one or more ... | 09/02/2008 |
| 7402224 | Method for producing paper pulp, lignins, sugars and acetic acid by frantionation of lignocellulosic vegetable material in formic/acetic acid medium A method for producing paper pulp from a lignocellulosie vegetable raw material. The method includes contacting the raw material with a mixture of formic acid and acetic acid (in an amount more than 5 wt. % of the mixture) at a temperature and for a suitable reactio... | 07/22/2008 |
| 7390378 | Method of curling fiber and absorbent sheet containing same A method of providing papermaking fibers with durable curl comprising: a) introducing papermaking fiber into a rotatable drum adapted for operation at elevated pressure; b) rotating the drum containing the papermaking fiber while maintaining: i) the fiber in aqueous... | 06/24/2008 |
| 7368036 | Xylanase treatment of chemical pulp The present invention discloses methods of bleaching chemical pulp that use xylanase enzymes after chemical bleaching. The method comprises the steps of carrying out a chlorine dioxide stage to produce a partially bleached pulp, treating the partially bleached pulp ... | 05/06/2008 |
| 7364640 | Chemimechanical desilication of nonwood plant materials A process for removing silica from nonwood plant materials involving both chemical and mechanical action is described. The silica-rich epidermal cells are liberated mechanically by a pre-pulping and low-consistency refining step and subsequently removed from the pul... | 04/29/2008 |
| 7326317 | Lignocellulose product The invention concerns a process for the production of activated fibres or particles having self-binding properties comprising the steps of treating fibers or particles of lignocellulose containing material by contacting them with an oxidant during a time sufficient... | 02/05/2008 |
| 7320741 | Method of xylanase treatment in a chlorine dioxide bleaching sequence A method of bleaching chemical pulp with xylanase after chemical bleaching is provided. The method comprises the steps of exposing chemical pulp to a chlorine dioxide bleaching stage to produce a partially bleached pulp, treating the partially bleached pulp with a x... | 01/22/2008 |
| 7320740 | Chemically cross-linked cellulosic fiber and method of making same The present invention relates to cross-linked cellulosic fiber having improved absorbency characteristics when compared to conventional cross-linked fibers. The cross-linked cellulosic fiber is obtainable by reacting pulp in the sheet or fluff form with one or more ... | 01/22/2008 |
| 7297225 | Process for high temperature peroxide bleaching of pulp with cool discharge A process for high temperature peroxide bleaching of pulp in which pulp is retained at high temperature and pressure to increase bleaching activity but in which the pulp is cooled prior to discharge from the pressure vessel below the flash point thereby resulting in... | 11/20/2007 |
| 7291247 | Absorbent sheet made with papermaking fibers with durable curl 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 condition... | 11/06/2007 |
| 7285181 | Bleaching and brightness stabilization of lignocellulosic materials with water-soluble phosphines or phosphonium compounds A method for the bleaching and brightness stabilization of lignocellulosic materials is described. The method involves the treatment of lignocellulosic materials, in particular, (a) wood pulps such as thermomechanical pulps (TMP) and chemithermomechanical pulps (CTM... | 10/23/2007 |
| 7267744 | Pulp treatment and process This invention provides a process for treating chemical woodpulp, or chemical cellulose including cotton linter, including the step of applying an electron processing technology (EPT) step to chemical woodpulp, or chemical cellulose, as the case may be, on an in-lin... | 09/11/2007 |
| 7264690 | Catalyzer for clean pulping and process for using the same A catalyzer for clean pulping includes sodium salicylate, anion silicate softener, cooking aids, liquid(gaseous) chlorine and water. A process for using the catalyzer for clean pulping includes the following steps: 1, cutting and impurities removing for the r... | 09/04/2007 |
| 7214291 | Method for the modification of cellulose fibres The invention relates to a method for the modification of cellulose fiber with the object of increasing the strength properties of the pulp. Cellulose derivative, preferably in the form of CMC, is added in association with alkali cooking and/or delignification of ce... | 05/08/2007 |
| 7214292 | Addition of THP or THP+ salt to pulping liquors to destroy catalase and/or catalase producing bacteria Pulping liquors used in the bleaching of pulps by hydrogen peroxide, and containing catalase-producing bacteria and/or catalase enzyme are treated with tris (hydroxymethyl) phosphine or a tetrakis (hydroxymethyl) phosphonium salt to kill the bacteria and destroy the... | 05/08/2007 |
| 7189306 | Process of treating lignocellulosic material to produce bio-ethanol This invention relates to a process of treating a lignocellulosic material to produce bio-ethanol. The process includes the steps of: (a) exposing the lignocellulosic material to conditions including a pH not less than about 8, and steam at a first pressure, to prod... | 03/13/2007 |
| 7189329 | Control of development of biofilms in industrial process water There is provided a method of inhibiting the development of a biofilm adjacent a surface, the method comprising intermittently applying a biofilm inhibiting substance to a collection of microorganisms having biofilm developing potential. Other embodiments are also d... | 03/13/2007 |
| 7182835 | Two-stage chlorine bleaching process with filtrate recirculation Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline bleaching stage, followed by a third chlorine dioxide bleaching stage, de... | 02/27/2007 |
| 7138035 | Process for the selective modification of carbohydrates by peroxidase catalyzed oxidation The present invention relates to an environmentally friendly process for the selective oxidation of carbohydrates. The process comprises the addition of a hydroperoxide, including hydrogen peroxide, to a carbohydrate having primary alcohol groups, particularly inclu... | 11/21/2006 |
| 7090744 | Process for making composition for conversion to lyocell fiber from sawdust A process for making a composition for conversion to lyocell fiber where the process comprises pulping a raw material in a digester to provide an alkaline pulp, wherein the raw material comprises sawdust in an amount greater than 0 % up to 100 %; and contacting the ... | 08/15/2006 |
| 7083704 | Process for making a composition for conversion to lyocell fiber from an alkaline pulp having low average degree of polymerization values The present invention provides compositions, useful for making lyocell fibers, having a high hemicellulose content, a low copper number and including cellulose that has a low average degree of polymerization (D.P.) and a narrow molecular weight distribution. Further... | 08/01/2006 |
| 7052578 | Process employing magnesium hydroxide in peroxide bleaching of mechanical pulp Wood pulp is bleached using hydrogen peroxide as the oxidative bleaching agent in the presence of magnesium hydroxide or magnesium oxide. The bleaching process is carried out in the presence of magnesium hydroxide as the predominant, and preferably essential, source... | 05/30/2006 |
| 7005034 | Method in connection with the production of mechanical pulp 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 refinin... | 02/28/2006 |
| 7001484 | Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent A process for peroxide bleaching of mechanical or high yield pulp, the process comprising adding to a pulp slurry at least one stabilizer for stabilizing low valency states of transition metal ions in the slurry; subsequently adding caustic soda to said slurry simul... | 02/21/2006 |
| 6998015 | Method for reducing alkaline darkening of mechanical pulp containing a calcium carbonate filler A method is disclosed for reducing or inhibiting alkaline darkening of mechanical pulp caused by the presence of calcium carbonate filler during production; the method comprises adding a sulfite, or sulfur-containing reducing agent, especially a sulfite to the mecha... | 02/14/2006 |
| 6958108 | Method of producing a fiber product having a strength suitable for printing paper and packaging material The present invention relates to a modified fiber product and a method of producing same. According to the method, the cellulosic raw material is formed into a fiber suspension, into which components modifying the properties of the fibers are added, subsequent to wh... | 10/25/2005 |
| 6923887 | Method for hydrogen peroxide bleaching of pulp using an organic solvent in the bleaching medium Disclosed is a method for pulp bleaching. The method comprises the steps of providing a pulp sample for bleaching, the pulp sample stemming from a pulp producing process, providing a bleaching liquor comprising water and an organic component as solvent components co... | 08/02/2005 |
| 6905520 | Mineral stains for wood and other substrates According to the invention, a metal salt and an oxygen source are applied to penetrate or impregnate a suitable substrate sequentially in effective amounts so as to react in contact with the substrate and produce a mineral compound fixed within the surface of the su... | 06/14/2005 |
| 6902649 | Enhanced fiber additive; and use The disclosure provides a process of modifying a seed based fiber (SBF) to form an enhanced fiber additive (EFA). The process includes an acid treatment step and optionally at least one fiber modification step. Preferred EFA products and uses are described. ... | 06/07/2005 |
| 6899790 | Method of providing papermaking fibers with durable curl 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 prec... | 05/31/2005 |
| 6881299 | Refiner bleaching with magnesium oxide and hydrogen peroxide Methods of bleaching mechanical pulp under alkaline conditions with hydrogen peroxide. The methods include introducing a source of magnesium ions and hydroxyl ions to a refiner. The wood particulates are refined into a pulp in the presence of the magnesium ions and ... | 04/19/2005 |
| 6776876 | Method of treating cellulosic pulp to remove hexenuronic acid Chemical cellulose pulp produced by alkaline delignification and having a kappa number of under 24 (e.g. 14 or below) having hexenuronic acid is treated to remove at least 50% of the hexenuronic acid (e.g. 90-97%) such as by treating the pulp at a temperature over 8... | 08/17/2004 |
| 6746568 | Treatment of filtrates from peroxide bleaching of pulp A method in bleaching of pulp is described, in which the pulp is subjected to a peroxide bleaching step, whereupon the pulp is washed and the washing liquid from the washing is separated from the pulp in the form of a filtrate. The method is characterised in that th... | 06/08/2004 |
| 6743332 | High temperature peroxide bleaching of mechanical pulps A method of making bleached mechanical pulps is disclosed for pulping mills having a primary and a secondary refiner. A first step is to provide cellulosic materials, such as wood chips to refine into the pulp; the wood chips have an initial brightness level. A seco... | 06/01/2004 |
| 6736934 | Method of pretreating pulp in an acid tower prior to bleaching with peroxide The present invention relates to a method of pretreating, by acidification and chelation, of pulp to be bleached with peroxide. Especially, the invention relates to intensifying, and at the same time simplifying the pretreatment required by peroxide bleaching. It is... | 05/18/2004 |
