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| Number | Title | Issue Date |
| 8007636 | Method of treating cellulose fibres with chlorine dioxide and an alkyl cellulose derivative The present invention relates to methods of modifying cellulose fibers and of producing paper which methods include providing a pulp suspension of cellulose fibers and adding a cellulose derivative during the bleaching of the cellulose fibers in an acidic bleaching ... | 08/30/2011 |
| 7377993 | Methods for reducing fluorescence in pulp and paper Methods for reducing, and in some cases eliminating, fluorescence in pulp and paper, as well as the resulting articles, are provided. The methods destroy fluorescent activity of agents (e.g., whitening agents) which may be present in the pulp during processing. The ... | 05/27/2008 |
| 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 |
| 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 |
| 6777103 | Fiber cement composite material using biocide treated durable cellulose fibers A fiber cement composite material providing improved rot resistance and durability, the composite material incorporating biocide treated fibrous pulps to resist microorganism attacks. The biocide treated fibers have biocides attached to inner and outer surfaces of i... | 08/17/2004 |
| 6660128 | Oxidase process for pulp A method for selectively delignifying lignocellulosic materials and bleaching of pulp and dyes using a combination of an oxidative enzyme and a metal complex. More specifically, the process involves the oxidation of a transition metal redox complex by a p... | 12/09/2003 |
| 6398908 | Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound A process for delignification and bleaching of chemically digested lignocellulose-containing pulp. In a first embodiment, the pulp is acid treated at a pH of between about 1 and about 6, whereupon a water-soluble compound containing an alkaline earth meta... | 06/04/2002 |
| 6273994 | Method and device for measuring bleach requirement, bleachability, and effectivenss of hemicellulase enzyme treatment of pulp The present invention relates to a device and method for measuring the bleach requirement and bleachability of pulp in a pulp mill. The invention enables pulp mill operators to better control bleach plants. In one aspect, the invention comprises a system ... | 08/14/2001 |
| 6235154 | Chlorine dioxide bleaching in the presence of an aldehyde A method which enhances the effectiveness of chlorine dioxide bleaching of lignocellulosic materials. It is effected by adding to the chlorine dioxide bleaching stage an aldehyde compound at a concentration of from about 0.01% to about 20%, by weight of t... | 05/22/2001 |
| 6228213 | Production of microcrystalline cellulose by reactive extrusion This process involves feeding cellulose into an extruder with an acid solution. The extruder is comprised of a screw and a barrel. The screw is rotated so as to pressurize the cellulose, and the cellulose undergoes acid hydrolysis and forms microcrystalli... | 05/08/2001 |
| 5900113 | Method of using fluorescent tracers to monitor chlorine dioxide in pulp and paper processes The present invention provides a method of monitoring a papermaking system and unit operations contained therein to optimize the overall papermaking process. The method comprises employing a fluorescent tracer that is selectively carried through the entir... | 05/04/1999 |
| 5662773 | Process for preparation of cellulose acetate filters for use in paper making The present invention discloses a process for treating filter rods comprising cellulose acetate tow waste comprising the steps of: a. cutting said filter rods so that fiber of said cellulose acetate have a fiber length of less than about 4 inches; and b. treat... | 09/02/1997 |
| 5618385 | Method of peroxide bleaching of pulp using a peroxide decomposing inactivator Chlorine dioxide is used to stabilize hydrogen peroxide in bleach liquor at alkaline pH. This is thought to be aided by the destruction of enzymes (especially catalase) produced by bacteria. The method is useful for the reprocessing of pulps, especially w... | 04/08/1997 |
| 5574088 | Increasing the resistance of fiber material to oxidizing agents A composition for increasing the resistance of polyamide fibers or polyester fibers to oxidizing agents comprising an organosiloxane modified with amino groups, melamine formaldehyde resin, a catalyst for complexing the melamine formaldehyde resin and wat... | 11/12/1996 |
| 5554535 | White-rot fungus and uses thereof The white rot fungus Scytinostroma galactinum strain F361 and mutants thereof are particularly effective in selectively grading the lignin component of lignin-containing materials, particularly processed wood pulps including chemical pulps, and also parti... | 09/10/1996 |
| 5358864 | Cloning and expression of xylanase genes from fungal origin Methods and expression constructs are provided for the cloning and overexpression of xylanases of fungai origin in a selected microbial host cell. Xylanases of fungal origin generally have lower pH optima and remain stable over a broader pH range than do ... | 10/25/1994 |
| 5330620 | Bleaching pulp with chloric acid A process for bleaching pulp which employs chloric acid as the oxidizing agent, in the absence of a transition metal catalyst.... | 07/19/1994 |
| 5273625 | Method of treating bleached pulp on a washer with calcium ions to remove sodium ions Method for treating chemically treated cellulosic pulp that contains sodium ions wherein the pulp is subjected to an ion exchange with a cation (preferably calcium) having a higher valence than the sodium followed by washing of the sodium cations from the... | 12/28/1993 |
| 5139613 | Process for preparing a paper pulp using carbon dioxide as an acidifying agent for a bleached pulp A process for souring chemical or mechanical cellulosic pulp using carbon dioxide to obtain proper acidification of the pulp slurry. The souring is performed after a single or a multistage bleaching sequence ending with sodium hypochlorite, calcium hypoch... | 08/18/1992 |
| 5013404 | Process for alkaline peroxide bleaching of wood pulp using a quaternary amine as additive A process for alkaline hydrogen peroxide bleaching of mechanical wood pulp which employs a quaternary amine compound, such as (3-chloro-2-hydroxypropyl)trimethyl ammonium chloride, in the stabilized bleach solution. The brightness of the final paper produ... | 05/07/1991 |
| 4956048 | Method of alcohol washing brownstock pulp prior to a chlorination bleaching stage In the method of chemical pulping of wood including a chlorination stage pulp bleaching step followed by alkaline extraction, a method of reducing the amount of dioxins and furans produced thereby is disclosed wherein the brownstock pulp is first washed w... | 09/11/1990 |
| 4740212 | Process and composition for bleaching cellulosic material with hypochlorous acid A process and composition especially suited for bleaching wood pulp characterized by the use of hypochlorous acid in combination with chlorine dioxide and/or a nitrogen compound having the characteristic of minimizing fiber degradation and enhancing fiber... | 04/26/1988 |
| 4702807 | Electrochemical process for bleaching wood pulp using chlorate and a redox catalyst An electrochemical process for delignification and bleaching of pulp fibers is disclosed. The process involves the use of metallic chlorates and vanadium catalysts in the presence of an electric current to provide a pulp fiber of improved brightness and v... | 10/27/1987 |
| 4537656 | Method for delignifying or bleaching cellulose pulp wherein chlorine is added to recycle liquor to regenerate chlorine dioxide A method for delignifying and/or bleaching cellulose pulp adds to the cellulose pulp a liquid which contains chlorine dioxide, causes the pulp to react with the chlorine dioxide over a selected period of time, and then reduces the amount of available acti... | 08/27/1985 |
| 4487656 | Process for bleaching paper pulp using melamine as a viscosity stabilizer A process for maintaining pulp viscosity while enhancing brightness during the bleaching stage or stages of pulp preparation in the manufacture of paper comprising adding an effective amount of melamine to paper pulp prior to or during the bleaching stage... | 12/11/1984 |
| 4484980 | Process for bleaching paper pulp using caffeine or guanine as a viscosity stabilizers A process for maintaining pulp viscosity during the bleaching stage or stages of pulp preparation in the manufacture of paper comprising adding an effective amount of caffeine or guanine prior to or during the bleaching stage. One example adds caffeine or... | 11/27/1984 |
| 4480089 | Modified cellulose products by bleaching Modified cellulose products for use as carrier vehicles in forming cosmetics, pharmaceutical preparations, insecticides, etc. are prepared by treating a minimum weight ratio of about 10:1 of fibrous cellulosic material with an alkali metal or alkaline ear... | 10/30/1984 |
| 4444621 | Process and apparatus for the deresination and brightness improvement of cellulose pulp A process and apparatus are provided for the deresination and brightness improvement of cellulose pulp, by adjusting the pulp concentration to within the range from about 15 to about 35%; adding sufficient alkali to the pulp to bring the amount of alkali,... | 04/24/1984 |
| 4298428 | Use of additives in pulp bleaching processes to preserve pulp strength Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of certain amine materials in the hypochlorite bleaching stage.... | 11/03/1981 |
| 4295928 | Phenolic compounds as viscosity preservatives during hypochlorite pulp bleaching Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of certain aromatic materials in the hypochlorite bleaching stage.... | 10/20/1981 |
| 4255233 | Use of polyacrylic acid in pulp bleaching processes to preserve pulp strength and aid in brightness Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05--0.5% based on the weight of the dry fiber of polyacrylic acid and/or its water-soluble salts in the chlorination bleaching st... | 03/10/1981 |
| 4244780 | Use of thiourea dioxide in pulp bleaching processes to preserve pulp strength and aid in brightness Inproved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of thiourea dioxide in the chlorination or hypochlorite bleaching stages.... | 01/13/1981 |
| 4244777 | Bleaching stilbene yellow dyed wood pulp Chlorine dioxide is a specific bleaching agent for stilbene yellow dye which has been used to dye paper stock. Chlorine dioxide may be used in amounts as low as 0.25% based on the oven dry weight of the pulp fiber.... | 01/13/1981 |
| 4222818 | Method for treatment of lignocellulosic material with chlorine A pulp containing lignocellulosic fibers is treated with chlorine in two steps. In the first step, chlorine in the amount of 0.6-0.9 grams per gram of lignin in the fibers, is mixed in the gaseous state into the pulp and in a second step the reaction prod... | 09/16/1980 |
| 4207140 | Method of producing groundwood pulp A process is provided for preparing groundwood pulp from debarked pulpwood logs, which comprises grinding the logs under a superatmospheric pressure of a gas selected from the group consisting of steam, air, and steam and air, while continuously supplying... | 06/10/1980 |
| 4160693 | Process for the bleaching of cellulose pulp A process is provided for the bleaching of cellulose pulp, particularly for the peroxide bleaching of high yield pulp, which comprises forming a suspension of lignocellulosic pulp material; mixing the suspension in a mixing zone with a bleaching agent whi... | 07/10/1979 |
| 4098639 | Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material A process is provided for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material with alkaline sodium- and sulfur-containing-sulfate pulping liquor, which comprises evaporating and burning spent sulf... | 07/04/1978 |
| 4096029 | Cellulosic pulp delignification using an acidic bromine-chlorine mixture Efficient lignin removal from cellulosic pulp with decreased cellulose degradation is attained by replacing chlorine with an acidic bromine-chlorine mixture in acidic chlorination of the pulp.... | 06/20/1978 |
| 4093506 | Method and apparatus for effecting even distribution and mixing of high consistency pulp and treatment fluid Method and apparatus for the continuous distribution and mixing of high concentration pulp with at least one treatment fluid such as chlorine or chlorine dioxide. An enclosed housing has a cylindrical portion, a closed conical wall portion extending inwar... | 06/06/1978 |
| 4042452 | Process for washing cellulose pulp from alkali digestion wherein acid is added to the washing solution A process for washing a cellulose pulp from alkali digestion, wherein the pulp is fed into a multistage washing system comprising several countercurrently coupled washers, acid is added to a washing solution, the acidified fiber suspension is fed further ... | 08/16/1977 |
