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| Number | Title | Issue Date |
| 8157956 | Cylindrical bearing for pressure diffuser and associated method A bearing cylinder for a screen assembly of a pressurized pulp diffuser, the bearing cylinder including: a plurality of segments of the bearing cylinder wherein the segments are arranged side-by-side to form the bearing cylinder; and each of said segments includes a... | 04/17/2012 |
| 8052839 | Apparatus and method for washing pulps An apparatus for treating pulp including: at least one liquid-permeable surface rotating around a shaft, onto which surface a pulp layer is formed; a feeder to feed pulp to the apparatus for treatment on the liquid-permeable surface; an internal barrier defining a f... | 11/08/2011 |
| 7981248 | Gas free valve for pulp vacuum washer and method A method of treating pulp on a porous surface of a rotating drum cylinder having a lower drum portion in a vat of pulp slurry and a radial array of filtrate conduits including: as the porous surface of the drum rotates through the vat, drawing filtrate from the slur... | 07/19/2011 |
| 7780815 | Gas free valve for pulp vacuum washer and method In a rotary drum for condensing pulp from a pulp slurry vat, the drum including radial conduits delivering filtrate from a pulp mat on an outer surface of the drum to at least one filtrate conduit coaxial with a drum rotational axis, a valve segment in the filtrate ... | 08/24/2010 |
| 7575658 | Vacuum washer drum A vacuum drum washer is designed to enable the use of an end-draining drum for drum lengths exceeding 20 feet. The drum washer includes a cylindrical drum having a mesh screen defining an exterior wall. A plurality of outer filtrate channels are disposed radially in... | 08/18/2009 |
| 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 |
| 7384502 | Process for impregnating, refining, and bleaching wood chips having low bleachability to prepare mechanical pulps having high brightness 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 remov... | 06/10/2008 |
| 7374637 | Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of cellulose pulp established in the bleaching line. A single joint main c... | 05/20/2008 |
| 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 |
| 7351305 | Method and a digester for the continuous cooking of wood raw material to cellulose pulp The digester and method are for the continuous cooking of pulp. At least two withdrawal positions (11E, 11D) for cooking fluid are arranged at different heights in the digester (10). The cooking fluid in the first and second position is withdraw... | 04/01/2008 |
| 7347916 | Vacuum washer drum A vacuum drum washer is designed to enable the use of an end-draining drum for drum lengths exceeding 20 feet. The drum washer includes a cylindrical drum having a mesh screen defining an exterior wall. A plurality of outer filtrate channels are disposed radially in... | 03/25/2008 |
| 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 |
| 7282115 | Method for mitigating the interference caused by high-molecular weight-by-products in pulping processes Separation of dissolved and colloidal high molecular weight organic by-products from liquors or filtrates in a cellulosic pulping process to improve the overall efficiency of the process. ... | 10/16/2007 |
| 7279070 | Method for the continuous cooking of wood raw material for cellulose pulp The invention concerns a simplified method for the continuous cooking of wood raw material in the form of sawdust for the production of cellulose pulp, The method does not require any thickening stages and can be carried out with a minimum of process equipment. The ... | 10/09/2007 |
| 7252739 | Method for distributing cellulose pulp of low and medium consistency in order to form a uniform pulp web The method is for distributing cellulose pulp that has a 2-12% consistency. A manifoid housing is in fluid communication with distributor housing. The distributor housing has holes that are distributed along a generatrix of the distribution housing. The cellulose pu... | 08/07/2007 |
| 7226525 | Process for producing very low COD unbleached pulp A pulp product that has a low COD is comprised of an unbleached pulp that is soaked and washed in alkaline water for a sufficient time so that the COD after soaking and washing is less than or equal to 3.0 kg/1000 kg of dry pulp. The pulp is produced by repetitively... | 06/05/2007 |
| 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 |
| 7198695 | Method for separating hemicelluloses from a biomass containing hemicelluloses and biomass and hemicelluloses obtained by said method The invention relates to a method for separating hemicelluloses from a biomass containing hemicelluloses. The method includes the steps of: a) extracting the hemicelluloses from the biomass containing hemicelluloses by treating them with a complex compound in an aqu... | 04/03/2007 |
| 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 |
| 7163105 | Froth flotation process and apparatus A froth flotation process typically used to separate particulate materials such as coal, has a mixed size feed (1) separated in a sieve bend (2) into a stream of relatively fine particles (3) and a stream of relatively coarse particles (14 | 01/16/2007 |
| 7156952 | Method and arrangement for oxygen delignification of cellulose pulp The invention relates to a method and arrangement for alkaline oxygen delignification of cellulose pulp. By adding alkali in the final phase of the oxygen delignification one can ensure that an optimal predetermined end-pH is obtained. This provides advantages in th... | 01/02/2007 |
| 7081184 | Process for making a very low COD unbleached pulp A process for making a pulp product that has a low COD is comprised of soaking and washing pulp in alkaline water for a sufficient time so that the COD after soaking and washing is less than or equal to 2.0 kg/1000 kg of dry pulp. The process includes repetitively s... | 07/25/2006 |
| 7077931 | Method and bleaching line with a main conduit for wash liquor The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of cellulose pulp established in the bleaching line. A single joint main c... | 07/18/2006 |
| 7044307 | Drum type paper stock fine screen A drum type paper stock refine screen is provided which is capable of efficiently filtering a refined paper stock to the outside of a laterally suspended rotary drum and efficiently discharging foreign matter to the outside of the drum while rotating the drum. The d... | 05/16/2006 |
| 7018510 | Process for bio-bleaching of Kraft pulp using bacterial consortia The present invention relates to an environment friendly, safe, and efficient four-step method of bio-bleaching Kraft pulp using bacterial strains of accession no. MTCC 5096, MTCC 5094, MTCC 5095, and MTCC 5098, a microbial consortium comprising a synergistic mixtur... | 03/28/2006 |
| 7018509 | Elimination of alum yellowing of aspen thermomechanical pulp through pulp washing 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 washe... | 03/28/2006 |
| 7011741 | Filtration apparatus operating features A pressure-filter apparatus includes at least one filtration chamber coupled with a source of slurry. The filtration chamber is also coupled with a source of fluid at an elevated pressure, which may be arranged in series or in parallel with a source of wash fluid. T... | 03/14/2006 |
| 6986828 | Process for producing low DP microcrystalline cellulose A process for producing microcrystalline cellulose. The process comprising the following steps: a) preparation of a pulp by repulping, b) pressing of the pulp obtained in a), c) decompaction of the... | 01/17/2006 |
| 6966970 | Method for supplying washing liquid to a process for cooking cellulose pulp The invention relates to a method for supplying washing liquid to a digester (1) for cellulose pulp and a subsequent diffuser washing device (2a, 2b). A high, disturbance-free production capacity can be obtained by using a common feed pump (P... | 11/22/2005 |
| 6946072 | Method and apparatus for washing a fibre suspension A method for washing a fibre suspension with washing liquid, in which, in accordance with the invention, the fibre suspension is introduced into an annular treatment channel (24) that has an inlet end (72) and an outlet end (73) and is concentri... | 09/20/2005 |
| 6942754 | Process for producing xylooligosaccharide from lignocellulose pulp Xylooligosaccharide is produced from a lignocellulose pulp by enzyme-treating a lignocellulose pulp with hemicellulase, filtering the resultant reaction mixture to separate a liquid fraction from the enzyme-treated pulp, subjecting the separated liquid fraction to a... | 09/13/2005 |
| 6923888 | Process for recovering organic acids from bleaching liquors The invention relates to a process for treating bleaching liquors from pulping processes based on organic acids. The process is characterized in that inorganic acid, such as nitric acid, phosphoric acid and/or sulphuric acid, is added into a bleaching liquor obtaine... | 08/02/2005 |
| 6896810 | Process for producing alkaline treated cellulosic fibers Systems and methods by which to subject cellulosic fibers to alkaline treatment are provided. The systems and methods of the invention include equipment, such as nanofiltration units and slurry concentrators, which result in a lowered overall consumption of alkaline... | 05/24/2005 |
| 6868973 | Drum type refining or washing apparatus The present invention provides a drum type refining or washing apparatus in which the refining or washing efficiency of a pulp suspension or a food suspension is remarkably enhanced by the filtration function of a rotary drum and by the filtrate sucking force of a f... | 03/22/2005 |
| 6773546 | Black liquor removed from pulp Pulp, containing black liquor, is separated to produce pulp substantially free of black liquor. An organic solvent forms a layer within a vessel and adding a pulp containing black liquor will establish three layers. From the lower layer, pulp substantially free of b... | 08/10/2004 |
| 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 |
| 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 |
| 6733625 | Method and apparatus for treating pulp The present invention relates to a method of treating chemical pulp in order to optimize the consumption of bleaching chemicals and to improve the quality of the pulp. Especially the invention relates to a method according to which filtrate obtained from a suitable ... | 05/11/2004 |
| 6719878 | Method for avoiding mechanical damage of pulp A method for producing chemical pulp from cellulosic material by means of alkaline cooking, including cooking the material to pulp at cooking temperature in a digester, reducing the temperature at the end of the cook, substantially relieving the overpressure in the ... | 04/13/2004 |
| 6620292 | Cellulose production from lignocellulosic biomass A multi-function process is described for the separation of cellulose fibers from the other constituents of lignocellulosic biomass such as found in trees, grasses, agricultural waste, and waste paper with application in the preparation of feedstocks for ... | 09/16/2003 |
