Patents
Sitemap › D21 - Paper-making; Production of cellulose › D21C - Production of cellulose by removing non-cellulose substances from cellulose- containing materials; Regeneration of pulping liquors; Apparatus therefor › D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265)
11/1999
11/17/1999EP0956282A1 Sulphinic acid derivatives, method for producing them, and their use
11/17/1999EP0956132A1 A concentrator press
11/17/1999EP0920551A4 Method of agglomerating stickies in an aqueous slurry of wastepaper
11/17/1999CN2349244Y Circular seam screening drum
11/17/1999CN1235220A Process for pulping herbaceous plants without pollution
11/16/1999US5985097 Method for suppressing undesired effects of transition and alkaline metal compounds during bleaching
11/16/1999CA2037678C Process for producing high yield bleached pulp
11/11/1999WO1999057370A1 A method of producing a fiber product
11/10/1999EP0955405A1 Totally submerged pressurized pulp washer and method of operation thereof
11/10/1999EP0777781B1 A pulp slurry-handling press roll, and twin roll and single roll slurry-handling presses
11/09/1999US5981739 A cellulose crosslinker consists of a polyester which is a hydrolyzed reaction product of trimellitic anhydride and atleast one diol
11/09/1999US5981243 Purified myceliophthora laccases and nucleic acids encoding same
11/09/1999US5980689 Treating pulp with chelating agent to produce pulp flow with dissolved metal ions, washing pulp flow prior to bleaching with hydrogen peroxide or ozone and mixing washed liquid containing metal ions with another flow of lignocellulose
11/09/1999CA2113642C A process for producing thiourea dioxide and a process for bleaching pulp for papermaking by the use of thiourea dioxide obtained by said production process
11/07/1999CA2271615A1 Plate diffuser for treating comminuted cellulosic fibrous material
11/07/1999CA2271293A1 Plate diffuser for treating comminuted cellulosic fibrous material
11/05/1999CA2270382A1 Totally submerged pressurized pulp washer and method of operation thereof
11/04/1999WO1999039044B1 Method and device for measuring bleach requirement, bleachability, and effectiveness of hemicellulase enzyme treatment of pulp
11/03/1999EP0776394B1 Enhancements in pulping with dissolved solids control
11/03/1999CN2346822Y Device for avoiding wash engine spiral mesh-belt from skid
11/03/1999CN1233688A Compresion, diffusion and replacement union pulp washing machine
11/02/1999US5976320 Method for producing paper pulp from fibers of annual plants
10/1999
10/28/1999WO1999054545A1 Oxidase process for pulp and dye oxidation
10/28/1999WO1999054544A1 Method of producing lignocellulosic pulp from non-woody species
10/28/1999CA2328991A1 Method of producing lignocellulosic pulp from non-woody species
10/27/1999EP0951599A1 Treatment of pulp with a chelating agent without using a bleaching tower
10/27/1999CN2345572Y Double net multiple roller high concentrate extracting machine for paper-making black liquor
10/26/1999US5972872 Enzyme preparation with cellulytic activity
10/21/1999WO1999053133A1 Treatment of filtrates from peroxide bleaching of pulp
10/21/1999CA2325738A1 Treatment of filtrates from peroxide bleaching of pulp
10/20/1999EP0950136A1 Treatment of bleach plant filtrates with oxygen
10/20/1999EP0843757B1 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant
10/14/1999WO1999051810A1 Method and apparatus for countercurrent treatment of slurries
10/14/1999CA2337819A1 Method and apparatus for countercurrent treatment of slurries
10/12/1999US5965510 Enhancement of enzyme reactions
10/12/1999US5965017 Sealed shower system for rotary vacuum filter
10/07/1999DE19821311C1 Paper fiber bleaching solution reactor column used to bleach paper fibers
10/06/1999EP0947624A1 Apparatus for dewatering a contaminated fibrous suspension and cylinder for such an apparatus
10/06/1999EP0946819A1 Bleaching of cellulosic pulp with ozone and peracid
10/06/1999EP0946818A1 Method and device for process control during bleaching of fibrous materials
10/06/1999EP0946817A1 Treatment process for cellulosic fibers
10/06/1999EP0946810A1 Method and composition for increasing the strength of compositions containing high-bulk fibers
10/06/1999EP0946408A1 Treatment of chlorine dioxide generator effluent and feed streams with fixed-resin bed
10/06/1999EP0929717A4 Pitch control composition
10/06/1999EP0690937B1 Process for crosslinking of cellulosic fibers
10/06/1999CN1230980A Metal ligand containing bleaching compositions
10/06/1999CN1230979A Metal ligand containing bleaching composition
10/05/1999US5961783 Process for enhancing the strength and sizing properties of cellulosic fiber using a self-emulsifiable isocyanate and a coupling agent
10/05/1999US5960500 Stock washer for washing, thickening and classifying solids
10/05/1999CA2022760C Process for the comminution of materials
09/1999
09/30/1999WO1999049133A1 Method for producing pulp and paper with calcium carbonate filler
09/30/1999WO1999049128A1 Method for inhibiting the deposition of white pitch in paper production
09/30/1999CA2325433A1 Method for inhibiting the deposition of white pitch in paper production
09/30/1999CA2324459A1 Method for producing pulp and paper with calcium carbonate filler
09/29/1999CN1229871A Raw material of industrial filter paper and prepn. method thereof
09/28/1999US5958184 Process for producing thiourea dioxide
09/28/1999US5958180 Method for increasing the strength of a paper or paperboard product
09/28/1999US5958179 Process for increasing pulp whiteness by bleaching printed wastepaper under intense dispersing mechanical treatment
09/28/1999CA2066316C Process for making bleached high yield paper pulp
09/28/1999CA2041388C High performance paper pulp bleaching process using hydrogen peroxide
09/28/1999CA2003587C Deinked pulp bleaching process
09/24/1999CA2265182A1 Method for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage
09/23/1999WO1999047744A1 Chlorine dioxide bleaching with additives
09/23/1999WO1999047733A1 Lyocell fibers, and compositions for making the same
09/23/1999WO1999047248A1 Contaminant dispersants useful in recycling of treated containers
09/22/1999EP0943032A1 Multicomponent system for modifying, decomposing or bleaching lignin, lignin-containing materials or similar substances, and process for using the same
09/22/1999EP0652991B2 Zero discharge pulp mill
09/21/1999US5954066 Pressurized peroxide bleaching
09/16/1999WO1999046443A1 Method of papermaking having zero liquid discharge
09/16/1999WO1999046441A1 Method for bleaching and/or delignification of paper pulp
09/16/1999WO1999046440A1 Method for bleaching paper pulp
09/16/1999WO1999046234A1 Methods for the preparation of an n-bis-[2-(1,2-dicarboxy-ethoxy)-ethyl]amine derivative and products of the methods and their uses
09/16/1999WO1999046026A1 Variable pressure screening
09/16/1999WO1999046025A1 Pulp filter or washer and sealing for use therein
09/16/1999CA2323049A1 Pulp filter or washer and sealing for use therein
09/15/1999EP0941381A1 Method for controlling oxygen delignification of pulp
09/14/1999USRE36297 Method and apparatus for treating a fiber suspension
09/14/1999US5952394 Compositions and methods for inhibiting the deposition of organic contaminants in pulp and papermaking systems
09/14/1999CA2204522C Apparatus for fluffing pulp
09/14/1999CA2117368C Separation device and process
09/10/1999WO1999045204A1 Cotton linter tissue products and method for preparing same
09/10/1999WO1999045202A1 Improved papermaking processes
09/10/1999WO1999045192A1 Method for treating process water
09/10/1999CA2322209A1 Method for treating process water
09/08/1999EP0940498A1 Method for treatment of pulp
09/08/1999EP0939846A1 Production of soft paper products from coarse cellulosic fibers
09/08/1999CN2337177Y Horizontal flow stepped waste paper flotation de-inking machine
09/08/1999CN1227886A Method for reducing thermal and light-induced brightiness reversion in light-containing pulps
09/07/1999CA2170575C Apparatus for determining properties of slurry materials and sludge treating process
09/07/1999CA1340724C Process for treating a paper pulp with an enzymatic solution
09/01/1999EP0938925A1 Composition containing inorganic porous crystals-hydrophilic macromolecule composite and product made therefrom
08/1999
08/31/1999US5944952 Shredding; countercurrent flow
08/31/1999US5944951 Method for reusing spent gas from an ozone bleaching reactor
08/26/1999WO1999042657A1 Calcium carbonate synthesis method and resulting product
08/26/1999WO1999042651A1 Method for removing wax from a pulp furnish
08/26/1999CA2320961A1 Method for removing wax from a pulp furnish
08/25/1999EP0937813A2 Enhancement in pulping with dissolved solids control
08/25/1999EP0937173A1 Prebleaching of paperpulp before a peroxide bleaching stage
08/25/1999EP0937172A1 Method of producing pulp using single-stage cooking with formic acid and washing with performic acid
08/24/1999US5942126 Process to manufacture stabilized alkali or alkaline earth metal hypobromite and uses thereof in water treatment to control microbial fouling
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