| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 01/14/1987 | EP0208625A1 Treatment of chemical pulps with hydrogen peroxide in order to bleach them |
| 01/06/1987 | US4634529 Rotatable disc filter |
| 12/30/1986 | EP0207062A1 Pressurized pulp chlorination, and chlorine introduction in minute bubbles |
| 12/30/1986 | EP0206975A2 High consistency pressure screen and method of separating accepts and rejects |
| 12/30/1986 | EP0206560A2 Alkaline-peroxide-oxygen treatment for unbleached and chlorinated chemical pulps |
| 12/17/1986 | CN86103397A High consistency pressure screen and method of separating accepts and rejects |
| 12/16/1986 | CA1215259A1 Stationary diffuser |
| 12/02/1986 | US4626319 Process for the delignification and acid bleaching of cellulose with oxygen and hydrogen peroxide |
| 11/26/1986 | EP0202382A2 Process for the decolourization of pulp mill process streams |
| 11/25/1986 | US4624745 Foam controller |
| 11/25/1986 | US4624742 Method of determining black liquor solids concentration remaining in a washed pulp mat |
| 11/25/1986 | CA1214579A1 Apparatus for removal by flotation of solid particles from liquid |
| 11/25/1986 | CA1214303A1 Formable pulp compositions |
| 11/19/1986 | CN85108743A Process for the decolorization |
| 11/12/1986 | EP0112377B1 Ozone bleaching of cellulosic materials |
| 11/12/1986 | CA1213709A Shower pipes for rotary drum filter |
| 11/11/1986 | US4622101 Method of oxygen bleaching with ferricyanide lignocellulosic material |
| 11/11/1986 | US4622100 Process for the delignification of lignocellulosic material with oxygen, ferricyanide, and a protector |
| 11/11/1986 | US4621507 Distributing device for suspensions |
| 11/04/1986 | US4620451 Cellulose pulp sampling and cleaning device |
| 10/29/1986 | EP0198825A1 Pulp washer. |
| 10/28/1986 | US4619733 Pollution free pulping process using recycled wash effluent from multiple bleach stages to remove black liquor and recovering sodium hydroxide from the black liquor |
| 10/28/1986 | US4619414 Multi-disk refiner |
| 10/28/1986 | CA1213104A1 Method and apparatus for oxygen delignification |
| 10/22/1986 | CN85103252A Method and apparatus for controlling the consistency of a pulp suspension |
| 10/15/1986 | EP0197731A2 Apparatus and method for thickening pulp and paper stock |
| 10/14/1986 | US4617099 Electrochemical bleaching of wood pulps |
| 10/14/1986 | US4616489 Stock washer |
| 10/09/1986 | WO1986005708A1 A deaeration tank and process for using the tank |
| 10/08/1986 | EP0196578A2 Stationary diffuser |
| 10/07/1986 | CA1212369A1 Method for preparing absorbent fibrous fluff |
| 09/30/1986 | US4614647 Pumpable paste |
| 09/30/1986 | US4614646 Amino phosphonic acid chelant with acrylic polymer |
| 09/25/1986 | WO1986005529A1 Process for preparing bleached pulp out of lignocellulosic raw material |
| 09/25/1986 | WO1986005525A1 Method and apparatus for detecting contamination in paper pulp |
| 09/23/1986 | CA1211651A1 Dehydration machine for pulp, sludges or similar fibrous materials |
| 09/16/1986 | US4612088 Size reduction of solids in suspension; paper pulp |
| 09/02/1986 | US4609432 Small amount of unrefined fiber coated with heat activatable bonding |
| 08/28/1986 | WO1986004938A1 Method and apparatus for alkaline delignification of lignocellulosic fibrous materials |
| 08/27/1986 | EP0192216A1 A water absorbent fibrous product and a method of producing the same |
| 08/26/1986 | US4608122 Method for washing a paper fiber on a belt washer using a sonic frequency disturbance |
| 08/26/1986 | CA1210208A1 Selective bleaching of paper stock and pulp from magazines, and paper made from said pulp |
| 08/20/1986 | EP0191756A1 Multi peroxide stage mechanical pulp bleaching |
| 08/20/1986 | EP0191714A2 Multi-disk refiner |
| 08/19/1986 | CA1209837A1 Process for inexpensively producing cellulose pulp |
| 08/14/1986 | WO1986004621A1 Cationic cellulose product and method for its preparation |
| 08/13/1986 | EP0190723A1 Process for improving the mechanical properties of a chemical or semi-chemical bagasse paper pulp |
| 08/13/1986 | CN86100235A Multi-disk refiner |
| 07/30/1986 | CN86101158A Process for the mechanical properties improvement of chemical or semi-chemical begasse pulp |
| 07/29/1986 | US4602982 Process for delignifying bleaching lignin-containing cellulose pulp by activating the pulp with NO2 and O2 gas in the presence of water, sodium nitrate and nitric acid |
| 07/29/1986 | CA1208631A1 Redispersible microfibrillated cellulose |
| 07/23/1986 | EP0188146A1 Process for preparing cellulose modified so as to enhance the absorbing properties |
| 07/16/1986 | EP0187477A1 Multistage brightening of high yield and ultra high-yield wood pulps |
| 07/15/1986 | CA1207503A1 Processes for bleaching wood pulp |
| 07/09/1986 | EP0186990A2 Improved stabilization of peroxide systems in the presence of alkaline earth metal ions |
| 07/03/1986 | WO1986003795A1 A process and apparatus for continuously treating pulp with a treating liquid |
| 07/02/1986 | EP0185963A2 Method of combating slimy deposits in closed water loop plants |
| 07/02/1986 | EP0185858A1 Process for delignifying sulphate pulp |
| 07/02/1986 | CA1206704A Treatment of chemical pulp |
| 07/02/1986 | CA1206703A Tin compounds for brightness improvement of jack pine ultra high yield pulp |
| 07/01/1986 | US4597872 Method for anaerobic wastewater treatment |
| 06/24/1986 | US4596630 Reacting with polydentate ligand complex of chromium or vanadium ions |
| 06/18/1986 | EP0184603A1 Process for preparing a fluff pulp |
| 06/17/1986 | US4595456 Subjecting pulp to plurality of washing steps, heat exchanging, washing filtrates, combining filtrate with cooking liquid conveyed to digestion stage, diluting, heat exchanging |
| 06/17/1986 | CA1205959A1 Process for delignifying bleaching lignin-containing cellulose pulp |
| 06/10/1986 | US4594152 Screening pulp |
| 05/27/1986 | CA1204981A1 Biocide |
| 05/20/1986 | CA1204564A1 Pulp treating process |
| 05/20/1986 | CA1204560A1 Method and equipment for pulp bleaching |
| 05/13/1986 | CA1204254A1 Method for treating cellulose obtained from cellulose cooking process |
| 05/07/1986 | EP0180529A1 Process for preparing chemical wood pulps with a view to bleaching |
| 04/29/1986 | US4585551 Papermaking |
| 04/22/1986 | CA1203407A1 System for washing pulp |
| 04/16/1986 | EP0178271A1 Apparatus for liquid treatment of pulp |
| 04/15/1986 | US4582568 Apparatus for controlling the consistency of a pulp suspension |
| 04/09/1986 | EP0177113A1 Improved method of brown stock washing |
| 04/08/1986 | US4581104 Method of reducing the lignin in wood pulp with oxygen gas recirculation |
| 04/02/1986 | EP0175991A1 Method for producing high-yield paper-making pulp |
| 04/01/1986 | US4579628 Process for chlorine bleaching of kraft pulp using a sulfite extraction stage |
| 04/01/1986 | US4579592 Insulator |
| 03/26/1986 | EP0060277B1 Process to produce pulps |
| 03/18/1986 | US4576609 Brightening |
| 03/11/1986 | CA1201640A1 Aqueous dispersion microbiocide composition containing methylene bis (thiocyanate) |
| 02/19/1986 | EP0171575A1 Process for the delignification and bleaching of cellulose pulps |
| 02/12/1986 | EP0171370A1 Method for the reduction of discolouration and/or tackiness when upgrading waste paper |
| 02/11/1986 | CA1200353A1 Process for minimizing discolouration in pulping systems |
| 02/04/1986 | US4568420 Multi-stage bleaching process including an enhanced oxidative extraction stage |
| 01/21/1986 | US4565602 Method for treating cellulose obtained from cellulose cooking process |
| 01/14/1986 | US4564144 Stationary diffuser |
| 01/08/1986 | EP0167060A1 A process for dispersing one fluid in another |
| 12/31/1985 | US4562218 Formable pulp compositions |
| 12/27/1985 | EP0165867A1 Process for bleaching mechanical pulp with hydrogen peroxide |
| 12/24/1985 | US4560474 Flotation apparatus for floating fiber suspensions extracted from waste paper |
| 12/24/1985 | US4560440 Continuous monitoring of brown stock; measuring electrical resistamce |
| 12/24/1985 | US4560437 Process for delignification of chemical wood pulp using sodium sulphite or bisulphite prior to oxygen-alkali treatment |
| 12/20/1985 | CN85105596A Vertical washing engine |
| 12/17/1985 | US4559103 Packaging paper and packaging material for packaging metallic material and method of producing the same |
| 12/17/1985 | US4558477 Process for washing fibre stock |
| 12/10/1985 | US4557800 Process of forming a porous cellulosic paper from a thermal treated cellulosic non-bonding pulp |
| 12/10/1985 | US4557120 Apparatus for washing fibre stock |