| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 01/01/1991 | US4981556 Papermaking |
| 01/01/1991 | US4981413 Pump for and method of separating gas from a fluid to be pumped |
| 12/27/1990 | EP0403849A2 High opacity paper containing expanded fiber and mineral pigment |
| 12/22/1990 | CA2019411A1 Enzymatic delignification of lignocellulosic material |
| 12/12/1990 | EP0402335A2 Process for bleaching lignocellulose-containing pulps |
| 12/11/1990 | US4976819 Wringing, dewatering, compacting |
| 12/11/1990 | US4976586 Pump with separate fluidizing vaned shaft adjacent impeller |
| 12/11/1990 | CA1277532C Apparatus for washing cellulose |
| 12/11/1990 | CA1277457C Process for bleaching and delignifying cellulose- containing products |
| 12/05/1990 | EP0401149A1 Hydrogen peroxide reinforced oxygen delignification |
| 12/04/1990 | US4975204 Method and apparatus for thickening fiber suspension |
| 12/04/1990 | US4975148 Cold blow system for batch production of pulp |
| 12/04/1990 | CA1277109C Control of peroxide bleaching of different pulps |
| 12/04/1990 | CA1277108C Mixing cl gas into paper pulp slurries |
| 11/28/1990 | EP0399564A2 Absorbent web and applications of same |
| 11/20/1990 | US4971694 Double diffuser with backflush pistons |
| 11/20/1990 | US4971658 Method of intensifying the washing of a fiber suspension |
| 11/20/1990 | US4971519 Method and apparatus for pumping high consistency medium |
| 11/20/1990 | CA1276408C Pressurised pulp chlorination and chlorine introduction in minute bubbles |
| 11/16/1990 | WO1990014463A1 Method for reducing chlorinated compounds produced during chlorination stage bleaching of pulp |
| 11/15/1990 | WO1990013705A1 Ozone treatment of chlorine dioxide/chlorine chlorinated pulp |
| 11/14/1990 | EP0397308A2 Method of bleaching cellulose pulp with ozone |
| 11/13/1990 | US4969976 Pulp dewatering process |
| 11/11/1990 | WO1990013344A1 Method of and apparatus for treating pulp |
| 11/11/1990 | CA2054727A1 Method of and apparatus for treating pulp |
| 11/07/1990 | EP0395792A2 Procedure for the bleaching of pulp |
| 11/06/1990 | CA1275789C Water absorbent fibrous product and a method of producing the same |
| 11/06/1990 | CA1275759C Method and apparatus for alkaline delignification of lignocellulosic fibrous material |
| 11/01/1990 | WO1990012919A1 Dewatering device |
| 10/31/1990 | EP0395588A1 Dibenzofuranylbiphenyls |
| 10/31/1990 | EP0395236A1 Pump for separating gas from a fluid to be pumped |
| 10/31/1990 | CN1046576A Pulp washing apparatus and process |
| 10/30/1990 | CA1275593C Arrangement for liquid treatment of pulp |
| 10/16/1990 | CA1275152C Preparation of modified cellulose to impart improved absorbant properties to the product |
| 10/09/1990 | US4961326 Material processing system |
| 10/08/1990 | WO1990012146A1 A process for treating a fiber pulp with a chemical solution |
| 10/08/1990 | WO1990011809A1 A process and apparatus for continuous filtering and liquid displacement of a liquid suspension of a fibrous or finely-divided material |
| 10/08/1990 | CA2049951A1 Process for treating a fiber pulp with a chemical solution |
| 10/04/1990 | WO1990011403A1 Bleaching process for the production of high bright pulps |
| 10/02/1990 | CA1274802A1 Oxygen bleaching of lignocellulose |
| 10/02/1990 | CA1274655A1 Process for the bleaching of ns-aq or sap pulp |
| 09/25/1990 | US4959124 Method of bleaching kraft pulp in a DZED sequence |
| 09/20/1990 | WO1990010527A1 Method and apparatus for extrusion processing of wood products and fibrous materials |
| 09/18/1990 | US4957599 Alkaline extraction, peroxide bleaching of nonwoody lignocellulosic substrates |
| 09/15/1990 | WO1990010750A1 Method and apparatus for washing cellulosic pulp |
| 09/15/1990 | CA2028823A1 Method and apparatus for washing cellulosic pulp |
| 09/12/1990 | EP0387187A2 Process for reducing the pitch content in pulpwood |
| 09/12/1990 | EP0386888A2 Oxygen delignification and enzyme treatment |
| 09/12/1990 | CN1045285A Process for producing news print and cultural paper by removing the black skin of cotton stem and using whole cotton stem |
| 09/11/1990 | US4956051 Antisticking agents, paper, hot melt adhesives, pressure sensitive adhesives |
| 09/11/1990 | US4956048 Method of alcohol washing brownstock pulp prior to a chlorination bleaching stage |
| 09/11/1990 | CA1273756A1 Chemical pulp treatment by means of hydrogen peroxide leading up to bleaching |
| 09/11/1990 | CA1273755A1 Process for the preparation of chemical pulp prior to bleaching |
| 09/07/1990 | WO1990010109A1 Pulp washing apparatus and process |
| 09/05/1990 | EP0198825B1 Pulp washer |
| 09/03/1990 | WO1990010110A1 Method and apparatus for thickening fiber suspension |
| 09/03/1990 | CA2047749A1 Method and apparatus for thickening fiber suspension |
| 08/29/1990 | EP0383999A2 Procedure for the bleaching of pulp |
| 08/28/1990 | US4952314 Apparatus for treating pulp |
| 08/28/1990 | US4952278 High opacity paper containing expanded fiber and mineral pigment |
| 08/28/1990 | US4952276 Determining the intensity of light emission |
| 08/28/1990 | US4951879 Liquid distribution device |
| 08/23/1990 | CA2009328A1 Pulp washing apparatus and process |
| 08/21/1990 | US4950403 Screen segment for filters for thickening fiber suspensions |
| 08/21/1990 | US4950361 Process for controlling pitch deposits in the pulp and papermaking processes with zirconium (IV) compound |
| 08/16/1990 | EP0382259A2 A complex of a fibrous material and fungi and a process for its preparation |
| 08/16/1990 | EP0381965A2 Method and device for the production of fibrous material containing ligno-cellulose in the production of fibre boards by the dry process |
| 08/16/1990 | DE3841018A1 Dewatering device |
| 08/08/1990 | CN1009119B Pure flax tissue paper for making fuse |
| 08/07/1990 | US4946556 Without bleaching with chlorine |
| 08/07/1990 | US4946555 Apparatus and method for measuring vent gas flow rates and parameters in pulp and paper processing |
| 08/07/1990 | CA1272354A1 Methods for producing low fines content pulp |
| 08/01/1990 | EP0379858A2 Process for bleaching fibre stock for making paper |
| 07/31/1990 | US4944842 Method for reducing contamination in pulp processing |
| 07/31/1990 | US4944167 Pulp treating apparatus |
| 07/31/1990 | CA1272309A1 Process for the decolorization of pulp mill process streams |
| 07/27/1990 | CA2008678A1 Process for bleaching paper stock |
| 07/25/1990 | EP0280094B1 Filter segment for a filter for thickening a fibrous suspension |
| 07/20/1990 | WO1990008221A1 A method in the manufacture of cellulose pulp |
| 07/20/1990 | CA2045497A1 Method in the manufacture of cellulose pulp |
| 07/18/1990 | EP0377981A2 Process for improved alkaline oxidative delignification of cellulose pulp |
| 07/12/1990 | WO1990007466A1 Ozone generation by corona discharge at elevated pressures |
| 07/11/1990 | EP0377427A2 Double diffuser with backflush pistons |
| 07/11/1990 | EP0226114B1 Process for bleaching and delignification of cellulosic products |
| 07/04/1990 | EP0376639A2 Filter deck assembly |
| 07/04/1990 | EP0376446A2 Three-roll thickener for pulp and paper stock, and use thereof |
| 07/04/1990 | EP0375800A1 Process for scale inhibition for kraft digesters |
| 07/03/1990 | US4938843 Screening |
| 07/03/1990 | US4938842 High consistency peroxide bleaching |
| 07/03/1990 | US4938038 Material processing system |
| 06/27/1990 | EP0374700A2 Process for preparing mechanical pulp and for paper containing said pulp |
| 06/27/1990 | EP0215781B1 A deaeration tank and installation using the tank |
| 06/26/1990 | US4936118 Material processing system |
| 06/26/1990 | CA1270607A1 Detackification of adhesive materials contained in secondary fiber |
| 06/23/1990 | CA2005599A1 Hydrogen peroxide bleaching process |
| 06/20/1990 | EP0374057A2 Process for bleaching deinked pulp |
| 06/20/1990 | CA2005369A1 Process for improved alkaline oxidative delignification of cellulose pulp |
| 06/19/1990 | CA1270354A1 Method for improving brown stock washer efficiency |
| 06/14/1990 | WO1990006396A1 Method of and device for fractionating suspensions |
| 06/14/1990 | WO1990006395A1 Apparatus for continuous processing of pulp |