| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 06/08/1993 | US5217574 Process for oxygen delignifying high consistency pulp by removing and recycling pressate from alkaline pulp |
| 06/08/1993 | CA1318865C Stabilizing pressure and flow conditions in a screening apparatus |
| 06/02/1993 | CN1072746A Method for producing high-efficiency bleaching paper pulp |
| 06/01/1993 | CA1318537C Controlling characteristics of a pulp mat on a pulpy washing surface |
| 05/26/1993 | EP0543175A1 Process for improving the whiteness in the bleaching of pulps with peroxide by the addition of cyanates |
| 05/26/1993 | CN1072469A Process and apparatus for conditioning ozone gas recycle stream in ozone pulp bleaching |
| 05/25/1993 | US5213661 Treatment with oxidized white liquor, recycling waste paper |
| 05/20/1993 | CA2083319A1 Process for improving the degree of whiteness obtained by peroxide bleaching of wood pulp by the addition of cyanates |
| 05/19/1993 | EP0542147A1 Cleaning and bleaching of secondary fiber |
| 05/18/1993 | US5211811 High strength pulp |
| 05/18/1993 | US5211809 Recycled paper |
| 05/13/1993 | WO1993009391A1 Heating arrangement |
| 05/13/1993 | WO1993009285A1 Apparatus and method for washing cellulosic pulp |
| 05/13/1993 | CA2120722A1 Heating arrangement |
| 05/11/1993 | CA1317614C Rotating drum end seal |
| 05/11/1993 | CA1317552C Effective diffuser/thickener screen backflushing |
| 05/05/1993 | EP0540091A1 Wash press modification for oxygen delignification process |
| 05/05/1993 | EP0539381A1 Pulp alkali addition process for high consistency oxygen delignification |
| 04/29/1993 | WO1993008275A1 Thermostable xylanase from a strain of rhodothermus marinus |
| 04/29/1993 | WO1993008144A1 Oxidation process |
| 04/29/1993 | WO1993007961A1 Method and apparatus for mixing a first medium to a second medium and a bleaching process applying said method |
| 04/29/1993 | CA2121339A1 Oxidation process |
| 04/27/1993 | US5205907 Increasing bleaching efficiency by enhancing manganese removal |
| 04/21/1993 | EP0538177A1 Xylanases from Rhodothermus strains and their use in the treatment of liquocellulosic pulp |
| 04/20/1993 | US5203045 Method of treating paper pulp |
| 04/20/1993 | CA1316386C High-consistency pulp tower and method of discharging pulp from the tower |
| 04/15/1993 | WO1993007332A1 Method for enzymatic treatment of lignocellulosic materials, in particular cellulose pulps |
| 04/15/1993 | CA2120949A1 Method for enzymatic treatment of lignocellulosic materials, in particular cellulose pulps |
| 04/14/1993 | EP0536580A1 Application of enzymes and flocculants for enhancing the freeness of paper making pulp |
| 04/14/1993 | CN1070971A Two stage pulp bleaching reactor |
| 04/14/1993 | CN1070970A Oxygen color stripping in secondary fiber recovery |
| 04/14/1993 | CN1070969A Use of wash press for pulp alkali addition process |
| 04/14/1993 | CN1070837A Screen with surface having projections or depressions |
| 04/12/1993 | WO1993007333A1 Method of treating wastewater in pulp bleaching |
| 04/12/1993 | CA2098279A1 Method for treating liquid waste after pulp bleaching |
| 04/07/1993 | EP0535741A1 Process for improving the selectivity in the delignification of a chemical pulp |
| 04/06/1993 | US5200036 Paper with polycationic latex strength agent |
| 04/05/1993 | CA2079730A1 Process for improving delignification selectivity of a chemical papermaking pulp |
| 04/01/1993 | WO1993006299A1 An arrangement and a method for concentrating a suspension |
| 04/01/1993 | WO1993006297A1 A method in ozone bleaching of pulp |
| 04/01/1993 | WO1993006296A1 Reaction tank |
| 04/01/1993 | CA2120010A1 An arrangement and a method for concentrating a suspension |
| 04/01/1993 | CA2116974A1 A method in ozone bleaching of pulp |
| 03/25/1993 | DE4231305A1 Printing paper having coating contg. fine cellulose@ powder - giving good ink absorption, fixing and texture, good feel and oil absorption capacity |
| 03/24/1993 | EP0533349A1 Separator screen |
| 03/23/1993 | CA1314664C Ligno-cellulose material ozone treatment process, specially for paper pulf; and reactor for its implementation |
| 03/18/1993 | WO1993005384A1 A method and arrangement for determining fibre properties by near-infrared-spectroscopy |
| 03/18/1993 | WO1993004772A1 A method and device for treating fibre material |
| 03/18/1993 | WO1993004758A1 Defoamer composition |
| 03/18/1993 | CA2116456A1 A method and arrangement for determining fibre properties by near-infrared-spectroscopy |
| 03/17/1993 | EP0495836B1 Dye transfer inhibition |
| 03/10/1993 | EP0530881A1 Use of wash press for pulp alkali addition process |
| 03/04/1993 | WO1993004233A1 Liquid removal apparatus and method for wood pulp |
| 03/04/1993 | WO1993004231A1 Process for gas phase delignifying wood pulp |
| 03/04/1993 | CA2116014A1 Process for gas phase delignifying wood pulp |
| 03/03/1993 | EP0529326A1 Process for the degradation of lignin by means of dioxiranes |
| 03/03/1993 | EP0327576B1 Process for producing cellulose from lignin-containing raw materials |
| 03/03/1993 | CN1069539A Biobleaching process |
| 03/02/1993 | US5190563 Crosslinking cellulose fibers with polycarboxylic acids, separation and drying |
| 03/02/1993 | CA1313967C Double diffuser with backflush pistons |
| 03/01/1993 | CA2077092A1 Process for the degradation of lignin by means of dioxiranes |
| 02/25/1993 | DE4128084A1 Beta-alanine-N,N-di:acetic acid, alkali or ammonium salt complex former in paper mfr. - useful for biodegradable alkaline earth and heavy metal ion complexant in bleaching mechanical wood pulp and printed waste paper de inking |
| 02/24/1993 | EP0527808A1 Bleaching of chemical pulp. |
| 02/24/1993 | CN1069304A Environmentally improved process for bleaching lignocellnlosic materials |
| 02/23/1993 | US5188708 Process for high consistency oxygen delignification followed by ozone relignification |
| 02/23/1993 | US5187956 Preventing clogging in pressure diffusers |
| 02/16/1993 | US5186791 Apparatus for thickening pulp and paper stock |
| 02/16/1993 | CA1313599C Pulp treatment methods |
| 02/15/1993 | CA2075875A1 Use of wash press for pulp alkali addition process |
| 02/03/1993 | EP0526383A1 Process and apparatus for conditioning ozone gas recycle stream in ozone pulp bleaching |
| 02/03/1993 | EP0496782A4 High efficiency chlorine dioxide pulp bleaching process |
| 02/03/1993 | EP0283489B1 Apparatus for treating a material sheet |
| 02/03/1993 | CN1068613A Treating method for black and white liquor of coda pulp |
| 02/02/1993 | US5183707 Absorbent cellulosic material; diapers |
| 02/02/1993 | US5183536 Cellulose |
| 02/02/1993 | CA1313325C Method and apparatus for improving the control and treatment of fibre suspension flow |
| 02/02/1993 | CA1313324C Method and apparatus for thickening fiber suspension |
| 02/02/1993 | CA1313290C Process and plant for the industrial production of a uniflow of stabilized aggregates from lignocellulosic wastes and facility therefor |
| 01/27/1993 | EP0524220A1 A pulping process using cellulase. |
| 01/26/1993 | US5181989 Reactor for bleaching high consistency pulp with ozone |
| 01/20/1993 | EP0524127A2 Improvements in a process for delignifying lignocellulosic pulp by means of oxygen |
| 01/20/1993 | EP0464157A4 Ozone treatment of chlorine dioxide/chlorine chlorinated pulp |
| 01/20/1993 | CN1068162A Oxygen detackification in secondary fiber recovery |
| 01/20/1993 | CN1068161A Removing lignin and bleaching for lignin cellulose-containing material and method for treating waste water by synergetic shellac enzyme |
| 01/13/1993 | EP0522547A2 Carbonyl-containing degradable chelants, uses and compositions thereof |
| 01/13/1993 | EP0287626B1 Control of peroxide bleaching of different pulps |
| 01/13/1993 | CA2073578A1 Carbonyl-containing degradable chelants, uses and compositions thereof |
| 01/12/1993 | US5179021 Pulp bleaching process comprising oxygen delignification and xylanase enzyme treatment |
| 01/07/1993 | WO1993000470A1 Ozone bleaching process |
| 12/30/1992 | EP0520452A1 Batch process for preparing kraft pulp |
| 12/30/1992 | EP0520140A1 Ozone-alkaline extraction bleaching without intermediate washing |
| 12/30/1992 | CN1067462A Ammonium sulfite process for production of cotton pulp |
| 12/29/1992 | US5174861 Chlorine-free |
| 12/23/1992 | WO1992022703A1 Washer |
| 12/23/1992 | WO1992022702A1 Drum washer |
| 12/23/1992 | CA2109574A1 Washer |
| 12/23/1992 | CA2109573A1 Drum washer |
| 12/22/1992 | US5173153 Process for enhanced oxygen delignification using high consistency and a split alkali addition |
| 12/22/1992 | CA1311640C Liquid treatment of and liquid extraction on a paper pulp |
| 12/17/1992 | DE4218174A1 Fluid extraction equipment |