| Patents for D21B 1 - Fibrous raw materials or their mechanical treatment (6,805) |
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| 05/07/1991 | CA2073048A1 Method of producing cellulosic pulp |
| 05/01/1991 | CN1051062A Deinking and bleaching secondary fiber |
| 04/30/1991 | US5011091 Cellulose fiberization apparatus |
| 04/25/1991 | WO1991006380A1 Wood particle screen |
| 04/24/1991 | EP0423606A1 Process for the preparation of domestic, industrial or similar waste for the extraction of cellulose materials |
| 04/18/1991 | WO1991005109A1 Apparatus and method for producing a fiber material web |
| 04/17/1991 | CA2027385A1 Method for processing domestic, industrial and other similar waste with the production of a cellulose material |
| 04/16/1991 | US5007985 Method of reducing the energy consumption at the refining of cellulose containing material |
| 04/11/1991 | DE3932347A1 Herstellung chemo-mechanischer und/oder chemo-thermo-mechanischer holzstoffe Chemo-mechanical preparation and / or chemo-thermo-mechanical wood materials |
| 04/04/1991 | WO1991004371A1 Improved plug screw feeder |
| 04/03/1991 | EP0271502B1 Grinding block for a refiner |
| 04/02/1991 | US5004028 For slicing wood chips |
| 03/29/1991 | WO1991005102A1 Process for manufacturing chemo-mechanical and/or chemo-thermo-mechanical wood pulps |
| 03/29/1991 | CA2067129A1 Process for manufacturing chemo-mechanical and/or chemo-thermal-mechanical wood pulps |
| 03/26/1991 | US5002635 Stabilizing peroxide by impregnating chips with magnesium sulfate and sodium silicate |
| 03/26/1991 | US5002633 Conversion of pulp and paper mill waste solids to papermaking pulp |
| 03/26/1991 | CA1281856C Method of reducing the energy consumption at the refining of cellulose-containing material |
| 03/19/1991 | US5000824 Polyethylene pulp |
| 03/19/1991 | US5000823 Method and apparatus for the processing of groundwood pulp to remove coarse particulate lignocellulosic material |
| 03/19/1991 | US5000658 Apparatus for pumping high consistency fiber suspension |
| 03/19/1991 | US5000390 Screening wood chips and reducing their thickness |
| 03/19/1991 | CA1281571C Method at the manufacture of mechanical pulp |
| 03/13/1991 | EP0417063A2 Refiner element pattern achieving successive compression before impact |
| 03/12/1991 | US4999084 Dewaxing, cardboard |
| 03/07/1991 | WO1991002838A1 Process for the re-treatment of mechanical wood pulp |
| 03/06/1991 | WO1991003595A1 The treatment of wood chips |
| 03/06/1991 | CA2064062A1 Treatment of wood chips |
| 02/28/1991 | DE3928058A1 Verfahren zur nachbehandlung von holzschliff A method for post-treatment of wood pulp |
| 02/27/1991 | EP0414602A2 Method and apparatus for removing impurities from paper pulp in pulpers |
| 02/27/1991 | EP0413736A1 Method of making mechanical and chemi-mechanical papermaking pulp. |
| 02/27/1991 | CN2072093U Device for recovering waste paper |
| 02/26/1991 | US4995943 Compression, decompression |
| 02/22/1991 | CA2023693A1 Method and apparatus for removing impurities from paper pulp in pulpers |
| 02/21/1991 | WO1991001816A1 Bar screen having a reciprocating action |
| 02/14/1991 | DE4024561A1 Processing waste paper |
| 02/13/1991 | EP0412833A2 Cellulose fiberization process and apparatus |
| 02/11/1991 | CA2022778A1 Method for processing waste paper |
| 02/10/1991 | CA2009404A1 Cellulose fiberization process and apparatus |
| 02/06/1991 | EP0252915B1 Method at the manufacture of mechanical pulp |
| 02/05/1991 | US4990244 Recycling the components of used single use human waste collecting and/or absorbing products |
| 01/31/1991 | DE3925098A1 Grinder - has wear parts on two rotating sections which are replaceable to extend component life |
| 01/30/1991 | EP0318495B1 Apparatus for treatment of fibre suspensions |
| 01/23/1991 | EP0408875A1 Straining cylinder for screening a watery suspension |
| 01/22/1991 | US4986480 Better properties for given energy input, pulping |
| 01/22/1991 | CA1279305C Comminuting device |
| 01/08/1991 | US4983258 Conversion of pulp and paper mill waste solids to papermaking pulp |
| 01/08/1991 | US4983256 Method for the manufacture of a paper pulp for currency use |
| 01/02/1991 | EP0406225A2 Method and apparatus for feeding a conical refiner |
| 01/02/1991 | EP0239583B1 Method of pretreating pulp with stabilizers and peroxide prior to mechanical refining |
| 12/27/1990 | EP0404647A1 Apparatus of liquid degassing |
| 12/27/1990 | CA1278294C Method for fractionation of lignins from steam exploded lignocellulosics to provide fractions with different, but reproducible properties,and some methods for their interconversions and the products so produced |
| 12/19/1990 | EP0403316A1 Shredding machine |
| 12/19/1990 | EP0403068A2 Improvements in and/or relating to a process for preparing a hydrolysed lignocellulosic material |
| 12/18/1990 | US4977943 Mixing waste paper dissolving slurry and treating gas before floatator treating step, separation of ink and sticky residues, deinking |
| 12/12/1990 | EP0402238A2 Pulper |
| 12/11/1990 | CA1277530C Heat recovery with differentiated multi-flash during production of high yield pulp |
| 12/04/1990 | US4974781 Method and apparatus for preparing paper-containing and plastic-containing waste materials for component fraction separation |
| 11/28/1990 | CN1047300A Improvements in and/or relating to process for preparing hydrolysed lignocellulosic material |
| 11/27/1990 | US4973000 Method and apparatus for determining the contact position in a refiner |
| 11/27/1990 | US4972960 Disk screen with compressible spacers and flanged surrounds |
| 11/27/1990 | US4972959 Compressible ring spacer disk screen |
| 11/22/1990 | EP0398846A2 Deinking apparatus in the constant density section of paper manufacturing plants |
| 11/22/1990 | DE3934772A1 Verfahren zum entfernen von druckfarbe aus altpapier A method for removing waste paper by printing ink from |
| 11/11/1990 | CA2016445A1 Process for preparing a hydrolysed lignocellulosic material |
| 11/06/1990 | CA1275760C Method of manufacturing bleached chemimechanical and semichemical fibre pulp by means of a two-stage impregnation process |
| 10/30/1990 | US4966650 Solvent extraction |
| 10/24/1990 | EP0393325A1 Device for removing wire from bales, especially bales of waste paper |
| 10/23/1990 | US4964733 Method of and means for hydrodynamic mixing |
| 10/10/1990 | EP0391042A1 Method of controlling a flotation plant |
| 10/10/1990 | EP0390851A1 An apparatus for shredding fibrous materials such as straw or paper |
| 10/07/1990 | CA2014216A1 Process for controlling a flotation device |
| 10/02/1990 | CA1274657A1 High yield pulping and bleaching process |
| 09/12/1990 | EP0387187A2 Process for reducing the pitch content in pulpwood |
| 09/12/1990 | EP0386998A1 Method and apparatus for separating adhered paper from paper covered gypsum board |
| 09/12/1990 | EP0386082A1 Method and plant for producing high-grade pulp from chip material containing lignocellulose |
| 09/12/1990 | EP0386031A1 Method and device for indicating the contact position in a refiner. |
| 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 | US4955549 Apparatus for treatment of fibre suspensions |
| 09/08/1990 | CA2011708A1 Method and apparatus for separating adhered paper from paper covered gypsum board |
| 09/04/1990 | US4954221 Apparatus for feeding lignocellulose-containing material through a steam screen into a refiner |
| 09/04/1990 | US4953795 Wood chip cracking apparatus |
| 08/29/1990 | EP0262124B1 Rotating separator |
| 08/28/1990 | US4952308 Pressurized flotation module and method for pressurized foam separation |
| 08/22/1990 | EP0383448A2 Method and apparatus for fiberizing and cellulosic product thereof |
| 08/22/1990 | CN1009255B Rotating separator |
| 08/15/1990 | CN1044686A Manufacturing method of liner boards for leather cases by use of mao bamboos (or mu bamboos, sundry bamboos) and accompanied with waste papers, aristate stems, wheatgrasses, rice straws |
| 08/15/1990 | CN1009212B Method of and means for hydrodynamic mixing |
| 08/14/1990 | CA1272563A1 Method of manufacturing bleached chemimechanical and semichemical fibre pulp by means of a one-stage impregnation process |
| 08/07/1990 | US4946024 Procedure and apparatus for separating batches from a stream of logs |
| 08/07/1990 | CA1272354A1 Methods for producing low fines content pulp |
| 07/31/1990 | CA1272056A1 Kneader for paper products and/or similar waste products |
| 07/31/1990 | CA1272004A1 Process and apparatus for removing ink from wastepaper |
| 07/26/1990 | DE3900874A1 Filler material for resilient containers with a flexible wrapping material, and apparatus for the manufacture of such a filler material |
| 07/18/1990 | EP0295239B1 Disk screen improvement for chip screening efficiency |
| 07/18/1990 | CN1043888A Method and apparatus for disintegrating fibrous material |
| 07/03/1990 | US4938423 Paper pulp beater |
| 07/03/1990 | CA1271074A1 Welded conical grinding cutter |
| 06/26/1990 | US4936518 Apparatus for crushing or grinding of fibrous material, in particular drum refiner |
| 06/26/1990 | CA1270687A1 Flared pockets for centrifugal grinders |
| 06/19/1990 | US4935124 Rotatable wood chip classifier |