| Patents for D21B 1 - Fibrous raw materials or their mechanical treatment (6,805) |
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| 06/14/1990 | WO1990006394A1 Device for chip washing |
| 06/06/1990 | EP0371066A1 Method and apparatus for controlling the production of refined stock. |
| 06/05/1990 | US4930230 Apparatus for the conditioning of bulk material |
| 05/31/1990 | DE3839499A1 Device (tub-grinder) and method for breaking up cellulose-containing materials |
| 05/25/1990 | CA2003768A1 Device for chip washing |
| 05/23/1990 | EP0258352B1 High temperature, high consistency bleaching |
| 05/23/1990 | CN1042390A Method for manufacture of moulded objects from fluidized fibre raw material |
| 05/22/1990 | US4927534 Screen system |
| 05/22/1990 | US4927312 Chip gates with air lock |
| 05/17/1990 | WO1990005208A1 Process for reducing the consumption of energy during the mechanical production of paper pulp |
| 05/15/1990 | CA1268977A1 Electric lathe |
| 05/03/1990 | WO1990004677A1 Manufacture of moulded objects from a fluidized fibre raw material |
| 05/03/1990 | WO1990004673A1 Method at the making of fibre pulp |
| 05/03/1990 | WO1990004672A1 Wood chip cracking apparatus |
| 05/02/1990 | CN1007789B Disc screen with decreasing dap wide and screening method |
| 05/01/1990 | US4921573 Dilution of the dewatered waste paper |
| 04/25/1990 | EP0364516A1 Process for controlling a pulp grinder |
| 04/25/1990 | CA2001295A1 Method for the manufacture of moulded objects from a fluidized fibre raw material |
| 04/25/1990 | CA2001293A1 Method at the making of fibre pulp |
| 04/24/1990 | US4919340 Uniform particle size distribution |
| 04/18/1990 | CN1041413A Semi-chemical wood pulp from shrub mechanical mill and pulping process thereof |
| 04/17/1990 | US4917762 Cutting paper or cellulose pulp, mixing with water and surfactants |
| 04/17/1990 | US4917315 Flared pockets for centrifugal grinders |
| 04/10/1990 | US4915821 Apparatus for treatment of old printed papers with short and long fiber separation |
| 04/04/1990 | EP0360807A1 Device at manufacture of fibre pulp. |
| 04/03/1990 | US4913359 Paper material refining apparatus |
| 04/03/1990 | CA1267293A1 Grinding means for producing mechanical woodpulp |
| 03/28/1990 | EP0360389A1 Method and apparatus in a sheet cutter |
| 03/20/1990 | US4909900 Concurrent heating, bleaching; forcing mixture through narrow slots |
| 03/14/1990 | CN1040343A Method and apparatus in a sheet cutter |
| 03/13/1990 | US4908123 Air separator comprising inlet duct, outlet duct for conveying airbourne stream of shredded paper, discharge duct |
| 03/13/1990 | US4908101 Fixed rotatable horizontal casing with pulp flow channel with guides for shearing pulp |
| 03/13/1990 | US4908099 Packing lignocellulose in pressure vessel, treating with pressurized steam, whereby xylan components are softened, explosively expelling lignocellulose to cause lignin xylan crosslinks in middle lamella and walls to be fractured |
| 03/13/1990 | US4907702 Automatic chip classifier and system |
| 03/08/1990 | WO1990002223A1 A method of treating and a disperger for disintegrating wood pulp, especially containing waste paper |
| 03/06/1990 | CA1266354A1 Process for manufacturing a liquid absorbing pad, in particular for use in soft hygiene articles and sanitary products |
| 02/28/1990 | CN1006992B Process for manufacturing soft hygiene articles and sanitary products |
| 02/27/1990 | US4903845 Machine and method for separating fines from wood chips |
| 02/27/1990 | CA1266152A1 Process for producing high yield bleached cellulose pulp |
| 02/22/1990 | WO1990001371A1 Stress regulator for pulp grinding apparatus and method |
| 02/20/1990 | US4901864 Grooved spacer for disc screen wood chip sorter |
| 02/20/1990 | US4901863 Method and apparatus for sorting wood chips |
| 02/14/1990 | EP0354307A1 Process for the treatment of the short fibre fraction after separation from the long fibre fraction in a secondary fibre mixture in particular for the production of folding box board |
| 02/13/1990 | US4900399 Method of manufacturing bleached chemi-mechanical and semichemical fibre pulp by a two-stage impregnation process |
| 02/08/1990 | DE3826549A1 Method for the production of groundwood, and grinder for carrying out the method |
| 01/30/1990 | US4897155 Method for producing low fines content pulp by subjecting cellulosic chips to low frequency compression-relaxation cycles |
| 01/23/1990 | US4895241 Apparatus for distribution of logs into grinder supply shafts |
| 01/18/1990 | DE3823837A1 Method for the production of groundwood |
| 01/17/1990 | EP0351330A1 Process for manufacturing bleached chemithermomechanical pulps |
| 01/10/1990 | CN1038598A Procedure and apparatus for sorting of wood chips |
| 01/02/1990 | US4891099 Apparatus for secondary fibre processing |
| 01/02/1990 | US4890796 Axial displaceable rotatable shaft; controlling fluid pressure |
| 12/26/1989 | US4889591 Crotalaria juncea paper pulps |
| 12/21/1989 | DE3919610A1 Method and device for sorting wood shavings |
| 12/20/1989 | EP0346559A2 Method of molding using dissociated lignocellulosic material and the product so produced |
| 12/13/1989 | EP0221081B1 Combined hydrostatic/hydrodynamic bearing system for grinding apparatus |
| 12/06/1989 | EP0345234A2 Feeding system for the former of a dry-paper machine |
| 12/05/1989 | US4884943 Method and apparatus for pumping high-consistency fiber suspension |
| 11/29/1989 | CN1037559A Method for producing double gummed paper with full-reed pulp |
| 11/23/1989 | EP0343023A1 Pulper for papermaking pulp |
| 11/23/1989 | EP0342857A2 Waste paper de-inking system |
| 11/16/1989 | WO1989010998A1 Method of making mechanical and chemi-mechanical papermaking pulp |
| 11/14/1989 | US4880532 Sorting apparatus for fiber suspensions |
| 11/14/1989 | US4880171 Apparatus for the production of pulp suspensions |
| 11/14/1989 | CA1262924A1 Combined hydrostatic/hydrodynamic bearing system for grinding apparatus |
| 11/07/1989 | US4878997 Method and apparatus for manufacturing fibre pulp |
| 10/17/1989 | US4874136 Pulp refining apparatus |
| 10/11/1989 | EP0336842A1 Process for producing a paper pulp for fiduciary use |
| 10/11/1989 | EP0336380A2 A method and means for fiberizing shredded fibrous material |
| 10/11/1989 | EP0335870A1 Refiner |
| 10/11/1989 | EP0228396B1 Arrangement for the flocculation of flocculable substances, particularly for the purification of effluents from deinking installations for used paper processing |
| 10/10/1989 | US4872953 Apparatus for improving the quality of paper manufactured from recycled paper with a hydrokinetic amplifier |
| 10/10/1989 | US4872617 Canted, spring-loaded feed screw support |
| 09/28/1989 | DE3808765A1 Apparatus for the dispersion and disintegration of fibrous material |
| 09/26/1989 | US4869783 High-yield chemical pulping |
| 09/26/1989 | CA1261434A1 Method for regulation of grinding process in a pocket grinder |
| 09/21/1989 | DE3808207A1 Production of light mouldings from lignocellulose-containing plant material |
| 09/21/1989 | DE3808152A1 Method for pulping waste paper or cellulose with removal of contraries |
| 09/20/1989 | EP0333398A2 Process for bleaching mechanical wood pulp |
| 09/19/1989 | US4867383 Method and system for processing wastepaper |
| 09/19/1989 | CA1259584A1 Vibratory separation apparatus |
| 09/13/1989 | EP0097716B1 High bulk pulp, filter media utilizing such pulp, related processes |
| 09/12/1989 | US4865690 Process and plant for recycling waste printed papers |
| 09/05/1989 | US4863107 Process and a device for removing foreign solids from pulpers |
| 08/31/1989 | DE3804869A1 Verfahren zur regelung eines holzschleifers Method for control of a wood grinder |
| 08/30/1989 | EP0329694A1 Method of making mechanical pulp |
| 08/29/1989 | US4861165 Method of and means for hydrodynamic mixing |
| 08/24/1989 | WO1989007687A1 Process for controlling a pulp grinder |
| 08/22/1989 | US4858834 Chip slicer improvement |
| 08/22/1989 | US4858756 Container |
| 08/17/1989 | DE3804006A1 Method for the removal of sticky contaminants during waste paper stock preparation |
| 08/16/1989 | EP0328500A2 Device to disintegrate paper, cardboard and the like |
| 08/16/1989 | EP0328067A2 Machine and method for sorting out fines and over-thick wood chips |
| 08/16/1989 | EP0327784A1 Means and method for removal of strings |
| 08/15/1989 | US4857323 Preservative for wood |
| 08/15/1989 | US4857180 Rotating disc screen |
| 08/10/1989 | WO1989007169A1 Process for removing the fibre from a lignocellulose material |
| 08/09/1989 | EP0327469A1 Process for defibrillating lignocellulosic material |
| 08/02/1989 | EP0326507A2 Secondary fibre recycling process |
| 08/02/1989 | EP0326012A2 Apparatus for conditioning bulk material |