| Patents for D21B 1 - Fibrous raw materials or their mechanical treatment (6,805) |
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| 11/17/1981 | CA1112494A1 Pulping machine and process |
| 11/03/1981 | US4298425 Method and apparatus for refining lignocellulose-containing material to produce fiber pulp |
| 10/27/1981 | US4297322 Equipment for treating and resource recovery from solid waste |
| 10/20/1981 | US4295927 Method and apparatus for treating pulp with oxygen and storing the treated pulp |
| 10/20/1981 | US4295926 Method and apparatus for treating pulp with oxygen |
| 10/20/1981 | US4295925 Treating pulp with oxygen |
| 10/14/1981 | EP0037513A1 Flotation apparatus for deinking fibrous suspensions |
| 10/13/1981 | US4294653 Digestion, delignification, defibering |
| 10/13/1981 | US4294412 Method and apparatus for controlling wood pulp grinding machines |
| 10/13/1981 | CA1110480A1 Process for the preparation of groundwood pulp |
| 10/06/1981 | CA1110205A1 Sorting apparatus containing serial removal devices for a stock suspension obtained from waste paper |
| 09/29/1981 | US4292122 Bonding properties of mechanical pulps |
| 09/16/1981 | EP0035839A2 Apparatus and method for defibering stock material |
| 09/15/1981 | US4289579 Method for treating a bulk material with a fluid |
| 09/15/1981 | CA1108969A1 Method and apparatus for rechipping wood chips |
| 09/08/1981 | US4288319 Method of and arrangement for de-inking fiber |
| 09/08/1981 | US4288288 Apparatus for mixing chemicals into pulp at a refiner inlet |
| 09/01/1981 | CA1107941A1 Method of refining of fibre material |
| 09/01/1981 | CA1107916A1 Method of treating waste paper for obtaining a stock suspension for the production of new paper and apparatus for the performance of the aforesaid method |
| 08/26/1981 | EP0034560A2 Method and apparatus for efficiently producing cellulosic pulp by the thermo-mechanical pulping method |
| 08/26/1981 | EP0034382A2 Method of separating paper and plastics pieces and separating means therefor |
| 08/25/1981 | US4285373 Crushing apparatus |
| 08/18/1981 | US4284247 Apparatus for defibrating and conditioning nonflowable cellulosic material |
| 08/18/1981 | US4284120 Method and device for transfer of fiber materials transportable by liquids |
| 08/18/1981 | CA1107113A1 Coaxial feeder |
| 08/18/1981 | CA1107112A1 Method and apparatus for controlling the effect of the centrifugal force on the stock in pulp defibrating apparatus |
| 08/11/1981 | US4283275 Apparatus for processing waste paper |
| 08/11/1981 | US4283252 Method and apparatus for producing fiber pulp from fibrous lignocellulose containing material |
| 08/11/1981 | US4283016 Method and apparatus for controlling the effect of the centrifugal force on the stock in pulp defibrating apparatus |
| 07/28/1981 | US4280868 Method for refining lignocellulose-containing material |
| 07/28/1981 | CA1105913A1 Installation for the recovery of materials that are present in the solid city wastes for their subsequent utilization and/or their transformation |
| 07/28/1981 | CA1105911A1 Process for the tearing of board and other paper materials also if contained in plastics containers and intermingled with eventual extraneous bodies and machine for the realization of the said process |
| 07/28/1981 | CA1105660A1 Solvent vapor extraction of wood |
| 07/14/1981 | CA1104855A1 Method and device for use in the manufacture of fibre pulp from lignocellulose-containing material |
| 07/07/1981 | US4277328 Flotation apparatus for separating impurities from a fiber suspension |
| 07/07/1981 | CA1104402A1 Refiner |
| 07/07/1981 | CA1104401A1 Apparatus for processing waste paper |
| 06/23/1981 | US4274786 Process and apparatus for continuously conveying particulate compressible fibrous material from a zone at a first gas pressure to a zone at a second gas pressure |
| 06/23/1981 | US4274600 Method of and a grinder for grinding wood under pressure |
| 06/23/1981 | CA1103606A1 Method and apparatus for supplying wood fiber material to a pulp paper plant through a single off- loading station |
| 06/23/1981 | CA1103413A1 Process for the manufacture of mechanical pulp |
| 06/16/1981 | CA1103145A1 Apparatus for conveying strip-formed material |
| 06/09/1981 | US4272315 Recovering paper wastes |
| 06/02/1981 | US4270976 Defibration in grinding space between rotating disks in pressurized steam |
| 06/02/1981 | US4270703 Method of and a grinder for discharging groundwood stock when grinding wood under pressure |
| 06/02/1981 | CA1102159A1 Method and apparatus for controlling the effect of the centrifugal force on the stock in pulp defibrating apparatus |
| 06/02/1981 | CA1102158A1 Method and apparatus for controlling the refining of fibrous lignocellulose pulp material |
| 05/27/1981 | EP0029271A1 Stuff grinder |
| 05/26/1981 | CA1101718A1 Method and apparatus for making pulp |
| 05/20/1981 | EP0028658A1 Process and apparatus for treating waste paper |
| 05/20/1981 | EP0028596A1 A method and an arrangement for storing organic fibrous material in a stack |
| 05/19/1981 | CA1101257A1 Method and apparatus in pulping |
| 05/14/1981 | WO1981001303A1 A method for controlling a piston fed wood grinder |
| 05/12/1981 | CA1100911A1 Imbricated entangling conveyors separating plastic film from a refuse conveyor |
| 05/06/1981 | EP0027817A1 Baled wastepaper product containing a deinking chemical |
| 04/28/1981 | CA1099858A1 Recovery of fibre from laminated carton boards |
| 04/21/1981 | CA1099456A1 Process for simultaneously drying mechanical wood pulp and improving mechanical strength and brightness of the pulp |
| 03/31/1981 | US4259148 Wetting surfaces of wood particles with solution of sulfite followed by heating with steam |
| 03/31/1981 | CA1098353A1 Method and apparatus for recovering paper fiber from waste paper containing materials |
| 03/24/1981 | US4257563 Apparatus and process for producing wood pulp in a pressurized wood grinder |
| 03/24/1981 | CA1098101A1 Method for improving fibrous matter recovered from refuse |
| 03/10/1981 | US4254874 Device for collecting and processing tree stumps |
| 03/10/1981 | CA1097118A1 Method of and a grinder for grinding wood under pressure |
| 03/03/1981 | US4253940 Method and apparatus for separating waste materials |
| 03/03/1981 | US4253613 Method and apparatus for controlling the effect of the centrifugal force on the stock in pulp defibrating apparatus |
| 03/03/1981 | CA1096677A1 Method and apparatus for producing wood pulp in a wood-grinder |
| 03/03/1981 | CA1096676A1 Process and apparatus for improving the properties of a thermomechanical paper pulp |
| 02/24/1981 | US4252640 Apparatus for sorting fibrous stock suspensions |
| 02/24/1981 | US4252279 Method for dry-defibration of chemical, chemi-mechanical and mechanical fiber pulp or mixtures thereof |
| 02/24/1981 | CA1096515A1 Process and installation for eliminating by flotation impurities in the form of solid particles contained in a liquid |
| 02/10/1981 | US4249701 Waste pulping apparatus |
| 01/28/1981 | EP0022929A1 Process for treating timber, including cleaning steps |
| 01/27/1981 | US4247363 Process for producing stone groundwood pulp from wood chips by using a stone grinder |
| 01/27/1981 | CA1094263A1 Method of producing ultra high yield pulp |
| 01/20/1981 | CA1093880A1 Recovery of cellulosic fibres from foil laminated materials |
| 01/07/1981 | EP0020600A1 Process for feeding a shredder with pulp supplied in bales. |
| 01/06/1981 | US4243478 Process for treating waste paper with hardened water |
| 12/30/1980 | US4241881 By feeding in shingled array to fiberizer |
| 12/30/1980 | CA1092549A1 Vortex separator with coaxial inlet and lightweight reject pipelines |
| 12/02/1980 | US4236998 Process and apparatus for purifying a fibrous suspension |
| 12/02/1980 | US4236959 And causing superheating and evaporation by reducing the partial pressure with a noncondensable gas |
| 12/02/1980 | US4236676 Paper sorting apparatus |
| 11/27/1980 | WO1980002573A1 A method and an arrangement for storing organic fibrous material in a stack |
| 11/25/1980 | US4235665 Method and apparatus for producing fiber pulp in a steam pressurized grinding system |
| 11/25/1980 | US4235382 Rotating drum and blade at different speeds |
| 11/18/1980 | US4234379 Process for producing a uniform fiber dispersion and machine made light weight glass fiber web material |
| 11/13/1980 | WO1980002411A1 Baled wastepaper product containing a deinking chemical |
| 11/11/1980 | CA1089427A1 Feeding device especially for pulp bales |
| 11/04/1980 | US4231526 Rough pulping, separation, vibration sorting |
| 11/04/1980 | CA1088790A1 Method of making pulp |
| 10/21/1980 | US4229493 Baled wastepaper product containing a deinking chemical |
| 10/21/1980 | US4229250 Method of improving properties of mechanical paper pulp without chemical reaction therewith |
| 10/21/1980 | US4228964 Apparatus for processing cellulose insulation |
| 10/21/1980 | CA1087811A1 High yield, low cost cellulosic pulp |
| 10/15/1980 | EP0017544A1 Process for preparing a paper pulp |
| 10/14/1980 | US4227965 Production of hardboard |
| 10/14/1980 | US4227653 Method of processing waste materials |
| 10/14/1980 | CA1087581A1 Process and apparatus for the continuous preparation of insulating material of a fiber material and a powdery fireproof making substance |
| 10/01/1980 | EP0016743A1 Method and apparatus for controlling the effect of the centrifugal force on the stock in pulp defibrating apparatus |
| 09/30/1980 | US4225427 Sorting apparatus for a stock suspension obtained from waste paper |