| Patents for D21D 5 - Purification of the pulp suspension by mechanical means; Apparatus therefor (4,157) |
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| 12/06/1989 | CN2048870U Pressure pulp screen |
| 12/05/1989 | US4885090 Papermaking pressure screening |
| 12/05/1989 | US4885057 By a concentrator with a rotary filter bed, pressing the slurry, water-washing and dispersing |
| 11/30/1989 | WO1989011560A1 A device for discharging a reject from a separation device |
| 11/28/1989 | CA1263340A1 Means for clearing the blocked reject end of a vortex purifier |
| 11/21/1989 | CA1263099A1 Twin hydrocyclone |
| 11/14/1989 | US4880540 Pulp screening apparatus |
| 11/14/1989 | US4880532 Sorting apparatus for fiber suspensions |
| 11/08/1989 | CN2047270U Suspension type paper-pulp dregs remover |
| 11/02/1989 | EP0340189A2 Hydrocyclone divided into sections |
| 10/31/1989 | US4877424 Method and apparatus for separating solids from a solids-gas mixture |
| 09/27/1989 | EP0334312A2 Method and apparatus for improving the operation of a disc filter |
| 09/27/1989 | CN2044992U Device for removing rubber residues |
| 09/26/1989 | CA1261182A1 Method for treating stock for paper making |
| 09/26/1989 | CA1260433A1 Vortex cleaner |
| 09/13/1989 | EP0332123A2 A device for screening pulp and a blade for the screening device |
| 09/13/1989 | EP0331883A2 Pressure knotter screening apparatus |
| 09/13/1989 | EP0205623B1 Pressure slit screen |
| 09/05/1989 | US4863605 Hydrocyclone with parallel rotor vanes and annular ring members |
| 08/30/1989 | EP0330387A2 Improved method and apparatus for processing pulp |
| 08/17/1989 | DE3804006A1 Method for the removal of sticky contaminants during waste paper stock preparation |
| 08/16/1989 | EP0327784A1 Means and method for removal of strings |
| 08/08/1989 | US4855038 High consistency pressure screen and method of separating accepts and rejects |
| 07/27/1989 | WO1989006719A1 Screen plate |
| 07/25/1989 | US4851111 Apparatus for screening paper fiber stock |
| 07/25/1989 | CA1257849A1 Screening apparatus for fiber suspensions |
| 07/18/1989 | US4849096 Cleaning arrangement for suspensions |
| 07/18/1989 | CA1257565A1 Hydrocyclone plant |
| 07/12/1989 | EP0323749A2 Method and means for facilitating the discharge of a drop leg or the like and treating pulp in said space |
| 07/11/1989 | US4846971 Sieves for scrubbers and their method of manufacture |
| 06/27/1989 | US4842722 Pressure sorter |
| 06/07/1989 | EP0318756A1 Process and device for removing ashes |
| 06/07/1989 | EP0318495A1 Apparatus for treatment of fibre suspensions. |
| 06/06/1989 | US4836915 High flow capacity barrier type screening apparatus |
| 05/30/1989 | CA1254732A1 Drilling mud comprising a high surface area magnetite concentrate |
| 05/24/1989 | EP0316570A2 Screen drum and method of manufacturing same |
| 05/24/1989 | DE3738746A1 Sieve basket and method for its production |
| 05/23/1989 | US4832832 Pressure type slit screen |
| 05/10/1989 | EP0315388A2 Method and apparatus for treating fiber suspension |
| 05/09/1989 | US4828689 Purifier screen of non-welded manufacture |
| 04/19/1989 | EP0312273A2 Method and apparatus for treating fiber suspension |
| 04/04/1989 | US4818339 Discharging into large vat where it is stirred by an agitator equipped with spiral arms |
| 04/04/1989 | CA1251904A1 Method for producing improved high-yield pulps |
| 03/21/1989 | CA1251404A1 Apparatus for separating gas from a fibre suspension |
| 03/14/1989 | US4812229 With spaced depressions having angled slits in base; for screening fiber suspensions in paper making |
| 03/08/1989 | EP0306022A1 Method and apparatus for grading fiber suspension |
| 02/14/1989 | US4804439 Means and method for removal of strings from waste paper |
| 01/18/1989 | EP0299258A1 A high flow capacity barrier type screening apparatus and method therefor |
| 01/12/1989 | DE3821453A1 Screening apparatus for separating off cellulose fibres from a suspension liquid stream and for introducing the particles into another liquid stream under superatmospheric pressure |
| 01/11/1989 | EP0298949A2 Combined fluidizing and vacuum pump |
| 01/11/1989 | EP0298443A1 Method and apparatus for keeping a screen or filter surface clear |
| 01/10/1989 | US4797203 Reverse hydrocyclone cleaner for removing light contaminants from pulp slurry |
| 01/04/1989 | EP0297386A2 Hydrocyclone |
| 01/04/1989 | CN2030204U Medium-density pressure sifter with moveable sieve-mesh |
| 01/03/1989 | US4795560 Screen plates |
| 12/29/1988 | WO1988010335A1 An apparatus for screening pulp and a method of screening a pulp suspension |
| 12/21/1988 | CN88201891U Moving screen for screening the pulp |
| 12/15/1988 | WO1988009843A1 Pulp screening apparatus |
| 12/14/1988 | EP0294832A2 Pulp screening apparatus |
| 11/30/1988 | EP0138865B1 An arrangement for cyclone assemblies for cleaning liquid suspensions |
| 11/29/1988 | CA1245600A1 Medium consistency flat disk pressure screen |
| 11/22/1988 | CA1245089A1 Latency removal |
| 11/15/1988 | US4784761 Drum screen |
| 11/02/1988 | EP0289020A2 Method and apparatus for treating fiber suspension |
| 11/01/1988 | CA1243986A1 Apparatus for fractionating fiber suspensions |
| 10/19/1988 | EP0287408A1 Filter screens |
| 10/19/1988 | EP0287267A2 Cylindrical Screen Plates |
| 10/12/1988 | EP0286535A1 Screens for paperstock cleaners |
| 10/11/1988 | US4776957 Rotating element for a screening apparatus with a contour surface |
| 10/11/1988 | US4776951 Screening apparatus for fiber suspensions |
| 10/11/1988 | US4776926 Thinning, agitation, separation into fine and long fiber fractions of varying freeness |
| 10/11/1988 | US4776758 Combined fluidizing and vacuum pump |
| 09/27/1988 | US4773989 Process for the preparation of fibrous suspensions in hydrocyclones |
| 08/31/1988 | EP0280094A2 Filter segment for a filter for thickening a fibrous suspension |
| 08/30/1988 | CA1241298A1 Disk screen shaft assemblies and method of and means for manufacturing the same |
| 08/17/1988 | EP0278260A2 Screening apparatus |
| 08/16/1988 | US4764277 Pulp slurry separator with parallel slots; scraper blade to prevent clogging |
| 08/16/1988 | CA1240621A1 Device for a rotary filter |
| 07/27/1988 | EP0275967A2 Method and apparatus for separating knots |
| 07/27/1988 | EP0275921A2 Cleaning foil |
| 07/20/1988 | EP0274690A1 Method and apparatus for thickening fiber suspension |
| 06/29/1988 | EP0273020A2 Means for defibrating and sorting pulp in paper and cellulose industry |
| 06/29/1988 | EP0273019A2 Means for defibrating and sorting pulp in paper and cellulose industry |
| 06/29/1988 | EP0273018A2 Means for defibrating and sorting pulp in paper and cellulose industry |
| 06/28/1988 | CA1238604A1 Rotary pulp screen of the vertical pressure type having pulp stock feed at different axial positions on the screen |
| 06/21/1988 | CA1238283A1 Rotatable disc filter |
| 06/14/1988 | CA1238014A1 Method and apparatus for fractionating a mixture of particles of different sizes suspended in a liquid |
| 06/07/1988 | US4749475 Two stage rotary pulp screening device |
| 06/07/1988 | US4749474 Screening apparatus |
| 06/01/1988 | EP0269124A2 High-consistency pulp tower for discharging said pulp |
| 05/19/1988 | DE3638408A1 Process for separating interfering materials and reusable accepted stocks, in particular usable fibres, from liquids containing added solids, and apparatus for carrying out the process |
| 05/19/1988 | DE3638371A1 Process for separating solids contained in a liquid, in particular solids contained in waste waters, and an apparatus for carrying out the process |
| 05/18/1988 | EP0267327A1 Pressure screen for fibre suspensions |
| 05/17/1988 | US4744894 Fibrous stock screening apparatus |
| 05/17/1988 | CA1236794A1 Feed and accept duct system for hydrocyclones |
| 05/03/1988 | CA1236051A1 Sorting screen |
| 04/21/1988 | DE3733928A1 Sichtervorrichtung Sichtervorrichtung |
| 04/12/1988 | US4737274 Tramp material separator |
| 04/06/1988 | EP0262568A2 Cyclone |
| 03/30/1988 | EP0261117A1 A rotating element for a screening apparatus with a contour surface. |