| Patents for D21D 5 - Purification of the pulp suspension by mechanical means; Apparatus therefor (4,157) |
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| 03/23/1988 | EP0261025A1 Process and apparatus for treating printed waste paper |
| 03/22/1988 | EP0215781A4 A deaeration tank and installation using the tank. |
| 03/08/1988 | US4729837 For pulp |
| 02/11/1988 | WO1988000992A1 Apparatus for treatment of fibre suspensions |
| 02/09/1988 | CA1232587A1 Reverse centrifugal cleaning of paper making stock |
| 02/09/1988 | CA1232575A1 Strainer assembly for pulp and the like |
| 01/20/1988 | EP0253006A1 Pressure separator |
| 01/14/1988 | DE3721207A1 Perforated plate for wire drums |
| 01/05/1988 | US4717471 Apparatus for screening paper fiber stock |
| 12/29/1987 | CA1230768A1 Process and apparatus for cleaning chemical cellulose pulp by screening |
| 12/01/1987 | US4710287 Having rotationally symmetric screen |
| 11/25/1987 | CN86104281A Vertical pulp thickener |
| 11/03/1987 | US4704201 Waste paper processing system |
| 11/03/1987 | CA1228763A1 Deaerated liquid stock supply |
| 10/28/1987 | CN87102884A Dryer felt run |
| 10/20/1987 | CA1228256A1 Process for preparing groundwood pulp as short fiber and long fiber fractions |
| 10/13/1987 | US4699324 Combined screening and reject reduction |
| 10/08/1987 | WO1987005954A1 Method of processing mechanical pulp |
| 10/08/1987 | DE3701400A1 Sorting device for fibre suspensions |
| 10/06/1987 | US4697982 Rotary pulp screen of the horizontal type having pulp stock feed at different axial positions on the screen |
| 09/29/1987 | US4697060 Electronic beam welding method for screen cylinder |
| 09/29/1987 | US4696737 Fiber recovery elutriating hydrocyclone |
| 09/22/1987 | US4695381 Filter for continuous filtering of a suspension under pressure |
| 09/16/1987 | EP0236843A2 Sorting screen |
| 09/11/1987 | WO1987005233A1 Fiber recovery elutriating hydrocyclone |
| 09/09/1987 | EP0235605A2 Screening apparatus for paper pulp |
| 09/02/1987 | EP0234101A1 A reverse hydrocyclone cleaner for removing light contaminants from pulp slurry |
| 08/26/1987 | EP0233517A2 Process and apparatus for deinking paper pulp obtained from waste paper |
| 08/19/1987 | EP0232757A1 Method for treating sythetic pulp particles, and pulp particles composed of synthetic polymer |
| 08/12/1987 | EP0232128A2 Filtering devices |
| 08/11/1987 | US4686005 Method of washing stock suspensions by removing undesired material through an endless revolving wire |
| 08/11/1987 | CA1225369A1 Rotor with separate clearing and propelling blades in a turbulence relieved pulp screen |
| 08/04/1987 | US4684444 Sorter for paper pulp suspensions including a damping chamber |
| 08/04/1987 | US4684442 For paper pulp |
| 07/30/1987 | WO1987004474A1 Screen cylinder |
| 07/14/1987 | US4680108 Paper pulp |
| 07/07/1987 | US4678574 Disc filter |
| 06/30/1987 | US4676903 Screening apparatus |
| 06/30/1987 | US4676809 Hydrocyclone plant |
| 06/23/1987 | US4675033 Apparatus for separating gas from a fibre suspension |
| 06/23/1987 | CA1223219A1 Hydrocyclone |
| 06/23/1987 | CA1223216A1 Drum filter assembly for extracting filtrate from a fiber suspension |
| 06/09/1987 | US4671878 Means for clearing the blocked reject end of a vortex purifier |
| 05/26/1987 | CA1222220A1 Reverse centrifugal cleaning of paper making stock |
| 05/21/1987 | WO1987003024A1 Straining means |
| 05/20/1987 | CN86205512U Rippleless inner-flow pressure sieve |
| 05/12/1987 | CA1221660A1 Longitudinally nesting hydrocyclone units with integral plenum chamber modularity |
| 05/12/1987 | CA1221659A1 Hydrocyclone featuring hydraulic jump in overflow passage |
| 05/05/1987 | US4663030 For papermaking stock |
| 04/28/1987 | US4661255 Coarse and fine filter layer of natural and synthetic fibers |
| 04/14/1987 | US4657678 Twin hydrocyclone |
| 04/14/1987 | US4657636 High density pulp screening apparatus |
| 04/08/1987 | EP0160069B1 Rotatable disc filter |
| 04/01/1987 | EP0215781A1 A deaeration tank and installation using the tank. |
| 03/31/1987 | US4653648 Disk screen or like shaft assemblies and method of making the same |
| 03/26/1987 | WO1987001624A1 Drum screen |
| 03/19/1987 | DE3630358A1 Classifier for fibre suspensions |
| 03/17/1987 | US4650570 Strainer assembly for pulp |
| 03/17/1987 | US4650125 Method for sorting fiber stock, especially for manufacturing paper, and sorting apparatus for the performance of such method |
| 03/10/1987 | US4648970 Easy removal of filter cakes |
| 03/04/1987 | EP0212785A1 Apparatus for screening paper fiber stock |
| 03/03/1987 | US4646979 Apparatus for cleaning fibrous suspensions |
| 03/03/1987 | CA1218549A1 Flow distributer |
| 02/25/1987 | EP0211739A1 Process and apparatus for preparing and the primary sorting of paper pulp |
| 02/10/1987 | US4642189 Rotary screen of the vertical pressure type having pulp stock feed at different axial positions on the screen |
| 02/10/1987 | US4641790 System for wastepaper processing using a wash filter |
| 01/20/1987 | US4637878 Reciprocal movable screens in a vertically elongated vessel |
| 01/14/1987 | EP0207937A1 Method and apparatus for processing material suspensions |
| 01/13/1987 | CA1216527A1 Apparatus for removing a fiber layer from a rotating disc filter |
| 01/07/1987 | EP0207340A2 Screening apparatus, particularly for screening pulp suspensions for paper making |
| 01/06/1987 | US4634529 Rotatable disc filter |
| 01/06/1987 | US4634521 Fiber bundles used in papermaking |
| 12/30/1986 | EP0206975A2 High consistency pressure screen and method of separating accepts and rejects |
| 12/30/1986 | EP0205623A1 Pressure slit screen |
| 12/30/1986 | CA1215943A1 Screen plate |
| 12/17/1986 | CN86103397A High consistency pressure screen and method of separating accepts and rejects |
| 12/04/1986 | WO1986007105A1 A rotating element for a screening apparatus with a contour surface |
| 12/03/1986 | EP0203295A1 Screening apparatus |
| 11/12/1986 | CN86101566A Shaft assembly similar to disc sifter and its manufacture |
| 11/11/1986 | US4622132 Liquid cyclone or centrifugal cleaner |
| 10/29/1986 | EP0199495A2 Liquid cyclone or centrifugal cleaner |
| 10/28/1986 | US4619761 Multistage; particles in fluid suspension |
| 10/22/1986 | EP0198787A2 Disk screen or like shaft assemblies and method of making the same |
| 10/22/1986 | CN85103230A Disk screen shaft assemblies and method of and means for manufacturing the same |
| 10/15/1986 | CN85102806A Disk screen equipment, disk assembly and method |
| 10/14/1986 | US4617114 Vortex cleaner for cleaning and deaerating paper pulp suspensions |
| 10/14/1986 | CA1212649A1 Method and apparatus for separating coarse particles from a liquid |
| 10/14/1986 | CA1212648A1 Cyclone separator with down going axial discharge for light components |
| 10/09/1986 | WO1986005708A1 A deaeration tank and process for using the tank |
| 09/23/1986 | US4613432 Pulp screen |
| 09/23/1986 | CA1211746A1 Device for flushing obstructions from the reject head of a centrifugal separator |
| 09/17/1986 | EP0194332A1 Process and apparatus for sorting a fibre suspension |
| 08/26/1986 | US4608174 Feed and accept duct system for hydrocyclones |
| 08/19/1986 | US4606789 Method for manufacturing cellulose pulp using plural refining and fiber separation steps with reject recycling |
| 08/12/1986 | US4605495 Hydrocyclone separator apparatus |
| 08/05/1986 | US4604193 Recycling |
| 08/05/1986 | CA1209097A1 Hydrocyclone separator with turbulence-generating opposing screw threads |
| 07/30/1986 | EP0131597B1 Hydrocyclone |
| 07/22/1986 | US4601819 Higher consistency fiber stock |
| 07/16/1986 | EP0187553A1 Strainers for paper pulp purification, and purifiers containing these strainers |