| Patents for D21D 5 - Purification of the pulp suspension by mechanical means; Apparatus therefor (4,157) |
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| 10/09/1991 | CN2086271U Cylindrical sieve plate for screening machine |
| 10/01/1991 | US5053123 Adjustable valve for varying filtrate composition from filters |
| 09/25/1991 | EP0447887A1 Apparatus for the separation of air from flotation turbid liquids |
| 09/24/1991 | US5051168 Device for screening and treating pulp |
| 09/24/1991 | US5051167 Apparatus for screening a suspension of fibrous cellulose material |
| 09/17/1991 | US5048765 Paper material refining apparatus |
| 09/10/1991 | CA1288733C Apparatus for screening paper fiber stock |
| 09/10/1991 | CA1288732C Apparatus for screening paper fiber stock |
| 09/10/1991 | CA1288731C Fiber recovery elutriating hydrocyclone |
| 09/04/1991 | EP0444985A1 Double diffuser with flexible bellows and internal actuator |
| 09/03/1991 | US5045183 Device for screening fiber suspensions |
| 09/03/1991 | US5045181 Apparatus for removing ash from repulped wastepaper |
| 09/03/1991 | US5044179 Stabilizing pressure and flow conditions in a screening apparatus |
| 08/27/1991 | CA2036694A1 Double diffuser with flexible bellows and internal actuator |
| 08/22/1991 | WO1991012065A1 Apparatus for filtering liquids |
| 08/22/1991 | DE4021350A1 Paper sorting sieve - consists of drum on horizontal axis to divide the tank into two chambers |
| 08/22/1991 | CA2069883A1 Apparatus for filtering liquids |
| 08/20/1991 | US5041214 Wave screen plate |
| 08/20/1991 | US5041213 Pressurized screening device |
| 08/20/1991 | US5041212 Efficiency screen plate for screening pulp |
| 08/17/1991 | WO1991012066A1 Apparatus for filtering liquids |
| 08/17/1991 | WO1991012064A1 Apparatus for filtering liquids |
| 08/17/1991 | WO1991012063A1 An apparatus for filtering suspensions and a method of operating the apparatus |
| 08/17/1991 | CA2069882A1 Apparatus for filtering liquids |
| 08/13/1991 | US5039320 Apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material |
| 08/07/1991 | EP0440455A1 A method and an apparatus for separating gas from a suspension containing gas |
| 08/07/1991 | EP0439479A1 Screen and method of manufacture |
| 08/06/1991 | CA1287327C Pressure type slit screen |
| 07/30/1991 | CA1287018C Method and system for preventing stoppage of apex flow in parallel hydrocyclone arrays |
| 07/24/1991 | EP0438092A1 An apparatus for thickening fibre suspension |
| 07/23/1991 | US5034120 Method for keeping a screen or filter surface clear |
| 07/23/1991 | CA1286637C Screening apparatus for fiber suspensions |
| 07/23/1991 | CA1286636C Liquid cyclone or centrifugal cleaner |
| 07/18/1991 | CA2033920A1 Apparatus for thickening fibre suspension |
| 07/17/1991 | EP0436888A2 Rotor for pressure screens for screening fibre suspensions |
| 07/07/1991 | CA2033577A1 Rotor for pressure sorters for sorting fibrous suspensions |
| 07/03/1991 | WO1991010008A1 Improved efficiency screen plate for screening pulp |
| 07/02/1991 | US5027620 Diffuser with flexible bellows and internal actuator |
| 07/02/1991 | CA1285526C Drum screen |
| 06/28/1991 | WO1991010009A1 Improved wear screen plate and method of manufacture thereof |
| 06/27/1991 | DE3942591A1 Fibre suspension sorting sieve body - has carrier rings with grooves to hold the sieve rods for strength with simple assembly |
| 06/27/1991 | DE3942484A1 Sorting machine with rotation-symmetrical sieve drum - which has several axial bearing points with counter-bearing member |
| 06/25/1991 | US5026486 Method for controlling apex flow in an array of parallel hydrocyclones for cleaning aqueous fiber suspensions |
| 06/19/1991 | EP0432958A1 A method of making a seamless screen cylinder |
| 06/19/1991 | EP0432448A1 Process for making a wedge wire |
| 06/18/1991 | US5024755 Cone wear detection |
| 06/18/1991 | US5023986 Method of manufacturing a wave screen plate |
| 06/10/1991 | CA2030712A1 Process for manufacturing a slotted hole screen |
| 06/05/1991 | EP0429919A2 Arrangements for detecting the wear of a cyclone cone |
| 06/04/1991 | US5020178 Stabilizing pressure and flow conditions in a screening apparatus |
| 05/30/1991 | WO1991008058A1 Disk screen with compressible spacers and flanged surrounds |
| 05/30/1991 | WO1991007231A1 A method for separating fibre suspensions |
| 05/22/1991 | EP0428004A1 Centrifugal washer for paper pulp |
| 05/21/1991 | US5017198 Process for the treatment of material-gas mixtures |
| 05/16/1991 | WO1991006374A1 Improvements in or relating to a centricleaner |
| 05/13/1991 | CA2005848A1 Centrifugal washer for paper pulp |
| 05/08/1991 | CN1051217A Basket profile for screens |
| 05/07/1991 | US5013460 Perforated cylinder |
| 05/02/1991 | EP0424431A1 A method and arrangement for cleansing a fibre suspension from light contaminants |
| 05/01/1991 | WO1991006703A1 Pulseless screen |
| 04/30/1991 | US5011065 Screen basket and method of manufacture |
| 04/25/1991 | DE3935151A1 Recycling paper waste sorter - has structured angle sections to give effective waste separation without fibre loss |
| 04/24/1991 | WO1991005911A1 Basket profile for screens |
| 04/24/1991 | EP0261117B1 A rotating element for a screening apparatus with a contour surface |
| 04/23/1991 | US5009774 Pulseless screen |
| 04/18/1991 | DE3937279C1 Multistage hydrocyclone for mfg. cellulose suspensions - has several parallel hydrocyclone cleaners which operate with specified consistency of suspension |
| 04/17/1991 | EP0422314A1 A method and device for the production of cellulose pulp of improved quality |
| 04/11/1991 | WO1991005912A1 A method and device for the production of cellulose pulp of improved quality |
| 03/20/1991 | EP0417408A1 Process for making a screen drum and screen drum made according to the process |
| 03/19/1991 | US5000842 Method and apparatus for treating fiber suspension |
| 03/14/1991 | DE3930575A1 Sorting device with vertical rotor axis - has wheel with conveyor elements rotatable near screen plate |
| 03/13/1991 | WO1991008338A1 Sieve for a pressure sorting device for fibre suspensions |
| 03/13/1991 | EP0417030A1 An apparatus for removing ash from repulped wastepaper |
| 03/12/1991 | US4999085 Simplification of process |
| 02/27/1991 | EP0414119A1 Screening cylinder |
| 02/27/1991 | CN1011799B Dryer felt run |
| 02/26/1991 | US4995991 Method and apparatus for improving the operation of a disc filter |
| 02/14/1991 | DE4024561A1 Processing waste paper |
| 02/13/1991 | CN1049114A Taper deslagging unit and manufacturing method |
| 02/12/1991 | US4991720 Apparatus for dividing a suspension of fibrous cellulose pulp |
| 02/12/1991 | CA1280076C Method and apparatus for thickening a suspension |
| 02/11/1991 | CA2022778A1 Method for processing waste paper |
| 02/04/1991 | WO1991001810A1 An apparatus in hydrocyclones for separating sand and the like coarse particles |
| 02/04/1991 | CA2064104A1 Apparatus in hydrocyclones for separating sand and the like coarse particles |
| 01/31/1991 | DE3925098A1 Grinder - has wear parts on two rotating sections which are replaceable to extend component life |
| 01/30/1991 | EP0410102A2 Straining apparatus |
| 01/30/1991 | EP0318495B1 Apparatus for treatment of fibre suspensions |
| 01/23/1991 | EP0408875A1 Straining cylinder for screening a watery suspension |
| 01/23/1991 | EP0408862A2 Hydrocyclone |
| 01/22/1991 | US4986900 Sectional screen cylinder |
| 01/22/1991 | CA1279294C Fibrous suspension pressurized sorter |
| 01/20/1991 | CA2021478A1 Hydrocyclone |
| 01/16/1991 | CN2069430U Special-shaped screen board |
| 01/10/1991 | WO1991000387A1 Method of purifying pulp of contaminations heavier than it and a separating apparatus |
| 01/09/1991 | CN1011146B High consistency pressure screen and method of separating accepts and rejects |
| 01/08/1991 | CA1278777C Screening apparatus |
| 01/07/1991 | WO1991000768A1 Method and apparatus for treating fiber suspension |
| 01/02/1991 | CA1278449C Method and apparatus for making paper |
| 01/01/1991 | US4981583 High consistency pressure screen and method of separating accepts and rejects |
| 01/01/1991 | US4981413 Pump for and method of separating gas from a fluid to be pumped |