| Patents for D21D 5 - Purification of the pulp suspension by mechanical means; Apparatus therefor (4,157) |
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| 12/27/1990 | EP0404647A1 Apparatus of liquid degassing |
| 12/27/1990 | EP0404624A2 Method for controlling pressurized screening device and pressurized screening device |
| 12/27/1990 | CA1278208C Treatment of high yield pulp |
| 12/13/1990 | WO1990015183A1 Method of and apparatus for separating heavy impurities from fiber suspensions in connection with pumping |
| 12/12/1990 | EP0402238A2 Pulper |
| 12/12/1990 | EP0402237A2 Pressurized screening device |
| 12/11/1990 | US4976822 Apparatus for cleaning fibers |
| 12/05/1990 | EP0400787A2 Adjustable valve for rotary filters |
| 12/05/1990 | EP0400020A1 Screen plate |
| 11/29/1990 | WO1990014462A1 Method and apparatus for cleaning fibers |
| 11/27/1990 | US4972960 Disk screen with compressible spacers and flanged surrounds |
| 11/22/1990 | EP0398685A1 A method and an apparatus for treating fiber suspension |
| 11/20/1990 | US4971694 Double diffuser with backflush pistons |
| 11/17/1990 | CA2016966A1 Method and an apparatus for treating fiber suspension |
| 11/14/1990 | EP0397308A2 Method of bleaching cellulose pulp with ozone |
| 11/11/1990 | WO1990013344A1 Method of and apparatus for treating pulp |
| 11/11/1990 | CA2054727A1 Method of and apparatus for treating pulp |
| 11/06/1990 | US4968417 Apparatus for screening a suspension of fibrous cellulose pulp |
| 11/06/1990 | CA1275973C Rotating element for a screening apparatus with a contour surface |
| 10/31/1990 | EP0395236A1 Pump for separating gas from a fluid to be pumped |
| 10/11/1990 | DE3911234A1 Screen |
| 10/09/1990 | US4961844 Apparatus for separating a suspension of fibrous cellulose pulp |
| 10/06/1990 | WO1990011836A1 Device for separating fibres and gas |
| 10/06/1990 | CA2048660A1 Device for separating fibres and gas |
| 10/05/1990 | WO1990012147A1 Sectional screen cylinder |
| 10/04/1990 | DE4006633A1 Fibre suspension sieve - has projecting blades at mantle with downwards angled ends to give two fractions without clogging |
| 10/03/1990 | EP0390403A2 Method and means for treating pulp |
| 09/25/1990 | CA1274486A1 Disk screen disk spacer and shaft assemblies and a method of making same |
| 09/16/1990 | CA2011996A1 Device for the fractionation of pulp |
| 09/11/1990 | US4956090 Hydrocyclone divided into sections |
| 09/11/1990 | US4955549 Apparatus for treatment of fibre suspensions |
| 09/04/1990 | US4954249 Wave screen plate |
| 09/03/1990 | WO1990010110A1 Method and apparatus for thickening fiber suspension |
| 09/03/1990 | CA2047749A1 Method and apparatus for thickening fiber suspension |
| 08/28/1990 | CA1273196A1 Dryer felt run |
| 08/23/1990 | WO1990009242A1 Method and apparatus for cleaning of a pulp suspension |
| 08/23/1990 | DE3904960A1 Geraet zum sortieren und entstippen von fasersuspensionen For sorting Geraet and deflaking fiber suspensions |
| 08/22/1990 | EP0383219A2 A method of screening pulp and a screening apparatus |
| 08/21/1990 | US4950403 Screen segment for filters for thickening fiber suspensions |
| 08/21/1990 | US4950402 Rotating element for a screening apparatus with a contour surface |
| 08/19/1990 | WO1990009480A1 Appliance for sorting and deflaking fibre suspensions |
| 08/19/1990 | CA2027564A1 Appliance for sorting and deflaking fibre suspensions |
| 08/16/1990 | CA2010041A1 Method of screening pulp and a screening apparatus |
| 08/08/1990 | EP0381660A1 Process and installation for the treatment of material-gas mixtures to be pumped, and apparatus specially suited therefore |
| 07/31/1990 | CA2008916A1 Process for the treatment of material-gas mixtures |
| 07/25/1990 | EP0280094B1 Filter segment for a filter for thickening a fibrous suspension |
| 07/18/1990 | CN2059441U Polarization strainer |
| 07/17/1990 | US4941970 Apparatus for dividing a suspension of fibrous cellulose pulp |
| 07/11/1990 | EP0377427A2 Double diffuser with backflush pistons |
| 07/03/1990 | US4938843 Screening |
| 07/03/1990 | CA1271073A1 Screening device with device for reduction of reject |
| 06/27/1990 | EP0215781B1 A deaeration tank and installation using the tank |
| 06/26/1990 | US4936744 Centrifugal pump |
| 06/26/1990 | CA1270696A1 Combined fluidizing and vacuum pump |
| 06/14/1990 | WO1990006396A1 Method of and device for fractionating suspensions |
| 05/31/1990 | WO1990005807A1 Screening device |
| 05/23/1990 | EP0369073A1 Paper-making material deposition apparatus |
| 05/22/1990 | US4927529 Method and apparatus for separating knots |
| 05/22/1990 | CA1269348A1 Reverse hydrocyclone cleaner for removing light contaminants from pulp slurry |
| 05/22/1990 | CA1269270A1 Method for treating stock for paper making |
| 05/08/1990 | US4922989 Treatment of mechanical pulp to remove resin |
| 05/08/1990 | CA1268734A1 Sorter for paper pulp suspensions |
| 05/03/1990 | WO1990004675A1 Screen and method of manufacture |
| 05/01/1990 | CA1268427A1 Filter for continuous filtering of a suspension under pressure |
| 04/24/1990 | US4919797 Screening apparatus for paper making stock |
| 04/24/1990 | US4919796 Method and apparatus for grading fiber suspension |
| 04/24/1990 | US4918807 Screen and method of manufacture |
| 04/24/1990 | CA1268141A1 High consistency pressure screen and method of separating accepts and rejects |
| 04/18/1990 | CN1007588B Fluid impurity dissociator |
| 04/12/1990 | DE3832986A1 Papierstoffreiniger Paper Plastic Cleaner |
| 04/12/1990 | DE3831845A1 Sortiereinrichtung fuer fasersuspensionen Sorter for fiber suspensions |
| 04/10/1990 | US4915822 Method and apparatus for treating fiber suspension |
| 04/10/1990 | US4915821 Apparatus for treatment of old printed papers with short and long fiber separation |
| 04/05/1990 | WO1990003223A1 Stuff cleaner |
| 04/03/1990 | US4913806 Apparatus for screening a suspension of fibrous cellulose pulp |
| 04/03/1990 | US4913359 Paper material refining apparatus |
| 03/27/1990 | US4911828 Rejects sorting apparatus |
| 03/22/1990 | WO1990002839A1 Device for the selective separation of particles in a liquid, particularly for the purification of paper fibre suspensions |
| 03/21/1990 | EP0359682A1 Device for selectively separating particles in a fluid, in particular for purifying fibrous paper-making suspensions |
| 03/20/1990 | US4908896 Backflushing pressure diffuser screens |
| 03/20/1990 | CA1266889A1 Electronic beam welding method for screen cylinder |
| 03/07/1990 | EP0357382A2 Screen cylinder and method of manufacture |
| 03/07/1990 | CN1040239A Wave screen plate & manufacturing methods |
| 02/28/1990 | EP0356415A2 Backflushing pressure diffuser screens |
| 02/28/1990 | EP0355530A1 A method and a device for screening and treating pulp |
| 02/27/1990 | US4904395 Method and apparatus for thickening fiber suspension |
| 02/27/1990 | CA1266152A1 Process for producing high yield bleached cellulose pulp |
| 02/20/1990 | US4901417 Method of finishing screen plates |
| 02/14/1990 | EP0354846A1 Screen for the purification and classification of a pulp suspension |
| 02/13/1990 | CA1265753A1 Sieves for scrubbers and in their method of manufacture |
| 02/06/1990 | US4898665 Screens for paper pulp purifiers |
| 01/30/1990 | US4897159 Apparatus for pulp contaminant removal |
| 01/25/1990 | WO1990000646A1 A method and arrangement for cleansing a fibre suspension from light contaminants |
| 01/25/1990 | WO1990000645A1 Method and apparatus for the removal of light material from a fiber suspension |
| 01/24/1990 | EP0107718B1 Method and apparatus for spray fractionation of particles in liquid suspension |
| 01/16/1990 | US4894147 Device for screening pulp and a blade for the screening device |
| 01/09/1990 | US4892619 Changing from hardwoods to softwoods |
| 01/09/1990 | CA1264305A1 Hydrocyclone separator apparatus |
| 01/09/1990 | CA1264304A1 Method for screening or fractionation |
| 12/14/1989 | WO1989012137A1 Wave screen plate and manufacturing methods |