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| Number | Title | Issue Date |
| 7964065 | Screen structure for use in the manufacture of a fiber product The present invention relates to a method and apparatus for feeding chemical into a liquid flow. The method and apparatus according to the invention are especially suitable for applications where very small volumes of chemical must be fed in precise amounts in large... | 06/21/2011 |
| 7736467 | Screen assembly for a pulp digester A pulp digester includes a vessel having an inlet, an outlet and a wall extending between the inlet and the outlet, the wall of the vessel having a curved interior surface. The digester includes a screen assembly positioned inside the vessel adjacent to the curved i... | 06/15/2010 |
| 7186390 | Brine maker An improved brine maker includes a hopper having open upper and lower ends, a solids screen, and a receiving tank having an open upper end and closed lower end. The solids screen and receiving tank are pivotally secured to the hopper adjacent its lower end. The rece... | 03/06/2007 |
| 7147750 | Extraction with compaction and springback considerations A vessel is constructed with (preferably substantially stationary) screen surfaces which minimize compaction of comminuted cellulosic fibrous material, and allow springback of the material, as it flows downwardly. A slurry of wood chips, sawdust, or pulp is passed d... | 12/12/2006 |
| 7125472 | Slotted screen for digester A screen panel for a wood-chip digester, comprises a screen plate having a plurality of slots therein that are curved in the form of an arc. Each slot has a generally parallel-sided middle portion in the middle of the thickness of the screen plate, which middle port... | 10/24/2006 |
| 7115189 | Slotted screen for digester A screen panel for a wood-chip digester comprises a screen plate having a plurality of slots therein that are curved in the form of an arc. Each slot has a width in the range of from 3 mm to 10 mm. One form of slot has a generally parallel-sided middle portion in th... | 10/03/2006 |
| 7105076 | Gas phase continuous digester having an inverted top separator with liquor injection A continuous digester is disclosed for producing chemical cellulose pulp from cellulose chips, comprising: a continuous digester vessel having a lower section filled with the cellulose chips and an upper gas filled section; an inverted separator at least partially i... | 09/12/2006 |
| 7097740 | Method and screen for screening at least two pulp mixtures The invention relates to a method and a screen for screening two or more pulp mixtures with different roughness. The screen comprises a first screen cylinder and a second screen cylinder. A coarse first pulp mixture is fed into the inlet end of the first screen cyli... | 08/29/2006 |
| RE39208 | Method of treating material in a continuous digester A comminuted cellulosic fibrous material treatment vessel assembly includes a substantially vertical vessel having a top, bottom, and outlet, and through which the material flows in a flow direction. The vessel preferably has a substantially cylindrical wall with at... | 08/01/2006 |
| 6905032 | Screens for fibrous paper suspensions and process for making same Process for manufacturing screens and screens suitable for use in wet screening fibrous paper suspensions, in which the screens include at least one screen plate having a number of sorting apertures. The process includes providing a number of fastening openings in t... | 06/14/2005 |
| 6883669 | Multi-element airfoil for pulp screens A the operation of pulp screening apparatus may be improved by employing a multi element foil having a leading foil section and a trailing foil section spaced from and trailing leading section so that adjacent surfaces of the sections one formed by a portion of a pr... | 04/26/2005 |
| 6649068 | Filtration of pulp mill liquids A fiber mat is formed on a screen cylinder of a pressurized fiber filtering device used to filter particles from a liquid stream. The fiber mat is a fine particle filter to remove small particles from the liquid stream. The fiber mat is formed by injectin... | 11/18/2003 |
| 6569289 | Cellulose slurry treating systems for adding AQ to a cellulose slurry in the substantial absence of alkali Chemical pulp is produced from a slurry of comminuted cellulosic fibrous material using a beneficial additive such as AQ, or polysulfide. In the first treatment zone the effective alkali concentration and temperature conditions are such so that substantia... | 05/27/2003 |
| 6553593 | Plate diffuser for treating comminuted cellulosic fibrous material The problems of non-uniform treatment of paper pulp that may be caused by differential flow velocities within a vessel, channeling, and/or disruption of the pulp flow, are substantially eliminated by providing a non-circular cross-section substantially at... | 04/29/2003 |
| 6451172 | In-line drainer enhancements A drainer for a feed system for a cellulose digester has a substantially open and hollow inlet (devoid of a spiral flow imparter or a like flow restriction) and a substantially annular screen within an elongated housing having a flow direction between the... | 09/17/2002 |
| 6375796 | Method of treating material in a continuous digester A comminuted cellulosic fibrous material treatment vessel assembly includes a substantially vertical vessel having a top, bottom, and outlet, and through which the material flows in a flow direction. The vessel preferably has a substantially cylindrical w... | 04/23/2002 |
| 6348130 | Variable pressure screening Pressure type screening apparatus for screening papermakers' stock and method of use is disclosed. Screen (20) has an inlet screening surface (23) and an outlet surface (unlabled). Pressure transducers (not shown) vary the fluid pressure on the inlet surf... | 02/19/2002 |
| 6344112 | Screen having inclined slots for a digester A screen used in the production of cellulose pulp may be mounted in a digester to minimize traditional screen problems (including clogging) without introducing new problems. The screen comprises a screen plate having a plurality of slots formed in it with... | 02/05/2002 |
| 6325889 | Hydraulic vessel system having a downwardly feeding separator A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-e... | 12/04/2001 |
| 6311850 | Pressure screening apparatus for screening a paper stock suspension and screen clearer for such a screening apparatus A pressure screening apparatus for screening a stock suspension and screen clearer for a pressure screening apparatus. The pressure screening apparatus includes an inflow chamber, a suspension inflow connected to one end of the inflow chamber, a reject ou... | 11/06/2001 |
| 6311849 | Device for dehydrating and washing suspensions of fibrous material The invention relates to a device for dewatering and washing fibre stock suspensions with two counter-rotating rolls (2, 3), a stock feed (4, 5) and a stock discharge (6). It is mainly characterized by the headbox (4, 5) at the two rolls (2, 3) being arra... | 11/06/2001 |
| 6287416 | Sampling apparatus with removable filter for cleaning The object of the invention is a sampling apparatus in a continuous industrial process for taking a sample (16) of the substance to be monitored (11). The sampling apparatus is located on the wall (11) of the pulp tank and it includes a sample chamber (14... | 09/11/2001 |
| 6284145 | Screen plate for screening of a pulp suspension and method to separate the same A screen plate (1) for screening of pulp suspensions, comprises a number of elongated at least partially curved screen slots (3). According to the invention every screen slot has a width which is maximally 0.8 mm, and the screen slots bend in such a way t... | 09/04/2001 |
| 6272710 | Plate diffuser for treating comminuted cellulosic fibrous material The problems of non-uniform treatment of paper pulp that may be caused by differential flow velocities within a vessel, channeling, and/or disruption of the pulp flow, are substantially eliminated by providing a non-circular cross-section substantially at... | 08/14/2001 |
| 6261417 | Dehydrating concentrator A strainer with a screen at its outer periphery is rotatably supported on a casing. A hollow pipe with paddles on an outer periphery of the pipe is fitted in the strainer. The hollow pipe is rotated at a rotating velocity different from that of the strain... | 07/17/2001 |
| 6254729 | Pulper with extraction plate assembly having removable inserts and method of manufacturing same A pulper for pulping a fiber suspension includes a vessel, an extraction plate assembly and a rotor. The extraction plate assembly is disposed within the vessel and includes a metal plate with a plurality of holes extending therethrough. A plurality of me... | 07/03/2001 |
| 6214171 | Top separator in a continuous digester system A method in connection with continuous cooking of chips that comprises impregnating the chips with a impregnation liquid in an impregnation vessel and cooking the impregnated chips in a digester. The impregnation vessel and digester are connected to one a... | 04/10/2001 |
| 6171494 | Hydraulic vessel system having a downwardly feeding separator A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-e... | 01/09/2001 |
| 6165323 | Screen plate having a plurality of inclined slots in a digester A screen assembly particularly adapted to be used in a continuous or batch digester in the production of cellulose (chemical) pulp utilizes a particular screen plate construction that enhances productivity while minimizing blockage of the screen slots (an... | 12/26/2000 |
| 6149015 | Screen apparatus for papermaking material A screen apparatus is formed of a tank for receiving a papermaking material, a cylindrical first screen for partitioning the tank into a first chamber and a second chamber, an annular second screen disposed in the first chamber, and a rotating member disp... | 11/21/2000 |
| 6129816 | Tapered screen assembly for a cellulose pulp digester A comminuted cellulosic fibrous material treatment vessel assembly includes a substantially vertical vessel having a top, bottom, and outlet, and through which the material flows in a flow direction. The vessel preferably has a substantially cylindrical w... | 10/10/2000 |
| 6120647 | Simplified liquid removal system for a cellulose pulp digester A vertical pulp treatment vessel having a top and bottom, such as a continuous or batch digester, has at least a first substantially annular screen assembly disposed within the vessel between the top and bottom. A first substantially annular header is ass... | 09/19/2000 |
| 6117273 | Mechanical strainer for fibrous suspensions The invention realizes an improved mechanical strainer for fibrous suspensions including: a rotor; a filtering basket substantially coaxial externally to said rotor; an interspace defined between the side surfaces of said rotor and of said filtering baske... | 09/12/2000 |
| 6113742 | Digester having screening arrangement for isothermal cooking of fibrous material The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), where input of fibre material and cooking liquid takes place at the top of the digester, withdrawal of s... | 09/05/2000 |
| 6063238 | Black liquor impregnation in digester The present invention relates to a digester and a method for continuously cooking kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips (2) being fed in at a first end (3) of the digester (1), white liquor (4)... | 05/16/2000 |
| 6051103 | Paper-making screen apparatus A paper-making screen apparatus for separating foreign matters from paper-making raw materials is formed of a screen having a first annular end plate located at an end; a second annular end plate located at the other end thereof, having a plurality of ope... | 04/18/2000 |
| 6039841 | Screen having inclined slots for use in a continuous digester A screen used in the production of cellulose pulp mounted in a digester minimizes traditional screen problems (including clogging) without introducing new problems. The screen comprises a screen plate secured to an internal surface of the digester. The sc... | 03/21/2000 |
| 6024837 | Low temperature gas phase continuous digester A cellulose pulp continuous digester (e.g. for producing kraft pulp) is operated so that it has the advantages of a hydraulic digester yet has a gas-filled zone over the liquid level. A slurry of chips and cooking liquor is introduced into the top of the ... | 02/15/2000 |
| 5985096 | Vertical pulping digester having substantially constant diameter In a vertical digester for producing chemical pulp, or other vessel for treating a slurry of comminuted fibrous cellulosic material, the cost of manufacturing the shell is significantly reduced by eliminating the external step increases in the digester sh... | 11/16/1999 |
| 5942336 | Methods for recycling flush water and waste solids in a wood panel fabrication process A method for recycling contaminated flush water from a wet electrostatic precipitator emission control system in a wood panel fabrication process. The recycled flush water containing solid byproducts from the emission control system is combined with wood ... | 08/24/1999 |
