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| Number | Title | Issue Date |
| 8157964 | Installation for implementing a method for producing paper pulp, lignins and sugars and production method using such an installation The invention proposes an installation (10) in which the impregnation and fractionation of the raw material (MP) are conducted at atmospheric pressure, characterized in that it comprises means (18, 20) for transferring the raw material (MP) successivel... | 04/17/2012 |
| 8088253 | Digester screen for a continuous cellulose pulp digester The digester screen is for a continuous digester in which cooked cellulose pulp is produced. The digester screen has a number of screen bars arranged vertically in the continuous digester that have withdrawal slots (S) between the fixed screen bars through which wit... | 01/03/2012 |
| 7867363 | Continuous digester system In a continuous digester system the digester system is greatly simplified by using a single vertical atmospheric vessel, replacing the conventional chip bin, steaming vessel, chip chute, high pressure pumping or sluice feeders, impregnation vessels and top separator... | 01/11/2011 |
| 7837834 | Method and device for the continuous cooking of pulp The continuous digester system has an inlet defined therein for the feed of a chips suspension and an outlet for the output of a cooked suspension of pulp. The suspension of chips is fed in to the inlet through a line at the beginning of the cook, where the chips su... | 11/23/2010 |
| 7713383 | Arrangement for feeding a slurry of chips and liquid The method and arrangement is for the feed of a chips suspension from one vessel to a subsequent digester in a continuous cooking process for the production of chemical cellulose pulp. The vessel has an inlet defined therein for the input of chips and an outlet defi... | 05/11/2010 |
| 7381302 | Method and arrangement for impregnating chips The method and an arrangement are for improved impregnation of chips in association with the manufacture of chemical cellulose pulp. Un-steamed chips are fed into an impregnation vessel (30) in which a fluid level (LIQ_LEV) is established under the highest le... | 06/03/2008 |
| 7314538 | Process and device for discharging lignocellulose raw materials from a digester and conveying the raw material to a refiner A process for refining lignocellulose raw materials, especially wood chips, saw dust, annual plants or wood waste, includes dewatering the lignocellulose raw materials discharged from a digester, extracting condensate produced during dewatering, and refining the dew... | 01/01/2008 |
| 7309401 | Top separator for gas phase and hydraulic phase continuous digesters and method for converting digester A continuous digester for producing chemical cellulose pulp from cellulose chips including: a digester vessel with an upper section attached to a top separator and said vessel at least partially filled with the cellulose chips and a liquor; a top separator at least ... | 12/18/2007 |
| 7285179 | Continuous digester for cellulose pulp including method and recirculation system for such digester The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd, 3rd, 4th and 5th down through the digester, that have a successively dec... | 10/23/2007 |
| 7279070 | Method for the continuous cooking of wood raw material for cellulose pulp The invention concerns a simplified method for the continuous cooking of wood raw material in the form of sawdust for the production of cellulose pulp, The method does not require any thickening stages and can be carried out with a minimum of process equipment. The ... | 10/09/2007 |
| 7241363 | Methods to decrease scaling in digester systems One aspect of this invention relates to a method and digester for reducing the deposition of calcium-based scale in a wood chip digester including extraction from the digester of first and second quantities of cooking liquor having respective first and second calciu... | 07/10/2007 |
| 7229526 | Method and apparatus for the feeding of fibers A system for feeding fibres from a fibre separation step at a first pressure to a drying step at a second, lower pressure, the system comprising a sluice feeder (3) provided between the fibre separation step and the drying step. At least an outlet (14)... | 06/12/2007 |
| 7229524 | Feeding arrangement for feeding of chips to chip bins The invention relates to a feed arrangement for feeding chips to chip bins (1) in the production of cellulose pulp in continuous digesters (16), in which the chip bin is constituted by a treatment vessel having a top and a bottom, in which the chips ar... | 06/12/2007 |
| 7226778 | Apparatus for natural recycling of protein waste An apparatus and process for naturally recycling poultry carcasses for use as a nutritional supplement, the apparatus generally consists of four modules: an enzymatic digest medium mixing assembly that self adjusts for pH; a mobile grinding assembly mounted on a tru... | 06/05/2007 |
| 7217317 | Device and method for the secure conveyance and handling of spinnable cellulose solutions Device and procedure for safely conveying and handling a cellulose solution suitable for manufacturing solvent-spun cellulose molded parts, in particular for manufacturing fibers, films and membranes, in devices for conveying and handling the spinnable cellulose sol... | 05/15/2007 |
| 7156952 | Method and arrangement for oxygen delignification of cellulose pulp The invention relates to a method and arrangement for alkaline oxygen delignification of cellulose pulp. By adding alkali in the final phase of the oxygen delignification one can ensure that an optimal predetermined end-pH is obtained. This provides advantages in th... | 01/02/2007 |
| 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 |
| 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 |
| 7087264 | Ultrasonic transducer, method for manufacturing ultrasonic transducer, and ultrasonic flowmeter It is an object of the present invention to provide an ultrasonic transducer, which is so configured as to reduce the variations in characteristics, thereby to enable the stabilization of the precision, as well as to enable the improvement of the durability, and the... | 08/08/2006 |
| 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 |
| 7060162 | Chip bin A chip bin for a digester has an upper part through which chips fall freely from an inlet and a lower part within which the chips remain until they are fed to a digester. Steam orifices strike falling chips with steam and disperses the chips over the interior of the... | 06/13/2006 |
| 6966970 | Method for supplying washing liquid to a process for cooking cellulose pulp The invention relates to a method for supplying washing liquid to a digester (1) for cellulose pulp and a subsequent diffuser washing device (2a, 2b). A high, disturbance-free production capacity can be obtained by using a common feed pump (P... | 11/22/2005 |
| 6958110 | Apparatus for the production of cellulose paper pulps by biodelignification of vegetative masses Apparatus for the production of cellulose paper pulps from vegetative masses, comprising: a tower for sterilizing the mass to form a culture medium; a first screw for mixing the sterilized mass with an inoculum and handling the same in a sterile environment; a first... | 10/25/2005 |
| 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 |
| 6841042 | Feeding comminuted fibrous material using high pressure screw and centrifugal pumps A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfer device co... | 01/11/2005 |
| 6808596 | System for the oxygen delignification of pulp consisting of lignocellulose-containing material The system is for the oxygen delignification, in at least two reaction stages, of pulp that consists of lignocellulose-containing material having a mean concentration of 8%-18% pulp consistency. The oxygen delignification takes place in a first reaction stage that h... | 10/26/2004 |
| 6582554 | Continuous digester having a sectioned top separator with multiple liquor extraction ports A method is disclosed for extracting liquor from a cellulose slurry for a continuous digester comprising the steps of: providing the cellulose slurry of liquor and chips of cellulose fiber material to a separator; extracting a first stream of liquor from ... | 06/24/2003 |
| 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 |
| 6447645 | Feeding cellulose material to a treatment vessel A feed system for a cellulose pulp treating vessel (such as a continuous digester) is not limited by the required L/W ratio of the pump feeding a wood chip slurry to a high pressure transfer device, the feed system may be kept at a low temperature to mini... | 09/10/2002 |
| 6379504 | Apparatus for pulping sawdust Chemical cellulose pulp is made from sawdust utilizing a static down-flow retention vessel. By adding steam and cooking liquor to a flow of sawdust a heated slurry, at a cooking temperature of about 250-350° F., is produced. The heated slurry is, at supe... | 04/30/2002 |
| 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 |
| 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 |
| 6248208 | Pretreatment of chips before cooking The strength properties of chemical cellulose pulp (particularly kraft pulp) are improved by substituting a cold impregnation soak for conventional impregnation procedures. After steaming, wood chips are soaked in an alkaline liquid at a temperature of ab... | 06/19/2001 |
| 6174411 | Continuous digester with inverted top separator A cellulose pulp continuous digester (e.g. for producing kraft pulp) is operated so that it has an inverted top separator and is hydraulically filled to above the level of the inverted top separator, and may be substantially completely hydraulically full.... | 01/16/2001 |
| 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 |
| 6120646 | Feeding system of feeding a cellulose material A feeding system for feeding comminuted cellulose containing material and liquid to a continuously operating treatment vessel. The feeding system comprises a chute, operating at a first pressure, a high pressure feeder sluices the material to a second pre... | 09/19/2000 |
| 6109312 | Air evacuation insert for wood chip digester An insert is bolted to the inlet of a wood chip digester to provide air exhaust during chip loading, and over pressure relief during chip processing. The insert has an upper flange which connects to an overhead chip valve, and a lower flange which mates w... | 08/29/2000 |
| 6071375 | Gas purge protection of sensors and windows in a gas phase processing reactor A gas purged viewport for endpoint detection in a gas phase processing chamber is provided which prevents contamination of an optical monitoring window by use of a purge gas flow. The purge gas purges the viewport and prevents deposition of byproducts and... | 06/06/2000 |
| 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 |
