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| Number | Title | Issue Date |
| 8177937 | Method and an apparatus for controlling a flow of pulp suspension Apparatus and methods for controlling the flow of a pulp suspension from a container in which the pulp is processed or stored are disclosed. The container is pressurized to a first pressure and includes an outlet for the pulp suspension, a pump includes an inlet and... | 05/15/2012 |
| 7390669 | Simultaneous and rapid determination of multiple component concentrations in a Kraft liquor process stream The present invention is a rapid method of determining the concentration of the major components in a chemical stream. The present invention is also a simple, low cost, device of determining the in-situ concentration of the major components in a chemical stream. In ... | 06/24/2008 |
| 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 |
| 7211194 | Gravity pressure vessel and related apparatus and methods A gravity pressure vessel (GPV) for processing a fluid stream containing organic materials provides several improvements to the art. In one embodiment, a GPV of the present invention sustains the heat energy requirements of a hydrolysis GPV by including therein, a f... | 05/01/2007 |
| 7101461 | Method and apparatus for imaging a paper web A system and process for measuring paper formation characteristics in real time is disclosed. The system comprises apparatus used in a papermaking process, and includes a rotating forming fabric having an upper and lower surface. A paper slurry is deposited upon the... | 09/05/2006 |
| 6973788 | Steam engine A stem engine has a fluid container, a heating device and a cooling device. The fluid container has an outer pipe having an upper closed end, and an inner pipe provided in the outer pipe and having a fluid inlet port through which the inside of the inner pipe is ope... | 12/13/2005 |
| 6955309 | Method of diagnosing and controlling a grinding mill for paper and the like This invention relates to a method of diagnosing or controlling a grinding mill for paper pulp, wood chips, or other fibrous materials, by measuring the incremental change in power related to an incremental change in the gap, and using the ratio of the two differenc... | 10/18/2005 |
| 6946056 | Method for regulating the manufacturing of pulp by optically measuring the amount of hexenuronic acid Method for enabling the paper pulp production process to be controlled in such a way that the hexenuronic acid content in the pulp can be minimized and the color reversion of the pulp and/or the pulp products thereby minimized. The method is based on measurements of... | 09/20/2005 |
| 6843885 | Method for controlling the cooking temperature in a continuous vapour phase digester The method is for controlling the cooking temperature in a continuous vapour phase digester for chip-shaped cellulose material. A high pressure is established in the vapour phase largely by means of steam, without risk of attaining excessively high temperatures in t... | 01/18/2005 |
| 6524437 | Process for peroxide bleaching wherein the concentrations of Mn and Fe are monitored and maintained A process for peroxide bleaching of pulp using magnesium oxide or magnesium hydroxide as a substitute for caustic soda wherein the pulp is bleached in the presence of hydrogen peroxide characterized in that the concentration of ion present in the magnesiu... | 02/25/2003 |
| 6447639 | Process for controlling a digester using real time measurement of moisture content and species of wood An on-line pulp digester control system. More particularly, this invention pertains to a control system which employs real time measurements from ion mobility spectrometry to automatically rapidly and continuously determine the physical and chemical chara... | 09/10/2002 |
| 6409882 | Tall oil refining improvement In a tall oil refining operating plant, a warm water loop is disclosed for cooling the tall oil heads fraction extracted from the crude tall oil, rather than the conventional use of cold water. This avoids condensation and the subsequent solidification of... | 06/25/2002 |
| 6398914 | Method and device for process control in cellulose and paper manufacture In the production of de-inked pulp, measuring devices are used to register spectral and/or physical characteristic values of a starting material. These values are then fed to a neural network, by means of which correction variables are obtained for a regu... | 06/04/2002 |
| 6346167 | Dissolved solids control in pulp production Kraft pulp of increased strength and bleachability may be produced with decreased consumption of effective alkali, and at a lower H factor, by keeping the dissolved organic material (DOM) concentration low substantially through the entire kraft cook, incl... | 02/12/2002 |
| 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 |
| 6238517 | Method for controlling oxygen delignification of pulp Methods of controlling oxygen delignification processes are disclosed including providing chemicals for a first oxygen delignification step, conducting the first oxygen delignification step with the chemicals, conducting a second oxygen delignification st... | 05/29/2001 |
| 6159337 | Dissolved organic materials control in cellulose pulp production Kraft pulp of increased strength and bleachability may be produced with decreased consumption of effective alkali, and at a lower H factor, by keeping the dissolved organic material (DOM) concentration low substantially through the entire kraft cook, incl... | 12/12/2000 |
| 6080274 | Method for controlling a multi-phase screening apparatus A method and apparatus for controlling a multi-step screening apparatus (1) controls other accept, reject and dilution flows in relation to the flow measured in the accept channel (7a) of the first screening step (3a). Thus a simpler control unit (9) can ... | 06/27/2000 |
| 5858170 | Method for pressurized peroxide bleaching The present invention relates to a method for safely carrying out pressurized peroxide bleaching of pulp, at a consistency exceeding 8%, preferably 10-16%, in a bleaching vessel (1), designed for at least 0.5 MPa overpressure, preferably 0.7 MPa overpress... | 01/12/1999 |
| 5766413 | Process for isothermal cooking pulp in a continuous digester 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... | 06/16/1998 |
| 5755928 | Method for automated monitoring of pulp retention time using an iodide salt as a tracer An automated system and method for measuring the residence time of wood pulp as it moves through various stages of processing in a pulp mill. A tracer compound comprising a neutral salt of a halogen is introduced into a first location in the path of the p... | 05/26/1998 |
| 5643410 | Batch process for preparing kraft pulp in a batch digesting process Methods for discharging spent cooking liquors from a batch digester containing cooked lignocellulose-containing material in spent cooking liquor are disclosed, including supplying a first portion of washing liquid to the digester to displace a first porti... | 07/01/1997 |
| 5632859 | Intergral pulp mill and method of constructing an integral mill A mill for the processing and production of wood pulp is contained substantially entirely within a single, integral structure that defines a unitarily-covered space substantially bounding and enclosing the mill. The mill includes a main control room or st... | 05/27/1997 |
| 5626766 | Process for controlling solids-liquid separation A process and apparatus for controlling and/or regulating a solids-liquid separation process, such as in a dewatering or drying device includes at least two photodetectors, each associated with a light source, a detector to detect light of the associated ... | 05/06/1997 |
| 5597446 | Method of controlling a position of rotor in a high pressure feeder In an apparatus and method for controlling the position of a rotor in a truncated conical feeder for feeding a feed comprising a lignocellulose material and an alkaline cooking liquor to a pulping digester; the position of the rotor in the feeder is detec... | 01/28/1997 |
| 5582684 | Method of determining degree of reduction in a sulfate liquor using IR and UV spectroscopy The invention relates to a method of determining the concentration of sulfide and optionally also of polysulfide in liquors and solutions of smelt deriving from the sulfate process. According to the method, the concentrations are determined by measuring t... | 12/10/1996 |
| 5567274 | Method of controlling pressurized ozone to a pulp delignification reactor A method and apparatus supply ozone containing gas under superatmospheric pressure to an ozone delignification device. The speed of a water ring compressor is controlled so that it compresses as much ozone gas per unit time at desired superatmospheric pre... | 10/22/1996 |
| 5393378 | Method for measuring and controlling fiber variations in paper sheet A formation control method and apparatus in which an image is emitted from a light source and transmitted through a predetermined area of paper an captured by a camera to be displayed as transmitted light image on a display of an image processing computin... | 02/28/1995 |
| 5367894 | Apparatus and method for washing cellulosic pulp A flat bed, Fourdrinier-type, countercurrent washer for cellulosic pulp incorporates a pressing section at the downstream end thereof which includes the couch roll and additional rolls that carry out multiple mechanical pressing operations on the pulp aft... | 11/29/1994 |
| 5306391 | Control of chemical dosage to a pulp slurry A method is disclosed for controlling a desired chemical dosage to a stream of cellulosic pulp heated by the addition of steam wherein the pulp flow rate is determined indirectly by measuring the pulp temperature after steam addition and calculating the p... | 04/26/1994 |
| 5282931 | Determination and control of effective alkali in kraft liquors by IR spectroscopy A direct monitoring and control method is provided for on-line measurement of effective alkali, carbonate, sulfate and thiosulfate concentrations in process liquors for the production of kraft pulp. The control method eliminates frequent sampling, and the... | 02/01/1994 |
| 5277759 | Method of controlling sulfidity of a sulfate cellulose mill To decrease the sulfur emissions of a sulfate cellulose mill, black liquor is heated before the last effect of the evaporation at a temperature higher than the cooking temperature of the sulfate cook and the sulfidity of white liquor is adjusted by adjust... | 01/11/1994 |
| 5160581 | Method for oxygen bleaching paper pulp A fluid is continously processed by being fed to the top of a hydraulic downdraft tube (15) which forms a downdraft column which is of a height such that the pressure at the bottom thereof will approximately be at the pressure necessary to dissolve suffic... | 11/03/1992 |
| 5122229 | Apparatus and method for washing cellulosic pulp In a flat bed, Fourdrinier-type, countercurrent washer for pulp, the opportunities for the development of foam are minimized by "wet" operation of the washer so that the pulp mat remains essentially full of liquid as it passes from each washing zone to th... | 06/16/1992 |
| 5066362 | Extended delignification in pressure diffusers Extended delignification of kraft pulp in a pressure diffuser allows a pulp mill with a digester (e.g. continuous digester) to increase its production capacity without building a new line, or to decrease its demand in its bleach plant, or to increase the ... | 11/19/1991 |
| 5032223 | Procedure for determining and controlling the composition proportions of wood chip mixes in alkaline pulp digestion processes A procedure for determining the composition of a wood chip mix dispensed in alkaline delignifying processes, particularly in sulphate and soda/anthraquinone cooking, with the aid of the monomeric compounds produced in connection with the cooking and disso... | 07/16/1991 |
| 4994145 | Process for producing a constant distribution of a selected property across the width of pulp mat on a pulp washing surface In a pulp washing system where there is substantially constant average weight of pulp mat (on a dry pulp basis), washing uniformity is improved by controlling the weight per unit area of liquid alone or liquid and pulp combined in the pulp mat across its ... | 02/19/1991 |
| 4944841 | Procedure for controlling alkaline pulping processes A procedure for monitoring alkaline delignification, in particular kraft cooking, of wood or other cellulosic material with the aid of the mutually relative concentrations of the monomeric lignin hydration products which are formed in connection therewith... | 07/31/1990 |
| 4943347 | Method of refining fibrous material by controlling the feed rate of material or the gap distance between discs A method of refining fibrous material under predetermined conditions by the help of relatively rotating refining means. The material is during refining passed from the inner circumference of the refining means to their outer circumference and is thereby e... | 07/24/1990 |
| 4889593 | Method of determining rapidly the concentration of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors A method of rapid determination of the concentrations of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors. The lignosulphonates are separated from compounds which form the total sulphur dioxide by means of an i... | 12/26/1989 |
