With Testing, Sampling Or Analyzing Patents (Class 162/49)
  • Patent number: 9057015
    Abstract: The present invention relates to an aqueous preparation comprising a fluorescent dyestuff of a specific formula, water, and optionally a dispersing agent, and the use of the aqueous preparation for dyeing cellulose- or polyamide-containing materials.
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: June 16, 2015
    Assignee: Kemira Germany GmbH
    Inventor: Helmut-Martin Meier
  • Patent number: 8914142
    Abstract: A method and a system for optimization of parameters for a recovery boiler in a pulp mill are disclosed. An exemplary method is based on use of a first principle mathematical model to estimate parameters that are otherwise not measurable, to accurately control the performance of the recovery boiler. In addition, a method is disclosed to use estimated parameters of a recovery boiler to control and stabilize the processes downstream of the recovery boiler. A system is also disclosed to carry out a method for control and optimization of performance and operational parameters of a recovery boiler.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: December 16, 2014
    Assignee: ABB Research Ltd
    Inventors: Tarun Prakash Mathur, Babji Buddhi Srinivasa
  • Publication number: 20140284007
    Abstract: The invention relates to a method or methods of operating an apparatus for treating material by cutting, soaking and/or washing of the material, wherein the apparatus comprises a receptacle, a discharge element with a vortex generator and a pump arranged to pump fluid and material from the receptacle towards the vortex generator, wherein the vortex generator and the pump in combination are adapted to generate a vortex in the form of a conic helix in the fluid extending into the receptacle.
    Type: Application
    Filed: May 15, 2014
    Publication date: September 25, 2014
    Applicant: Biogasol Aps
    Inventors: Finn Beldring, Dragan Lukic
  • Patent number: 8834675
    Abstract: Scale formation on the electrode(s) of a liquor sensor can be prevented by continuously delivering a water-soluble scale inhibitor or dispersant into the vicinity of the electrodes of a liquor sensor device. Scale inhibitors include, for instance, polymers that are derived from acrylic acid, maleic acid, acrylamide acid, phosphonate, and combinations thereof. An aqueous mixture of scaling inhibitor continuously delivered to the probe tip of the liquor sensor that was placed in a kraft pulping liquor allowed the sensor to operate accurately for over a month without having to be cleaned of scale.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: September 16, 2014
    Assignee: Honeywell ASCa Inc.
    Inventor: Sebastien Tixier
  • Publication number: 20140190643
    Abstract: The present invention relates to a method of and an arrangement for transferring a process liquid from a washing and thickening device to a subsequent process stage. In accordance with an advantageous embodiment of the present invention, the method and the arrangement are applicable, for example, in transferring fibre suspensions or pulps from washing and thickening device to a subsequent process stage in pulp and paper making industry such that the dilution of pulp after a washing and thickening device is performed in a stand pipe (18) below the surface level control range.
    Type: Application
    Filed: January 2, 2014
    Publication date: July 10, 2014
    Inventors: Reijo VESALA, Vesa Vikman
  • Patent number: 8771472
    Abstract: The invention relates to an apparatus for treating material by cutting, soaking and/or washing of the material, wherein the apparatus comprises a receptacle, a discharge element with a vortex generator and pumping means arranged to pump fluid and material from the receptacle towards the vortex generator, wherein the vortex generator and pumping means in combination are adapted to generate a vortex in the form of a conic helix in the fluid extending into the receptacle.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: July 8, 2014
    Assignee: Biogasol ApS
    Inventors: Finn Beldring, Dragan Lukic
  • Patent number: 8679293
    Abstract: A system and method for optimizing a process for refining lignocellulosic granular matter such as wood chips use a predictive model including a simulation model based on relations involving a plurality of matter properties characterizing the matter such as moisture content, density, light reflection or granular matter size, refining process operating parameters such as transfer screw speed, dilution flow, hydraulic pressure, plate gaps, or retention delays, at least one output controlled to a target such as primary motor load or pulp freeness, and at least one uncontrolled output such as specific energy consumption, energy split, long fibers, fines and shives. An adaptor is fed with measured values of matter properties and measured values of controlled and uncontrolled outputs, to adapt the simulation model accordingly. An optimizer generates a value of the target according to a predetermined condition on a predicted uncontrolled output parameter and to one or more process constraints.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: March 25, 2014
    Assignee: Centre de Recherche Industrielle du Quebec
    Inventors: Feng Ding, Ilich Lama, Richard Gagnon, Claude Lejeune
  • Patent number: 8613837
    Abstract: The invention is directed towards methods and compositions for identifying the specific microorganisms present in a particular potion of a papermaking processes. The method involves obtaining a sample from the process which is such that little or no live examples of the microorganism remain. However because DNA from the organisms is still present, an analysis which identifies portions of DNA specific to the particular organism will correctly identify the microorganism present. This allows for analysis of infestations present on felts or paper sheets which typically no longer have many live microorganisms on them when samples are taken for analysis.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: December 24, 2013
    Assignee: Nalco Company
    Inventors: Laura E. Rice, Liliya Lund
  • Patent number: 8591701
    Abstract: A method of extracting hemp fibers from decorticated hemp bast skin involves pre-treating the decorticated hemp bast skin with an aqueous solution containing di-sodium citrate, tri-sodium citrate or a mixture thereof having a pH of from about 6-13 at temperature of about 90° C. or less; and subsequently treating recovered fiber with a enzyme. Determining the extent of completion of a plant fiber degumming process involves treating degummed fiber with a recombinant pectinase expressed in an organism that produces neither cellulose nor xylanase, to release reducing sugar from any residua pectin on the degummed fiber, and, quantifying the released reducing sugar.
    Type: Grant
    Filed: May 14, 2007
    Date of Patent: November 26, 2013
    Assignee: National Research Council of Canada
    Inventors: Wing L. Sung, Mark Wood, Fang Huang
  • Publication number: 20130248127
    Abstract: A method for measuring and controlling a chip level and/or a chip-liquor combination level and/or liquor level height of a liquid-steam phase digester or a hydraulic digester which digester comprises a chip screw for feeding chips into a digesting volume. The method comprises mounting electrode pairs in certain heights and vertically at distances from each other in the digesting volume of the digester, the electrode pairs being formed of electrodes; connecting the electrode pairs to electric circuits; measuring in each electric circuit a current or voltage value during operation of the digester; determining, based on the measurement, type of material layer (for example, steam, chips, combination of chips and liquor, or liquor) located in a certain height, based on the electrical conductivity of the materials in the digesting volume.
    Type: Application
    Filed: March 28, 2012
    Publication date: September 26, 2013
    Applicant: SAVCOR FOREST OY
    Inventor: Martti Pulliainen
  • Patent number: 8540845
    Abstract: A method and system for stabilizing dry-based density of wood chips from several sources feeding a chip processing stage upstream of a chip refining process, perform on-line estimation of a set of wood chip properties characterizing the wood chips, including light reflection-related property, moisture content and dry-based density, which are used by a reference model capable of comparing the estimated dry-based density with a predetermined target to produce error data, and selectively modifying discharge rate set points of one or more of the wood chip sources to minimize the error data within fluctuation limits around the target. The discharge rate of the wood chip sources is controlled in accordance with the set points to substantially stabilize the dry-based density of the wood chips.
    Type: Grant
    Filed: April 27, 2011
    Date of Patent: September 24, 2013
    Inventors: Feng Ding, Claude Lejeune
  • Patent number: 8500957
    Abstract: A method for monitoring with enhanced sensitivity of the deposition of one or more organic materials dispersed in an aqueous medium in a papermaking process which includes measuring the rate of deposition of the organic materials from the aqueous medium onto a quartz crystal microbalance having a top side contacting with the aqueous medium coated with a layer containing a material with surface energy in the range from about 34 to about 49 dynes/cm2, and a second, bottom side isolated from the aqueous medium is disclosed. Additionally, a method for measuring the effectiveness of an inhibitor that decreases the deposition of the organic materials in a papermaking process is also disclosed.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: August 6, 2013
    Assignee: Nalco Company
    Inventors: Sergey M. Shevchenko, Michael J. Murcia
  • Patent number: 8486225
    Abstract: An inventive method includes the steps of: loading a fiber product in an appropriate form into a treatment vessel; wetting the fiber product; forcibly circulating an ozone-containing liquid in contact with the wetted fiber product to thereby bleach the fiber product; and forcibly circulating an ozone decomposing chemical agent liquid in contact with the ozone-treated fiber product to decompose ozone. This method ensures efficient bleaching of the fiber product with the ozone. Further, the method is advantageous in that the resulting bleached fiber product is less liable to be yellowed over time.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: July 16, 2013
    Inventors: Shigenori Aono, Koichi Abe, Keigo Takeda
  • Publication number: 20120255691
    Abstract: The use of measurement information from traditional process variables along with measurement signals from the refining zones in refiners for the refining and grinding of pulp is disclosed for estimating the quality of pulp output from the refiner lines. Control of the refining process is thus improved by means of a method used with a series of refiners utilizing estimated pulp quality information from each refiner in order to be able to rapidly control the refining disturbances in the process.
    Type: Application
    Filed: December 20, 2010
    Publication date: October 11, 2012
    Inventor: Anders Karlström
  • Patent number: 8262855
    Abstract: A method and an apparatus for determining the total peroxide content of a cellulose pulp suspension in the pulp suspension bleaching stage, wherein the bleaching chemical is peroxide. A sample is taken from the pulp suspension, which sample is measured in a measuring device (25, 25?). Before measuring, the pH of the sample is adjusted and after that the total peroxide content or the perhydroxyl content of the sample is measured, of which measurement the total peroxide content of the sample is determined.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: September 11, 2012
    Assignee: Metso Automation Oy
    Inventors: Teuvo Peltomāki, Aleksi Pohjola, Pasi Antero Keinänen
  • Publication number: 20120058534
    Abstract: The present invention relates to a process for pretreatment of a feedstock in a pretreatment tank. Various parameters, such as oxidation-reduction potential, pH, and temperature, are monitored in the pretreatment tank to determine whether the oxidation-reduction potential, pH, and temperature are each within a predetermined range. The volume of feedstock inside the pretreatment tank is adjusted in response to a determination that one of the oxidation-reduction potential, pH, and temperature of the treated material are outside the corresponding predetermined ranges to maintain the oxidation-reduction potential, pH, and temperature of the treated material within operating conditions.
    Type: Application
    Filed: March 9, 2011
    Publication date: March 8, 2012
    Inventors: Enos Loy Stover, Ted Ross Stover
  • Publication number: 20120037325
    Abstract: The invention relates to an apparatus for treating material by cutting, soaking and/or washing of the material, wherein the apparatus comprises a receptacle (10), a discharge element (20) with a vortex generator and pumping means (22) arranged to pump fluid and material from the receptacle (10) towards the vortex generator, wherein the vortex generator and pumping means (22) in combination are adapted to generate a vortex in the form of a conic helix in the fluid extending into the receptacle.
    Type: Application
    Filed: January 13, 2010
    Publication date: February 16, 2012
    Applicant: BIOGASOL IPR APS
    Inventors: Finn Beldring, Dragan Lukic
  • Publication number: 20110277948
    Abstract: A method of monitoring and inhibiting scale precipitation and deposition from spent liquor in pulp mill evaporators and concentrators is disclosed. The method includes connecting a black liquor deposition monitor to a pulp mill evaporator or concentrator and measuring the thermal conductivity on the outer surface of the monitor. A controller interprets the measured thermal conductivity and determines a level of scale deposition. If the level of scale deposition is above a predetermined level, the controller is operable to introduce a scale-inhibiting composition to the spent liquor. The scale-inhibiting composition may include organic polycarboxylic acids; organic fatty acids; low molecular weight and polymeric aromatic acids; organic acid esters, anhydrides, and amides; low molecular weight and polymeric aliphatic and aromatic sulfonic acids; and low molecular weight and polymeric amines; and any combinations.
    Type: Application
    Filed: July 25, 2011
    Publication date: November 17, 2011
    Inventors: Sergey M. Shevchenko, Prasad Y. Duggirata, Dmitri L. Kooznestov
  • Patent number: 8009277
    Abstract: A method for determining simultaneously from an oxidized black liquor sample an amount of sulfide, an amount of total dissolved solids, and an amount of effective alkali present in the sample, wherein the sulfide amount, the total dissolved solids amount, and the effective alkali amount are determined by subjecting the sample to attenuated total reflection (ATR) ultraviolet/visible (UV/V) spectroscopy over a wavelength of from about 190 to about 500 nm. Data from analyzing oxidized black liquor samples, and from analyzing one or more black liquor samples which may be subjected to black oxidation, may be used in a black liquor oxidation (BLOX) system for monitoring and/or controlling sulfur emissions from a kraft process.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: August 30, 2011
    Assignee: International Paper Company
    Inventors: Xin-Sheng Chai, Christopher L. Verrill
  • Patent number: 7985318
    Abstract: A method of monitoring and inhibiting scale precipitation and deposition from spent liquor in pulp mill evaporators and concentrators is disclosed. The method includes connecting a black liquor deposition monitor to a pulp mill evaporator or concentrator and measuring the thermal conductivity on the outer surface of the monitor. A controller interprets the measured thermal conductivity and determines a level of scale deposition. If the level of scale deposition is above a predetermined level, the controller is operable to introduce a scale-inhibiting composition to the spent liquor. The scale-inhibiting composition may include organic polycarboxylic acids; organic fatty acids; low molecular weight and polymeric aromatic acids; organic acid esters, anhydrides, and amides; low molecular weight and polymeric aliphatic and aromatic sulfonic acids; and low molecular weight and polymeric amines; and any combinations.
    Type: Grant
    Filed: May 10, 2007
    Date of Patent: July 26, 2011
    Assignee: Nalco Company
    Inventors: Sergey M. Shevchenko, Prasad Y. Duggirala, Dmitri L. Kouznetsov
  • Patent number: 7919067
    Abstract: A method and an apparatus for controlling a causticizing process, the process comprising slaking, causticizing and white liquor preparation. The slaking is carried out using a slaker into which green liquor and lime is fed to produce lime milk. The causticizing process is controlled by applying a model that describes at least a part of the causticizing process.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: April 5, 2011
    Assignee: Metso Automation Oy
    Inventor: Hannu Kuoksa
  • Publication number: 20110073263
    Abstract: A method for monitoring with enhanced sensitivity of the deposition of one or more organic materials dispersed in an aqueous medium in a papermaking process which includes measuring the rate of deposition of the organic materials from the aqueous medium onto a quartz crystal microbalance having a top side contacting with the aqueous medium coated with a layer containing a material with surface energy in the range from about 34 to about 49 dynes/cm2, and a second, bottom side isolated from the aqueous medium is disclosed. Additionally, a method for measuring the effectiveness of an inhibitor that decreases the deposition of the organic materials in a papermaking process is also disclosed.
    Type: Application
    Filed: October 19, 2010
    Publication date: March 31, 2011
    Inventors: Sergey M. Shevchenko, Michael J. Murcia
  • Publication number: 20100258257
    Abstract: A method of and an apparatus for controlling the height of a material column in a vessel upstream of a pump, in which method material is conveyed into an upper portion of the vessel, electrical signals are provided on the basis of the presence of material at predetermined measuring levels of the vessel by using a first sensor set disposed at a first measuring level at the upper portion of the vessel and a second sensor set disposed at a second measuring level at the lower portion of the vessel, and material is extracted at a controlled flow speed from a lower portion of the vessel by the pump, wherein the provided electrical signals are used to infer weighting factors of measuring level presence functions, and the flow speed is controlled on the basis of the weighting factors of the measuring level presence functions.
    Type: Application
    Filed: July 25, 2008
    Publication date: October 14, 2010
    Applicant: Sulzer Pumpen AG
    Inventor: Kimmo Leinonen
  • Publication number: 20100236732
    Abstract: A method of monitoring and controlling one or more types of hydrophobic contaminants in a papermaking process is disclosed. The methodology utilizes the measurement of dyes, which are capable of fluorescing and interacting with the hydrophobic contaminants.
    Type: Application
    Filed: March 17, 2009
    Publication date: September 23, 2010
    Inventors: Alessandra Gerli, Laura M. Sherman, Michael J. Murcia
  • Publication number: 20100147472
    Abstract: A method of extracting hemp fibers from decorticated hemp bast skin involves pre-treating the decorticated hemp bast skin with an aqueous solution containing di-sodium citrate, tri-sodium citrate or a mixture thereof having a pH of from about 6-13 at temperature of about 90° C. or less; and subsequently treating recovered fiber with a enzyme. Determining the extent of completion of a plant fiber degumming process involves treating degummed fiber with a recombinant pectinase expressed in an organism that produces neither cellulose nor xylanase, to release reducing sugar from any residua pectin on the degummed fiber, and, quantifying the released reducing sugar.
    Type: Application
    Filed: May 14, 2007
    Publication date: June 17, 2010
    Inventors: Wing L. Sung, Mark Wood, Fang Huang
  • Publication number: 20100132900
    Abstract: The invention refers to a method for determination brightness of paper pulp by measuring fluorescence from UV. The measurement is carried out directly in the pipe in which the paper pulp, which shall constitute the paper, is fed forward, by an in-line brightness meter, which also is capable to measure fluorescent substances in the paper pulp, a direct control of the partial stages in the paper pulp process where fluorescent substances can exist or a determination at the end of the process can be accomplished.
    Type: Application
    Filed: November 1, 2007
    Publication date: June 3, 2010
    Inventors: Niclas Andersson, Marcus True
  • Publication number: 20100116450
    Abstract: An inventive method includes the steps of: loading a fiber product in an appropriate form into a treatment vessel; wetting the fiber product; forcibly circulating an ozone-containing liquid in contact with the wetted fiber product to thereby bleach the fiber product; and forcibly circulating an ozone decomposing chemical agent liquid in contact with the ozone-treated fiber product to decompose ozone. This method ensures efficient bleaching of the fiber product with the ozone. Further, the method is advantageous in that the resulting bleached fiber product is less liable to be yellowed over time.
    Type: Application
    Filed: December 26, 2007
    Publication date: May 13, 2010
    Inventors: Shigenori Aono, Koichi Abe, Keigo Takeda
  • Patent number: 7674355
    Abstract: A method of measuring macro and micro stickies in a recycled sample containing pulp fibers is disclosed. The method includes forming a slurry of the recycled macro stickies and a liquid and using a first separation device to separate out the macro stickies and the pulp fiber while collecting the screenate. The macro stickies and the pulp fibers are then washed with additional liquid to further separate out any macro stickies while again collecting the screenate. The macro stickies are then removed from the first separation device and are measured. The method also includes agglomerating the micro stickies in the screenate to form agglomerated micro stickies. The screenate is routed through a second separation device to separate out the agglomerated micro stickies. The agglomerated micro stickies are then removed from the separation device and are measured.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: March 9, 2010
    Assignee: Doshi & Associates, Inc.
    Inventors: Mahendra R. Doshi, Robert L. de Jong, Salman Aziz
  • Publication number: 20100032111
    Abstract: A process for producing fibrous material which includes the following: preparing a solution of chemicals that includes less than 25% of sulphite (calculated as Na2SO3), based on the oven-dry amount of the lignocellulosic raw material; mixing the solution of chemicals with wood in a specified liquor material; heating the solution of chemicals and the wood to a temperature above room temperature; and then either of the following alternatives: (1) removing the free-flowing solution of chemicals and digestion of the wood in the vapor phase; (2) having the wood digested in the liquid phase and separating the free-flowing solution of chemicals and the wood.
    Type: Application
    Filed: April 4, 2007
    Publication date: February 11, 2010
    Applicant: VOITH PATENT GmbH
    Inventors: Esa-Matti Aalto, Hans-Ludwig Schubert
  • Patent number: 7658820
    Abstract: A continuous digester comprises a wash zone having a plurality of individual wash screens disposed about an inner wall of the digester for the withdrawal of co-current downflow liquor from the wash zone. A conduit is connected in fluid communication between each of the wash screens and a collector for co-current downflow liquor withdrawn from the wash zone of the digester. A valve is interposed along the length of the conduit leading from each of the wash screens. The valve is operable between open and closed positions in response to a signal received from a temperature sensor associated with the conduit leading from each of the wash screens.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: February 9, 2010
    Assignee: International Paper Company
    Inventors: Dean K Lawrence, Wayne G Hill, Stanislaus L Ludwig, David R Code
  • Publication number: 20100012284
    Abstract: A method for determining the concentration of hydrophobic organic particles in the filtrate of a paper stock, wherein the hydrophobic organic particles are marked with a fluorescent dye, said particles are then excited to emit light, the light emitted by the marked particles is detected and the concentration by mass of the particles is determined from the fluorescence intensity, and use of the method for determining the total concentration of hydrophobic organic particles in the filtrate of a paper stock drained on a wire.
    Type: Application
    Filed: February 28, 2008
    Publication date: January 21, 2010
    Applicant: BASF SE
    Inventor: Hans-Peter Kaub
  • Publication number: 20090301673
    Abstract: The vessel in which the chips are pre-treated with steam (ST) is provided with a ventilation channel at the top of the vessel for the leading away of weak gases to a weak gas system (NCG). A simple safety system has been installed with the aim of guaranteeing that these weak gases do not reach a level of concentration at which these weak gases become explosive. The safety system has a control unit (CPU) that detects a process parameter that is indicative of the fraction of moisture in the weak gases and opens dilution lines that supply air for the dilution of the weak gases in the ventilation channel. It is appropriate that the dilution take place in stages, where the dilution lines are opened in stages with successively increasing temperature of the weak gases.
    Type: Application
    Filed: November 30, 2006
    Publication date: December 10, 2009
    Inventors: Vidar Snekkenes, Linda Almqvist, Daniel Trolin, Lennart Gustavsson
  • Publication number: 20090301674
    Abstract: A measuring device is provided that includes a camera, and an image-processing unit and a fractionating pipe. The receives a sample from recycled fibre pulp of a recycled fibre process and arranges the particles of the flowing sample in accordance with particle size. The measuring device processes the sample as at least two fractions according to particle size. The camera images at least one fraction. The image-processing unit receives images imaged by the camera and measures at least one parameter of an added substance in at least one imaged fraction.
    Type: Application
    Filed: April 19, 2007
    Publication date: December 10, 2009
    Applicant: METSO AUTOMATION OY
    Inventors: Jouko Niinimaki, Heikki Kumpulainen, Ossi Laitinen, Lauri Loytynoja
  • Patent number: 7609366
    Abstract: A material measurement system (500) includes a THz generator including at least one laser source (111) for emitting optical pulses, the optical pulses coupled to a THz emitter (51) operable for emitting pulsed THz radiation at a sample location on material while being processed (14) by a manufacturing system. A receiver (52) is operable to receive the optical pulses and to detect reflected or transmitted THz radiation from the sample location (14) synchronously with the optical pulses and provide electrical detection signals. Synchronizing optics (112, 113, 114) is operable to receive the optical pulses from said laser and provide the optical pulses to both the receiver (52) and the THz emitter (51).
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: October 27, 2009
    Assignee: Honeywell International Inc.
    Inventors: Ross MacHattie, Frank M. Haran, Graham I. Duck, David R. Jez, Dan Gordon
  • Publication number: 20090260767
    Abstract: A method of monitoring and controlling one or more types of hydrophobic contaminants in a papermaking process is disclosed. The methodology utilizes the measurement of hydrophobic dyes, which are capable of fluorescing and interacting with the hydrophobic contaminants. In addition, a method of determining the relative size of the hydrophobic contaminants is disclosed as well.
    Type: Application
    Filed: March 17, 2009
    Publication date: October 22, 2009
    Applicant: EVERY PENNY COUNTS, INC.
    Inventors: Alessandra Gerli, Laura M. Sherman, Michael J. Murcia
  • Patent number: 7604712
    Abstract: A method for the determination of a cellulosic-fibre property, namely, residual lignin content or Kappa number of chemical pulp, with the aid of a spectroscopic technique obtained over a range covering the visible and the near-infrared regions of the electromagnetic spectrum, comprising exposing the wet fibres to a light source covering a range in the visible region of 350 nm to 750 nm and a range in the near-infrared of 1100 nm to 2400 nm, reflecting light from the wet fibres, establishing a spectrum, comparing the spectrum with a known spectrum of the property and evaluating the comparison; the method has particular utility in a pulp manufacture line; an apparatus is described for carrying out the method.
    Type: Grant
    Filed: March 1, 2006
    Date of Patent: October 20, 2009
    Assignee: FPinnovations
    Inventors: Thanh P. Trung, Stephen P. A. Betts, Denys F. Leclerc
  • Publication number: 20090250180
    Abstract: Please delete the Abstract as originally filed and substitute therefore the attached substitute Abstract which is submitted in both marked-up and clean copy versions.
    Type: Application
    Filed: December 22, 2005
    Publication date: October 8, 2009
    Applicant: Metso Paper, Inc.
    Inventors: Erkki Kivekas, Ari Havu, Lasse Hernesniemi, Seppo Hiljanen
  • Publication number: 20090236059
    Abstract: A continuous digester comprises a wash zone having a plurality of individual wash screens disposed about an inner wall of the digester for the withdrawal of co-current downflow liquor from the wash zone. A conduit is connected in fluid communication between each of the wash screens and a collector for co-current downflow liquor withdrawn from the wash zone of the digester. A valve is interposed along the length of the conduit leading from each of the wash screens. The valve is operable between open and closed positions in response to a signal received from a temperature sensor associated with the conduit leading from each of the wash screens.
    Type: Application
    Filed: June 4, 2009
    Publication date: September 24, 2009
    Applicant: INTERNATIONAL PAPER COMPANY
    Inventors: DEAN KENNETH LAWRENCE, WAYNE HILL, STANISLAUS LEO LUDWIG, DAVID RICHARD CODE
  • Patent number: 7566382
    Abstract: A method and arrangement for controlling short circulation in a paper machine, in which the control of at least one property of the diluted fiber-containing pulp conducted to the headbox is based on consistency measurement or determination in high-consistency fiber-containing pulp, diluted pulp and/or white water. The amount of fiber-based fines in high-consistency fiber-based pulp, diluted fiber-based pulp and/or white water is determined, and the result obtained is used for controlling at least one property of the fiber-containing pulp to be conveyed to the headbox.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: July 28, 2009
    Assignee: Metso Automation OY
    Inventor: Matti Hietaniemi
  • Publication number: 20090141963
    Abstract: A method and an apparatus for measuring the depositability of particulate contaminants present in a pulp or paper mill fluid stream and evaluating interactions of such particulate contaminants with other contaminants collects the particulate contaminants on a suitable substrate, such as a plastic film coated with an adhesive or coated with organic contaminate, placed in contact with the pulp or paper mill fluid stream for at least five minutes up to several hours. The amount of contaminants collected on the substrate is quantified and evaluated by taking one or more scanned images of the substrate with a resolution of at least 2,000 dots per inch (DPI) and analyzing the scanned images with image analysis technique.
    Type: Application
    Filed: November 24, 2008
    Publication date: June 4, 2009
    Applicant: Hercules Inc.
    Inventors: Mark Laurint, Lloyd Lobo, Catherine L. Kelly
  • Publication number: 20090084510
    Abstract: A method to detect organic contaminants in pulp and fiber is described which uses hydrophobic dyes, such as fluorescent dyes.
    Type: Application
    Filed: May 15, 2008
    Publication date: April 2, 2009
    Applicant: BUCKMAN LABORATORIES INTERNATIONAL, INC.
    Inventors: Christopher D. Perry, Stuart Johns, Robert A. Cooper
  • Publication number: 20090056890
    Abstract: A continuous digester comprises a wash zone having a plurality of individual wash screens disposed about an inner wall of the digester for the withdrawal of co-current downflow liquor from the wash zone. A conduit is connected in fluid communication between each of the wash screens and a collector for co-current downflow liquor withdrawn from the wash zone of the digester. A valve is interposed along the length of the conduit leading from each of the wash screens. The valve is operable between open and closed positions in response to a signal received from a temperature sensor associated with the conduit leading from each of the wash screens.
    Type: Application
    Filed: October 30, 2008
    Publication date: March 5, 2009
    Inventors: Dean Kenneth Lawrence, Wayne G. Hill, Stanislaus Leo Ludwig, David Richard Code
  • Publication number: 20090025893
    Abstract: A method and an apparatus for determining the total peroxide content of a cellulose pulp suspension in the pulp suspension bleaching stage, wherein the bleaching chemical is peroxide. A sample is taken from the pulp suspension, which sample is measured in a measuring device (25, 25?). Before measuring, the pH of the sample is adjusted and after that the total peroxide content or the perhydroxyl content of the sample is measured, of which measurement the total peroxide content of the sample is determined.
    Type: Application
    Filed: February 7, 2007
    Publication date: January 29, 2009
    Applicant: Metso Automation Oy
    Inventors: Teuvo Peltomaki, Aleksi Pohjola, Pasi Antero Keinanen
  • Patent number: 7452444
    Abstract: This invention is directed to a method for cooking wood chips in a digester for the separation of wood fibers from their bonded state, the digester having a vertical centerline, a substantially circular cross-section, and a wash zone adjacent the bottom end thereof and a plurality of individual wash screens disposed about the inner wall of the digester for the withdrawal of liquor from the wash zone. In the first step of the method, substantially equal volumes of liquor are dynamically withdrawn from the wash zone through individual ones of the wash screens, while monitoring of the flow rate of liquor exiting the digester through individual ones of the wash screens. The monitored flow rate is used to increase or decrease the flow rate from screens to a value substantially equal to the flow rate of liquor from the digester through each of the screens.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: November 18, 2008
    Assignee: International Paper Company
    Inventors: Dean Kenneth Lawrence, Wayne Hill, Stanislaus Leo Ludwig, David Richard Code
  • Publication number: 20080277083
    Abstract: A method of monitoring and inhibiting scale precipitation and deposition from spent liquor in pulp mill evaporators and concentrators is disclosed. The method includes connecting a black liquor deposition monitor to a pulp mill evaporator or concentrator and measuring the thermal conductivity on the outer surface of the monitor. A controller interprets the measured thermal conductivity and determines a level of scale deposition. If the level of scale deposition is above a predetermined level, the controller is operable to introduce a scale-inhibiting composition to the spent liquor. The scale-inhibiting composition may include organic polycarboxylic acids; organic fatty acids; low molecular weight and polymeric aromatic acids; organic acid esters, anhydrides, and amides; low molecular weight and polymeric aliphatic and aromatic sulfonic acids; and low molecular weight and polymeric amines; and any combinations.
    Type: Application
    Filed: May 10, 2007
    Publication date: November 13, 2008
    Inventors: Sergey M. Shevchenko, Prasad Y. Duggirala, Dmitri L. Kouznetsov
  • Patent number: 7396437
    Abstract: Method and system for controlling web formation in the forming section of a paper machine includes measuring the amount of white water occurring during drainage in at least one drainage region of the forming section; and carrying out the web formation control on the basis of the white water measurement.
    Type: Grant
    Filed: February 27, 2003
    Date of Patent: July 8, 2008
    Assignee: Voith Paper Patent GmbH
    Inventors: Raymond P. Shead, Johann Moser
  • Patent number: 7390669
    Abstract: 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 particular, the present invention provides a useful method for simultaneously determining the concentrations of sodium hydroxide, sodium sulfide and sodium carbonate in aqueous kraft pulping liquors through use of an attenuated total reflectance (ATR) tunnel flow cell or optical probe capable of producing a ultraviolet absorbency spectrum over a wavelength of 190 to 300 nm. In addition, the present invention eliminates the need for manual sampling and dilution previously required to generate analyzable samples.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: June 24, 2008
    Assignee: Georgia Tech Research Corporation
    Inventors: Jian Li, Xin Sheng Chai, Junyoung Zhu
  • Patent number: 7387708
    Abstract: A method and apparatus for treating pulp in connection with a blow tank or a storage tank. The pulp is discharged from a batch digester and fed either to the upper or the lower part of a blow tank, depending on the consistency of the pulp being discharged from the digester.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: June 17, 2008
    Assignee: Sulzer Pumpen AG
    Inventors: Martti Heikkila, Kari Kovasin, Karl-Erik Röberg, Olavi Toukonummi
  • Patent number: 7384503
    Abstract: A method and system for determining trace oversize contaminant particles in a paper-making pulp employs a screen assembly having a screen housing with a screen mounted therein, and ports for introduction of aqueous pulp and rinsing and flushing fluids, and for withdrawal of screened aqueous pulp, the screen housing has no port designated for the sole purpose of removing accumulated contaminant particles from the screen housing; instead the port employed for introduction of aqueous pulp and which may also be employed for introduction of rinsing fluid to the housing, is employed as the flushing port for removal of contaminant particles.
    Type: Grant
    Filed: June 1, 2004
    Date of Patent: June 10, 2008
    Assignee: FPInnovations
    Inventors: John David Hoffmann, James Allen Olson
  • Patent number: 7351305
    Abstract: The digester and method are for the continuous cooking of pulp. At least two withdrawal positions (11E, 11D) for cooking fluid are arranged at different heights in the digester (10). The cooking fluid in the first and second position is withdrawn after the chips have had a retention time that differs by at least 10 minutes. The differential pressure between the positions is determined and when this exceeds a pre-determined level, a connection (17E) opens between these positions, establishing a flow parallel to a flow of cooking fluid between these positions in the digester. Several withdrawal positions are preferably connected in a common shunt system (17A-17F), with valves (18A-18F), controlled by the differential pressure, that are located between adjacent positions.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: April 1, 2008
    Assignee: Metso Fiber Karlstad AB
    Inventor: Vidar Snekkenes