Matches 151 - 200 out of 221 < 1 2 3 4 5 >
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4348256 Process for controlling the supply of delignifying and/or bleaching chemicals in the continuous delignification of lignocellulosic material  
A method is provided for controlling the supply of delignifying and/or bleaching chemicals in the continuous delignification and/or bleaching of lignocellulosic material such as wood and pulp in a...
4345913 Method and apparatus for determining the lignin content in pulp  
A method and a device for determining the lignin content in pulp by measuring the temperature increase on chlorination of a pulp sample with well-defined moisture content. The pulp sample is...
4342618 Method and apparatus on-line monitoring of fibre length of mechanical pumps  
A method and an apparatus for determining the fibre length distribution by weight of a pulp and a method and apparatus for determining absolute consistency are disclosed. The fibre length...
4318180 Method and apparatus for indicating the size distribution of particles in a flowing medium  
Methods and apparatus for determining the particle size distribution with respect to selected fraction classes in the direction of flow of a medium are provided in accordance with the teachings of...
4274911 Method of cooking cellulose material and preserving the heat and terpentine content of the cooking liquor  
A method of cooking cellulose material and effectively preserving the heat and terpentine content of the cooking liquor is disclosed. The cooking liquor is allowed to expand and the expansion steam...
4273612 Process and apparatus for continuously washing aqueous fibrous suspensions and controlling the volume of wash liquid  
A process is provided for continuously washing fibrous suspensions in aqueous suspending liquors containing dissolved impurities to remove such impurities by exchanging aqueous suspending liquid...
4253329 Fibre flexibility meter  
A method and apparatus are disclosed for obtaining an indication of fibre flexibility by spraying a pulp sample of preselected average fibre length against the bottom of a horizontal screen having...
4239590 Method of maintaining uniformity of fibrous material fed to a continuous digester  
A process for continuously monitoring and controlling a continuous process for digestion of cellulose utilizing a computer which is programmed to determine (1) the mass of wood being fed to the...
4236960 Process for controlling the degree of causticization in the preparation of white liquid from the chemicals recovered from black liquor  
Process is provided for controlling the degree of causticization of white liquor in its preparation from green liquor by the addition of calcium oxide, which comprises determining the sodium...
4234329 Method for the production of mineral fibers with unitary fiber length characteristics  
A sample of mineral fibers is dispersed in a liquid and viscosity of the dispersion is measured. The viscosity value provides a rapid measure of the length of the fibers. The measurement is...
4221632 Method and apparatus for determining the location of the chip level in a pulping digester  
A pulping digester contains a liquid digesting medium and wood chips dispersed in the medium. The level of the wood chips in the digester is normally below the top of the digester. As chips and...
4220498 Oxygen reactor systems pulp reject treatment  
A method and apparatus for the delignification of cellulosic fiber material to minimize the amount of reject material in the final pulp produced. The fiber material is digested, washed, oxygen...
4220499 Method for determining the relative quantity of shives in a stream of fibrous particles  
Relative shive incidence in a production flow line of paper pulp is continuously sampled and measured by means of a continuous flow, fiber induction device located within the production line to...
4207141 Process for controlling pulp washing systems  
A method of controlling the amount of a liquid shower flow introduced onto a slurry mat such as a pulp mat which is undergoing incomplete liquid separation on a vacuum filter drum. The flow rate of...
4198266 Oxygen delignification of wood pulp  
In a process for delignifying wood pulp with oxygen, a pulp slurry and oxygen are introduced into an elongated reactor having a plurality of gravitational fall zones at which oxygen is dissolved in...
4193840 Laboratory minidigesters and method of using the minidigesters  
A direct-steamed laboratory minidigester and a method of operating it are disclosed. This unit may be used to predict process parameters, e.g., yield and Kappa number, for operation of commercial...
4192708 Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical  
A method is provided for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in an aqueous liquor containing at least one chemical reactive with...
4162933 Exothermic heat as a means of determining the degree of delignification  
A process for continuously digesting cellulosic fibrous material wherein the degree of delignification of the cellulosic fibrous material in the digestion zone is continuously determined and...
4141784 Method and apparatus for controlling wood chip digester level  
A control system and a process is disclosed for a continuous wood chip downflow digestion system. The system maintains chip level in the top of the digester and maintains a consistency in the ratio...
4138313 Method and apparatus for continuously washing fibrous suspensions and controlling the volume of wash liquid  
A process and apparatus are provided for controlling the supply of aqueous suspending liquid in continuously washing fibrous suspensions in aqueous suspending liquors containing dissolved...
4135966 Method and device for equalizing the moisture content of porous material  
A process and apparatus for automatically maintaining the moisture content in a continuously conveyed batch of porous materials is described. The porous material is continuously fed through a...
4128454 System and method for gas phase pulp bleaching  
Wood pulp is bleached with chlorine dioxide gas. The gas is obtained by feeding a chlorine dioxide solution to a stripper. Shredded or fluffed pulp is exposed to a controlled amount of chlorine...
4106978 Method of preventing explosions using a smelt water explosion inhibitor  
A method of preventing a physical explosion caused by the contact of water with a molten material such as molten smelt and molten metal by the addition of a porous, high surface area powder which...
4105494 Process of gas-phase bleaching high consistency finely disintegrated pulp  
An improved process for gas-phase bleaching of cellulose pulp at high pulp consistency including in series a gas zone space beneath said gas zone for a column of fibrous material, a mixing zone and...
4096028 Feed forward control of dissolved solids in a countercurrent separation and washing zone  
A technique for controlling the amount of dissolved material in a slurry liquid stream containing dispersed particulate solids which is being continuously processed in a zone of countercurrent...
4086129 Process for controlling the intrinsic viscosity of sulfite pulp  
A process for accurately controlling the intrinsic viscosity of sulfite pulp at the termination of a digestion operation comprising predetermining the duration of digestion time required to obtain...
4078964 Method and apparatus for filling a pressure treatment vessel with a fiber material and liquid mixture  
A method and apparatus for filling a treatment vessel with a fiber material -- liquid mixture. A conventional feeder rotor, having a number of pockets extending therethrough, has each pocket...
4066492 Method and device for examining pulp for the presence of shives  
In a method for examining pulp for the presence of shives therein a suspension of the pulp is passed through a measuring duct with transparent walls and at least one beam of light having a...
4065348 Method and apparatus for detecting and controlling the caustic in paper pulp bleaching  
In a paper pulp bleach plant, the concentration of residual caustic in solution with the pulp slurry may be measured as a function of the voltage across cathode and anode poles of an electrolytic...
4058433 Conversion of sulfur in blank liquor to eliminate odorous emissions and facilitate the collection of sulfate soaps  
Oxidation and fixing of sulfur and sulfur compounds in weak black liquor is accomplished by methods which insure minimal odorous sulfur emissions and which facilitate the collection of sulfate...
4046621 Process for treating a slurry of cellulosic material  
A slurry of cellulosic material is diluted to a flowable consistency and subjected to a pressure differential on a permeable surface to increase the slurry consistency to a value between the...
4042328 On-line analyzer  
This invention relates to a continuous method for determining the concentration of a chemical component in a fluid stream, using the heat of reaction or enthalpy as a measure of the concentration,...
4013506 Method and apparatus for automatically and simultaneously controlling solution viscosity and brightness of a pulp during multi-stage bleaching  
A method and apparatus are provided for automatically and simultaneously controlling the solution viscosity and degree of brightness of a pulp during a bleaching process which employs a sequence of...
4012197 Titration apparatus and method therefor  
A titration apparatus and method therefor for determining the available alkali in a Kamyr or batch digester includes a sample vessel and a reference vessel suspended within the system itself in...
4010066 Method for improving heat economy in the batchwise digestion of lignocellulosic material by adjusting the level of free digestion liquor  
A method for improving heat economy in the batchwise digestion of lignocellulosic material especially when using a batch digester with a digestion or cooking liquor in which the digestion or...
3980517 Continuous on-machine control of bleaching chemicals  
In a multi-stage bleaching system in which respective bleaching chemicals are added to the stock in various stages, apparatus in which in the first stage in which chlorine is added to the brown...
3968006 Pulp bleaching process control using photocells to measure pulp brightness  
To achieve constant brightness from the chlorine stage of a wood pulp bleaching system, the chlorine addition rate is controlled by two white light photosensors positioned, respectively, 1-5...
3962029 Method of controlling the amount of chemicals in liquids used within the cellulose industry and related industries  
A method is provided for controlling the amount of oxidizing bleaching agents in liquors used within the cellulose industry, as in the bleaching of sulphite, sulphate, mechanical, chemimechanical,...
3946596 Leaf filter test and apparatus  
A simple and rapid test, and an apparatus for use therein, is described for measuring the filtration, or drainage, characteristics of a fibrous slurry. The results obtained by this test are...
3945917 Decolorizing method for waste kraft paper mill effluents  
Considerable reduction in color of a kraft paper mill effluent has been found with the addition of barium ions (Ba +2 ) to the effluent. Unlike the familiar lime decolorization process for kraft...
3941649 Process for obtaining a predetermined Kappa number in sulfate pulping  
A fully controllable process is provided for the manufacture of sulfate pulp having a predetermined degree of delignification and therefore a predetermined Kappa number. A sample of the pulping...
3888726 Process for determining alkali content in alkaline pulping liquor by a calorimetric measurement of the heat of partial neutralization of the pulping liquor  
A method is provided for determining the alkali content of alkaline pulping liquor such as sulphate pulping liquor, based on measuring calorimetrically the heat liberated by the pulping liquor when...
3886034 Process for determining the conditions needed in controllably obtaining sulfate pulp having a predetermined kappa number  
A process is provided for determining the conditions needed in controllably obtaining a predetermined degree of delignification and therefore a predetermined Kappa number in the manufacture of...
3873416 System for the continuous measurement of the weight-average fiber length of a pulp  
A method and apparatus are disclosed which permit the "on-line" measuring of the properties of a pulp, notably the weight-average fibre length of a mechanical pulp. The pulp is passed through a...
3802964 CONTINUOUS MEASUREMENT OF PULP PROPERTIES  
A method and apparatus are disclosed which permit the "on-line" measuring of the properties of a pulp, notably the specific surface, the weight-average fibre length and the consistency of a...
3781188 EXPERIMENTAL RESEARCH PULP DIGESTER ASSEMBLY  
Method of processing, digesting, or pulping samples of e.g. a body of wood chips under conditions reproducing experimental or production runs with precision. Samples are processed in sealed...
3652384 COUNTERCURRENT PULPING OF CELLULOSIC MATERIALS INCLUDING REGULATION OF ACTIVE CHEMICAL THEREIN  
A method is disclosed for the continuous treatment of wood chips in a downflow vertical digester by the alkaline process. Wood chips and black liquor are introduced near the upper end of the...
3650890 CONTINUOUSLY DETECTING THE DEGREE OF DELIGNIFICATION OF PULP  
A process for continuously detecting the degree of delignification of pulp in a continuous digester wherein pressure drop in a length of pipe located downstream of the digester, between a blow tank...
3630832 CONTROLLED ALKALINE SULFITE PULPING  
A controlled process of producing sulfite pulps from wood and other cellulosic material wherein the use of sodium sulfide is avoided and the process pH, i.e., the pH in situ or the so-called hot...
3607623 METER FOR MEASURING BRIGHTNESS OF BLEACHED FIBERS AND CONTROLLING THE BLEACHING PROCESS  
Apparatus for continuously controlling the bleaching of fibers and for continuously measuring and recording the brightness of light reflected from the bleached fibers having a bleaching tank, means...
Matches 151 - 200 out of 221 < 1 2 3 4 5 >