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8877010 Modelling of a property of paper, paperboard or board  
Properties of an end product, such as paper, paperboard or board, are important for the user of the end product. To be able to manufacture an end product of desired quality, it is important to...
8679293 System and method for optimizing lignocellulosic granular matter refining  
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...
8052843 System and a method for the steam pre-treatment of chips in association with the production of chemical cellulose pulp  
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...
7387708 Process for feeding pulp into a blow tank or storage tank  
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...
7381303 System and method for controlling a thermo-mechanical wood pulp refiner  
Thermomechanical pulp is an important process for producing fibrous mass used in papermaking. A two-level control strategy that stabilizes and optimizes the refining process has been developed....
7294227 Method and system for the treatment of pulp prior to ozone bleaching  
A system for treating pulp comprises a dewatering device (2) for dewatering the pulp to a fiber concentration of at least 20%, a closed pulp-shredding vessel (16) for shredding the dewatered pulp,...
7204914 System and method for controlling a processor including a digester utilizing time-based assessments  
A system for controlling a processor having at least one sampling port connected to a stage of the processor in order to sample a reactant product from the processor. The system includes a...
7082348 Computer based method and system for controlling an industrial process  
A computer based method for controlling an industrial process that includes at least two unit processes, including the steps of directly controlling the process by a control model including one or...
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...
6778936 Consistency determining method and system  
A system (30) and method for determining stock consistency and for using consistency as a process variable to control some aspect of operation of a refiner (32) used to refine stock. The system...
6772036 Control system using process model  
A control system is provided for controlling a process for making paper or paper pulp. The process has a process product output at an end of the process. The controls include a process variable...
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...
6368453 Chip feeding to a comminuted cellulosic fibrous material treatment vessel  
In the feeding of a slurry of comminuted cellulosic fibrous material to a digester (continuous or batch) in the production of chemical pulp, one of the tanks used in the feed system (which...
6273994 Method and device for measuring bleach requirement, bleachability, and effectivenss of hemicellulase enzyme treatment of pulp  
The present invention relates to a device and method for measuring the bleach requirement and bleachability of pulp in a pulp mill. The invention enables pulp mill operators to better control...
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...
6210532 Means for conveying pulp having differential pressure control  
A walled passageway, having openings therein only at opposite, inlet and outlet ends thereof, has a shaft journalled therein. The shaft carries a screw thereon for moving shredded pulp through the...
6153050 Method and system for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage  
A method for controlling the addition of bleaching/delignifying reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching stage. The present method...
6143134 Chip spreader for air-lock feeder  
By establishing a relatively flat, for example, non-sharply conical, top profile of wood chips in a treatment vessel (such as a chip bin), the chips will be more uniformly steamed or otherwise...
6132556 Method of controlling pulp digester pressure via liquor extraction  
A method of controlling the pressure of a vertical continuous comminuted cellulosic fibrous material (wood chip) digester is provided using a pressure-control extraction in a zone relatively...
6017420 Apparatus for automated monitoring of pulp retention time using an iodine salt tracer  
An automated tracer 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...
5995701 Optical-fiber environment variable apparatus, optical-fiber extracting apparatus, and optical-fiber extracting system  
To enable extraction of one specific optical fiber from a plurality of optical fibers at remote sites. An environment variable apparatus is mounted to provide a temperature difference at a...
5824188 Method of controlling the pressure of a continuous digester using an extraction-dilution  
The sulfide ion concentration and sulfidity of kraft cooking liquor during kraft cooking of cellulose pulp is selectively increased. After treatment in a first treatment zone in which impregnation...
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...
5736004 Control scheme for rapid pulp delignification and bleaching  
A process control method for adjusting chemical application in response to the pulp brightness and/or lignin content is realized by utilizing a coupled control feedforward, feedback or combination...
5674360 Method and apparatus for steam packing/presteaming a batch digester  
A batch digester loading method is described wherein a flow stream of steam enters the digester near the bottom thereof as a flow stream of wood chips enters through the top filler neck. Steam...
5635025 Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute  
In a continuous digester system the chip feed equipment is greatly simplified by substituting a single vertical vessel for the conventional chip bin, steaming vessel and chip chute. An outlet at...
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...
5622598 Chip pumping to a digester  
A system for feeding wood chips entrained in cooking liquor to a high pressure feeder connected to a continuous digester includes a vertical treatment (e.g. steaming) vessel, a metering device...
5616214 Determination of sodium sulfide and sulfidity in green liquors and smelt solutions  
A rapid method is provided for the on-line determination of sodium sulfide concentration and/or percent sulfidity in green liquors or smelt solutions used for the production of either kraft or...
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...
5547545 Digester temperature distribution control system  
A digester temperature distribution control system comprises an optical fiber type temperature measuring unit utilizing the Raman scattering effect, reference temperature measuring unit, reference...
5547546 Chip bin with steaming control and a gas vent containing a vacuum and pressure relief device  
A chip bin for wood chips in a continuous digester system includes internal steaming that is controlled in response to both the interior temperature across the level of chips in the bin, and the...
5401361 Completely coutercurrent cook continuous digester  
A conventional continuous digester is modified so as to provide a countercurrent cook throughout the entire height of the digester. Instead of connecting an upper mid-point extraction screen to a...
5382326 Ozone mixing test apparatus  
Laboratory equipment for practicing experiments and mixing ozone with medium consistency cellulosic pulp allows precise control of the timing and amount of ozone injected into the mixer, providing...
5364505 Pressurized ozone pulp delignification reactor and a compressor for supplying ozone to the 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...
5308504 Viscosity based tank level and flow control systems  
Tank level and flow control systems wherein the presence of materials or solutions of known viscosity ranges in a tank or flow stream is detected by using viscosity detection devices. Automatic...
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...
5236554 Digester having plural screens with means for controlling liquid injection and withdrawal  
Enhanced uniformity of treatment of the material with a treatment liquid in a continuous treatment vessel, is provided. The invention is particularly applicable to the treatment of comminuted...
5167769 Particle level sensor  
A sensor for the detection of wood chip level in a digester, for example, a Kamyr digester, which consists of: (a) a probe, several meters long, vertically mounted inside the top part of the...
5093773 Processing system with heat recovery  
A processing system utilizing heat recovery has a plurality of digesters in which products such as wood chips may be reacted at high temperature and pressure to form pulp suitable for use in the...
5032977 System for modeling and control for delignification of pulping  
A method and apparatus for controlling the delignification process by monitoring and minimizing variations in the Kappa Number and the digester residual chemical concentration. A parameter...
4990219 Apparatus for controlling the degree of cooking in a digester  
A method and apparatus for controlling the delignification process by monitoring and minimizing variations in the Kappa Number and the digester residual chemical concentration. A parameter...
4963229 System and method for continuous measurement of pulp consistency in a blowline of a continuous pulp digester  
A system and method to continuously determine the pulp consistency in the discharge blowline (112) of a continuous pulp digester (100) having a gamma gauge (116) disposed adjacent to the blowline...
4840703 Method for controlling an oxygen bleaching  
A method for controlling an oxygen-bleaching process of lignocellulosic pulp to a desired degree of delignification.The pulp is passed at a substantially constant temperature into a bleaching...
4780182 Continuously monitored apparatus and method for determining degree of completion of pulp cook  
A method and suitable apparatus for periodically analyzing pulp stock, including wood pulp and water, in a pulp digester, to determine the amount of cooking to which the pulp has been subjected....
4752357 On-line apparatus for determining degree of completion of pulp cook  
A method and suitable apparatus for periodically analyzing pulp stock, including wood pulp and water, in a pulp digester, which may or may not be part of a paper machine, to determine the amount...
4568422 System for recovering heat in an alkaline pulp digesting process  
A system for recovering heat in a pulp digesting process is disclosed. The system includes apparatus for blowing a pulp and liquid mixture from a digester to a container such as a blow tank or...
4521380 Apparatus for dilution of pulp  
A pulp diluting apparatus has a cylindrical vessel having the top portion thereof covered with a lid having a pulp inlet, a bearing mounted on the center of the lid, a lower steady support bearing...
4517053 Apparatus for sampling paper pulp liquor  
In a paper making process the liquid fraction of wood pulp stock liquor is sampled between the bleaching and caustic extraction stages and after caustic introduction to regulate the amount of...
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...

Matches 1 - 50 out of 101 1 2 3 >