EP1785525A1 - Mesures d'un procédé papier/carton - Google Patents

Mesures d'un procédé papier/carton Download PDF

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Publication number
EP1785525A1
EP1785525A1 EP05110706A EP05110706A EP1785525A1 EP 1785525 A1 EP1785525 A1 EP 1785525A1 EP 05110706 A EP05110706 A EP 05110706A EP 05110706 A EP05110706 A EP 05110706A EP 1785525 A1 EP1785525 A1 EP 1785525A1
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EP
European Patent Office
Prior art keywords
sub
suspension
solid elements
distribution
paper
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Application number
EP05110706A
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German (de)
English (en)
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EP1785525B1 (fr
Inventor
Juan Carlos Cecchini
Petri Jetsu
Antti Poikolainen
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Valmet Automation Oy
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Metso Automation Oy
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Priority to EP20050110706 priority Critical patent/EP1785525B1/fr
Publication of EP1785525A1 publication Critical patent/EP1785525A1/fr
Application granted granted Critical
Publication of EP1785525B1 publication Critical patent/EP1785525B1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0018—Paper-making control systems controlling the stock preparation

Definitions

  • the invention relates to a process of paper/board production.
  • samples of furnish can be taken from various places of the process for measurements to be made on-line, in-line, based on sampling or in a laboratory (off-line).
  • the measurement results show certain properties of the furnish and if the furnish does not meet the desired target properties, the process can be adjusted.
  • the present measurements do not give good enough pieces of information on solid elements and their size distributions in furnish to be utilized, for example, in the prediction of formation and the quality of the end product in the process of paper/board production. Formation, for instance, depends on several factors such as raw material characteristics, mechanical actions on furnish and chemical treatments. Still, present solutions are poor to predict and control the formation.
  • An object of the invention is to provide improved methods and improved apparatuses for measurement of a paper/board process.
  • a method of estimating a quality of suspension with solid elements in water in a process of paper/board production comprising performing at least one sub-process in the process of paper/board production, each sub-process adjusting at least one property of the suspension.
  • the method further comprises performing a measurement of a distribution of solid elements in the suspension before a sub-process; performing a measurement of a distribution of solid elements in the suspension after the sub-process; and estimating a quality of the suspension as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • a method of predicting formation in a process of paper/board production comprising performing at least one sub-process in the process of paper/board production, each sub-process adjusting at least one property of a suspension with solid elements in water.
  • the method further comprises performing a measurement of a distribution of solid elements in the suspension before a sub-process; performing a measurement of a distribution of solid elements in the suspension after the sub-process; and predicting formation to be formed in a former as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • a method of predicting floc strength in a process of paper/board production comprising performing at least one sub-process in the process of paper/board production, each sub-process adjusting at least one property of a suspension with solid elements in water.
  • the method further comprises performing a measurement of a distribution of solid elements in the suspension before a sub-process; performing a measurement of a distribution of solid elements in the suspension after the sub-process; and predicting floc strength to be formed as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • a method of controlling a process of paper/board production comprising performing at least one sub-process of the process of paper/board production on suspension with solid elements in water, each sub-process adjusting at least one property of the suspension.
  • the method further comprises performing a measurement of a distribution of solid elements in the suspension before a sub-process; performing a measurement of a distribution of solid elements in the suspension after the sub-process; and controlling at least one sub-process as a function of a difference between the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • a method of predicting porosity in a process of paper/board production comprising performing at least one sub-process in the process of paper/board production, each sub-process adjusting at least one property of a suspension with solid elements in water.
  • the method further comprises performing a measurement of a distribution of solid elements in the suspension before a sub-process; performing a measurement of a distribution of solid elements in the suspension after the sub-process; and predicting porosity to be formed as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • an apparatus for estimating a quality of suspension with solid elements in water in a process of paper/board production comprising at least one sub-process adjusting at least one property of the suspension.
  • the apparatus comprises a measuring unit configured to perform a measurement of a distribution of solid elements in the suspension before a sub-process, to perform a measurement of a distribution of solid elements in the suspension after the sub-process, and to estimate a quality of the suspension as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • an apparatus for predicting formation of suspension with solid elements in water in a process of paper/board production comprising at least one sub-process adjusting at least one property of the suspension.
  • the apparatus comprises a measuring unit configured to perform a measurement of a distribution of solid elements in the suspension before a sub-process, to perform a measurement of a distribution of solid elements in the suspension after the sub-process, and to predict formation to be formed in a former as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • an apparatus for predicting floc strength of suspension with solid elements in water in a process of paper/board production comprising at least one sub-process adjusting at least one property of the suspension.
  • the apparatus comprises a measuring unit configured to perform a measurement of a distribution of solid elements in the suspension before a sub-process, to perform a measurement of a distribution of solid elements in the suspension after the sub-process, and to predict floc strength to be formed as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • an apparatus for controlling a process of paper/board production where suspension with solid elements in water is processed in at least one sub-process adjusting at least one property of the suspension comprises a measuring unit configured to perform a measurement of a distribution of solid elements in the suspension before a sub-process, to perform a measurement of a distribution of solid elements in the suspension after the sub-process, and a controller configured to control at least one sub-process as a function of a difference between the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • an apparatus for predicting porosity of suspension with solid elements in water in a process of paper/board production comprising at least one sub-process adjusting at least one property of the suspension.
  • the apparatus comprises a measuring unit configured to perform a measurement of a distribution of solid elements in the suspension before a sub-process, to perform a measurement of a distribution of solid elements in the suspension after the sub-process, and to predict porosity to be formed in the end product as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • the invention provides several advantages.
  • the distribution of solid elements of the suspension can be measured effectively in a plurality of sections of the process of paper/board production and the measurement results can be, if so desired, used to predict or control the quality of the web and the end product.
  • Each type of pulp fed to the paper making process can be refined in separate refiners 100 to 104.
  • the refiners can be cylindrical refiners or conical/double discs.
  • the output may be fed further into the paper making process through valves 106 to 110.
  • the valves may be adjusted adaptively such that a desired amount of each type of pulp can be metered to the process.
  • the amount of pulp metered may be controlled, for example, by a basis weight control or a grade change program.
  • a blending chest 112 and a machine chest 114 kraft and broke may be added to the pulp. Broke and kraft can be determined as papers that are re-pulped in this manner.
  • PCC Precipitated Calcium Carbonate
  • GCC Ground Calcium Carbonate
  • the blending chest 112 and the machine chest 114 can also be replaced by a separate mixing reactor (not shown in Figure 1).
  • pulp and furnish can be considered to be suspension with solid elements in water.
  • the solid elements may be fibers such as wood fibers, fiber fines, particles or fillers. Dissolved colloids promote the conformation of flocs which are enhanced with dosage of chemical additives.
  • Sand, air and other coarse materials can be removed from the furnish using cleaning devices 118, such as a sentrifugal cleaner, a deculator and a machine screen, and the furnish can pumped by a pump 120 to the headbox 122.
  • cleaning devices 118 such as a sentrifugal cleaner, a deculator and a machine screen
  • TA such as kaolin, calcium carbonate, talc, chalk, titanium dioxide, diatomite
  • a retention aid RA such as inorganic, inartificial organic or synthetic water-soluble polymers to name a few of TA and RA, can be added and mixed to the furnish in a desired manner. Metering each of these can be controlled by adaptively adjustable valves 124 to 126 or by adaptive adjustable dosing pumps.
  • micro/nano particles The purpose of the micro/nano particles is to improve, for example, the formation, surface properties, opacity, brightness, lightness and printing quality as well as to reduce the manufacturing costs.
  • Retention aids RA for their part, may improve, for instance, the retention of the fines and fillers as well as speed up dewatering in a desired manner.
  • the furnish may be fed through the slice opening 128 of the headbox to a former 130, which may be a fourdrinier in slow paper machines, a hybrid former in medium speed paper machines and a gap former in fast paper machines.
  • a former 130 water drains out of the web, and ash, fines and fibres are led to the short circulation.
  • the furnish is fed as a fibre web onto a wire, and the web can be preliminarily formed by fast water removal and pressed in a press 132.
  • the fibre web can also be primarily dried in dryers 134 and 136.
  • the paper machine which in this application refers to both paper and board machines, may also comprise a reel and size presses or a calender, for instance, but these parts are not shown in Figure 1.
  • the general operation of a paper machine is known per se to a person skilled in the art.
  • measurements can be made in at least two different places in the process of paper/board production. Between these at least two places, the suspension with solid elements in water is processed by a sub-process of the process of paper/board production.
  • the measurement points are marked with letter "M or M F " in Figure 1.
  • Figure 2 illustrates the measurements made before the head box 122. Let us assume that two components of retention aids are added somewhere after the deculator and before the headbox 116. In general, the order and the number of the added substances may be arbitrary.
  • Each addition can be considered a sub-process in the process of paper/board production.
  • the number of sub-processes may be one or vary from 1 to N, where N is a positive integer larger than one.
  • the furnish is measured before the addition of retention aids and/or micro particles.
  • the measurement 200 may measure a distribution of solid elements in the suspension before the sub-process(es).
  • a first sub-process 202 relating to an addition of a first component of the retention aid is performed.
  • the first component may be a polymer or micro particles.
  • a pump 204 may be used to proceed and mix the furnish.
  • the first component may be added before or after the pump 204.
  • a measurement 206 measures a distribution of solid elements in the suspension after the first sub-process.
  • Screening by a screen 208 may improve the mixing of the first component of the retention aid system as well reduce the size of the flocs by shear forces rate at this stage.
  • a second sub-process 210 relating to an addition of a second component of the retention aid is performed (if dual component or micro particle retention aid system is in use).
  • the second component may be a polymer or micro particles. If a polymer is added first, micro particles may be added second.
  • a measurement 212 measures a distribution of solid elements in the suspension after the second sub-process.
  • the measurements 200, 206 and 212 may be on-line measurements where a sample from the furnish in a pipe 218 is taken using a sampler 250 and fed to a measuring unit 220, which may output a signal to a control unit 222.
  • the measuring unit 220 may have several operational principles.
  • the measuring unit may form an image of the sample of the furnish such that the solid elements included in the suspension can be recognized in the image.
  • a numerical value which may be called a parameter, for each processable property of the solid elements can be formed by an image processing program run in the measuring unit.
  • a parameter describing a distribution of the sizes of the solid elements a parameter describing entanglement of fibers, such as the number of crossing points, may be formed.
  • the sample may be diluted in a possible sampler 250 before forming the image such that the consistency of the sample is proper for the image.
  • the image can be formed by taking a picture, for example, using a CCD-camera (Charge Coupled Device) or the like.
  • CCD-camera Charge Coupled Device
  • the measuring unit 220 may have a fractionating hose 250 to separate solid elements of different sizes into fractions with a good performance.
  • the fractionating hose 250 can be used to separate different fractions such as shives, flocs, fibers, fines and fillers.
  • the measuring unit 220 may be an optical apparatus which utilizes absorption, attenuation, scattering and/or depolarisation of optical radiation interacting with small particles.
  • a numerical value for each processable property of the solid elements can be formed by an image processing program run in the measuring unit 220.
  • a typical parameter in this kind of measurement is a parameter describing the size distribution of the solid elements.
  • the measuring unit 220 may also measure consistency of small samples such that a possible agglomeration of solid material in the suspension, such as a floc, may be recognized from the average consistency of the sample.
  • This kind of measurement can give an estimate of distribution of the solid elements in the suspension.
  • a shift in the particle distribution indicates that particles may change their sizes by growing or shrinking in the sub-process (depending on the type of retention aid component added, polymer or micro particles respectively).
  • the measurement can be an optical measurement. If the consistency measurement is complemented with a CCD camera, an image analysis is required to characterize the flocs conformation.
  • the measuring unit 220 may predict formation and/or porosity to be formed in a former 130 as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • the distributions before and after a sub-process can be parameters in a prediction model, which may be a mathematical expression describing dependency between distributions and the formation and/or porosity.
  • the prediction model may also take into account the number of crossing points in a floc.
  • cationic polymer enhance retention of fines as well as promote further entanglement of fibers resulting in flocculation.
  • the flocs are assumed to become stronger when water is removed and tighter when a suitable polymer or a combination of polymer and micro/nano-particle is added. If shear forces (i.e. mechanical refining) are applied, flocs tend to become smaller or smoother.
  • a base of a model describing the behaviour of flocs with respect to certain sub-processes can be as follows. When a suitable polymer is added to suspension, flocs increase in size.
  • flocs decrease in size.
  • flocs decrease in size but also increase in number.
  • flocs decrease strongly in size (more than without shear forces) but increase in number.
  • the floc structure may relate, for example, to fiber crossings. These measurements also enable to predict or to estimate the quality of the end product (paper or board). The measurements further enable control of formation, floc strength and/or porosity and the quality of the end product.
  • the measured floc sizes and structures can be linked to formation patterns, such as cloudy, granny, smooth, etc., and their numerical values. For example, beta formation decreases when formation improves.
  • the mathematical expression of the prediction model can be related to a formation factor FF which describes the quality of formation and is also related to the quality of the end product (paper or board).
  • the information on distributions before and after each sub-process can be utilized to control at least one sub-process in the process of paper/board production.
  • the sub-process that is controlled can be the same as the measured one or a different one.
  • Figure 3 illustrates an embodiment relating to the blending chest 112.
  • kraft and broke are added to the pulp in the blending chest 112.
  • the main pulp could be considered to form from one fresh pulp feed or M fresh pulps feeds to the machine chest, where M is a positive integer larger than 2.
  • the measuring unit 220 may perform on-line measurements 300 to 306 of pulp, kraft and broke before and after they enter the sub-processes (addition of kraft can be considered one sub-process and addition of broke can be considered another sub-process) in the blending chest 112.
  • the measurements relate to a distribution of solid elements in the suspension in a similar manner to that described in Figure 2.
  • a quality of the suspension may be estimated as a function of the distribution of solid elements in the suspension before and after the sub-process(es). At least one sub-process can be taken into account but also many or all sub-processes can be utilized.
  • the estimation of quality can be based on a mathematical model which includes the superposition of mass fractions and the rates of fibre fines included in each component or sub-process.
  • a mass fraction and fibre fines amount can be defined as a reference and the blending can be controlled according to the reference and the measurements.
  • Abs m is a fines fraction distribution is a measured current i and Depo m is a long/coarse fraction distribution is a measured current i.
  • the measurement can take place after the blending chest 112.
  • the information on distributions before and after each sub-process can be utilized to control at least one sub-process in the process of paper/board production.
  • the sub-process that is controlled by the controller 222 receiving a signal relating to measurements from the measurement unit 220 can be the same as the measured one or a different one.
  • FIG 3 there is also shown a sub-process of adding and mixing polymer to a sample of the furnish.
  • the effect of this sub-process can be determined from measurements 306 and 308 made before and after the sub-process.
  • the flocculation tendency of the sample can be determined before or after mixing the furnish with filler(s) in the machine chest 114.
  • the machine chest 114 operation can be controlled by these measurements, which also indicates the possible range of retention aid dosage.
  • the control may be performed such that a retention polymer can be added according to the retention needs and the ratio between retention polymer and micro particles can be formed according to the formation needs.
  • formation can be predicted, the additions of the components to the furnish can be determined using the predicting model. If predicted formation and measured formation in the ready made paper do not meet, the model can be modified (model may be adaptive) or a feedback is used to correct the model prediction methods in a similar manner to a known MP (Model Predictive) control technology.
  • MP Model Predictive
  • Figure 4 illustrates measurements M F made in the former 130.
  • a heavy drainage and particle losses take place in the former 130.
  • filler distribution changes and a considerable filler loss takes place at different vacuum units and loadable blade area.
  • the measuring unit measures the drainage from at least two places in a multifoil shoe (or a vacuum chamber) 400, a loadable blade unit 402, a wire 404 and between a forming roll 406 and a breast roll 408.
  • the rolls and their configuration/arrangement are not limited to those shown in Figure 4.
  • the former 130 may not necessarily include a forming/sucking roll (BelBaie configuration BBV or a belshoe or an equivalent).
  • the measurements made in at least two places may give information on distribution and changes in distribution of solid elements in the suspension on the wire 404. This information can be utilized in a similar manner as in the examples explained relating to the previous figures.
  • formation can be predicted, the quality of suspension and/or the end product can be estimated or at least one of the sub-processes can be controlled for achieving a proper papermaking suspension to evaluate fibre fines and filler particle losses. This may be utilized in a proper z-profile control of a paper web.
  • Figure 5 illustrates a possible kind of shift in the size distribution of large solid elements (mainly fibers) in suspension treated with a refiner.
  • the signal strength is in y-axis and size is in x-axis, both in arbitrary scale.
  • the depolarisation curve 500 measured before the treatment indicates a distribution that refers to larger solid elements in average than the depolarisation curve 502 relating to a distribution measured after the treatment. Note that the size of solid elements tend to decrease when the sub-process is an addition of a single polymer.
  • Figure 6 illustrates a possible kind of shift in the size distribution of small solid elements (mainly fines and other micro particles) in suspension treated with a refiner.
  • the signal strength is in y-axis and size is in x-axis, both in arbitrary scale.
  • the scattering curve 600 measured before the treatment indicates a distribution that refers to larger solid elements in average than the scattering curve 602 relating to a distribution measured after the treatment. Note also here that the size of solid elements tend to decrease when the sub-process is an addition of a single polymer.
  • Figure 7 illustrates a method of estimating a quality of suspension.
  • step 700 an on-line measurement of a distribution of solid elements in the suspension before a sub-process is performed.
  • step 702 an on-line measurement of a distribution of solid elements in the suspension after the sub-process is performed.
  • step 704 a quality of the suspension is estimated as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • Figure 8 illustrates a method of predicting formation.
  • step 800 an on-line measurement of a distribution of solid elements in the suspension before a sub-process is performed.
  • step 802 an on-line measurement of a distribution of solid elements in the suspension after the sub-process is performed.
  • step 804 formation to be formed in a former is predicted as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • Figure 9 illustrates a method of predicting floc strength in a process of paper/board production.
  • step 900 an on-line measurement of a distribution of solid elements in the suspension before a sub-process is performed.
  • step 902 an on-line measurement of a distribution of solid elements in the suspension after the sub-process is performed.
  • step 904 floc strength to be formed is predicted as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • Figure 10 illustrates a method of controlling a process of paper/board production.
  • step 1000 an on-line measurement of a distribution of solid elements in the suspension before a sub-process is performed.
  • step 1002 an on-line measurement of a distribution of solid elements in the suspension after the sub-process is performed.
  • step 1004 at least one sub-process is controlled as a function of a difference between the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • Figure 11 illustrates a method of predicting porosity in a process of paper/board production.
  • step 1100 an on-line measurement of a distribution of solid elements in the suspension before a sub-process is performed.
  • step 1102 an on-line measurement of a distribution of solid elements in the suspension after the sub-process is performed.
  • step 1104 porosity to be formed in the end product is predicted as a function of the distribution of solid elements in the suspension before the sub-process and the distribution of solid elements in the suspension after the sub-process.
  • the prediction model, the estimation and the control operations illustrated in Figures 7, 8, 9, 10 and 11 may be realized as a computer program.
  • the computer program may be stored on a computer program distribution medium readable by a computer or a processor.
  • the computer program medium may be, for example but not limited to, an electric, magnetic, optical, infrared or semiconductor system, device or transmission medium.
  • the medium may be a computer readable medium, a program storage medium, a record medium, a computer readable memory, a random access memory, an erasable programmable read-only memory, a computer readable software distribution package, a computer readable signal, a computer readable telecommunications signal, and a computer readable compressed software package.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013045325A1 (fr) * 2011-09-29 2013-04-04 Voith Patent Gmbh Procédé de fonctionnement pour une préparation de pâte à papier
AT521088A5 (de) * 2016-12-05 2020-05-15 Valmet Automation Oy Gerät und Verfahren zur Messung einer Suspension und zur Steuerung eines Prozesses einer Suspension

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4243319A (en) * 1977-01-24 1981-01-06 Nekoosa Papers, Inc. Optical property measurement system and method
US4574624A (en) 1983-07-06 1986-03-11 Valmet Oy Ultrasonic echo sounding device for observing web formation and pulp suspension flow in a paper machine
US5825653A (en) * 1997-03-14 1998-10-20 Valmet Corporation Method for overall regulation of a former of a paper machine or equivalent
WO1999042656A1 (fr) * 1998-02-23 1999-08-26 Valmet Corporation Systeme de regulation d'une machine a papier
US6319362B1 (en) * 1997-11-25 2001-11-20 Metso Paper Automation Oy Method and equipment for controlling properties of paper
WO2003040465A1 (fr) 2001-11-09 2003-05-15 Metso Automation Oy Procede et appareil pour ajuster le fonctionnement d'une partie toile
EP1361309A1 (fr) * 2002-05-03 2003-11-12 Metso Paper, Inc. Procédé de contrôle de la qualité d'une bande de papier

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4243319A (en) * 1977-01-24 1981-01-06 Nekoosa Papers, Inc. Optical property measurement system and method
US4574624A (en) 1983-07-06 1986-03-11 Valmet Oy Ultrasonic echo sounding device for observing web formation and pulp suspension flow in a paper machine
US5825653A (en) * 1997-03-14 1998-10-20 Valmet Corporation Method for overall regulation of a former of a paper machine or equivalent
US6319362B1 (en) * 1997-11-25 2001-11-20 Metso Paper Automation Oy Method and equipment for controlling properties of paper
WO1999042656A1 (fr) * 1998-02-23 1999-08-26 Valmet Corporation Systeme de regulation d'une machine a papier
WO2003040465A1 (fr) 2001-11-09 2003-05-15 Metso Automation Oy Procede et appareil pour ajuster le fonctionnement d'une partie toile
EP1361309A1 (fr) * 2002-05-03 2003-11-12 Metso Paper, Inc. Procédé de contrôle de la qualité d'une bande de papier

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013045325A1 (fr) * 2011-09-29 2013-04-04 Voith Patent Gmbh Procédé de fonctionnement pour une préparation de pâte à papier
CN103842580A (zh) * 2011-09-29 2014-06-04 沃依特专利有限责任公司 浆料制备装置的运行方法
CN103842580B (zh) * 2011-09-29 2017-03-01 沃依特专利有限责任公司 浆料制备装置的运行方法
EP2761080B1 (fr) 2011-09-29 2017-05-17 Voith Patent GmbH Procédé de fonctionnement pour une préparation de pâte à papier
AT521088A5 (de) * 2016-12-05 2020-05-15 Valmet Automation Oy Gerät und Verfahren zur Messung einer Suspension und zur Steuerung eines Prozesses einer Suspension
SE543483C2 (en) * 2016-12-05 2021-03-02 Valmet Automation Oy Apparatus and method for measuring suspension and controlling process of suspension
AT521088B1 (de) * 2016-12-05 2021-04-15 Valmet Automation Oy Gerät und Verfahren zur Messung einer Suspension und zur Steuerung eines Prozesses einer Suspension

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