WO2004072367A1 - 抄紙機の制御方法、制御装置、プログラム及び記憶媒体 - Google Patents
抄紙機の制御方法、制御装置、プログラム及び記憶媒体 Download PDFInfo
- Publication number
- WO2004072367A1 WO2004072367A1 PCT/JP2004/000753 JP2004000753W WO2004072367A1 WO 2004072367 A1 WO2004072367 A1 WO 2004072367A1 JP 2004000753 W JP2004000753 W JP 2004000753W WO 2004072367 A1 WO2004072367 A1 WO 2004072367A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- control
- paper
- interference
- retention
- ash content
- Prior art date
Links
Classifications
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
- D21H23/06—Controlling the addition
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
Definitions
- the present invention relates to a method for controlling a paper machine, a control device for a paper machine, and the like, and more particularly to an improvement in retention and ash content control in a papermaking machine.
- Retention in the paper part process of the paper machine is the ratio of the raw material that pulp material (mainly pulp containing ash) that erupted from the head box of the paper machine onto the filtration wire of the wire part yields on the wire.
- Approximate calculation is made using the following formula using the concentration of raw material supplied to the headbox (C IntelB) and the concentration of white water (c ww ) that is filtered from the wire 1 and falls into the white water silo below the wire 1. be able to.
- Retention ⁇ (C H B _ C W w) / C "B ⁇ X 1 0 0% Formula 1
- the retention value is an important indicator of the convex shed determines good or bad of the paper machine wire per Bok operations
- retention can be controlled by a very small increase or decrease in the addition flow rate of a high-molecular-weight retention aid added in a small amount to the raw material supplied to the head box as one method. In the retention control, this retention is controlled.
- the fluctuation of the white water concentration (C ww ) is used as the monitoring end of the retention.
- the retention value itself in Equation 1 is used, and A control mode is adopted in which the addition flow rate of the retention aid is increased or decreased while monitoring the state of all concentrations (see Non-Patent Documents 2, 3, and 4).
- the reason why the total concentration of white water is used instead of the retention value itself is that if the total concentration of white water is kept constant, the retention can also be kept constant. Even if it is kept constant, if the concentration of the raw material supplied to the head box (C H B) and the concentration of white water (C w w) change greatly at the same rate at the same time, use Equation 1 as an index. The reason is that the retention value is apparently calculated as a stable constant value, making it impossible to stabilize the wet part.
- the retention control is a control that adjusts the yield of pulp raw material supplied from the head box onto one wire part, and measures the total concentration of white water flowing down from the wire part online using a special low concentration meter. This is performed by constructing a feedback control loop that increases or decreases the amount of the yield improver added to the pulp raw material so that the value matches a preset target value.
- a PID controller controller
- the control loop is used to implement PI control (proportional operation control + integral operation control). , 3).
- This PID controller is often used in the control loop of the process control of chemical plants and pulp and paper plants.On-line measurement of the state quantities such as temperature and flow rate to be controlled by sensors mounted on the control end. If there is a deviation between the measured value and the target value, operate the magnitude calculated by the PID controller.
- Control A basic method is used in which a signal is output to the operating end of a steam valve or flow valve, for example, and one-on-one control is performed in a feedback loop using feedback control. In recent large-scale plants, a large number (hundreds to thousands of loops) of this type of control loop has been incorporated into the DCS (Distributed Control System) of the central control room, and the actual plant has been centrally controlled online. I have.
- DCS Distributed Control System
- ash components such as calcium carbonate and talc of about 0 to 20% are prescribed according to the prescription in order to improve surface properties and printability in accordance with the type of paper.
- the amount of ash is controlled as the ash content in paper at the time of manufacture.
- ash content control is conventionally performed using a BM meter (Basis Weight and Moisture Measurement Sensors) in order to maintain the ash content of the product paper at a specified value.
- BM meter Basis Weight and Moisture Measurement Sensors
- Non-Patent Document 1 research has been reported on the problem of mutual interference between multiple control loops by actively canceling the mutual interference using multivariable control called model predictive control (for example, Non-Patent Document 1).
- the method using this model predictive control is a control method that accurately and comprehensively cancels not only the ash content and retention in paper, but also the adverse effects due to mutual interference between many other variables in the process.
- the control method is complicated, and large cost is required for system introduction.
- the present applicant has conducted a short-period control of the addition rate of the yield improver in the past using a PID controller, so that the formation of paper products (basis weight fluctuation) has been achieved. Due to concerns about deterioration, we propose a control method that changes the yield improver addition rate over a long period of time (a control method that changes the yield improver addition amount into a ramp over about 30 minutes). However, because of the gradual control method, in this case, the above-described mutual interference did not occur between the retention control and the ash content control in paper (for example, see Patent Document 1). , Non-Patent Document 4).
- the present invention has been made in view of the above-mentioned problems of the prior art.Even when the retention control and the ash content control in paper are performed in a short cycle using a PID controller, a BM meter, etc., both controls are performed. It is an object of the present invention to provide a control device for a paper machine which can easily prevent problems such as hunting due to mutual interference between the two with a simple and inexpensive configuration and can accurately control retention and ash content. You.
- a first aspect of the present invention is a method for controlling a paper machine, in which at least a retention in a wet paper and an ash content in a paper are automatically controlled in the paper machine, wherein a feedback for automatically controlling the retention is provided.
- Papermaking characterized by incorporating a non-interference control function between the loop and the feedback loop, which automatically controls the ash content in paper, to counteract the effects of mutual interference between the two loops.
- the automatic control of the retention comprises measuring a white water concentration (a concentration of white water generated by dehydration at the wire part) of the wire part in the outlet part.
- the automatic control of the ash content in the paper is a control to increase or decrease the amount of the yield improver added to the raw material according to the white water concentration.
- the ash content in the paper is measured after the paper is dried. It is characterized by control to increase or decrease the amount of ash added to the raw material according to the ash content.
- the non-interference control function is configured to simultaneously determine an amount of interference between the two feedback loops.
- the present invention is characterized in that the gain of a non-interference element for performing static characteristic compensation for instantaneous compensation is used.
- the non-interference control function compensates for an interference amount in which the two feedback loops interfere with each other in consideration of a time delay. It is characterized by using a non-interference element for performing dynamic characteristic compensation.
- the white water concentration of the wire part measured in the automatic control of the retention is filtered from the wire of the wire part.
- the concentration of white water flowing down to the white water silo below the wire.
- concentration of the white water the total concentration of the white water is normally used, but the pulp concentration and the ash concentration in the white water can also be used.
- the total concentration of white water is the sum of pulp concentration in white water and ash concentration in white water.
- a control device for a paper machine wherein the automatic control system controls the retention and the ash content rate in the paper at least in an outlet part of the paper machine, wherein the automatic control system includes: A feedback loop for performing control, a feedback loop for automatically controlling the ash content in paper, and a non-interference control unit incorporated between the two feedback loops so as to cancel the influence of mutual interference between the two feedback loops.
- the feedback loop that performs the automatic control of the retention includes: a densitometer that measures the white water concentration of the wire part in the wet part; and a detection by the densitometer.
- a control unit for sending a control signal to a retention operation terminal in a paper machine process so as to increase or decrease the amount of a retention aid added to the raw material based on a deviation between the obtained white water concentration and a predetermined target value.
- Feedback for automatic control of ash content in paper An ash detecting means for measuring ash in the paper by an ash sensor after the paper is dried; and ash addition to the raw material based on a deviation between the ash detected by the ash detecting means and a predetermined target value.
- An ash control unit that outputs a control signal to an ash operating end in the paper machine process so as to increase or decrease the amount, wherein the non-interference control unit has a non-interference element that compensates for an interference amount that causes mutual interference. It is assumed that.
- the non-interfering element is a feed-forward compensating element that is input to a stage before each operating end of each of the feedback loops so as to compensate for an amount of mutual interference. It is characterized by being. According to a ninth aspect of the present invention, in the eighth aspect, the non-interfering element is based on a response block of a process by each feedback buckle and an interference block that causes mutual interference by both feedback loops. It is characterized by what is required.
- a tenth aspect of the present invention is a program for causing a computer to execute the control method according to any one of the first to fifth aspects.
- a eleventh aspect of the present invention is a storage medium readable by a computer in which the program described in the tenth aspect is stored.
- FIG. 1 is a diagram conceptually showing the overall configuration of a paper machine used in an embodiment of the present invention.
- FIG. 2 is a block diagram showing a ash content control loop in paper and a retention control loop in the control system of the paper machine shown in FIG.
- FIG. 3 shows the changes in the total concentration of white water, ash content in paper, and speed change in a conventional paper machine.
- FIG. 4 is a diagram showing the appearance of the flow rate of the additive and the yield improver, and shows the case where the ash content in the paper is controlled without performing the retention control.
- Fig. 4 is a diagram showing the changes in the total concentration of white water, the ash content in paper, the flow rate of addition of the retention aid, and the change in papermaking speed in a conventional paper machine. This shows a case where tension control and ash content rate control in paper are performed simultaneously.
- Fig. 5 shows the variation in the total concentration of white water, the ash content in paper, the flow rate of addition of the retention aid, and the papermaking speed when retention control and ash content control in paper were simultaneously performed by the control device in this embodiment. It is a diagram showing a situation of a change.
- FIG. 6 is a diagram schematically illustrating a response gain K :, a dead time Tl, and a time constant ⁇ 2 when a step input is applied in the process.
- FIG. 7 is a block diagram showing a state in which the ash content control loop in paper and the retention control loop are independent.
- FIG. 8 is a block diagram showing a state in which mutual interference has occurred between the ash content rate control loop in paper and the retention control loop.
- FIG. 1 is a diagram conceptually showing the overall configuration of a paper machine used in an embodiment of the present invention.
- the paper machine 1 shown here comprises a paper machine process 2 for executing a paper making process described later, and a control system 3 for controlling the paper machine process 2.
- a paper machine process 2 for executing a paper making process described later
- a control system 3 for controlling the paper machine process 2.
- low-concentration seed material ejected from the head box 4 is dewatered by a wire part 6 equipped with a wire 5 that rotates endlessly. Remove the remaining pulp mat Send to Press Part 7, where dewatering is further performed. The pulp mat dewatered in the press part 7 is heated and dried in the subsequent dryer part 8 and then wound up in the reel part 9 to form a paper roll.
- the white water flowing down from the wire 5 due to the dewatering action of the wire part 6 is temporarily stored in the white water silo 10 and then supplied to the head box 4 by the pump 11 from here. It constitutes the white water circulation system 12.
- the seed material supplied by the pump 13 is supplied via the seed box 14 and the valve (seed valve) 15. It is sent to the headbox 4 together with the white water sent from the white water silo 10. '
- a path from the pump 11 to the headbox 4 in the white water circulation system 12 includes an ash supply path 16 for supplying ash from an ash supply source (not shown) by the pump 16a, and a pump 17
- a yield improver supply path 17 for supplying a yield improver from a yield improver supply source (not shown) is connected.
- An ash control valve 18 and a flow meter 19 are connected to the ash supply path 16, and the opening degree of the valve 18 is controlled by the flow rate detected by the flow meter 19, which will be described later. It is controlled by the ash addition flow rate control unit 20 so that it becomes a value corresponding to the control signal corresponding to the manipulated variable output from the system 3.
- the yield improver supply path 17 is connected to a yield improver control valve 21 (which may be controlled by a constant volume pump) and a flow meter 22.
- the valve 21 has an opening degree of
- the yield improver addition flow rate control unit 23 controls the flow rate detected by the flow meter 22 to a value corresponding to the control signal corresponding to the manipulated variable output from the control system 3.
- the concentration of the white water flowing down into the white water is detected by a low concentration meter (white water concentration detection means) 24, and the detected value is input to the control system 3.
- the optical axis is rotated by about 90 ° and polarized light is used. Difference in scattering form of laser light due to fine particles of component, amount of backscattered light, amount of xenon light absorbed by lignin component in pulp while passing through sample to distinguish fine pulp from ash component, and backward
- a total of 14 types of detection signals such as the amount of scattered light from reflections, are taken into the CPU connected to the sensor, and are compared with the measured values obtained by manual analysis. It uses a sensor (made by Metso Automation Kajaani, Finland) that selects the process and statistically determines the coefficient value of the regression model equation and converts it to each concentration.
- the measurement range measured by the low concentration meter 24 is: total concentration ⁇ 1.5%, ash concentration ⁇ 0.8%.
- the concentration of feedstock to the head box 4 and the concentration of white water that is filtered from the wire 15 and flows down to the white water sieve opening 10 that could only be known by offline measurement until now Can separate the pulp component and the ash component online and measure the concentration.
- the yields remaining on the wire due to the dehydration of each raw material in the wire part 6 (Part 6) (1) Retention, (2) Pulp pretension, and (3) Ash retention can also be known continuously by online calculation.
- a measurement frame of a BM meter equipped with a plurality of sensors and a sensor head 25b are installed.
- 5b and the control unit 25a are measured.
- the ash sensor provided on the sensor head 25b that measures the ash content in the paper uses the property that the ash (ash component) in the paper absorbs X-rays more strongly than the pulp. Ash content is measured by detecting the intensity of the attenuated X-rays using an ionization chamber.
- the retention control in the wire part 6 is performed by online measuring the total concentration of white water flowing down from the wire 15 to the white water silo 10 using the low concentration meter 24.
- the PI controller 26 provided in the control system 3 described later controls the opening of the control valve 21 by feedback control of short-period output so that the value matches the preset target value (or the fixed value). This is done by controlling the flow rate of the volume pump) and increasing or decreasing the flow rate of the yield improver added to the seed material.
- the yield improver is usually a high-viscosity liquid polymer (polymer) solution, but is added at a concentration of about 200 to 500 ppm to the seed material. Since the addition requires a very small flow rate control (depending on the production volume, approximately 1
- the pump 17a is a centrifugal pump if a control valve 21 is provided, and a variable flow rate metering if the control valve 21 is not provided.
- a pump or the like is used. By increasing or decreasing the rate of addition of such a small yield improver, it is possible to control the retention of raw material components (total concentration of white water) in the wire part 6.
- the ash content is controlled by adjusting the ash addition flow rate added to the pulp raw material so that the ash content in the paper conforms to the product specifications.
- the ash addition flow control unit 20 lowers the opening of the valve 18 based on the control signal from the BM meter control unit 25a.
- the ash flow rate sent by the pump 16a is reduced, and if the ash content rate decreases, the opening of the valve 18 is increased to increase the ash flow rate, thereby obtaining the target ash content.
- control system 3 for controlling the paper machine process 2 will be described.
- the control system 3 in this embodiment includes an input setting unit 28 for inputting various data and commands such as a target value of the required ash content and a target value of the total concentration of white 7K.
- a controller 29 that controls the ash addition flow rate control section 20 and the yield improver addition flow rate control section 23 according to the target values of the ash content rate and the total concentration of the white water set by the setting section 28, BM meter controller 25a.
- the controller 29 includes a computer having a CPU, a memory, and the like, and has a function as a PI controller 26 and a non-interference controller 30.
- the functions of the PI controller 26 and the non-interference controller 30 are realized by the CPU according to a program stored in the computer. This program can be stored in various storage media currently in use.
- the BM meter control unit 25a determines the target value of the ash content in the paper input by the input setting unit 28 and the ash content detected by the sensor head 25b of the BM meter.
- a control signal is sent to the ash addition flow rate control unit 20 based on the deviation from the content detection value, and the control signal is sent to the paper machine process 2 as shown in FIG.
- a feedback control loop hereinafter referred to as an ash control loop L1 for controlling the ash content is configured.
- the PI controller 26 is used to set the total concentration of the white water set in the input setting section 28.
- a control signal is sent to the yield improver-added flow control unit 23 based on the deviation between the target value and the concentration value obtained from the low concentration meter 24.
- a feedback control loop hereinafter referred to as a retention control loop L2 for retention control is configured.
- the ash control loop L 1 has been actually used in a conventional paper machine until now, but in recent years, the retention in a wire paper has also been increased. In order to stabilize, it is required to perform retention control with a short control cycle of about one second, and in order to respond to this, it is necessary to coexist with the ash content control loop L1 and the retention control loop L2. Have been.
- Gll, G12, G21, and G22 are expressed as Gab, and the size of operating the operation terminal a in the corresponding process is expressed as Xa.
- the response block when the magnitude of the appearing output terminal b changes is represented by Yba, where the magnitude of the gain (g ab) of the response block is expressed as follows if the output range of the controller is not taken into account:
- step A1 When the total concentration of white water in one part of the wire increases as a disturbance, the above-described retention control is performed, and the flow rate of the addition of the retention aid (polymer) is increased (step A1). Retention in the wire part increases (total concentration of white water in the part decreases), and the ash content in paper also increases (step A2). As a result, the ash content in the paper is controlled by the BM meter, and the ash addition flow rate is reduced to reduce the ash content in the paper (step A3). As a result, the ash concentration of the seed material ejected from the head box 4 decreases, so that the ash concentration of the white water decreases and the total concentration of the white water also decreases (step A4).
- Step A5 the retention control is activated, and the flow rate of the yield improver is reduced. Due to the mutual interference between the retention control and the ash content control in paper as described above, the yield Hunting occurs between the flow rate of the upper agent and the ash content in the paper (step A6).
- the ash content control in the paper of the BM meter controller 25a is activated, the ash flow rate is increased (step Bl), and the ash is ejected from the head box 4.
- the total concentration of white water increases (step B 2), and at the same time, the white ash concentration increases (step B 3).
- the retention control is activated to increase the flow rate of the retention aid, increasing the retention in the wire part 6 and increasing the ash content in the paper, as well as reducing the total concentration of white water and the white ash concentration. (Step B 4).
- step B5 the flow rate of the retention aid is reduced by the action of the retention control, and the ash content in the paper is reduced (step B5).
- hunting occurs in the addition flow rate of the yield improver and hunting also occurs in the ash content in the paper (step B6).
- a non-interference control unit 30 as shown in FIGS. Provided.
- the non-interference control unit 30 controls the signal obtained by multiplying the control output m 2 from the PI controller 26 by the non-interference block C 1 from the BM control unit 25 a
- the control output ml from the BM meter control unit 25a is multiplied by the non-interference block C2
- the result is added to the control output m2 output from the PI controller 26.
- the non-interfering blocks CI and C2 examine the response characteristics by setting the PI controller 26 to the manual operation mode when the paper machine process 2 is in a stable state and performing an operation of changing the output in a step-like manner.
- the non-interference block is calculated by the following calculation. Cl and C2 can be calculated as theoretical values.
- Equation 8 Equation 8
- Equation 7 ' the ash content yl in the paper is found to be affected only by the ash flow rate operation ml, and as is clear from Equation 8', the total concentration y2 of the white water is the yield It can be seen that the flow rate of the improver is affected only by m2. That is, both control loops can perform control independently of each other even under mutual interference by adding non-interfering elements.
- the values of the non-interference blocks C1 and C2 are determined while examining the operation response characteristics by changing the output of the operation end in a step-like manner.
- the gains of the blocks G11, G22, G12, and G21 may be used in the above formula.
- the non-interference control unit 30 that performs non-interference calculation control and the like based on the non-interference blocks C1, C2 and the like includes the ash control loop L1 and the retention control loop L1.
- the control loop By incorporating the control loop between the control loops L1 and L2, it is intended to positively cancel the adverse effects caused by mutual interference between the control loops L1 and L2.
- mutual interference generated between the two control loops Is considered as a kind of disturbance, and the signal obtained by multiplying the control signal of one control loop L2 by the interference coefficient is added or subtracted at the same time, so that one control loop gives the other control loop.
- the feed-forward control cancels out and removes the amount of brazing interference.
- each control can be kept independent, and the wet part can be set. It is possible to approach the target value retention (total concentration of white water) and the ash content in paper.
- FIGS. 3 to 5 show the total concentration of white water, the ash content in paper, and the yield when retention control and ash content control in paper were performed by the conventional control device and the control device according to the present embodiment, respectively.
- the state of fluctuation of the flow rate of the improver is shown.
- Figure 3 shows a state in which only ash content control is performed without performing retention control. As shown, the total concentration of white water fluctuates considerably.
- Fig. 4 shows a case in which the retention control loop L2 and the ash content control loop L1 in the paper are controlled as two independent control loops at the same time.
- the total concentration of white water and the ash content in the paper, which are the control end became very unstable due to mutual interference, and began to diverge.
- the ash variation in paper by controlling the ash content in paper by the BM meter was ⁇ 0.4 to 0.5% in the past (see Fig. 3).
- the improvement can be made to about ⁇ 0.2% (see FIG. 5).
- the retention control by the non-interference control unit it is possible to control so that the total concentration of white water, which is the final target, is always kept almost constant.
- further improvement in control performance can be expected by using dynamic characteristic compensation taking into account not only the response gain K but also a time delay such as dead time T1 and time constant T2 as a non-interference element.
- the response in this process can be approximated as a system with dead time and first-order lag as shown in Fig. 6.
- the non-interference blocks C 1 and C 2 for dynamic characteristic compensation can be determined. Can be.
- transfer functions often used in the field of automatic control for example, assuming that a symmetric process is approximated by a dead time + first-order lag system,
- S in the equation is the Laplace operator on the S plane (complex plane) when Laplace transform is performed on the relational expression between the input and output of the process response.
- the pulp concentration, the ash concentration, and the ash content in the paper should interfere with each other, so the control end is the pulp concentration and the ash concentration, and the control end is the pulp that increases or decreases the pulp flow rate. If the seed opening of the raw material, the opening of the ash addition valve, and the opening of the yield improver addition valve are controlled in a similar manner, and the non-interference factors for all combinations of these are controlled, pulp can be obtained. Both the concentration and the ash concentration can be maintained at the desired constant values, respectively.
- the present invention provides a paper machine that performs at least two types of automatic control, namely, retention control and ash content control, between a control loop for performing the retention control and a control loop for performing ash content control.
- retention control and ash content control are performed in a short control cycle, both controls can be performed stably, and the desired retention (total concentration of white water) is maintained.
- both controls can be performed stably, and the desired retention (total concentration of white water) is maintained.
- the present invention can be easily implemented as an inexpensive and simple structure in which a non-interference control unit is provided between the retention control and the ash content control in paper, so that the utility in the papermaking industry is extremely large. .
Landscapes
- Paper (AREA)
- Feedback Control In General (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2515981A CA2515981C (en) | 2003-02-13 | 2004-01-28 | Method and device for controlling paper machine, and program and storage medium |
FI20050807A FI20050807A (fi) | 2003-02-13 | 2005-08-09 | Paperikoneen ohjausmenetelmä, ohjauslaite ohjelma ja tallennusväline |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-035686 | 2003-02-13 | ||
JP2003035686A JP4063100B2 (ja) | 2003-02-13 | 2003-02-13 | 抄紙機の制御方法、制御装置、プログラム及び記憶媒体 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004072367A1 true WO2004072367A1 (ja) | 2004-08-26 |
Family
ID=32866303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/000753 WO2004072367A1 (ja) | 2003-02-13 | 2004-01-28 | 抄紙機の制御方法、制御装置、プログラム及び記憶媒体 |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP4063100B2 (ja) |
CN (1) | CN100558981C (ja) |
CA (1) | CA2515981C (ja) |
FI (1) | FI20050807A (ja) |
WO (1) | WO2004072367A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1530103A1 (de) * | 2003-11-06 | 2005-05-11 | Voith Paper Patent GmbH | Verfahren zur Herstellung einer Faserstoffbahn |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005002638A1 (de) * | 2005-01-20 | 2006-07-27 | Voith Paper Patent Gmbh | Aschebestimmung |
US20060162887A1 (en) * | 2005-01-26 | 2006-07-27 | Weinstein David I | System and method to control press section dewatering on paper and pulp drying machines using chemical dewatering agents |
JP2007011866A (ja) * | 2005-07-01 | 2007-01-18 | Yokogawa Electric Corp | プロセス制御装置における非干渉制御方法、およびプロセス制御装置 |
JP4779762B2 (ja) * | 2006-03-30 | 2011-09-28 | 栗田工業株式会社 | 製紙用薬剤の効果監視方法及び注入量制御方法 |
JP2008025087A (ja) * | 2006-06-21 | 2008-02-07 | Nippon Paper Industries Co Ltd | 製紙原料の試料濃度測定方法及び測定装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02160992A (ja) * | 1988-12-12 | 1990-06-20 | Toshiba Corp | 抄紙プラントの坪量制御装置 |
JPH03161589A (ja) * | 1989-11-18 | 1991-07-11 | Yokogawa Electric Corp | プロフィールの非干渉制御装置 |
EP0651092A1 (en) * | 1993-10-29 | 1995-05-03 | Valmet Paper Machinery Inc. | Stock feed system for a multi-layer headbox and method in the operation of a multi-layer headbox |
JPH10325092A (ja) * | 1997-05-23 | 1998-12-08 | Oji Paper Co Ltd | 抄紙機のワイヤパートの濾過白水濃度の自動制御方法とその装置ならびに濾過白水の目標濃度の設定方法 |
-
2003
- 2003-02-13 JP JP2003035686A patent/JP4063100B2/ja not_active Expired - Fee Related
-
2004
- 2004-01-28 WO PCT/JP2004/000753 patent/WO2004072367A1/ja active Application Filing
- 2004-01-28 CN CNB2004800042827A patent/CN100558981C/zh not_active Expired - Fee Related
- 2004-01-28 CA CA2515981A patent/CA2515981C/en not_active Expired - Fee Related
-
2005
- 2005-08-09 FI FI20050807A patent/FI20050807A/fi not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02160992A (ja) * | 1988-12-12 | 1990-06-20 | Toshiba Corp | 抄紙プラントの坪量制御装置 |
JPH03161589A (ja) * | 1989-11-18 | 1991-07-11 | Yokogawa Electric Corp | プロフィールの非干渉制御装置 |
EP0651092A1 (en) * | 1993-10-29 | 1995-05-03 | Valmet Paper Machinery Inc. | Stock feed system for a multi-layer headbox and method in the operation of a multi-layer headbox |
JPH10325092A (ja) * | 1997-05-23 | 1998-12-08 | Oji Paper Co Ltd | 抄紙機のワイヤパートの濾過白水濃度の自動制御方法とその装置ならびに濾過白水の目標濃度の設定方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1530103A1 (de) * | 2003-11-06 | 2005-05-11 | Voith Paper Patent GmbH | Verfahren zur Herstellung einer Faserstoffbahn |
US7435314B2 (en) | 2003-11-06 | 2008-10-14 | Voith Paper Patent Gmbh | Method for the production of a fibrous web |
Also Published As
Publication number | Publication date |
---|---|
CN1751155A (zh) | 2006-03-22 |
FI20050807A (fi) | 2005-09-14 |
JP2004263309A (ja) | 2004-09-24 |
CA2515981A1 (en) | 2004-08-26 |
CN100558981C (zh) | 2009-11-11 |
CA2515981C (en) | 2010-06-22 |
JP4063100B2 (ja) | 2008-03-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2595813C (en) | System and method to control press section dewatering on paper and pulp drying machines using chemical dewatering agents | |
US7496413B2 (en) | Apparatus and method for coordinating controllers to control a paper machine or other machine | |
CA2167292C (en) | System for overall control of the different transverse profiles in a paper web manufactured by means of a machine for the manufacture of a web material, such as a board or paper machine and/or a finishing machine | |
US4374703A (en) | Control system for papermaking machine headbox | |
US20030089479A1 (en) | Device for controlling or regulating the basis weight of a paper or cardboard web | |
US8728276B2 (en) | Apparatus and method for controlling curling potential of paper, paperboard, or other product during manufacture | |
US9309625B2 (en) | Concept to separate wet end and dry end paper machine control through estimation of physical properties at the wire | |
WO2004072367A1 (ja) | 抄紙機の制御方法、制御装置、プログラム及び記憶媒体 | |
US20070158044A1 (en) | Method and plant for producing a fibrous web | |
US9096973B2 (en) | Method for regulating the formation of a fibrous web | |
US6904331B2 (en) | Method of paper machine control and apparatus for the method | |
JP2007011866A (ja) | プロセス制御装置における非干渉制御方法、およびプロセス制御装置 | |
Tessier et al. | Motor load and freeness control of CMP pulp refining | |
JPH0813376A (ja) | 抄紙機の紙厚制御装置 | |
Mori et al. | Retention control system for the wet-end section in a paper machine | |
Sunda et al. | Continuous online fibre analysis enables improved pulp quality estimation and control | |
WO1994017238A1 (en) | Ozone reactor process control | |
JPH0411089A (ja) | 抄紙機の抄速変更・抄替制御装置及びその方法 | |
Myllyneva et al. | Fuzzy Quality Control of a TMP Plant | |
JPH0813375A (ja) | 抄紙機の水分率制御装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DPEN | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed from 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 20050807 Country of ref document: FI |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2515981 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20048042827 Country of ref document: CN |
|
122 | Ep: pct application non-entry in european phase |