EP2145693A1 - Surveillance d'un flux de milieu d'application lors de l'application sur une bande de papier, de carton ou autre matière fibreuse - Google Patents

Surveillance d'un flux de milieu d'application lors de l'application sur une bande de papier, de carton ou autre matière fibreuse Download PDF

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Publication number
EP2145693A1
EP2145693A1 EP08160502A EP08160502A EP2145693A1 EP 2145693 A1 EP2145693 A1 EP 2145693A1 EP 08160502 A EP08160502 A EP 08160502A EP 08160502 A EP08160502 A EP 08160502A EP 2145693 A1 EP2145693 A1 EP 2145693A1
Authority
EP
European Patent Office
Prior art keywords
application
monitoring
fibrous web
parameter deviation
medium flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08160502A
Other languages
German (de)
English (en)
Inventor
Bernd-Uwe Stellner
Werner Buttschardt
Manfred Ueberschär
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to EP08160502A priority Critical patent/EP2145693A1/fr
Publication of EP2145693A1 publication Critical patent/EP2145693A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1007—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters

Definitions

  • the invention relates to a method for monitoring a coating medium flow of an application device when applied to a paper, cardboard or other fibrous web, in detail with the features of the preamble of claim 1.
  • the invention further relates to a device for monitoring according to the preamble of claim 17.
  • the application medium in particular pigment-containing coating color, results from a color supply system upstream of the application unit.
  • the coating color is usually supplied to the commissioned work after mixing, filtering and venting.
  • the order is often done either in the form of a free falling onto the web job media curtain with a curtain applicator or Curtain Coater or in the form of a pressurized media jet with a free-jet nozzle device.
  • the latter device represents a predosing system, which is followed by a metering or equalizing device with a so-called doctoring element.
  • the application medium is applied substantially following the principle of gravity.
  • the web to be coated moves below at least one (in the case of multiple application) curtain nozzle of the application device, wherein the application device is located at a predefined distance from the moving surface of the fibrous web. This Distance has overcome over the machine width formed curtain or the beam of the free-jet nozzle device.
  • the amount of coating applied is deposited as a contour line on the surface of the web.
  • This job type requires the job media curtain to be even and closed across the machine width. In some cases, however, an undesirable tearing of the application media curtain is observed. The tearing is essentially due to impurities in the feed path in the application media supply system, in particular in the region of the nozzle. Once contaminated, the impurities can not pass through the nozzle outlet itself. In this case, the residual curtain produced at this point no longer closes automatically, as a result of which the fibrous web passing underneath is not coated in the area of the crack.
  • the impurities can be removed by a brief manual intervention in the nozzle, which can also be done during operation, but much more critical than the resulting defects on the web are the accumulations of the coating medium right next to the defects. These clumps dry considerably worse than the rest of the contour stroke, which negatively affects the subsequent processing steps. Thus, remnants of these clusters can attach and build up on the machine elements, such as the web-carrying rollers, resulting in further "line defects" on the web. This requires a shutdown of the machine and time-consuming cleaning of the individual areas, which in turn is expensive and means significant production loss. Particularly problematic is the situation when the applicator is followed by a calender, that is, the coated fibrous web after passing through the commissioned work still passes through a calender.
  • JP 2002-273309 proposed the use of a detection system for such defects on the free-falling curtain of application medium during the coating process.
  • the application medium is optically detected and the images generated are evaluated for the presence of local irregularities out.
  • this coated part of the fibrous web is marked in the free curtain as a function of the detection of the occurrence of said irregularities in the application medium and removed in a subsequent process step.
  • the method described in this document requires the arrangement of the detection devices in the immediate vicinity of the order media process, which are exposed to contamination. This can lead to misinterpretations.
  • the invention is therefore an object of the invention to provide a method and an apparatus which are able to make possible possible line defects as quickly and safely recognizable and, if desired, appropriate measures to eliminate such defects, in particular to initiate negative impact.
  • the application medium When operating an application device for applying a coating medium on a moving fibrous web, in particular a paper, cardboard or other fibrous web, the application medium is monitored after exiting the applicator device across the machine width and according to the invention when a local irregularity, in particular Contamination or defect of application medium, an action device activated.
  • the monitoring takes place via a monitoring area. This extends transversely to the fibrous web running direction over a predefined minimum width, preferably the machine width, in particular width of the application device. However, the monitoring is preferably carried out over the entire width of the fibrous web or the entire coating area.
  • the application medium flow is monitored directly between the dispenser and the impingement on the fibrous web.
  • a particularly advantageous application is a so-called curtain applicator, here the homogeneity, especially with regard to the closedness of the curtain over the entire machine width is monitored. Defects, which lead to errors in the coating, are thus already detectable before the order.
  • the monitoring can be acoustic or capacitive.
  • acoustic waves in the monitoring area are introduced into the order media stream in the former case and received at another location on a receiving device, defining a basic signal, wherein a presence of a locally occurring parameter deviation is detected upon change of the basic signal.
  • the introduction of the acoustic waves preferably takes place transversely to the direction of movement of the fibrous web in the application device at a lateral end region of the application medium flow in the direction of the opposite end region over the width of the application medium flow.
  • the required elements of the detection device are arranged outside the working area of the application device and the moving fibrous web on both sides of the applicator laterally next to the moving fibrous web, so that impurities are largely avoided at the detection device.
  • capacitors are assigned to the application medium flow over the minimum width of the fibrous web, and a local parameter deviation is derived from a change in the permeability number. Even with this method, impurities can be detected in addition to defects.
  • Electromagnetic methods used are based on the reflectivity and absorption or transmittance of the coating media stream.
  • appropriate radiation or light sources are used, which are directed to one or both sides of the free-falling curtain (or medium beam in example used Freistrahldüsen Kunststoffswerken).
  • light rays optical or visible rays
  • non-visible rays such as microwaves, infrared rays, gamma rays, etc.
  • intensity measuring devices it is possible on the opposite side to detect the proportion of radiation passed through defects, in particular in the freely falling curtain. It is usually sufficient to detect only the presence of defects, since a cleaning of the application device is usually done over the entire machine width. Another possibility is the detection of deviations in the reflectivity over the entire machine width.
  • the order media flow is monitored after impacting the fibrous web to be coated.
  • an action unit is also actuated here.
  • the error in the coating medium caused by the error in the coating is determined and closed on this error or contamination in the applicator.
  • the detection device is here, even when arranged on the machine width, not so heavily contaminated, as in the direct arrangement on both sides or immediately before or after the order media flow according to the first embodiment.
  • the arrangement of at least the sensors of the detection devices takes place either over the machine width or preferably to shorten the design and reduce the faulty Evaluations triggering impurities laterally to the fibrous web.
  • the arrangement is spaced from the order media flow or the coating, so that contact is detected.
  • the cleaning can be manually initiated as mentioned or else operated automatically, the cleaning with purely mechanical means (such as a scraper) is carried out with good accessibility of the applicator.
  • a hydraulic method for example, a suitable flushing method is used, wherein the purge with pure water as well a fluid can be made with chemical additives.
  • Other possibilities are the knocking off of the fibrous web with a very strong expression of the imperfections in the coating with thickening in the marginal areas of the defects.
  • the device used to implement the monitoring tasks is described in claim 17.
  • the function of the device has already been explained in the description of the method, which is why no repetition should take place here.
  • the device according to the invention extends either parallel to the application device across the width, wherein the arrangement can take place on only one side or on both sides of the free-falling curtain or the medium beam from application medium, or laterally next to the fibrous web.
  • the detection process is carried out transversely to the fibrous web running direction. This offers next to a lower susceptibility to contamination and the advantage of better accessibility.
  • the device according to the invention is assigned to the application medium flow after striking the fibrous web to be coated.
  • the device for detecting a parameter deviation comprises, in the simplest case, a sensor depending on the type of monitoring method. It can also be a transmitting device and a receiving device for electromagnetic monitoring, for example by means of camera, wherein a software with the camera data makes a gray value analysis.
  • the result can be saved and / or displayed on a monitor. This monitoring result can then be taken as a trigger for example, a railway tee.
  • a sensor bar with light grid, or an acoustic (sound waves) or a capacitive (by means of capacitors) monitoring is also possible.
  • the solution according to the invention is particularly suitable for the application of application medium, for example in the form of coating color in an application device in the form of a Can be used curtain applicator.
  • application medium for example in the form of coating color in an application device in the form of a Can be used curtain applicator.
  • FIG. 1 schematically illustrates a greatly simplified representation of an applicator 1.
  • the curtain applicator 2 is in terms of its basic structure and the basic version, for example, from DE 197 16 647 A1 previously known.
  • the application device shown here receives its order media stream 7 from a commissioned with the application unit 2schreibmedienkousaku 9.
  • the application medium is then applied from top to bottom and essentially following the principle of gravity on a running relative to a nozzle outlet 10, or moving fibrous web 3.
  • the web 3 may be any type of webs, but preferably such coating systems are used to coat paper or board webs.
  • the commissioned unit 2 is arranged for this purpose at a predefined distance a to the running surface 4 of the fibrous web 3, so that a curtain 5 from a nozzle 6, which extends continuously and over the entire width b2 of the usually machine-wide commissioned work 2, free and unsupported down can fall down to the surface 4 to be coated or impregnated and there in the amount which is supplied to the surface 4, as a contour line on the surface 4 of the here indicated by arrow direction of the moving fibrous web 3.
  • Prerequisite for a on the web width b3 of Fibrous web 3 uniform and homogeneous application free of defects is the uniformity and homogeneity of the curtain 5 over the machine width or at least over the width to be coated or the total width b3 of the fibrous web.
  • FIG. 1 illustrates greatly exaggerated the tearing of the curtain 5 and the resulting defect line 12, that is, the part of the fibrous web surface 4, which is not covered by application medium.
  • an application media monitoring system 14 which observes the order media stream 7 after exit 10 at the nozzle 6, in particular the homogeneity in thickness and distribution, ie uniformity across the machine width and the occurrence of defects 11, in particular an irregularity initiates measures to eliminate these in the order medium.
  • the application media monitoring system 14 is shown schematically here and for this purpose comprises at least one detection device 15. It is therefore possible to detect at least one deviation of a parameter x which characterizes a property of the application medium flow 7 over the width b7 of the application medium flow 7.
  • the monitored width of the order media stream 7 is at least the required width b7 'to achieve the required minimum coating width b3' of the fibrous web 3, which preferably corresponds to the total width b3, but may also be smaller, taking into account subsequent Randabtrenn 11,.
  • the parameters to be detected thereby characterize at least defects 11, preferably also other irregularities, such as impurities in the application medium flow 7.
  • the detection device 15 acts with a device 16 for processing the with the Detection device 15 detected signal together, wherein on the processing means 16 at least one manipulated variable Y for an action unit 17, comprising at least one action means is generated.
  • the signal processing device 16 for processing the parameter deviation may be designed as a simple converter which outputs such a signal, which characterizes the occurrence of an irregularity over the machine width in the application medium stream 7, in a corresponding error signal Fs, which is output as an error message is converted.
  • the output is preferably acoustic, or optical or capacitive. Combinations are also conceivable.
  • the coating process can be interrupted at least for a short time. It is also possible to knock off the fibrous web 3, ie the defective coated part is passed into a waste facility.
  • Other possibilities are the formation of at least one manipulated variable Y for controlling the action unit 17, for example, for putting a cleaning device 18 into operation FIG. 1 but only symbolically indicated.
  • FIG. 2 illustrated by an embodiment according to FIG. 1 a further second embodiment of the monitoring according to the invention by detecting parameter deviations of the application medium after hitting the fibrous web 3.
  • the structure of the application medium monitoring system 14 corresponds to the in FIG. 1 Therefore, the same reference numerals are used for the same elements. Only the detection device 15 is no longer associated with the freely falling curtain 5 but the fibrous web 3 following the coating process.
  • FIGS. 3 to 5 illustrate greatly simplified possible embodiments of the detection devices 15 and also their arrangement options.
  • an arrangement will generally take place after the exit 10 from the nozzle, wherein the arrangement or monitoring of the application medium can take place prior to hitting the fibrous web 3 to be coated or else the recognition Of errors also only after the impact, that is directly on the surface 4 of the fibrous web as in the FIGS. 1 and 2 clarified.
  • the application medium in particular the curtain 5 is monitored
  • the surface 4 of the fibrous web 3 is monitored, preferably scanned.
  • the parameter deviation is detected from a transmission variable
  • the parameter deviation is derived from the reflectivity of the application medium flow 7.
  • an optical source in particular light source 25
  • a receiver 26 On the opposite side of a receiver 26 is arranged, which at least the light passing through the flaws 11, depending on the order media condition that this penetrating light receives and can locate defects based on the differences across the machine width or detect defects.
  • optical source 25 and receiver 26 are disposed on the same side of the curtain 5, a parameter deviation is derived from the different reflectivity of the application media stream 7 across the machine width.
  • a perspective view according to FIG. 4 is a corresponding light source and receiving unit arranged machine width.
  • a device 15 for capacitive monitoring is shown. This is characterized by the arrangement of one, preferably a plurality of capacitors 27 across the machine width, wherein the Error detection as a result of the change in the permeability number occurs when defects in the order media stream 7 occurs.
  • FIG. 7 illustrates a schematic simplified representation of a possibility of acoustic monitoring.
  • a means 28 for introducing a sound signal for example on the drive side TS in the curtain 5 is provided as a transmitter 29, while a receiver 30 is disposed opposite to the leader side FS or vice versa and receives the signal.
  • Parameter deviations produce a deviation from a base signal otherwise set at the receiver 30.
  • the detection device 15 in particular the sensor system is installed within the machine width or over the entire machine width b2. According to a further development, it is also conceivable to arrange the sensors outside the application device 1, this applies in particular to the detection devices 15 in order to avoid fouling.
  • the detection devices, in particular transmitter and receiver can also be arranged in their assignment to each other transversely to the fibrous web running direction.
  • FIG. 8 illustrates a method for optical detection of parameter deviations according to the second embodiment of the inventive solution, as in FIG. 2 clarified.
  • a camera 31 is used as detection device 15, which optically scans and detects the entire surveillance area, which extends over the machine width, in particular the width of the coated fibrous web 3.
  • the camera 31 is arranged at a distance from the surface 4 of the coated fibrous web 3. Images are continuously created, which are processed and evaluated in the already described signal processing device 16 for processing, so that the necessary measures can be taken according to the result.

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EP08160502A 2008-07-16 2008-07-16 Surveillance d'un flux de milieu d'application lors de l'application sur une bande de papier, de carton ou autre matière fibreuse Withdrawn EP2145693A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08160502A EP2145693A1 (fr) 2008-07-16 2008-07-16 Surveillance d'un flux de milieu d'application lors de l'application sur une bande de papier, de carton ou autre matière fibreuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08160502A EP2145693A1 (fr) 2008-07-16 2008-07-16 Surveillance d'un flux de milieu d'application lors de l'application sur une bande de papier, de carton ou autre matière fibreuse

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EP2145693A1 true EP2145693A1 (fr) 2010-01-20

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012010511A1 (fr) * 2010-07-20 2012-01-26 Voith Patent Gmbh Coucheuse rideau
CN113503686A (zh) * 2021-06-15 2021-10-15 中国煤炭科工集团太原研究院有限公司 一种风冷系统用滑移式自动清灰装置
CN117904857A (zh) * 2024-01-16 2024-04-19 浙江越剑智能装备股份有限公司 一种智能验布机的宽幅检测装置及其计算方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1800153A1 (de) * 1968-10-01 1970-04-23 Guenter Reinemann Einrichtung zur Kontrolle des Fliessvorhanges bei Fluessigkeitsgiessmaschinen
US5190789A (en) * 1991-08-29 1993-03-02 Eastman Kodak Company Ultrasonic monitoring of a freely flowing curtain of coating material
JPH09173935A (ja) * 1995-12-25 1997-07-08 Matsushita Electric Works Ltd フローコート塗装状態の検出方法およびその装置
DE19716647A1 (de) 1997-04-21 1998-10-22 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zum Auftragen einer Pigmentstreichfarbe auf eine Papier- oder Kartonbahn
DE19814491A1 (de) 1998-04-01 1999-10-07 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zur Vermeidung oder Beseitigung von Verstopfungen im Dosierspalt eines Düsenauftragswerks
DE19814490A1 (de) 1998-04-01 1999-10-07 Voith Sulzer Papiertech Patent Verfahren zur Vermeidung oder Beseitigung von Verstopfungen der Austrittsöffnung des Dosierspaltes eines Düsenauftragwerkes
FR2796462A1 (fr) * 1999-07-15 2001-01-19 Eastman Kodak Co Procede et dispositif de detection d'un defaut dans une nappe liquide
JP2002273309A (ja) 2001-03-15 2002-09-24 Ishikawajima Harima Heavy Ind Co Ltd カーテンコータにおける塗工液中の欠陥検出装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1800153A1 (de) * 1968-10-01 1970-04-23 Guenter Reinemann Einrichtung zur Kontrolle des Fliessvorhanges bei Fluessigkeitsgiessmaschinen
US5190789A (en) * 1991-08-29 1993-03-02 Eastman Kodak Company Ultrasonic monitoring of a freely flowing curtain of coating material
JPH09173935A (ja) * 1995-12-25 1997-07-08 Matsushita Electric Works Ltd フローコート塗装状態の検出方法およびその装置
DE19716647A1 (de) 1997-04-21 1998-10-22 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zum Auftragen einer Pigmentstreichfarbe auf eine Papier- oder Kartonbahn
DE19814491A1 (de) 1998-04-01 1999-10-07 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zur Vermeidung oder Beseitigung von Verstopfungen im Dosierspalt eines Düsenauftragswerks
DE19814490A1 (de) 1998-04-01 1999-10-07 Voith Sulzer Papiertech Patent Verfahren zur Vermeidung oder Beseitigung von Verstopfungen der Austrittsöffnung des Dosierspaltes eines Düsenauftragwerkes
FR2796462A1 (fr) * 1999-07-15 2001-01-19 Eastman Kodak Co Procede et dispositif de detection d'un defaut dans une nappe liquide
JP2002273309A (ja) 2001-03-15 2002-09-24 Ishikawajima Harima Heavy Ind Co Ltd カーテンコータにおける塗工液中の欠陥検出装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012010511A1 (fr) * 2010-07-20 2012-01-26 Voith Patent Gmbh Coucheuse rideau
CN113503686A (zh) * 2021-06-15 2021-10-15 中国煤炭科工集团太原研究院有限公司 一种风冷系统用滑移式自动清灰装置
CN113503686B (zh) * 2021-06-15 2022-12-27 中国煤炭科工集团太原研究院有限公司 一种风冷系统用滑移式自动清灰装置
CN117904857A (zh) * 2024-01-16 2024-04-19 浙江越剑智能装备股份有限公司 一种智能验布机的宽幅检测装置及其计算方法

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