WO2008034954A2 - Procédé et dispositif de mesure des propriétés d'une toile en mouvement - Google Patents

Procédé et dispositif de mesure des propriétés d'une toile en mouvement Download PDF

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Publication number
WO2008034954A2
WO2008034954A2 PCT/FI2007/050503 FI2007050503W WO2008034954A2 WO 2008034954 A2 WO2008034954 A2 WO 2008034954A2 FI 2007050503 W FI2007050503 W FI 2007050503W WO 2008034954 A2 WO2008034954 A2 WO 2008034954A2
Authority
WO
WIPO (PCT)
Prior art keywords
web
camera
light source
illumination
illuminated
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.)
Ceased
Application number
PCT/FI2007/050503
Other languages
English (en)
Other versions
WO2008034954A3 (fr
Inventor
Tuulikki Manninen
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of WO2008034954A2 publication Critical patent/WO2008034954A2/fr
Publication of WO2008034954A3 publication Critical patent/WO2008034954A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/86—Investigating moving sheets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8901—Optical details; Scanning details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/86—Investigating moving sheets
    • G01N2021/8663—Paper, e.g. gloss, moisture content
    • G01N2021/8681—Paper fibre orientation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
    • G01N2021/8917—Paper, also ondulated
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/061—Sources
    • G01N2201/06113—Coherent sources; lasers
    • G01N2201/0612—Laser diodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/061—Sources
    • G01N2201/06126—Large diffuse sources
    • G01N2201/06133—Light tables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/069—Supply of sources
    • G01N2201/0696—Pulsed
    • G01N2201/0697—Pulsed lasers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/08—Optical fibres; light guides
    • G01N2201/084—Fibres for remote transmission

Definitions

  • the invention relates to a method for the measurement of properties of a moving web according to the preamble of the appended claim 1.
  • the invention also relates to a device for implementing the aforementioned method in accordance with the preamble of the appended claim 12.
  • the manufacturing process is continuously monitored by means of various measurements. These are used to secure that the process operates in the desired way and that the quality of the web meets the target values. Measurements are taken from the process devices, from the pulp used for manufacturing the web, as well as from the finished web.
  • the measurement target is illuminated with light and detected with a camera.
  • the camera produces image material that is analyzed with a data processor.
  • the method of illumination and the illumination wavelength as well as the type of the camera used as the detector are selected according to the property to be measured.
  • the illumination may be continuous or pulsed illumination.
  • the camera may be, for example, a line camera, a matrix camera, a CCD camera, a CMOS camera, or a video camera.
  • Patent publication DE 19930154 discloses a device for measuring the formation and the formation index of a moving paper web, wherein the paper web is illuminated from one side of the web with light emitted by a LED array. The illumination is pulsed. At the corresponding location on the opposite side of the web, at least one matrix camera is arranged to form images of the web and to lead the image information into a data processor for processing.
  • Document US 5,113,454 discloses another system for measuring the formation of a moving paper web, wherein the illumination from one side of the web is implemented as continuous diffuse illumination. At the corresponding location on the other side of the web, a CCD camera is provided to produce image information to be led into a data processor.
  • the above-mentioned methods and devices for measuring the formation involve the problem of not being capable of measuring the formation of thick paper and cardboard webs. This is due to their poor illumination. Normal LED technology or continuous diffuse illumination is not sufficiently effective to penetrate the web and for the image information recorded by the camera to be sufficiently clear for determining the formation. This problem is particularly difficult in the measurement of the formation of thick webs, such as cardboard and cellulose webs with great web thicknesses, the grammage ranging from 600 to 1200 g/m 2 . At present, the formation of cellulose webs is thus not measured on-line at all.
  • the formation can also be measured in a laboratory, where samples taken from the web are measured by methods utilizing e.g. a camera.
  • the paper samples taken from the web only represent very small areas of the whole manufactured web, not the formation of the whole web.
  • Defects occurring in the moving fiber web such as holes, tears and markings caused by different parts of the web manufacturing machine, such as wires and felts, have also been monitored and measured with devices comprising a camera as the detector.
  • Such methods are presented, for example, in WO publications 99/10833 and 2004/063664.
  • a problem in these methods is that in the absence of effective illumination, the quality of the image material recorded by the camera is poor. For this reason, it is difficult to analyze the defects from the image material.
  • the method according to the invention is primarily characterized in what will be presented in the characterizing part of the independent claim 1.
  • the device according to the invention is primarily characterized in what will be presented in the characterizing part of the independent claim 12.
  • the invention is based on the idea that a moving fiber web is measured with a measuring device, in which the illumination of the web is implemented with a diode laser light source.
  • the diode laser is capable of emitting very exact short light pulses with a high pulse power.
  • the illumination has good spatial resolution and it can be used for the measurement of thick material layers.
  • the resolution of cameras that are commercially available today is sufficiently good for stopping the movement of the target and for capturing images at a high frequency.
  • the diode laser light source may consist of one or more diode lasers.
  • a light source composed of several diode lasers it is possible to combine their light power and to direct the light to the target in a desired way, for example by means of an optical fiber.
  • Such sophisticated diode laser light sources are capable of producing even 100-fold brightnesses compared with currently available advanced LED light sources. This is due to the fact that the pulse power of the diode laser light sources may range from about 500 W to 1 kW.
  • the length of the light pulse can also be adjusted, and it may vary from 1.5 to 10 ⁇ s.
  • the wavelength of the light emitted by the diode laser light source can also be adjusted; depending on the application, it may be either 680 nm or 808 nm.
  • the effective light source is crucially important for visualizing a moving target.
  • the camera applied in the device for detection may be any camera suitable for measurement purposes. It is possible to use, for example, a camera equipped with an external shutter release that is capable of capturing still or multiple exposure images. Such cameras are inexpensive and they still have a good resolution to secure sharp image quality, for analyzing desired process features or properties of the web.
  • An imaging device applying a pulsed diode laser light source and a still camera is capable of imaging a web running at a speed as high as 150 to 2000 m/min. It is possible to capture, for example, 200 images per a measurement point. Thanks to the high-power illumination provided by the diode laser light source, the image material obtained in detecting has a significantly better quality than material obtained with devices of prior art.
  • the light pulse emitted by the diode laser light source is so intense that the device can also be used for measuring a web on a supporting means, such as a wire or felt.
  • the light source is placed on one side of the supporting means to illuminate the web through the supporting means, and the camera is arranged to detect, that is to form images of the web from its other side.
  • the formation of the moving fiber web can be measured so that the running web is supported by the supporting means. Thanks to the intensity of the light pulse, it is possible to measure the properties of not only thin paper grades but also the thickest cellulose webs. It has been shown by experiments that the device can be used for measuring, for example, the formation of webs with a grammage of about 150 to 1100 g/m 2 .
  • the supporting member is visible in the captured images of the web. In the measurement of certain properties, such as formation, it does not disturb the measurement of the property itself. If necessary, the effect of the wire on the measurement can be eliminated by image processing methods.
  • the device can be used for on-line monitoring of the manufacturing process of paper, cardboard and cellulose webs. Analyzes on the operation of the process and its parts can be made quickly from the accurate image material obtained from the monitoring. Furthermore, the device can be arranged to measure the properties of a moving paper, cardboard or cellulose web continuously on-line. Thanks to the accuracy of the image material obtained from the device, the results are accurate and reliable. When defects occurring in the web are monitored by the device, even the smallest defects are visualized quickly and the web manufacturing process can be readjusted to reduce them.
  • the device also makes it possible to measure certain properties, such as formation, of thick fiber webs, which cannot be measured with the measurement devices of prior art at all.
  • the web can be measured closer to the web forming part than before.
  • the structure of the web no longer needs to be strong enough to withstand a so-called free transfer, where the web runs without the supporting means and where the measurements are conventionally made.
  • Fig. 1 shows a schematical principle view of the device according to the invention, seen from the side
  • Fig. 2 shows a schematical side view of a device according to the invention
  • Fig. 3 shows a schematical side view of a second device according to the invention.
  • Fig. 4 shows a supporting surface from above.
  • Figure 1 shows a principle view of a device for measuring a web.
  • a machine for manufacturing a fiber web such as a paper, cardboard or cellulose web manufacturing machine, which machine is not shown in the figure for clarity
  • the web W to be manufactured moves forward in the direction of an arrow A.
  • a light source 1 is arranged to illuminate the web W from the side of its second surface S2.
  • a detector is provided, that is, a camera 2 arranged to form images of the web from the side of its first surface S1 substantially in the location exposed to illumination.
  • the camera and the light source are thus on opposite sides of the web W.
  • the image material produced by the camera 2 is led via a line 3 to data processing equipment 4.
  • the data processing equipment 4 comprises software and algorithms, by means of which the image material can be processed.
  • the data processing equipment also comprises means for receiving and storing the image material.
  • the camera 2 can also be controlled by the data processing equipment 4, for which purpose the data processing equipment comprises means for transmitting control commands to the camera.
  • the light source 1 can also be controlled by the data processing equipment 4.
  • the data processing equipment 4 and the light source 1 are connected to each other via a line 8.
  • the data processing equipment 4 is connected to a user interface 5 comprising a display device 6 and one or more input devices 7.
  • the display device 6 may be a display based on a cathode tube, a flat panel display, or an image projected onto a substrate.
  • the display device 6 may be a conventional keyboard, a mouse, or another data input device known in the field.
  • the operator may visually observe, that is, look at the image material produced by the camera, and by means of the input device 7, it is possible to control the camera 2 and the light source 1.
  • the light source 1 is a diode laser light source emitting light pulses with a high pulse power.
  • the illumination emitted by the diode laser can penetrate the web W and makes it possible to see, for example, structural elements forming the web, such as fibers, in the image material produced by the camera 2. This measurement configuration is thus suitable for measuring, for example, the formation of the web or the fiber orientation.
  • the diode laser source consists of at least one diode laser. When several diode lasers are used, their illumination is focused in such a way that their light power is combined. As a result, only one, very intense light beam is directed to the web. The area illuminated by the light beam may vary from a very small spot of light to a large illuminated area.
  • Figure 1 also shows another measurement configuration, in which the light source V is placed on the same side of the web W as the camera 2.
  • the light source 1 ' is a diode laser light source.
  • the light source V illuminates the web W from the side of its first surface S1 at a given angle, and the camera 2 is arranged to detect, that is to form images, from the same side as the illumination, substantially the location of the web which is exposed to the illumination.
  • the image material produced by the camera 2 is led via a line 3 to data processing equipment 4.
  • the light source V can also be controlled by means of the data processing equipment 4.
  • the data processing equipment 4 and the light source V are connected to each other via a line 9.
  • This measurement configuration is suitable for the monitoring of a moving web, for example for detecting defects in the web, such as holes or marking caused by machine parts in contact with the web.
  • Figure 2 shows an embodiment for measuring web properties.
  • the web W moves in the direction of the arrow A in the web manufacturing machine.
  • an illumination platform 10 is arranged and provided with a window 11.
  • the window 1 1 is placed in vicinity to the second surface S2 of the web W.
  • the window 11 is embedded in the illumination platform 10 on the web side so that the surfaces of the window 11 and the illumination platform 10 that face the web are substantially on the same level and form a uniform flat surface that does not prevent the travel of the web.
  • the illumination platform 10 may be in contact with the web W to be measured, or there may be a small air gap between the illumination platform 10 and the web W.
  • Figure 4 shows the illumination platform 10 seen from above.
  • the window 11 is fixed substantially in the center of the illumination platform 10 so that it is surrounded on all sides by the edges of the illumination platform. The suitable shape and size of the window 11 are selected according to the measurement target.
  • the window is square.
  • the sides of the square may have a length ranging from about 60 to 120 mm and being preferably about 70 mm.
  • the window 11 may also have another shape, for example, annular, rectangular or polygonal.
  • the illumination platform 10 is equipped with means for distributing light evenly over the window 1 1.
  • the means may comprise mirrors, grates, optical fibers or other elements distributing light evenly over the window 11.
  • the illumination platform 10 is connected to the light source 1 via a light guide 12.
  • the light guide 12 is a single optical fiber or a fiber bundle consisting of several optical fibers. It is also possible to use other guides suitable for the transmission of light.
  • the light source 1 is a diode laser light source.
  • the light guide 12 transmits the light emitted by the light source 1 into the illumination platform 10, and the web W is illuminated through the window 11.
  • the light guide 12 it is possible to transmit the illumination into targets that are placed in locations that are difficult to reach in web manufacturing apparatuses.
  • a camera 2 is placed in the location corresponding to the illumination plane, on the side of the first surface S1 of the web W, and is arranged to detect substantially that area of the web which is exposed to the illumination.
  • Figure 3 shows a second embodiment for measuring web properties.
  • the web W is supported by a supporting means 13 moving substantially at the same rate and in the same direction as the web W.
  • the running direction of the web W and the supporting means 13 is indicated with an arrow A in the figure.
  • the supporting means 13 is a band-like endless belt loop, such as felt or wire, supported by guide rolls and running in the web manufacturing machine. It may also be a band-like loop of a supporting means installed in the machine entirely for the measurement.
  • the second surface S2 of the web W is in contact with the first surface SS1 of the supporting means.
  • an illumination platform 10 is provided, which is in contact with the second surface SS2 of the supporting means 13.
  • the web W is illuminated through the supporting means 13.
  • the camera 2 is placed on that side of the web W which is not supported by the supporting means, that is, on the side of the first surface S1 of the web.
  • the camera 2 detects the web substantially in the location that is exposed to the illumination.
  • the web W is illuminated by light penetrating the window 1 1 arranged in the illumination platform 10.
  • the camera and the light source are on opposite sides of the web W.
  • the illumination platform 10 is connected to the light source 1 via a light guide 12.
  • the device according to this embodiment can be used to measure a fiber web running very fast.
  • the web is supported all the time, wherein the risk of web breaks is very small. Because the illumination platform is in contact with the supporting means and not the web, possible markings caused to the web by the illumination platform are eliminated.
  • the image material produced by the camera 2 is led via the line 3 to the data processing equipment 4.
  • the data processing equipment 4 is a device of the type described earlier, for receiving, processing and storing image material. It can also be used for controlling the camera 2 and the light source 1.
  • the data processing equipment 4 and the light source 1 are connected to each other via a line 8.
  • the data processing equipment 4 is, as described earlier, connected to a user interface 5 comprising a display device 6 and one or more input devices 7.
  • the light source 1 shown in Figs. 2 and 3 is a diode laser light source. Preferably, it consists of more than one diode lasers so that the luminosity of the illumination emitted by the light source is sufficiently high.
  • the light source 1 emits pulsed light.
  • the embodiments of Figs. 2 and 3 are particularly well suited for measuring the formation of the web.
  • the camera used is a CCD or CMOS camera capturing still images of the web illuminated by a diode laser light source.
  • the light power of the illuminating pulses emitted by the diode laser light source is intense, and the pulse power of the light pulses is high. In the measurement of the formation, this improves spatial resolution and makes it possible to measure thick webs.
  • the light power of the illuminating pulses is so intense that they are capable of penetrating the supporting means shown in the embodiment of Fig. 3 and illuminating the fiber web on its other side so efficiently that the images of the web, captured by the camera, are sufficiently sharp images for determining the formation of the web.
  • the performance of the device is sufficient for measuring the formation of thick webs, such as cellulose webs with a basis weight exceeding even 1000 g/m 2 , through a supporting means.
  • Formation refers to the small-scale variation in the basis weight of the web. Variations in basis weight are due to the uneven distribution of the fiber pulp in the direction of the plane of the web, poor orientation of the fibers, and uneven distribution of possible fines in the web in the thickness direction of the web.
  • variations in the grey tone levels of the image material produced by the camera are analyzed, and a formation index is determined from them.
  • the camera used in the device may, as such, contain software components for storing and processing the image material captured by the camera.
  • the data processor may be a separate unit, or it may be integrated in the user interface.
  • the user interface may be a mobile device, for example a portable computer.

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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Paper (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de mesurer au moins une propriété d'une toile en mouvement. Ladite toile (W) est éclairée par une source lumineuse (1) et est détectée à l'aide d'une caméra (2) sensiblement au niveau de la zone éclairée. Une source lumineuse de laser à diodes est utilisée pour éclairer ladite toile (W).
PCT/FI2007/050503 2006-09-22 2007-09-21 Procédé et dispositif de mesure des propriétés d'une toile en mouvement Ceased WO2008034954A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20065586 2006-09-22
FI20065586A FI20065586A7 (fi) 2006-09-22 2006-09-22 Menetelmä ja laitteisto liikuvan rainan ominaisuuksien mittaamiseksi

Publications (2)

Publication Number Publication Date
WO2008034954A2 true WO2008034954A2 (fr) 2008-03-27
WO2008034954A3 WO2008034954A3 (fr) 2008-05-08

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PCT/FI2007/050503 Ceased WO2008034954A2 (fr) 2006-09-22 2007-09-21 Procédé et dispositif de mesure des propriétés d'une toile en mouvement

Country Status (2)

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FI (1) FI20065586A7 (fr)
WO (1) WO2008034954A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017060046A1 (fr) * 2015-10-05 2017-04-13 Andritz Ag Procédé et système de détermination de la contrainte hydraulique/mécanique exercée sur des bandes de cellulose
CN109387519A (zh) * 2017-08-04 2019-02-26 深圳市圆融精密电子有限公司 一种模切产品外观检测机
WO2020161389A1 (fr) * 2019-02-04 2020-08-13 Procemex Oy Système et procédé de surveillance pour la section humide d'une machine à papier ou à carton
SE1951544A1 (en) * 2019-12-20 2021-06-21 Stora Enso Oyj Method for determining film thickness, method for producing a film and device for producing a film
SE1951543A1 (en) * 2019-12-20 2021-06-21 Stora Enso Oyj Method for identifying defects in a film, method and device for producing a film

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4194840A (en) * 1978-02-27 1980-03-25 Serge Gracovetsky Sensor contact
US4770538A (en) * 1986-11-12 1988-09-13 Measurex Corporation Chopper wheel alignment device
DE3741195A1 (de) * 1987-07-23 1989-02-02 Gebhard Birkle Verfahren zur qualitaetskontrolle eines flaechigen objektes, insbesondere zur fehlererkennung bei textilen stoffen, und vorrichtung hierzu
DE59108634D1 (de) * 1990-12-08 1997-04-30 Schoeller F Jun Gmbh Co Kg Verfahren zur Untersuchung von bahnförmigem, durchscheinendem Material, insbesondere fotografischen Papierträgern
US5696591A (en) * 1996-01-05 1997-12-09 Eastman Kodak Company Apparatus and method for detecting longitudinally oriented flaws in a moving web
WO2001075423A1 (fr) * 2000-03-30 2001-10-11 Nippon Paper Industries Co., Ltd. Procede et appareil pour mesurer l'orientation de fibres de papier
JP2002090310A (ja) * 2000-09-19 2002-03-27 Sekisui Chem Co Ltd シート検査装置
FI110720B (fi) * 2001-04-09 2003-03-14 Metso Paper Automation Oy Menetelmä ja sovitelma mittalaitteen puhtaanapitämiseksi

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017060046A1 (fr) * 2015-10-05 2017-04-13 Andritz Ag Procédé et système de détermination de la contrainte hydraulique/mécanique exercée sur des bandes de cellulose
CN109387519A (zh) * 2017-08-04 2019-02-26 深圳市圆融精密电子有限公司 一种模切产品外观检测机
US11313080B2 (en) 2019-02-04 2022-04-26 Procemex Oy Monitoring system and method for wet end of a paper or board machine
WO2020161389A1 (fr) * 2019-02-04 2020-08-13 Procemex Oy Système et procédé de surveillance pour la section humide d'une machine à papier ou à carton
SE1951544A1 (en) * 2019-12-20 2021-06-21 Stora Enso Oyj Method for determining film thickness, method for producing a film and device for producing a film
WO2021124250A1 (fr) * 2019-12-20 2021-06-24 Stora Enso Oyj Procédé d'identification de défauts dans un film, procédé et dispositif de fabrication d'un film
WO2021124251A1 (fr) * 2019-12-20 2021-06-24 Stora Enso Oyj Procédé de détermination de l'épaisseur d'un film, procédé et dispositif de fabrication d'un film
SE543802C2 (en) * 2019-12-20 2021-07-27 Stora Enso Oyj Method for determining film thickness, method for producing a film and device for producing a film
SE543843C2 (en) * 2019-12-20 2021-08-10 Stora Enso Oyj Method for identifying defects in a film, method and device for producing a film
SE1951543A1 (en) * 2019-12-20 2021-06-21 Stora Enso Oyj Method for identifying defects in a film, method and device for producing a film
CN114787446A (zh) * 2019-12-20 2022-07-22 斯道拉恩索公司 识别膜中的缺陷的方法、生产膜的方法和装置
CN114867909A (zh) * 2019-12-20 2022-08-05 斯道拉恩索公司 测定膜厚度的方法、生产膜的方法和生产膜的装置
US12398996B2 (en) 2019-12-20 2025-08-26 Stora Enso Oyj Method for determining film thickness, method for producing a film and device for producing a film

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FI20065586A0 (fi) 2006-09-22
FI20065586L (fi) 2008-03-23
FI20065586A7 (fi) 2008-03-23
WO2008034954A3 (fr) 2008-05-08

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