EP2156148A1 - Verfahren und vorrichtung zur messung wenigstens einer qualitätsgrösse, z.b. feuchte oder flächengewicht, einer faserstoffbahn, insbesondere papierbahn, durch bestimmen der resonanzfrequenz und der linienbreite eines durch die faserstoffbahn beeinflussten mikrowellenresonators, z.b. eines planaren ringresonators - Google Patents
Verfahren und vorrichtung zur messung wenigstens einer qualitätsgrösse, z.b. feuchte oder flächengewicht, einer faserstoffbahn, insbesondere papierbahn, durch bestimmen der resonanzfrequenz und der linienbreite eines durch die faserstoffbahn beeinflussten mikrowellenresonators, z.b. eines planaren ringresonatorsInfo
- Publication number
- EP2156148A1 EP2156148A1 EP08736007A EP08736007A EP2156148A1 EP 2156148 A1 EP2156148 A1 EP 2156148A1 EP 08736007 A EP08736007 A EP 08736007A EP 08736007 A EP08736007 A EP 08736007A EP 2156148 A1 EP2156148 A1 EP 2156148A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fibrous web
- microwave
- microwave resonator
- measuring
- measured
- 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- Withdrawn
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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G17/00—Apparatus for or methods of weighing material of special form or property
- G01G17/02—Apparatus for or methods of weighing material of special form or property for weighing material of filamentary or sheet form
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G9/00—Methods of, or apparatus for, the determination of weight, not provided for in groups G01G1/00 - G01G7/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/04—Investigating moisture content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/34—Paper
- G01N33/346—Paper paper sheets
Definitions
- the invention relates to a method for measuring at least one quality size of a particular running fibrous web, in particular paper or board web. It also relates to a corresponding measuring device.
- Measurements of paper qualities such as basis weight, moisture, filler content or filler compositions are usually made in the paper industry by means of traversing measuring units.
- a significant disadvantage of these measuring methods is that only a small part of the paper is measured, since the paper web moves at a speed of up to 2000 m / min under the measuring device while it is moved transversely over the paper web.
- microwaves are generated in the pulp suspension by means of a microwave resonator and above all the propagation velocity of the waves is measured.
- the invention has for its object to provide an improved method and an improved device of the type mentioned, in which the aforementioned disadvantages are eliminated. It should be as reliable as possible
- Measurement in various areas of the relevant manufacturing or paper machine that is to say a measurement in a region with a very moist fibrous web to be possible up to a region in which a finished or air-dried fibrous web is present.
- Paper or board web is to a very reliable measurement so very wet in various areas of the paper machine from one area
- This object is achieved according to the invention by a method for measuring at least one quality size of a particular running fibrous web, in particular paper or board web, in which the influenced by the fibrous web resonance curve measured at least one microwave resonator and determines the respective quality variable on the result of this measurement of the resonance curve becomes.
- the position of the resonance on the frequency axis and the shape or width of the resonance curve are preferably determined.
- at least one matched to a respective quality variable to be measured primary frequency is coupled into the microwave resonator.
- a plurality of different primary frequencies tuned to different quality variables to be measured can be coupled into the microwave resonator.
- At least one primary frequency coupled into the microwave resonator is tuned to the moisture content of the fibrous web to be measured.
- a respective microwave resonator is advantageously operated in a frequency range of about 1 to about 25 GHz, in particular in the range of 2.4 GHz and preferably in the range of 22 GHz.
- the frequency value of the primary frequency tuned to the basis weight to be measured preferably lies in a range in which all ingredients provided in the fibrous web have an at least substantially identical dielectric constant. This ensures that the fibrous web can be regarded as a uniform material to be measured.
- a relevant microwave resonator is preferably operated in a frequency range from about 22 to about 100,000 GHz, in particular in a frequency range from about 50 to about 500 GHz, and preferably in a frequency range from about 60 to about 300 GHz.
- At least one primary frequency coupled into the microwave resonator is tuned to at least one filler provided in the fibrous web. It is thus particular Also, a selective measurement of various fillers contained in the fibrous web possible. In addition, a combination of selective measurements allows a higher measurement accuracy to be achieved. Thus, according to a preferred practical embodiment of the method according to the invention by selectively selecting the primary frequencies selectively each provided in the fibrous web fillers and the moisture can be measured and the basis weight determined by a combination of these selective measurements.
- the measurement of the quality variable takes place while the material web is running by means of a plurality of stationary microwave resonators distributed over the width of the fibrous web.
- at least one quality variable can be measured simultaneously over the majority of the stationary microwave resonators distributed over the width of the fibrous web.
- the measurement of the quality variable is carried out while the material web is running by means of at least one microwave resonator traversing the width of the fibrous web.
- the method according to the invention is based on microwave technology, the corresponding sensor elements, that is to say microwave resonators, can be built sufficiently small for a non-traversing measurement.
- microwave components available on the market cover a large one
- Frequency range which makes it possible to separate different material properties or sizes as far as possible and to measure independently, as they behave completely different in different frequency ranges.
- the measuring principle is preferably based on the measurement of the resonance curve of a respective microwave resonator.
- the position of the resonance on the frequency axis and the shape or width of the resonance curve by the structure of the microwave resonator and by the material with which the resonator cooperates is determined.
- suitable choice of the primary frequencies, which are coupled into the microwave resonator various properties of the fibrous web or different paper properties can be measured.
- the decisive factor in this type of measurements is the dielectric constant of the particular material to be investigated, with which the resonator interacts.
- the dielectric constant determines the frequency and damping behavior of the resonator. This results from the different materials with which the resonator cooperates, a shift in the resonant frequency and a change in the resonance width. As the dielectric constant increases, the resonance frequency shifts to lower frequencies as the width of the resonance curve increases.
- water has a relative dielectric constant of 80, whereas fibers only have a relative dielectric constant of 3. This means that water can be selectively measured in this frequency range.
- the above-mentioned object is also achieved by a device for measuring at least one quality size of a particular running fibrous web, in particular paper or board web, with at least one microwave resonator, means for measuring by the
- Fibrous web influenced resonance curve of the microwave resonator
- Means for determining the respective quality variable on the result of the measurement of the resonance curve are provided.
- a plurality of stationary microwave resonators distributed over the width of the moving fibrous web are preferably provided.
- at least one microwave resonator traversing across the width of the fibrous web is provided.
- At least one microwave resonator for measuring the basis weight and at least one microwave resonator for measuring the moisture is provided.
- At least one microwave resonator comprises a planar microwave ring resonator.
- the circumference of the microwave ring resonator can be of the order of magnitude of the wavelength of the primary radiation used.
- the individual microwave resonators or microwave ring resonators can be embedded in a ceramic, a roller or a press nip. This allows the distance between the sensor elements or microwave resonators and the fibrous web are kept constant.
- Determine fibrous web serving controlled variable It can be determined from the different quality sizes, for example, the otro weight of the paper, which results from the difference between the basis weight and the moisture.
- dependent measurements can also be separated by such a combined arrangement of microwave resonators for measuring different quality variables.
- the influence of moisture on the basis weight measurement can be considered or eliminated.
- the device according to the invention can also be used as part of a measuring system for measuring the basis weight cross profile and / or the moisture cross profile and / or the filler cross profile and / or the basis weight longitudinal profile and / or the moisture longitudinal profile of a fibrous web, in particular paper - or cardboard web to be formed.
- the microwave resonators in the machine direction and / or in the cross-machine direction at different points in the manufacturing machine, in particular paper or board machine may be appropriate.
- at least one microwave resonator can be displaceably mounted in the production machine, whose displacement can be detected and taken into account in the evaluation of the measurement signals.
- Microwave radiation devices are used.
- the individual microwave resonator can also be close to the paper web with an air cushion, but at most slightly touching it. Moreover, it may be embedded in a machine component of the manufacturing machine which contacts the fibrous web. In this case, the microwave resonator can simultaneously detect the fibrous web and a circulating belt, such as a forming fabric, a press felt or a dryer fabric.
- a circulating belt such as a forming fabric, a press felt or a dryer fabric.
- a microwave resonator and on the other side of the fibrous web a metallic reflector, such as a metallic bar or a roller, or a defined dielectric, such as a solid or hollow body, may be arranged.
- Figure 1 is a diagram in which two are different
- FIG. 2 is a schematic plan view of a planar microwave
- FIG. 1 shows a diagram in which two resonance curves 10, 12 of a microwave resonator resulting for different materials are shown.
- the frequency is plotted on the abscissa axis and the amplitude on the ordinate axis.
- the respective minimum of the two resonance curves 10, 12 occurs at the respective resonance frequency f res .
- With “14" or “16" the respective width of the resonance curves is shown.
- different materials or a different nature of the fibrous web with which the respective microwave resonator acts result in a shift of the resonant frequency f res and a change in the width of the resonant curve.
- the resonance frequency f res shifts to lower values, while the width of the resonance curve increases, as indicated by the two different resonance curves 10 and 12 in FIG.
- At least one microwave resonator of the device is formed by a microwave ring resonator.
- all of the microwave resonators of the device may each be formed by such a microwave ring resonator.
- FIG. 2 shows, in a schematic plan view, such a planar microwave ring resonator 18.
- the circumference of the microwave ring resonator can be of the order of the wavelength of the primary radiation used.
- a frequency or resonance frequency of 100 GHz corresponds to a circumference of the resonator of 3 mm.
- planar microwave ring resonators 18 may in particular be mounted parallel to one another over the entire machine width in order to achieve a non-traversing simultaneous measurement of at least one quality variable of the
- At least one microwave resonator 18 traversing the width of the fibrous web may also be provided.
- the individual microwave ring resonators 18 can be embedded in a ceramic, a roller or a press nip, for example.
- An advantage of this embodiment is that the distance between a respective sensor element or resonator and the fibrous web is kept constant.
- At least one microwave ring resonator 18 for measuring the basis weight and at least one microwave ring resonator 18 for measuring the moisture can be provided.
- dependent measurements can be separated by means of such an arrangement. For example, the influence of moisture on the basis weight measurement can be considered or eliminated.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007025815A DE102007025815A1 (de) | 2007-06-02 | 2007-06-02 | Verfahren und Vorrichtung zur Messung wenigstens einer Qualitätsgröße einer Faserstoffbahn |
PCT/EP2008/054282 WO2008148596A1 (de) | 2007-06-02 | 2008-04-09 | Verfahren und vorrichtung zur messung wenigstens einer qualitätsgrösse, z.b. feuchte oder flächengewicht, einer faserstoffbahn, insbesondere papierbahn, durch bestimmen der resonanzfrequenz und der linienbreite eines durch die faserstoffbahn beeinflussten mikrowellenresonators, z.b. eines planaren ringresonators |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2156148A1 true EP2156148A1 (de) | 2010-02-24 |
Family
ID=39495309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08736007A Withdrawn EP2156148A1 (de) | 2007-06-02 | 2008-04-09 | Verfahren und vorrichtung zur messung wenigstens einer qualitätsgrösse, z.b. feuchte oder flächengewicht, einer faserstoffbahn, insbesondere papierbahn, durch bestimmen der resonanzfrequenz und der linienbreite eines durch die faserstoffbahn beeinflussten mikrowellenresonators, z.b. eines planaren ringresonators |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100141270A1 (de) |
EP (1) | EP2156148A1 (de) |
JP (1) | JP2010529440A (de) |
DE (1) | DE102007025815A1 (de) |
WO (1) | WO2008148596A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8448572B2 (en) | 2010-06-24 | 2013-05-28 | Xerox Corporation | Web printing systems having system resonance tuner |
DE102010063232A1 (de) * | 2010-12-16 | 2012-06-21 | Voith Patent Gmbh | Vorrichtung und Verfahren zur Flächengewichtsbestimmung |
DE102011082836A1 (de) * | 2011-09-16 | 2013-03-21 | Voith Patent Gmbh | Verfahren zum Steuern und Regeln einer Papiermaschine |
DE102011083653A1 (de) * | 2011-09-28 | 2013-03-28 | Voith Patent Gmbh | Messvorrichtung und Messverfahren zur Messung von Bahneigenschaften |
US20150292158A1 (en) * | 2012-09-28 | 2015-10-15 | Voith Patent Gmbh | Method for controlling the formation of a fiber web of a fiber or paper producing process |
JP6736001B2 (ja) * | 2016-01-29 | 2020-08-05 | 国立大学法人京都大学 | センサic |
DE102016114287A1 (de) * | 2016-08-02 | 2018-02-08 | Tews Elektronik Gmbh & Co. Kg | Vorrichtung und Verfahren zur Messung von absorbierenden Hygieneartikeln |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1106185A (en) * | 1964-05-29 | 1968-03-13 | Nils Bertil Agdur | Device for measuring a property of a material |
JPS63145951A (ja) * | 1986-12-09 | 1988-06-18 | Daipoole:Kk | 糸状材料の物性量測定装置 |
ES2018019B3 (es) * | 1987-04-23 | 1991-03-16 | Imatran Voima Oy | Metodo y aparato para medir propiedades de chapas o materiales en forma de hojas de baja conductividad electrica |
JPH02272349A (ja) * | 1989-04-14 | 1990-11-07 | Nippon Tokushu Keisokki Seisakusho:Kk | マイクロ波による坪量水分測定装置 |
DE4004119A1 (de) * | 1990-02-10 | 1991-08-14 | Tews Elektronik Dipl Ing Manfr | Verfahren zur messung der feuchte eines messgutes mit hilfe von mikrowellen und vorrichtung zur durchfuehrung des verfahrens |
US7151380B2 (en) | 2004-08-06 | 2006-12-19 | Voith Paper Patent Gmbh | Microwave water weight sensor and process |
US20060208194A1 (en) * | 2005-03-18 | 2006-09-21 | Voith Paper Patent Gmbh | Microwave mass measuring device and process |
-
2007
- 2007-06-02 DE DE102007025815A patent/DE102007025815A1/de not_active Withdrawn
-
2008
- 2008-04-09 WO PCT/EP2008/054282 patent/WO2008148596A1/de active Application Filing
- 2008-04-09 JP JP2010510709A patent/JP2010529440A/ja active Pending
- 2008-04-09 EP EP08736007A patent/EP2156148A1/de not_active Withdrawn
-
2009
- 2009-12-02 US US12/629,178 patent/US20100141270A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2008148596A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2010529440A (ja) | 2010-08-26 |
US20100141270A1 (en) | 2010-06-10 |
DE102007025815A1 (de) | 2008-12-04 |
WO2008148596A1 (de) | 2008-12-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2156148A1 (de) | Verfahren und vorrichtung zur messung wenigstens einer qualitätsgrösse, z.b. feuchte oder flächengewicht, einer faserstoffbahn, insbesondere papierbahn, durch bestimmen der resonanzfrequenz und der linienbreite eines durch die faserstoffbahn beeinflussten mikrowellenresonators, z.b. eines planaren ringresonators | |
DE102007041429B4 (de) | Verfahren und Vorrichtung zur Messung eines Feuchtewertes von dielektrischen Stoffen | |
EP2404512B1 (de) | Vorrichtung zur Herstellung von Zigaretten in der tabakverarbeitenden Industrie | |
DE10037180C1 (de) | Verfahren zum Detektieren und Selektieren von Fremdkörpern in Cigaretten | |
DE19510009C2 (de) | Verfahren und Vorrichtung zur Prozeßführung einer Papiermaschine | |
EP0791823A2 (de) | Verfahren und Anordnung zum Erfassen mindestens einer Eigenschaft eines Stoffes | |
WO2012080010A1 (de) | Flächengewichtsbestimmung einer materialbahn mit einem mikrowellensensor, wobei die abstände zwischen der materialbahn und den oberflächen des mikrowellensensors mit luftkissen auf einen konstanten wert geregelt werden | |
EP1933132A2 (de) | Verfahren und Vorrichtung zur Bestimmung der Feuchte einer laufenden Materialbahn | |
DE102015119453B4 (de) | Vorrichtung und Verfahren zur Bestimmung des Anteils mindestens eines Zusatzstoffs in einem tabakhaltigen Stoff, und Maschine der Tabak verarbeitenden Industrie | |
DE112006001212B4 (de) | Verfahren und Messgerät zur Messung von Wassergehalt | |
WO2013037931A1 (de) | Vorrichtung und verfahren zum steuern und regeln einer papiermaschine | |
DE4221395C2 (de) | Verfahren zum zerstörungsfreien Bestimmen eines mit der breitenbezogenen Bruchkraft korrelierenden Kennwertes an einer laufenden Papierbahn | |
DE102008000267A1 (de) | Verfahren zur Entwässerung und Entwässerungsvorrichtung | |
EP1371978A1 (de) | Mikrowellenvorrichtung zur Qualitätsprüfung strangförmiger Materialien | |
DE102016114286B3 (de) | Verfahren zur Messung von absorbierenden Hygieneartikeln | |
WO2018024735A1 (de) | Vorrichtung und verfahren zur messung von absorbierenden hygieneartikeln | |
DE102011082845A1 (de) | Messsystem und Verfahren zum Bestimmen und Regeln von flächenbezogenen Aufträgen | |
EP2152966A1 (de) | Vorrichtung mit im betrieb rotierender oder umlaufender oberfläche | |
WO2018077552A1 (de) | Entwässerungsvorrichtung und verfahren zur setuerung einer maschine zur herstellung einer faserstoffbahn | |
DE10121775A1 (de) | Verfahren und Vorrichtung zum Kalibrieren von Stoffdichtesensoren | |
DE10305598A1 (de) | Messverfahren und Messeinrichtung zur Bestimmung des Feuchtigkeitsgehaltes einer Materialbahn | |
DE102008052163A1 (de) | Messverfahren und Messsystem | |
DE102007019486A1 (de) | Verfahren zur Bestimmung der Festigkeit einer Faserstoffbahn in Dickenrichtung | |
DE10312836A1 (de) | Vorrichtung zur Herstellung einer Faserstoffbahn | |
DE102004060036A1 (de) | Verfahren und Vorrichtung zur Messung der Feuchte einer Materialbahn |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20100104 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MOSES, SUSANNE Inventor name: ISCHDONAT, THOMAS Inventor name: HAAG, JENS Inventor name: JOHANSSON, HELENA Inventor name: MUENCH, RUDOLF Inventor name: KAUFMANN, OLIVER |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MOSES, SUSANNE Inventor name: ISCHDONAT, THOMAS Inventor name: HAAG, JENS Inventor name: JOHANSSON, HELENA Inventor name: MUENCH, RUDOLF Inventor name: KAUFMANN, OLIVER |
|
17Q | First examination report despatched |
Effective date: 20100316 |
|
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20100927 |