WO1994002806A1 - Procede pour mesurer l'epaisseur de couchage lors de l'enduction de papier, dispositif de mise en ×uvre du procede et utilisation dudit dispositif - Google Patents

Procede pour mesurer l'epaisseur de couchage lors de l'enduction de papier, dispositif de mise en ×uvre du procede et utilisation dudit dispositif Download PDF

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Publication number
WO1994002806A1
WO1994002806A1 PCT/EP1993/001814 EP9301814W WO9402806A1 WO 1994002806 A1 WO1994002806 A1 WO 1994002806A1 EP 9301814 W EP9301814 W EP 9301814W WO 9402806 A1 WO9402806 A1 WO 9402806A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
paper
sheet
coating
deflection
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/EP1993/001814
Other languages
German (de)
English (en)
Inventor
Martin Schachtl
Max Brand
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.)
Jagenberg AG
Original Assignee
Jagenberg AG
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 Jagenberg AG filed Critical Jagenberg AG
Priority to EP93915876A priority Critical patent/EP0653049A1/fr
Priority to FI950338A priority patent/FI950338L/fi
Publication of WO1994002806A1 publication Critical patent/WO1994002806A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
    • 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
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
    • G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
    • G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
    • G01B5/066—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness of coating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness

Definitions

  • the invention relates to a method for measuring the line thickness when coating paper by means of a sheet-shaped doctor element which applies the coating ink to a paper web guided over a roller. Furthermore, the invention relates to a device for performing the method and a special use of this device.
  • Devices for coating paper webs or cardboard webs comprise the application unit, the drying device and measuring devices as basic elements.
  • the application unit which is also referred to as a coater, serves to apply the coating ink in the desired amount to the paper or cardboard surface and to level it.
  • the drying device is used to heat and evaporate or evaporate the water applied with the coating ink , so that the coating color forms a uniformly dry layer connected to the paper surface and the paper assumes the necessary moisture content for the next processing step.
  • measuring devices in front of the applicator and behind the dryer serve to continuously record and control the essential parameters, for example the line thickness of the coating color applied to the paper or cardboard web.
  • the object of the present invention is to detect the line thickness of the coated coating color without producing a larger reject.
  • this object is achieved in a generic method in that the distance from the blade tip of the sheet-shaped doctor element to the surface of the paper web is determined continuously by contactless measurement of the deflection of the blade tip of the sheet-shaped doctor element.
  • the distance between the blade tip of the sheet-like doctor element and the surface of the paper web is in a simple trigonometric relationship with the measured deflection of the sheet-like doctor element, so that due to the continuously measured deflection, the gap between the strike edge of the sheet-like doctor element and the surface of the paper web is immediate can be determined.
  • the line thickness The coating color differs from the gap measured in each case only by a constant factor which depends on the respective physical conditions of the coating color applied, the coated paper and the operating conditions. This constant factor can be determined by preliminary tests so that it is established for a defined pairing of a certain type of paper or cardboard with a corresponding coating color and the operating conditions.
  • the method according to the invention is characterized in that the deflection of the sheet-shaped doctor element is measured without contact.
  • the sheet-shaped doctor element can be exchanged without any problems after its wear and tear, without having to replace or connect corresponding sensors, which can optionally be attached to the doctor element.
  • Inductive or capacitive sensors or sensors based on eddy current are advantageously suitable for contactless measurement of the deflection of the doctor element.
  • the laser triangulation method can be used particularly advantageously.
  • the laser Doppler method can also be used for the contactless measurement of the deflection of the doctor element.
  • a device for carrying out the aforementioned method is characterized in that the distance measuring sensor for the contactless, continuous distance measurement is arranged in a holder of the sheet-shaped doctor element in such a way that the deflection of the blade tip of the sheet-like doctor element can be detected precisely.
  • the device according to the invention can also advantageously be used to determine the viscosity of the coating color under operating conditions, since apart from fixed geometric constants and material constants it depends on the thickness of the gap between the sheet-shaped doctor element and the surface of the paper web.
  • the device according to the invention can also advantageously be used for the early detection of a deterioration in the line quality and the deterioration of the running properties of the paper web, since vibrations of the bath or the floating of the bath can be recognized immediately.
  • Figure 1 is a system diagram of a coating device according to the prior art
  • Figure 2 is a schematic representation of the paper web surface and in the
  • Figure 3 is a schematic diagram to explain the laser triangulation used in the inventive method
  • Figure 4 is a schematic diagram to explain the measuring method according to the invention.
  • FIG. 1 shows a system diagram for a double-sided blade coating system 10.
  • the raw paper or the raw cardboard 12 is unwound from a supply roll 14 and passed through a measuring station 16, in which the basis weight and the basic moisture of the raw paper or the raw cardboard are measured.
  • the paper or cardboard web then runs through a first applicator unit 18, where the coating color is applied via a blade-shaped doctor element 20 - the so-called blade.
  • the paper or cardboard web then runs through a drying device 22 before it is fed to a measuring station 24, for example, based on the measurement of the finished weight, the coat weight of the surface layer spread on one side is determined.
  • the coating process is then repeated for the surface of the raw paper or raw cardboard web 12 that has not yet been coated in an application unit 26 before the paper or cardboard web passes through a dryer 28.
  • the coating weight of the second coated surface is then measured in a measuring station 30.
  • the paper or cardboard web 12 coated on both sides is rolled up onto a roll 32.
  • the deflection f of the sheet-shaped doctor element 20 measured continuously by means of a laser triangulation device 34 near the blade tip 36 of the sheet-shaped doctor element.
  • the distance s between the blade tip 36 of the sheet doctor element 20 and the surface of the paper or Cardboard web 12 corresponds to the layer thickness of the coating 38 passing between the paper surface 12 and the blade tip 36.
  • Const. and Const. ' depend on the raw paper or cardboard used, the coating color used and the selected machine parameters. This constant can be determined in advance for a certain material pairing and certain machine parameters, so that it is fixed for these parameters and can be called up, for example, from the memory of a central unit in the application.
  • the principle of the laser triangulation sensor 34 is shown in FIG. There, a laser beam 42 is emitted by a laser diode 40, which produces a light spot on the surface of the measurement object. This light spot is imaged with a receiving optic 44 in the sensor head on an elongated position-sensitive photodiode 46. The lateral displacement of the light spot on the photodiode 46 generates electrical currents which are a measure of the linear distance between the sensor 34 and the measurement object.
  • This laser triangulation sensor 34 is arranged in a holder 48 of the sheet-like doctor element 20 such that the laser beam 42 can be directed onto the sheet-like doctor element 20 near the blade tip 36 (see FIG. 2).
  • the measuring stations 24 and 30 can be dispensed with in order to determine a line thickness. Rather, once the system to be processed has been calibrated, the line thickness can be determined continuously and directly in the respective application units 18 and 26 given given operating parameters.
  • the viscosity of the coating color 38 can likewise be determined via the gap thickness s continuously determined for this purpose on the basis of the following relationships:
  • ⁇ stands for the dynamic viscosity of the coating color to be determined.
  • F v denotes the pretensioning path of the elastic sheet-shaped doctor element 20.
  • E stands for the modulus of elasticity of the sheet-like doctor element 20.
  • L denotes the projection of the sheet-like doctor element 20 (see FIG. 2).
  • Mi w 0 denotes the roller speed of the roller over which the paper or cardboard web 12 runs, h is the thickness of the sheet-shaped doctor element 20.
  • b is the width of the doctor element 20.
  • p denotes the density of the coating color.
  • K and K 2 are machine constants.
  • the continuously recorded viscosity of the coating color used is one of the determining parameters for the running properties of the coating color and thus the line quality. After the use according to the invention, this can be determined simultaneously with the line thickness.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un procédé pour mesurer l'épaisseur de couchage lors de l'enduction de papier (12) au moyen d'une racle (20) en forme de lame, qui applique le mélange de couchage sur une bande de papier (12) qui passe sur un rouleau. L'invention recommande de déterminer en continu la déviation de la racle (20) en forme de lame près du fil de la lame (36) en procédant à des mesures sans contact. Ce procédé permet de mesurer en continu l'écart entre l'arête de la racle (20) en forme de lame et la surface de la bande de papier, par simple rapport trigonométrique, ainsi que de déterminer en continu l'épaisseur de couchage directement dans le système d'application (18, 26), en se fondant sur un rapport fixe entre cet écart et ladite épaisseur de couchage. L'invention concerne en outre un procédé de mise en ÷uvre dudit procédé et une utilisation particulière de ce dispositif pour déterminer simultanément la viscosité du mélange de couchage.
PCT/EP1993/001814 1992-07-27 1993-07-10 Procede pour mesurer l'epaisseur de couchage lors de l'enduction de papier, dispositif de mise en ×uvre du procede et utilisation dudit dispositif Ceased WO1994002806A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP93915876A EP0653049A1 (fr) 1992-07-27 1993-07-10 Procede pour mesurer l'epaisseur de couchage lors de l'enduction de papier, dispositif de mise en uvre du procede et utilisation dudit dispositif
FI950338A FI950338L (fi) 1992-07-27 1993-07-10 Menetelmä pinnoituspaksuuden mittaamiseksi paperia pinnoitettaessa, menettely menetelmän suorittamiseksi, ja laitteiston käyttö

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DEP4224813.2 1992-07-27
DE4224813 1992-07-27
DEP4235824.8 1992-10-23
DE4235824A DE4235824A1 (de) 1992-07-27 1992-10-23 Verfahren zur Messung der Strichdicke beim Streichen von Papier, Vorrichtung zur Durchführung des Verfahrens und Verwendung der Vorrichtung

Publications (1)

Publication Number Publication Date
WO1994002806A1 true WO1994002806A1 (fr) 1994-02-03

Family

ID=25916965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1993/001814 Ceased WO1994002806A1 (fr) 1992-07-27 1993-07-10 Procede pour mesurer l'epaisseur de couchage lors de l'enduction de papier, dispositif de mise en ×uvre du procede et utilisation dudit dispositif

Country Status (4)

Country Link
EP (1) EP0653049A1 (fr)
DE (1) DE4235824A1 (fr)
FI (1) FI950338L (fr)
WO (1) WO1994002806A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6171642B1 (en) 1998-01-14 2001-01-09 Voith Sulzer Papiertechnik Patent Gmbh Method and apparatus for detecting and correcting an operating parameter during fiber web coating
US20210156672A1 (en) * 2018-04-06 2021-05-27 Bhs-Sonthofen Gmbh Device and method for measuring a filter cake thickness

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19715117A1 (de) * 1997-04-11 1998-10-15 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zum Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn
US7676298B2 (en) 2005-06-08 2010-03-09 Crc For Advanced Composite Structures Limited Method and apparatus for surface shaping of polymer composite components
CN101650160B (zh) * 2009-03-27 2013-04-03 嘉兴市清河高力绝缘有限公司 四辊涂漆机辊隙测调方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025976A2 (fr) * 1979-09-19 1981-04-01 Kabushiki Kaisha Toshiba Dispositif pour détecter l'épaisseur d'une feuille de papier
US4301598A (en) * 1980-05-23 1981-11-24 Molins Machine Company, Inc. Single faced corrugated web thickness sensing apparatus
WO1982001698A1 (fr) * 1980-11-07 1982-05-27 Tee Victor G Appareil de detection de l'epaisseur de feuilles
WO1987002018A1 (fr) * 1985-10-01 1987-04-09 Diebold, Incorporated Procede et appareil detecteur de feuilles multiples

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025976A2 (fr) * 1979-09-19 1981-04-01 Kabushiki Kaisha Toshiba Dispositif pour détecter l'épaisseur d'une feuille de papier
US4301598A (en) * 1980-05-23 1981-11-24 Molins Machine Company, Inc. Single faced corrugated web thickness sensing apparatus
WO1982001698A1 (fr) * 1980-11-07 1982-05-27 Tee Victor G Appareil de detection de l'epaisseur de feuilles
WO1987002018A1 (fr) * 1985-10-01 1987-04-09 Diebold, Incorporated Procede et appareil detecteur de feuilles multiples

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6171642B1 (en) 1998-01-14 2001-01-09 Voith Sulzer Papiertechnik Patent Gmbh Method and apparatus for detecting and correcting an operating parameter during fiber web coating
US20210156672A1 (en) * 2018-04-06 2021-05-27 Bhs-Sonthofen Gmbh Device and method for measuring a filter cake thickness
US12228391B2 (en) * 2018-04-06 2025-02-18 Bhs-Sonthofen Gmbh Device and method for measuring a filter cake thickness

Also Published As

Publication number Publication date
FI950338A0 (fi) 1995-01-26
FI950338A7 (fi) 1995-01-26
DE4235824A1 (de) 1994-02-03
EP0653049A1 (fr) 1995-05-17
FI950338L (fi) 1995-01-26

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