EP0622492B1 - Coating device for a travelling web of paper or cardboard - Google Patents

Coating device for a travelling web of paper or cardboard Download PDF

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Publication number
EP0622492B1
EP0622492B1 EP94105841A EP94105841A EP0622492B1 EP 0622492 B1 EP0622492 B1 EP 0622492B1 EP 94105841 A EP94105841 A EP 94105841A EP 94105841 A EP94105841 A EP 94105841A EP 0622492 B1 EP0622492 B1 EP 0622492B1
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EP
European Patent Office
Prior art keywords
blade
light
web
reflecting layer
arrangement according
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.)
Expired - Lifetime
Application number
EP94105841A
Other languages
German (de)
French (fr)
Other versions
EP0622492A2 (en
EP0622492A3 (en
Inventor
Martin Dr. Kustermann
Sergio Giuste
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0622492A2 publication Critical patent/EP0622492A2/en
Publication of EP0622492A3 publication Critical patent/EP0622492A3/en
Application granted granted Critical
Publication of EP0622492B1 publication Critical patent/EP0622492B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades
    • 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
    • B05C11/04—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 with blades
    • B05C11/041—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 with blades characterised by means for positioning, loading, or deforming the blades

Definitions

  • the invention relates to an arrangement for metering coating slip onto a running web of paper or cardboard.
  • the metering device according to the invention uses a so-called doctor blade in coating systems, this doctor blade can be assigned a feed device for the coating compound directly or at a distance of perhaps 30-50 cm along the circumference of a roller guiding the web of paper or cardboard. It may also be the case that the paper web only runs onto the roller later, so that the bare roller shell is first coated and the coating slip is only transferred later from the roller shell to the paper web.
  • a generic device is known from EP-A 04 26 980.
  • this application e.g. also describes a measuring device with a transmitter which emits light which is emitted by a light-sensitive receiver arrangement, e.g. is registered in the form of a diode array or a CCD camera. The output signal of these arrangements is then processed to adjust the angular position of the blade with respect to the circumference of the roller at the point of contact of the blade thereon. All measuring devices described in this application, despite their miniature design, are still relatively large and have a weight that is not to be neglected.
  • the object of the invention is to provide such a measuring device in which a sensor with a noticeable weight is avoided. Another object is also to design the measuring device in such a way that the blade, including the measured value transmission devices, can be changed quickly.
  • the doctor blade Due to the light-sensitive layer applied to the blade, which sends the light reflected by a transmitter onto this light according to the known law of reflection to a receiver, the doctor blade is only locally loaded by negligible additional weights, and a quick change is possible. If a reflection strip is used, it can be applied to the blade before it is installed. If a mirror plate is used as the reflecting layer of the blade, favorable angles of incidence and reflection of the measuring beams can be achieved by the carrier of the mirror surface being wedge-shaped. The carrier may also be magnetic so that it can be quickly attached to and removed from the blade.
  • a contactless arrangement on an inductive or capacitive or ultrasound basis, the sensor being arranged at a specific distance from the pressure bar or the clamping of the blade, so that, based on the determination of the distance of the blade from the sensor in this area and taking into account the contact pressure of the blade, the angle of the blade can be calculated.
  • the doctor blade 2 is clamped in the jaws 3 and 4 of a holder and is pressed against the counter roller R by means of a pressure bar 5, which is held displaceably between guide plates 23 and 29 according to the double arrow.
  • a transmitter for light in particular laser light 9, is provided, which sends a light beam 12 onto a light reflection layer 8 ', from where the reflected beam 13 reaches the receiver 10 in the form of a CCD arrangement with a spread angle ⁇ .
  • the reflection layer 8 ' here is a mirror layer of a mirror plate 6, which is detachably attached to the coating blade by means of a magnetic carrier plate 7 (since the coating blade is known to consist of magnetizable steel).
  • the carrier plate 7 is wedge-shaped with an angle c in order to obtain a favorable course of the incident beam 12 and the reflection beam 13. This gives you enough space to be able to attach the transmitter 9 and the receiver 10 in the vicinity of the doctor blade in a favorable manner.
  • the reflection layer 8 can also be applied to a film 11 which can be glued to the doctor blade 2 or - designed as a magnetic film - can simply be placed on the doctor blade. You can use a strip of e.g. Use a length of 5 cm and attach it to the right place before installing the doctor blade. This minimizes the downtime of the coating system when changing the coating blade.
  • the signal from the receiver 10 is then sent to a control device, not shown here, in order to be able to adjust the angle of the doctor blade.
  • a control device not shown here
  • the actual coating edge also runs according to this angle the blade end with respect to the counter roller R or the paper web guided by it.
  • the chamfer f should run exactly tangential to the counter roller and paper web.
  • the paper web or roller R runs past the doctor blade at the speed v in accordance with the arrow shown.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Replacement Of Web Rolls (AREA)

Abstract

An arrangement for dosing with a blade, in coating machines or similar, onto a running web of paper or cardboard carried by a roll in or with the arrangement. The blade is forced by means of a hold-down or several hold-down sections on the roll respectively the web. A transmitter transmits light, notably laser light. The blade features in the area between the contact line of the hold-down on it, and its contact line on the roll respectively the web, on its side away from the roll, at least one light-reflecting layer for reflection of the light ray directed by the transmitter at the layer. A receiver registers the position or angle of the ray reflected upon it by the light-reflecting layer of the blade. A controller is provided for controlling, dependent on the position signal of the receiver for the reflected light ray, the angular position of the blade, notably in its area between the contact line of the hold-down or the hold-down section and the roll.

Description

Die Erfindung betrifft eine Anordnung zum Dosieren von Streichmasse auf eine laufende Bahn aus Papier oder Karton. Die erfindungsgemäße Dosiereinrichtung verwendet eine sogenannte Streichklinge in Streichanlagen, wobei dieser Streichklinge eine Zufuhreinrichtung für die Streichmasse unmittelbar oder in einiger Entfernung von vielleicht 30-50 cm entlang dem Umfang einer die Bahn aus Papier oder Karton führenden Walze zugeordnet sein kann. Es kann auch so sein, daß die Papierbahn erst später auf die Walze aufläuft, so daß zunächst eine Beschichtung des bloßen Walzenmantels erfolgt und erst später eine Übertragung der Streichmasse von dem Walzenmantel auf die Papierbahn vorgenommen wird.The invention relates to an arrangement for metering coating slip onto a running web of paper or cardboard. The metering device according to the invention uses a so-called doctor blade in coating systems, this doctor blade can be assigned a feed device for the coating compound directly or at a distance of perhaps 30-50 cm along the circumference of a roller guiding the web of paper or cardboard. It may also be the case that the paper web only runs onto the roller later, so that the bare roller shell is first coated and the coating slip is only transferred later from the roller shell to the paper web.

Eine gattungsbildende Einrichtung ist bekannt aus der EP-A 04 26 980. In dieser Anmeldung ist z.B. auch eine Meßeinrichtung mit einem Sender beschrieben, der Licht emittiert, welches von einer lichtempfindlichen Empfängeranordnung, z.B. in Form einer Dioden-Reihenanordnung oder einer CCD-Kamera registriert wird. Das Ausgangssignal dieser Anordnungen wird dann weiterverarbeitet, um die Winkellage der Klinge in Bezug auf den Walzenumfang im Anlagepunkt der Klinge an demselben einzustellen. Alle in dieser Anmeldung beschriebenen Meßeinrichtungen sind trotz ihrer Miniaturausführung immer noch relativ groß und haben ein nicht ganz zu vernachlässigendes Gewicht.A generic device is known from EP-A 04 26 980. In this application e.g. also describes a measuring device with a transmitter which emits light which is emitted by a light-sensitive receiver arrangement, e.g. is registered in the form of a diode array or a CCD camera. The output signal of these arrangements is then processed to adjust the angular position of the blade with respect to the circumference of the roller at the point of contact of the blade thereon. All measuring devices described in this application, despite their miniature design, are still relatively large and have a weight that is not to be neglected.

Die Aufgabe der Erfindung ist es, eine derartige Meßeinrichtung anzugeben, bei welcher ein Sensor mit merkbarem Gewicht vermieden ist. Eine andere Aufgabe ist es auch, die Meßeinrichtung so auszubilden, daß ein schnelles Wechseln der Klinge einschließlich der Meßwertübertragungseinrichtungen möglich ist.The object of the invention is to provide such a measuring device in which a sensor with a noticeable weight is avoided. Another object is also to design the measuring device in such a way that the blade, including the measured value transmission devices, can be changed quickly.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des des Patentanspruchs 1 gelöst.This object is achieved by the features of claim 1.

Durch die lichtempfindliche auf der Klinge aufgebrachte Schicht, die das von einem Sender auf diese gestrahlte Licht nach dem bekannten Reflexionsgesetz reflektierte Licht zu einem Empfänger schickt, wird die Streichklinge nur örtlich durch zu vernachlässigende zusätzliche Gewichte belastet, und ein schnelles Wechseln derselben ist möglich. Bei der Verwendung eines Reflexionsstreifens kann dieser bereits vor Montage der Klinge auf dieser aufgebracht werden. Verwendet man ein Spiegelplättchen als reflektierende Schicht der Klinge können günstige Einfalls- und Ausfallswinkel der Meßstrahlen erreicht werden, indem der Träger der Spiegelfläche keilförmig ausgebildet ist. Der Träger kann ferner magnetisch sein, so daß ein schnelles Anheften an der Klinge und Entfernen von derselben möglich ist.Due to the light-sensitive layer applied to the blade, which sends the light reflected by a transmitter onto this light according to the known law of reflection to a receiver, the doctor blade is only locally loaded by negligible additional weights, and a quick change is possible. If a reflection strip is used, it can be applied to the blade before it is installed. If a mirror plate is used as the reflecting layer of the blade, favorable angles of incidence and reflection of the measuring beams can be achieved by the carrier of the mirror surface being wedge-shaped. The carrier may also be magnetic so that it can be quickly attached to and removed from the blade.

Es ist auch eine berührungsfreie Anordnung auf induktiver oder kapazitiver oder Ultraschall-Basis möglich, wobei der Sensor in einer bestimmten Entfernung von der Andruckleiste bzw. der Einspannung der Klinge angeordnet wird, so daß aufgrund der Ermittlung des Abstandes der Klinge vom Sensor in diesem Bereich und unter Berücksichtigung der Anpreßkraft der Klinge der Winkel der Klinge berechnet werden kann.It is also possible to use a contactless arrangement on an inductive or capacitive or ultrasound basis, the sensor being arranged at a specific distance from the pressure bar or the clamping of the blade, so that, based on the determination of the distance of the blade from the sensor in this area and taking into account the contact pressure of the blade, the angle of the blade can be calculated.

Nachfolgend wird die Erfindung anhand der in den Figuren der Zeichnung dargestellten Ausführungsbeispiele erläutert, wobei im einzelnen darstellen:

Figur 1
eine prinzipmäßige Darstellung in Seitenansicht der erfindungsgemäßen Meßeinrichtung,
Figur 2
eine Einzelheit im Bereich der Anlagekante der Klinge an der Gegenwalze in vergrößertem Maßstab,
Figur 3
eine entsprechende Anordnung einer anderen Variante.
The invention is explained below on the basis of the exemplary embodiments illustrated in the figures of the drawing, in which:
Figure 1
a schematic representation in side view of the measuring device according to the invention,
Figure 2
a detail in the area of the contact edge of the blade on the counter roller on an enlarged scale,
Figure 3
a corresponding arrangement of another variant.

In Figur 1 ist die Streichklinge 2 eingespannt in die Klemmbacken 3 und 4 eines Halters und wird an die Gegenwalze R mittels einer Druckleiste 5 angepreßt, die zwischen Führungsplatten 23 und 29 entsprechend dem Doppelpfeil verschieblich gehalten ist. Es ist ein Sender für Licht, insbesondere Laserlicht 9 vorgesehen, der einen Lichtstrahl 12 auf eine Lichtreflexionsschicht 8' schickt, von wo der reflektierte Strahl 13 zu dem Empfänger 10 in Form einer CCD-Anordnung mit einem Spreizungswinkel a gelangt. Die Reflexionsschicht 8' ist hier eine Spiegelschicht eines Spiegelplättchens 6, das mittels einer magnetischen Trägerplatte 7 an der Streichklinge lösbar befestigt ist (da ja die Streichklinge bekanntermaßen aus magnetisierbarem Stahl bestehen). Die Trägerplatte 7 ist keilförmig mit einem Winkel c ausgebildet, um einen günstigen Verlauf von Einfallsstrahl 12 und Reflexionsstrahl 13 zu erhalten. Dadurch gewinnt man genügend Raum, um in günstiger Weise den Sender 9 und den Empfänger 10 in der Nähe der Streichklinge anbringen zu können.In Figure 1, the doctor blade 2 is clamped in the jaws 3 and 4 of a holder and is pressed against the counter roller R by means of a pressure bar 5, which is held displaceably between guide plates 23 and 29 according to the double arrow. A transmitter for light, in particular laser light 9, is provided, which sends a light beam 12 onto a light reflection layer 8 ', from where the reflected beam 13 reaches the receiver 10 in the form of a CCD arrangement with a spread angle α. The reflection layer 8 'here is a mirror layer of a mirror plate 6, which is detachably attached to the coating blade by means of a magnetic carrier plate 7 (since the coating blade is known to consist of magnetizable steel). The carrier plate 7 is wedge-shaped with an angle c in order to obtain a favorable course of the incident beam 12 and the reflection beam 13. This gives you enough space to be able to attach the transmitter 9 and the receiver 10 in the vicinity of the doctor blade in a favorable manner.

In Figur 3 ist dargestellt, daß die Reflexionsschicht 8 auch auf einer Folie 11 aufgebracht sein kann, die auf die Streichklinge 2 aufgeklebt werden kann oder - als Magnetfolie ausgebildet - einfach auf die Streichklinge aufgesetzt werden kann. Man kann hier einen Streifen von z.B. 5 cm Länge benutzen und diesen bereits vor Montage der Streichklinge auf dieser an der richtigen Stelle anbringen. Dadurch wird die Ausfallzeit der Streichanlage bei einem Wechsel der Streichklinge äußerst gering.In Figure 3 it is shown that the reflection layer 8 can also be applied to a film 11 which can be glued to the doctor blade 2 or - designed as a magnetic film - can simply be placed on the doctor blade. You can use a strip of e.g. Use a length of 5 cm and attach it to the right place before installing the doctor blade. This minimizes the downtime of the coating system when changing the coating blade.

Das Signal von dem Empfänger 10 wird dann auf eine hier nicht dargestellte Regeleinrichtung gegeben, um den Winkel der Streichklinge einstellen zu können. Gemeint ist damit der Winkel b, mit dem die Streichklinge in Figur 1 und 2 an der Gegenwalze R anliegt. Entsprechend diesem Winkel verläuft ja auch die eigentliche Streichkante (Fase f) an dem Klingenende in Bezug auf die Gegenwalze R bzw. die von dieser geführten Papierbahn. Die Fase f soll natürlich genau tangential zur Gegenwalze und Papierbahn verlaufen. Dabei läuft die Papierbahn bzw. Walze R mit der Geschwindigkeit v entsprechend dem dargestellten Pfeil an der Streichklinge vorbei.The signal from the receiver 10 is then sent to a control device, not shown here, in order to be able to adjust the angle of the doctor blade. What is meant by this is the angle b with which the doctor blade lies against the counter roller R in FIGS. 1 and 2. The actual coating edge (chamfer f) also runs according to this angle the blade end with respect to the counter roller R or the paper web guided by it. Of course, the chamfer f should run exactly tangential to the counter roller and paper web. The paper web or roller R runs past the doctor blade at the speed v in accordance with the arrow shown.

Claims (8)

  1. Arrangement for metering a coating mixture onto a running paper or cardboard web which is guided in particular by a roller (R) in or by the arrangement, in which
    (a) a blade (2) is pressed onto the web - at least also - by means of a pressure pad (5) or a plurality of pressure elements,
    (b) there is a transmitter (9) for light - in particular laser light,
    (c) the blade (2) in the region between the bearing line of the pressure pad (5) or plurality of pressure elements thereon and its bearing line on the web comprises at least one light reflecting layer (8) on its side facing away from the blade to reflect the beam of light (12) transmitted by the transmitter (9) onto the layer (8),
    (d) a receiver (10) is provided for recording the position or the angle of the beam (13) reflected on it by the light reflecting layer (8) of the blade (2) and
    (e) there is a control device (30) to control the angular position of the blade (2) in its zone between the bearing line of the pressure pad (5) or the pressure element and the web in dependency on the positioning signal of the receiver (10) for the reflected beam of light (13).
  2. Arrangement according to claim 1, characterised in that the pressure pad (5) is designed to be flexible in direction - perpendicular - to the blade.
  3. Arrangement according to claim 1 or 2, characterised by regulating devices which are distributed evenly along the blade length and serve to adjust locally the pressing force of the blade (2) via the pressure pad (5) or pressure elements.
  4. Arrangement according to one of claims 1 - 3, characterised in that the light reflecting layer (8) is made of a foil (11).
  5. Arrangement according to one of claims 1 - 3, characterised in that the light reflecting layer (8') is attached to magnetic chips or strips as carriers (7) for securing it onto the blade.
  6. Arrangement according to claim 5, characterised in that the magnetic carrier (7) is wedge-shaped in order to permit an adjustment of the desired incident and emergence angle of the transmitted beam of light (12) in relation to the plane which passes through the blade (2) in the region of its bearing line on the web.
  7. Arrangement according to claim 6, characterised in that the carrier (7) and the light reflecting layer (8') attached thereto are designed as glass mirror chips (6) which are at most 25 mm2 in size.
  8. Arrangement according to claim 3, characterised in that the weight per unit area of the foil including the light reflecting layer (8) is at most 50 g/m2.
EP94105841A 1993-04-28 1994-04-15 Coating device for a travelling web of paper or cardboard Expired - Lifetime EP0622492B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4313889A DE4313889C2 (en) 1993-04-28 1993-04-28 Coating device for running webs of paper or cardboard
DE4313889 1993-04-28

Publications (3)

Publication Number Publication Date
EP0622492A2 EP0622492A2 (en) 1994-11-02
EP0622492A3 EP0622492A3 (en) 1994-11-17
EP0622492B1 true EP0622492B1 (en) 1997-01-29

Family

ID=6486581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94105841A Expired - Lifetime EP0622492B1 (en) 1993-04-28 1994-04-15 Coating device for a travelling web of paper or cardboard

Country Status (7)

Country Link
US (1) US5453128A (en)
EP (1) EP0622492B1 (en)
JP (1) JPH0731922A (en)
AT (1) ATE148513T1 (en)
CA (1) CA2122323A1 (en)
DE (2) DE4313889C2 (en)
FI (1) FI107749B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19715117A1 (en) * 1997-04-11 1998-10-15 Voith Sulzer Papiermasch Gmbh Assembly to coat a moving web
DE19731947A1 (en) * 1997-07-24 1999-01-28 Voith Sulzer Papiermasch Gmbh Liquid or paste applicator regulation method
DE19751098C2 (en) * 1997-11-18 2003-02-20 Voith Paper Patent Gmbh Method and device for adjusting an elongate component, which extends in the width direction of a running material web
ATE361833T1 (en) * 2004-11-30 2007-06-15 Oxy Dry Maschinen Gmbh METHOD AND DEVICE FOR CLEANING CYLINDERS OF A PRINTING MACHINE
DE102008001265A1 (en) * 2008-04-18 2009-10-22 Voith Patent Gmbh Scraper device and squeegee device
DE102016222203B4 (en) * 2016-11-11 2019-03-14 Koenig & Bauer Ag Doctor blade device and a gravure printing machine with a squeegee device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2913421C3 (en) * 1979-04-04 1982-04-29 J.M. Voith Gmbh, 7920 Heidenheim Method and device for stripping off excess coating material from a moving web
DE3001073B1 (en) * 1980-01-14 1981-06-04 Jagenberg-Werke AG, 4000 Düsseldorf Device for applying a coating to a material web
DE3236991A1 (en) * 1982-10-06 1984-04-12 J.M. Voith Gmbh, 7920 Heidenheim Coating device for running webs of material
CA1313757C (en) * 1988-04-26 1993-02-23 Mitsubishi Denki Kabushiki Kaisha Method for measuring film thickness
JPH0273112A (en) * 1988-09-07 1990-03-13 Fuji Electric Co Ltd Photoelectric device
DE3937322A1 (en) * 1989-11-09 1991-05-16 Zanders Feinpapiere Ag METHOD FOR OPERATING A COATING DEVICE
US5338361A (en) * 1991-11-04 1994-08-16 Measurex Corporation Multiple coat measurement and control apparatus and method
US5242498A (en) * 1992-08-04 1993-09-07 The Kohler Coating Machinery Corporation Adjustable blade coater

Also Published As

Publication number Publication date
US5453128A (en) 1995-09-26
ATE148513T1 (en) 1997-02-15
DE59401676D1 (en) 1997-03-13
FI107749B (en) 2001-09-28
DE4313889A1 (en) 1993-10-21
JPH0731922A (en) 1995-02-03
EP0622492A2 (en) 1994-11-02
FI941864A0 (en) 1994-04-21
FI941864A (en) 1994-10-29
CA2122323A1 (en) 1994-10-29
EP0622492A3 (en) 1994-11-17
DE4313889C2 (en) 1994-08-25

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