EP0292471A2 - Squeegee apparatus with a ductor or a roller comprising a liquid substance feeding device - Google Patents

Squeegee apparatus with a ductor or a roller comprising a liquid substance feeding device Download PDF

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Publication number
EP0292471A2
EP0292471A2 EP88890126A EP88890126A EP0292471A2 EP 0292471 A2 EP0292471 A2 EP 0292471A2 EP 88890126 A EP88890126 A EP 88890126A EP 88890126 A EP88890126 A EP 88890126A EP 0292471 A2 EP0292471 A2 EP 0292471A2
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EP
European Patent Office
Prior art keywords
pressure chamber
substance
doctor blade
doctor
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88890126A
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German (de)
French (fr)
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EP0292471A3 (en
Inventor
Johannes Zimmer
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Individual
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Individual
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Publication of EP0292471A2 publication Critical patent/EP0292471A2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/40—Inking units
    • B41F15/42—Inking units comprising squeegees or doctors
    • 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
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • 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
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • 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

Definitions

  • the invention relates to a doctor or roller doctor device with a device for supplying a flowable substance.
  • Squeegee devices for applying flowable substances are either pre-poured the substances to be applied manually or by means of a pump through a pipe that runs along the application device and is provided with outlet openings.
  • a third supply option consists of a system of several supply pipe or hose lines distributed over the application width.
  • a pipe or hose orifice arranged in front of the doctor blade device and mechanically reciprocating parallel to it is a fourth feeding option which characterizes the current state of the art.
  • Feed pipes can have a uniform distribution of width regardless of viscosity and quantity, but with such a feed device there is a risk of streaking that becomes visible in the result of the application at a distance from the feed openings, for example due to air inclusions that occur when the incoming substance hits the in front of the doctoring device located substance can arise.
  • the substance supply located in front of the doctor device can have mountain-shaped and valley-shaped formations, which can also produce a streaky application result.
  • the invention presented herewith creates the novel possibility of a substance supply which is completely homogeneous and streak-free, regardless of viscosity, pressure and amount of the application substance.
  • this is achieved by a cavity running parallel or approximately parallel to the doctor blade device, which is designed as a pressure chamber, with at least one feed opening and an outlet area, which is preferably slit or slit-shaped and is shaped and dimensioned such that a relatively high through this outlet area Flow resistance can be generated, which enables the build-up of a relatively high, quasi hydrostatic pressure in the pressure chamber and, by means of uniformly acting pressure, causes the substance to flow out uniformly over the entire length of the device or doctor blade device or over the entire application width.
  • a device with a cavity in which a very high excess pressure is built up in relation to the amount flowing out and in relation to the length of the cavity.
  • This high overpressure is made possible by a narrow, preferably slot-shaped, at most outlet area divided by adjacent webs in flow channels of very small cross-section, which is dimensioned so narrow that it enables the build-up of a relatively high overpressure.
  • This overpressure described above causes uniform flow over the entire length of the device.
  • the exit area is preferably slot-shaped or slit-shaped, the webs which possibly exist in the gap area and cause channel formation have the double function of an exact dimensioning of the gap area, combined with an increase in the flow resistance counteracting the substance outlet.
  • a continuous slit in the pressure chamber itself can already provide the desired combination of high flow resistance and a sufficient amount of total applied application substance, provided the chamber walls have a corresponding thickness.
  • the invention can also be used in thin-walled pressure chambers without these having to be perforated in a sieve-like manner, which, with higher viscosity, could lead to the through-openings being blocked.
  • a metering rod is arranged in the interior of the pressure chamber, the outside of which, together with the inside of the pressure chamber, defines the inner section of the passage openings.
  • This metering rod is implemented as a tube wrapped in wire, the adjacent wire windings forming passage channels for the substance to be applied.
  • the above-described characteristic enables — this represents a further advantageous property — the arrangement of the outlet area of the feed device which distributes the width immediately before the application area.
  • the invention makes it possible to bring the exit area of the application substance to the application zone of the doctor device up to a distance of only a few mm.
  • the amount of substance in front of the doctor device can be kept to a minimum, which results in further functional advantages for the application process, such as improved application accuracy, minimization of the amount of substance remaining in front of the doctor blade after finishing work, avoidance of signs of aging in the substance supply, etc.
  • a delimitation bar - arranged in front of the exit area as viewed in the direction of movement - an exit area that is completely or at least approximately closed towards the outside can be formed.
  • This can also be seen as a shape of the width-distributing substance supply or outlet slit reaching as far as the surface to be applied or the round or flat template.
  • the front slot limitation seen in the direction of movement can also be brought up to the surface to be applied or the stencil to the rearward slot limitation seen in the direction of movement, and this can be made quasi touching, similar to or the same as a doctor blade.
  • the substance to be applied can be exposed to a dynamic pressure in the area between the substance outlet from the width-distributing feed device and the doctor bar if the space above the substance is closed and the cover is brought close to the application area.
  • FIGS. 2 and 3 show the section through the parts of two further exemplary embodiments essential to the invention.
  • FIG. 1 shows a doctor blade device which serves to coat a surface 11 with a flowable substance 1, the surface 11 being moved in the direction of the arrow 17 with respect to a coating doctor 8 which is intended to be stationary.
  • the doctor blade 8 is pressed by a magnetic bar 12 and presses the substance 1 onto the moving surface 11.
  • the doctor blade could also be moved over a fixed table 10 or the doctor blade and magnet could be together be moved.
  • the device for supplying flowable substance 1 is shown, which essentially consists of a pressure chamber 2. It should be expressly emphasized that this pressure chamber 2 could also be spaced apart from the respective doctor device, in deviation from the embodiments according to FIGS. 1 to 3.
  • the pressure chamber 2 has a front chamber wall 15 and a rear chamber wall 16, which are separated by a slot-shaped outlet opening which extends over the entire length of the pressure chamber 2.
  • the slot is set into individual curved ones around the metering rod 5 Channels continue, which form a functional unit with the slot in the pressure chamber 2. These channels are delimited by webs 6, which could be formed, for example, by the turns of a wire wound around the metering rod 5.
  • the contact of the metering rod 5 on the inner wall of the pressure chamber 2 is ensured by pressure screws 13.
  • the flowable substance supplied via at least one inlet opening 14 enters a cavity 3 in which there is a practically constant pressure, since a partial pressure drop over the length of the cavity 3, which disturbs the uniformity of distribution, with regard to the high flow resistance in those formed by the webs 6 Channels cannot occur.
  • the rear chamber wall 16 is connected to the doctor blade 8 in such a way that it defines a front storage space for the substance 1.
  • the embodiment according to FIG. 2 is different in that a magnetically pressed doctor blade 7 replaces the doctor blade 8 and the front chamber wall 15 further limits the liquid supply to the front.
  • FIG. 3 shows a combination of the measures according to FIGS. 1 and 2, by means of which the liquid supply is reduced to the lowest possible extent.
  • the pressure with which the liquid is pressed into the base is also essentially determined by the mechanical or magnetic pressure of the doctor device in this embodiment.
  • the dynamic pressure which arises in the wedge gap between the doctor blade and the moving surface 11 should not be confused with the pressure which exists in the cavity 3.
  • a sealing lamella 9 prevents the substance 1 from escaping to the front.
  • the invention permits a large number of constructive variants, in particular also as regards the supply of substance 1 to cavity 3.

Abstract

The apparatus has a pressure chamber (2), running parallel to the ductor, in the inner space of which the substance is held under increased pressure and from which it emerges through exit apertures (4) which extend over the greater part of the length of the pressure chamber (2). <IMAGE>

Description

Die Erfindung bezieht sich auf ein Streich- oder Roll­rakelgerät mit einer Einrichtung zur Zuführung einer fließfähigen Substanz.The invention relates to a doctor or roller doctor device with a device for supplying a flowable substance.

Rakelgeräten zum Auftragen fließfähiger Substanzen werden die aufzutragenden Substanzen entweder von Hand aus vorgeschüttet oder durch ein Rohr, das entlang der Auftragsvorrichtung verläuft und mit Austritts­öffnungen versehen ist, mittels einer Pumpe zugeführt. Eine dritte Zuführmöglichkeit besteht aus einem System mehrerer über die Auftragungsbreite verteilt ange­ordneter Zuführungs-Rohr- oder Schlauch-Leitungen. Eine vor dem Rakelgerät angeordnete und parallel zu diesem mechanisch hin- und herbewegten Rohr- oder Schlauchmündung ist eine vierte, den derzeitigen Stand der Technik kennzeichnende Zuführungsmöglichkeit.Squeegee devices for applying flowable substances are either pre-poured the substances to be applied manually or by means of a pump through a pipe that runs along the application device and is provided with outlet openings. A third supply option consists of a system of several supply pipe or hose lines distributed over the application width. A pipe or hose orifice arranged in front of the doctor blade device and mechanically reciprocating parallel to it is a fourth feeding option which characterizes the current state of the art.

Vorbeschriebener Stand der Technik ist mit folgenden Nachteilen behaftet: bei Zuführung durch ein mit mehreren in Abständen angeordneten Austrittsöffnungen versehenes Rohr, entsteht in diesem Rohr ein mengen- ­bzw. viskositätsabhängiger Druckabfall. Durch diesen Druckabfall bedingt, entsteht die Gefahr einer ungleich­mäßigen Substanzverteilung vor dem Rakelgerät. Dieser Gefahr kann nur begegnet werden, in dem ein dynamisches Gleichgewicht zwischen einem bestimmten Rohrquerschnitt, einer bestimmten Rohrlänge, einer bestimmten Zuführungs­menge, einem bestimmten Zuführungsdruck und einer bestimmten Anordnung und Dimensionierung der Austritts­öffnungen hergestellt wird. Veränderung der Menge, der Viskosität oder des Druckes bewirkt Ungleichmäßigwerden der Breitenverteilung.The above-described prior art has the following disadvantages: if it is fed through a pipe provided with a plurality of outlet openings arranged at intervals, a quantity or viscosity-dependent pressure drop. Due to this drop in pressure, there is a risk of an uneven distribution of substance in front of the doctor device. This danger can only be countered by establishing a dynamic balance between a certain pipe cross-section, a certain pipe length, a certain supply quantity, a certain supply pressure and a certain arrangement and dimensioning of the outlet openings. Changing the amount, viscosity or pressure causes the width distribution to become uneven.

Bei Verwendung mehrerer über die Länge des Rakelgerätes bzw. über die Auftragungsbreite verteilt angeordneten Zuführungsrohre kann zwar eine von Viskosität und Menge unabhängige Breitenverteilungs-Gleichmäßigkeit erzielt werden, jedoch besteht bei einer solchen Zuführungsein­richtung die Gefahr einer im Abstand der Zuführungs­öffnungen im Auftragungsergebnis sichtbar werdenden Streifigkeit, z.B. bedingt durch Lufteinschlüsse, die beim Auftreffen der zulaufenden Substanz auf die vor dem Rakelgerät befindliche Substanz entstehen können. Bei schlecht fließfähigen Substanzen kann der vor dem Rakelgerät befindliche Substanzvorrat berg- und tal­förmige Ausformungen erhalten, die ebenfalls auch ein streifiges Auftragungsergebnis bewirken können.When using several arranged over the length of the squeegee or across the application width Feed pipes can have a uniform distribution of width regardless of viscosity and quantity, but with such a feed device there is a risk of streaking that becomes visible in the result of the application at a distance from the feed openings, for example due to air inclusions that occur when the incoming substance hits the in front of the doctoring device located substance can arise. In the case of poorly flowable substances, the substance supply located in front of the doctor device can have mountain-shaped and valley-shaped formations, which can also produce a streaky application result.

Die Zuführung mittels eines entlang dem Rakelgerät quer hin- und herbewegten Schlauches oder Rohres erfordert hohen zusätzlichen Kostenaufwand und ist außerdem aufgrund eines zu hohen Raumbedarfes bei manchen Rakelgeräten - so z.B. im Rundschablonendruck - ­wegen Raummangel nicht anwendbar.The supply by means of a hose or tube which is moved back and forth along the doctor device requires high additional costs and is also due to the excessive space requirement for some doctor devices - e.g. in round stencil printing - not applicable due to lack of space.

Die hiermit vorgelegte Erfindung schafft die neuartige Möglichkeit einer unabhängig von Viskosität, Druck und Menge der Auftragungssubstanz streifenfrei völlig homogen erfolgenden Substanzzuführung. Erfindungsgemäß wird dies erreicht durch einen parallel oder annähernd parallel zum Rakelgerät verlaufenden Hohlraum, der als Druckkammer ausgebildet ist, mit mindestens einer Zuführungsöffnung und einem Austrittsbereich, der vorzugsweise schlitz- oder spaltförmig beschaffen und so ausgeformt und dimensioniert ist, daß durch diesen Austrittsbereich ein relativ hoher Strömungs­widerstand erzeugt werden kann, der den Aufbau eines relativ hohen, quasi hydrostatischen Druckes in der Druckkammer ermöglicht und durch gleichmäßig wirkenden Druck ein über die gesamte Länge der Einrichtung bzw. des Rakelgerätes bzw. über die gesamte Auftragsbreite gleichmäßiges Ausfließen der Substanz bewirkt.The invention presented herewith creates the novel possibility of a substance supply which is completely homogeneous and streak-free, regardless of viscosity, pressure and amount of the application substance. According to the invention, this is achieved by a cavity running parallel or approximately parallel to the doctor blade device, which is designed as a pressure chamber, with at least one feed opening and an outlet area, which is preferably slit or slit-shaped and is shaped and dimensioned such that a relatively high through this outlet area Flow resistance can be generated, which enables the build-up of a relatively high, quasi hydrostatic pressure in the pressure chamber and, by means of uniformly acting pressure, causes the substance to flow out uniformly over the entire length of the device or doctor blade device or over the entire application width.

Erfindungsgemäß wird eine Vorrichtung mit einem Hohlraum vorgestellt, in welchem ein im Verhältnis zur aus­fließenden Menge und im Verhältnis zur Länge des Hohl­raumes sehr hoher Überdruck aufgebaut wird. Dieser hohe Überdruck wird ermöglicht durch einen schmalen, vorzugs­weise schlitzförmigen, allenfalls durch Stege in neben­einanderliegend angeordnete Strömungskanäle sehr kleinen Querschnittes aufgeteilten Austrittsbereich, der so eng dimensioniert ist, daß dadurch der Aufbau eines relativ hohen Überdruckes ermöglicht wird. Durch diesen vorbeschriebenen Überdruck wird gleichmäßiges Ausfließen über die gesamte Länge der Vorrichtung bewirkt.According to the invention, a device with a cavity is presented in which a very high excess pressure is built up in relation to the amount flowing out and in relation to the length of the cavity. This high overpressure is made possible by a narrow, preferably slot-shaped, at most outlet area divided by adjacent webs in flow channels of very small cross-section, which is dimensioned so narrow that it enables the build-up of a relatively high overpressure. This overpressure described above causes uniform flow over the entire length of the device.

Der Auftragungsprozeß kann dadurch in qualitativer Hinsicht verbessert werden.This can improve the application process in terms of quality.

Der Austrittsbereich ist vorzugsweise schlitz- oder spaltförmig ausgebildet, die im Spaltbereich allenfalls vorhandenen, eine Kanalbildung bewirkenden Stege haben die Doppelfunktion einer exakten Dimensionierung des Spaltbereiches, verbunden mit einer Vergrößerung des dem Substanzaustritt entgegenwirkenden Strömungs­widerstandes.The exit area is preferably slot-shaped or slit-shaped, the webs which possibly exist in the gap area and cause channel formation have the double function of an exact dimensioning of the gap area, combined with an increase in the flow resistance counteracting the substance outlet.

Ein durchgehender Schlitz in der Druckkammer selbst kann bei entsprechender Dicke der Kammerwände bereits die gewünschte Kombination von hohem Strömungswiderstand und hinreichender Menge an insgesamt geförderter Auftragungssubstanz liefern. Die Erfindung ist jedoch auch bei dünnwandigen Druckkammern anwendbar, ohne daß diese siebartig durchbohrt werden müssen, was bei höherer Viskosität zur Verstopfung der Durchgangs­öffnungen führen könnte. Zu diesem Zweck wird im Inneren der Druckkammer ein Dosierstab angeordnet, dessen Außenseite zusammen mit der Innenseite der Druckkammer den inneren Abschnitt der Durchtritts­öffnungen definiert. In der einfachsten konstruktiven Durchführung ist dieser Dosierstab ein mit Draht umwickeltes Rohr, wobei die aneinanderliegenden Draht­wicklungen Durchtrittskanäle für die Auftragssubstanz bilden.A continuous slit in the pressure chamber itself can already provide the desired combination of high flow resistance and a sufficient amount of total applied application substance, provided the chamber walls have a corresponding thickness. However, the invention can also be used in thin-walled pressure chambers without these having to be perforated in a sieve-like manner, which, with higher viscosity, could lead to the through-openings being blocked. For this purpose, a metering rod is arranged in the interior of the pressure chamber, the outside of which, together with the inside of the pressure chamber, defines the inner section of the passage openings. In the simplest constructive This metering rod is implemented as a tube wrapped in wire, the adjacent wire windings forming passage channels for the substance to be applied.

Die vorbeschriebene Charakteristik ermöglicht - es stellt dies eine weitere vorteilhafte Eigenschaft dar - ­die Anordnung des Austrittsbereiches der breitenver­teilend erfolgenden Zuführungseinrichtung unmittelbar vor dem Auftragungsbereich. Die Erfindung ermöglicht es, den Austrittsbereich der Auftragungssubstanz bis auf eine Entfernung von nur mehr wenigen mm an die Auftragungszone der Rakeleinrichtung heranzuführen. Diesem Konstruktionsgedanken folgend, kann die Substanz­menge vor dem Rakelgerät minimal gehalten werden, woraus weitere Funktionsvorteile für den Auftragungsvorgang entstehen, wie z.B. verbesserte Auftragungsgenauigkeit, Minimierung der nach Arbeitsbeendigung vor dem Rakel­gerät verbleibenden Substanzvorratsmenge, Vermeidung von Alterungserscheinungen im Substanzvorrat usw.The above-described characteristic enables — this represents a further advantageous property — the arrangement of the outlet area of the feed device which distributes the width immediately before the application area. The invention makes it possible to bring the exit area of the application substance to the application zone of the doctor device up to a distance of only a few mm. Following this design concept, the amount of substance in front of the doctor device can be kept to a minimum, which results in further functional advantages for the application process, such as improved application accuracy, minimization of the amount of substance remaining in front of the doctor blade after finishing work, avoidance of signs of aging in the substance supply, etc.

Diese vorteilhaften Ausgestaltungsmöglichkeiten weiter fortsetzend, kann durch Hinzufügung einer Begrenzungs­leiste - in Bewegungsrichtung gesehen vor dem Austritts­bereich angeordnet - ein nach außen hin zur Gänze oder zumindest annähernd geschlossener Austrittsbereich gebildet werden. Es kann dies auch gesehen werden als Ausformung der breitenverteilend erfolgenden Substanz­zuführungs- bzw. Austritts-Schlitzes bis an die zu beauftragende Fläche bzw. Rund- oder Flachschablone heranreichend.Continuing these advantageous configuration options, by adding a delimitation bar - arranged in front of the exit area as viewed in the direction of movement - an exit area that is completely or at least approximately closed towards the outside can be formed. This can also be seen as a shape of the width-distributing substance supply or outlet slit reaching as far as the surface to be applied or the round or flat template.

Ebenso wie vorstehend beschrieben die in Bewegungs­richtung gesehen vordere Schlitzbegrenzung kann auch die in Bewegungsrichtung gesehen rückwärtige Schlitz­begrenzung bis an die zu beauftragende Fläche bzw. an die Schablone herangeführt und diese quasi berührend, ähnlich oder gleich einer Rakel ausgebildet werden.Just as described above, the front slot limitation seen in the direction of movement can also be brought up to the surface to be applied or the stencil to the rearward slot limitation seen in the direction of movement, and this can be made quasi touching, similar to or the same as a doctor blade.

Die aufzutragende Substanz kann in dem Bereich zwischen Substanzaustritt aus der breitenverteilenden Zuführungs­einrichtung und Rakelleiste einem Staudruck ausgesetzt werden, wenn der oberhalb der Substanz befindliche Raum geschlossen und die Abdeckung nahe an den Auftragungs­bereich herangeführt wird.The substance to be applied can be exposed to a dynamic pressure in the area between the substance outlet from the width-distributing feed device and the doctor bar if the space above the substance is closed and the cover is brought close to the application area.

Anschließend werden einige Ausführungsbeispiele der Erfindung anhand der Zeichnung dargestellt und erklärt.Then some embodiments of the invention are illustrated and explained with reference to the drawing.

In dieser zeigt Fig. 1 ein erstes Ausführungsbeispiel im Schnitt, Fig. 2 und 3 den Schnitt durch die erfindungswesentlichen Teile von zwei weiteren Aus­führungsbeispielen.1 shows a first exemplary embodiment in section, FIGS. 2 and 3 show the section through the parts of two further exemplary embodiments essential to the invention.

In Fig. 1 ist ein Streichrakelgerät dargestellt, welches dazu dient, eine Fläche 11 mit einer fließ­fähigen Substanz 1 zu beschichten, wobei die Fläche 11 in Richtung des Pfeiles 17 gegenüber einer stillstehend gedachten Streichrakel 8 bewegt ist. Die Streichrakel 8 wird von einem Magnetbalken 12 angepreßt und drückt die Substanz 1 auf die bewegte Fläche 11. Anstatt die Waren­bahn, welche die Fläche 11 aufweist, zu bewegen, könnte auch die Streichrakel über einen feststehenden Tisch 10 bewegt werden oder Streichrakel und Magnet könnten zusammen verschoben werden. In Verbindung mit der Streichrakel 8 ist die Einrichtung zur Zuführung fließ­fähiger Substanz 1 gezeigt, welche im wesentlichen aus einer Druckkammer 2 besteht. Es sei ausdrücklich betont, daß diese Druckkammer 2 abweichend von den Ausführungen nach Fig. 1 bis 3 auch von der jeweiligen Rakelein­richtung distanziert sein könnte. Die Druckkammer 2 weist eine vordere Kammerwand 15 und eine hintere Kammerwand 16 auf, welche durch eine schlitzförmige, sich über die ganze Länge der Druckkammer 2 erstreckende Austrittsöffnung getrennt sind. Der Schlitz setzt sich in einzelne, um den Dosierstab 5 verlaufende gekrümmte Kanäle fort, welche mit dem Schlitz in der Druckkammer 2 eine funktionelle Einheit bilden. Diese Kanäle werden durch Stege 6 begrenzt, die beispielsweise durch die Windungen eines um den Dosierstab 5 gewickelten Drahtes gebildet sein könnten. Das Anliegen des Dosierstabes 5 an der Innenwand der Druckkammer 2 wird durch Anpreß­schrauben 13 sichergestellt.1 shows a doctor blade device which serves to coat a surface 11 with a flowable substance 1, the surface 11 being moved in the direction of the arrow 17 with respect to a coating doctor 8 which is intended to be stationary. The doctor blade 8 is pressed by a magnetic bar 12 and presses the substance 1 onto the moving surface 11. Instead of moving the web having the surface 11, the doctor blade could also be moved over a fixed table 10 or the doctor blade and magnet could be together be moved. In connection with the doctor blade 8, the device for supplying flowable substance 1 is shown, which essentially consists of a pressure chamber 2. It should be expressly emphasized that this pressure chamber 2 could also be spaced apart from the respective doctor device, in deviation from the embodiments according to FIGS. 1 to 3. The pressure chamber 2 has a front chamber wall 15 and a rear chamber wall 16, which are separated by a slot-shaped outlet opening which extends over the entire length of the pressure chamber 2. The slot is set into individual curved ones around the metering rod 5 Channels continue, which form a functional unit with the slot in the pressure chamber 2. These channels are delimited by webs 6, which could be formed, for example, by the turns of a wire wound around the metering rod 5. The contact of the metering rod 5 on the inner wall of the pressure chamber 2 is ensured by pressure screws 13.

Die über mindestens eine Eintrittsöffnung 14 zugeführte fließfähige Substanz gelangt erfindungsgemäß in einen Hohlraum 3, in welchem ein praktisch konstanter Druck herrscht, da ein die Verteilungsgleichmäßigkeit störender partieller Druckabfall über die Länge des Hohlraumes 3 im Hinblick auf den hohen Strömungswider­stand in den durch die Stege 6 gebildeten Kanälen nicht auftreten kann.
Im Ausführungsbeispiel nach Fig. 1 ist die hintere Kammerwand 16 derart mit der Streichrakel 8 verbunden, daß sie einen vorderen Stauraum für die Substanz 1 definiert. Das Ausführungsbeispiel nach Fig. 2 ist insofern unterschiedlich, als dort eine magnetisch angepreßte Rollrakel 7 die Streichrakel 8 ersetzt und überdies durch die vordere Kammerwand 15 der Flüssig­keitsvorrat nach vorne begrenzt wird.According to the invention, the flowable substance supplied via at least one inlet opening 14 enters a cavity 3 in which there is a practically constant pressure, since a partial pressure drop over the length of the cavity 3, which disturbs the uniformity of distribution, with regard to the high flow resistance in those formed by the webs 6 Channels cannot occur.
In the exemplary embodiment according to FIG. 1, the rear chamber wall 16 is connected to the doctor blade 8 in such a way that it defines a front storage space for the substance 1. The embodiment according to FIG. 2 is different in that a magnetically pressed doctor blade 7 replaces the doctor blade 8 and the front chamber wall 15 further limits the liquid supply to the front.

Fig. 3 zeigt eine Kombination der Maßnahmen nach Fig. 1 und 2, durch welche der Flüssigkeitsvorrat auf das geringstmögliche Ausmaß verkleinert ist. Der Druck, mit welchem die Flüssigkeit in die Unterlage gepreßt wird, ist auch bei dieser Ausführung wesentlich durch die mechanische oder magnetische Anpressung des Rakel­gerätes bestimmt. Der Staudruck, welcher im Keilspalt zwischen der Streichrakel und der bewegten Fläche 11 entsteht, ist nicht zu verwechseln mit dem Druck, welcher im Hohlraum 3 besteht. Den Austritt der Substanz 1 nach vorne verhindert dabei eine Dichtlamelle 9.FIG. 3 shows a combination of the measures according to FIGS. 1 and 2, by means of which the liquid supply is reduced to the lowest possible extent. The pressure with which the liquid is pressed into the base is also essentially determined by the mechanical or magnetic pressure of the doctor device in this embodiment. The dynamic pressure which arises in the wedge gap between the doctor blade and the moving surface 11 should not be confused with the pressure which exists in the cavity 3. A sealing lamella 9 prevents the substance 1 from escaping to the front.

Die Erfindung läßt eine große Zahl konstruktiver Varianten zu, insbesondere auch was die Zuführung der Substanz 1 zum Hohlraum 3 betrifft.The invention permits a large number of constructive variants, in particular also as regards the supply of substance 1 to cavity 3.

Um bei der dargestellten Einrichtung die Durchflußmenge zu erhöhen oder eine erhöhte Viskosität auszugleichen, genügt es an sich, den Druck im Hohlraum 3 der Druck­kammer 2 zu erhöhen. Alternativ oder ergänzend hiezu ist es jedoch auch möglich, den Dosierstab 5 gegen einen anderen Stab mit geändertem Durchmesser oder anderer Bewicklung auszutauschen.In order to increase the flow rate in the device shown or to compensate for an increased viscosity, it is sufficient in itself to increase the pressure in the cavity 3 of the pressure chamber 2. Alternatively or in addition to this, however, it is also possible to replace the metering rod 5 with another rod with a different diameter or with different wrapping.

Claims (11)

1. Streich- oder Rollrakelgerät mit einer Einrichtung zur Zuführung einer fließfähigen Substanz, gekenn­zeichnet durch einen parallel oder annähernd parallel zum Rakelgerät verlaufenden Hohlraum, der als Druck­kammer ausgebildet ist, mit mindestens einer Zuführungsöffnung und einem Austrittsbereich, der vorzugsweise schlitz- oder spaltförmig beschaffen und so ausgeformt und dimensioniert ist, daß durch diesen Austrittsbereich ein relativ hoher Strömungs­widerstand erzeugt werden kann, der den Aufbau eines relativ hohen, quasi hydrostatischen Druckes in der Druckkammer ermöglicht und durch gleichmäßig wirkenden Druck ein über die gesamte Länge der Einrichtung bzw. des Rakelgerätes bzw. über die gesamte Auftragsbreite gleichmäßiges Ausfließen der Substanz bewirkt.1. coating or roller doctor device with a device for supplying a flowable substance, characterized by a parallel or approximately parallel to the doctor device cavity, which is designed as a pressure chamber, with at least one feed opening and an outlet area, which preferably procure slot or gap-shaped and so is shaped and dimensioned that a relatively high flow resistance can be generated by this outlet area, which enables the build-up of a relatively high, quasi hydrostatic pressure in the pressure chamber and by uniformly acting pressure over the entire length of the device or the doctor device or over the entire application width causes the substance to flow out evenly. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Austrittsbereich (4) sich ununterbrochen über die ganze Länge der Druckkammer (2) erstreckt.2. Device according to claim 1, characterized in that the outlet region (4) extends continuously over the entire length of the pressure chamber (2). 3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Austrittsbereich (4) durch Stege (6) in dicht aneinanderliegende enge Kanäle unterteilt ist.3. Device according to claim 2, characterized in that the outlet region (4) by webs (6) is divided into closely spaced narrow channels. 4. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß zur Ausbildung von Kanälen mit hohem Durchfluß­widerstand ein Dosierstab (5) mit annähernd in Umfangsrichtung verlaufenden Stegen (6) in der Druck­kammer (2) angeordnet ist.4. Device according to claim 2, characterized in that a metering rod (5) with approximately circumferentially extending webs (6) in the pressure chamber (2) is arranged to form channels with high flow resistance. 5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Stege (6) durch die Windungen eines Drahtes gebildet sind, der um den Dosierstab (5) gewickelt ist.5. Device according to claim 4, characterized in that the webs (6) are formed by the turns of a wire which is wound around the metering rod (5). 6. Einrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die hintere Wand (16) der Druck­kammer (2) als Streichrakel ausgebildet ist (Fig. 3) oder eine gesonderte Streichrakel (8) trägt (Fig. 1).6. Device according to one of claims 1 to 5, characterized in that the rear wall (16) of the pressure chamber (2) is designed as a doctor blade (Fig. 3) or carries a separate doctor blade (8) (Fig. 1). 7. Einrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die vordere Wand (15) der Druck­kammer (2) bis an die mit der Substanz (1) zu beauf­tragende Fläche (11) heranreicht und gegebenenfalls dichtend daran anliegt (Fig. 2,3).7. Device according to one of claims 1 to 6, characterized in that the front wall (15) of the pressure chamber (2) up to the surface to be applied with the substance (1) (11) and optionally sealingly abuts against it (Fig. 2,3). 8. Einrichtung, insbesondere nach Anspruch 7, dadurch gekennzeichnet, daß die Distanz zwischen vorderer Wand (15) und mit der Substanz (1) zu beauftragender Fläche (11) durch eine Dichtlamelle (9) überbrückt ist.8. Device, in particular according to claim 7, characterized in that the distance between the front wall (15) and with the substance (1) to be applied surface (11) is bridged by a sealing lamella (9). 9. Einrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß sowohl die vordere Wand (15) wie die hintere Wand (16) der Druckkammer (2) bis zur zu beauftragenden Fläche (11) heranreichen oder verlängert sind, wobei das Ende der Austrittsöffnung (4) mit der Auftragungszone zusammenfällt und die Einrichtung als Auftragungsgerät wirkt (Fig. 3).9. Device according to one of claims 1 to 8, characterized in that both the front wall (15) and the rear wall (16) of the pressure chamber (2) up to the surface to be applied (11) are extended or extended, the end the outlet opening (4) coincides with the application zone and the device acts as an application device (FIG. 3). 10. Einrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Streichrakel (8) bzw. die Rollrakel (7) magnetisch angepreßt ist.10. Device according to one of claims 1 to 9, characterized in that the doctor blade (8) or the doctor blade (7) is magnetically pressed. 11. Einrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß sie um die Berührungs­linie von Rakel (7,8) und zu beauftragender Fläche (11) schwenkbar ist.11. Device according to one of claims 1 to 10, characterized in that it is pivotable about the line of contact of the doctor blade (7, 8) and the surface to be applied (11).
EP88890126A 1987-05-18 1988-05-18 Squeegee apparatus with a ductor or a roller comprising a liquid substance feeding device Withdrawn EP0292471A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT125787A AT387161B (en) 1987-05-18 1987-05-18 DEVICE FOR SUPPLYING A FLOWABLE SUBSTANCE
AT1257/87 1987-05-18

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EP0292471A2 true EP0292471A2 (en) 1988-11-23
EP0292471A3 EP0292471A3 (en) 1990-04-18

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EP88890126A Withdrawn EP0292471A3 (en) 1987-05-18 1988-05-18 Squeegee apparatus with a ductor or a roller comprising a liquid substance feeding device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115090488A (en) * 2022-07-10 2022-09-23 江苏奥力新材料股份有限公司 Vehicle sticker gum smearing process and gum recovery device thereof

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US2726632A (en) * 1952-03-31 1955-12-13 Sherwin Williams Co Applicator for highly viscous liquids
US2928340A (en) * 1957-03-21 1960-03-15 Stein Textile printing machine
DE1811124A1 (en) * 1967-11-28 1969-07-17 Eastman Kodak Co Slot caster
FR2129727A5 (en) * 1971-03-16 1972-10-27 Stork Amsterdam
US3921521A (en) * 1970-07-23 1975-11-25 Zimmer Peter Squeegee device
EP0056067A1 (en) * 1981-01-14 1982-07-21 Bolton-Emerson, Inc. Apparatus for applying a thin layer of a coating substance to a travelling material web
DE3335252A1 (en) * 1982-10-07 1984-04-12 Zimmer, Johannes, 9020 Klagenfurt, Kärnten Device for the uniform or regular distribution of flowable media in a predetermined width

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2726632A (en) * 1952-03-31 1955-12-13 Sherwin Williams Co Applicator for highly viscous liquids
US2928340A (en) * 1957-03-21 1960-03-15 Stein Textile printing machine
DE1811124A1 (en) * 1967-11-28 1969-07-17 Eastman Kodak Co Slot caster
US3921521A (en) * 1970-07-23 1975-11-25 Zimmer Peter Squeegee device
FR2129727A5 (en) * 1971-03-16 1972-10-27 Stork Amsterdam
EP0056067A1 (en) * 1981-01-14 1982-07-21 Bolton-Emerson, Inc. Apparatus for applying a thin layer of a coating substance to a travelling material web
DE3335252A1 (en) * 1982-10-07 1984-04-12 Zimmer, Johannes, 9020 Klagenfurt, Kärnten Device for the uniform or regular distribution of flowable media in a predetermined width

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115090488A (en) * 2022-07-10 2022-09-23 江苏奥力新材料股份有限公司 Vehicle sticker gum smearing process and gum recovery device thereof

Also Published As

Publication number Publication date
EP0292471A3 (en) 1990-04-18
AT387161B (en) 1988-12-12
ATA125787A (en) 1988-05-15

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