EP0771377A1 - Painting edge limiter for a painting arrangement with a short residence time - Google Patents

Painting edge limiter for a painting arrangement with a short residence time

Info

Publication number
EP0771377A1
EP0771377A1 EP95943513A EP95943513A EP0771377A1 EP 0771377 A1 EP0771377 A1 EP 0771377A1 EP 95943513 A EP95943513 A EP 95943513A EP 95943513 A EP95943513 A EP 95943513A EP 0771377 A1 EP0771377 A1 EP 0771377A1
Authority
EP
European Patent Office
Prior art keywords
web
sealing block
format
painting
coating
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.)
Granted
Application number
EP95943513A
Other languages
German (de)
French (fr)
Other versions
EP0771377B1 (en
Inventor
Wolfgang Isfort
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.)
Stora Publication Paper AG
Original Assignee
Stora Feldmuehle 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 Stora Feldmuehle AG filed Critical Stora Feldmuehle AG
Publication of EP0771377A1 publication Critical patent/EP0771377A1/en
Application granted granted Critical
Publication of EP0771377B1 publication Critical patent/EP0771377B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters
    • D21H23/36—Knife or blade forming part of the fluid reservoir, e.g. puddle-type trailing blade or short-dwell coaters
    • 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
    • B05C11/047—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 provided with end dams
    • 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

Definitions

  • the invention relates to a coating edge limiter for a short dwell coating device according to the preamble of claim 1.
  • a short dwell coating device has become known from US Pat. No. 4,250,211.
  • Stroke limiters of the aforementioned type are well known; They are mainly used as a sealing element at the two roller ends in order to prevent the coating slip from escaping from the coating chamber as it flows out laterally.
  • An end seal for a short dwell coating device of the type described in the preamble of claim 1 is already known from DE 38 15 764 AI.
  • the upper outer surface of the end seal directed against the paper web has cavities through which water is introduced between said outer surface and the material web in order to achieve the tightness improve and reduce the wear of the end seal.
  • a disadvantage of the known design is that the coating slip diluted by the introduced water leaves less coating slip on the edges of the material web, so that a transition area with a falling coat weight is created.
  • An edge trim must be correspondingly wide, because the machine operator cannot visually see exactly where the web has its required coating weight.
  • the water supply also causes the dry web edges to be moistened. In the case of lightweight paper webs in particular, this causes the web edges to flutter. The running properties of the web deteriorate up to the web break. With this known end seal, it is not possible to obtain a clean web edge free of coating slip.
  • the object of the invention is to provide coating edge limiters with which sharply delimited web edges that are completely free of coating slip can be reached, whereby contamination of the coating edge limiter by incrusted coating slip should be avoided.
  • the invention provides a combination of features a) to d) in the case of a delimiter according to the preamble of claim 1.
  • Preferred Embodiments are specified in subclaims 2 to 5.
  • the sheet metal firmly connected to the coating edge delimiter completely covers the application zone in the edge area of the web.
  • the water continuously supplied in the sealing gap between the format plate and the sealing block forms a pressure cushion which prevents the coating compound under pressure in the coating chamber from flowing out from the side and ensures that the format plate is pressed flat against the web.
  • no coating slip can be applied to the web where the format sheet covers the web.
  • the format sheet preferably made of spring steel, a few tenths of a mm, preferably ⁇ 0.4 mm, thickly adapts to the curved contour of the counter-roller.
  • the application zone is covered until just before the doctor element.
  • the sealing block which is advantageously overlapped by 5 to 20% of the format sheet, has a simple contour, which does not have to be exactly adapted to a more or less strongly curved doctor element.
  • the spreading of coating slip prevents this in the sealing gap pressure pads built up by supplying water. Since the surface of the format plate remains at rest, in contrast to the moving surface of the web, the flow speed of the coating slip decreases considerably there. Mixing of the coating slip with the supplied water takes place only to a small extent. As a side effect, the permanent drainage of water from the sealing gap prevents annoying paint deposits, so that the coating edge limiter keeps itself clean.
  • the sealing block is made of metal, in particular stainless steel. Due to the good thermal conductivity of metals, condensate forms on the surface of the sealing block, which is relatively cold due to the permanently flowing cold water, so that no coating slip can be deposited here.
  • the area on the squeegee element in previously known plastic or rubber seals is particularly at risk from coating slip deposits, since there it is not possible for the seal or the sealing block to lie completely against the squeegee element for different high pressure forces, with the result of different curvature of the squeegee element.
  • a water spray device uses a fine water jet to wet the surface of the sheet metal that faces the web especially with abrasive base paper to lubricate the surfaces rubbing against each other and thus to minimize wear of the format plate.
  • the amount of water required for this is so small that there were no negative effects on the edge of the web. This means that the service life of the sheet metal can be extended from hours to several weeks.
  • the format plate can be replaced in a short time using a clamping device, without requiring any special adjustment work on the coating edge limiter.
  • FIG. 2 shows a top view of the streak edge delimiter arranged in the coating device on the right-hand side.
  • a coating (not shown) is formed, into which coating material is fed under pressure.
  • the doctor element (3) is supported on the part (18).
  • the application weight is in the order of 5 to 16 g / m 2 and is largely determined by the pressure force of the doctor element (3). Excess coating is spread over the dam wall
  • each sealing block (5) there are three recesses (11) in the form of a milled opening that is open in the area of the storage wall (4) and ends in front of the doctor element (3).
  • the depressions (11) are each connected via a channel (13) via a centrally arranged water supply (20) in the sealing block (5).
  • the water supplied through the channels (13) forms a pressure cushion in the recesses (11), which ensures that the format plate (8) is pressed against the web (2) and reliably prevents the coating compound under pressure in the coating chamber from passing through the approx. 1.5 mm wide Sealing gap (15) can flow out.
  • the water consumption of the coating edge limiter is approx. 2 to 5 liters per minute and is negligible compared to a paint throughput of up to 1,000 liters per minute, so that no special precautions for water drainage are necessary.
  • the water flowing out of the side of the coating edge limiter is drained off together with the excess coating material.
  • the format plate (8) is attached to the format plate holder (7) with the clamping device (19).
  • the sheet metal holder (7) is in turn firmly connected to the sealing block (5) and projects outward beyond the storage wall (4) without touching it.
  • a water spray device (9) is arranged at the outer end of the sheet metal holder (7).
  • a fine water jet (16) is sprayed onto the format plate (8) through the needle nozzle (10), which has a diameter of 0.5 mm, at a pressure of approximately 0.5 to 1 bar.
  • the coating edge limiter is arranged as a unit which can be moved transversely to the web running direction.

Landscapes

  • Coating Apparatus (AREA)
  • Materials For Medical Uses (AREA)
  • Paper (AREA)
  • Color Printing (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Supports For Plants (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Packages (AREA)

Abstract

The invention concerns a painting edge limiter for a painting arrangement with a short residence time for coating continuous material (2), in particular paper. This edge limiter seals laterally at both ends a coating slip chamber which is formed between the barrier wall (4) and doctor blade element (3). The application zone (2) which builds up on the paper web is thus covered flat at each edge by the formatting plate (8) of the painting edge limiter. The formatting plate holder (7) is rigidly connected to the sealing block (5) and projects outwards over the barrier wall (4). On the side remote from the formatting plate (8), the sealing block (5) has at least one depression (11) which is connected to a water supply (20) by a channel (13). A narrow sealing gap (15), 1 to 3 mm wide, is formed between the formatting plate (8) and the sealing block (5). The water introduced through the depression (11) into the sealing gap (15) generates a pressure pad and urges the formatting sheet (8) flat against the paper web.

Description

Streichrandbegrenzer für eine Kurzverweilzeit-Streicheinrichtung Scraper limiters for a short dwell coating facility
Die Erfindung betrifft einen Streichrandbegrenzer für eine Kurzverweilzeit-Streicheinrichtung entsprechend dem Oberbegriff des Patentanspruches 1. Eine Kurzverweilzeit-Streicheinrichtung ist durch die US-PS 4,250,211 bekanntgeworden.The invention relates to a coating edge limiter for a short dwell coating device according to the preamble of claim 1. A short dwell coating device has become known from US Pat. No. 4,250,211.
Streichrandbegrenzer der vorgenannten Art sind hinlänglich bekannt; sie werden hauptsächlich als Dichtelement an den beiden Walzenenden eingesetzt, um zu verhindern, daß die Streichmasse durch seitliches Ausfließen aus der Beschichtungskaπurter entweicht.Stroke limiters of the aforementioned type are well known; They are mainly used as a sealing element at the two roller ends in order to prevent the coating slip from escaping from the coating chamber as it flows out laterally.
Es ist bereits eine Endabdichtung für eine Kurzverweilzeit-Streicheinrichtung der im Oberbegriff des Patentanspruches 1 beschriebenen Art aus DE 38 15 764 AI bekannt. Die obere gegen die Papierbahn gerichtete Außenfläche dieser Endabdichtung weist Hohlräume auf, durch die Wasser zwischen besagter Außenfläche und die Materialbahn eingeführt wird, um die Dichtheit zu verbessern und den Verschleiß der Endabdichtung zu reduzieren. Ein Nachteil der bekannten Ausführung besteht darin, daß die durch das eingeführte Wasser verdünnte Streichmasse an den Rändern weniger Streichmasse auf der Warenbahn hinterläßt, so daß ein Übergangsbereich mit abfallendem Strichgewicht entsteht. Entsprechend breit muß ein Randstreifenbeschnitt ausfallen, denn visuell ist es für den Maschinenführer nicht erkennbar, bis wohin genau die Warenbahn ihr gefordertes Strichtgewicht aufweist. Auch verursacht die Wasserzufuhr ein Befeuchten der trockenen Bahnränder. Insbesondere bei leichtgewichtigen Papierbahnen hat dies ein Flattern der Bahnränder zur Folge. Die Laufeigenεchaften der Bahn verschlechtern sich bis hin zum Warenbahnabriß. Mit dieser bekannten Endabdichtung ist es nicht möglich, einen sauberen, von Streichmasse freien Warenbahnrand, zu erhalten.An end seal for a short dwell coating device of the type described in the preamble of claim 1 is already known from DE 38 15 764 AI. The upper outer surface of the end seal directed against the paper web has cavities through which water is introduced between said outer surface and the material web in order to achieve the tightness improve and reduce the wear of the end seal. A disadvantage of the known design is that the coating slip diluted by the introduced water leaves less coating slip on the edges of the material web, so that a transition area with a falling coat weight is created. An edge trim must be correspondingly wide, because the machine operator cannot visually see exactly where the web has its required coating weight. The water supply also causes the dry web edges to be moistened. In the case of lightweight paper webs in particular, this causes the web edges to flutter. The running properties of the web deteriorate up to the web break. With this known end seal, it is not possible to obtain a clean web edge free of coating slip.
Demgegenüber liegt der Erfindung die Aufgabe zugrunde, Streichrandbegrenzer zu schaffen, mit denen sich scharf abgegrenzte, von Streichmasse völlig freie Warenbahnenränder erreichen lassen, wobei ein Verschmutzen des Streichrandbegrenzers durch verkrustete Streichmasse vermieden werden soll.In contrast, the object of the invention is to provide coating edge limiters with which sharply delimited web edges that are completely free of coating slip can be reached, whereby contamination of the coating edge limiter by incrusted coating slip should be avoided.
Zur Lösung dieser Aufgabe sieht die Erfindung bei einem Streichrandbegrenzer nach dem Gattungsbegriff von Patentanspruch 1 die Kombination der Merkmale a) bis d) vor. Bevorzugte Ausführungsformen sind in den Unteransprüchen 2 bis 5 angegeben.To achieve this object, the invention provides a combination of features a) to d) in the case of a delimiter according to the preamble of claim 1. Preferred Embodiments are specified in subclaims 2 to 5.
Das mit dem Streichrandbegrenzer fest verbundene Formatblech deckt im Randbereich der Warenbahn die Auftragszone vollständig ab. Durch das im Dichtspalt zwischen Formatblech und Dichtklotz kontinuierlich zugeführte Wasser bildet sich ein Druckpolster, das die in der Beschichtungskammer unter Druck stehende Streichmasse am seitlichen Ausfluß hindert und dafür sorgt, daß das Formatblech flächig an die Warenbahn angepreßt wird. Folglich kann dort, wo das Formatblech die Warenbahn abdeckt, keine Streichmasse auf die Warenbahn aufgetragen werden. Damit ist eine scharfe Abgrenzung zwischen gestrichener Warenbahn und abzuschneidendem Randstreifen gegeben, d. h. die erfindungsgemäßen Streichrandbegrenzer ermöglichen ein sehr genaues Einstellen der zu produzierenden Warenbahnbreite.The sheet metal firmly connected to the coating edge delimiter completely covers the application zone in the edge area of the web. The water continuously supplied in the sealing gap between the format plate and the sealing block forms a pressure cushion which prevents the coating compound under pressure in the coating chamber from flowing out from the side and ensures that the format plate is pressed flat against the web. As a result, no coating slip can be applied to the web where the format sheet covers the web. This provides a clear distinction between the coated web and the edge strip to be cut, i.e. H. the coating edge limiters according to the invention enable a very precise adjustment of the web width to be produced.
Das vorzugsweise aus Federstahl hergestellte, wenige Zehntel mm, vorzugsweise < 0,4 mm, dicke Formatblech paßt sich gut der gekrümmten Kontur der Gegenwalze an. Dabei wird die Auftragszone bis unmittelbar vor dem Rakelelement abgedeckt. Der vorteilhaft um 5 bis 20 % vom Formatblech überlappte Dichtklotz hat dagegen eine einfache Kontur, die einem mehr oder weniger stark gebogenem Rakelelement nicht exakt angepaßt werden muß. Das Austreten von Streichmasse verhindert, wie bereits beschrieben, das in den Dichtspalt durch Zuführen von Wasser aufgebaute Druckpolster. Da die Oberfläche des Formatbleches im Gegensatz zur bewegten Warenbahnoberflache in Ruhe verharrt, nimmt dort die Strömungsgeschwindigkeit der Streichmasse stark ab. Ein Durchmischen der Streichmasse mit dem zugeführten Wasser findet nur in einem geringen Maß statt. Als Nebeneffekt verhindert der aus dem Dichtspalt nach außen permanente Wasserabfluß störende Farbablagerungen, so daß sich der Streichrandbegrenzer selber sauber hält.The format sheet, preferably made of spring steel, a few tenths of a mm, preferably <0.4 mm, thickly adapts to the curved contour of the counter-roller. The application zone is covered until just before the doctor element. The sealing block, which is advantageously overlapped by 5 to 20% of the format sheet, has a simple contour, which does not have to be exactly adapted to a more or less strongly curved doctor element. The spreading of coating slip, as already described, prevents this in the sealing gap pressure pads built up by supplying water. Since the surface of the format plate remains at rest, in contrast to the moving surface of the web, the flow speed of the coating slip decreases considerably there. Mixing of the coating slip with the supplied water takes place only to a small extent. As a side effect, the permanent drainage of water from the sealing gap prevents annoying paint deposits, so that the coating edge limiter keeps itself clean.
Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, daß der Dichtklotz aus Metall, insbesondere rostfreiem Stahl, hergestellt ist. Aufgrund der guten Wärmeleitfähigkeit von Metallen bildet sich auf der Oberfläche des Dichtklotzes, der durch das permanente durchströmende kalte Wasser relativ kalt ist, Kondenswasser, so daß sich hier keine Streichmasse ablagern kann. Der Bereich am Rakelelement ist bei bisher bekannten Kunststoff- oder Gummidichtungen besonders von Streichmassenablagerungen gefährdet, da dort ein vollständiges Anliegen der Dichtung bzw. des Dichtklotzes am Rakelelement für verschiedene hohe Andruckkräfte mit der Folge unterschiedlicher Krümmung des Rakelelementes nicht möglich ist.An advantageous embodiment of the invention provides that the sealing block is made of metal, in particular stainless steel. Due to the good thermal conductivity of metals, condensate forms on the surface of the sealing block, which is relatively cold due to the permanently flowing cold water, so that no coating slip can be deposited here. The area on the squeegee element in previously known plastic or rubber seals is particularly at risk from coating slip deposits, since there it is not possible for the seal or the sealing block to lie completely against the squeegee element for different high pressure forces, with the result of different curvature of the squeegee element.
Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung benetzt eine Wassersprüheinrichtung mittels feinem Wasserstrahl die Oberfläche des Formatbleches, die der Warenbahn zugewandt ist, um insbesondere bei abrasivem Rohpapier die miteinander reibenden Oberflächen zu schmieren und damit den Verschleiß des Formatbleches zu minimieren. Versuche zeigten, daß die dazu erforderliche Wassermenge derart gering ist, daß keine negativen Auswirkungen auf den Warenbahnrand festzustellen waren. Somit kann die Standzeit des Formatbleches von Stunden auf bis zu mehreren Wochen ausgedehnt werden. Ein Auswechseln des Formatbleches erfolgt über eine Klemmvorrichtung mit geringem Zeitaufwand, ohne daß besondere Einstellarbeiten am Streichrandbegrenzer erforderlich sind.In a further advantageous embodiment of the invention, a water spray device uses a fine water jet to wet the surface of the sheet metal that faces the web especially with abrasive base paper to lubricate the surfaces rubbing against each other and thus to minimize wear of the format plate. Experiments showed that the amount of water required for this is so small that there were no negative effects on the edge of the web. This means that the service life of the sheet metal can be extended from hours to several weeks. The format plate can be replaced in a short time using a clamping device, without requiring any special adjustment work on the coating edge limiter.
Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnungen beschrieben.An embodiment of the invention is described below with reference to the drawings.
Fig. 1 zeigt einen auf den für die Erfindung wesentlichen Bereich beschränkten Schnitt durch den in der Streicheinrichtung eingesetzten, erfindungsgemäßen Streichrandbegrenzer;1 shows a section, limited to the area essential for the invention, through the coating edge limiter according to the invention used in the coating device;
Fig. 2 zeigt eine Draufsicht auf den, in der Streicheinrichtung auf der rechten Seite angeordneten Streichrandbegrenzer.FIG. 2 shows a top view of the streak edge delimiter arranged in the coating device on the right-hand side.
Einzelheiten einer Streicheinrichtung sind aus der US-PS 4,250,211 ersichtlich. Nachstehend werden daher nur die sich auf die Erfindung beziehenden Teile einer solchen Streicheinrichtung beschrieben. Zwischen Gegenwalze (1), um die die Warenbahn (2) geführt ist, der Stauwand (4), dem RakelelementDetails of a coating device can be seen from US Pat. No. 4,250,211. Therefore, only the parts of such a coating device relating to the invention are described below. Between the counter roller (1) around which the web (2) is guided, the baffle wall (4), the doctor element
(3) und den an beiden Enden der Streicheinrichtung angeordneten Dichtklötzen (5) bildet sich eine nicht näher gezeichnete Beschichtungskam er, in die Streichmasse unter Druck eingespeist wird. Das Rakelelement (3) stützt sich am Teil (18) ab. Das Auftragsgewicht liegt in der Größenordnung von 5 bis 16 g/m2 und wird maßgeblich durch die Andruckkraft des Rakelelementes (3) bestimmt. Überschüssige Streichmasse wird über die Stauwand(3) and the sealing blocks (5) arranged at both ends of the coating device, a coating (not shown) is formed, into which coating material is fed under pressure. The doctor element (3) is supported on the part (18). The application weight is in the order of 5 to 16 g / m 2 and is largely determined by the pressure force of the doctor element (3). Excess coating is spread over the dam wall
(4) abgeführt.(4) dissipated.
Gemäß Fig. 1 deckt das Formatblech (8) die zwischen Rakelelement (3) und Stauwand (4) gebildete Auftragszone (12) fast vollständig ab, so daß, wie in Fig. 2 gezeigt ist, der Randbereich (14) der Warenbahn (2) scharf abgegrenzt ist und völlig von Streichmasse freigehalten wird. In jedem Dichtklotz (5) befinden sich drei Vertiefungen (11) in Gestalt einer Einfräsung, die im Bereich der Stauwand (4) offen ist und vor dem Rakelelement (3) endet. Über eine zentral angeordnete Wasserzuführung (20) im Dichtklotz (5) sind die Vertiefungen (11) jeweils über einen Kanal (13) verbunden. Das durch die Kanäle (13) zugeführte Wasser bildet in den Vertiefungen (11) ein Druckpolster, das für das Anpressen des Formatbleches (8) an die Warenbahn (2) sorgt und sicher verhindert, daß die in der Beschichtungskammer unter Druck stehende Streichmasse seitlich durch den ca. 1,5 mm breiten Dichtspalt (15) ausfließen kann. Der Wasserverbrauch des Streichrandbegrenzers beträgt ca. 2 bis 5 Liter pro Minute und ist gegenüber einem Farbdurchsatz von bis zu 1.000 Liter pro Minute vernachlässigbar gering, so daß keine besonderen Vorkehrungen zur Wasserabfuhr nötig sind. Das seitlich aus dem Streichrandbegrenzer abfließende Wasser wird zusammen mit der überschüssigen Streichmasse abgeführt.1, the format sheet (8) covers the application zone (12) formed between the doctor element (3) and the baffle wall (4) almost completely, so that, as shown in FIG. 2, the edge region (14) of the web (2 ) is sharply delineated and completely kept free of coating slip. In each sealing block (5) there are three recesses (11) in the form of a milled opening that is open in the area of the storage wall (4) and ends in front of the doctor element (3). The depressions (11) are each connected via a channel (13) via a centrally arranged water supply (20) in the sealing block (5). The water supplied through the channels (13) forms a pressure cushion in the recesses (11), which ensures that the format plate (8) is pressed against the web (2) and reliably prevents the coating compound under pressure in the coating chamber from passing through the approx. 1.5 mm wide Sealing gap (15) can flow out. The water consumption of the coating edge limiter is approx. 2 to 5 liters per minute and is negligible compared to a paint throughput of up to 1,000 liters per minute, so that no special precautions for water drainage are necessary. The water flowing out of the side of the coating edge limiter is drained off together with the excess coating material.
Das Formatblech (8) ist mit der Klemmvorrichtung (19) auf dem Formatblechhalter (7) befestigt. Der Formatblechhalter (7) wiederum ist fest mit dem Dichtklotz (5) verbunden und ragt über die Stauwand (4), ohne diese zu berühren, nach außen. Am äußeren Ende des Formatblechhalters (7) ist eine Wassersprüheinrichtung (9) angeordnet. Durch die Nadeldüse (10), die einen Durchmesser von 0,5 mm aufweist, wird mit einem Druck von ca. 0,5 bis 1 bar ein feiner Wasserstrahl (16) auf das Formatblech (8) gesprüht.The format plate (8) is attached to the format plate holder (7) with the clamping device (19). The sheet metal holder (7) is in turn firmly connected to the sealing block (5) and projects outward beyond the storage wall (4) without touching it. A water spray device (9) is arranged at the outer end of the sheet metal holder (7). A fine water jet (16) is sprayed onto the format plate (8) through the needle nozzle (10), which has a diameter of 0.5 mm, at a pressure of approximately 0.5 to 1 bar.
Mit dem Schiebeelement (6) ist der Streichrandbegrenzer als Einheit quer zur Bahnlaufrichtung verschiebbar angeordnet. With the sliding element (6), the coating edge limiter is arranged as a unit which can be moved transversely to the web running direction.

Claims

Patentansprüche claims
Streichrandbegrenzer für eine Kurzverweilzeit- Streicheinrichtung mitStroke limiter for a short dwell coater
- einer Gegenwalze (1), deren Mantelfläche zum Tragen einer Warenbahn (2), insbesondere einer Papierbahn, bestimmt ist,- a counter roller (1), the outer surface of which is intended for carrying a web (2), in particular a paper web,
- einem Rakelelement (3), welches sich über die gesamte Breite der Warenbahn (2) erstreckt und zum Auftragen der Streichfarbe vorgesehen ist,- a doctor element (3) which extends over the entire width of the web (2) and is provided for applying the coating color,
- einer Stauwand (4), die parallel zum Rakelelement (3) ausgerichtet ist und eine Auftragszone (12) zwischen Stauwand (4) und Rakelelement (3) bildet, und- A baffle (4) which is aligned parallel to the doctor element (3) and forms an application zone (12) between the baffle (4) and doctor element (3), and
- zwei Streichrandbegrenzer, die je einen Dichtklotz (5) und ein Schiebeelement (6) aufweisen und im Randbereich (14) quer zur Bahnrichtung verschiebbar angeordnet sind, gekennzeichnet durch die Kombination folgender- Two stroke limiters, each having a sealing block (5) and a sliding element (6) and are arranged in the edge region (14) displaceable transversely to the web direction, characterized by the combination of the following
Merkmale: a) mit dem Dichtklotz (5) ist ein Formatblech¬ halter (7), der über die Stauwand (4) nach außen ragt, fest verbunden; b) auf dem Formatblechhalter (7) ist ein dünnes Formatblech (8) derart angeordnet, daß es sich von außen über die Stauwand (4) in den Raum zwischen Stauwand (4) und Rakelelement (3) erstreckt, um die Auftragszone (12) im Randbereich (14) der Warenbahn (2) vollständig abzudecken; c) der Dichtklotz (5) hat auf der zum Formatblech (8) gewandten Seite wenigstens eine Vertiefung (11), die sich parallel zur Bahnlaufrichtung erstreckt und durch einen Kanal (13) mit einer Wasserzufuhr (20) verbunden ist; d) zwischen Formatblech (8) und Dichtklotz (5) ist ein schmaler Dichtspalt (15) von 1 bis 3 nun Breite ausgebildet, wobei das durch die Vertiefung (11) in den Dichtspalt (15) eingeführte Wasser ein Druckpolster erzeugt und das Formatblech (8) flächig an die Warenbahn (2) anpreßt.Features: a) with the sealing block (5) a format sheet holder (7), which protrudes outward beyond the baffle wall (4), is firmly connected; b) on the format sheet holder (7) a thin format sheet (8) is arranged such that it extends from the outside over the baffle wall (4) into the space between baffle wall (4) and doctor element (3) to the application zone (12) to cover completely in the edge area (14) of the web (2); c) the sealing block (5) has on the side facing the format plate (8) at least one recess (11) which extends parallel to the web running direction and is connected by a channel (13) to a water supply (20); d) a narrow sealing gap (15) of 1 to 3 width is formed between the format plate (8) and the sealing block (5), the water introduced through the recess (11) into the sealing gap (15) creating a pressure cushion and the format plate ( 8) presses flat against the web (2).
2. Streichrandbegrenzer nach Anspruch 1, dadurch gekennzeichnet, daß das Formatblech (8) eine Dicke von < 0,4 mm aufweist, aus Federstahl hergestellt ist und mittels Klemmung am Formatblechhalter (7) befestigt ist.2. scraper according to claim 1, characterized in that the format plate (8) has a thickness of <0.4 mm, is made of spring steel and is fixed by clamping on the format plate holder (7).
3. Streichrandbegrenzer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Formatblech (8) quer zur Bahnlaufrichtung eine Breite hat, die die Breite des Dichtklotzes (5) um 5 bis 20 % überlappt. 3. scraper according to claim 1 or 2, characterized in that the format plate (8) transverse to the web running direction has a width which overlaps the width of the sealing block (5) by 5 to 20%.
4. Streichrandbegrenzer nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Dichtklotz (5) aus metallischem Material hergestellt ist.4. scraper according to one of claims 1 to 3, characterized in that the sealing block (5) is made of metallic material.
5. Streichrandbegrenzer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß eine Wassersprüheinrichtung (9) am freien Ende des Formatblechhalters (7) angeordnet ist, daß die Wasserεprüheinrichtung (9) eine Nadeldüse (10) aufweist, durch die ein feiner Wasserstrahl (16) auf das Formatblech (8) gesprüht wird. 5. scraper according to one of claims 1 to 4, characterized in that a water spray device (9) is arranged at the free end of the sheet metal holder (7), that the water spray device (9) has a needle nozzle (10) through which a fine water jet ( 16) is sprayed onto the format plate (8).
EP95943513A 1994-07-15 1995-07-08 Painting edge limiter for a painting arrangement with a short residence time Expired - Lifetime EP0771377B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4425137 1994-07-15
DE4425137A DE4425137C1 (en) 1994-07-15 1994-07-15 Scraper blade assembly margins held to paper web by water pressure block
PCT/EP1995/002673 WO1996002703A1 (en) 1994-07-15 1995-07-08 Painting edge limiter for a painting arrangement with a short residence time

Publications (2)

Publication Number Publication Date
EP0771377A1 true EP0771377A1 (en) 1997-05-07
EP0771377B1 EP0771377B1 (en) 1998-10-07

Family

ID=6523316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95943513A Expired - Lifetime EP0771377B1 (en) 1994-07-15 1995-07-08 Painting edge limiter for a painting arrangement with a short residence time

Country Status (8)

Country Link
US (1) US5795393A (en)
EP (1) EP0771377B1 (en)
AT (1) ATE171986T1 (en)
CA (1) CA2195201C (en)
DE (2) DE4425137C1 (en)
FI (1) FI970127A (en)
NO (1) NO970134L (en)
WO (1) WO1996002703A1 (en)

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DE19631888A1 (en) * 1996-08-07 1998-02-12 Voith Sulzer Papiermasch Gmbh Applicator for direct or indirect application of a liquid or pasty coating medium to a running material web, in particular made of paper or cardboard
DE29613687U1 (en) * 1996-08-07 1996-10-24 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Applicator for direct or indirect application of a liquid or pasty coating medium to a running material web, in particular made of paper or cardboard
DE29712431U1 (en) * 1997-07-14 1997-09-18 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Device for applying a liquid or pasty medium to a surface moving in one direction
DE19839916A1 (en) * 1998-09-02 2000-03-09 Jagenberg Papiertech Gmbh Method and apparatus for reducing the volume or pressure of a fluid being dragged into a gap by moving surfaces
US6113743A (en) * 1999-06-16 2000-09-05 Vice; Gerald End dam for waterbox of paper making machine
DE19960748A1 (en) * 1999-12-16 2001-06-21 Voith Paper Patent Gmbh Application device for paint/adhesive to moving paper length etc. has limiting element to limit width of application roller edge areas coated by etting nozzles
GB0204390D0 (en) * 2002-02-26 2002-04-10 Eastman Kodak Co A method and system for coating
EP2350388A1 (en) * 2008-10-23 2011-08-03 3M Innovative Properties Company An end sealing device for a metering nip, a coater with a sealed end and a method of using same
US20120121814A1 (en) * 2010-11-11 2012-05-17 Robert Eugene Krautkramer Sealed Metered Coating Apparatus

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US4434194A (en) * 1982-02-22 1984-02-28 Consolidated Papers, Inc. Edge dam for paper coating apparatus and method
FI82107C (en) * 1987-05-07 1991-01-10 Valmet Paper Machinery Inc Edge gasket for short-dwell coating device
FI81734C (en) * 1987-12-03 1990-12-10 Valmet Paper Machinery Inc FOERFARANDE OCH ANORDNING FOER APPLICERING OCH DOSERING AV BESTRYKNINGSMEDEL PAO ROERLIGT UNDERLAG.
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Title
See references of WO9602703A1 *

Also Published As

Publication number Publication date
ATE171986T1 (en) 1998-10-15
CA2195201A1 (en) 1996-02-01
US5795393A (en) 1998-08-18
DE59503865D1 (en) 1998-11-12
WO1996002703A1 (en) 1996-02-01
CA2195201C (en) 2000-01-25
NO970134D0 (en) 1997-01-13
EP0771377B1 (en) 1998-10-07
FI970127A0 (en) 1997-01-13
DE4425137C1 (en) 1995-09-14
FI970127A (en) 1997-01-13
NO970134L (en) 1997-03-04

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