EP0556551B1 - Roller assembly for applying a coating colour onto a paper web - Google Patents

Roller assembly for applying a coating colour onto a paper web Download PDF

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Publication number
EP0556551B1
EP0556551B1 EP93100309A EP93100309A EP0556551B1 EP 0556551 B1 EP0556551 B1 EP 0556551B1 EP 93100309 A EP93100309 A EP 93100309A EP 93100309 A EP93100309 A EP 93100309A EP 0556551 B1 EP0556551 B1 EP 0556551B1
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EP
European Patent Office
Prior art keywords
roller
doctor
paper web
blade
surplus
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
EP93100309A
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German (de)
French (fr)
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EP0556551A1 (en
Inventor
Rudolf Beisswanger
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
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JM Voith GmbH
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Filing date
Publication date
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Publication of EP0556551A1 publication Critical patent/EP0556551A1/en
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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
    • 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
    • D21H23/40—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 only one side of the paper being in contact with the material
    • 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

Definitions

  • the invention relates to an applicator for applying coating color to a paper web, according to the preamble of claim 1, in particular roller applicator.
  • GB-A-2 178 677 shows and describes an application work for applying coating color on a paper web.
  • This device works with an application roller and a counter roller assigned to it.
  • An inlet gusset and an outlet gusset are formed between the application roller and the counter roller.
  • a deflector device follows the outlet gusset.
  • the squeegee has crucial functions to perform. It should help to create a closed, and relatively thick layer that is completely smooth and free of squeegee strips.
  • Different types of squeegees are conceivable, for example with a stiff blade, with a curved blade (bentblade), which in its free end region clings tangentially to the coated paper web and the squeegee.
  • the apperative effort for such doctor devices is very considerable. Nevertheless, the doctoring devices known to date have not met the required demands on the line quality.
  • the invention has for its object to design a commissioned work according to the preamble of claim 1 such that the line quality is further improved, in particular with regard to smoothness, closedness of the line surface and with regard to the sensitive metering of the line weight, and this with reasonable apperative effort.
  • the roller applicator shown in Figure 1 comprises an applicator roller 1, which rotates in a coating sump 2.
  • the coating sump 2 is located in a trough 3.
  • the trough 3 has a brush-colored inlet 7.
  • the trough wall is designed as a guide wall 8. It ends with an overflow edge 9 ("first overflow edge"). At this point, an overflow channel 10 is connected for a first overflow stream.
  • a guide body 20 adjoins the guide wall 8 after the overflow edge 9. This extends to the inlet gusset. It forms a flow channel 21 with the lateral surface of the application roller 1. At its downstream end it forms a second overflow edge 22 for a second overflow stream.
  • the guide body 20 has a discharge channel 23. This is used to derive a second overflow current. This current arises from the fact that excess coating color passes over the overflow edge 22 and - through the discharge channel 23 - flows in the flow channel 21 against the direction of flow.
  • the guide body 20 also has a throttle point 24, which can serve as an overflow edge and then forms the third overflow edge. It also carries an air scraper 25.
  • the flow channel 23 is provided with a valve 26 at its downstream end.
  • the three overflow flows which overflow at the overflow edges 9, 22 and 24, all open into a single collecting channel, namely the overflow channel 10.
  • the coated paper web 5 After passing through the order zone, the coated paper web 5 gets into the outlet gusset. There it runs past a leveling rod 30 and finally a doctor blade 31. This area is of primary importance for the present invention.
  • the leveling rod 30 is part of a deflector 40.
  • This deflector has a first guide surface 41 for deriving a first excess of coating color 42 from the outlet gusset, and also a second guide surface 43 for the doctor blade excess 46 which is produced on the doctor blade 31.
  • the two guide surfaces 41, 43 are brought together in an end edge 44, which in the present case tapers and where the two excess flows 42, 46 meet.
  • the first guide surface 41 is rigidly concave, the second guide surface 43 is somewhat less strong.
  • the deflector 40 is fastened to the fixed environment by means of brackets 45.
  • the brackets 45 consist of relatively thin plates, which - distributed over the width of the machine - are arranged side by side, leaving gaps.
  • the leveling rod 30 can be adjusted more or less strongly against the coated paper web 5 by means of an inflatable rubber tube 47.
  • the deflector 40 is suspended from a joint 48 so that it can pivot in the direction of the arrow 49. It can be locked in various angular positions.
  • FIG. 2 shows a roller applicator according to the prior art.
  • the basic elements are also present here, namely the application roller 1, the counter roller 4, the trough 3, etc.
  • the deflector designed according to the invention is missing.
  • the two doctor blades ie the pre-doctor blade 30 as well as the last doctor blade 31, can be designed in different ways. For example, they can be designed as a blade, as a doctor blade or as a smooth rod.

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  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Golf Clubs (AREA)

Abstract

The invention relates to a roller assembly for applying a coating compound to a paper web, having the following features: An applicator device; a counter-roller about which the paper web is looped; an inlet gusset formed between the counter-roller and the applicator device, and an outlet gusset; a blade arranged downstream of the outlet gusset, which scrapes off the excess coating compound (scraping excess) from the paper web. The invention is characterised by the following features: Between the applicator device and the blade, a deflector device is provided; the deflector device has a first guide surface for diverting a first coating compound excess out of the outlet gusset, and a second guide surface for the scraping excess. <IMAGE>

Description

Die Erfindung betrifft ein Auftragswerk zum Auftragen von Streichfarbe auf eine Papierbahn, gemäß dem Oberbegriff von Anspruch 1, insbesondere Walzenauftragswerk.The invention relates to an applicator for applying coating color to a paper web, according to the preamble of claim 1, in particular roller applicator.

Auftragswerke dieser Art sind aus DE-A-36 05 409 Al bekannt geworden. Durch diese Einrichtung soll ein gleichmäßiger Strich erzeugt werden.Commissioned works of this type have become known from DE-A-36 05 409 A1. This device is intended to produce a uniform stroke.

GB-A-2 178 677 zeigt und beschreibt ein Auftragswerk zum Auftragen von Streichfarbe auf eine Papierbahn. Diese Vorrichtung arbeitet mit einer Auftragswalze sowie eine dieser zugeordnete Gegenwalze. Zwischen Auftragswalze und Gegenwalze sind ein Einlaufzwickel und ein Auslaufzwickel gebildet. Es folgt auf den Auslaufzwickel eine Deflektoreinrichtung.GB-A-2 178 677 shows and describes an application work for applying coating color on a paper web. This device works with an application roller and a counter roller assigned to it. An inlet gusset and an outlet gusset are formed between the application roller and the counter roller. A deflector device follows the outlet gusset.

Bei solchen Auftragwerken treten Probleme vor allem in der keilförmigen Einlaufzone zwischen Auftragswalze und Gegenwalze auf, und zwar besonders bei hohen Geschwindigkeiten, aber auch in der Auslaufzone, bevor die mit Streichfarbe versehene Papierbahn die Rakel erreicht. Dabei hat die Rakel entscheidene Funktionen zu erfüllen. Sie soll mit dazu beitragen, eine geschlossene, und relativ dicke Schicht zu erzeugen, die völlig glatt und frei von Rakelstreifen ist. Dabei sind unterschiedliche Arten von Rakeln denkbar, beispielsweise mit steifer Klinge (stiff-blade), mit gebogener Klinge (bentblade), die sich in ihrem freien Endbereich tangential an die gestrichene Papierbahn anschmiegt sowie die Rollrakel. Der apperative Aufwand für solche Rakeleinrichtungen ist ganz erheblich. Dennoch haben die bisher bekannten Rakeleinrichtungen nicht den geforderten Ansprüchen an die Strichqualität genügt.With such applicators, problems occur primarily in the wedge-shaped inlet zone between the applicator roller and the counter roller, particularly at high speeds, but also in the outlet zone before the paper web provided with a coating color reaches the doctor blade. The squeegee has crucial functions to perform. It should help to create a closed, and relatively thick layer that is completely smooth and free of squeegee strips. Different types of squeegees are conceivable, for example with a stiff blade, with a curved blade (bentblade), which in its free end region clings tangentially to the coated paper web and the squeegee. The apperative effort for such doctor devices is very considerable. Nevertheless, the doctoring devices known to date have not met the required demands on the line quality.

Der Erfindung liegt die Aufgabe zugrunde, ein Auftragswerk gemäß dem Oberbegriff von Anspruch 1 derart zu gestalten, daß die Strichqualität noch weiter verbessert wird, insbesondere bezüglich Glätte, Geschlossenheit der Strichoberfläche sowie bezüglich der feinfühligen Dosierung des Strichgewichtes, und zwar bei vertretbarem apperativem Aufwand.The invention has for its object to design a commissioned work according to the preamble of claim 1 such that the line quality is further improved, in particular with regard to smoothness, closedness of the line surface and with regard to the sensitive metering of the line weight, and this with reasonable apperative effort.

Diese Aufgabe wird durch die kennzeichnenden Merkmale von Anspruch 1 gelöst.This object is solved by the characterizing features of claim 1.

Demgemäß wird im einzelnen folgendes vorgesehen:

  • (a) Zwischen der eigentlichen Auftragszone und der Rakel wird ein Deflektor vorgesehen;
  • (b) der Deflektor umfaßt eine erste Leitfläche zum Ableiten eines ersten Streichfarben-Überschusses aus dem Auslaufzwickel sowie eine zweite Leitfläche für den Rakelüberschuß;
  • (c) die beiden Leitflächen sind in einer Endkante zusammengeführt, an der sich die beiden Überschußströme treffen.
Accordingly, the following is provided in detail:
  • (a) A deflector is provided between the actual application zone and the doctor blade;
  • (b) the deflector comprises a first guide surface for deriving a first excess of coating color from the outlet gusset and a second guide surface for the doctor blade excess;
  • (c) the two guide surfaces are brought together in an end edge at which the two excess currents meet.

Diese Maßnahmen stellen sicher, daß der schwierige Bereich des Auslaufzwickels besser unter Kontrolle kommt. Es findet somit eine Vor-Rakelung statt, die im Endergebnis zu einer besseren Strichqualität, insbesondere zu einer höheren Glätte der Streichfarben-Oberfläche führt.These measures ensure that the difficult area of the outlet gusset is better controlled. A pre-doctoring takes place, which in the end results in better line quality, in particular in a higher smoothness of the coating color surface.

Die Erfindung ist anhand der Zeichnung näher erläutert. Darin ist im einzelnen folgendes dargestellt:

  • Figur 1 zeigt ein Walzenauftragswerk gemäß der Erfindung in Seitenansicht gesehen.
  • Figur 2 zeigt ein Walzenauftragswerk gemäß dem Stand der Technik.
The invention is explained in more detail with reference to the drawing. The following is shown in detail:
  • Figure 1 shows a roller applicator according to the invention seen in side view.
  • Figure 2 shows a roller applicator according to the prior art.

Das in Figur 1 dargestellte Walzenauftragswerk umfaßt eine Auftragswalze 1, die in einem Streichfarbensumpf 2 umläuft. Der Streichfarbensumpf 2 befindet sich in einem Trog 3. Der Auftragswalze 1 ist eine Gegenwalze 4 zugeordnet, die von einer Papierbahn 5 umschlungen ist. Beide Walzen laufen im Sinne der Pfeile 6 gegenläufig, jedoch nicht mit derselben Umfangsgeschwindigkeit um (Verhältnis vGegenwalze:vAuftragswalze = 10). Sie bilden miteinander einen keilförmigen Einlaufzwickel - in der Darstellung links - sowie einen keilförmigen Auslaufzwickel - in der Darstellung rechts.The roller applicator shown in Figure 1 comprises an applicator roller 1, which rotates in a coating sump 2. The coating sump 2 is located in a trough 3. The application roller 1 is assigned a counter roller 4, which is wrapped in a paper web 5. Both rollers run in opposite directions in the direction of arrows 6, but not at the same peripheral speed (ratio v counter roller : v application roller = 10). Together they form a wedge-shaped inlet gusset - on the left in the illustration - and a wedge-shaped outlet gusset - on the right in the illustration.

Der Trog 3 weist einen streichfarbenen Zulauf 7 auf. Im aufsteigenden Bereich der Auftragswalze 1 ist die Trogwand als Leitwand 8 ausgebildet. Sie endet mit einer Überlaufkante 9 ("erste Überlaufkante"). An dieser Stelle ist eine Überlaufrinne 10 für einen ersten Überlaufstrom angeschlossen.The trough 3 has a brush-colored inlet 7. In the ascending area of the application roller 1, the trough wall is designed as a guide wall 8. It ends with an overflow edge 9 ("first overflow edge"). At this point, an overflow channel 10 is connected for a first overflow stream.

An die Leitwand 8 schließt sich - nach der Überlaufkante 9 - ein Leitkörper 20 an. Dieser erstreckt sich zum Einlaufzwickel hin. Dabei bildet er mit der Mantelfläche der Auftragswalze 1 einen Strömungskanal 21. An seinem stromabwärtigen Ende bildet er eine zweite Überlaufkante 22 für einen zweiten Überlaufstrom.A guide body 20 adjoins the guide wall 8 after the overflow edge 9. This extends to the inlet gusset. It forms a flow channel 21 with the lateral surface of the application roller 1. At its downstream end it forms a second overflow edge 22 for a second overflow stream.

Der Leitkörper 20 weist einen Ableitkanal 23 auf. Dieser dient zum Ableiten eines zweiten Überlaufstromes. Dieser Strom entsteht dadurch, daß überschüssige Streichfarbe über die Überlaufkante 22 übertritt und - durch den Ableitkanal 23 - entgegen der Strömungsrichtung im Strömungskanal 21 fließt.The guide body 20 has a discharge channel 23. This is used to derive a second overflow current. This current arises from the fact that excess coating color passes over the overflow edge 22 and - through the discharge channel 23 - flows in the flow channel 21 against the direction of flow.

Der Leitkörper 20 weist ferner eine Drosselstelle 24 auf, die als Überlaufkante dienen kann, und dann die dritte Überlaufkante bildet. Außerdem trägt er einen Luftschaber 25. Der Strömungskanal 23 ist an seinem stromabwärts gelegenen Ende mit einem Ventil 26 versehen.The guide body 20 also has a throttle point 24, which can serve as an overflow edge and then forms the third overflow edge. It also carries an air scraper 25. The flow channel 23 is provided with a valve 26 at its downstream end.

Die drei Überlaufströme, die an den Überlaufkanten 9, 22 und 24 überlaufen, münden allesamt in eine einzige Sammelrinne, nämlich die Überlaufrinne 10.The three overflow flows, which overflow at the overflow edges 9, 22 and 24, all open into a single collecting channel, namely the overflow channel 10.

Nach dem Durchlaufen der Auftrags zone gelangt die beschichtete Papierbahn 5 in den Auslaufzwickel. Dort läuft sie an einem Egalisierstab 30 vorbei, und schließlich an einer Rakel 31. Dieser Bereich ist für die vorliegende Erfindung von primärer Bedeutung.After passing through the order zone, the coated paper web 5 gets into the outlet gusset. There it runs past a leveling rod 30 and finally a doctor blade 31. This area is of primary importance for the present invention.

Der Egalisierstab 30 ist Bestandteil eines Deflektors 40. Dieser Deflektor weist eine erste Leitfläche 41 zum Ableiten eines ersten Streichfarben-Überschusses 42 aus dem Auslaufzwickel auf, ferner eine zeite Leitfläche 43 für den Rakelüberschuß 46, der an der Rakel 31 anfällt.The leveling rod 30 is part of a deflector 40. This deflector has a first guide surface 41 for deriving a first excess of coating color 42 from the outlet gusset, and also a second guide surface 43 for the doctor blade excess 46 which is produced on the doctor blade 31.

Die beiden Leitflächen 41, 43 sind in einer Endkante 44 zusammengeführt, die im vorliegenden Falle spitz zuläuft, und an der sich die beiden Überschußströme 42, 46 treffen.The two guide surfaces 41, 43 are brought together in an end edge 44, which in the present case tapers and where the two excess flows 42, 46 meet.

Die erste Leitfläche 41 ist starr konkav gekrümmt, die zweite Leitfläche 43 etwas weniger stark. Der Deflektor 40 ist mittels Konsolen 45 an der festen Umgebung befestigt. Die Konsolen 45 bestehen aus verhältnismäßig dünnen Platten, die - über die Breite der Maschine verteilt - unter Belassen von Zwischenräumen nebeneinander angeordnet sind.The first guide surface 41 is rigidly concave, the second guide surface 43 is somewhat less strong. The deflector 40 is fastened to the fixed environment by means of brackets 45. The brackets 45 consist of relatively thin plates, which - distributed over the width of the machine - are arranged side by side, leaving gaps.

Der Egalisierstab 30 ist mittels eines aufblasbaren Gummischlauches 47 mehr oder minder stark gegen die gestrichene Papierbahn 5 anstellbar.The leveling rod 30 can be adjusted more or less strongly against the coated paper web 5 by means of an inflatable rubber tube 47.

Im vorliegenden Falle ist der Deflektor 40 an einem Gelenk 48 aufgehängt, so daß er eine Schwenkbewegung in Richtung des Pfeiles 49 ausführen kann. Dabei ist er in verschiedenen Winkelpositionen arretierbar.In the present case, the deflector 40 is suspended from a joint 48 so that it can pivot in the direction of the arrow 49. It can be locked in various angular positions.

Im Gegensatz hierzu zeigt Figur 2 ein Walzenauftragswerk gemäß dem Stande der Technik. Auch hier sind die Grundelemente vorhanden, nämlich die Auftragswalze 1, die Gegenwalze 4, der Trog 3 usw. Jedoch fehlt es am erfindungsgemäß gestalteten Deflektor.In contrast to this, FIG. 2 shows a roller applicator according to the prior art. The basic elements are also present here, namely the application roller 1, the counter roller 4, the trough 3, etc. However, the deflector designed according to the invention is missing.

Die beiden Rakeln, also die Vor-Rakel 30 wie auch die letzte Rakel 31, können verschiedenartig gestaltet sein. Sie können beispielsweise als Klinge ausgebildet sein, als Rollrakel, oder als glatter Stab.The two doctor blades, ie the pre-doctor blade 30 as well as the last doctor blade 31, can be designed in different ways. For example, they can be designed as a blade, as a doctor blade or as a smooth rod.

Claims (4)

  1. Applicating device for applying coating paint onto a paper web, in particular a roller applicating device, with the following features:
    1.1 an applicating device, for example an application roller or an application nozzle;
    1.2 a counter-roller which is surrounded by the paper web; 1.3 an inlet gusset formed between counter-roller and applicating device as well as an outlet gusset;
    1.4 a doctor blade downstream of the outlet gusset which removes surplus coating paint (doctor-blade surplus) from the paper web;
    1.5 a deflector device (40) is provided between the applicating device and the doctor blade (31);
    1.6 the deflector device comprises a first guide surface (41.1) for removing a first coating paint surplus (42) from the outlet gusset as well as a second guide surface (43) for the doctor-blade surplus (44);
    1.7 the deflector device (40) comprises a pre-doctor knife (30) (levelling bar) which is pressed against the painted paper web (5), characterized in that
    1.8 the deflector device (40) comprises a body (51) which is cross-sectionally in the shape of a wing;
    1.9 the one end area (52) of the body (51) is located near the counter-roller (4) and extends essentially tangentially on its coating surface, whilst the other end area (44) is farther removed from the counter-roller;
    1.10 the body (51) is downstream of the pre-doctor blade (30), as seen in the running direction of the counter-roller (4).
  2. Applicating device according to Claim 1, characterized in that the two guide surfaces (41, 43) coincide in an end edge (44) where both surplus flows (42, 44) meet.
  3. Applicating device according to one of Claims 1 or 2, characterized in that the pre-doctor blade (30) is pressed against the paper web (5) by an inflatable bellows.
  4. Applicating device according to one of Claims 1 to 3, characterized by the following features:
    4.1 a collecting channel (61) for the doctor-blade surplus is provided;
    4.2 a guide plate (62) is provided which serves to remove doctor-blade surplus;
    4.3 the guide plate (62) is pivotable in two positions around an axis-parallel pivotal axis (63) above the collecting channel (61), and in the first position it introduces doctor-blade surplus into a trough (3), and in the second position into the collecting channel (61).
EP93100309A 1992-02-21 1993-01-12 Roller assembly for applying a coating colour onto a paper web Expired - Lifetime EP0556551B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4205314 1992-02-21
DE4205314 1992-02-21

Publications (2)

Publication Number Publication Date
EP0556551A1 EP0556551A1 (en) 1993-08-25
EP0556551B1 true EP0556551B1 (en) 1996-10-23

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EP93100309A Expired - Lifetime EP0556551B1 (en) 1992-02-21 1993-01-12 Roller assembly for applying a coating colour onto a paper web

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US (1) US5474608A (en)
EP (1) EP0556551B1 (en)
JP (1) JPH067729A (en)
AT (1) ATE144567T1 (en)
CA (1) CA2089919A1 (en)
DE (1) DE59304229D1 (en)
FI (1) FI930757A (en)

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DE3623402A1 (en) * 1985-07-31 1987-05-21 Jagenberg Ag METHOD AND DEVICE FOR CONTINUOUSLY APPLYING A Uniform Coating To A Material Web Running Across A Counter-Roller, Especially Paper Or Cardboard Web
DE3605409C3 (en) * 1986-02-20 1996-07-04 Voith Gmbh J M Device for coating running webs
DE3916620A1 (en) * 1989-05-22 1990-12-06 Jagenberg Ag DEVICE FOR COATING A MATERIAL RAIL THROUGH A COUNTER ROLLER
DE3934418A1 (en) * 1989-10-14 1991-04-18 Voith Gmbh J M RAKEL

Also Published As

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FI930757A0 (en) 1993-02-19
ATE144567T1 (en) 1996-11-15
US5474608A (en) 1995-12-12
JPH067729A (en) 1994-01-18
DE59304229D1 (en) 1996-11-28
CA2089919A1 (en) 1993-08-22
EP0556551A1 (en) 1993-08-25
FI930757A (en) 1993-08-22

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