EP0406529A2 - Coating device - Google Patents

Coating device Download PDF

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Publication number
EP0406529A2
EP0406529A2 EP90107009A EP90107009A EP0406529A2 EP 0406529 A2 EP0406529 A2 EP 0406529A2 EP 90107009 A EP90107009 A EP 90107009A EP 90107009 A EP90107009 A EP 90107009A EP 0406529 A2 EP0406529 A2 EP 0406529A2
Authority
EP
European Patent Office
Prior art keywords
coating
roller
counter
throttle
channel
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
EP90107009A
Other languages
German (de)
French (fr)
Other versions
EP0406529B1 (en
EP0406529A3 (en
Inventor
Martin Dr.-Ing. Kustermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE3942590A external-priority patent/DE3942590C2/en
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0406529A2 publication Critical patent/EP0406529A2/en
Publication of EP0406529A3 publication Critical patent/EP0406529A3/en
Application granted granted Critical
Publication of EP0406529B1 publication Critical patent/EP0406529B1/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • 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
    • 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

Definitions

  • the invention relates to a coating device according to the preamble of claim 1.
  • a coating device is known from DE-C 35 13 063.
  • a relatively large, spacious application space is provided on the coating blade and the counter roller guiding the web, which is on the inlet side the web is delimited by a front wall which has outlet openings.
  • This front wall extends almost to the point where it touches the counter roll.
  • the object of the invention is to improve the quality of the applied stroke with regard to uniformity in such or similar coating devices (see also German application P 36 12 248). Because of the high web speeds, it seems to be difficult with the previously known application devices of the generic type to prevent turbulence occurring in the coating slip.
  • the material web is guided by the counter roller 2 in the area of the coating blade 4.
  • the coating slip passes from the chamber 10 via the mouth channel 11 'to the mouth 11 and from there to the coating blade 4.
  • the coating slip is supplied with a certain excess, which in this case, however, can be significantly smaller than in the previously known coating devices.
  • An upper plate 1 as a cover body forms the throttle gap 8 with a width (width) of between 3 and 15 mm, preferably between 5 and 8 mm, relative to the coating blade 4.
  • the length of this channel is between 5 and 25 mm, preferably between 5 and 15 mm.
  • the tip 16 of the plate 1 (that is to say the edge which is rounded at most with a radius of 1 mm and is close to the counter roller 2) is approximately 3 to 10 mm away from the counter roller 2.
  • the plate 1 forms with a further plate 5 as a base cover body from the application space 9 on the doctor blade 4, where the coating compound flows from the mouth 11 to the scraper edge of the doctor blade, leading further throttle channel (drain channel) 7, which is essentially here Area between the mouth 11 and the front boundary wall 13 of the mouth 11 or the mouth channel 11 'and the chamber 10 extends. Its height is approximately between 3 and 6 mm and its length is essentially between ten and twenty times the specified height.
  • the throttle ducts are practically slit-shaped in sections parallel to the central longitudinal axis of the counter-roller 2, because in this direction they have an overall length corresponding to the length of the counter-roller, for example 8 m in length of the counter-roller 2 and a channel (slot) height of 5 or 8 mm (see for example "e") exceeds the latter by orders of magnitude (see for example also FIG. 5).
  • the application chamber prefferably feed the coating slip directly to the roller 2, which is then wrapped or touched by the material web in another area, in which the coating material is then transferred to the material web.
  • FIG. 2 shows yet another possible embodiment of the base body and cover body.
  • the reference symbols are each provided with an additional apostrophe.
  • the throttle channels each meet the conditions.
  • the feature of claim 2 is also fulfilled.
  • a doctor blade 30 can also be used as a doctor element, which is rotatably guided in a doctor bed 31, which is fastened to a support spring 32 designed as a leaf spring in the doctor clamp holder 33, 34.
  • the second throttle channel 8 ′′′ is formed by the cover body 1 ′′′ opposite the doctor holder 31 of the roller doctor 30.
  • the throttle channel 7 ′′′ can be controlled by a throttle slide 21 with throttle windows 22 in its throttle strength.
  • a throttle strip 24 with corresponding windows 25 is assigned to each slide.
  • the throttling action of the throttle channel can also be based essentially solely on the action of this slide 21.
  • This execution The shape of the coating can of course be adapted in a very comprehensive manner to the most varied conditions of the coating process, for example also the parameters of the coating composition, such as, for example, their consistency.
  • FIG. 6 shows a further variant of the arrangement according to the invention, the cover body 36 forming the first throttle duct 37 directly with a very thick front wall 43 of the mouth 41 of the chamber 50 for the coating slip.
  • this front wall 43 forms a substantially load-bearing component of the coating device or of the support beam for the coating blade 4.
  • Dash-dotted lines show how a constriction point at the outlet of the outlet channel 41 can be formed by a nose-shaped projection 44 of the front wall 43.
  • doctor blade 4 It is customary to adjust the doctor blade 4 by means of a pressure piece engaging in its free area, which can also be divided along the axis of the counter roller or the width of the paper web in order to exert different pressures on the doctor blade 4. This leads to a deflection of the same, so that the second throttle channel 8, 8 ', 8 ⁇ etc. could be changed quite greatly in its dimension. This is excluded if a coating device is used in which the contact angle of the coating blade 4 on the counter roller or paper web is kept constant by appropriate swivel conditions. Such a device has become known, inter alia, from US Pat. No. 4,637,338. Various other design options in this regard are known.
  • the support beam including the chamber for the coating compound including its mouth into the application zone and thus also the cover body and, if appropriate, the base body is pivoted to the same extent as the angular position of the clamping of the coating blade changes.
  • the conditions in the area of the second throttle duct remain essentially with everyone Obtain operating conditions so that the dimensions of the second throttle channel do not change significantly.
  • Fig. 7 and Fig. 7a an arrangement is shown in cross-section or in longitudinal section, in which the coating slip is also supplied from an application chamber 42 via a mouth 44 thereof to a pressure chamber which is arranged on the coating blade 4 and counter-roller 2 becomes.
  • the material web which is guided by the counter-roller 2, or the roller surface itself is coated with the coating slip in the pressure chamber, which is metered and smoothed by the coating blade 4.
  • the necessary excess portion of the coating slip flows via the openings or the channel 47 of the front wall 41 which delimits the pressure space on the inlet side of the web or the roller surface to the throttle point, which is through the throttle slide 24 with the throttle openings 25 or the throttle strip 21 with the throttle openings 22 is formed, too.
  • the front wall 41 still preferably forms a throttle gap 43 on the counter-roller 2, which has such a strong throttling effect that only an extremely small amount of coating slip flows out here.
  • a well-acting metering device is obtained, which produces a relatively smooth, trouble-free line with a relatively simple structure of the arrangement.
  • Lateral side seals, which are to be arranged at the ends of the counter roller, are also easy to attach here.
  • the throttle slide or the parts of the throttle device are fixed by a clamping strip 46 on the front wall 41.
  • the shifting devices as well as slide 24 are not shown here.
  • the doctor blade 4 is clamped in via an extension of the wall 48 of the application chamber 42 and a clamping lever 49.
  • the direction of movement of the counter roller is also indicated by an arrow.
  • the application layer can then be transferred to a paper web, see e.g. US-A 48 48 268.

Landscapes

  • Coating Apparatus (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Finger-Pressure Massage (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Seal Device For Vehicle (AREA)
  • Glass Compositions (AREA)

Abstract

In the coating device, a covering body (1) is provided at the mouth (11) emerging from the chamber for the coating compound (10), between said mouth and the counter-roller or material web, said covering body forming, at its surface facing the mouth (11), an outlet channel (7) which leads away from the space (9) through which flows the coating compound at the coating blade (4). This outlet channel has a throttling action. Furthermore, the covering body (1) forms, with respect to the coating blade (4), a second throttling channel (8) located relatively close to the coating edge of the coating blade (4). The covering body (1) preferably ends at the outlet end of the second throttling channel (8) in a tip (16) arranged relatively close to the counter-roller or material web. Advantageously, the outlet channel (7) can be formed between a base body (5) and the covering body (1), the base body (5) ending at a distance from the coating blade (4) at most 10 mm greater than the clear width (e) of the second throttling channel (8). <IMAGE>

Description

Die Erfindung betrifft eine Streicheinrichtung nach dem Oberbe­griff des Patentanspruchs 1. Eine solche Streicheinrichtung ist bekannt aus der DE-C 35 13 063. Bei dieser Streicheinrichtung ist an der Streichklinge und der die Warenbahn führenden Gegen­walze ein relativ großer weiträumiger Auftragsraum vorgesehen, der an der Einlaufseite der Warenbahn durch eine Vorderwand be­grenzt ist, die Auslaßöffnungen aufweist. Diese Vorderwand er­streckt sich fast bis zur Berührung mit der Gegenwalze zu der­selben hin. Über den Sinn und Zweck dieser Auslaßöffnungen ist nichts in der Schrift ausgeführt.The invention relates to a coating device according to the preamble of claim 1. Such a coating device is known from DE-C 35 13 063. In this coating device, a relatively large, spacious application space is provided on the coating blade and the counter roller guiding the web, which is on the inlet side the web is delimited by a front wall which has outlet openings. This front wall extends almost to the point where it touches the counter roll. Nothing is stated in the scriptures about the meaning and purpose of these outlet openings.

Die Aufgabe der Erfindung ist es, bei solchen oder ähnlichen Streicheinrichtungen (siehe auch deutsche Anmeldung P 36 12 248), die Qualität des aufgetragenen Strichs hinsicht­lich Gleichmäßigkeit zu verbessern. Wegen der hohen Bahnge­schwindigkeiten scheint es bei den bisher bekannten Auftragsein­richtungen der gattungsgemäßen Art schwierig zu sein, auftreten­de Turbulenzen in der Streichmasse zu verhindern.The object of the invention is to improve the quality of the applied stroke with regard to uniformity in such or similar coating devices (see also German application P 36 12 248). Because of the high web speeds, it seems to be difficult with the previously known application devices of the generic type to prevent turbulence occurring in the coating slip.

Die genannte Aufgabe wird erfindungsgemäß durch die kennzeich­nenden Merkmale des Patentanspruchs 1 gelöst.According to the invention, this object is achieved by the characterizing features of patent claim 1.

Nachfolgend wird die Erfindung anhand mehrerer in der Zeichnung dargestellte Ausführungsbeispiele erläutert.The invention is explained below using several exemplary embodiments shown in the drawing.

Dabei stellt:

  • Fig. 1 prinzipmäßig einen Querschnitt durch die erfin­dungsgemäaße Streicheinrichtung,
  • Fig. 2 eine andere Ausführungsform einer ähnlichen Dar­stellung,
  • Fig. 3 eine wieder andere Ausführungsform,
  • Fig. 4 eine wieder andere Ausführungsform mit einem Dros­selschieber,
  • Fig. 5 teilweise einen Längsschnitt zu Figur 4 gemäß dor­tiger Schnittangabe,
  • Fig. 6 eine Ausführungsform ähnlich Figur 2 und
  • Fig. 7 und 7a eine solche ähnlich Figur 4 und 5 dar.
Here:
  • 1 shows in principle a cross section through the coating device according to the invention,
  • 2 shows another embodiment of a similar representation,
  • 3 shows yet another embodiment,
  • 4 shows another embodiment with a throttle valve,
  • 5 shows a partial longitudinal section to FIG. 4 in accordance with the section information there,
  • Fig. 6 shows an embodiment similar to Figure 2 and
  • 7 and 7a represent such a similar to Figures 4 and 5.

Die Warenbahn wird von der Gegenwalze 2 im Bereich der Streichklinge 4 geführt. Die Streichmasse gelangt aus der Kammer 10 über den Mündungskanal 11′ zur Mündung 11 und von dort zur Streichklinge 4. Die Streichmasse wird mit einem gewissen Über­schuß zugeführt, die jedoch in diesem Fall wesentlich kleiner sein kannn als bei den bisher bekannten Streicheinrichtungen. Eine obere Platte 1 als Deckkörper bildet gegenüber der Streich­klinge 4 den Drosselspalt 8 von einer Weite (Breite) zwischen 3 und 15 mm, vorzugsweise zwischen 5 und 8 mm. Die Länge dieses Kanals beträgt zwischen 5 und 25 mm, vorzugsweise zwischen 5 und 15 mm. Die Spitze 16 der Platte 1 (also die höchstens mit einem Radius von 1 mm abgerundete, der Gegenwalze 2 nahe Kante) ist von der Gegenwalze 2 etwa 3 bis 10 mm entfernt. Die Platte 1 bildet mit einer weiteren Platte 5 als Basis-Deckkörper einen vom Auftragsraum 9 an der Streichklinge 4, wo die Streichmasse von der Mündung 11 zur Abstreifkante der Streichklinge fließt, wegführenden, weiteren Drosselkanal (Abflußkanal) 7, der sich hier im wesentlichen im Bereich zwischen der Mündung 11 und der vorderen Begrenzungswand 13 der Mündung 11 bzw. des Mündungska­nals 11′ und der Kammer 10 erstreckt. Seine Höhe beträgt etwa zwischen 3 und 6 mm und seine Länge im wesentlichen zwischen dem Zehn- und Zwanzigfachen der angegebenen Höhe.The material web is guided by the counter roller 2 in the area of the coating blade 4. The coating slip passes from the chamber 10 via the mouth channel 11 'to the mouth 11 and from there to the coating blade 4. The coating slip is supplied with a certain excess, which in this case, however, can be significantly smaller than in the previously known coating devices. An upper plate 1 as a cover body forms the throttle gap 8 with a width (width) of between 3 and 15 mm, preferably between 5 and 8 mm, relative to the coating blade 4. The length of this channel is between 5 and 25 mm, preferably between 5 and 15 mm. The tip 16 of the plate 1 (that is to say the edge which is rounded at most with a radius of 1 mm and is close to the counter roller 2) is approximately 3 to 10 mm away from the counter roller 2. The plate 1 forms with a further plate 5 as a base cover body from the application space 9 on the doctor blade 4, where the coating compound flows from the mouth 11 to the scraper edge of the doctor blade, leading further throttle channel (drain channel) 7, which is essentially here Area between the mouth 11 and the front boundary wall 13 of the mouth 11 or the mouth channel 11 'and the chamber 10 extends. Its height is approximately between 3 and 6 mm and its length is essentially between ten and twenty times the specified height.

Die Drosselkanäle sind in Schnitten parallel zur Mittellängsach­se der Gegenwalze 2 praktisch schlitzförmig, weil sie in dieser Richtung eine Gesamtlänge entsprechend der Länge der Gegenwalze haben, die z.B. bei 8 m Länge der Gegenwalze 2 und einer Kanal-­(Schlitz)-Hohe von 5 oder 8 mm (siehe z.B. "e") letztere um Größenordnungen übertrifft (siehe z.B. auch Fig. 5).The throttle ducts are practically slit-shaped in sections parallel to the central longitudinal axis of the counter-roller 2, because in this direction they have an overall length corresponding to the length of the counter-roller, for example 8 m in length of the counter-roller 2 and a channel (slot) height of 5 or 8 mm (see for example "e") exceeds the latter by orders of magnitude (see for example also FIG. 5).

Vorzugsweise befindet sich zwischen der Rückwand 17 des Mün­dungskanals 11, und der zweiten Platte 5 im Bereich derselben eine Verengungsstelle 18. Man kann dadurch den Fluß der Streich­masse noch mehr vergleichmäßigen.There is preferably a constriction point 18 between the rear wall 17 of the orifice channel 11 and the second plate 5 in the region of the same. The flow of the coating slip can thereby be made even more uniform.

Durch den zweiten Drosselkanal 7 fließt im wesentlichen die im Überschuß zugeführte Menge der Streichmasse ab.Through the second throttle channel 7, the excess amount of the coating slip flows off.

Es kann ebenso gut auch die Auftragskammer die Streichmasse direkt der Walze 2 zuführen, die dann in einem anderen Bereich von der Warenbahn umschlungen oder berührt ist, in welchem dann die Übertragung der Streichmasse auf die Warenbahn erfolgt.It is equally possible for the application chamber to feed the coating slip directly to the roller 2, which is then wrapped or touched by the material web in another area, in which the coating material is then transferred to the material web.

In Figur 2 ist der Vollständigkeit halber noch eine andere mög­liche Ausführungsform von Basiskörper und Deckkörper darge­stellt. Die Bezugszeichen sind jeweils mit einem zusätzlichen Apostroph versehen. Die Drosselkanäle erfüllen dabei jeweils die gestellten Bedingungen. Auch das Merkmal des Anspruchs 2 ist er­füllt.For the sake of completeness, FIG. 2 shows yet another possible embodiment of the base body and cover body. The reference symbols are each provided with an additional apostrophe. The throttle channels each meet the conditions. The feature of claim 2 is also fulfilled.

In Figur 3 ist dargestellt, daß als Rakelelement auch eine Roll­rakel 30 in Frage kommt, die in einem Rakelbett 31 drehbar ge­führt ist, welches an einer als Blattfeder ausgeführten Tragfe­der 32 in der Rakel-Klemmhalterung 33, 34 befestigt ist. Dort wird von dem Deckkörper 1‴ der zweite Drosselkanal 8‴ gegen­über der Rakelhalterung 31 der Rollrakel 30 gebildet.In FIG. 3 it is shown that a doctor blade 30 can also be used as a doctor element, which is rotatably guided in a doctor bed 31, which is fastened to a support spring 32 designed as a leaf spring in the doctor clamp holder 33, 34. There, the second throttle channel 8 ‴ is formed by the cover body 1 ‴ opposite the doctor holder 31 of the roller doctor 30.

In Figur 4 und 5 ist gezeigt, daß der Drosselkanal 7‴ durch einen Drosselschieber 21 mit Drosselfenstern 22 in seiner Dros­selstärke gesteuert werden kann. Jedem Schieber ist eine Dros­selleiste 24 mit entsprechenden Fenstern 25 zugeordnet. Die Drosselwirkung des Drosselkanals kann auch im wesentlichen al­lein auf der Wirkung dieses Schiebers 21 beruhen. Diese Ausfüh­ rungsform läßt sich natürlich in sehr umfassender Weise an die verschiedensten Verhältnisse des Streichprozesses, z.B. auch die Parameter der Streichmasse wie z.B. deren Konsistenz, anpassen.In Figures 4 and 5 it is shown that the throttle channel 7 ‴ can be controlled by a throttle slide 21 with throttle windows 22 in its throttle strength. A throttle strip 24 with corresponding windows 25 is assigned to each slide. The throttling action of the throttle channel can also be based essentially solely on the action of this slide 21. This execution The shape of the coating can of course be adapted in a very comprehensive manner to the most varied conditions of the coating process, for example also the parameters of the coating composition, such as, for example, their consistency.

In Fig. 6 ist eine weitere Variante der erfindungsgemäßen Anord­nung dargestellt, wobei der Deckkörper 36 direkt mit einer sehr dick ausgebildeten Vorderwand 43 der Mündung 41 der Kammer 50 für die Streichmasse den ersten Drosselkanal 37 bildet. Dies ist dann besonders vorteilhaft, wenn gerade diese Vorderwand 43 ein wesentlich tragendes Bauteil der Streicheinrichtung bzw. des Tragbalkens für die Streichklinge 4 bildet. Strichpunktiert ist dort dargestellt, wie durch einen nasenförmigen Vorsprung 44 der Vorderwand 43 eine Verengungsstelle am Austritt des Mündungska­nals 41 gebildet werden kann.6 shows a further variant of the arrangement according to the invention, the cover body 36 forming the first throttle duct 37 directly with a very thick front wall 43 of the mouth 41 of the chamber 50 for the coating slip. This is particularly advantageous if this front wall 43 forms a substantially load-bearing component of the coating device or of the support beam for the coating blade 4. Dash-dotted lines show how a constriction point at the outlet of the outlet channel 41 can be formed by a nose-shaped projection 44 of the front wall 43.

Es ist üblich, die Streichklinge 4 durch ein in ihrem freien Be­reich angreifendes Druckstück einzustellen, das längs der Achse der Gegenwalze bzw. der Breite der Papierbahn auch unterteilt sein kann, um unterschiedliche Preßdrücke auf die Streichklinge 4 auszuüben. Dadurch kommt es zu einer Durchbiegung derselben, so daß der zweite Drosselkanal 8, 8′, 8˝ usw. ziemlich stark in seiner Dimension verändert werden könnte. Dies wird dann ausge­schlossen, wenn man eine Streicheinrichtung anwendet, bei der der Anliegewinkel der Streichklinge 4 an der Gegenwalze bzw. Pa­pierbahn durch entsprechende Schwenkverhältnisse konstantgehal­ten wird. Eine solche Einrichtung ist u.a. bekanntgeworden aus der US-PS 46 37 338. Noch verschiedene andere konstruktive Mög­lichkeiten in dieser Hinsicht sind bekannt. Bei diesen Einrich­tungen wird der Tragbalken samt der Kammer für die Streichmasse einschließlich deren Mündung in die Auftragszone und damit auch der Deckkörper und gegenbenenfalls der Basiskörper in gleichem Maße mitgeschwenkt, wie sich die Winkellage der Einspannung der Streichklinge ändert. Dadurch bleiben die Verhältnisse im we­sentlichen auch im Bereich des zweiten Drosselkanals bei allen Betriebszuständen erhalten, so daß sich die Dimensionen des zwe­iten Drosselkanals dabei nicht wesentlich ändern.It is customary to adjust the doctor blade 4 by means of a pressure piece engaging in its free area, which can also be divided along the axis of the counter roller or the width of the paper web in order to exert different pressures on the doctor blade 4. This leads to a deflection of the same, so that the second throttle channel 8, 8 ', 8˝ etc. could be changed quite greatly in its dimension. This is excluded if a coating device is used in which the contact angle of the coating blade 4 on the counter roller or paper web is kept constant by appropriate swivel conditions. Such a device has become known, inter alia, from US Pat. No. 4,637,338. Various other design options in this regard are known. In these devices, the support beam including the chamber for the coating compound including its mouth into the application zone and thus also the cover body and, if appropriate, the base body is pivoted to the same extent as the angular position of the clamping of the coating blade changes. As a result, the conditions in the area of the second throttle duct remain essentially with everyone Obtain operating conditions so that the dimensions of the second throttle channel do not change significantly.

In Fig. 7 bzw. Fig. 7a ist im Querschnitt bzw. im Längsschnitt eine Anordnung dargestellt, bei der auch aus einer Auftragskam­mer 42 aus über eine Mündung 44 derselben einem Druckraum, der an der Streichklinge 4 und Gegenwalze 2 angeordnet ist, die Streichmasse zugeleitet wird. Somit wird auch hier die Waren­bahn, die von der Gegenwalze 2 geführt wird, oder die Walzen­oberfläche selbst mit der Streichmasse in dem Druckraum be­schichtet, welche durch die Streichklinge 4 dosiert und geglät­tet wird. Der nötige Überschußanteil der Streichmasse fließt über die öÖffnungen bzw. den Kanal 47 der den Druckraum an der Einlaufseite der Warenbahn oder der Walzenoberfläche begrenzen­den Vorderwand 41 zu der Drosselstelle, die durch den Drossel­schieber 24 mit den Drosselöffnungen 25 bzw. die Drosselleiste 21 mit den Drosselöffnungen 22 gebildet ist, zu. Dadurch kann der Überschuß an Streichmasse auf gesteuerte Weise aus dem Druckraum 45 abgeleitet werden. Die Vorderwand 41 bildet noch vorzugsweise an der Gegenwalze 2 einen Drosselspalt 43, der eine so starke Drosselwirkung hat, daß hier nur eine äußerst geringe Menge an Streichmasse herausfließt. Man erhält auf diese Weise eine gut wirkende Dosiereinrichtung, die einen relativ glatten, störungsfreien Strich erzeugt bei relativ einfachem Aufbau der Anordnung. Hier sind auch seitliche, an den Enden der Gegenwalze anzuordnende Seitendichtungen gut anzubringen.In Fig. 7 and Fig. 7a, an arrangement is shown in cross-section or in longitudinal section, in which the coating slip is also supplied from an application chamber 42 via a mouth 44 thereof to a pressure chamber which is arranged on the coating blade 4 and counter-roller 2 becomes. Thus, here too the material web, which is guided by the counter-roller 2, or the roller surface itself is coated with the coating slip in the pressure chamber, which is metered and smoothed by the coating blade 4. The necessary excess portion of the coating slip flows via the openings or the channel 47 of the front wall 41 which delimits the pressure space on the inlet side of the web or the roller surface to the throttle point, which is through the throttle slide 24 with the throttle openings 25 or the throttle strip 21 with the throttle openings 22 is formed, too. As a result, the excess coating slip can be drained from the pressure chamber 45 in a controlled manner. The front wall 41 still preferably forms a throttle gap 43 on the counter-roller 2, which has such a strong throttling effect that only an extremely small amount of coating slip flows out here. In this way, a well-acting metering device is obtained, which produces a relatively smooth, trouble-free line with a relatively simple structure of the arrangement. Lateral side seals, which are to be arranged at the ends of the counter roller, are also easy to attach here.

Der Drosselschieber bzw. die Teile der Drosselvorrichtung werden durch eine Klemmleiste 46 an der Vorderwand 41 festgelegt. Die Verschiebeeinrichtungen genauso Schieber 24 sind hier nicht dar­gestellt. Die Einklemmung der Streichklinge 4 erfolgt über einen Fortsatz der Wand 48 der Auftragskammer 42 sowie einen Klemmhe­bel 49. Der Vollständigkeit halber ist noch die Bewegungsrich­tung der Gegenwalze durch einen Pfeil gekennzeichnet.The throttle slide or the parts of the throttle device are fixed by a clamping strip 46 on the front wall 41. The shifting devices as well as slide 24 are not shown here. The doctor blade 4 is clamped in via an extension of the wall 48 of the application chamber 42 and a clamping lever 49. For the sake of completeness, the direction of movement of the counter roller is also indicated by an arrow.

Wird mit der Erfindungsgemäßen Einrichtung zunächst die Walzen­oberfläche beschichtet, kann die Auftragsschicht danach auf eine Papierbahn übertragen werden, siehe z.B. US-A 48 48 268.If the roller surface is first coated with the device according to the invention, the application layer can then be transferred to a paper web, see e.g. US-A 48 48 268.

Claims (14)

1. Beschichtungseinrichtung, insbesondere Streicheinrichtung für laufende Warenbahnen aus Papier oder Karton, wobei an die Warenbahn im Bereich einer diese führenden Gegenwalze oder direkt an der Gegenwalze eine Streichklinge oder Roll­rakel angreift und eine Auftragskammer für die Streichmasse vorgesehen ist, in welcher die Streichmasse unter einem überatmosphärischen Druck gehalten wird, und aus der die Streichmasse über eine parallel zur Warenbahn bzw. Gegenwal­ze über die Breite der Warenbahn sich erstreckende Mündung der Warenbahn oder Gegenwalze bzw. Streichklinge oder Roll­rakel zuführbar ist, dadurch gekennzeichnet, daß mindestens ein Deckkörper (1, 1′, 1˝, 1‴; 5, 5′, 5˝; 35) nahe der Ge­genwalze zwischen dieser und der Mündung (11) angeordnet ist, der einen unter überatmosphärischem Druck stehenden Auftragsraum (9) an der Streichklinge (4) bzw. der Rakelhal­terung (31, 32) bildet, der im wesentlichen durch den der Gegenwalze am nächsten angeordneten Deckkörper (1, 1′, 1˝, 1‴) von dieser abgeschottet ist und der (bzw. die) einen von dem an der Streichklinge (4) oder Rakelhalterung (32) gebildeten, von der Streichmasse durchströmten Auftragsraum (9) wegführenden, im Schnitt parallel zur Mittel-Längsachse der Gegenwalze schlitzförmigen Abflußkanal oder entsprechend über die Länge der Gegenwalze verteilte Abflußkanäle (7; 7′; 7˝; 7‴; 22, 37) mit Drosselwirkung und gegenüber der Streichklinge (4) bzw. der Rakelhalterung (31) einen zwei­ten, im Schnitt parallel zur Mittel-Längsachse der Gegen­walze schlitzförmigen Drosselkanal (8, 8′, 8˝, 8‴) bzw. Drosselstelle bildet (bzw. bilden).1. Coating device, in particular coating device for running webs of paper or cardboard, wherein a coating blade or roller doctor acts on the web in the area of a counter-roller carrying this or directly on the counter-roller and an application chamber for the coating composition is provided, in which the coating composition is exposed to a superatmospheric Pressure is maintained, and from which the coating slip can be fed via a mouth of the fabric web or mating roller or doctor blade or roller squeegee that extends parallel to the fabric web or counter roller across the width of the fabric web, characterized in that at least one cover body (1, 1 ′, 1˝, 1 ‴; 5, 5 ', 5˝; 35) is arranged near the counter-roller between this and the mouth (11), which is a pressurized application space (9) on the doctor blade (4) or the squeegee holder (31, 32), which essentially consists of the cover body arranged closest to the counter roll he (1, 1 ′, 1˝, 1 ‴) is isolated from it and the (or )) a drainage channel (7) which runs away from the application space (9) formed on the coating blade (4) or doctor blade holder (32) and through which the coating slip flows and which is in section parallel to the central longitudinal axis of the backing roll or correspondingly distributed over the length of the backing roll ; 7 ';7˝; 7 ‴; 22, 37) with throttle action and opposite the doctor blade (4) or the squeegee holder (31) a second, slit-shaped throttle channel (8, 8', parallel to the central longitudinal axis of the counter-roller) 8˝, 8 ‴) or throttling point forms (or form). 2. Streicheinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der zweite Drosselkanal (8) eine Länge (f) in Strömungs­richtung entlang der Streichklinge bzw. Rakelhalterung zwi­schen 5 und 25 mm, vorzugsweise zwischen 5 und 15 mm, und eine Weite (e) zwischen 3 und 15 mm, vorzugsweise zwischen 5\und 8 mm, aufweist.2. Coating device according to claim 1, characterized in that the second throttle channel (8) has a length (f) in the flow direction along the doctor blade or doctor blade holder between 5 and 25 mm, preferably between 5 and 15 mm, and a width (e) between 3 and 15 mm, preferably between 5 \ and 8 mm. 3. Streicheinrichtung nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß ein Basiskörper (5) zwischen der Mündung (11) der Auftragskammer (10) oder deren Mündungskanal (11′) und dem Deckkörper (1, 1′, 1˝, 1‴) vorgesehen ist, wobei der Basiskörper (5, 5′, 5˝) und der Deckkörper mit ihren einan­der zugewandten Flächen den Austrittskanal (7; 7′; 7˝; 7‴; 22; 37) bilden.3. Coating device according to claim 1 or 2, characterized in that a base body (5) between the mouth (11) of the application chamber (10) or its mouth channel (11 ') and the cover body (1, 1', 1˝, 1 ‴ ) is provided, the base body (5, 5 ', 5˝) and the cover body with their mutually facing surfaces forming the outlet channel (7; 7'; 7˝; 7 ‴; 22; 37). 4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch ge­kennzeichnet, daß der Deckkörper (1) am Ende des mit der Streichklinge (4) oder Rakelhalters gebildeten, zweiten Drosselkanals (8) und im der Streichkante des Rakelelements nahen Bereich im wesentlichen mit einer Kante endet, deren Abrundungsradius höchstens 2, vorzugsweise etwa 1 mm beträgt und die sich von der Gegenwalze (2) in einem Abstand (s) zwischen 3 und 15 mm, vorzugsweise zwischen 5 und 10 mm, be­findet.4. Device according to one of claims 1 to 3, characterized in that the cover body (1) at the end of the with the coating blade (4) or doctor holder, the second throttle channel (8) and in the coating edge of the doctor element near area substantially with a Edge ends, the radius of curvature of which is at most 2, preferably about 1 mm, and which is at a distance (s) between 3 and 15 mm, preferably between 5 and 10 mm, from the counter-roller (2). 5. Einrichtung nach einem der Ansprüche 1 bis 4, dadurch ge­kennzeichnet, daß der Basiskörper (5) sich bis zur Streich­klinge (4) bzw. dem Rakelhalter in einer Entfernung er­streckt, die höchstens 10 mm größer ist als die Entfernung des Deckkörpers (1) von der Streichklinge (4) bzw. dem Ra­kelhalter und mindestens gleich ist der Weite (e) des zwei­ten Drosselkanals (8).5. Device according to one of claims 1 to 4, characterized in that the base body (5) extends to the doctor blade (4) or the doctor holder at a distance which is at most 10 mm larger than the distance of the cover body (1) of the doctor blade (4) or the doctor blade holder and the width (e) of the second throttle channel (8) is at least equal. 6. Einrichtung nach einem der Ansprüche 2 bis 5, dadurch ge­kennzeichnet, daß der Basiskörper (5) an seiner der Streich­klinge (4) bzw. dem Rakelhalter nahen Kante im Bereich des ersten Drosselkanals (7) mit einem Radius von mindestens 5 mm abgerundet ist.6. Device according to one of claims 2 to 5, characterized in that the base body (5) on its near the coating blade (4) or the doctor holder edge in the region of the first throttle channel (7) is rounded with a radius of at least 5 mm . 7. Einrichtung nach einem der Ansprüche 1 bis 6, dadurch ge­kennzeichnet, daß die Höhe (Weite) des ersten Drosselkanals (7) zwischen 3 und 6 mm beträgt.7. Device according to one of claims 1 to 6, characterized in that the height (width) of the first throttle channel (7) is between 3 and 6 mm. 8. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Länge des ersten Drosselkanals (7) das Zehn- bis Zwanzig­fache seiner Höhe beträgt.8. Device according to claim 7, characterized in that the length of the first throttle channel (7) is ten to twenty times its height. 9. Einrichtung nach einem der Ansprüche 1 bis 7, dadurch ge­kennzeichnet, daß der erste Drosselkanal (7′) mittels einem Drosselöffnungen (22) aufweisenden Drosselschieber (21) in der Drosselstärke regulierbar ist.9. Device according to one of claims 1 to 7, characterized in that the first throttle duct (7 ') by means of a throttle openings (22) having throttle slide (21) is adjustable in the throttle strength. 10. Streicheinrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Deckkörper (1), der Auslaßkanal (7) und der zweite Drosselkanal (8) sich im wesentlichen über die gesamte Länge der Streichklinge (4) bzw. der Rakelhalte­rung (31) erstrecken, wobei der Deckkörper (1) im wesent­lichen als eine Profilleiste oder Platte, platten- oder schalenförmig, ausgebildet ist, deren Entfernung sowohl von der Anliegekante der Streichklinge (4) bzw. der Rollrakel (30) als auch von der Gegenwalze mehr und mehr zunimmt mit mindestens 1 mm (Abstand von der Gegenwalze) je 10 mm Ent­fernung von der Anliegekante.10. Coating device according to one of claims 1 to 9, characterized in that the cover body (1), the outlet channel (7) and the second throttle channel (8) extend substantially over the entire length of the doctor blade (4) or the doctor blade holder ( 31) extend, the cover body (1) being designed essentially as a profiled strip or plate, plate or shell-shaped, the removal of which from the abutting edge of the coating blade (4) or the doctor blade (30) as well as from the counter roller more and more increases with at least 1 mm (distance from the counter roller) per 10 mm distance from the contact edge. 11. Streicheinrichtung für laufende Warenbahnen aus Papier oder Karton, wobei an die Warenbahn im Bereich einer diese füh­renden Gegenwalze oder direkt an der Gegenwalze eine Streich­klinge oder Rollrakel angreift und eine Auftragskammer für die Streichmasse vorgesehen ist, in welcher die Streichmasse unter einem überatmosphärischen Druck gehalten wird, und aus der die Streichmasse über eine parallel zur Warenbahn bzw. Gegenwalze über die Breite der Warenbahn sich erstreckende Mündung der Warenbahn oder Gegenwalze bzw. Streichklinge oder Rollrakel zuführbar ist, dadurch gekennzeichnet, daß aus dem hinter der Mündung (44) der Auftragskammer (42) zwi­schen einer Vorderwand (41) der Warenbahn bzw. Gegenwalze (2) und dem Rakelelement (4) gelegenen Druckraum (45) ein Kanal (47, 22) im Bereich der Vorderwand (41), also entgegen der Laufrichtung der Gegenwalze (2) zur Ableitung von Streichmasse aus dem Druckraum (45) vorgesehen ist.11. Coating device for running webs of paper or cardboard, wherein a coating blade or roller doctor acts on the web in the area of a counter-roller leading this or directly on the counter-roller and an application chamber for the coating slip is provided, in which the coating slip is kept under a superatmospheric pressure, and from which the coating slip can be fed via a mouth of the material strip or counter roller or coating blade or roller doctor that extends across the width of the material strip parallel to the material web or counter roller, thereby characterized in that a channel (47, 22) in the area from the pressure chamber (45) located behind the mouth (44) of the application chamber (42) between a front wall (41) of the web or counter roller (2) and the doctor element (4) the front wall (41), that is to say counter to the running direction of the counter-roller (2), is used to discharge coating slip from the pressure chamber (45). 12. Einrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die Vorderwand (41) an der Gegenwalze (2) einen Drosselspalt (43) bildet.12. The device according to claim 11, characterized in that the front wall (41) on the counter-roller (2) forms a throttle gap (43). 13. Einrichtung nach Anspruch 11 oder 12, dadurch gekennzeich­net, daß der Ableitkanal (47, 22) durch eine gesteuerte Drosselwirkung veränderbar ist.13. The device according to claim 11 or 12, characterized in that the discharge channel (47, 22) can be changed by a controlled throttle effect. 14. Einrichtung nach Anspruch 13, dadurch gekennzeichnet, daß zur Veränderung der Drosselwirkung ein Drosselschieber (Transversal- oder Drehschieber 21, 22, 24, 25) vorgesehen ist, dessen Drosselöffnungen (22) über die Länge der Vorder­wand (41) bzw. Breite der Gegenwalze (2) verteilt angeordnet sind.14. The device according to claim 13, characterized in that a throttle slide (transverse or rotary slide 21, 22, 24, 25) is provided to change the throttle effect, the throttle openings (22) over the length of the front wall (41) or width of the Counter roll (2) are arranged distributed.
EP90107009A 1989-06-22 1990-04-11 Coating device Expired - Lifetime EP0406529B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3920381 1989-06-22
DE3920381 1989-06-22
DE3942590A DE3942590C2 (en) 1989-06-22 1989-12-22 Coating device
DE3942590 1989-12-22

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EP0406529A2 true EP0406529A2 (en) 1991-01-09
EP0406529A3 EP0406529A3 (en) 1991-10-23
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JP (1) JPH0330862A (en)
AT (1) ATE107981T1 (en)
BR (1) BR9002989A (en)
CA (1) CA2019703A1 (en)
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JP4830843B2 (en) * 2006-12-21 2011-12-07 東洋紡績株式会社 Reaction cup container and reaction measurement instrument set
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EP0406529B1 (en) 1994-06-29
NO902079L (en) 1990-12-27
CA2019703A1 (en) 1990-12-22
FI902995A0 (en) 1990-06-14
EP0406529A3 (en) 1991-10-23
BR9002989A (en) 1991-08-20
NO902079D0 (en) 1990-05-10
JPH0330862A (en) 1991-02-08
US5078081A (en) 1992-01-07
ES2055823T3 (en) 1994-09-01
ATE107981T1 (en) 1994-07-15

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