WO2009043706A1 - Procédé de revêtement d'une bande de papier, de carton ou d'autre matériau fibreux en mouvement - Google Patents

Procédé de revêtement d'une bande de papier, de carton ou d'autre matériau fibreux en mouvement Download PDF

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Publication number
WO2009043706A1
WO2009043706A1 PCT/EP2008/062231 EP2008062231W WO2009043706A1 WO 2009043706 A1 WO2009043706 A1 WO 2009043706A1 EP 2008062231 W EP2008062231 W EP 2008062231W WO 2009043706 A1 WO2009043706 A1 WO 2009043706A1
Authority
WO
WIPO (PCT)
Prior art keywords
curtain
fibrous web
height
application
flow rate
Prior art date
Application number
PCT/EP2008/062231
Other languages
German (de)
English (en)
Inventor
Benjamin Dr. Méndez-Gallon
Original Assignee
Voith Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2009043706A1 publication Critical patent/WO2009043706A1/fr

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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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters

Definitions

  • the invention relates to a method for coating a running paper, cardboard or other fibrous web by means of at least one arranged above to be coated fibrous web curtain application nozzle from which at least one substantially gravity underlying free-falling curtain of a liquid to pasty application medium, in particular Coating color, in a certain flow rate and from a certain height to a surface located under the applicator unit is discharged, wherein for direct order, the said surface is the fibrous web itself and for indirect order said surface is a guide surface from which the application medium from a partial height is also delivered to the fibrous web in the form of a curtain.
  • the invention also relates to a device.
  • curtain application nozzles For coating a running paper, board or other fibrous web, curtain application nozzles, i. used so-called curtain coater.
  • curtain coater i. used so-called curtain coater.
  • the production of a single curtain (single-layer or multi-layered) Order) is usually easy if the flow rate from the respective curtain nozzle is greater than 41 / min / m.
  • the invention is therefore based on the object of specifying a curtain application method and a corresponding apparatus with which or with which a stable curtain can be reached at a low flow rate of the relevant curtain nozzle.
  • the object is achieved by a method according to claim 1.
  • the inventor has recognized that a stable curtain, despite a low flow rate, can be achieved even though the set curtain length or height from which the curtain falls is also low.
  • a height between Vorhangabgabedüse and fibrous web or between Vorhangabgabedüse and sliding surface
  • a partial height from the the curtain falls from a sliding surface on the fibrous web
  • the advantage is a set height between 1 and 5mm.
  • This method of the invention works with a simple curtain dispensed from a single jet as well as a multi-layer application.
  • multilayer coating is usually the last applied curtain the one who should have only a thin coating layer as a functional layer - for example, to produce a gloss effect - and thus results from a low flow rate.
  • the solids content of the application medium used can be high.
  • the stability of the low flow curtain can be further improved by creating an electrostatic field which acts on the curtain.
  • an electrostatic field which acts on the curtain.
  • a DC voltage between 3000 and 30,000 volts at currents between 100mA and 50OmA most effective.
  • the electrode which consists of at least one row of many individual electrodes for generating the electric field, can be arranged under the slide plate during indirect application or integrated into the plate itself.
  • the arrangement of the electrode under the fibrous web is useful.
  • the electrode assembly should be below the impact line of the curtain.
  • the baffle fulfills an important task, namely to concentrate and stabilize the individual, preferably thin, curtain films impinging on it (with the low flow rates mentioned, in the description of the method according to the invention, that is equal to or less than 10 l / min / m). Due to the formed composite of curtain films, it is possible to deliver such curtains in the specified flow rates at all.
  • the use of such a guide surface, which can also be referred to as an intermediate plate, is not without problems.
  • the guide surface must be able to guide the liquid or the curtain films homogeneously and without the formation of waves and stripes.
  • the recorded curtains or curtain films must not be slowed down so much, but they should not slide down too quickly, because wavy surfaces are formed and the quality of the job suffers.
  • the inventor has found that in addition to the already described low curtain length of preferably less than 5 mm, the use of suitable materials for the inclined baffle is also advantageous in terms of stable running of the one or more curtain films.
  • the materials used are stainless steel or plastic, e.g. Polyethylene, polypropylene proposed.
  • the guide surface may also be chromed or provided with a thin, conductive or non-conductive coating and / or with a water-repellent coating (lotus effect coating). The latter coating prevents contamination as well as a strong deceleration of the sliding film (s).
  • the guide surface or the inclined plate which may otherwise be formed straight or convex or concave, to produce a fine-pored material.
  • a gas or a lubricating fluid can be passed through, so that a bearing lubricating film is formed, on which the recorded curtain films or films can slide down with reduced friction.
  • the inclined plate may include tempering channels through which a cooling medium (e.g., gas, liquid) or even a heating medium (e.g., gas, vapor, liquid) may be passed through, thereby preventing caking by media parts.
  • a cooling medium e.g., gas, liquid
  • a heating medium e.g., gas, vapor, liquid
  • heating wires for heating and deflection compensation which can be arranged in the channels.
  • This embodiment allows a relatively small thickness of the inclined plate.
  • the inclined plate can be mounted on special suspensions in such a way that it can be targeted to a high-frequency oscillation state.
  • the direction of oscillation can be vertical as well as horizontal or else in the sliding direction of the curtain film or of the plurality of curtain films.
  • a covering of the sliding surface which prevents drying of the curtain film (s) on the sliding surface.
  • a regulation of the moisture in the space between the sliding surface and cover can be made by means of water mist or water vapor.
  • Figures 1 to 7 show a schematic representation of various embodiments of the device according to the invention
  • FIG. 1 shows an application device 1 with a single curtain applicator nozzle 2.
  • application medium M in particular coating color, with low flow rate, which is less than 61 / min / m as a gravity underlying curtain 3 on an underlying obliquely downward surface 4 delivered.
  • the surface here represents a guide surface 5 for the overlay 3 which forms the overlay 6 and which here compares itself.
  • This overlay 6 then also drops again substantially due to gravity at a spoiler edge 7 at the end of the inclined slide surface 5 in the form of another curtain 8 down to a running in the direction L, to be coated fibrous web 9 and forms there a very thin coating layer 10th
  • This type of order should be referred to as an indirect order.
  • a first height H1 is overcome by the curtain 3 or the application medium M (that is Here, the distance between the application nozzle to the surface 4 and the sliding surface 6) set low.
  • the height H1 is between 1 and 5mm.
  • the second height, which has to overcome the application medium following the sliding surface 5, should be referred to as partial height of fall TH2 and is greater than the height H1.
  • the partial height TH2 is about 50 to 300mm, preferably 150 to 250mm. This results in: H1 ⁇ TH2.
  • FIG. 2 shows an application device 1 a, which substantially corresponds to that shown in FIG. 1 and likewise works again indirectly, that is to say with the intervention of a surface 4 or a sliding surface 5.
  • Figure 1a In contrast to the device 1 of Figure 1 are in Figure 1a two parallel and height offset from one another arranged application nozzles 2a and 2b for dispensing two spaced apart individual curtains 3 and to form a double layer 11, consisting of a first medium M1 and a second medium M2 on the fibrous web 9 present.
  • the curtain application nozzle 2a first deposits the application medium M1 or its curtain 3a against the surface 4 or sliding surface 5 located underneath. There forms a lower layer 11 a, on which the discharged from the second application nozzle 2b medium M2 or the discharged curtain 3b hangs up.
  • the application medium M2 flows out of the curtain application nozzle 2b with a small flow rate, i. of below 6 ml / min / m and the set height H1 is as in the device 1 according to Figure 1 between 1 and 5mm, whereas the partial height of fall TH2 between the trailing edge 7 of the sliding surface 5 and the fibrous web between 50 and 300mm, preferably 150 to 250mm , is.
  • the height H3, the first curtain application nozzle 2a to the sliding surface 5 is about 50mm and is therefore greater than the height H1, which is present at the nozzle with the lower flow rate. Overall, a relationship follows as follows: H1 ⁇ H3 "TH2.
  • FIG. 3 likewise shows, as in FIG. 2, a multi-layer application device 1 b with, in the example, two existing curtain application nozzles 2 a and 2 b.
  • the application of the medium or two different media M1 and M2 takes place both directly and indirectly.
  • the medium M2 delivered here with a low flow rate Q of less than 6 l / min / m is stretched immediately after discharge from the nozzle 2b on the sliding surface 5 and only falls off the first time Trailing edge 7 of the sliding surface 5 as a curtain 3b, in a short height H1 between 0 and 5mm on the fibrous web.
  • the height H3 between the first directly applying the medium M1 for the lower layer 11 a applying curtain application nozzle 2a and the fibrous web 9 is about 50 to 300mm. Again, H1 ⁇ TH2.
  • FIG. 4 shows a device 1 c, which is also again for a multi-layer application, i. a double layer 11 is formed.
  • this device works with its two curtain application nozzles 2a and 2b exclusively in a direct manner.
  • a thin cover layer 11 b is applied again, i. the flow rate Q is again below 6l / min / m. Consequently, the height H1 to be set between nozzle 2b and surface 4 or fibrous web 9 is low. It is again only between 1 and 5mm. Since the applied lower layer 11 a, applied with the first nozzle 2 a, thicker than the cover layer 11 b should be, here the flow rate Q is also higher and is about 6 to 501 / min / m. Therefore, the height H3 is between 50 and 300mm. Again, a relationship applies: H1 ⁇ H3.
  • FIG. 5 shows an indirectly applying device 1d, which in principle corresponds to that of FIG. So that the curtain 3, which is very thin and prone to failure due to the low flow rate Q of equal or preferably below 61 / min / m, an electrode is provided here.
  • a plurality of electrodes 12 are present, which are distributed along the width of the device and at least over the width of the curtain 3.
  • the electrode or the plurality of electrodes 12 is aligned below the sliding surface 5 and towards the curtain 3.
  • an electrostatic field 13 is generated by an applied DC voltage up to 30,000 volts and a current of up to 100 mA.
  • the thin curtain 3 ie, the medium delivered in a low flow rate
  • the sliding surface 5 is made of a plastic or of a non-conductive material.
  • FIG. 6 shows an indirectly applied device 1 e with an arrangement of the electrode 12 that has been modified compared with FIG. 5.
  • This electrode 12 consists here of a metallic wire which is embedded in the sliding surface 5 consisting of plastic or nonconductive material.
  • FIG. 7 shows a directly applying device 1f.
  • the electrode or the plurality of electrodes 12 is arranged below the fibrous web 9 and in the direction of the sensitive and due to the lower
  • Fiber web 9 should be to form the electric field 13 a
  • an electrode assembly 12 is also possible with multilayer curtain application, as has been shown in Figures 2 to 4.
  • the electrodes are assigned to the application nozzle or the curtain, which is discharged in the said low flow rate.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

L'invention concerne un procédé de revêtement d'une bande (9) de papier, de carton ou d'autre matériau fibreux en mouvement, à l'aide d'au moins une buse d'application en rideau (2, 2a, 2b) disposée au-dessus de la bande de matériau fibreux à revêtir, à partir de laquelle au moins un rideau (3) de fluide d'application (M1, M2) liquide à pâteux, notamment de peinture, chutant librement, essentiellement sous l'effet de la gravité, est appliqué à un débit défini (Q) et à partir d'une hauteur définie (H1, H3), sur une surface (4) située sous le dispositif d'application. En cas d'application directe, ladite surface (4) est la bande de matériau fibreux (9), et en cas d'application indirecte, ladite surface (4) est une surface de guidage (5) à partir de laquelle le fluide d'application (M1, M2) est appliqué sur la bande de matériau fibreux (9), également sous forme de rideau (8), à partir d'une hauteur de chute partielle (TH2). Selon l'invention, en cas de débit (Q) faible, c'est à dire en cas de débit inférieur ou égal à 6l/min/m, notamment inférieur ou égal à 4l/min/m, un écart entre la buse d'application en rideau (2, 2a, 2b) et la surface (4) située en dessous, ou une hauteur (H1, H3) du rideau (3) chutant librement, est réglé inférieur ou égal à 10 mm. L'invention concerne également un dispositif destiné à la mise en oeuvre du procédé.
PCT/EP2008/062231 2007-09-27 2008-09-15 Procédé de revêtement d'une bande de papier, de carton ou d'autre matériau fibreux en mouvement WO2009043706A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007000780.0 2007-09-27
DE200710000780 DE102007000780A1 (de) 2007-09-27 2007-09-27 Verfahren zum Beschichten einer laufenden Papier-, Karton- oder anderen Faserstoffbahn

Publications (1)

Publication Number Publication Date
WO2009043706A1 true WO2009043706A1 (fr) 2009-04-09

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PCT/EP2008/062231 WO2009043706A1 (fr) 2007-09-27 2008-09-15 Procédé de revêtement d'une bande de papier, de carton ou d'autre matériau fibreux en mouvement

Country Status (2)

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DE (1) DE102007000780A1 (fr)
WO (1) WO2009043706A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH435048A (de) * 1966-02-17 1967-04-30 Steinemann Ulrich Ag Verfahren zum Überziehen von Werkstücken und Schlitzgiesseinrichtung zur Durchführung des Verfahrens
US3432293A (en) * 1966-01-06 1969-03-11 Glacier Metal Co Ltd Bearing materials and method of making same
BE852751A (fr) * 1976-03-23 1977-09-22 Du Pont Procede et appareil pour le revetement de pellicules
EP0051238A2 (fr) * 1980-11-05 1982-05-12 Agfa-Gevaert AG Procédé pour appliquer au moins une couche sur un support
EP0275015A2 (fr) * 1987-01-13 1988-07-20 Agfa-Gevaert AG Procédé de revêtement en rideau
DE9317347U1 (de) * 1993-11-12 1994-02-10 Robert Bürkle GmbH & Co, 72250 Freudenstadt Gießvorrichtung zum Beschichten von Teilen
EP0728532A1 (fr) * 1995-02-25 1996-08-28 Kodak Limited Procédé de revêtement au rideau
DE10057732A1 (de) * 2000-11-22 2002-05-23 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung
JP2003170097A (ja) * 2001-12-06 2003-06-17 Konica Corp 同時重層塗布用スライド型コータと当該同時重層塗布用スライド型コータを用いた記録材料の製造方法
EP1389647A1 (fr) * 2002-08-12 2004-02-18 Voith Paper Patent GmbH Appareil pour l'application d'un médium de couchage sur un substrat en mouvement
WO2006069851A1 (fr) * 2004-12-23 2006-07-06 Voith Patent Gmbh Procede pour appliquer directement plusieurs couches sur une bande en mouvement constituee de papier, de carton ou d'autre matiere fibreuse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4746894B2 (ja) 2005-03-14 2011-08-10 ボイス ペ−パ− パテント ゲ−エムベ−ハ− 塗工装置
DE102007009702A1 (de) 2007-02-28 2008-09-04 Voith Patent Gmbh Verfahren zur Herstellung einer beschichteten Faserstoffbahn, insbesondere aus Papier oder Karton

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3432293A (en) * 1966-01-06 1969-03-11 Glacier Metal Co Ltd Bearing materials and method of making same
CH435048A (de) * 1966-02-17 1967-04-30 Steinemann Ulrich Ag Verfahren zum Überziehen von Werkstücken und Schlitzgiesseinrichtung zur Durchführung des Verfahrens
BE852751A (fr) * 1976-03-23 1977-09-22 Du Pont Procede et appareil pour le revetement de pellicules
EP0051238A2 (fr) * 1980-11-05 1982-05-12 Agfa-Gevaert AG Procédé pour appliquer au moins une couche sur un support
EP0275015A2 (fr) * 1987-01-13 1988-07-20 Agfa-Gevaert AG Procédé de revêtement en rideau
DE9317347U1 (de) * 1993-11-12 1994-02-10 Robert Bürkle GmbH & Co, 72250 Freudenstadt Gießvorrichtung zum Beschichten von Teilen
EP0728532A1 (fr) * 1995-02-25 1996-08-28 Kodak Limited Procédé de revêtement au rideau
DE10057732A1 (de) * 2000-11-22 2002-05-23 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung
JP2003170097A (ja) * 2001-12-06 2003-06-17 Konica Corp 同時重層塗布用スライド型コータと当該同時重層塗布用スライド型コータを用いた記録材料の製造方法
EP1389647A1 (fr) * 2002-08-12 2004-02-18 Voith Paper Patent GmbH Appareil pour l'application d'un médium de couchage sur un substrat en mouvement
WO2006069851A1 (fr) * 2004-12-23 2006-07-06 Voith Patent Gmbh Procede pour appliquer directement plusieurs couches sur une bande en mouvement constituee de papier, de carton ou d'autre matiere fibreuse

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