EP3006115B1 - Procede et dispositif destines au revetement de rideau - Google Patents

Procede et dispositif destines au revetement de rideau Download PDF

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Publication number
EP3006115B1
EP3006115B1 EP15002751.4A EP15002751A EP3006115B1 EP 3006115 B1 EP3006115 B1 EP 3006115B1 EP 15002751 A EP15002751 A EP 15002751A EP 3006115 B1 EP3006115 B1 EP 3006115B1
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EP
European Patent Office
Prior art keywords
curtain
free
paper
jet
board web
Prior art date
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Active
Application number
EP15002751.4A
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German (de)
English (en)
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EP3006115A1 (fr
Inventor
Eduard Davydenko
Andreas Pesch
Thomas Hoffmann
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Andritz Kuesters GmbH
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Andritz Kuesters GmbH
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Publication of EP3006115A1 publication Critical patent/EP3006115A1/fr
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    • 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
    • B05C5/005—Curtain 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
    • 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
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work

Definitions

  • the invention relates to a method and a device for curtain coating according to the preamble of claim 1 and claim 11.
  • the coating When coating a paper or board web with a curtain applicator, the coating should be applied as evenly as possible over the entire web width in order to make good use of the advantages of contactless application.
  • the application thickness must be as constant as possible over the entire web surface. The basic prerequisite for this is a uniform distribution of the coating over the outlet width with regard to the volume flow and the speed.
  • the Curtain Coater can be used with a slot die or a cascade die.
  • a slot die slot-fed die
  • the curtain applicators with a slot nozzle are for example off DE 197 16 647 A1 and DE 10 2005 017 547 A1 known.
  • the cascade nozzles (Slide-Fed Die) are used in the multilayer web coating.
  • the coating material first flows from a distribution chamber upwards to the outlet gap. From the exit slit, the coating material flows on an inclined plane, where it is superimposed with the coating slips of the upper layers and then passed to the nozzle lip. Only at the trailing edge of the nozzle lip forms a curtain.
  • the cascade nozzles are described for example in WO 01/54828 A1 and WO 2005/024133 A1 ,
  • the curtain is accelerated in free fall due to gravity. As the distance from the exit edge of the nozzle increases, the curtain is drawn from the edges to the center by the action of gravity and surface tension. The width of the curtain is thereby narrower. In order to prevent the curtain from contracting, the curtain is guided by means of edge guiding elements at the edges.
  • the width of the curtain can be greater than the web width in a so-called overboard mode.
  • values of about 100 to 200 mm may be mentioned here.
  • a simple embodiment of the edge guide elements is generally sufficient in order to ensure a high uniformity of the distribution of the coating compound in the edge region.
  • a disadvantage is the adhesion of coating material to the underside of the paper or board web, as a result of which undesired contamination in the area of the coating zone occurs.
  • the width of the curtain is less than or equal to the web width.
  • the coating color in the edge area and in the middle must be distributed very evenly over the width of the web. It is important that the curtain hits the moving paper or board web at the same speed throughout the impact zone. Otherwise, there would be problems with the coating of the paper or board web in the form of edge beads and not dried edges.
  • edge guide elements for the inboard driving style are described for example in EP 0 907 103 A1 .
  • EP 1 458 493 A1 and WO 02/081103 A1 are described for example in EP 0 907 103 A1 .
  • EP 2 067 531 A2 EP 1 458 493 A1 and WO 02/081103 A1 ,
  • EP 0 737 521 A2 describes a method and apparatus for reducing curtain screen disturbances.
  • the curtain edge is separated by a free jet of a separating liquid. Since the free jet in the puncture area also withdraws liquid from the curtain, no bead-shaped edge forms on the base. It is therefore even possible to uniformly thick coat to the outermost edge of the pad.
  • the water jet for a separation process is used, as is known for example from the water jet cutting of solids.
  • the disadvantage is that coating compounds with a high elasticity can not be separated by such water jet cutting.
  • the separating elements described above are therefore to be used in order to avoid the formation of a bead in the edge region, which otherwise results in that comparatively much coating color is applied to the edge. This would have As a result, the guide rollers and Airturns become soiled with paint. The bead of paint can be dried badly. The individual layers of paper stick together on the spool. Due to the disadvantageous adhesion of the coating color to the separating elements, such aids are maintenance-intensive and susceptible to wear.
  • Out DE 10 2005 036 667 A1 is a method and a curtain applicator for applying liquid to pasty application media on a running paper, board or other fibrous web in their production and / or processing known, the curtain applicator a substantially gravity-related moving, free-falling order medium curtain directly discharges to the surface of the moving fibrous web and wherein the curtain impinges in a line of impact either on a free web or on a train, the fibrous web supported by a support member area.
  • a fluid delivery device is provided, which is arranged such that the fluid jets emitted by the latter wet the front edges of the fibrous web with the fluid before the impact line of the application medium curtain. As a result, the edge wetted with fluid remains uncoated during subsequent coating.
  • a fluid delivery device can also be provided obliquely to the fibrous web and that at an angle of up to 65 ° employed employees. Contrary to the direction of the web, the fluid jets cut through the curtain in the edge area of the web and wet the web front faces at one point before the curtain reaches the web surface at the point of impact.
  • This provides a method and apparatus for curtain coating a moving paper or board web in which the free falling curtain is separated into a curtain center portion and at least one curtain edge using a separator having a free jet of release liquid.
  • the curtain is stretched at the interface on an inner side and compressed on an outer side, wherein the inside and outside are related to the curtain middle part.
  • the coating is thus distributed on the inside over a larger area.
  • the layer thickness can consequently be reduced in the edge region and bead formation in the edge region on the paper or board web can be minimized. This applies equally to coatings of lower or higher viscosity, which can therefore be applied more uniformly. Function bars of selectable type can thus be applied improved with a small amount of coating, which also results in a cost advantage.
  • the free jet cuts the curtain preferably from behind. At the interface behind the curtain then forms a meniscus-like curvature with the aforementioned advantages.
  • a dispenser for forming a curtain falling on a coating side of the paper or board web in free fall may form a curtain having a width that is less than or greater than the width of the moving paper or board web and / or its backing ,
  • the subject invention is in overboard driving as well as inboard driving applicable.
  • the separation of the curtain can be made by selecting the spatial position of the penetration area so that the entrained curtain edge forwarded and coated the curtain middle part in the manner of inboard driving the paper or board web, without the bead on Edge of the coating, which is applied through the curtain middle part on the paper or board web.
  • the overboard driving style can be converted into an in-board driving style, wherein at the edge of the coating by the curtain middle part no bead is formed or at least the bead formation is minimized.
  • the invention relates to a device for applying at least one layer 1 of a liquid or pasty application medium to a moving paper or board web 2 using a curtain applicator.
  • a curtain applicator known devices can be used, in particular the so-called curtain Coater. From the curtain applicator is in Fig. 1 and Fig. 2 only the curtain divider according to the invention with the associated parts shown.
  • the curtain applicator comprises a transport device for moving a support 3 for the paper or board web 2 through a coating zone 4.
  • the support 3 is here designed, for example, as a support roller.
  • the curtain applicator further comprises a dispenser (not shown) for forming a free-falling curtain 5 of application medium.
  • the curtain 5 is held by curtain holders 6, which guide the free-falling curtain 5 at the curtain edge ends 7, and clamped.
  • Fig. 1 and Fig. 2 each show a curtain edge end 7.
  • the said to this curtain edge end 7 applies mutatis mutandis to the opposite other curtain edge end.
  • the direction of movement of the moving paper or board web 2 is in Fig. 1 indicated by the direction of the arrow 8.
  • the direction of movement of the moving paper or board web 2 can also lie in the opposite direction.
  • the curtain applicator further comprises a separating device 9 for splitting the curtain 5 into a curtain central part 10 which falls on a coating side of the paper or board web 2 in free fall and at least one free-falling curtain edge 11.
  • the separating device 9 has a free jet 12 of a separating liquid covering the plane pierces the curtain 5 in a puncture region 13 and thereby separates the free-falling curtain edge 11 and derived.
  • the free jet 12 is arranged with a beam path which encloses an acute first angle ⁇ with the plane of the curtain (cf. Fig. 1 ) and piercing region 13 penetrates with respect to the paper or board web 2 outwardly directed beam edge 14.
  • the angle ⁇ is preferably in the range between 10 ° and 70 °.
  • the free jet is preferably arranged with a beam path which encloses an acute second angle ⁇ with a plane of the paper or board web 2 in the coating zone 4 and punctures the push-through region 13 with a beam flank 14 directed outwards relative to the paper or board web 2 ,
  • the angle ⁇ is preferably between 5 ° and 60 °.
  • the angle ⁇ but also be 0 °, ie the free jet 12 is then, for example, in a plane parallel to the plane of the paper or board web. 2
  • a starting point of the free jet 12 determined by a nozzle 15 supplying the separating liquid is arranged at a distance of 5 to 500 mm from the curtain 5.
  • a particularly preferred distance of the nozzle 15 to the curtain 5 is for example 40 to 50 mm.
  • the arrangement of the nozzle 15 is preferably carried out in the immediate vicinity of the paper or board web 2 or the pad 3.
  • the arrangement of the nozzle 15 can also be arranged much higher than, for example, 5 mm above the paper or board web 2 or the pad 3. Clearances to the paper or board web 2 from 15 to 20 mm are possible.
  • the free jet 12 is preferably subjected to a pressure between 0.5 and 100 bar.
  • the free jet 12 can be generated via a nozzle opening of 0.3 to 2.0 mm.
  • the free jet 12 is preferably cylindrical.
  • the free jet 12 is preferably oriented so that the piercing region 13 lies in the plane of the curtain 5 in a lower portion of the curtain detached from the curtain holders 6.
  • Fig. 2 shows the separation edge 16. With the elimination of the side guide of the curtain edge ends 7 at the separation edge 16 begins a lateral contraction of the falling curtain 5 due to the surface tension.
  • the width of the curtain 5 may be selected smaller or larger than the width of the paper or board web 2.
  • An inboard driving style as well as an overboard driving style can therefore be embodied according to the invention.
  • the width of the curtain 5 is greater than the width of the paper or board web 2.
  • the curtain 5 is therefore preferably formed in an overboard driving manner as a free-falling curtain 5.
  • a positioning of the puncture area 13 in the plane of the curtain 5 below the separation edge 16 of the curtain holder 6 and laterally spaced marginal edge 19 of the paper or board web 2 can by meniscus-like curvature of separation surfaces 20 to form a curtain center part 10 and at least one curtain edge 11 a uniform layer 1 can be adjusted to lateral edges of the paper or board web 2.
  • a free-falling curtain 5 composed of one or more layers of casting solutions can be formed and applied to a paper or board web 2 in an on-line or off-line process for treating the paper or board web 2.
  • a method for applying at least one layer 1 of a liquid or pasty application medium in the form of a substantially Gravity-induced moving curtain 5 on a moving paper or board web 2 using a curtain applicator preferably comprises the following steps: creating a free-falling curtain 5 of at least one layer 1 of the application medium, which is held clamped during the free fall and forms a coating zone 4 through which the paper or board web 2 is moved on a base 3; Splitting the curtain 5 into a free-falling curtain mid-section 10 and at least one free-falling curtain edge 11 through a release jet 12 formed from a release liquid that pierces the plane of the curtain 5 in a puncture area 13 and thereby separates and diverts the free-falling curtain edge 11; Coating the paper or board web 2 through the curtain center part 10, wherein the free jet 12 has a beam path which forms an acute first angle ⁇ with the plane of the curtain 5 and which is oriented so that the piercing in the puncture region 13 with respect to the Paper or board web 2 outwardly directed
  • the angle ⁇ can be selected in the range between 10 ° and 70 °.
  • the free jet 12 may have a beam path which includes an acute second angle ⁇ with a plane of the paper or board web 2 in the coating zone 4 and which may be oriented such that the piercing in the piercing region 13 with respect to the paper or board web 2 outward beam edge 14 takes place.
  • the angle ⁇ can be chosen between 5 ° and 60 °.
  • a starting point of the free jet 12 determined by a nozzle 15 supplying the separating liquid may be arranged at a distance of 5 to 500 mm from the curtain 5.
  • the free jet 12 can be acted upon with a pressure between 0.5 and 100 bar.
  • the free jet 12 can be generated via a nozzle opening of 0.3 to 2.0 mm.
  • a coating medium one with a viscosity of 50 mPa ⁇ s to 2 Pa ⁇ s can be selected.
  • the width of the curtain 5 can be set smaller or larger than the width of the paper or board web 2.
  • the free jet 12 can be oriented such that the push-through area 13 lie in the plane of the curtain 5 in a lower portion of the curtain 5 detached from the curtain holders 6.

Landscapes

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

Claims (19)

  1. Procédé d'application d'au moins une couche (1) d'un milieu d'application liquide ou pâteux sous la forme d'un rideau (5) se déplaçant sensiblement par la force de gravité sur une bande de papier ou de carton (2) déplacée en utilisant un mécanisme d'application de rideau, avec les étapes suivantes:
    génération d'un rideau en chute libre (5) à partir d'au moins une couche (1) du milieu d'application, qui est maintenu tendu pendant la chute libre et forme une zone de revêtement, à travers laquelle la bande de papier ou de carton (2) est déplacée sur un support (3),
    division du rideau (5) en une partie centrale de rideau en chute libre (10) et au moins un bord de rideau en chute libre (11) par un jet libre (12) formé d'un liquide de séparation, qui perce le plan du rideau (5) dans une zone de perçage (13) et sépare et évacue ainsi le bord de rideau en chute libre (11),
    revêtement de la bande de papier ou de carton (2) par la partie centrale de rideau (10),
    caractérisé en ce que
    le jet libre (12) a une trajectoire de jet, qui forme un premier angle aigu (β) avec le plan du rideau (5) et qui est orientée de sorte que le perçage dans la zone de perçage (13) a lieu avec un flanc de jet (14) orienté vers l'extérieur par rapport à la bande de papier ou de carton (2).
  2. Procédé selon la revendication 1, caractérisé en ce que l'angle (β) est choisi dans la plage entre 10° et 70°.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le jet libre (12) a une trajectoire de jet, qui forme un deuxième angle aigu (a) avec un plan de la bande de papier ou de carton (2) dans la zone de revêtement (4) et qui est orientée de sorte que le perçage dans la zone de perçage (13) a lieu avec un flanc de jet (14) orienté vers l'extérieur par rapport à la bande de papier ou de carton (2).
  4. Procédé selon la revendication 3, caractérisé en ce que l'angle (a) est choisi dans la plage entre 5° et 60°.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'un point de départ du jet libre (12) déterminé par une buse (15) amenant le liquide de séparation est agencé à une distance de 5 à 500 mm du rideau (5).
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le jet libre (12) est sollicité par une pression entre 0,5 et 100 bars.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le jet libre (12) est généré via une ouverture de buse de 0,3 à 2,0 mm.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'est choisi comme milieu d'application, un milieu avec une viscosité de 50 mPa·s à 2 Pa·s.
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la largeur du rideau (5) est réglée plus petite ou plus grande que la largeur de la bande de papier ou de carton (2).
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le jet libre (12) est orienté de telle sorte que la zone de perçage (13) se trouve dans le plan du rideau (5) dans une section inférieure du rideau (5) détachée des porte-rideau (6).
  11. Dispositif d'application d'au moins une couche (1) d'un milieu d'application liquide ou pâteux sur une bande de papier ou de carton (2) déplacée en utilisant un mécanisme d'application de rideau, comprenant un dispositif de transport pour le déplacement d'un support (3) pour la bande de papier ou de carton (2) à travers une zone de revêtement (4), un équipement d'évacuation pour la formation d'un rideau en chute libre (5) à partir du milieu d'application, des porte-rideau (6), qui maintiennent et tendent le rideau en chute libre (5) au niveau des extrémités de bord de rideau (7), et un dispositif de séparation (9) pour la division du rideau (5) en une partie centrale de rideau (10) en chute libre sur un côté de revêtement de la bande de papier ou de carton (2) et au moins un bord de rideau en chute libre (11), dans lequel le dispositif de séparation (9) présente un jet libre (12) d'un liquide de séparation, qui perce le plan du rideau (5) dans une zone de perçage (13) et sépare et évacue ainsi le bord de rideau en chute libre (11), caractérisé en ce que le jet libre (12) est agencé avec une trajectoire de jet, qui forme un premier angle aigu (β) avec le plan du rideau (5) et perce la zone de perçage (13) avec un flanc de jet (14) orienté vers l'extérieur par rapport à la bande de papier ou de carton (2).
  12. Dispositif selon la revendication 11, caractérisé en ce que l'angle (β) est choisi dans la plage entre 10° et 70°.
  13. Dispositif selon la revendication 11 ou 12, caractérisé en ce que le jet libre (12) est agencé avec une trajectoire de jet, qui forme un deuxième angle aigu (α) avec un plan de la bande de papier ou de carton (2) dans la zone de revêtement (4) et perce la zone de perçage (13) avec un flanc de jet (14) orienté vers l'extérieur par rapport à la bande de papier ou de carton (2).
  14. Dispositif selon la revendication 13, caractérisé en ce que l'angle (α) se situe entre 5° et 60°.
  15. Dispositif selon l'une quelconque des revendications 11 à 14, caractérisé en ce qu'un point de départ du jet libre (12) déterminé par une buse (15) amenant le liquide de séparation est agencé à une distance de 5 à 500 mm du rideau (5).
  16. Dispositif selon l'une quelconque des revendications 11 à 15, caractérisé en ce que le jet libre (12) est sollicité par une pression entre 0,5 et 100 bars.
  17. Dispositif selon l'une quelconque des revendications 11 à 16, caractérisé en ce que le jet libre (12) est généré via une ouverture de buse de 0,3 à 2,0 mm.
  18. Dispositif selon l'une quelconque des revendications 11 à 17, caractérisé en ce que le jet libre (12) est orienté de telle sorte que la zone de perçage (13) se trouve dans le plan du rideau (5) dans une section inférieure du rideau (5) détachée des porte-rideau (6).
  19. Dispositif selon l'une quelconque des revendications 11 à 18, caractérisé en ce que la largeur du rideau (5) est réglée plus petite ou plus grande que la largeur de la bande de papier ou de carton (2).
EP15002751.4A 2014-09-25 2015-09-23 Procede et dispositif destines au revetement de rideau Active EP3006115B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014013996.4A DE102014013996A1 (de) 2014-09-25 2014-09-25 Verfahren und Vorrichtung zur Vorhangbeschichtung

Publications (2)

Publication Number Publication Date
EP3006115A1 EP3006115A1 (fr) 2016-04-13
EP3006115B1 true EP3006115B1 (fr) 2017-07-26

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Publication number Priority date Publication date Assignee Title
US4547437A (en) 1984-10-05 1985-10-15 Westinghouse Electric Corp. Protective interlayer for high temperature solid electrolyte electrochemical cells
DE19513531A1 (de) 1995-04-10 1996-10-17 Du Pont Deutschland Verfahren und Vorrichtung zur Verminderung von Störungen beim Vorhanggießen
EP0841589B1 (fr) 1995-04-26 2001-08-08 ILFORD Imaging Switzerland GmbH Procédé et appareil pour le revêtement par rideau d'un support en mouvement
DE19716647A1 (de) 1997-04-21 1998-10-22 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zum Auftragen einer Pigmentstreichfarbe auf eine Papier- oder Kartonbahn
WO1999009253A2 (fr) 1997-08-15 1999-02-25 Jagenberg Papiertechnik Gmbh Procede et dispositif permettant d'appliquer un enduit pigmente sur une bande de papier ou de carton
DE59702151D1 (de) 1997-10-03 2000-09-14 Troller Schweizer Engineering Verfahren und Apparatur zur Vorhangbeschichtung eines bewegten Trägers
US6117236A (en) 1998-03-18 2000-09-12 Eastman Kodak Company Curtain coating apparatus and method with continuous width adjustment
SE515824C2 (sv) 2000-01-26 2001-10-15 Tetra Laval Holdings & Finance Förfarande för tillverkning av ett flerskiktat förpackningslaminat genom våtbeläggning, samt laminat tillverkat enligt förfarandet
DE10117668A1 (de) 2001-04-09 2002-10-10 Bachofen & Meier Ag Buelach Vorrichtung zum Beschichten einer laufenden Materialbahn
WO2003049870A1 (fr) * 2001-12-13 2003-06-19 Dow Global Technologies Inc. Procede et dispositif d'enduction au rideau
FI114726B (fi) 2003-09-10 2004-12-15 Metso Paper Inc Järjestely kuiturainan päällystinlaitteen suutinpalkissa
DE102005017547A1 (de) 2005-04-16 2006-10-19 Voith Patent Gmbh Auftragsverfahren
DE102005036667A1 (de) * 2005-08-04 2007-02-08 Voith Patent Gmbh Auftragsverfahren
JP5228227B2 (ja) 2007-12-05 2013-07-03 ボイス パテント ゲーエムベーハー カーテンコータのエッジガイド

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EP3006115A1 (fr) 2016-04-13

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