EP3006115A1 - 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
EP3006115A1
EP3006115A1 EP15002751.4A EP15002751A EP3006115A1 EP 3006115 A1 EP3006115 A1 EP 3006115A1 EP 15002751 A EP15002751 A EP 15002751A EP 3006115 A1 EP3006115 A1 EP 3006115A1
Authority
EP
European Patent Office
Prior art keywords
curtain
free
paper
board web
edge
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
EP15002751.4A
Other languages
German (de)
English (en)
Other versions
EP3006115B1 (fr
Inventor
Eduard Davydenko
Andreas Pesch
Thomas Hoffmann
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.)
Andritz Kuesters GmbH
Original Assignee
Andritz Kuesters GmbH
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Publication date
Application filed by Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP3006115A1 publication Critical patent/EP3006115A1/fr
Application granted granted Critical
Publication of EP3006115B1 publication Critical patent/EP3006115B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 coater 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, problems would arise with the coating of the paper or board web in the form of edge beads and not dried edges result.
  • 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 ,
  • separating elements which act on the free-falling curtain.
  • a curtain interceptor having a separation edge is known to intercept and deflect a portion of the free-falling curtain near the overflow edge.
  • EP 0 740 197 A1 and EP 0 841 588 A2 it is known to cut off both sides of the curtain by means of knives.
  • a disadvantage of the use of separating elements is the adhesion of the paint on the separating element as well as the dust formation at the top of the separating element.
  • 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 mean that the guide rollers and Airturns are contaminated with the 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.
  • the invention is therefore based on the object to provide a method and apparatus for curtain coating with a curtain divider for the edge region of a curtain applicator, which allow a high uniformity of the distribution of the coating in the edge region.
  • 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 applicable to overboard driving as well as inboard driving.
  • the separation of the curtain can be carried out by selecting the spatial position of the penetration area such that the entrained curtain edge forwarded and the curtain middle part in the manner of the inboard driving the paper or board web coated, without the beading on the 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 dropping onto 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 °. According to one not shown embodiment, 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 peel edge 16 of the curtain holder 6 and laterally spaced edge edge 19 of the paper or board web 2 can by a 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 may 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 gravitationally moving curtain 5 onto a moving paper or board web 2 using a curtain applicator preferably comprises the following steps: producing a free-falling curtain 5 from at least one layer 1 the application medium, which is held clamped during the free fall and forms a coating zone 4, by which the paper or board web 2 is moved on a base 3; Splitting the curtain 5 in a free-falling curtain center part 10 and at least one free-falling curtain edge 11 by a free jet 12 formed from a separating liquid, which pierces the plane of the curtain 5 in a puncture region 13 and thereby the free-falling curtain edge 11 separates and diverts; 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 beam
  • 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)
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 true EP3006115A1 (fr) 2016-04-13
EP3006115B1 EP3006115B1 (fr) 2017-07-26

Family

ID=54198918

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15002751.4A Active EP3006115B1 (fr) 2014-09-25 2015-09-23 Procede et dispositif destines au revetement de rideau

Country Status (2)

Country Link
EP (1) EP3006115B1 (fr)
DE (1) DE102014013996A1 (fr)

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180289A1 (fr) 1984-10-05 1986-05-07 Westinghouse Electric Corporation Cellules électrochimiques à électrolyte solide fonctionnant à haute température
EP0737521A2 (fr) 1995-04-10 1996-10-16 Du Pont De Nemours (Deutschland) Gmbh Procédé et dispositif pour reduire les perturbations dans un rideau d'enduction
EP0740197A1 (fr) 1995-04-26 1996-10-30 Ilford Ag 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
EP0907103A1 (fr) 1997-10-03 1999-04-07 Troller Schweizer Engineering AG Procédé et dispositif pour le revêtement par rideau d'un support en mouvement
EP0943961A2 (fr) 1998-03-18 1999-09-22 Eastman Kodak Company Appareil de couchage par rideau et procédé au réglage continu de la largeur
EP1003934A2 (fr) 1997-08-15 2000-05-31 Jagenberg Papiertechnik GmbH Procede et dispositif permettant d'appliquer un enduit pigmente sur une bande de papier ou de carton
WO2001054828A1 (fr) 2000-01-26 2001-08-02 Tetra Laval Holdings & Finance S A Procede de fabrication d'un lamine d'emballage multicouche et lamine d'emballage obtenu selon ce procede
WO2002081103A1 (fr) 2001-04-09 2002-10-17 Bachofen + Meier Ag Maschinenfabrik Dispositif de revetement d'une bande continue de materiau en deplacement
EP1458493A1 (fr) 2001-12-13 2004-09-22 Dow Global Technologies Inc. Procede et dispositif d'enduction au rideau
WO2005024133A1 (fr) 2003-09-10 2005-03-17 Metso Paper, Inc. Agencement dans une buse destine a un appareil de revetement de bande fibreuse
DE102005017547A1 (de) 2005-04-16 2006-10-19 Voith Patent Gmbh Auftragsverfahren
DE102005036667A1 (de) * 2005-08-04 2007-02-08 Voith Patent Gmbh Auftragsverfahren
EP2067531A2 (fr) 2007-12-05 2009-06-10 Voith Patent GmbH Guidage de bord

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180289A1 (fr) 1984-10-05 1986-05-07 Westinghouse Electric Corporation Cellules électrochimiques à électrolyte solide fonctionnant à haute température
EP0737521A2 (fr) 1995-04-10 1996-10-16 Du Pont De Nemours (Deutschland) Gmbh Procédé et dispositif pour reduire les perturbations dans un rideau d'enduction
EP0740197A1 (fr) 1995-04-26 1996-10-30 Ilford Ag Procédé et appareil pour le revêtement par rideau d'un support en mouvement
EP0841588A2 (fr) 1995-04-26 1998-05-13 Ilford Ag 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
EP1003934A2 (fr) 1997-08-15 2000-05-31 Jagenberg Papiertechnik GmbH Procede et dispositif permettant d'appliquer un enduit pigmente sur une bande de papier ou de carton
EP0907103A1 (fr) 1997-10-03 1999-04-07 Troller Schweizer Engineering AG Procédé et dispositif pour le revêtement par rideau d'un support en mouvement
EP0943961A2 (fr) 1998-03-18 1999-09-22 Eastman Kodak Company Appareil de couchage par rideau et procédé au réglage continu de la largeur
WO2001054828A1 (fr) 2000-01-26 2001-08-02 Tetra Laval Holdings & Finance S A Procede de fabrication d'un lamine d'emballage multicouche et lamine d'emballage obtenu selon ce procede
WO2002081103A1 (fr) 2001-04-09 2002-10-17 Bachofen + Meier Ag Maschinenfabrik Dispositif de revetement d'une bande continue de materiau en deplacement
EP1458493A1 (fr) 2001-12-13 2004-09-22 Dow Global Technologies Inc. Procede et dispositif d'enduction au rideau
WO2005024133A1 (fr) 2003-09-10 2005-03-17 Metso Paper, Inc. Agencement dans une buse destine a un appareil de revetement de bande fibreuse
DE102005017547A1 (de) 2005-04-16 2006-10-19 Voith Patent Gmbh Auftragsverfahren
DE102005036667A1 (de) * 2005-08-04 2007-02-08 Voith Patent Gmbh Auftragsverfahren
EP2067531A2 (fr) 2007-12-05 2009-06-10 Voith Patent GmbH Guidage de bord

Also Published As

Publication number Publication date
EP3006115B1 (fr) 2017-07-26
DE102014013996A1 (de) 2016-03-31

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