EP2852705A1 - Buse en cascade pour l'application de plusieurs couches - Google Patents

Buse en cascade pour l'application de plusieurs couches

Info

Publication number
EP2852705A1
EP2852705A1 EP13721262.7A EP13721262A EP2852705A1 EP 2852705 A1 EP2852705 A1 EP 2852705A1 EP 13721262 A EP13721262 A EP 13721262A EP 2852705 A1 EP2852705 A1 EP 2852705A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
application
nozzles
cascade
gap
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
EP13721262.7A
Other languages
German (de)
English (en)
Other versions
EP2852705B1 (fr
Inventor
Andreas Pesch
Eduard Davydenko
Robert Meitner
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
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 Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP2852705A1 publication Critical patent/EP2852705A1/fr
Application granted granted Critical
Publication of EP2852705B1 publication Critical patent/EP2852705B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—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
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0262—Coating heads with slot-shaped outlet adjustable in width, i.e. having lips movable relative to each other in order to modify the slot width, e.g. to close it

Definitions

  • the invention relates to a cascade nozzle for applying a plurality of layers of liquid or pasty application medium on a moving surface, in particular of paper, cardboard or other fiber, according to the preamble of claim 1.
  • the coating of a moving paper or board web with a coating compound takes place with a curtain applicator (Curtain Coater).
  • Cascade nozzles are used to form a curtain, as known, for example, from WO 2001/54828 A1 and WO 2005/024133 A1.
  • WO 2001/54828 A1 discloses cascade nozzles for a multilayer web coating which operate on the principle of a sliding nozzle.
  • the cascade nozzles are designed as individual nozzles and combined to form a structural unit.
  • the individual nozzles are arranged in parallel one behind the other.
  • the cascade nozzle has a number of individual nozzles corresponding to the number of application layers. This allows the Do not mix application media until they exit the respective nozzle. From these nozzles, the application medium reaches an inclined sliding surface, where the liquid films produced by the individual nozzles are brought together and subsequently passed in the form of a closed multilayer liquid film on the inclined sliding surface to a nozzle lip. At the trailing edge of the nozzle lip forms a multilayer curtain.
  • the application medium or the coating mass should be applied as uniformly as possible over the entire web width.
  • the application thickness must be as constant as possible over the entire web surface.
  • a basic prerequisite for this is a uniform distribution of the coating composition over the outlet width of the cascade nozzle with regard to the volume flow. In order to achieve this, it is known to vary the gap width of the discharge gaps of the application nozzles by means of a device for influencing the transverse profile of the gap width.
  • EP 0 662 386 B1 and WO 2011/145172 A1 disclose devices which work with a mechanical profile correction of the gap width.
  • EP 0 662 386 B1 describes a mechanical gap adjustment on a cascade nozzle by the deformation of the nozzle body in the form of a centrally mounted bending beam via adjusting screws or piezo elements. This gap adjustment is arranged spatially far away from the nozzle gap and therefore works very inaccurate.
  • WO 2011/145172 A1 it is known to directly deform die lips via setscrews located behind them.
  • the adjusting devices are arranged directly on the nozzle columns. The adjustment of the outlet column for the individual layers is possible only at a standstill, since the individual nozzle modules must be moved apart for the adjustment.
  • the object of the invention is therefore to provide a cascade nozzle with a large correction potential in order to ensure a high uniformity of the distribution of the application medium over the outlet width and is inexpensive to manufacture and in operation.
  • a cascade nozzle that combines a mechanical and volumetric cross profile control.
  • the cross profile correction on the outer layers is carried out by means of a mechanical gap adjustment.
  • the transverse profile correction on the inner layers takes place with the aid of a volume flow influencing of the supplied volume flow of application medium.
  • it is preferably a valve and a control cylinder with servomotor, which are each connected to a supply line for application medium per layer.
  • the flow rate influencing is carried out over the web travel width preferably set zone by zone. The adjustment is possible in online mode without interrupting production, resulting in significant cost advantages.
  • the flat sliding surface formed on the upper side by the end faces of the block-like nozzle parts in a cascade nozzle for forming a flow base for the application medium of the individual layers flowing in stages enables multilayer film flows with thin outer layers in a stable curtain.
  • a thin wetting layer as a lower layer and a thin layer as an upper layer Function layer are applied.
  • the outer layers which moreover usually consist of an expensive application medium, can be applied very thinly with a good transverse profile correction by means of a mechanical gap adjustment.
  • Medium thicker layers, where a sufficiently large volume flow flows, can be easily and cheaply applied by volumetric cross profile correction.
  • FIG. 1 shows schematically and partially in section a first embodiment of a cascade nozzle
  • FIG. 2 shows schematically and partly in section a second embodiment of a cascade nozzle
  • FIG. 3 shows schematically and partly in section a third embodiment of a cascade nozzle
  • FIG. 4 schematically shows a section of a subregion of a device for influencing the volumetric flow for a transverse profile correction along a web width section.
  • the invention relates to a cascade nozzle for applying a plurality of layers of liquid or pasty application medium on a moving paper, cardboard or other fibrous web.
  • the cascade nozzle has at least three individual applicator nozzles 4, 5, 6 extending over the machine width, arranged one behind the other and each having an outlet gap 1, 2, 3 for dispensing layers of application medium.
  • the application nozzles 4, 5, 6 between each two nozzle parts. 7 formed and connected to a respective supply line 8 for application medium.
  • the nozzle parts 7 are combined to form a structural unit with the formation of an upper side 9, along which the application medium discharged from the application nozzles 4, 5, 6 slides over to a nozzle lip 10 where it flows off as a multilayer coating curtain.
  • the nozzle parts 7 can be clamped together using a bolt 11 to a nozzle unit, for example.
  • the outlet width of the respective outlet gap 1, 3 of outer applicator nozzles 4, 6 is adjustable via a mechanical gap adjustment 12.
  • the interposed inner application nozzle 5 is associated with a device 13 for controlling the volume flow. If a plurality of inner application nozzles 5 are provided, for example for the formation of a four-, five- or six-layered curtain, then each of these inner application nozzles 5 is preferably associated with such a device 3 for influencing the volume flow.
  • the gap width of the respective outlet gap 1, 3 of the outer application nozzles 4, 6 is set smaller by a spacer 14 than the gap width of the outlet gaps 2 of inner application nozzles 5.
  • the gap widths of the outlet gaps 1, 3 of the outer application nozzles 4, 6 are set to less than 400 ⁇ m, preferably less than 300 ⁇ m.
  • the gap width of the outlet gap 2 of the respective inner application nozzle 5 is set to 400 to 700 ⁇ m, preferably greater than 500 ⁇ m.
  • the outlet gap 1, 3 of the respective outer application nozzle 4, 6 is bounded on the outside by a nozzle wall 15 which is zonally different zones by means of a series of adjusting elements 16 in their distance to an opposite outlet gap wall 17 for a cross profile adjustment along a web width.
  • the adjustable nozzle wall 15 is preferably lip-shaped.
  • the spacer 14 is, for example, in screws as adjusting elements 16 from formed respective bolt.
  • FIG. 4 shows, for a flow direction F, by way of example the construction of a supply line 8 between two nozzle parts 7 under a structural design of these nozzle parts 7. Thereafter, the application medium is supplied to a layer via a distributor chamber 19 , Between the distribution chamber 19 and the outlet gap 2, the device 13 is provided for the flow control. This device is in each case a valve 18 and a control cylinder with servomotor 20, which adjust the flow rate. In the supply line 8, a compensation chamber 21 can still be formed downstream of the respective outlet gap 2 according to a machine-width flow gap 22 and in front of the outlet gap 2. Reference is made in this respect to DE 10 2009 048 820 A1.
  • the cascade nozzle according to FIG. 2 differs from that shown and described in FIG. 1 in that the distribution chamber 19 is formed in the nozzle part 7, on which the other channel elements of the supply line 8 to the outlet gap 2 of the central application nozzle 5 are formed.
  • the cascade nozzle according to FIG. 3 differs from that shown in FIG. 2 in that two inner application nozzles 5 are provided. Each of these inner application nozzles 5 is assigned to a volume control device 13, which can preferably be adjusted in zones. Incidentally, the above applies accordingly.

Landscapes

  • Coating Apparatus (AREA)

Abstract

L'invention concerne une buse en cascade servant à appliquer plusieurs couches de milieu d'application liquide ou pâteux sur une bande continue de papier, de carton ou d'autre matériau fibreux en mouvement, comportant au moins trois buses d'application individuelles (4, 5, 6) s'étendant sur la largeur de la machine, disposées les unes derrière les autres et présentant chacune une fente de sortie (1, 2, 3) et prévues pour diffuser le milieu d'application en couches. Les buses d'application (4, 5, 6) sont réalisées selon l'invention entre deux parties de buse (7) et raccordées chacune à une alimentation (8) pour le milieu d'application. Les parties de buse (7) sont réunies pour former un ensemble monté présentant une face supérieure (9) le long de laquelle le milieu d'application diffusé par les buses d'application (4, 5, 6) glisse en se superposant vers une lèvre de buse (10) et s'écoule à partir de celle-ci sous forme d'un rideau d'enduction à plusieurs couches. La largeur de sortie de chaque fente de sortie (1, 3) des buses d'application extérieures (4, 6) est ajustable au moyen d'un réglage de fente mécanique (12) et la ou les buses d'application intérieures (5) disposées entre celles-ci sont associées chacune à un dispositif (13) destiné à influer sur le débit volumique.
EP13721262.7A 2012-05-22 2013-05-02 Buse en cascade pour l'application de plusieurs couches Active EP2852705B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012010050A DE102012010050A1 (de) 2012-05-22 2012-05-22 Kaskadendüse zum Auftragen mehrerer Schichten
PCT/EP2013/001291 WO2013174474A1 (fr) 2012-05-22 2013-05-02 Buse en cascade pour l'application de plusieurs couches

Publications (2)

Publication Number Publication Date
EP2852705A1 true EP2852705A1 (fr) 2015-04-01
EP2852705B1 EP2852705B1 (fr) 2017-11-22

Family

ID=48326238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13721262.7A Active EP2852705B1 (fr) 2012-05-22 2013-05-02 Buse en cascade pour l'application de plusieurs couches

Country Status (3)

Country Link
EP (1) EP2852705B1 (fr)
DE (1) DE102012010050A1 (fr)
WO (1) WO2013174474A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2894254B1 (fr) 2014-01-08 2019-08-21 Valmet Technologies, Inc. Dispositif de revêtement pour l'application de couleur de revêtement sur une bande de fibres et procédé associé

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5464577A (en) 1994-01-04 1995-11-07 Minnesota Mining And Manufacturing Company Method of thickness control for dies
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
JP3823820B2 (ja) * 2001-08-24 2006-09-20 三菱マテリアル株式会社 塗布装置
FI114726B (fi) 2003-09-10 2004-12-15 Metso Paper Inc Järjestely kuiturainan päällystinlaitteen suutinpalkissa
DE102009048820A1 (de) 2009-10-09 2011-04-14 Andritz Küsters Gmbh Vorhang-Auftragswerk
DE102009058467B4 (de) 2009-12-16 2012-12-06 Andritz Küsters Gmbh Vorhang-Auftragswerk
WO2011145172A1 (fr) 2010-05-18 2011-11-24 フォイト パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング Tête de coucheuse à fontaine directe

Also Published As

Publication number Publication date
EP2852705B1 (fr) 2017-11-22
WO2013174474A1 (fr) 2013-11-28
DE102012010050A1 (de) 2013-11-28

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