EP1521643B1 - Tete d'application de revetement - Google Patents

Tete d'application de revetement Download PDF

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Publication number
EP1521643B1
EP1521643B1 EP03740402A EP03740402A EP1521643B1 EP 1521643 B1 EP1521643 B1 EP 1521643B1 EP 03740402 A EP03740402 A EP 03740402A EP 03740402 A EP03740402 A EP 03740402A EP 1521643 B1 EP1521643 B1 EP 1521643B1
Authority
EP
European Patent Office
Prior art keywords
coating
gap
coating head
colour
chamber
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.)
Expired - Lifetime
Application number
EP03740402A
Other languages
German (de)
English (en)
Other versions
EP1521643A1 (fr
Inventor
Erich Kranz
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.)
Mitsubishi HiTech Paper Flensburg GmbH
Original Assignee
Mitsubishi HiTech Paper Flensburg 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 Mitsubishi HiTech Paper Flensburg GmbH filed Critical Mitsubishi HiTech Paper Flensburg GmbH
Publication of EP1521643A1 publication Critical patent/EP1521643A1/fr
Application granted granted Critical
Publication of EP1521643B1 publication Critical patent/EP1521643B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05C5/005—Curtain coaters

Definitions

  • the invention relates to a coating head for applying a coating composition on a moving medium, in particular a coating head for the curtain coating process for forming a liquid curtain of coating material, which is applied to a continuously moving, web-shaped medium to be, the use of the coating head according to the invention and a coating method utilizing the coating head according to the invention.
  • Such coating heads are known, for example, from EP 0 812 237 B1 or, in a variant embodiment, as a horizontally operating extrusion coating head, from EP 0 673 684 B1 and essentially have a first and an adjacent second coating headhats, between which Gap is formed, wherein the gap is connected to a paint chamber for accommodating the coating composition, and the coating composition is discharged through the gap and the outer side gap end nozzle representing the medium to be coated. Since, after application of the coating composition by means of an extrusion or curtain coating head, the applied coating is no longer uniformed or otherwise aftertreated, it is of great importance that the coating takes place flawlessly.
  • DE 40 32 833 A1 proposes a complete casting applicator for highly viscous products with pouring head, reservoir, return channel and pump with the proviso that the flow of the product has to be made in a laminar manner without blistering. This document thus formulates not so much an invention as the recognition that turbulent movements of the product in the feed to the coating head cause blistering.
  • WO 84/02859 A1 proposes a degassing container into which the coating composition is pumped from a storage container. From an overflow of this degassing container, the foam and air bubbles containing overflow mass is returned to the reservoir. The coating mass removed from the degassing container in the lower region is fed to a coating head and should then no longer have any foam or air bubbles as far as possible.
  • the new unit should be easy to be in construction, making it both inexpensive in its purchase as well also in his later maintenance is. From the outset, it is also part of the catalog of requirements, that the aggregate to be proposed for the technology of application of coating material by means of liquid curtain is applicable.
  • a coating head with a first half and an adjacent second half, between which a gap is formed with a gap length L and a right angle to the gap length L oriented gap width B, wherein the gap formed with at least one of the two coating head halves Color chamber is connected and the ink chamber to accommodate a coating mass is provided, through the gap and the outside gap end representing the nozzle to be coated medium, characterized in that that the color chamber is tapered with one or more upwards Bumps is provided, which open into vents.
  • the degassed coating composition is fed to a gap in a nozzle as the outside At the end of the gap, the coating mass opens onto the coating material to be coated Dispenses medium.
  • the coating head to form a Liquid curtain used corresponds to the gap width B of the desired Curtain thickness, while the gap length L corresponds to the curtain width. This will be in many cases wider than the medium to be coated, so that part of the Liquid curtain falls past the medium in a drip tray, from where the Coating mass is returned to the reservoir.
  • the compensation chamber is over as extension of the gap in its width the entire gap length L in a limited area between nozzle and ink chamber educated.
  • the compensation chamber with the Color chamber connected this happens for example via individual case or connecting pipes or preferably via an intermediate gap between compensation chamber and Color chamber.
  • the coating mass feed is preferably done by means of a lateral inlet opening in the ink chamber, as far as possible via an intermediate degassing unit is connected to the reservoir.
  • the color chamber has furthermore via an outlet opening, which in the opposite side of the ink chamber is embedded and connected to a bypass coating mass removal. Excessive coating mass is via the bypass the reservoir fed again.
  • a ratio of supplied coating mass to by bypass recycled coating material in a range of 1: 0.2 to 1: 2 to be considered particularly advantageous is.
  • the present invention also encompasses the use of the coating head according to the invention for the application in particular of heat-sensitive coating compositions. Bubble inclusions in heat-sensitive coatings lead to faulty coatings Coatings and thus to the elimination of the imaging function. Because the manufacturer of heat-sensitive recording materials for guarantee delivery of an over its entire area is fully committed to functional recording material, malfunctions can be due to a patchy coating complaints in high Justify the extent. against this background, it becomes clear why the constructively simple Possibility of a particularly effective and faultless working, integrated degassing coating head according to the present invention especially for heat-sensitive Coating masses is suitable. Contain such coating compositions on active substance dye precursors and with these under heat influence color-forming reactive, preferably organic color acceptors. In addition to these essential components are other customary additives in the heat-sensitive coating compositions including resins, waxes and stabilizers.
  • the coating head according to the invention can be used both with other coating systems as well as in multiple arrangement, so that wet-on-wet coatings be enabled. It is also conceivable, the proposed coating head to change its construction in such a way that it can be used for simultaneous multiple coating suitable is. In this case come with several Farbkammem with it upwardly tapering, opening in vents bulges, if necessary several Ausreteskammem and several column, the same orientation at the nozzle arranged one behind the other, within a multiple coating head for use.
  • the coating composition is preferably supplied from a storage container via an intermediate degassing unit to the ink chamber of the coating head according to the invention.
  • foam accumulates in the upwardly tapering bulges of the ink chamber.
  • This foam is removed by means of a preferably controllable suction device.
  • the coating mass fraction can be pulled out of the foam and returned to the storage container.
  • the coating material not drawn off as a foam from the ink chamber is fed to the nozzle of the coating head according to the invention.
  • the coating composition under the influence of gravity below the nozzle, the coating composition forms a liquid curtain which falls along a forming, dynamic wetting line onto the web-shaped medium moving continuously below the coating head and relative thereto.
  • the coating composition is heat-sensitive is executed, to which they dye precursor and with these under the influence of heat color forming contains reactive dye acceptors.
  • a paper web is preferred.
  • a protective layer to cite the previously applied heat-sensitive coating. It can both heat-sensitive as well as the protective layer covering them with the inventive Coating head to be applied. This may be delayed as well as done simultaneously with a multilayer coating head.
  • the ink chamber (5) as well as the gap (4) is sealed laterally by means not shown in the figure 1 closure means.
  • this closure means in the lateral extension of the ink chamber (5) on either side each an opening (9, 10) is embedded, of which one opening (9) for coating material supply and the other opening (10) is provided for coating mass removal.
  • a liquid curtain is shown extending along the nozzle (6) vertically downwards and in the lower part through the wetting line (13) as a line of intersection of the liquid curtain with the medium to be coated (12 ) is limited.
  • the wetting line (13) runs parallel to the contact line K.
  • the direction of movement of the medium (12) extends at right angles to the wetting line (13) and parallel to the gap width B.
  • FIG. 2 shows a further variant of the coating head (3 ') according to the invention.
  • a additional tubular compensation chamber (11) formed parallel to the contact line K oriented and half formed in the two coating head halves (1, 2) is.
  • the paint chamber (5) is slotted down over the entire pipe length.
  • the ink chamber (5) on this slot with an intermediate gap (14), each half in the two coating head halves (1, 2) is formed.
  • Downwards opens the intermediate gap (14) in an upper, over the entire Pipe length extending opening slot of the compensation chamber (11). This points down to a second slot across the entire tube length and is above this second slot connected to gap (4), which in turn, as already described for Figure 1, down into the nozzle (6) opens.
  • closure means in addition to the ink chamber (5) and the Gap (4) now also seal the compensation chamber (11) and the intermediate gap (14) laterally.
  • FIG. 3 shows a simplified installation situation of the coating head according to the invention (3, 3 ') without possible pumps and / or other degassing.
  • a storage container (17) contains a coating mass, which from the reservoir (17) via the coating mass feed (15) the coating head (3, 3 ') and is further fed via the inlet opening (9), not shown, of the ink chamber (5).
  • About one of the inlet opening (9) opposite, also not shown outlet opening (10) becomes excessively supplied coating from the ink chamber (5) the bypass coating mass removal, in short: fed to the bypass (16), the in turn connected to the reservoir (17).

Landscapes

  • Coating Apparatus (AREA)
  • Magnetic Heads (AREA)

Claims (10)

  1. Tête de couchage (3, 3') pour l'application d'une masse de couchage sur un support en mouvement (12),
    ayant une première moitié (1) et une seconde moitié adjacente (2),
    une fente (4) étant formée entre celles-ci, ayant une longueur L de la fente et une largeur B de la fente orientée perpendiculairement à la longueur L de la fente,
    la fente (4) étant reliée à une chambre à couleur (5) aménagée dans l'une au moins des deux moitiés (1, 2) de la tête de couchage,
    et la chambre à couleur (5) étant prévue pour accueillir une masse de couchage destinée à être distribuée à travers la fente et une buse (6) constituant l'extrémité extérieure de la fente, sur le support à coucher (12)
    caractérisée en ce que
    la chambre à couleur (5) est pourvue d'une ou de plusieurs élargissements (7) se resserrant vers le haut, débouchant dans des trous d'aération (8).
  2. Tête de couchage selon la revendication 1, caractérisée en ce que la fente (4) s'élargit partiellement au moins dans l'une des deux moitiés de tête de couchage (1, 2) de manière à former une chambre d'équilibrage (11) positionnée entre la buse (6) et la chambre à couleur (5), la chambre à couleur (5) et la chambre d'équilibrage (11) communiquant l'une avec l'autre.
  3. Tête de couchage selon l'une des revendications 1 ou 2, caractérisée en ce que la chambre à couleur (5) comporte une ouverture d'entrée (9) reliée à un alimentation de masse de couchage, et une ouverture de sortie (10) opposée à l'ouverture d'entrée (9), qui est reliée à une évacuation de déviation de la masse de couchage.
  4. Tête de couchage selon l'une des revendications 1 à 3, caractérisée en ce que les trous d'aération (8) sont reliés à un dispositif d'aspiration.
  5. Tête de couchage multiple comprenant une multitude de têtes de couchage individuelles selon l'une des revendications 1 à 4, la buse de la tête de couchage multiple étant constituée au moins par les buses successives des têtes de couchage individuelles disposées les unes derrière les autres selon la même orientation.
  6. Utilisation d'une tête de couchage selon l'une des revendications 1 à 4 pour l'application d'une masse de couchage sur un support en mouvement (12), la masse de couchage contenant des précurseurs de colorants et les accepteurs de colorants réagissant avec ceux-ci sous un apport de chaleur de façon à produire des couleurs.
  7. Procédé de couchage, comprenant la formation d'un rideau de masse de couchage liquide à l'aide d'une tête de couchage selon l'une des revendications 1 à 4, le rideau de liquide arrivant le long d'une ligne de mouillage (13) sur un support en mouvement (12) en forme de bande, se déplaçant de façon continue sous la tête de couchage (3, 3').
  8. Procédé de couchage selon la revendication 7, caractérisé en ce que la masse de couchage contient des précurseurs de colorants et les accepteurs de colorants réagissant avec ceux-ci sous un apport de chaleur de façon à produire des couleurs.
  9. Procédé de couchage selon l'une des deux revendications 7 ou 8, caractérisé en ce que le support (12) est une bande de papier.
  10. Procédé de couchage selon l'une des revendications 8 et 9, caractérisé en ce qu'une couche de protection est ensuite déposée sur la masse de couchage thermosensible ainsi appliquée.
EP03740402A 2002-07-10 2003-07-02 Tete d'application de revetement Expired - Lifetime EP1521643B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10231276 2002-07-10
DE10231276A DE10231276B4 (de) 2002-07-10 2002-07-10 Beschichtungskopf
PCT/EP2003/007050 WO2004007091A1 (fr) 2002-07-10 2003-07-02 Tete d'application de revetement

Publications (2)

Publication Number Publication Date
EP1521643A1 EP1521643A1 (fr) 2005-04-13
EP1521643B1 true EP1521643B1 (fr) 2005-12-28

Family

ID=29796263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03740402A Expired - Lifetime EP1521643B1 (fr) 2002-07-10 2003-07-02 Tete d'application de revetement

Country Status (5)

Country Link
EP (1) EP1521643B1 (fr)
AT (1) ATE314154T1 (fr)
AU (1) AU2003281149A1 (fr)
DE (2) DE10231276B4 (fr)
WO (1) WO2004007091A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004018597B3 (de) * 2004-04-16 2005-12-01 Dürr Systems GmbH Applikationskopf zur Erzeugung einer Flüssigfolie
DE102009036853B3 (de) * 2009-08-10 2010-11-11 Andritz Küsters Gmbh Vorhang-Auftragswerk

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802387A (en) * 1972-06-26 1974-04-09 Prime Mfg Co Coating machine
SE451956B (sv) * 1983-01-25 1987-11-09 Roy Elf Anordning for att minska forekomsten av luftbubblor i en ridamalningsmaskin
US5183508A (en) * 1987-11-23 1993-02-02 Epicor Technology, Inc. Apparatus for patch coating printed circuit boards
ES2016536A6 (es) * 1989-10-17 1990-11-01 Barberan Sa Sistema aplicador, por derrame, de productos de alta viscosidad.
JPH07256189A (ja) * 1994-03-25 1995-10-09 Tdk Corp 押出し塗布ヘッド
US5702527A (en) * 1995-02-22 1997-12-30 Minnesota Mining And Manufacturing Company Restricted flow die

Also Published As

Publication number Publication date
DE10231276A1 (de) 2004-01-29
ATE314154T1 (de) 2006-01-15
DE10231276B4 (de) 2004-11-11
WO2004007091A1 (fr) 2004-01-22
DE50302079D1 (de) 2006-02-02
EP1521643A1 (fr) 2005-04-13
AU2003281149A1 (en) 2004-02-02

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