WO2004007091A1 - Tete d'application de revetement - Google Patents

Tete d'application de revetement Download PDF

Info

Publication number
WO2004007091A1
WO2004007091A1 PCT/EP2003/007050 EP0307050W WO2004007091A1 WO 2004007091 A1 WO2004007091 A1 WO 2004007091A1 EP 0307050 W EP0307050 W EP 0307050W WO 2004007091 A1 WO2004007091 A1 WO 2004007091A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
gap
coating head
ink chamber
head
Prior art date
Application number
PCT/EP2003/007050
Other languages
German (de)
English (en)
Inventor
Erich Kranz
Original Assignee
Mitsubishi Hitec 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 Hitec Paper Flensburg Gmbh filed Critical Mitsubishi Hitec Paper Flensburg Gmbh
Priority to AU2003281149A priority Critical patent/AU2003281149A1/en
Priority to DE50302079T priority patent/DE50302079D1/de
Priority to EP03740402A priority patent/EP1521643B1/fr
Priority to AT03740402T priority patent/ATE314154T1/de
Publication of WO2004007091A1 publication Critical patent/WO2004007091A1/fr

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
    • B05C5/005—Curtain coaters

Definitions

  • the invention relates to a coating head for applying a coating composition to a moving medium, in particular a coating head for the curtain coating method for forming a liquid curtain from coating composition which is to be applied to a continuously moving, web-shaped medium, the use of the coating head according to the invention and a Coating process using the coating head according to the invention.
  • Coating heads of this type are known, for example, from EP 0 812 237 B1 or, in one embodiment as a horizontally operating extrusion coating head, from EP 0 673 684 B1 and essentially have a first and an adjacent second coating head half, between which one Gap is formed, the gap being connected to an ink chamber for accommodating the coating composition, and the coating composition being dispensed to the medium to be coated through the gap and a nozzle representing the outside end of the gap.
  • the two protective rights EP 0 812 237 B1 and EP 0 673 684 B1 listed above attempt to solve the problem of achieving a uniform coating thickness without fluctuations, particularly in the case of thin coating jobs.
  • the coating composition is free of trapped air in the form of air bubbles or foam, since each of such air bubbles leads to defects in the coating.
  • DE 40 32 833 A1 proposes a complete casting application device for highly viscous products with a casting head, storage container, return channel and pump, with the proviso that the flow of the product has to take place in a laminar manner without the formation of bubbles.
  • This document thus formulates less an invention than the knowledge that turbulent movements of the product in the feed to the coating head cause blistering. Thanks to the use of pumps, necessary ink mass filters and long, partially curved lines, the idealized conditions of only laminar flows in the coating material feed to the application head can never be fully realized.
  • WO 84/02859 A 1 proposes a degassing container into which the coating composition is pumped from a storage container.
  • the overflow mass containing foam and air bubbles is returned to the storage container from an overflow of this degassing container.
  • the coating material discharged from the degassing container in the lower area is fed to a coating head and should then no longer have any foam or air bubbles.
  • the new unit should be simple in construction, so that it is both inexpensive to buy and later to maintain. From the outset, it is also part of the catalog of requirements that the unit to be proposed can be used for the technology of applying coating compound by means of a liquid curtain.
  • a coating head with a first half and an adjoining second half, between which a gap is formed with a gap length L and a gap width B oriented at right angles to the gap length L, the gap with at least one of the two coating head halves trained ink chamber is connected and the ink chamber is provided for accommodating a coating material through the gap and the outside of the gap end Representing nozzle is to be dispensed to the medium to be coated, characterized in that the ink chamber is provided with one or more bulges tapering upward, which open into ventilation openings.
  • the paint chamber of the coating head according to the invention is preferably filled with coating material from a storage container via an intermediate degassing unit, residual foam from coating material with enclosed air bubbles collects in the bulges tapering upwards due to the lower specific mass of the coating material-air mixture contaminated with air bubbles. This mixture emerges from the ventilation openings and is ideally fed back to the storage container, for example via a vacuum vent.
  • a variant is preferred in which a negative pressure is applied to the ventilation openings.
  • the degassing performance of the coating head according to the invention can be increased considerably by means of such a preferably controllable suction device.
  • the degassed coating compound is fed to a gap which ends in a nozzle as the outside end of the gap and releases the coating compound onto the medium to be coated.
  • the gap width B corresponds to the desired curtain thickness
  • the gap length L corresponds to the curtain width. In many cases, this is chosen to be wider than the medium to be coated, so that part of the liquid curtain falls past the medium into a collecting tray, from where the coating material is returned to the storage container.
  • the compensation chamber is designed as an expansion of the gap in its width over the entire gap length L in a limited area between the nozzle and the ink chamber.
  • the compensation chamber is connected to the paint chamber, for example via individual downpipes or connecting pipes or preferably via an intermediate gap between the compensation chamber and the paint chamber.
  • the coating material is preferably supplied by means of a lateral inlet opening in the paint chamber, which is connected to the reservoir as far as possible via an intermediate degassing unit.
  • the ink chamber has also via an outlet opening, which is embedded in the opposite side of the ink chamber and is connected to a bypass coating material discharge. Excess coating material is fed back into the storage container via the bypass. Numerous tests have shown that a ratio of coating material supplied to coating material returned by bypass in a range from 1: 0.2 to 1: 2 can be regarded as particularly advantageous.
  • the present invention also includes the use of the coating head according to the invention for the application, in particular, of heat-sensitive coating compositions.
  • Air bubble inclusions in heat-sensitive coatings lead to defective coatings and thus to the loss of the imaging function. Since the manufacturers of heat-sensitive recording materials are obliged to give a guarantee that the recording material is fully functional over its entire surface, incomplete coating can cause complaints to a large extent. against this background it becomes clear why the structurally simple possibility of a particularly effective and error-free, integrated degassing coating head according to the present invention is particularly suitable for heat-sensitive coating compositions.
  • Coating compositions of this type contain dye precursors of active substance and preferably organic color acceptors which react with them to form a color under the influence of heat.
  • other common additives in the heat-sensitive coating compositions include resins, waxes and stabilizers.
  • the coating head according to the invention can be operated both with other coating systems and in a multiple arrangement, so that wet-on-wet coatings are made possible. It is also conceivable to change the design of the proposed coating head in such a way that it is suitable for simultaneous multiple coating. In this case, several ink chambers with tapering bulges opening into ventilation openings, possibly several compensation chambers and several gaps, which are arranged one behind the other in the same orientation, are used within a multiple coating head.
  • the coating composition is preferably taken from a storage container via an intermediate degassing unit of the dyeing chamber of the coating head according to the invention supplied. If there are air pockets in the coating material, foam collects in the bulges of the ink chamber that taper upwards. This foam is removed by means of a preferably controllable suction device. For example, by means of vacuum deaerators, the coating mass fraction can be pulled out of the foam and returned to the storage container.
  • the coating composition not drawn off as foam from the ink chamber is fed to the nozzle of the coating head according to the invention.
  • the coating composition forms a liquid curtain below the nozzle, which falls along a forming - dynamic - wetting line onto the web-shaped medium which is continuously moving relative to the coating head.
  • the coating composition is heat-sensitive, for which purpose it contains dye precursors and color acceptors which react with them to form a color under the influence of heat.
  • a paper web is preferred as the medium.
  • Another preferred method variant is the formation of a protective layer on the previously applied heat-sensitive coating.
  • Both heat-sensitive and the protective layer covering them can be applied with the coating head according to the invention. This can be done with a time delay or simultaneously with a multi-coating head.
  • Figure 1 shows a first variant of the coating head (3) according to the invention with a first half (1) and a second half (2), which is constructed mirror-inverted to the first half (1).
  • the two coating head halves (1, 2) adjoin one another precisely along a straight contact line K.
  • a tubular ink chamber (5) is formed, which is oriented parallel to the contact line K and half of which is formed in the two coating head halves (1, 2).
  • the ink chamber (5) is expanded at the top with conical bulges (7).
  • the bulges (7) taper upwards and open into ventilation openings (8), each half along the contact line K. are formed in the two coating head halves (1, 2).
  • the ink chamber (5) is slotted down the entire length of the tube and connected via the slit to a gap (4), half of which is formed in each of the two coating head halves (1, 2).
  • the gap (4) has a gap length L with the same orientation as the contact line K and a gap width B perpendicular to the gap length L.
  • the gap width B is thus determined by the distance between the two coating head halves (1, 2) in their lower region in accordance with their respective shapes.
  • the gap (4) is bounded at the top by the slot in the ink chamber (5) and at the bottom by a nozzle (6), which represents the gap end at the lower end of the coating head (3).
  • the nozzle (6) runs parallel to the contact line K.
  • the ink chamber (5) like the gap (4), is sealed laterally by closure means, not shown in FIG. 1.
  • An opening (9, 10) is let into each of these closing means in the lateral extension of the ink chamber (5), one opening (9) for supplying the coating material and the other opening (10) for removing the coating material.
  • a liquid curtain is shown, which runs vertically downwards along the nozzle (6) and in the lower region through the wetting line (13) as the cutting line 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) runs 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.
  • an additional tubular compensation chamber (11) is formed below the ink chamber (5), which is oriented parallel to the contact line K and half of which is formed in the two coating head halves (1, 2).
  • the ink chamber (5) is slotted down over the entire length of the tube.
  • the ink chamber (5) is connected via this slot to an intermediate gap (14), half of which is formed in each of the two coating head halves (1, 2).
  • the intermediate gap (14) opens into an upper opening slot of the compensation chamber (11), which extends over the entire length of the tube.
  • This has a second slot at the bottom over the entire length of the tube and is connected via this second slot to a slot (4) which, as already described for FIG. 1, opens into the nozzle (6).
  • closure means which, in addition to the ink chamber (5) and the gap (4), now also laterally seal the compensation chamber (11) and the intermediate gap (14).
  • FIG. 3 shows a simplified installation situation of the coating head (3, 3 ' ) according to the invention without possible pumps and / or further degassing units.
  • a storage container (17) contains a coating material which is supplied from the storage container (17) via the coating material supply (15) to the coating head (3, 3 ' ) and further via the inlet opening (9) (not shown) to the paint chamber (5).
  • FIG. 4 shows an overall coating curtain (18) formed by a multiple coating head.
  • a multiple coating head comprises a plurality, in the case on which FIG. 4 is based, three individual coating heads.
  • the nozzles of the three individual coating heads are combined so that the total coating curtain (18) has the same width the individual coating curtain widths and with a thickness corresponding to the sum of all individual coating curtain thicknesses.

Landscapes

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

Abstract

L'invention concerne une tête d'application de revêtement (3) comprenant une première moitié (1) et une seconde moitié (2), adjacente à la première, entre lesquelles est formée une fente (4) présentant une longueur L et une largeur B, cette dernière étant à angle droit par rapport à la longueur L. La fente (4) est reliée à une chambre à peinture (5) formée au moins dans une des deux moitiés de tête d'application de revêtement (1, 2). Cette chambre à peinture (5) sert à l'introduction d'une matière de revêtement qui doit être déposée, à travers la fente (4) et une buse (6) représentant l'extrémité de la fente côté extérieur, sur le support à recouvrir (12). La chambre à peinture (5) est pourvue d'au moins une protubérance (7) se rétrécissant vers le haut qui débouche dans une ouverture d'aération (8). L'invention concerne également l'utilisation de la tête d'application de revêtement représentée ainsi qu'un procédé d'application de revêtement selon lequel on utilise cette tête d'application de revêtement.
PCT/EP2003/007050 2002-07-10 2003-07-02 Tete d'application de revetement WO2004007091A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2003281149A AU2003281149A1 (en) 2002-07-10 2003-07-02 Coating head
DE50302079T DE50302079D1 (de) 2002-07-10 2003-07-02 Beschichtungskopf
EP03740402A EP1521643B1 (fr) 2002-07-10 2003-07-02 Tete d'application de revetement
AT03740402T ATE314154T1 (de) 2002-07-10 2003-07-02 Beschichtungskopf

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10231276.1 2002-07-10
DE10231276A DE10231276B4 (de) 2002-07-10 2002-07-10 Beschichtungskopf

Publications (1)

Publication Number Publication Date
WO2004007091A1 true WO2004007091A1 (fr) 2004-01-22

Family

ID=29796263

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/007050 WO2004007091A1 (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

Citations (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
WO1984002859A1 (fr) 1983-01-25 1984-08-02 Roy Verner Lennart Elf Dispositif pour machines a peindre par voile de peinture
DE4032833A1 (de) 1989-10-17 1991-04-18 Barberan Sa Giess-auftragvorrichtung fuer hochviskose produkte
US5183508A (en) * 1987-11-23 1993-02-02 Epicor Technology, Inc. Apparatus for patch coating printed circuit boards
EP0812237B1 (fr) 1995-02-22 1998-12-02 Minnesota Mining And Manufacturing Company Filiere a debit limite
EP0673684B1 (fr) 1994-03-25 2000-12-27 TDK Corporation Tête d'enduction par extrusion

Patent Citations (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
WO1984002859A1 (fr) 1983-01-25 1984-08-02 Roy Verner Lennart Elf Dispositif pour machines a peindre par voile de peinture
US5183508A (en) * 1987-11-23 1993-02-02 Epicor Technology, Inc. Apparatus for patch coating printed circuit boards
DE4032833A1 (de) 1989-10-17 1991-04-18 Barberan Sa Giess-auftragvorrichtung fuer hochviskose produkte
EP0673684B1 (fr) 1994-03-25 2000-12-27 TDK Corporation Tête d'enduction par extrusion
EP0812237B1 (fr) 1995-02-22 1998-12-02 Minnesota Mining And Manufacturing Company Filiere a debit limite

Also Published As

Publication number Publication date
DE10231276B4 (de) 2004-11-11
EP1521643B1 (fr) 2005-12-28
AU2003281149A1 (en) 2004-02-02
DE50302079D1 (de) 2006-02-02
ATE314154T1 (de) 2006-01-15
EP1521643A1 (fr) 2005-04-13
DE10231276A1 (de) 2004-01-29

Similar Documents

Publication Publication Date Title
DE112005001233T5 (de) Vorrichtung zum Dosieren von Leim auf einen in Bewegung befindlichen flächenförmigen Gegenstand
DE3347174C2 (fr)
AT394667B (de) Streicheinrichtung
EP0017126B1 (fr) Procédé et dispositif de dépôt simultané de plusieurs couches sur des objets en mouvement, plus particulièrement des bandes, par couler d'un rideau en chute libre du materian à deposer
DE1211488B (de) Vorrichtung zum gleichzeitigen Auftragen mehrerer Schichten
WO2020239774A1 (fr) Dispositif de nettoyage de tête d'impression pour une imprimante 3d et imprimante 3d comprenant un dispositif de nettoyage de tête d'impression ainsi qu'utilisation du dispositif de nettoyage de tête d'impression et procédé de nettoyage d'une tête d'impression d'une imprimante 3d
DE2951651A1 (de) Vorrichtung zum dosierten aufbringen von farbe mittels von pumpen versorgter farbduesen auf die farbauftragwalzen eines farbwerks
EP1122050B1 (fr) Dispositif de refroidissement et de calibrage pour un profile extrudé en matière plastique
WO2009000715A1 (fr) Procédé d'application et ensemble d'application à rideaux
DE2839210A1 (de) Beschichtungsvorrichtung
DE2504701A1 (de) Beschichtungsverfahren und -vorrichtung
DE102007020095A1 (de) Vorrichtung und Verfahren zum Schaumauftrag auf Substrate mit großer Breite
DE10231276B4 (de) Beschichtungskopf
DE112004001664T5 (de) Papier-/Kartonbahnstreichvorrichtung
EP2198975B1 (fr) Unité d'application de rideau
DE102007000801A1 (de) Auftragsvorrichtung
EP2596171B1 (fr) Coucheuse rideau
EP2055832A2 (fr) Dispositif destiné au réglage de la largeur de revêtement d'un revêtement devant être appliqué à l'aide d'une machine de couchage de rideau
EP2067531A2 (fr) Guidage de bord
EP2111925A1 (fr) Unité d'application de rideau
DE3525889C1 (de) Verfahren und Vorrichtung zum troepfchen- oder strahlfoermigen Austrag eines fluessigen Mediums
DE3420206A1 (de) Vorrichtung zum ueberziehen von suesswarenartikeln
DE4234259C1 (de) Bandgießmaschine, bestehend aus mindestens einem Gießrad mit vorgeordneter Gießdüse oder Zwischenbehälter
DE102022106334A1 (de) Filtriervorrichtung zum Filtrieren eines Fluids sowie betreffendes Betriebsverfahren
EP1947241A1 (fr) Procédé de brossage de rideau

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SC SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2003740402

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 2003740402

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 2003740402

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP