EP2149402A1 - Method of coating a substrate with radiation cured paint - Google Patents
Method of coating a substrate with radiation cured paint Download PDFInfo
- Publication number
- EP2149402A1 EP2149402A1 EP09009221A EP09009221A EP2149402A1 EP 2149402 A1 EP2149402 A1 EP 2149402A1 EP 09009221 A EP09009221 A EP 09009221A EP 09009221 A EP09009221 A EP 09009221A EP 2149402 A1 EP2149402 A1 EP 2149402A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- lacquer
- paint
- slot
- coating
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
- B05D1/265—Extrusion coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2252/00—Sheets
- B05D2252/02—Sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
Definitions
- the invention relates to a method for coating a substrate with a radiation-curing lacquer, in which the lacquer is applied with a Schlitzdüsc on the substrate.
- profiles such as decorative profiles for the furniture industry and the like with a veneer, paper, a film or the like are coated, so often the coating layer is painted after sticking to the profile with a radiation-curing paint, especially a UV-curing paint.
- the paint is then sprayed, for example with a spray nozzle on the coated profile.
- a varnish layer is rolled with a roller onto the surface of the cladding material before this material is adhered to the profile.
- the object of the invention is to provide a method which allows a rational production of thicker coating layers with high surface quality.
- This object is achieved in that the paint layer applied to the substrate with a lip of the slot nozzle is elapsed.
- the invention has the advantage that with the help of the slot nozzle and a thicker paint layer can be applied in a single painting. Surprisingly, it has been shown that when using a slot nozzle even with thicker layers of lacquer no "orange peel effect" occurs when the lacquer layer is passed with a lip of the slot nozzle. The invention thus allows a rational production of relatively thick paint layers with a high surface quality.
- the substrate to be painted is a wrapping material, for example a thermoplastic film, a paper or a veneer. with which a profile is to be encased
- the relatively thick varnish layer produced by the process according to the invention can help to stabilize the cladding material.
- the mechanical properties of the lacquer layer can be adjusted so that the thin substrate receives a high resistance to tearing, breakage and scratching and an optimal flexural rigidity with regard to the ummanteinde profile.
- the range of applications is extended, in which first the paint can be applied to the foil or veneer-like substrate and cured by radiation treatment before the profiles are coated with the lakk faced substrate. If the profiles are to be sheathed on two or more sides adjoining one another at a sharp or rounded edge, or if the profile surface to be sheathed has a relief, the flexibility of the lacquer layer allows the sheath material to conform to the profile surface without cracking or breaks occur in the substrate or lacquer layer.
- Fig. 1 schematically a combined painting and cutting device 10 is shown which serves to paint a withdrawn as a continuous web from a roll 12 substrate with a UV-curing paint 16 and then split in the same operation the length of several strips 18, which then separate Rolls 20 wound and stored for further use.
- the substrate 14 may be, for example, a Ummantetungsmaterial such as a thermoplastic film, a veneer or paper, with the furniture profiles. Door frame profiles or the like to be sheathed in a later step, not shown.
- a Ummantetungsmaterial such as a thermoplastic film, a veneer or paper
- the substrate 14 drawn off the roll 12 first passes through a slit nozzle 22 which serves to apply the paint 16 to the substrate, and then to an irradiation station 24 in which the paint layer is cured by irradiation with ultraviolet light. Subsequently, the painted substrate passes through a known cutting station 26, in which it is divided into a plurality of parallel strips 18. Although only two strips 18 are shown in the example shown, it is of course possible in practice to divide the substrate after painting into a larger number of parallel strips whose widths are each adapted to the dimensions of the profiles to be covered.
- the originally withdrawn from the roll 12 substrate 14 may have a relatively large width, for example, a width of 1300 mm.
- FIG. 2 the painting process carried out with the aid of the slot nozzle 22 is shown in more detail.
- This slot nozzle has a slot 28 which extends across the entire width of the substrate 14 and whose mouth is directed to the surface of the substrate to be painted.
- a pump 30 is the liquid paint is fed to the slot 28.
- the thickness of the lacquer layer is largely determined by the throughput of the pump 30.
- the slot nozzle 22 is oriented so that the paint emerging from the slot 28 emerges approximately at right angles to the surface of the substrate 14.
- the slot nozzle is angularly mounted so that the exit direction can be easily varied, for example, in a range of ⁇ 5 ° about the surface normal of the substrate to better match the exit conditions to the viscosity of the lacquer, the thickness of the lacquer layer, and the transport speed of the substrate ,
- Fig. 2 forms the slot 22 on the downstream side of the slot 28 seen in the transport direction of the substrate 14, a lip 32 which serves to. to escape from the slot 28 exiting and by frictional and adhesive forces carried by the continuous substrate 14 paint.
- a high surface quality of the lacquer layer is achieved.
- On the upstream side of the slot 28 thereby forms a light lacquer liquor 34, which is prevented by the movement of the substrate 14 from further propagating against the transport direction of the substrate.
- the slit nozzle 22 can thus be made against the substrate 14 so that the web of the substrate is slightly deflected and slightly wraps around the mouth of the slit nozzle. as in Fig. 2 can be seen.
- the thickness of the layer formed by the varnish 16 on the substrate can be substantially greater than the layer thickness that can be achieved with a conventional roll coating method without the surface quality of the varnish layer suffering.
- lacquer layers with a basis weight of significantly more than 30 g / m 2 , for example 100 g / m 2 can be achieved in a single application process.
- the radiation sources in the irradiation station 24 must protrude slightly beyond the path of the substrate on both sides so that the varnish 16 is completely cured even in the edge zones.
- the wound on the rollers 20 strips 18 of the substrate can be glued later in a special operation on profiles to be covered.
- the relatively thick lacquer layer increases the mechanical stability of the substrate in the actual sheathing process and thus facilitates the handling of the substrate during the sheathing process.
- the coated and varnished profile whose surface is formed by the-for example transparent-varnish 16.
- the thickness and the hardness of the lacquer layer which can be set by choice of the formulation and the irradiation conditions, gives the coated and lacquered profile a high abrasion and scratching capability and, if necessary, a high resistance to moisture and / or chemicals. Since a very smooth surface can be achieved with the slot nozzle 22, the paint layer can also give the profile a decorative gloss effect.
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Lackieren eines Substrats mit einem strahlungshärtenden Lack, bei dem der Lack mit einer Schlitzdüsc auf das Substrat aufgetragen wird.The invention relates to a method for coating a substrate with a radiation-curing lacquer, in which the lacquer is applied with a Schlitzdüsc on the substrate.
Aus
Wenn Profile wie beispielsweise Zierprofile für die Möbelindustrie und dergleichen mit einem Furnier, Papier, einer Folie oder dergleichen ummantelt werden, so wird häufig die Ummantelungsschicht nach dem Aufkleben auf das Profil mit einem strahlungshärtenden Lack, insbesondere einem UV-härtenden Lack lackiert. Der Lack wird dann beispielsweise mit einer Sprühdüse auf das ummantelte Profil aufgesprüht.If profiles such as decorative profiles for the furniture industry and the like with a veneer, paper, a film or the like are coated, so often the coating layer is painted after sticking to the profile with a radiation-curing paint, especially a UV-curing paint. The paint is then sprayed, for example with a spray nozzle on the coated profile.
Bei einem anderen bekannten Verfahren, wird eine Lackschicht mit einer Walzc auf die Oberfläche des Ummantelungsmaterials aufgcrollt, bevor dieses Material auf das Profil aufgeklebt wird.In another known method, a varnish layer is rolled with a roller onto the surface of the cladding material before this material is adhered to the profile.
Aufgabe der Erfindung ist es, ein Verfahren anzugeben, das eine rationelle Herstellung dickerer Lackschichten mit hoher Oberflächengüte erlaubt.The object of the invention is to provide a method which allows a rational production of thicker coating layers with high surface quality.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die auf das Substrat aufgetragene Lackschicht mit einer Lippe der Schlitzdüse verstrichen wird.This object is achieved in that the paint layer applied to the substrate with a lip of the slot nozzle is elapsed.
Wenn UV-härtende Lacke mit einer Walze auf das Substrat aufgetragen werden, so wird mit zunehmender Dicke der Lackschicht die Oberfläche der Lackschicht unebener, und diese Oberfläche nimmt eine Struktur an, die einer Apfelsinenhaut ähnelt. Um eine ästhetisch befriedigende glatte Oberfläche zu erhalten, müssen deshalb bisher mehrere verhältnismäßig dünne Lackschichten nacheinander aufgetragen werden, bis man die gewünschte Gesamtdicke erhält. Nach jedem Auftragschritt ist eine Strahlungsbehandlung erforderlich. damit die aufgetragene Schicht aushärten kann, bevor die nächste Schicht aufgetragen wird. Das herkömmliche Verfahren ist deshalb zeitraubend und kostspielig.When UV-curable varnishes are applied to the substrate with a roller, as the thickness of the varnish layer increases, the surface of the varnish layer becomes uneven, and this surface assumes a structure resembling an orange peel skin. Therefore, in order to obtain an aesthetically pleasing smooth surface, several relatively thin layers of lacquer must be applied successively until the desired total thickness is obtained. After each application step, a radiation treatment is required. so that the applied layer can harden before the next layer is applied. The conventional method is therefore time consuming and expensive.
Die Erfindung hat demgegenüber den Vorteil, daß mit Hilfe der Schlitzdüse auch eine dickere Lackschicht in einem einzigen Lackiervorgang aufgetragen werden kann. Überraschenderweise hat sich nämlich gezeigt, daß bei Verwendung einer Schlitzdüse auch bei dickeren Lackschichten kein "Apfelsinenhauteffekt" eintritt, wenn die Lackschicht mit einer Lippe der Schlitzdüse verstrichen wird. Die Erfindung erlaubt so eine rationelle Herstellung von verhältnismäßig dicken Lackschichten mit einer hohen Oberflächenqualität.The invention has the advantage that with the help of the slot nozzle and a thicker paint layer can be applied in a single painting. Surprisingly, it has been shown that when using a slot nozzle even with thicker layers of lacquer no "orange peel effect" occurs when the lacquer layer is passed with a lip of the slot nozzle. The invention thus allows a rational production of relatively thick paint layers with a high surface quality.
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments and further developments of the invention are specified in the subclaims.
Wenn es sich bei dem zu lackierenden Substrat um ein Ummanteiungsmaterial handelt, beispielsweise eine thermoplastische Folie, ein Papier oder ein Furnier. mit dem ein Profil ummantelt werden soll, so kann die nach dem erfindungsgemäßen Verfahren hergestellte, verhältnismäßig dicke Lackschicht dazu beitragen, das Ummantelungsmaterial zu stabilisieren. Durch geeignete Wahl der Lackrezeptur und/oder der Strahlungsbehandlung beim Aushärten der Lackschicht lassen sich die mechanischen Eigenschaften der Lackschicht so einstellen, daß das dünne Substrat eine hohe Reiß-, Bruch- und Kratzfestigkeit und eine im Hinblick auf das zu ummanteinde Profil optimale Biegesteifigkeit erhält.When the substrate to be painted is a wrapping material, for example a thermoplastic film, a paper or a veneer. with which a profile is to be encased, the relatively thick varnish layer produced by the process according to the invention can help to stabilize the cladding material. By suitable choice of the paint formulation and / or the radiation treatment during curing of the lacquer layer, the mechanical properties of the lacquer layer can be adjusted so that the thin substrate receives a high resistance to tearing, breakage and scratching and an optimal flexural rigidity with regard to the ummanteinde profile.
Dadurch wird der Bereich der Anwendungsfälle erweitert, in denen zunächst der Lack auf das folien- oder furnierartige Substrat aufgetragen und durch Strahlungsbehandlung gehärtet werden kann, bevor die Profile mit dem lakkierten Substrat ummantelt werden. Wenn die Profile auf zwei oder mehr Seiten zu ummanteln sind, die an einer scharfen oder verrundeten Kante aneinandergrenzen, oder wenn die zu ummantelnde Profiloberfläche ein Relief aufweist, erlaubt es die Flexibilität der Lackschicht, daß sich das Ummantelungsmaterial an die Profiloberfläche anpaßt, ohne daß Risse oder Brüche in dem Substrat oder der Lackschicht auftreten.As a result, the range of applications is extended, in which first the paint can be applied to the foil or veneer-like substrate and cured by radiation treatment before the profiles are coated with the lakkierten substrate. If the profiles are to be sheathed on two or more sides adjoining one another at a sharp or rounded edge, or if the profile surface to be sheathed has a relief, the flexibility of the lacquer layer allows the sheath material to conform to the profile surface without cracking or breaks occur in the substrate or lacquer layer.
Im folgenden wird ein Ausführungsbeispiel anhand der Zeichnung näher erläutert.In the following an embodiment will be explained in more detail with reference to the drawing.
Es zeigen:
- Figur 1
- eine schematische Ansicht einer Anlage zur Durchführung des er- findungsgemäßen Verfahrens zum Lackieren eines Substrats: und
- Figur 2
- eine Detailansicht einer Schlitzdüse in der Anlage nach
Fig. 1 .
- FIG. 1
- a schematic view of a system for carrying out the inventive method for painting a substrate: and
- FIG. 2
- a detailed view of a slot nozzle in the plant after
Fig. 1 ,
In
Bei dem Substrat 14 kann es sich beispielsweise um ein Ummantetungsmaterial wie etwa eine thermoplastische Folie, ein Furnier oder auch Papier handeln, mit dem Möbelprofile. Türzargenprofile oder dergleichen in einem nicht gezeigten späteren Schritt ummantelt werden sollen.The
In der in
In
Die Schlitzdüse 22 ist so orientiert, daß der aus dem Schlitz 28 auftretende Lack annähernd rechtwinklig auf die Oberfläche des Substrats 14 austritt. Vorzugsweise ist die Schlitzdüse winkelverstellbar montiert, so daß die Austrittsrichtung leicht, beispielsweise in einem Bereich von ± 5° um die Oberflächennormale des Substrats variiert werden kann, um die Austrittsbedingungen besser an die Viskosität des Lackes, die Dicke der Lackschicht und die Transportgeschwindigkeit des Substrats anzupassen.The
Wie in
Die Schlitzdüse 22 kann folglich so gegen das Substrat 14 angestellt werden, daß die Bahn des Substrats etwas ausgelenkt wird und die Mündung der Schlitzdüse leicht umschlingt. wie in
Die Dicke der durch den Lack 16 auf dem Substrat gebildeten Schicht kann wesentlich größer sein als die Schichtdicke, die mit einem herkömmlichen Walzenauftragverfahren erreichbar ist, ohne daß die Oberflächenqualität der Lackschicht leidet. So lassen sich beispielsweise Lackschichten mit einem Flächengewicht von deutlich mehr als 30 g/m2, beispielsweise 100 g/m2 in einem einzigen Auftragvorgang erreichen. Durch die Lippe 32 der Schlitzdüse 22 wird dabei die obere Oberfläche der Lackschicht sauber verstrichen, so daß man eine äußerst ebene und glatte Lackoberfläche crhält.The thickness of the layer formed by the
Aufgrund der relativ großen Breite des Substrats 14 und der Schlitzdüse 22 und mit Hilfe der unmittelbar nachgeschaltete Schneidstation 26 ist es möglich mehrere Streifen 18 auf effiziente Weise zu lackieren und zuzuschneiden. Zugleich werden so Störungen in der Lackschicht minimicrt, die leicht an den Rändern der Substratbahn auftreten könnten.Due to the relatively large width of the
Die Strahlungsquellen in der Bestrahlungsstaion 24 müssen auf beiden Seiten etwas über die Bahn des Substrats überstehen, damit der Lack 16 auch in den Randzonen vollständig ausgehärtet wird. Dadurch, daß zunächst ein relativ breites Substrat lackiert und bestrahlt wird und erst dann das Substrat in mehrere Streifen 18 mit der tatsächlich gewünschten Breite aufgeteilt wird, kann das Ausmaß der Überstände insgesamt reduziert und somit auch die Energie der UV-Strahlungsquellen effizienter genutzt werden.The radiation sources in the
Die auf die Rollen 20 aufgewickelten Streifen 18 des Substrats können später in einem besonderen Arbeitsgang auf zu ummantelnde Profile aufgeklebt werden. Die verhältnismäßig dicke Lackschicht erhöht bei dem eigentlichen Ummantelungsvorgang die mechanische Stabilität des Substrats und erleichtert damit die Handhabung des Substrats während des Ummantelungsprozesses.The wound on the
Als Ergebnis erhält man so ein ummanteltes und lackiertes Profil, dessen Oberfläche durch den - beispielsweise transparenten - Lack 16 gebildet wird. Die Dicke und die durch Wahl der Rezeptur und der Bestrahlungsbedingungen einstellbare Härte der Lackschicht verleiht dem ummantelten und lackierten Profil eine hohe Abrieb- und Kratzfähigkeit sowie erforderlichenfalls eine hohe Feuchtigkeits- und/oder Chemikalienbeständigkcit. Da sich mit der Schlitzdüse 22 eine sehr glatte Oberfläche erzielen läßt, kann die Lackschicht dem Profil darüber hinaus einen dekorativen Glanzeffekt verleihen.As a result, one obtains a coated and varnished profile whose surface is formed by the-for example transparent-
Claims (9)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008033248A DE102008033248A1 (en) | 2008-07-15 | 2008-07-15 | Method for coating a substrate with a radiation-curing lacquer |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2149402A1 true EP2149402A1 (en) | 2010-02-03 |
Family
ID=41353889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09009221A Withdrawn EP2149402A1 (en) | 2008-07-15 | 2009-07-15 | Method of coating a substrate with radiation cured paint |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2149402A1 (en) |
DE (1) | DE102008033248A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2765000A1 (en) * | 2013-02-12 | 2014-08-13 | Farbwerke Herkula St. Vith S.A. | Hardening of wood imitation coating arranged on a substrate |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1552286A (en) * | 1966-12-06 | 1969-01-03 | ||
DE10019233A1 (en) | 2000-04-18 | 2001-10-25 | Argotec Lacksysteme Gmbh | Plastic film useful for coating wooden objects and furniture, has a coating of a thermoformable radiation curable lacquer |
WO2002020180A1 (en) * | 2000-09-05 | 2002-03-14 | Canti & Figli S.R.L. | Method and machine for applying a thick layer of varnish to facing sheets in roll form |
US20020043210A1 (en) * | 2000-08-25 | 2002-04-18 | Fuji Photo Film Co., Ltd. | Rod coating method and apparatus |
US20070178311A1 (en) * | 2006-01-30 | 2007-08-02 | Konica Minolta Opto, Inc. | Method to produce coated film |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2532428A1 (en) * | 1975-07-19 | 1977-02-03 | Armin Wiblishauser | Veneer jointing into continuous ready-glued cut strips - uses heat proof glue on keyed toothed profiles cut by metal ribbon |
DE19755625A1 (en) * | 1997-12-15 | 1999-07-01 | Jagenberg Papiertech Gmbh | Slot nozzle for coating material webs, in particular paper or cardboard webs with pigment coating ink |
DE10249395A1 (en) * | 2002-01-29 | 2003-08-14 | Voith Paper Patent Gmbh | Machine for the production and / or refinement of a material web and methods relating to such a machine, avoiding contamination or facilitating its removal |
-
2008
- 2008-07-15 DE DE102008033248A patent/DE102008033248A1/en not_active Withdrawn
-
2009
- 2009-07-15 EP EP09009221A patent/EP2149402A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1552286A (en) * | 1966-12-06 | 1969-01-03 | ||
DE10019233A1 (en) | 2000-04-18 | 2001-10-25 | Argotec Lacksysteme Gmbh | Plastic film useful for coating wooden objects and furniture, has a coating of a thermoformable radiation curable lacquer |
US20020043210A1 (en) * | 2000-08-25 | 2002-04-18 | Fuji Photo Film Co., Ltd. | Rod coating method and apparatus |
WO2002020180A1 (en) * | 2000-09-05 | 2002-03-14 | Canti & Figli S.R.L. | Method and machine for applying a thick layer of varnish to facing sheets in roll form |
US20070178311A1 (en) * | 2006-01-30 | 2007-08-02 | Konica Minolta Opto, Inc. | Method to produce coated film |
Also Published As
Publication number | Publication date |
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DE102008033248A1 (en) | 2010-01-28 |
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