EP2475525B2 - Printing plastic films using a digital printer having stationary print heads for production orders with small lot sizes - Google Patents

Printing plastic films using a digital printer having stationary print heads for production orders with small lot sizes Download PDF

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Publication number
EP2475525B2
EP2475525B2 EP10757565.6A EP10757565A EP2475525B2 EP 2475525 B2 EP2475525 B2 EP 2475525B2 EP 10757565 A EP10757565 A EP 10757565A EP 2475525 B2 EP2475525 B2 EP 2475525B2
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Prior art keywords
ink
film
printing
printed
ink jet
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German (de)
French (fr)
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EP2475525A1 (en
EP2475525B1 (en
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Hans Jürgen AUMÜLLER
Heiko Usener
Lothar Held
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Renolit SE
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Renolit SE
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Priority to SI201030856T priority Critical patent/SI2475525T2/en
Priority to PL10757565T priority patent/PL2475525T5/en
Publication of EP2475525A1 publication Critical patent/EP2475525A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
    • B41J2/2128—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of energy modulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects

Definitions

  • the present invention relates to a method for printing plastic films for production orders with small batch sizes.
  • Printed plastic films for finishing surfaces are widely used. As a field of application, especially the furniture industry and the construction industry are mentioned, in which the reproduction of wood surfaces is particularly in demand. In the meantime it is less the argument of the costs than that of a clearly improved characteristic of use, which helps the imitation wood decors to their flourishal march. For example, furniture as well as windows, doors and similar components with a plastic surface are easier to care for, less sensitive and more durable than wooden models. The quality of the printed wood décor is so high that a visual distinction from the "real" wood is often not easy at first hand.
  • UV-crosslinking printing inks thermosetting plastics
  • printed film grades thermoplastics
  • embossed together to protect the print thermally with a transparent, thermoplastic film in a continuous process.
  • the transparency would be the least. Easily remove impacts from the printed film.
  • the ink must also show a thermoplastic behavior.
  • Arrays of stationary printheads are used according to the invention, which by arranging individual printheads side by side and the arrangement of at least two rows of printheads in succession per color allow the necessary width of 1.50 meters to 2.00 meters.
  • the print heads in this case comprise corresponding fixed nozzles for the colors, which in a manner known per se, preferably piezoelectrically controlled, apply the necessary amount of ink to the film passed underneath. Due to the staggered arrangement of the print heads, the entire surface can be printed. Particularly suitable are so-called "drop on demand" systems.
  • the ink contains substantially the same dyes and / or pigments as the ink used in the gravure printing process.
  • the viscosity and the property of the ink must be adjusted.
  • solvents are changed in the type and concentration or stabilizers are reduced or eliminated in the concentration.
  • the binder can be adjusted, but it must be ensured that the properties such as light and UV stability are given and also the color effect of the dyes / pigments must not change.
  • the quality of the print in terms of resolution corresponds to that of the gravure printing method, since with the adapted inks and the printhead arrays, the ink can be applied to the plastic film with the same precision as in gravure printing. In particular, it is important that the ink is solvent-based, as the gravure ink is.
  • intaglio and digital printing are also achieved according to the invention in that the control of the printheads is set up in such a way that the application of color is locally and quantitatively controlled in accordance with the gravure printing process. In contrast to normal controls, therefore, not only the decoration is considered, but also the local-quantitative distribution of the color, as it occurs in a gravure, simulated.
  • both digital data for producing a pressure roller and z are particularly advantageous.
  • Printed films, veneers or other arbitrary surfaces for generating the digital data e.g. using a scanner.
  • FIG. 1 illustrates the inventive method schematically.
  • the film 1 is guided under an array of print heads, here indicated by two rows of print heads 2a and 2b, in a manner known per se. As a rule, four to eight rows of print heads make sense.
  • the film is unwound from a roll and fed via suitable guide rollers to the printhead array.
  • the running direction of the film is indicated by an arrow. For clarity, only a portion of the film is shown and the known per se devices for the supply are omitted.
  • the printheads 2a and 2b are operated in accordance with the desired printing pattern by the controller 3 so that the corresponding amount of ink is sprayed onto the film passed by. This control is known per se, and allows to specify the desired print pattern digitally and without applying a start-up amount of film from the first cm to.
  • the supply of ink to the printheads is not shown. Depending on the length, the film is then wound onto a roll or cut directly to the desired size of the pattern.
  • the invention also relates to all combinations of preferred embodiments, as far as these are not mutually exclusive.
  • the information "about” or “approx.” in conjunction with a numerical indication, means that at least 10% higher or lower values or 5% higher or lower values and in any case 1% higher or lower values are included.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Bedrucken von Kunststoff-Folien für Produktionsaufträge mit kleinen Losgrößen.The present invention relates to a method for printing plastic films for production orders with small batch sizes.

Bedruckte Kunststofffolien zur Veredelung von Oberflächen sind weit verbreitet. Als Einsatzgebiet sind vor allem die Möbelindustrie sowie die Baubranche zu nennen, bei denen die Nachbildung von Holzoberflächen besonders gefragt ist. Es ist dabei inzwischen weniger das Argument der Kosten als das einer deutlich verbesserten Gebrauchseigenschaft, welches den nachgebildeten Holzdekoren zu ihrem Siegeszug verhilft. So sind beispielsweise Möbel sowie Fenster, Türen und ähnliche Bauteile mit einer Kunststoffoberfläche leichter zu pflegen, unempfindlicher und langlebiger als die Vorbilder aus Holz. Die Qualität des aufgedruckten Holzdekors ist so hoch, dass eine visuelle Unterscheidung vom "echten" Holz oft nicht einmal aus nächster Nähe leicht fällt.Printed plastic films for finishing surfaces are widely used. As a field of application, especially the furniture industry and the construction industry are mentioned, in which the reproduction of wood surfaces is particularly in demand. In the meantime it is less the argument of the costs than that of a clearly improved characteristic of use, which helps the imitation wood decors to their triumphal march. For example, furniture as well as windows, doors and similar components with a plastic surface are easier to care for, less sensitive and more durable than wooden models. The quality of the printed wood décor is so high that a visual distinction from the "real" wood is often not easy at first hand.

Diese hohe Qualität des Druckes ist bisher nur mit dem direkten Tiefdruckverfahren erreichbar. Nachteilig dabei ist, dass die Herstellung der Druckwalzen aufwändig und teuer ist. Neben der hohen Auflösung kommt es auch entscheidend auf die bei diesem Verfahren verwendeten Lösemittel-basierten Druckfarben an, welche die hohe Auflösung und gute Haftung bei Kunststofffolien als Substrat mit ermöglichen. Wegen der hohen Kosten für die Druckwalzen ist die Herstellung von Kleinserien, beispielsweise einigen hundert oder tausend Metern nicht wirtschaftlich möglich. Auch die Herstellung von Probedrucken ist wirtschaftlich nicht rentabel, da beim Anfahren des Druckverfahrens regelmäßig einige hundert Laufmeter Ausschuss produziert werden. Standardlosgrößen umfassen daher technologiebedingt immer mehr Folie (Rohstoffe), als an die Kunden verkauft werden kann.This high quality of printing has previously been achievable only with direct gravure printing. The disadvantage here is that the production of the pressure rollers is complicated and expensive. In addition to the high resolution, it is also crucial to the solvent-based inks used in this process, which allow the high resolution and good adhesion of plastic films as a substrate. Because of the high cost of the printing rollers, the production of small series, for example, a few hundred or a thousand meters is not economically possible. Also, the production of proofs is economically not profitable, since when starting the printing process regularly several hundred meters of scrap are produced. Standard lot sizes therefore include more and more film (raw materials) due to technology reasons, as can be sold to customers.

Es wäre wünschenswert ein Druckverfahren zu haben, mit welchem diese Aufgaben besser gelöst werden können. Zwar sind digitale Druckverfahren, welche sich hierfür im Prinzip anbieten würden, bekannt, es fehlt diesen jedoch im Hinblick auf Kunststofffolien an der notwendigen Auflösung und/oder Geschwindigkeit und einer geeigneten Druckfarbe, um wirtschaftlich eingesetzt zu werden. Bei der Ausmusterung kommt hinzu, dass die Druckfarben für den Digitaldruck völlig andere Grundlagen und farbgebende Substanzen aufweisen, so dass es praktisch nie gelingt, eine echte Ausmusterung herzustellen. Die Farbe und das Dekor sind nicht mit den später im Tiefdruckverfahren, welches für die Herstellung der üblichen Mengen von einigen Tausend Metern Folie und mehr verwendet wird, identisch (z.B. Metamerie).It would be desirable to have a printing process with which these tasks can be better solved. Although digital printing processes, which in principle would be suitable for this purpose, are known, with regard to plastic films, however, they lack the necessary resolution and / or speed and a suitable printing ink in order to be used economically. In the case of the cancellation, the printing inks for digital printing have completely different bases and coloring substances, so that it is virtually impossible to produce a true pattern. The color and the decoration are not identical with those later in the gravure printing process used for the production of the usual amounts of several thousand meters of film and more (e.g., metamerism).

In DE 10 2006 022 774 B3 wird zur Herstellung von Ausmusterungen für Laminate, bei denen das Dekor im indirekten Tiefdruckverfahren auf ein Papier gedruckt wird, vorgeschlagen, eine identische Tinte im Tintenstrahldruckverfahren zu verwenden. Dies lässt sich auf Folien, insbesondere für Kleinserien, nicht übertragen. Weiterhin wird die Veredelung diskontinuierlich durch eine Kurzzeitpresse in Verbindung mit einer Kunstharzschicht, das einem vernetzenden Duroplasten entspricht, realisiert. Die im Tintenstrahldruck verwendeten Tinten zeigen nicht die für den Einsatz erforderliche Witterungsbeständigkeit, basieren normalerweise auf Wasser und liefern deswegen für Kunststofffolien grundsätzlich nicht die notwendige Haftung und Trocknung. Versuche zeigten überraschend, dass selbst nach einigen Tagen nach dem Drucken der Druck nicht wischfest und die bedruckte Folie somit nicht weiterverarbeitbar war. Der Versuch die im direkten Tiefdruck von Folien eingesetzten, Lösemittel-basierten Farben als Tinten zu verwenden scheitert.In DE 10 2006 022 774 B3 For example, in order to produce patterns for laminates in which the decor is gravure printed on a paper, it is proposed to use an identical ink in the ink jet printing process. This can not be transferred to films, especially for small series. Furthermore, the finishing is realized discontinuously by a short-term press in conjunction with a synthetic resin layer which corresponds to a crosslinking thermoset. The inks used in ink-jet printing do not exhibit the weathering resistance required for use, are usually based on water, and therefore generally do not provide the necessary adhesion and drying to plastic films. Experiments showed surprisingly that even after a few days after printing, the print did not wipe and the printed film was thus not further processable. The attempt to use the solvent-based inks used in direct gravure printing of films fails as inks.

Es hat sich auch gezeigt, dass UV-Vernetzende Druckfarben (Duroplaste) nicht verwendbar sind, da gedruckte Folienqualitäten (Thermoplaste) in der Regel zum Schutz des Druckes thermisch mit einer transparenten, thermoplastischen Folie in einem kontinuierlichen Prozess unlösbar miteinander kaschiert und geprägt werden. Bei der Anwendung würde sich die Transparentfolie bei geringsten. Einwirkungen problemlos von der bedruckten Folie lösen. Somit muss die Druckfarbe auch ein thermoplastisches Verhalten zeigen.It has also been shown that UV-crosslinking printing inks (thermosetting plastics) can not be used, since printed film grades (thermoplastics) are usually imperviously laminated and embossed together to protect the print thermally with a transparent, thermoplastic film in a continuous process. When used, the transparency would be the least. Easily remove impacts from the printed film. Thus, the ink must also show a thermoplastic behavior.

Es bestand daher weiter die Aufgabe, eine Möglichkeit zu finden, wie Kleinserien bis zu tausend Meter Folienlänge wirtschaftlich mit der vom Tiefdruck her bekannten Qualität hergestellt werden können.It was therefore further the task of finding a way as small series up to a thousand meter film length can be produced economically with the known from gravure ago quality.

Überraschend wurde nun gefunden, dass es möglich ist, mit sogenannten single pass Druckköpfen eine ausreichende Druckgeschwindigkeit zu erreichen, wobei die auch für den Tiefdruck verwendete Tinte nach Modifizierung der Viskosität, Bindemittel, Lösemittel, Pigmente und deren feineren Dispergierung mit der notwendigen Auflösung appliziert werden kann.Surprisingly, it has now been found that it is possible to achieve a sufficient printing speed with so-called single pass print heads, wherein the ink used for gravure printing can also be applied after modification of the viscosity, binders, solvents, pigments and their finer dispersion with the necessary resolution ,

Der Einsatz von feststehenden Druckköpfen mit entsprechend bewegtem Drucksubstrat ist im Prinzip vom Plotter bekannt. Dabei fehlte es jedoch bisher an der Möglichkeit die notwendigen Breiten von 1 bis 2 meter in akzeptabler Geschwindigkeit zu bedrucken. Auch bei der Herstellung von Kleinserien muss die Folienbreite der üblicherweise verwendeten im Bereich von 1,50 bis 2,00 meter entsprechen um wirtschaftlich arbeiten zu können. Dies war weder mit Plottern noch mit den daraus weiterentwickelten Tintenstrahldruckern möglich, die maximal realisierte Breite betrug lediglich bis zu 50 cm.The use of fixed printheads with a correspondingly moving printing substrate is known in principle from the plotter. However, it lacked the possibility to print the necessary widths of 1 to 2 meters in an acceptable speed. Even in the production of small series, the film width of the commonly used in the range of 1.50 to 2.00 meters must correspond to work economically. This was neither possible with plotters nor with the further developed inkjet printers, the maximum realized width was only up to 50 cm.

Erfindungsgemäß kommen Arrays von ortsfesten Druckköpfen zum Einsatz, welche durch Anordnung von Einzeldruckköpfen nebeneinander und die Anordnung von mindestens zwei Reihen der Druckköpfe hintereinander je Farbe die notwendige Breite von 1,50 meter bis 2,00 meter ermöglichen. Die Druckköpfe umfassen dabei entsprechende feste Düsen für die Farben, die in an sich bekannter Weise, vorzugsweise piezoelektrisch gesteuert, die notwendige Menge Farbe auf die darunter vorbeigeführte Folie applizieren. Durch die versetzte Anordnung der Druckköpfe kann die gesamte Fläche bedruckt werden. Geeignet sind besonders sogenannte "drop on demand" Systeme.Arrays of stationary printheads are used according to the invention, which by arranging individual printheads side by side and the arrangement of at least two rows of printheads in succession per color allow the necessary width of 1.50 meters to 2.00 meters. The print heads in this case comprise corresponding fixed nozzles for the colors, which in a manner known per se, preferably piezoelectrically controlled, apply the necessary amount of ink to the film passed underneath. Due to the staggered arrangement of the print heads, the entire surface can be printed. Particularly suitable are so-called "drop on demand" systems.

Die Tinte enthält im wesentlichen dieselben Farbstoffe und/oder Pigmente wie die im Tiefdruckverfahren verwendete Farbe. Jedoch muss für die Applikation im Tintenstrahldruckverfahren die Viskosität und die Eigenschaft der Farbe angepasst werden. Dazu werden beispielsweise Lösemittel in der Art und Konzentration verändert bzw. Stabilisatoren in der Konzentration vermindert oder weggelassen. Auch das Bindemittel kann angepasst werden, wobei jedoch darauf zu achten ist, dass weiterhin die Eigenschaften wie Licht- und UV-Stabilität gegeben sind und auch die Farbwirkung der Farbstoffe/Pigmente darf sich nicht ändern. Es kann weiterhin notwendig sein, die Pigmente in ihrer Feinheit anzupassen, da die Düsen der Druckköpfe mit den im Tiefdruck angewandten Pigmentgrößen häufig nicht kompatibel sind. Durch die feinere Aufmahlung der Pigmente kann eine Anpassung von deren Menge notwendig sein. Ansonsten sollte die Auftragsmenge der Pigmente/Farbstoffe insbesondere bei Ausmusterungen nicht von der Menge im späteren Herstellverfahren abweichen.The ink contains substantially the same dyes and / or pigments as the ink used in the gravure printing process. However, for the application by the ink jet printing method, the viscosity and the property of the ink must be adjusted. For this purpose, for example, solvents are changed in the type and concentration or stabilizers are reduced or eliminated in the concentration. Also, the binder can be adjusted, but it must be ensured that the properties such as light and UV stability are given and also the color effect of the dyes / pigments must not change. It may also be necessary to adjust the fineness of the pigments since the nozzles of the printheads are often incompatible with the pigment sizes used in gravure printing. Due to the finer grinding of the pigments, an adjustment of their quantity may be necessary. Otherwise, the application quantity of the pigments / dyes should not deviate from the amount in the later production process, especially in the case of samples.

Als Geschwindigkeit des Druckverfahrens konnte mit diesen Maßnahmen überraschend 20m/min bis zu 40m/min erreicht werden, was eine wirtschaftliche Produktion von Kleinserien erlaubt.As a speed of the printing process could be achieved with these measures surprisingly 20m / min up to 40m / min, which allows an economical production of small series.

Die Qualität des Druckes was die Auflösung angeht entspricht derjenigen des Tiefdruckverfahrens, da mit den angepassten Tinten und den Druckkopfarrays die Farbe mit derselben Präzision wie im Tiefdruck auf die Kunststofffolie appliziert werden kann. Insbesondere kommt es darauf an, dass die Tinte lösemittelbasiert ist, so wie es die Tiefdruckfarbe auch ist.The quality of the print in terms of resolution corresponds to that of the gravure printing method, since with the adapted inks and the printhead arrays, the ink can be applied to the plastic film with the same precision as in gravure printing. In particular, it is important that the ink is solvent-based, as the gravure ink is.

Erfindungsgemäß ist es weiterhin vorteilhaft, wenn ein Farbmessgerät die Farb- und Druckkonstanz überwacht.According to the invention it is furthermore advantageous if a colorimeter monitors the color and printing constancy.

Die Identität zwischen Tiefdruck und Digitaldruck wird erfindungsgemäß auch dadurch erreicht, dass die Steuerung der Druckköpfe so eingerichtet ist, dass der Farbauftrag örtlich und mengenmäßig dem Tiefdruckverfahren entsprechend gesteuert wird. Im Gegensatz zu normalen Steuerungen wird also nicht nur das Dekor berücksichtigt, sondern auch die örtlich-mengenmäßige Verteilung der Farbe, wie sie bei einem Tiefdruck erfolgt, simuliert.The identity between intaglio and digital printing is also achieved according to the invention in that the control of the printheads is set up in such a way that the application of color is locally and quantitatively controlled in accordance with the gravure printing process. In contrast to normal controls, therefore, not only the decoration is considered, but also the local-quantitative distribution of the color, as it occurs in a gravure, simulated.

Somit wird eine Dekorgleichheit zwischen Digitaldruck und Tiefdruck erreicht, es tritt keine oder eine minimale Metamerie auf und der Druck beliebiger Dekore, wie Holzdekore, Phantasiemuster aber auch uni Farben ist sowohl als Ausmusterung wie auch als Kleinserie durchführbar.Thus, a decor equality between digital printing and gravure is achieved, there is no or minimal metamerism and the pressure of any decors, such as wood decors, fantasy patterns but also uni colors can be performed both as a retirement as well as a small series.

Besonders vorteilhaft ist es, dass sowohl Digitaldaten zur Herstellung einer Druckwalze als auch z. B. bedruckte Folien, Furniere oder andere beliebige Oberflächen zur Erzeugung der Digitaldaten, z.B. mittels Scanner, verwendet werden können.It is particularly advantageous that both digital data for producing a pressure roller and z. Printed films, veneers or other arbitrary surfaces for generating the digital data, e.g. using a scanner.

Die Erfindung soll anhand der Figur erläutert werden, ohne jedoch auf die speziell beschriebene Ausführungsform beschränkt zu sein.The invention will be explained with reference to the figure, but without being limited to the specifically described embodiment.

Figur 1 veranschaulicht das erfindungsgemäße Verfahren schematisch. FIG. 1 illustrates the inventive method schematically.

Die Folie 1 wird unter einem Array von Druckköpfen, hier durch zwei Reihen Druckköpfe 2a und 2b angedeutet, in an sich bekannter Weise geführt. In der Regel sind vier bis acht Reihen Druckköpfe sinnvoll. Typischerweise wird die Folie von einer Rolle abgewickelt und über geeignete Führungsrollen dem Druckkopfarray zugeführt. Die Laufrichtung der Folie ist mit einem Pfeil angedeutet. Der Übersichtlichkeit halber ist nur ein Teilstück der Folie dargestellt und die an sich bekannten Vorrichtungen für die Zufuhr sind weggelassen. Die Druckköpfe 2a und 2b werden entsprechend dem gewünschten Druckmuster von der Steuerung 3 so betätigt, dass die entsprechende Menge Tinte auf die vorbeigeführte Folie aufgespritzt wird. Diese Steuerung ist an sich bekannt, und erlaubt es, das gewünschte Druckmuster digital vorzugeben und ohne eine Anlaufmenge an Folie vom ersten cm an zu applizieren. Die Zufuhr der Tinte zu den Druckköpfen ist nicht dargestellt. Die Folie wird dann je nach Länge auf eine Rolle gewickelt oder direkt auf die gewünschte Größe der Ausmusterung zugeschnitten.The film 1 is guided under an array of print heads, here indicated by two rows of print heads 2a and 2b, in a manner known per se. As a rule, four to eight rows of print heads make sense. Typically, the film is unwound from a roll and fed via suitable guide rollers to the printhead array. The running direction of the film is indicated by an arrow. For clarity, only a portion of the film is shown and the known per se devices for the supply are omitted. The printheads 2a and 2b are operated in accordance with the desired printing pattern by the controller 3 so that the corresponding amount of ink is sprayed onto the film passed by. This control is known per se, and allows to specify the desired print pattern digitally and without applying a start-up amount of film from the first cm to. The supply of ink to the printheads is not shown. Depending on the length, the film is then wound onto a roll or cut directly to the desired size of the pattern.

Damit ist es erfindungsgemäß möglich, für Ausmusterungen eine Menge von wenigen Metern, z.B. 1 bis 2 m herzustellen. Aufgrund der hohen Geschwindigkeit des Druckverfahrens ist es möglich, eine Kleinserie von einigen hundert bis zu einigen tausend metern wirtschaftlich zu produzieren. Dies ist besonders bei ausgefallenen Farben oder Dekoren interessant, die bisher nicht mit vertretbarem Aufwand realisiert werden konnten. Designern und Architekten wird so eine ganz neue Individualität ermöglicht. Aber auch bei der Fertigung kann noch mehr auf eine Produktion der mit der Folie dekorierten Teile nur auf Bestellung gearbeitet werden. Anbieter von Möbeln oder auch Fenstern und ähnlichen Elementen für den Außenbereich müssen nicht mehr große Mengen Folie abnehmen und in der Folge lagern, wenn für den eingegangenen Auftrag die Standardfolienrolle nicht aufgebraucht wird.Thus, according to the invention, it is possible to use a quantity of a few meters, for example, for discarding. 1 to 2 m. Due to the high speed of the printing process, it is possible to economically produce a small series from a few hundred to several thousand meters. This is particularly interesting in unusual colors or decors, which could not be realized with reasonable effort so far. Designers and architects are thus given a completely new individuality. But also in the production can be worked even more on a production of the decorated with the foil parts only to order. Providers of furniture or even windows and similar elements for outdoor use no longer have to remove large quantities of foil and subsequently store it if the standard roll of film is not used up for the order received.

Es ist viel leichter möglich, auch ganz individuelle Designwünsche zu bemustern und dann die benötigte Kleinmenge Folie herzustellen. Dank des digitalen Druckverfahrens kann das individuelle Design gespeichert und bei Bedarf jederzeit wieder abgerufen werden. Dies stellt einen großen Vorteil dar, weil z.B. der Nachkauf von Möbeln noch nach Jahren möglich ist. Auch bei notwendigen Reparaturen an Fenstern, Türen etc. oder bei einem nachträglichen Einbau weiterer Fenster kann problemlos das passende Dekor geliefert werden.It is much easier possible to sample even individual design requests and then produce the required small amount of foil. Thanks to the digital printing process, the individual design can be saved and retrieved whenever needed. This is a great advantage because e.g. the purchase of furniture is still possible after years. Even with necessary repairs to windows, doors, etc. or with subsequent installation of additional windows, the matching decor can be delivered without any problem.

Die Erfindung bezieht sich auch auf sämtliche Kombinationen von bevorzugten Ausgestaltungen, soweit diese sich nicht gegenseitig ausschließen. Die Angaben "etwa" oder "ca." in Verbindung mit einer Zahlenangabe bedeuten, dass zumindest um 10 % höhere oder niedrigere Werte oder um 5 % höhere oder niedrigere Werte und in jedem Fall um 1 % höhere oder niedrigere Werte eingeschlossen sind.The invention also relates to all combinations of preferred embodiments, as far as these are not mutually exclusive. The information "about" or "approx." in conjunction with a numerical indication, means that at least 10% higher or lower values or 5% higher or lower values and in any case 1% higher or lower values are included.

Vergleichsbeispiel 1: Digitaldruck im single pass Verfahren mit wasserbasierenden Druckfarben auf PVC-FolienComparative Example 1 Digital Printing in a Single Pass Process Using Water-based Printing Inks on PVC Films

Bei einem Druckmaschinenhersteller wurden auf einer Produktionsanlage Druckversuche mit unterschiedlichen PVC-Folien der Renolit AG durchgeführt. Die Anlage war zum Bedrucken von Papier mit wässrigen Druckfarben gebaut worden.At a printing press manufacturer, printing tests were carried out with different PVC films from Renolit AG on a production line. The plant had been built for printing paper with aqueous inks.

Maschinendaten:Machine data:

  • Druckbreite: max. 200 mmPrinting width: max. 200 mm
  • Druckköpfe: Xaar 760 (Top shooter)Printheads: Xaar 760 (Top shooter)
  • Druckgeschwindigkeit: max. 25 m/minPrinting speed: max. 25 m / min
  • Trocknungseinrichtung: IR-StrahlerDrying device: IR emitter

Als erster Versuch wurde das Standardträgermaterial Papier bedruckt, das sich ohne Problem drucken und trocknen ließ. Anschließend wurde eine halbharte Transparentfolie aus PVC mit einer Dicke von 100 µm bedruckt. Die Folie konnte zwar bedruckt werden, aber die Druckfarbe lies sich nicht trocknen und legte sich teilweise an der Anpresswalze ab. Daraufhin wurde die Strahlerleistung des IR-Strahlers angehoben. Dies zeigte keine Verbesserung. Die Strahler konnten auch nur begrenzt in der Leistung angehoben werden, da die Folie wellig wurde, die Druckköpfe streifte und somit den Druck beschädigte. Auch die Reduzierung der Geschwindigkeit auf ca. 8 m/min zeigte keine Verbesserung. Nach einem Maschinenstillstand wurde eine Folienprobe zwischen dem Auslauf der Druckeinheit und Anpresswalze entnommen und zur Seite gelegt. Beim Abtasten der Oberfläche konnte der Druck abgewischt werden - selbst nach einer längeren Lagerzeit von einer Woche. Das gleiche Verhalten zeigte eine harte, eingefärbte PVC-Folie mit einer Dicke von 100 um. Ein auf Papier abgestimmtes Druckfarbensystem mit wasserbasierten Tinten ist somit für PVC-Folien ungeeignet.As a first attempt the standard carrier paper was printed, which could be printed and dried without problem. Subsequently, a semi-rigid transparent film made of PVC was printed with a thickness of 100 microns. The film could indeed be printed, but the ink did not dry and lay down partially on the pressure roller. Then the radiator power of the IR radiator was raised. This showed no improvement. The spotlights could also be increased in performance only to a limited extent because the film was wavy, the printheads grazed and thus damaged the pressure. The reduction of the speed to about 8 m / min showed no improvement. After a machine downtime, a film sample was taken between the outlet of the printing unit and pressure roller and set aside. When scanning the surface, the pressure could be wiped off - even after a prolonged storage period of one week. The same behavior was exhibited by a hard, colored PVC film having a thickness of 100 μm. A paper-based ink system with water-based inks is therefore unsuitable for PVC films.

Mikroskopaufnahmen zeigen dies noch besser. Die Druckpunkte sind beim Papier wie in Figur 2 gezeigt nahezu rund. Im Gegensatz dazu verlaufen bei der PVC-Folie die Tröpfchen, wenn sie zur Farbmischung übereinander gedruckt werden, siehe Figur 3.Microscope images show this even better. The pressure points are on paper as in FIG. 2 shown almost round. In contrast, with the PVC film, when the droplets are printed over one another for color mixing, see FIG. 3 ,

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Foliefoil
2a2a
Druckköpfeprintheads
2b2 B
Druckköpfeprintheads
33
Steuerungcontrol

Claims (7)

  1. Method for producing color matches or small-batch series of printed plastic film, in which the print is identical to the print produced by means of the rotogravure method in terms of resolution and colours, characterized in that the film (1) is printed with a speed from 20 to 40 m/min. by means of an array of stationary print heads (2a, 2b) in an ink jet method using a solvent based ink, wherein the ink contains the same dyes and/or pigments, wherein the viscosity and the properties of the ink are adjusted to the ink jet printing method, and a controller (3) controls the application of the ink locally and in terms of quantity such that a rotogravure application is simulated.
  2. Method according to claim 1, characterized in that the viscosity of the ink is in the range of < 15mPa•s.
  3. Method according to claim 1, characterized in that the fineness of the pigments is adjusted to the ink jet printing method and resulting color deviations are compensated for by varying the quantities.
  4. Method according to claim 1 or 2, characterized in that between 1 m and 3000 m of film are printed.
  5. Method according to any one of claims 1 to 3, characterized in that a colorimeter is used to monitor color and print consistency.
  6. Method according to any one of claims 1 to 4, characterized in that a pattern for ink jet printing is obtained by scanning an existing printed film, veneers and other arbitrary surfaces.
  7. Method according to any one of claims 1 to 4, characterized in that a rotogravure cylinder is produced in accordance with the data for the ink jet printing process.
EP10757565.6A 2009-09-11 2010-08-30 Printing plastic films using a digital printer having stationary print heads for production orders with small lot sizes Active EP2475525B2 (en)

Priority Applications (3)

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SI201030856T SI2475525T2 (en) 2009-09-11 2010-08-30 Printing plastic films using a digital printer having stationary print heads for production orders with small lot sizes
PL10757565T PL2475525T5 (en) 2009-09-11 2010-08-30 Printing plastic films using a digital printer having stationary print heads for production orders with small lot sizes
HRP20141220TT HRP20141220T4 (en) 2009-09-11 2014-12-16 Printing plastic films using a digital printer having stationary print heads for production orders with small lot sizes

Applications Claiming Priority (2)

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DE102009040937 2009-09-11
PCT/EP2010/005313 WO2011029539A1 (en) 2009-09-11 2010-08-30 Printing plastic films using a digital printer having stationary print heads for production orders with small lot sizes

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PT (1) PT2475525E (en)
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DK2475525T4 (en) * 2009-09-11 2020-01-13 Renolit Se Printing of plastic sheets using a digital printer with stationary print heads for small production orders
ES2609673T3 (en) * 2013-03-14 2017-04-21 Flooring Technologies Ltd. Procedure for generating decorative prints of identical quality regardless of the printing procedure used and a device for performing this procedure
RU190959U1 (en) * 2019-02-25 2019-07-17 Григорий Борисович Куликов Device for tensioning the film during unwinding and printing

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CA2773160C (en) 2017-08-15
DK2475525T3 (en) 2015-01-12
HRP20141220T4 (en) 2020-01-24
EP2475525A1 (en) 2012-07-18
EP2475525B1 (en) 2014-11-12
CA2773160A1 (en) 2011-03-17
HRP20141220T1 (en) 2015-05-08
US8915564B2 (en) 2014-12-23
WO2011029539A1 (en) 2011-03-17
PT2475525E (en) 2015-02-05
EA201200403A1 (en) 2012-08-30
DK2475525T4 (en) 2020-01-13
SI2475525T2 (en) 2020-02-28
PL2475525T3 (en) 2015-04-30
EA025621B1 (en) 2017-01-30
ES2528015T3 (en) 2015-02-03
UA107198C2 (en) 2014-12-10
ES2528015T5 (en) 2020-04-21
PL2475525T5 (en) 2020-02-28
US20120176433A1 (en) 2012-07-12

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