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EP2361186B1 - Ink jet printer - Google Patents

Ink jet printer Download PDF

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Publication number
EP2361186B1
EP2361186B1 EP09771373.9A EP09771373A EP2361186B1 EP 2361186 B1 EP2361186 B1 EP 2361186B1 EP 09771373 A EP09771373 A EP 09771373A EP 2361186 B1 EP2361186 B1 EP 2361186B1
Authority
EP
European Patent Office
Prior art keywords
ink jet
printing
jet printer
air
printer according
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.)
Not-in-force
Application number
EP09771373.9A
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German (de)
French (fr)
Other versions
EP2361186A1 (en
Inventor
Erich Willinger
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.)
Basler lacke AG
Original Assignee
Basler lacke AG
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Filing date
Publication date
Application filed by Basler lacke AG filed Critical Basler lacke AG
Priority to SI200930811T priority Critical patent/SI2361186T1/en
Priority to EP09771373.9A priority patent/EP2361186B1/en
Publication of EP2361186A1 publication Critical patent/EP2361186A1/en
Application granted granted Critical
Publication of EP2361186B1 publication Critical patent/EP2361186B1/en
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Anticipated expiration legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0022Curing or drying the ink on the copy materials, e.g. by heating or irradiating using convection means, e.g. by using a fan for blowing or sucking air

Definitions

  • the present invention relates to an ink-jet printing apparatus for printing non-absorbent surface printing media with water-based inks, comprising a printing table, a feeding device for conveying a printing medium in a feed direction, and a transversely displaceable printhead carriage with printheads.
  • aqueous inks for printing uncoated substrates by means of ink jet printing technology is known from US Pat DE-A-103 47 034 known.
  • the use of the ink in the inkjet printing system is provided with at least one heating device in the form of a heating plate and / or an infrared heater.
  • the heating plate is arranged directly below, before and / or after the print head, so that the heating plate extends over the entire path covered by the print head.
  • an infrared radiator arranged above the surface to be printed is provided as the heating device.
  • a major disadvantage of this printing system is that it is only suitable for printing on thermally stable substrates.
  • the US-A-4,340,893 discloses an ink jet printer having an ink drying apparatus with louvers disposed on either side of the printhead for impinging the substrate to be imprinted immediately after printing with an optionally heated air stream.
  • the US 6,116,728 discloses an ink jet printer with a drying device.
  • the invention is based on the object to provide an ink jet printing device of the type mentioned, with which can be fixed at each pass from the printheads incident on the printing medium ink droplets before the droplets run and lead to a significant deterioration in print quality. Another object of the invention is to avoid banding.
  • the slot die is preferably directed onto a printable area of the print heads during a pass in the form of a print strip.
  • the slot nozzle is preferably arranged inclined with respect to a vertical at an angle, wherein the diaper is preferably between 5 and 15 °, in particular approximately between 6 and 10 °.
  • To generate a uniform air jet over the entire mouth opening in the transverse direction of the air duct is preferably divided by at least one provided with air passage openings partition in at least two sub-channels.
  • the blower is preferably infinitely variable in its strength.
  • the blower is preferably associated with a heating device with preferably infinitely variable temperature.
  • the printhead carriage may be equipped with an air baffle and / or with Lucasabehrsblechen to reduce under the slide forming air vortices.
  • ink jet printing device with water-based inks printed plastic films are particularly suitable for decorating and protecting articles made of composite materials, especially sports and leisure equipment, such as skis, snowboards, skateboards surfboards and the like objects with decorative surface design.
  • the printing medium 14 which is usually in the form of rolls, is guided over the printing table 12 in the feed direction x by means of transport rollers 16, 18 of a feed device 20.
  • the printing medium 14 rests flat in the printing area on the printing table 12, 12 openings 13 are provided for generating a negative pressure acting on the back of the resting on the printing table 12 print medium 14 in a horizontal support surface 11 of the printing table.
  • the printing medium 14 is usually a film or a thin plate of a thermoplastic material, such as polyamide, ABS / TPU, PVC, PE.
  • the plastics have a non-absorbent surface.
  • water-based inks are used.
  • a printhead carriage 22 with, for example, eight printheads 24.
  • the printing technology is piezo inkjet printing.
  • the print head carriage 22 is slidably guided in the transverse direction y on two guide rods 26, 28 arranged parallel to one another and at a right angle to the feed direction x.
  • the printing process takes place in successive displacement movements - the so-called fitting - of the print head carriage 22 in the transverse direction y
  • On each pass is carried out by means of the print heads 24 an order of color dots on the printing medium 14 within a print strip 30 of a width b of z. B. 12 mm, which is part of the entire print image.
  • the printing medium 14 is transported by means of the transport rollers 16, 18 of the feed device 20 in the feed direction x by one of the width b of the print strip 30 generated during a pass corresponding distance forward. This process is repeated until completion of the entire print image to be printed.
  • the air duct 32 has a substantially rectangular outer cross section and is internally provided with two dividing walls 33a, 33b extending over the entire length of the air duct 32 and dividing the air duct 32 into three subchannels 32a, 32b, 32c.
  • a further dividing wall 33c separates the partial passage 32c from the wedge-shaped slot nozzle 34.
  • the dividing walls 33a, 33b, 33c are provided with air passage openings 38 distributed substantially regularly over the entire length of the air-guiding passage 32.
  • the air passage openings 38 may, for example, consist of several rows of longitudinal slots extending parallel to one another and extending in the transverse direction y, the longitudinal slots being arranged offset from one another, for example, relative to one another ( Fig. 4 ). In principle, however, all forms of air passage openings 38 are possible, which lead to a uniform over the entire length of the air duct 32 air flow at the mouth opening 36 of the slot nozzle 34.
  • the two walls 40, 42 bordering the slot nozzle 34 are curved in the region of the mouth opening 36 in such a way that a plane of symmetry of the walls 40, 42 in the mouth region relative to the vertical one of the outflow direction of an air jet S from the slot nozzle 34 corresponding angle ⁇ of about 8th °. Due to the possibilities provided for a parallel displacement of the air duct 32 in the feed direction x and by tilting the position of the air duct 32 relative to the vertical, the impact point or the Impact line of the air jet S flowing out of the slit nozzle 34 exactly on the way in the transverse direction y of the printheads 24 traversable way, ie on the pressure strip 30 generated during a pass set.
  • this controller 50 calculates the required control signals of the respective constituent components of the ink jet printing apparatus 10. To do so, the controller 50 is provided with carriage control for moving the printhead carriage 22 in the transverse direction y, with a feed control for controlling the feed device 20 for moving the print medium 14 in the feed direction x and a nozzle control for controlling the nozzles 24 for ejecting colored ink droplets 48 connected to the print medium 14.
  • the air jet S causes a partial evaporation of the water in the ink droplets 48.
  • the optimum water evaporation can be adjusted by appropriate preheating and drying of the air.
  • the flattened and due to the partial drying a higher pigment concentration having ink droplets 48a are fixed in this way on the surface of the printing medium 14 and prevented from bleeding ( Fig. 6 ).
  • the printhead carriage 22 is covered with an air jet emerging from the slit nozzle 32 forward air deflecting plate 52 in the feed direction.
  • the print head carriage 22 is equipped with a spoiler or air deflector plate 54, 56 against the printing table 12. The spoilers 54, 56 prevent the formation of air vortices under the printhead carriage 22.

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  • Ink Jet (AREA)

Description

TECHNISCHES GEBIETTECHNICAL AREA

Die vorliegende Erfindung betrifft eine Tintenstrahldruckvorrichtung zum Bedrucken von Bedruckmedien mit nicht saugfähiger Oberfläche mit wasserbasierten Tinten, mit einem Drucktisch, einer Vorschubeinrichtung zum Transport eines Bedruckmediums in einer Vorschubrichtung und einem in Querrichtung verschiebbaren Druckkopfschlitten mit Druckköpfen.The present invention relates to an ink-jet printing apparatus for printing non-absorbent surface printing media with water-based inks, comprising a printing table, a feeding device for conveying a printing medium in a feed direction, and a transversely displaceable printhead carriage with printheads.

STAND DER TECHNIKSTATE OF THE ART

Der Einsatz wässriger Tinten zum Bedrucken unbeschichteter Substrate mittels Tintenstrahldrucktechnologie ist aus der DE-A-103 47 034 bekannt. Um die verhältnismässig lange Trocknungszeit der Tinten in einem erträglichen Rahmen zu halten, ist die Verwendung der Tinte in Tintenstrahldrucksystem mit mindestens einer Heizvorrichtung in Form einer Heizplatte und/oder einer Infrarotheizung vorgesehen. Hierbei ist die Heizplatte direkt unterhalb, vor und/oder nach dem Druckkopf angeordnet, so dass sich die Heizplatte über die gesamte Bahn, die der Druckkopf zurücklegt, erstreckt. Alternativ oder zusätzlich ist ein oberhalb der zu bedruckenden Oberfläche angeordneter Infrarotstrahler als Heizvorrichtung vorgesehen. Ein wesentlicher Nachteil dieses Drucksystems liegt darin, dass es nur zum Bedrucken thermisch stabiler Substrate geeignet ist.The use of aqueous inks for printing uncoated substrates by means of ink jet printing technology is known from US Pat DE-A-103 47 034 known. In order to keep the relatively long drying time of the inks within a tolerable range, the use of the ink in the inkjet printing system is provided with at least one heating device in the form of a heating plate and / or an infrared heater. In this case, the heating plate is arranged directly below, before and / or after the print head, so that the heating plate extends over the entire path covered by the print head. Alternatively or additionally, an infrared radiator arranged above the surface to be printed is provided as the heating device. A major disadvantage of this printing system is that it is only suitable for printing on thermally stable substrates.

Die US-A-4 340 893 offenbart einen Tintenstrahldrucker mit einer Tintentrocknungsvorrichtung mit beidseits des Druckkopfs angeordneten Luftschlitzen zur Beaufschlagung des zu bedruckenden Substrats unmittelbar nach dem Bedrucken mit einem gegebenenfalls erwärmten Luftstrom.The US-A-4,340,893 discloses an ink jet printer having an ink drying apparatus with louvers disposed on either side of the printhead for impinging the substrate to be imprinted immediately after printing with an optionally heated air stream.

Die US 6 116 728 offenbart einen Tintenstrahldrucker mit einer Trocknungsvorrichtung.The US 6,116,728 discloses an ink jet printer with a drying device.

Mit den aus dem Stand der Technik bekannten Tintenstrahldruckvorrichtungen lassen sich beim Bedrucken von Bedruckmedien mit nicht saugfähiger Oberfläche mit wasserbasierten Tinten ein Verlaufen der Tintentröpfchen und eine unerwünschte Streifenbildung nicht vermeiden.With the inkjet printing devices known from the prior art, it is not possible to avoid bleeding of the ink droplets and undesirable banding when printing on non-absorbent surface print media with water-based inks.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Der Erfindung liegt die Aufgabe zu Grunde, eine Tintenstrahldruckvorrichtung der eingangs genannten Art zu schaffen, mit welcher sich die bei jedem Pass von den Druckköpfen auf dem Bedruckmedium auftreffenden Tintentröpfchen fixieren lassen, bevor die Tröpfchen verlaufen und zu einer erheblichen Verschlechterung der Druckqualität führen. Ein weiteres Ziel der Erfindung ist die Vermeidung von Streifenbildung.The invention is based on the object to provide an ink jet printing device of the type mentioned, with which can be fixed at each pass from the printheads incident on the printing medium ink droplets before the droplets run and lead to a significant deterioration in print quality. Another object of the invention is to avoid banding.

Zur erfindungsgemässen Lösung der Aufgabe führt, dass oberhalb des Drucktisches ein sich über den vom Druckkopfschlitten in Querrichtung überfahrbaren Druckbereich erstreckender und mit einem Gebläse verbundener Luftführungskanal mit einer Schlitzdüse mit in Querrichtung verlaufender und gegen die Auflagefläche des Drucktisches gerichteter Mündungsöffnung angeordnet ist, und dass der Luftführungskanal zur Ausrichtung der Schlitzdüse in Vorschubrichtung parallel verschiebbar und gegenüber einer Vertikalen kippbar ausgebildet ist.To the inventive solution of the problem results in that above the printing table a extending over the print head carriage in the transverse direction of pressure range extending and connected to a fan air duct with a slot nozzle with transversely directed and directed against the support surface of the printing table mouth opening is arranged, and that the air duct for aligning the slot nozzle in the feed direction is parallel displaceable and formed tiltable relative to a vertical.

Die Schlitzdüse wird bevorzugt auf einen von den Druckköpfen während eines Passes in Querrichtung bedruckbaren Bereich in Form eines Druckstreifens gerichtet.The slot die is preferably directed onto a printable area of the print heads during a pass in the form of a print strip.

Im Bereich der Mündungsöffnung ist die Schlitzdüse vorzugsweise gegenüber einer Vertikalen um einen Winkel geneigt angeordnet, wobei der Windel bevorzugt zwischen 5 und 15°, insbesondere etwa zwischen 6 und 10° liegt.In the region of the mouth opening, the slot nozzle is preferably arranged inclined with respect to a vertical at an angle, wherein the diaper is preferably between 5 and 15 °, in particular approximately between 6 and 10 °.

Zur Erzeugung eines gleichmässigen Luftstrahls über die gesamte Mündungsöffnung in Querrichtung ist der Luftführungskanal bevorzugt durch wenigstens eine mit Luftdurchtrittsöffnungen versehene Trennwand in wenigsten zwei Teilkanäle unterteilt.To generate a uniform air jet over the entire mouth opening in the transverse direction of the air duct is preferably divided by at least one provided with air passage openings partition in at least two sub-channels.

Das Gebläse ist in seiner Stärke vorzugsweise stufenlos verstellbar. Zur Vorwärmung der Luft ist dem Gebläse bevorzugt eine Heizeinrichtung mit vorzugsweise stufenlos regelbarer Temperatur zugeordnet ist.The blower is preferably infinitely variable in its strength. For preheating the air, the blower is preferably associated with a heating device with preferably infinitely variable temperature.

Der Druckkopfschlitten kann zur Verminderung von unter dem Schlitten sich bildenden Luftwirbeln mit einem Luftleitblech und/oder mit Luftabweisungsblechen ausgestattet sein.The printhead carriage may be equipped with an air baffle and / or with Luftabweisungsblechen to reduce under the slide forming air vortices.

Mit der erfindungsgemässen Tintenstrahldruckvorrichtung mit wasserbasierten Tinten bedruckte Kunststofffolien eignen sich insbesondere zum Dekorieren und Schützen von Gegenständen aus Verbundwerkstoffen, insbesondere Sport- und Freizeitgeräten, wie Skis, Snowboards, Skateboards Surfbretter und dergleichen Gegenstände mit dekorativ gestalteter Oberfläche.With the inventive ink jet printing device with water-based inks printed plastic films are particularly suitable for decorating and protecting articles made of composite materials, especially sports and leisure equipment, such as skis, snowboards, skateboards surfboards and the like objects with decorative surface design.

KURZE BESCHREIBUNG DER ZEICHNUNGBRIEF DESCRIPTION OF THE DRAWING

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung, die lediglich zur Erläuterung dient und nicht einschränkend auszulegen ist. Die Zeichnung zeigt schematisch in

Fig. 1
eine Frontansicht einer Tintenstrahldruckvorrichtung;
Fig. 2
eine teilweise geschnittene Seitenansicht der Tintenstrahldruckvorrichtung von Fig. 1 mit Luftführungskanal in vergrösserter Darstellung in Blickrichtung A;
Fig. 3
einen Schnitt durch den Luftführungskanal von Fig. 1 nach der Linie I-I in vergrösserter Darstellung;
Fig. 4
die Draufsicht auf eine Trennwand des Luftführungskanals von Fig. 3;
Fig. 5
einen Schnitt durch eine frisch bedruckte Oberfläche eines Bedruckmediums vor der Fixierung der Tintentröpfchen in vergrösserter Darstellung;
Fig. 6
den Schnitt durch die frisch bedruckte Oberfläche gemäss Fig. 5 nach der Fixierung der Tintentröpfchen.
Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing, which is merely illustrative and not restrictive interpreted. The drawing shows schematically in
Fig. 1
a front view of an ink-jet printing device;
Fig. 2
a partially sectioned side view of the ink jet printing device of Fig. 1 with air duct in an enlarged view in the direction A;
Fig. 3
a section through the air duct of Fig. 1 on the line II in an enlarged view;
Fig. 4
the top view of a partition wall of the air duct of Fig. 3 ;
Fig. 5
a section through a freshly printed surface of a printing medium before the fixation of the ink droplets in an enlarged view;
Fig. 6
the section through the freshly printed surface according to Fig. 5 after fixing the ink droplets.

BESCHREIBUNG BEVORZUGTER AUSFÜHRUNGSFORMENDESCRIPTION OF PREFERRED EMBODIMENTS

Eine in den Fig. 1 und 2 gezeigte Tintenstrahldruckvorrichtung 10 weist einen horizontal angeordneten Drucktisch 12 als Auflage für ein Bedruckmedium 14 auf. Das üblicherweise als Rollenware vorliegende Bedruckmedium 14 wird mittels Transportwalzen 16, 18 einer Vorschubeinrichtung 20 in Vorschubrichtung x über den Drucktisch 12 geführt. Damit das Bedruckmedium 14 im Druckbereich auf dem Drucktisch 12 flach aufliegt, sind in einer horizontalen Auflagefläche 11 des Drucktisches 12 Öffnungen 13 zur Erzeugung eines auf die Rückseite des auf dem Drucktisch 12 aufliegenden Bedruckmediums 14 wirkenden Unterdrucks vorgesehen. Das Bedruckmedium 14 ist üblicherweise eine Folie oder eine dünne Platte aus einem thermoplastischen Kunststoff, wie z.B. Polyamid, ABS/TPU, PVC, PE. Die Kunststoffe weisen eine nicht saugfähige Oberfläche auf. Zur Bedruckung werden wasserbasierte Tinten verwendet.One in the Fig. 1 and 2 shown inkjet printing device 10 has a horizontally arranged printing table 12 as a support for a printing medium 14. The printing medium 14, which is usually in the form of rolls, is guided over the printing table 12 in the feed direction x by means of transport rollers 16, 18 of a feed device 20. Thus, the printing medium 14 rests flat in the printing area on the printing table 12, 12 openings 13 are provided for generating a negative pressure acting on the back of the resting on the printing table 12 print medium 14 in a horizontal support surface 11 of the printing table. The printing medium 14 is usually a film or a thin plate of a thermoplastic material, such as polyamide, ABS / TPU, PVC, PE. The plastics have a non-absorbent surface. For printing, water-based inks are used.

Oberhalb des Drucktisches 12 und in kurzer Distanz zu dessen Auflagefläche befindet sich ein Druckkopfschlitten 22 mit beispielsweise acht Druckköpfen 24. Die Drucktechnologie ist Piezo-Tintenstrahldruck. Der Druckkopfschlitten 22 ist an zwei parallel zu einander und rechtwinklig zur Vorschubrichtung x angeordneten Führungsstangen 26, 28 in Querrichtung y gleitend geführt. Der Druckvorgang erfolgt in aufeinander folgenden Verschiebebewegungen -- den sog. Passen -- des Druckkopfschlittens 22 in Querrichtung y über die zu bedruckende Breite des Bedruckmediums 14. Bei jedem Pass erfolgt mittels der Druckköpfe 24 ein Auftrag von Farbpunkten auf dem Bedruckmedium 14 innerhalb eines Druckstreifens 30 einer Breite b von z. B. 12 mm, der Teil des gesamten Druckbildes ist. Zwischen jeweils zwei aufeinander folgenden Passen wird das Bedruckmedium 14 mittels der Transportwalzen 16, 18 der Vorschubeinrichtung 20 in Vorschubrichtung x um eine der Breite b des während eines Passes erzeugten Druckstreifens 30 entsprechende Distanz vorwärts transportiert. Dieser Vorgang wiederholt sich bis zur Fertigstellung des gesamten zu druckenden Druckbildes.Above the printing table 12 and at a short distance to its support surface is a printhead carriage 22 with, for example, eight printheads 24. The printing technology is piezo inkjet printing. The print head carriage 22 is slidably guided in the transverse direction y on two guide rods 26, 28 arranged parallel to one another and at a right angle to the feed direction x. The printing process takes place in successive displacement movements - the so-called fitting - of the print head carriage 22 in the transverse direction y On each pass is carried out by means of the print heads 24 an order of color dots on the printing medium 14 within a print strip 30 of a width b of z. B. 12 mm, which is part of the entire print image. Between two successive passes, the printing medium 14 is transported by means of the transport rollers 16, 18 of the feed device 20 in the feed direction x by one of the width b of the print strip 30 generated during a pass corresponding distance forward. This process is repeated until completion of the entire print image to be printed.

Oberhalb des Drucktisches 12 ist ein sich über den gesamten, vom Druckkopfschlitten 22 überfahrbaren Druckbereich erstreckender, an seinen beiden Stirnseiten geschlossener Luftführungskanal 32 mit einer Schlitzdüse 34 mit in Querrichtung y verlaufender Mündungsöffnung 36 angeordnet. Der Luftführungskanal 32 weist einen im Wesentlichen rechteckigen äusseren Querschnitt auf und ist im Inneren mit zwei sich über die ganze Länge des Luftführungskanals 32 erstreckenden und den Luftführungskanal 32 in drei Teilkanäle 32a, 32b, 32c unterteilenden Trennwänden 33a, 33b ausgestattet. Eine weitere Trennwand 33c trennt den Teilkanal 32c von der keilförmig zulaufenden Schlitzdüse 34. Die Trennwände 33a, 33b, 33c sind mit im Wesentlichen regelmässig über die ganze Länge des Luftführungskanals 32 verteilt angeordneten Luftdurchtrittsöffnungen 38 versehen. Die Luftdurchtrittsöffnungen 38 können beispielsweise aus mehreren parallel zu einander liegenden, in Querrichtung y verlaufenden Reihen von Längsschlitzen bestehen, wobei die Längsschlitze aus benachbarten Reihen z.B. gegeneinander versetzt angeordnet sind (Fig. 4). Grundsätzlich sind jedoch alle Formen von Luftdurchtrittsöffnungen 38 möglich, die zu einem über die ganze Länge des Luftführungskanals 32 gleichmässig starken Luftstrom an der Mündungsöffnung 36 der Schlitzdüse 34 führen.Above the printing table 12 is an over the entire, from the print head carriage 22 traversable pressure range extending, closed at its two end faces air duct 32 with a slot nozzle 34 with extending in the transverse direction y mouth opening 36 is arranged. The air duct 32 has a substantially rectangular outer cross section and is internally provided with two dividing walls 33a, 33b extending over the entire length of the air duct 32 and dividing the air duct 32 into three subchannels 32a, 32b, 32c. A further dividing wall 33c separates the partial passage 32c from the wedge-shaped slot nozzle 34. The dividing walls 33a, 33b, 33c are provided with air passage openings 38 distributed substantially regularly over the entire length of the air-guiding passage 32. The air passage openings 38 may, for example, consist of several rows of longitudinal slots extending parallel to one another and extending in the transverse direction y, the longitudinal slots being arranged offset from one another, for example, relative to one another ( Fig. 4 ). In principle, however, all forms of air passage openings 38 are possible, which lead to a uniform over the entire length of the air duct 32 air flow at the mouth opening 36 of the slot nozzle 34.

Wie aus den Fig. 2 und 3 ersichtlich, verlaufen die beiden die Schlitzdüse 34 begrenzenden Wände 40, 42 im Bereich der Mündungsöffnung 36 derart gekrümmt, dass eine Symmetrieebene der Wände 40, 42 im Mündungsbereich gegenüber der Vertikalen einen der Ausströmrichtung eines Luftstrahls S aus der Schlitzdüse 34 entsprechenden Winkel α von etwa 8° aufweist. Durch die vorgesehenen Möglichkeiten einer Parallelverschiebung des Luftführungskanals 32 in Vorschubrichtung x und durch Kippen der Stellung des Luftführungskanals 32 gegenüber der Vertikalen lässt sich der Auftreffpunkt bzw. die Auftrefflinie des aus der Schlitzdüse 34 ausströmenden Luftstrahls S genau auf den in Querrichtung y von den Druckköpfen 24 überfahrbaren Weg, d.h. auf den während eines Passes erzeugten Druckstreifen 30, einstellen.Like from the Fig. 2 and 3 4, the two walls 40, 42 bordering the slot nozzle 34 are curved in the region of the mouth opening 36 in such a way that a plane of symmetry of the walls 40, 42 in the mouth region relative to the vertical one of the outflow direction of an air jet S from the slot nozzle 34 corresponding angle α of about 8th °. Due to the possibilities provided for a parallel displacement of the air duct 32 in the feed direction x and by tilting the position of the air duct 32 relative to the vertical, the impact point or the Impact line of the air jet S flowing out of the slit nozzle 34 exactly on the way in the transverse direction y of the printheads 24 traversable way, ie on the pressure strip 30 generated during a pass set.

Von einem Gebläse 44 mit diesem zugeordneter Heizeinrichtung zur Luftvorwärmung erfolgt über ein Zufuhrrohr 46 die Zufuhr von Luft in den Luftführungskanal 32 auf der in Fig. 1 linken Seite in den von der Schlitzdüse 34 am weitesten entfernten Teilkanal 32a. Durch die als Schikanen im Luftströmungsweg innerhalb des Luftführungskanals 32 angeordneten Trennwände 33a, 33b, 33c ergibt sich eine konstante Luftaustuittsgeschwindigkeit an der Mündungsöffnung 36 der Schlitzdüse 34 und damit ein konstanter Druck des während eines Passes auf den Druckstreifen 30 auftreffenden Luftstrahls S. Über eine Steuerung ist die Gebläsestärke bzw. die Geschwindigkeit des Luftstrahls S stufenlos einstellbar. Die Heizeinrichtung ist stufenlos temperaturregelbar von Raumtemperatur bis 60°.From a fan 44 with this associated heater for air preheating via a supply pipe 46, the supply of air into the air duct 32 on the in Fig. 1 left side in the of the slot nozzle 34 farthest sub-channel 32a. By arranged as baffles in the air flow path within the air duct 32 partitions 33a, 33b, 33c results in a constant Luftaustuittsgeschwindigkeit at the mouth opening 36 of the slot nozzle 34 and thus a constant pressure of the incident during a pass on the pressure strip 30 air jet S. About a controller the fan speed or the speed of the air jet S continuously adjustable. The heater is infinitely adjustable in temperature from room temperature to 60 °.

Zur Steuerung der Tintenstrahldruckvorrichtung 10 ist diese mit einer Steuereinrichtung 50 verbunden. Auf der Grundlage von digitalen Bilddaten, die in die Steuereinrichtung 50 eingegeben werden, erfolgt in dieser Steuereinrichtung 50 eine Berechnung der erforderlichen Steuersignale der entsprechenden Einzelkomponenten der Tintenstrahldruckvorrichtung 10. Dazu ist die Steuereinrichtung 50 mit einer Schlittensteuerung zum Bewegen des Druckkopfschlittens 22 in der Querrichtung y, mit einer Vorschubsteuerung zur Ansteuerung der Vorschubvorrichtung 20 zur Bewegung des Bedruckmediums 14 in der Vorschubrichtung x und einer Düsensteuerung zur Ansteuerung der Düsen 24 zum Ausstossen farbiger Tintentröpfchen 48 auf das Bedruckmedium 14 verbunden.To control the ink jet printing device 10, this is connected to a control device 50. Based on digital image data input to the controller 50, this controller 50 calculates the required control signals of the respective constituent components of the ink jet printing apparatus 10. To do so, the controller 50 is provided with carriage control for moving the printhead carriage 22 in the transverse direction y, with a feed control for controlling the feed device 20 for moving the print medium 14 in the feed direction x and a nozzle control for controlling the nozzles 24 for ejecting colored ink droplets 48 connected to the print medium 14.

Die von den Druckköpfen 24 auf dem Bedruckmedium 14 auftreffenden Tintentröpfchen 48 führen auf der nicht saugfähigen Oberfläche des Bedruckmediums 14 wegen der hohen Oberflächenspannung von Wasser zu einem stark gewölbten Tröpfchenoberfläche (Fig. 5). Die Beaufschlagung der während eines Passes in der Form eines Druckstreifens 30 frisch auf die Oberfläche des Bedruckmediums 14 auftreffenden Tintentröpfchen 48 mit einem Luftstrahl S mit auf den Wassergehalt und die Farbzusammensetzung der eingesetzten Druckfarben abgestimmten Luftvolumen und der Strömungsgeschwindigkeit bzw. dem sich daraus ergebenden Luftdruck beim Auftreffen des Luftstrahls S auf dem frischen Druckstreifen 30 wirkt der Oberflächenspannung der Tintentröpfchen 48 entgegen und zu einer Abflachung bzw. Verbreiterung der Tintentröpfchen 48. Gleichzeitig bewirkt der Luftstrahl S ein teilweises Verdampfen des Wassers in den Tintentröpfchen 48. Die optimale Wasserverdampfung kann durch entsprechendes Vorwärmen und damit Trocknen der Luft eingestellt werden. Die abgeflachten und wegen der teilweisen Trocknung eine höhere Pigmentkonzentration aufweisenden Tintentröpfchen 48a werden auf diese Weise an der Oberfläche des Bedruckmediums 14 fixiert und am Verlaufen gehindert (Fig. 6).The ink droplets 48 impinging on the print medium 14 by the print heads 24 lead to a strongly curved droplet surface on the non-absorbent surface of the print medium 14 because of the high surface tension of water ( Fig. 5 ). The application of an air jet S having fresh air impinging on the surface of the printing medium 14 during a pass in the form of a printing strip 30 with air volume S matched to the water content and the color composition of the printing inks used and the flow velocity or flow velocity the resulting air pressure upon impact of the air jet S on the fresh print strip 30 counteracts the surface tension of the ink droplets 48 and flattening the ink droplets 48. At the same time, the air jet S causes a partial evaporation of the water in the ink droplets 48. The optimum water evaporation can be adjusted by appropriate preheating and drying of the air. The flattened and due to the partial drying a higher pigment concentration having ink droplets 48a are fixed in this way on the surface of the printing medium 14 and prevented from bleeding ( Fig. 6 ).

Zur Vermeidung eines negativen Einflusses unerwünschter Luftströmungen unter dem Druckkopfschlitten 22 auf die Übertragung der Tintentröpfchen 48 von den Druckköpfen 24 auf die Oberfläche des Bedruckmediums 14 ist der Druckkopfschlitten 22 mit einem den aus der Schlitzdüse 32 austretenden Luftstrahl nach vorne in Vorschubrichtung ablenkenden Luftleitblech 52 überdeckt. An den beiden senkrecht zur Querrichtung angeordneten Seiten ist der Druckkopfschlitten 22 gegen den Drucktisch 12 hin mit je einem Spoiler oder Luftabweiserblech 54, 56 ausgestattet. Die Spoiler 54, 56 verhindern die Ausbildung von Luftwirbeln unter dem Druckkopfschlitten 22.To avoid a negative influence of unwanted air flows under the print head carriage 22 on the transfer of the ink droplets 48 from the printheads 24 to the surface of the print medium 14, the printhead carriage 22 is covered with an air jet emerging from the slit nozzle 32 forward air deflecting plate 52 in the feed direction. At the two sides arranged perpendicular to the transverse direction, the print head carriage 22 is equipped with a spoiler or air deflector plate 54, 56 against the printing table 12. The spoilers 54, 56 prevent the formation of air vortices under the printhead carriage 22.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

1010
TintenstrahldruckvorrichtungThe inkjet printing apparatus
1212
Drucktischprinting table
1313
Öffnungenopenings
1414
BedruckmediumBedruckmedium
1616
Transportwalzetransport roller
1818
Transportwalzetransport roller
2020
Vorschubeinrichtungfeeder
2222
DruckkopfschlittenPrint head carriage
2424
Druckköpfeprintheads
2626
Führungsstangeguide rod
2828
Führungsstangeguide rod
3030
Druckstreifenpressure strips
3232
LuftführungskanalAir duct
32a, 32b,32c32a, 32b, 32c
Teilkanälesubchannels
33a, 33b, 33c33a, 33b, 33c
Trennwändepartitions
3434
Schlitzdüseslot
3636
Mündungsöffnungmouth
3838
LuftdurchtrittsöffnungenAir passage openings
4040
Wand von 34Wall of 34
4242
Wand von 34Wall of 34
4444
Gebläse mit HeizvorrichtungBlower with heater
4646
Zufuhrrohrsupply pipe
48, 48a48, 48a
Tintentröpfchenink droplets
5050
Steuereinrichtung von 10Control device of 10
5252
LuftleitblechAir baffle
54, 5654, 56
Luftabweisungsbleche, SpoilerAir deflectors, spoilers
SS
Luftstrahlair jet
bb
Breite von 30Width of 30
xx
Vorschubrichtungfeed direction
yy
Querrichtungtransversely
αα
Winkelangle

Claims (10)

  1. Ink jet printer for printing printing media (14) having a non-absorbent surface with water-based inks, having a printing table (12), a feed device (20) for transporting a printing medium (14) in a feed direction (x) and a print head carriage (22) that can be displaced in the transverse direction (y) and has print heads (24), there being arranged above the printing table (12) an air guide duct (32) which extends over the printing area over which the print head carriage (22) can move in the transverse direction (y), is connected to a blower (44) and has a slot nozzle (34) with a mouth opening (36) running in the transverse direction (y) and aimed towards the supporting surface (11) of the printing table (12), characterized in that the air guide channel (32) is designed such that it can be displaced parallel to the feed direction (x) and tilted with respect to a vertical in order to align the slot nozzle (34).
  2. Ink jet printer according to Claim 1, characterized in that the air jet (S) emerging from the mouth opening (36) can be adjusted to the path over which the print heads (24) can travel in the transverse direction (Y).
  3. Ink jet printer according to Claim 1 or 2, characterized in that the printing medium with a non-absorbent surface is arranged between the supporting surface (11) of the printing table (12) and the mouth opening (36).
  4. Ink jet printer according to one of the preceding claims, characterized in that the slot nozzle (34) is aimed at a region in the form of a printing strip (30) that can be printed by the print heads (24) during a pass in the transverse direction (y).
  5. Ink jet printer according to one of the preceding claims, characterized in that the slot nozzle (34) in the region of the mouth opening (36) is arranged to be inclined at an angle (α) with respect to a vertical.
  6. Ink jet printer according to Claim 5, characterized in that the angle (α) lies between 5 and 15°, in particular approximately between 6 and 10°.
  7. Ink jet printer according to one of the preceding claims, characterized in that, in order to produce a uniform air jet (S) over the entire mouth opening (36), the air guide channel (32) is subdivided in the transverse direction (y) into at least two partial channels (32a, 32b, 32c) by means of at least one partition (33a, 33b, 33c) provided with air passage openings (38).
  8. Ink jet printer according to one of the preceding claims, characterized in that the intensity of the blower (44) can be adjusted preferably continuously.
  9. Ink jet printer according to Claim 8, characterized in that a heating device (46) with preferably continuously controllable temperature is assigned to the blower (44) in order to pre-heat the air.
  10. Ink jet printer according to one of the preceding claims, characterized in that the print head carriage (22) is equipped with an air guide plate (52) and/or with air deflection plates (54, 56) in order to reduce air vortices.
EP09771373.9A 2008-12-16 2009-12-14 Ink jet printer Not-in-force EP2361186B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200930811T SI2361186T1 (en) 2008-12-16 2009-12-14 Ink jet printer
EP09771373.9A EP2361186B1 (en) 2008-12-16 2009-12-14 Ink jet printer

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08405307A EP2199089A1 (en) 2008-12-16 2008-12-16 Ink jet printer
PCT/EP2009/067096 WO2010069930A1 (en) 2008-12-16 2009-12-14 Ink-jet printing apparatus
EP09771373.9A EP2361186B1 (en) 2008-12-16 2009-12-14 Ink jet printer

Publications (2)

Publication Number Publication Date
EP2361186A1 EP2361186A1 (en) 2011-08-31
EP2361186B1 true EP2361186B1 (en) 2013-10-02

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EP08405307A Withdrawn EP2199089A1 (en) 2008-12-16 2008-12-16 Ink jet printer
EP09771373.9A Not-in-force EP2361186B1 (en) 2008-12-16 2009-12-14 Ink jet printer

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Application Number Title Priority Date Filing Date
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Country Link
EP (2) EP2199089A1 (en)
SI (1) SI2361186T1 (en)
WO (1) WO2010069930A1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2020101655A1 (en) 2018-11-13 2020-05-22 Hewlett-Packard Development Company, L.P. Convective gas bars
US10940001B2 (en) 2012-05-30 2021-03-09 Neovasc Tiara Inc. Methods and apparatus for loading a prosthesis onto a delivery system

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Publication number Priority date Publication date Assignee Title
US9956788B2 (en) 2015-11-24 2018-05-01 Stitch City Industries Devices and methods for printing on boards

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US4340893A (en) 1980-11-05 1982-07-20 Xerox Corporation Scanning dryer for ink jet printers
US6116728A (en) * 1992-02-26 2000-09-12 Canon Kabushiki Kaisha Ink jet recording method and apparatus and recorded matter
US7052124B2 (en) * 2002-02-28 2006-05-30 Hewlett-Packard Development Company, L.P. Ink assist air knife
BE1014932A3 (en) * 2002-06-20 2004-06-01 Borremans Ghislain Independent dryer system for ink-jet printers, comprises ventilation system for distributing pre-dried air over printed material
US6877852B2 (en) * 2002-07-26 2005-04-12 Hewlett-Packard Development Company, L.P. Ink jet printing systems and related methods
DE10347034B4 (en) 2003-10-09 2006-11-09 J. S. Staedtler Gmbh & Co. Kg Using an ink
WO2007097114A1 (en) * 2006-02-22 2007-08-30 Mutoh Industries Ltd. Inkjet printer
JP4916184B2 (en) * 2006-02-22 2012-04-11 武藤工業株式会社 Printing device
SI1862513T1 (en) * 2006-06-01 2010-11-30 Basler Lacke Ag Ink for printing substrates with a non-porous surface

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10940001B2 (en) 2012-05-30 2021-03-09 Neovasc Tiara Inc. Methods and apparatus for loading a prosthesis onto a delivery system
WO2020101655A1 (en) 2018-11-13 2020-05-22 Hewlett-Packard Development Company, L.P. Convective gas bars
EP3829887A4 (en) * 2018-11-13 2022-04-06 Hewlett-Packard Development Company, L.P. Convective gas bars
US11548303B2 (en) 2018-11-13 2023-01-10 Hewlett-Packard Development Company, L.P. Convective gas bars

Also Published As

Publication number Publication date
EP2361186A1 (en) 2011-08-31
WO2010069930A1 (en) 2010-06-24
EP2199089A1 (en) 2010-06-23
SI2361186T1 (en) 2014-02-28

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