EP4371779A1 - Method for curing uv-curable inkjet ink in a printing machine - Google Patents
Method for curing uv-curable inkjet ink in a printing machine Download PDFInfo
- Publication number
- EP4371779A1 EP4371779A1 EP23206605.0A EP23206605A EP4371779A1 EP 4371779 A1 EP4371779 A1 EP 4371779A1 EP 23206605 A EP23206605 A EP 23206605A EP 4371779 A1 EP4371779 A1 EP 4371779A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light source
- irradiation
- radiation
- inkjet ink
- light
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000007639 printing Methods 0.000 title claims abstract description 26
- 230000005855 radiation Effects 0.000 claims abstract description 37
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 238000007641 inkjet printing Methods 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 7
- 239000000123 paper Substances 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001723 curing Methods 0.000 description 44
- 239000000976 ink Substances 0.000 description 32
- 239000000463 material Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 239000011261 inert gas Substances 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
-
- 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
- B41J11/00—Devices 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
- B41J11/0015—Devices 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
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00214—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using UV radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
-
- 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
- B41J11/00—Devices 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
- B41J11/0015—Devices 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
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00212—Controlling the irradiation means, e.g. image-based controlling of the irradiation zone or control of the duration or intensity of the irradiation
-
- 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
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
- B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
- B41J2/451—Special optical means therefor, e.g. lenses, mirrors, focusing means
Definitions
- the invention relates to a method for curing UV-curable inkjet ink in an inkjet printing machine.
- UV-curable inkjet inks which are to be cured by UV radiation, usually contain one or more UV photoinitiators. After printing on the substrate such as paper, cardboard or film, the UV-curable inkjet inks must be cured, which is sometimes also referred to as drying. This then produces the finished printed product, which no longer rubs off and meets the requirements for commercial use.
- Two-stage curing processes for UV-curable inkjet inks are known in principle from the state of the art.
- Mercury vapor lamps are usually used, but their use is increasingly undesirable from an environmental point of view.
- two-stage curing processes are carried out in such a way that the UV-curable inkjet ink is only partially cured in the first curing step, i.e. only partially cured and thus not fully cured.
- Pre-curing is also known as pinning. Only at the end of the printing process in the inkjet printing machine is the partially cured printed product then finally cured, usually by irradiation with high-intensity UV radiation.
- UV light-emitting diodes UV LEDs
- gas discharge lamps as radiation sources for curing UV-curable inkjet inks in printing machines is also described in principle in the state of the art.
- EP 3 718 777 A1 describes a device for curing UV ink on a printing substrate, whereby UV LED radiation sources are used for curing, the beam angle of which is limited in order to reduce or prevent undesirable matting effects on the printing substrate.
- UV LEDs or flash lamps are used for both initial curing and final curing, whereby the radiation emitted by the UV LEDs or flash lamps is focused more strongly in the case of UV LEDs during initial curing than during final curing and in the case of flash lamps, the radiation emitted is set to be stronger during initial curing than during final curing by means of different electrical control and the irradiation times during initial curing are selected to be shorter than during final curing.
- the method according to the invention enables rapid and complete curing of the UV-curable inkjet ink on the printing material in the printing machine.
- conventional UV light-emitting diodes or flash lamps such as gas discharge lamps can be used as radiation sources, which do not require a large amount of space in the machine.
- UV light-emitting diodes and gas discharge lamps are comparatively inexpensive and generate little waste heat, which does not have to be dissipated through expensive cooling.
- the use of mercury vapor lamps in the printing machine which are increasingly undesirable from an environmental point of view, can be avoided.
- the process according to the invention results in hardened printed products of high quality.
- the present invention relates to a method for curing UV-curable inkjet ink in an inkjet printing machine, in which, in a first step, the UV-curable inkjet ink is irradiated with UV radiation from a first light source and thereby partially cured, and in a second step, the partially cured UV-curable inkjet ink is irradiated with UV radiation from a second light source and thereby finally cured, wherein the UV-curable inkjet ink is irradiated in the first step with UV radiation of an irradiation intensity S 1 and an irradiation duration t 1 and the partially cured UV-curable inkjet ink is irradiated in the second step with UV radiation of an irradiation intensity S 2 and an irradiation duration t 2 , wherein the irradiation intensity S 1 is greater than the irradiation intensity S 2 and the irradiation duration t 1 is shorter than the irradiation duration
- the reactive UV-curable inkjet ink is not yet fully converted. However, further processing within the inkjet printing machine is possible in this state without any disadvantages, particularly for the printed image.
- the final “final curing” process the already pre-cured, still reactive UV-curable inkjet ink is then essentially completely cured and thus reacted, so that after it is discharged from the inkjet printing machine and later used commercially, no disadvantages such as smudging or discoloration occur.
- the first light source and the second light source are arranged spatially separated from one another in the inkjet printing machine.
- the first light source namely at least one flash lamp or, in the alternative embodiment, at least one UV light-emitting diode
- the irradiance S 1 that is applied to the UV-curable medium in the first step of curing is greater than the irradiance S 2 that is applied to the cured UV-curable inkjet ink in the second step of final curing.
- the irradiance describes the incident radiation power per area and is measured in watts per square centimeter.
- the radiation is applied to the printing material in pulsed form, i.e. in the form of short flashes of light.
- the irradiation duration t 1 consists of one irradiation pulse per unit area and the irradiation duration t 2 consists of several irradiation pulses per unit area.
- the irradiation duration t 1 consists of one irradiation pulse per unit area and the irradiation duration t 2 consists of 2 to 10 irradiation pulses per unit area, preferably 2 to 5 irradiation pulses per unit area.
- the unit area always refers to the same area on the printing material, which is initially only partially hardened and then finally hardened.
- the irradiation time t 1 per unit area is composed of an irradiation pulse with a duration in the range from 0.05 to 0.7 milliseconds, preferably from 0.1 to 0.5 milliseconds
- the irradiation time t 2 per unit area is composed of several irradiation pulses with durations in the range from 0.8 to 5 milliseconds per irradiation pulse, preferably from 1 to 3 milliseconds per irradiation pulse.
- the irradiation intensity S 1 per irradiation pulse is in the range from 5 to 30 watts per square centimeter, preferably in the range from 10 to 25 watts per square centimeter, and the irradiation intensity S 2 per irradiation pulse is in the range from 0.5 to 15 watts per square centimeter, preferably in the range from 0.8 to 12 watts per square centimeter.
- S 1 must always be greater than S 2 .
- the irradiation times t 1 and t 2 are set by at least one measure selected from switching on the first light source and/or the second light source for different lengths of time, shielding the radiation of the first light source and/or the second light source for different lengths of time, and combinations thereof.
- the first light source and the second light source are each selected from at least one flash lamp, preferably from gas discharge lamps, especially xenon gas discharge lamps.
- Flash lamps are known in principle to the person skilled in the art. According to the invention, these are preferably gas discharge lamps, particularly preferably xenon gas discharge lamps. Flash lamps such as xenon gas discharge lamps have the advantage that the parameters according to the invention of the different irradiation intensities and irradiation durations can be set particularly easily by selecting the appropriate electrode voltage, the current intensity and the duration of the discharge.
- Flash lamps are used as the first light source and identical flash lamps are used as the second light source. These react in the same way when controlled in the same way.
- the first light source and the second light source are each selected from one or more flash lamps and the different electrical control of the flash lamps is effected by a measure selected from the application of different current intensities, the application of different electrical voltages and combinations thereof.
- the first light source and the second light source are selected from at least one UV light-emitting diode, the radiation of which is optically focused in different ways.
- "Focusing" means bundling the light rays so that the power incident on the printing material per unit area, in other words the irradiance, is increased in contrast to unfocused light rays.
- UV light-emitting diodes which can also be referred to as UV LEDs, are known in principle to those skilled in the art. Such light-emitting diodes emit a particularly high proportion of UV radiation and are commercially available, for example from Seoul Semiconductor Co., Ltd., Ansan, South Korea.
- the first light source and the second light source are each selected from one or more UV light-emitting diodes and the radiation from the first light source and the radiation from the second light source are each focused using one or more optical lenses.
- the irradiance of the UV radiation in the second step i.e. the final curing, is then lower than in the first step, i.e. the initial curing, despite the focusing.
- the first light source and the second light source are each selected from one or more UV light-emitting diodes, wherein the radiation of the first light source is focused by means of one or more optical lenses and the radiation of the second light source is not focused.
- the wavelength spectrum of the at least one UV light-emitting diode in the first step is essentially identical to the wavelength spectrum of the at least one UV light-emitting diode in the second step, namely the final curing.
- the same UV light-emitting diodes are used in the first step and in the second step. These react in the same way when controlled in the same way.
- UV-curable inkjet inks are cured.
- all UV inkjet inks that can be printed in inkjet printing machines can be used as UV-curable inkjet inks.
- UV-curable inkjet inks are known in principle to those skilled in the art and generally comprise one or more UV photoinitiators, which are converted into a reactive state by irradiation with UV light, which initiates the curing reaction, usually via a radical reaction mechanism.
- the UV-curable inkjet ink that is cured in the method according to the invention comprises, in a preferred embodiment, one or more UV photoinitiators.
- the method according to the invention is carried out in an inkjet printing machine.
- the inkjet printing machine comprises at least one inkjet print head for printing the UV-curable inkjet ink.
- the UV-curable inkjet ink is on a printing substrate, which is preferably selected from paper, cardboard and film.
- the UV-curable inkjet ink is printed onto one of the above-mentioned printing substrates, preferably using one or more inkjet print heads.
- the process according to the invention does not generally need to be carried out in the presence of an inert gas such as nitrogen or noble gas, although this is possible If curing is carried out in the presence of an inert gas, it is preferable to carry out only the second step of the final curing in the presence of the inert gas.
- an inert gas such as nitrogen or noble gas
- Figure 1 shows schematically the method according to the invention using a preferred example.
- the UV inkjet ink printed on a printing material (5) for example a sheet of paper
- a printing material (5) for example a sheet of paper
- the printed printing material (5) with the hardened UV inkjet ink is then conveyed further through the inkjet printing machine (2), optionally printed with other colors (not shown) and finally conveyed to a UV light-emitting diode as the second light source (4) for final hardening.
- the finished printed product is discharged from the inkjet printing machine (2).
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Ink Jet (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zum Härten von UV-Inkjettinte in einer Druckmaschine, bei dem man in einem ersten Schritt die UV-Inkjettinte mit UV-Strahlung hoher Bestrahlungsstärke und kurzer Bestrahlungsdauer bestrahlt und dadurch anhärtet und in einem zweiten Schritt die angehärtete UV-Inkjettinte mit UV-Strahlung niedrigerer Bestrahlungsstärke und längerer Bestrahlungsdauer bestrahlt und dadurch endhärtet. Als Lichtquellen werden UV-Leuchtdioden oder Blitzlampen verwendet werden, deren Bestrahlungsstärken man durch optische Fokussierung oder unterschiedliche elektrische Ansteuerung verändert. Durch dieses Verfahren erhält man gehärtete Druckerzeugnisse hoher Qualität.The invention relates to a method for curing UV inkjet ink in a printing machine, in which, in a first step, the UV inkjet ink is irradiated with UV radiation of high irradiance and short irradiation time, thereby hardening, and in a second step, the hardened UV inkjet ink is irradiated with UV radiation of lower irradiance and longer irradiation time, thereby final curing. UV light-emitting diodes or flash lamps are used as light sources, the irradiance of which is changed by optical focusing or different electrical control. This method produces hardened printed products of high quality.
Description
Die Erfindung betrifft ein Verfahren zum Härten von UV-härtbarer Inkjettinte in einer Inkj etdruckmaschine.The invention relates to a method for curing UV-curable inkjet ink in an inkjet printing machine.
In der Druckindustrie sind zahlreiche Druckverfahren mit UV-härtbaren Druckmedien wie UV-Inkjettinten und UV-Lacken bekannt. UV-härtbare Inkjettinten, die durch UV-Strahlung gehärtet werden sollen, umfassen in der Regel einen oder mehrere UV-Photoinitiatoren. Nach dem Aufdrucken auf den Bedruckstoff wie Papier, Karton oder Folie müssen die UV-härtbaren Inkjettinten gehärtet werden, was manchmal auch als Trocknung bezeichnet wird. Anschließend erhält man das fertige Druckerzeugnis, das nicht mehr abfärbt und den Anforderungen an eine kommerzielle Verwendung gerecht wird.In the printing industry, numerous printing processes with UV-curable printing media such as UV inkjet inks and UV varnishes are known. UV-curable inkjet inks, which are to be cured by UV radiation, usually contain one or more UV photoinitiators. After printing on the substrate such as paper, cardboard or film, the UV-curable inkjet inks must be cured, which is sometimes also referred to as drying. This then produces the finished printed product, which no longer rubs off and meets the requirements for commercial use.
Aus dem Stand der Technik sind zweistufige Härtungsverfahren für UV-härtbare Inkjettinten prinzipiell bekannt. Dabei werden üblicherweise Quecksilberdampflampen eingesetzt, deren Verwendung jedoch aus Umweltgesichtspunkten zunehmend unerwünscht ist. In der Regel wird in zweistufigen Härtungsverfahren so vorgegangen, dass man die UV-härtbare Inkjettinte im ersten Härtungsschritt nur anhärtet, also nur teilweise härtet und somit noch nicht vollständig durchhärtet. Das Anhärten wird auch als Pinnen bezeichnet. Erst am Ende des Druckvorgangs in der Inkjetdruckmaschine wird das angehärtete Druckerzeugnis dann endgehärtet, meist durch Bestrahlung mit UV-Strahlung von hoher Intensität. Prinzipiell im Stand der Technik beschrieben ist auch die Verwendung von UV-Leuchtdioden (UV-LEDs) oder Gasentladungslampen als Strahlungsquellen zum Härten von UV-härtbaren Inkjettinten in Druckmaschinen.Two-stage curing processes for UV-curable inkjet inks are known in principle from the state of the art. Mercury vapor lamps are usually used, but their use is increasingly undesirable from an environmental point of view. As a rule, two-stage curing processes are carried out in such a way that the UV-curable inkjet ink is only partially cured in the first curing step, i.e. only partially cured and thus not fully cured. Pre-curing is also known as pinning. Only at the end of the printing process in the inkjet printing machine is the partially cured printed product then finally cured, usually by irradiation with high-intensity UV radiation. The use of UV light-emitting diodes (UV LEDs) or gas discharge lamps as radiation sources for curing UV-curable inkjet inks in printing machines is also described in principle in the state of the art.
Die im Stand der Technik beschriebenen Verfahren zur Härtung von UV-härtbaren Inkjettinten in Inkjetdruckmaschinen sind jedoch für manche Anwendungsfälle nicht zufriedenstellend. So ist bei hohen Druckgeschwindigkeiten und somit einem hohen Durchsatz an Bedruckstoffen eine besonders kurze Härtungszeit erforderlich, welche mit herkömmlichen Härtungsmethoden nicht oder nur technisch aufwendig erreichbar ist. Insbesondere bei Low-Migration-Inkjettinten, die hoch reaktiv sind und sehr schnell aushärten, sind die Härtungsverfahren des Standes der Technik bisher apparativ sehr aufwendig. Eine zufriedenstellende Härtung von Low-Migration-Inkjettinten mittels UV-Leuchtdioden ist bisher nicht beschrieben worden.However, the methods described in the prior art for curing UV-curable inkjet inks in inkjet printing machines are not suitable for some applications. satisfactory. For example, at high printing speeds and thus a high throughput of printing materials, a particularly short curing time is required, which cannot be achieved with conventional curing methods or can only be achieved with great technical effort. In particular with low-migration inkjet inks, which are highly reactive and cure very quickly, the state-of-the-art curing processes have so far been very complex in terms of equipment. Satisfactory curing of low-migration inkjet inks using UV light-emitting diodes has not yet been described.
Überraschenderweise wurde nun gefunden, dass eine besonders einfache und effektive Härtung von UV-härtbaren Inkjettinten in zweistufigen Härtungsverfahren mit Anhärten und Endhärten möglich ist, wenn man sowohl zum Anhärten als auch zum Endhärten entweder UV-Leuchtdioden oder Blitzlampen verwendet, wobei man die von den UV-Leuchtdioden oder Blitzlampen abgegebene Strahlung im Fall der UV-Leuchtdioden beim Anhärten stärker fokussiert als beim Endhärten und im Fall der Blitzlampen durch unterschiedliche elektrische Ansteuerung die abgegebene Strahlung beim Anhärten stärker einstellt als beim Endhärten und die Bestrahlungsdauern beim Anhärten jeweils kürzer wählt als beim Endhärten. Dementsprechend wird beim Anhärten eine größere Bestrahlungsstärke und eine kürzere Bestrahlungsdauer angewendet, beim Endhärten eine geringere Bestrahlungsstärke und eine längere Bestrahlungsdauer. Diese Ergebnisse sind überraschend, weil man ausgehend von den Erfahrungen mit Quecksilberdampflampen eigentlich davon ausgehen sollte, dass die stärkere Fokussierung der UV-Strahlung und die damit verbundene höhere Bestrahlungsstärke der UV-Strahlung beim Endhärten im Gegensatz zum Anhärten angewendet werden sollte. Es wurde jedoch festgestellt, dass die Anwendung der im ersten Schritt des Anhärtens verwendeten hohen Bestrahlungsstärke bei einer längeren Einwirkzeit wie im zweiten Schritt des Endhärtens in der Regel zu einer Beschädigung der UV-härtbaren Inkjettinte und des Bedruckstoffes führt.Surprisingly, it has now been found that a particularly simple and effective curing of UV-curable inkjet inks is possible in two-stage curing processes with initial curing and final curing if either UV LEDs or flash lamps are used for both initial curing and final curing, whereby the radiation emitted by the UV LEDs or flash lamps is focused more strongly in the case of UV LEDs during initial curing than during final curing and in the case of flash lamps, the radiation emitted is set to be stronger during initial curing than during final curing by means of different electrical control and the irradiation times during initial curing are selected to be shorter than during final curing. Accordingly, a higher irradiance and a shorter irradiation time are used during initial curing, and a lower irradiance and a longer irradiation time are used during final curing. These results are surprising because, based on experience with mercury vapor lamps, one would actually assume that the stronger focus of UV radiation and the associated higher irradiance of UV radiation should be used in the final curing step as opposed to the initial curing step. However, it was found that the application of the high irradiance used in the first step of initial curing with a longer exposure time as in the second step of final curing generally leads to damage to the UV-curable inkjet ink and the substrate.
Mit dem erfindungsgemäßen Verfahren ist eine rasche und vollständige Härtung der UV-härtbaren Inkjettinte auf dem Bedruckstoff in der Druckmaschine möglich. Es können je nach Ausführungsform herkömmliche UV-Leuchtdioden oder Blitzlampen wie Gasentladungslampen als Strahlungsquellen verwendet werden, für die kein großer Platzbedarf in der Maschine erforderlich ist. UV-Leuchtdioden und Gasentladungslampen sind vergleichsweise kostengünstig und erzeugen wenig Abwärme, welche nicht aufwendig durch Kühlung abgeführt werden muss. Außerdem kann man den Einsatz von aus Umweltgesichtspunkten zunehmend unerwünschten Quecksilberdampflampen in der Druckmaschine vermeiden. Als Ergebnis des erfindungsgemäßen Verfahrens erhält man gehärtete Druckerzeugnisse von hoher Qualität.The method according to the invention enables rapid and complete curing of the UV-curable inkjet ink on the printing material in the printing machine. Depending on the design, conventional UV light-emitting diodes or flash lamps such as gas discharge lamps can be used as radiation sources, which do not require a large amount of space in the machine. UV light-emitting diodes and gas discharge lamps are comparatively inexpensive and generate little waste heat, which does not have to be dissipated through expensive cooling. In addition, the use of mercury vapor lamps in the printing machine, which are increasingly undesirable from an environmental point of view, can be avoided. The process according to the invention results in hardened printed products of high quality.
Durch die Verwendung baugleicher Blitzlampen oder baugleicher UV-Leuchtdioden, die nur unterschiedlich elektrisch angesteuert beziehungsweise unterschiedlich optisch fokussiert werden müssen, ist eine vergleichsweise einfacher Austauschbarkeit, Reparierbarkeit und auch Steuerbarkeit innerhalb der Inkjetdruckmaschine gegeben. Es brauchen prinzipiell keine unterschiedlichen Steuergeräte für die Blitzlampen eingebaut zu werden, was Platz und Wartungsaufwand spart. Das gleiche gilt sinngemäß bei der Verwendung baugleicher UV-Leuchtdioden.By using identical flash lamps or identical UV LEDs, which only need to be electrically controlled or optically focused differently, it is relatively easy to replace, repair and control them within the inkjet printing machine. In principle, no different control units need to be installed for the flash lamps, which saves space and maintenance effort. The same applies when using identical UV LEDs.
Dementsprechend betrifft die vorliegende Erfindung ein Verfahren zum Härten von UV-härtbarer Inkjettinte in einer Inkjetdruckmaschine, bei dem man in einem ersten Schritt die UV-härtbare Inkjettinte mit UV-Strahlung einer ersten Lichtquelle bestrahlt und dadurch anhärtet und in einem zweiten Schritt die angehärtete UV-härtbare Inkjettinte mit UV-Strahlung einer zweiten Lichtquelle bestrahlt und dadurch endhärtet, wobei man die UV-härtbare Inkjettinte im ersten Schritt mit UV-Strahlung einer Bestrahlungsstärke S1 und einer Bestrahlungsdauer t1 bestrahlt und die angehärtete UV-härtbare Inkjettinte im zweiten Schritt mit UV-Strahlung einer Bestrahlungsstärke S2 und einer Bestrahlungsdauer t2 bestrahlt, wobei die Bestrahlungsstärke S1 größer ist als die Bestrahlungsstärke S2 und die Bestrahlungsdauer t1 kürzer ist als die Bestrahlungsdauer t2, wobei es sich bei der ersten Lichtquelle und der zweiten Lichtquelle um baugleiche Vorrichtungen handelt, die ausgewählt sind unter einer oder mehreren Blitzlampen und einer oder mehreren UV-Leuchtdioden, wobei man in dem Fall, dass es sich um Blitzlampen handelt, die Bestrahlungsstärken S1 und S2 über eine unterschiedliche elektrische Ansteuerung der Blitzlampen der ersten Lichtquelle und der zweiten Lichtquelle einstellt und man in dem Fall, dass es sich um UV-Leuchtdioden handelt, die Bestrahlungsstärken S1 und S2 über eine unterschiedliche optische Fokussierung der Strahlung der UV-Leuchtdioden der ersten Lichtquelle und der zweiten Lichtquelle einstellt.Accordingly, the present invention relates to a method for curing UV-curable inkjet ink in an inkjet printing machine, in which, in a first step, the UV-curable inkjet ink is irradiated with UV radiation from a first light source and thereby partially cured, and in a second step, the partially cured UV-curable inkjet ink is irradiated with UV radiation from a second light source and thereby finally cured, wherein the UV-curable inkjet ink is irradiated in the first step with UV radiation of an irradiation intensity S 1 and an irradiation duration t 1 and the partially cured UV-curable inkjet ink is irradiated in the second step with UV radiation of an irradiation intensity S 2 and an irradiation duration t 2 , wherein the irradiation intensity S 1 is greater than the irradiation intensity S 2 and the irradiation duration t 1 is shorter than the irradiation duration t 2 , wherein the first light source and the second light source are structurally identical devices selected from one or more flash lamps and one or more UV light-emitting diodes, wherein in the case of flash lamps, the irradiances S 1 and S 2 are set via a different electrical control of the flash lamps of the first light source and the second light source, and in the case of UV light-emitting diodes, the irradiances S 1 and S 2 are set via a different optical focusing of the radiation of the UV light-emitting diodes of the first light source and the second light source.
Beim "Anhärten" wird dabei die reaktive UV-härtbare Inkjettinte noch nicht vollständig umgesetzt. Eine Weiterverarbeitung innerhalb der Inkjetdruckmaschine ist jedoch in diesem Zustand bereits ohne Nachteile insbesondere für das Druckbild möglich. Beim abschließenden "Endhärten" wird die bereits angehärtete, immer noch reaktive UV-härtbare Inkjettinte dann im Wesentlichen vollständig durchgehärtet und damit abreagiert, so dass nach dem Ausschleusen aus der Inkjetdruckmaschine und der späteren kommerziellen Verwendung keine Nachteile wie Verschmieren oder Abfärben auftreten.During the "pre-curing" process, the reactive UV-curable inkjet ink is not yet fully converted. However, further processing within the inkjet printing machine is possible in this state without any disadvantages, particularly for the printed image. During the final "final curing" process, the already pre-cured, still reactive UV-curable inkjet ink is then essentially completely cured and thus reacted, so that after it is discharged from the inkjet printing machine and later used commercially, no disadvantages such as smudging or discoloration occur.
In einer bevorzugten Ausführungsform sind die erste Lichtquelle und die zweite Lichtquelle räumlich voneinander getrennt in der Inkjetdruckmaschine angeordnet. Die erste Lichtquelle, nämlich wenigstens eine Blitzlampe oder in der alternativen Ausführungsform wenigstens eine UV-Leuchtdiode, ist somit an einem anderen Ort lokalisiert als die zweite Lichtquelle, nämlich wenigstens eine Blitzlampe oder in der alternativen Ausführungsform wenigstens eine UV-Leuchtdiode.In a preferred embodiment, the first light source and the second light source are arranged spatially separated from one another in the inkjet printing machine. The first light source, namely at least one flash lamp or, in the alternative embodiment, at least one UV light-emitting diode, is thus located at a different location than the second light source, namely at least one flash lamp or, in the alternative embodiment, at least one UV light-emitting diode.
Erfindungsgemäß ist die Bestrahlungsstärke S1, die im ersten Schritt des Anhärtens auf das UV-härtbare Medium angewendet wird, größer als die Bestrahlungsstärke S2, die im zweiten Schritt des Endhärtens auf die angehärtete UV-härtbare Inkjettinte angewendet wird. Die Bestrahlungsstärke beschreibt die auftreffende Strahlungsleistung pro Fläche und wird in Watt pro Quadratzentimeter gemessen.According to the invention, the irradiance S 1 that is applied to the UV-curable medium in the first step of curing is greater than the irradiance S 2 that is applied to the cured UV-curable inkjet ink in the second step of final curing. The irradiance describes the incident radiation power per area and is measured in watts per square centimeter.
In einer bevorzugten Ausführungsform wird die Strahlung gepulst, also in Form von kurzen Lichtblitzen, auf den Bedruckstoff aufgebracht. In einer besonders bevorzugten Ausführungsform setzt sich die Bestrahlungsdauer t1 aus einem Bestrahlungspuls pro Flächeneinheit und die Bestrahlungsdauer t2 aus mehreren Bestrahlungspulsen pro Flächeneinheit zusammen. In einer ganz besonders bevorzugten Ausführungsform setzt sich die Bestrahlungsdauer t1 aus einem Bestrahlungspuls pro Flächeneinheit und die Bestrahlungsdauer t2 aus 2 bis 10 Bestrahlungspulsen pro Flächeneinheit, bevorzugt aus 2 bis 5 Bestrahlungspulsen pro Flächeneinheit, zusammen. Als Flächeneinheit ist dabei stets die gleiche Fläche auf dem Bedruckstoff gemeint, welche zunächst nur angehärtet und anschließend endgehärtet wird.In a preferred embodiment, the radiation is applied to the printing material in pulsed form, i.e. in the form of short flashes of light. In a particularly preferred embodiment, the irradiation duration t 1 consists of one irradiation pulse per unit area and the irradiation duration t 2 consists of several irradiation pulses per unit area. In a particularly preferred embodiment, the irradiation duration t 1 consists of one irradiation pulse per unit area and the irradiation duration t 2 consists of 2 to 10 irradiation pulses per unit area, preferably 2 to 5 irradiation pulses per unit area. The unit area always refers to the same area on the printing material, which is initially only partially hardened and then finally hardened.
In einer weiteren bevorzugten Ausführungsform setzt sich die Bestrahlungdauer t1 pro Flächeneinheit aus einem Bestrahlungspuls mit einer Dauer im Bereich von 0,05 bis 0,7 Millisekunden, bevorzugt von 0,1 bis 0,5 Millisekunden, zusammen und die Bestrahlungsdauer t2 pro Flächeneinheit aus mehreren Bestrahlungspulsen mit Dauern im Bereich von 0,8 bis 5 Millisekunden pro Bestrahlungspuls, bevorzugt von 1 bis 3 Millisekunden pro Bestrahlungspuls, zusammen.In a further preferred embodiment, the irradiation time t 1 per unit area is composed of an irradiation pulse with a duration in the range from 0.05 to 0.7 milliseconds, preferably from 0.1 to 0.5 milliseconds, and the irradiation time t 2 per unit area is composed of several irradiation pulses with durations in the range from 0.8 to 5 milliseconds per irradiation pulse, preferably from 1 to 3 milliseconds per irradiation pulse.
In einer weiteren bevorzugten Ausführungsform liegt die Bestrahlungsstärke S1 pro Bestrahlungspuls im Bereich von 5 bis 30 Watt pro Quadratzentimeter, bevorzugt im Bereich von 10 bis 25 Watt pro Quadratzentimeter, und die Bestrahlungsstärke S2 pro Bestrahlungspuls im Bereich von 0,5 bis 15 Watt pro Quadratzentimeter, bevorzugt im Bereich von 0,8 bis 12 Watt pro Quadratzentimeter. Bei der Auswahl der Bestrahlungsstärken ist zu berücksichtigen, dass erfindungsgemäß immer S1 größer als S2 sein muss.In a further preferred embodiment, the irradiation intensity S 1 per irradiation pulse is in the range from 5 to 30 watts per square centimeter, preferably in the range from 10 to 25 watts per square centimeter, and the irradiation intensity S 2 per irradiation pulse is in the range from 0.5 to 15 watts per square centimeter, preferably in the range from 0.8 to 12 watts per square centimeter. When selecting the irradiation intensities, it must be taken into account that according to the invention S 1 must always be greater than S 2 .
In einer bevorzugten Ausführungsform stellt man die Bestrahlungsdauern t1 und t2 durch wenigstens eine Maßnahme ein, die ausgewählt ist unter unterschiedlich langem Einschalten der ersten Lichtquelle und/oder der zweiten Lichtquelle, unterschiedlich langem Abschirmen der Strahlung der ersten Lichtquelle und/oder der zweiten Lichtquelle und Kombinationen davon.In a preferred embodiment, the irradiation times t 1 and t 2 are set by at least one measure selected from switching on the first light source and/or the second light source for different lengths of time, shielding the radiation of the first light source and/or the second light source for different lengths of time, and combinations thereof.
In einer Ausführungsform der Erfindung sind die erste Lichtquelle und die zweite Lichtquelle jeweils ausgewählt unter wenigstens einer Blitzlampe, bevorzugt unter Gasentladungslampen, speziell Xenon-Gasentladungslampen. Blitzlampen sind dem Fachmann prinzipiell bekannt. Hierbei handelt es sich erfindungsgemäß bevorzugt um Gasentladungslampen, besonders bevorzugt um Xenon-Gasentladungslampen. Blitzlampen wie Xenon-Gasentladungslampen haben den Vorteil, dass über die geeignete Wahl der Elektrodenspannung, der Stromstärke und der Dauer der Entladung die erfindungsgemäßen Parameter der unterschiedlichen Bestrahlungsstärken und Bestrahlungsdauern besonders einfach eingestellt werden können. Erfindungsgemäß werden in der Ausführungsform mit Blitzlampen als erste Lichtquelle und als zweite Lichtquelle baugleiche Blitzlampen verwendet. Diese reagieren entsprechend bei gleicher Ansteuerung auf gleiche Weise.In one embodiment of the invention, the first light source and the second light source are each selected from at least one flash lamp, preferably from gas discharge lamps, especially xenon gas discharge lamps. Flash lamps are known in principle to the person skilled in the art. According to the invention, these are preferably gas discharge lamps, particularly preferably xenon gas discharge lamps. Flash lamps such as xenon gas discharge lamps have the advantage that the parameters according to the invention of the different irradiation intensities and irradiation durations can be set particularly easily by selecting the appropriate electrode voltage, the current intensity and the duration of the discharge. According to the invention, in the embodiment with Flash lamps are used as the first light source and identical flash lamps are used as the second light source. These react in the same way when controlled in the same way.
In einer bevorzugten Ausführungsform sind die erste Lichtquelle und die zweite Lichtquelle jeweils ausgewählt unter einer oder mehreren Blitzlampen und man bewirkt die unterschiedliche elektrische Ansteuerung der Blitzlampen durch eine Maßnahme, die ausgewählt ist unter dem Anlegen unterschiedlicher Stromstärken, dem Anlegen unterschiedlicher elektrischer Spannungen und Kombinationen davon.In a preferred embodiment, the first light source and the second light source are each selected from one or more flash lamps and the different electrical control of the flash lamps is effected by a measure selected from the application of different current intensities, the application of different electrical voltages and combinations thereof.
In einer weiteren Ausführungsform der Erfindung sind die erste Lichtquelle und die zweite Lichtquelle ausgewählt unter wenigstens einer UV-Leuchtdiode, deren Strahlung man unterschiedlich optisch fokussiert. Damit lässt sich die emittierte UV-Strahlung der Leuchtdiode gebündelt auf den Bedruckstoff anwenden. Unter "fokussieren" wird eine Bündelung der Lichtstrahlen verstanden, so dass die pro Flächeneinheit auf dem Bedruckstoff auftreffende Leistung, mit anderen Worten die Bestrahlungsstärke, im Gegensatz zu nicht fokussierten Lichtstrahlen erhöht wird. UV-Leuchtdioden, die man auch als UV-LEDs bezeichnen kann, sind den Fachmann prinzipiell bekannt. Solche Leuchtdioden emittieren einen besonders hohen Anteil an UV-Strahlung und sind kommerziell erhältlich, beispielsweise von der Fa. Seoul Semiconductor Co., Ltd., Ansan, Südkorea.In a further embodiment of the invention, the first light source and the second light source are selected from at least one UV light-emitting diode, the radiation of which is optically focused in different ways. This allows the UV radiation emitted by the light-emitting diode to be applied to the printing material in a bundled manner. "Focusing" means bundling the light rays so that the power incident on the printing material per unit area, in other words the irradiance, is increased in contrast to unfocused light rays. UV light-emitting diodes, which can also be referred to as UV LEDs, are known in principle to those skilled in the art. Such light-emitting diodes emit a particularly high proportion of UV radiation and are commercially available, for example from Seoul Semiconductor Co., Ltd., Ansan, South Korea.
In einer bevorzugten Ausführungsform sind die erste Lichtquelle und die zweite Lichtquelle jeweils ausgewählt unter einer oder mehreren UV-Leuchtdioden und man fokussiert die Strahlung der ersten Lichtquelle und die Strahlung der zweiten Lichtquelle jeweils mittels einer oder mehrerer optischer Linsen. In dieser bevorzugten Ausführungsform ist die Bestrahlungsstärke der UV-Strahlung dann im zweiten Schritt, also der Endhärtung, trotz der Fokussierung geringer als im ersten Schritt, also der Anhärtung.In a preferred embodiment, the first light source and the second light source are each selected from one or more UV light-emitting diodes and the radiation from the first light source and the radiation from the second light source are each focused using one or more optical lenses. In this preferred embodiment, the irradiance of the UV radiation in the second step, i.e. the final curing, is then lower than in the first step, i.e. the initial curing, despite the focusing.
In einer weiteren bevorzugten Ausführungsform sind die erste Lichtquelle und die zweite Lichtquelle jeweils ausgewählt unter einer oder mehreren UV-Leuchtdioden, wobei man die Strahlung der ersten Lichtquelle mittels einer oder mehrerer optischer Linsen fokussiert und die Strahlung der zweiten Lichtquelle nicht fokussiert.In a further preferred embodiment, the first light source and the second light source are each selected from one or more UV light-emitting diodes, wherein the radiation of the first light source is focused by means of one or more optical lenses and the radiation of the second light source is not focused.
In einer weiteren bevorzugten Ausführungsform ist bei der Verwendung von UV-Leuchtdioden das Wellenlängenspektrum der wenigstens einen UV-Leuchtdiode im ersten Schritt, nämlich der Anhärtung, im Wesentlichen identisch mit dem Wellenlängenspektrum der wenigstens einen UV-Leuchtdiode im zweiten Schritt, nämlich der Endhärtung. Erfindungsgemäß nutzt man in der Ausführungsform, die UV-Leuchtdioden verwendet, im ersten Schritt und im zweiten Schritt jeweils die baugleichen UV-Leuchtdioden. Diese reagieren entsprechend bei gleicher Ansteuerung auf gleiche Weise.In a further preferred embodiment, when using UV light-emitting diodes, the wavelength spectrum of the at least one UV light-emitting diode in the first step, namely the initial curing, is essentially identical to the wavelength spectrum of the at least one UV light-emitting diode in the second step, namely the final curing. According to the invention, in the embodiment that uses UV light-emitting diodes, the same UV light-emitting diodes are used in the first step and in the second step. These react in the same way when controlled in the same way.
In dem erfindungsgemäßen Verfahren wird UV-härtbare Inkjettinten gehärtet. Als UV-härtbare Inkjettinten können prinzipiell alle in Inkjetdruckmaschinen verdruckbaren UV-Inkjettinten zum Einsatz kommen. UV-härtbaren Inkjettinten sind dem Fachmann prinzipiell bekannt und umfassen in der Regel einen oder mehrere UV-Photoinitiatoren, welche durch Bestrahlung mit UV-Licht in einen reaktiven Zustand überführt werden, der die Härtungsreaktion, meist über einen radikalischen Reaktionsmechanismus, einleitet. Dementsprechend umfasst die UV-härtbare Inkjettinte, die in dem erfindungsgemäßen Verfahren gehärtet wird, in einer bevorzugten Ausführungsform einen oder mehrere UV-Photoinitiatoren..In the method according to the invention, UV-curable inkjet inks are cured. In principle, all UV inkjet inks that can be printed in inkjet printing machines can be used as UV-curable inkjet inks. UV-curable inkjet inks are known in principle to those skilled in the art and generally comprise one or more UV photoinitiators, which are converted into a reactive state by irradiation with UV light, which initiates the curing reaction, usually via a radical reaction mechanism. Accordingly, the UV-curable inkjet ink that is cured in the method according to the invention comprises, in a preferred embodiment, one or more UV photoinitiators.
Das erfindungsgemäße Verfahren wird in einer Inkj etdruckmaschine ausgeführt. In einer bevorzugten Ausführungsform umfasst die Inkjetdruckmaschine wenigstens einen Inkj etdruckkopf zum Aufdrucken der UV-härtbaren Inkj ettinte.The method according to the invention is carried out in an inkjet printing machine. In a preferred embodiment, the inkjet printing machine comprises at least one inkjet print head for printing the UV-curable inkjet ink.
In einer bevorzugten Ausführungsform befindet sich die UV-härtbare Inkjettinte auf einem Bedruckstoff, der bevorzugt ausgewählt ist unter Papier, Karton und Folie. Dabei wurde die UV-härtbare Inkjettinte auf einen der genannten Bedruckstoffe bevorzugt mittels eines oder mehrerer Inkj etdruckköpfe aufgedruckt.In a preferred embodiment, the UV-curable inkjet ink is on a printing substrate, which is preferably selected from paper, cardboard and film. The UV-curable inkjet ink is printed onto one of the above-mentioned printing substrates, preferably using one or more inkjet print heads.
Das erfindungsgemäße Verfahren braucht in der Regel nicht in der Gegenwart eines Inertgases wie Stickstoff oder Edelgas durchgeführt zu werden, wenngleich dieses möglich ist. Wird in Gegenwart eines Inertgases gehärtet, so wird bevorzugt nur der zweite Schritt der Endhärtung in Gegenwart des Inertgases durchgeführt.The process according to the invention does not generally need to be carried out in the presence of an inert gas such as nitrogen or noble gas, although this is possible If curing is carried out in the presence of an inert gas, it is preferable to carry out only the second step of the final curing in the presence of the inert gas.
- 22
- InkjetdruckmaschineInkjet printing machine
- 33
- erste Lichtquellefirst light source
- 44
- zweite Lichtquellesecond light source
- 55
- BedruckstoffPrinting material
Claims (15)
dadurch gekennzeichnet,
dass die Bestrahlungsstärke S1 größer ist als die Bestrahlungsstärke S2 und die Bestrahlungsdauer t1 kürzer ist als die Bestrahlungsdauer t2, wobei es sich bei der ersten Lichtquelle (3) und der zweiten Lichtquelle (4) um baugleiche Vorrichtungen handelt, die ausgewählt sind unter einer oder mehreren Blitzlampen und einer oder mehreren UV-Leuchtdioden, wobei man in dem Fall, dass es sich um Blitzlampen handelt, die Bestrahlungsstärken S1 und S2 über eine unterschiedliche elektrische Ansteuerung der Blitzlampen der ersten Lichtquelle (3) und der zweiten Lichtquelle (4) einstellt und man in dem Fall, dass es sich um UV-Leuchtdioden handelt, die Bestrahlungsstärken S1 und S2 über eine unterschiedliche optische Fokussierung der Strahlung der UV-Leuchtdioden der ersten Lichtquelle (3) und der zweiten Lichtquelle (4) einstellt.Method for curing UV-curable inkjet ink (1) in an inkjet printing machine (2), in which in a first step the UV-curable inkjet ink (1) is irradiated with UV radiation from a first light source (3) and thereby partially cured and in a second step the partially cured UV-curable inkjet ink (1) is irradiated with UV radiation from a second light source (4) and thereby finally cured, wherein the UV-curable inkjet ink (1) is irradiated in the first step with UV radiation of an irradiation intensity S 1 and an irradiation duration t 1 and the partially cured UV-curable inkjet ink (1) is irradiated in the second step with UV radiation of an irradiation intensity S 2 and an irradiation duration t 2 ,
characterized,
that the irradiation intensity S 1 is greater than the irradiation intensity S 2 and the irradiation duration t 1 is shorter than the irradiation duration t 2 , wherein the first light source (3) and the second light source (4) are identical devices selected from one or more flash lamps and one or more UV light-emitting diodes, wherein in the case of flash lamps, the irradiation intensities S 1 and S 2 are set via a different electrical control of the flash lamps of the first light source (3) and the second light source (4), and in the case of UV light-emitting diodes, the irradiation intensities S 1 and S 2 are set via a different optical focusing of the radiation of the UV light-emitting diodes of the first light source (3) and the second light source (4).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP22208481.6A EP4371778A1 (en) | 2022-11-21 | 2022-11-21 | Method for hardening a uv-curable medium in a printing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4371779A1 true EP4371779A1 (en) | 2024-05-22 |
Family
ID=84360791
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22208481.6A Pending EP4371778A1 (en) | 2022-11-21 | 2022-11-21 | Method for hardening a uv-curable medium in a printing machine |
| EP23206605.0A Pending EP4371779A1 (en) | 2022-11-21 | 2023-10-30 | Method for curing uv-curable inkjet ink in a printing machine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22208481.6A Pending EP4371778A1 (en) | 2022-11-21 | 2022-11-21 | Method for hardening a uv-curable medium in a printing machine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20240165967A1 (en) |
| EP (2) | EP4371778A1 (en) |
| CN (1) | CN118056683A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010274584A (en) * | 2009-05-29 | 2010-12-09 | Afit Corp | Image forming method by inkjet |
| JP2014024264A (en) * | 2012-07-27 | 2014-02-06 | Kyocera Corp | Light irradiation unit and printer |
| JP2014076639A (en) * | 2012-09-24 | 2014-05-01 | Mimaki Engineering Co Ltd | Printing method and printer |
| JP2017043079A (en) * | 2015-08-29 | 2017-03-02 | 京セラ株式会社 | Printing method |
| KR20180075049A (en) * | 2016-12-26 | 2018-07-04 | 김동철 | Foil printing method using uv ink printer |
| US20200070555A1 (en) * | 2017-05-22 | 2020-03-05 | Xeikon Manufacturing N.V. | Method for curing of an ink or toner layer and printing system with curing unit |
| EP3718777A1 (en) | 2019-04-02 | 2020-10-07 | Heidelberger Druckmaschinen AG | Device for hardening uv ink on a printing substrate |
| WO2022135000A1 (en) * | 2020-12-22 | 2022-06-30 | 3M Innovative Properties Company | Electronic telecommunications articles comprising crosslinked fluoropolymer and fluoropolymer particles, compositions and methods |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6127380B2 (en) * | 2012-04-27 | 2017-05-17 | セイコーエプソン株式会社 | Printing apparatus and printing method |
-
2022
- 2022-11-21 EP EP22208481.6A patent/EP4371778A1/en active Pending
-
2023
- 2023-10-30 EP EP23206605.0A patent/EP4371779A1/en active Pending
- 2023-11-21 CN CN202311552578.3A patent/CN118056683A/en active Pending
- 2023-11-21 US US18/515,579 patent/US20240165967A1/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010274584A (en) * | 2009-05-29 | 2010-12-09 | Afit Corp | Image forming method by inkjet |
| JP2014024264A (en) * | 2012-07-27 | 2014-02-06 | Kyocera Corp | Light irradiation unit and printer |
| JP2014076639A (en) * | 2012-09-24 | 2014-05-01 | Mimaki Engineering Co Ltd | Printing method and printer |
| JP2017043079A (en) * | 2015-08-29 | 2017-03-02 | 京セラ株式会社 | Printing method |
| KR20180075049A (en) * | 2016-12-26 | 2018-07-04 | 김동철 | Foil printing method using uv ink printer |
| US20200070555A1 (en) * | 2017-05-22 | 2020-03-05 | Xeikon Manufacturing N.V. | Method for curing of an ink or toner layer and printing system with curing unit |
| EP3718777A1 (en) | 2019-04-02 | 2020-10-07 | Heidelberger Druckmaschinen AG | Device for hardening uv ink on a printing substrate |
| WO2022135000A1 (en) * | 2020-12-22 | 2022-06-30 | 3M Innovative Properties Company | Electronic telecommunications articles comprising crosslinked fluoropolymer and fluoropolymer particles, compositions and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118056683A (en) | 2024-05-21 |
| EP4371778A1 (en) | 2024-05-22 |
| US20240165967A1 (en) | 2024-05-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE602004009158T2 (en) | Ultraviolet curing | |
| DE69505640T2 (en) | METHOD AND METHOD FOR APPLYING RADIATION PRINTABLE INKS IN A FLEXOGRAPHIC PRINTING SYSTEM | |
| DE69833974T2 (en) | Apparatus for curing inks by means of UV light | |
| DE69606644T2 (en) | INK-JET PRINTER WITH DEVICE FOR DRYING THE INK AND ITS OPERATING METHOD | |
| EP2067620B1 (en) | Method for drying a multicolour printed material | |
| DE102012216320A1 (en) | Pre-treatment methods, apparatus and systems for contact leveling radiation-drying gel inks | |
| DE102012219246A1 (en) | DIGITAL CURING METHODS AND SYSTEMS FOR ENERGY SAVING PRINTING PACKAGING USING RADIATION-HARDENABLE PRINTING CROCHET | |
| DE102012212751B4 (en) | METHOD, DEVICE AND SYSTEMS FOR DISTRIBUTING RADIANT CURABLE GEL INK | |
| DE112010001209T5 (en) | Distributed light sources and photoreactive curing systems | |
| WO2007068322A1 (en) | Apparatus for carrying out a method to modify surfaces of radiation-hardenable colours and paints by photochemical microfolding by means of short-wave, monochromatic uv radiation under stable irradiation and inerting conditions | |
| DE102009017954A1 (en) | UV radiation device for e.g. printing machine, for UV hardening fresh printing ink on printed sheet, has UV-LED array arranged at distance to material sheet to be irradiated and perpendicular to transport direction over irradiation breadth | |
| EP1466732B1 (en) | Process for drying printing colour on a printing substrate, and printing unit adapted for carrying out the process | |
| EP4371779A1 (en) | Method for curing uv-curable inkjet ink in a printing machine | |
| DE102009021634A1 (en) | Method for color printing of personalization document, involves tightening personalization document under print head and controlling UV LEDs in sections by electronic control, so that UV LEDs are illuminated | |
| DE602004009115T2 (en) | Liquid jet apparatus | |
| EP1908528A2 (en) | Central dryer for electron beam hardening | |
| DE4342643C2 (en) | Low-temperature fixation with barrier discharge in inkjet printers | |
| DE102019124309A1 (en) | Apparatus and method for producing matting-modulated polymer layers | |
| DE10106888A1 (en) | Surface coating production comprises activating starting material using short wavelength electromagnetic radiation, e.g. below visible region | |
| EP2160652A2 (en) | Contact exposure device for a printing screen | |
| DE102017107041A1 (en) | Method and device for UV curing of a photohardenable substance | |
| DE102022103993A1 (en) | Process for curing coatings in a printing press using differently controlled gas discharge lamps | |
| DE102004036827B4 (en) | microwave heating | |
| DE102011007737A1 (en) | Method of leveling ink on substrates using flash heating and devices suitable for printing | |
| EP4112307A1 (en) | Device for curing a uv-curable fluid on a printing substrate with a radiator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR |