EP4371779A1 - Procédé de durcissement d'encre pour jet d'encre durcissable par uv dans une presse d'impression - Google Patents

Procédé de durcissement d'encre pour jet d'encre durcissable par uv dans une presse d'impression Download PDF

Info

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
Application number
EP23206605.0A
Other languages
German (de)
English (en)
Inventor
Matthias Schlörholz
Michael Kohlmann
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP4371779A1 publication Critical patent/EP4371779A1/fr
Pending legal-status Critical Current

Links

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
    • 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
    • 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

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)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Ink Jet (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP23206605.0A 2022-11-21 2023-10-30 Procédé de durcissement d'encre pour jet d'encre durcissable par uv dans une presse d'impression Pending EP4371779A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22208481.6A EP4371778A1 (fr) 2022-11-21 2022-11-21 Procédé de durcissement d'un milieu durcissable aux uv dans une machine d'impression

Publications (1)

Publication Number Publication Date
EP4371779A1 true EP4371779A1 (fr) 2024-05-22

Family

ID=84360791

Family Applications (2)

Application Number Title Priority Date Filing Date
EP22208481.6A Pending EP4371778A1 (fr) 2022-11-21 2022-11-21 Procédé de durcissement d'un milieu durcissable aux uv dans une machine d'impression
EP23206605.0A Pending EP4371779A1 (fr) 2022-11-21 2023-10-30 Procédé de durcissement d'encre pour jet d'encre durcissable par uv dans une presse d'impression

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP22208481.6A Pending EP4371778A1 (fr) 2022-11-21 2022-11-21 Procédé de durcissement d'un milieu durcissable aux uv dans une machine d'impression

Country Status (3)

Country Link
US (1) US20240165967A1 (fr)
EP (2) EP4371778A1 (fr)
CN (1) CN118056683A (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010274584A (ja) * 2009-05-29 2010-12-09 Afit Corp インクジェットによる画像形成方法
JP2014024264A (ja) * 2012-07-27 2014-02-06 Kyocera Corp 光照射装置および印刷装置
JP2014076639A (ja) * 2012-09-24 2014-05-01 Mimaki Engineering Co Ltd 印刷方法及び印刷装置
JP2017043079A (ja) * 2015-08-29 2017-03-02 京セラ株式会社 印刷方法
KR20180075049A (ko) * 2016-12-26 2018-07-04 김동철 Uv잉크 인쇄유닛을 이용한 박 인쇄방법
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 (fr) 2019-04-02 2020-10-07 Heidelberger Druckmaschinen AG Dispositif de durcissement d'une encre uv sur un matériau à imprimer
WO2022135000A1 (fr) * 2020-12-22 2022-06-30 3M Innovative Properties Company Articles de télécommunications électroniques comprenant un fluoropolymère réticulé et des particules de fluoropolymère, compositions et procédés

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6127380B2 (ja) * 2012-04-27 2017-05-17 セイコーエプソン株式会社 印刷装置及び印刷方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010274584A (ja) * 2009-05-29 2010-12-09 Afit Corp インクジェットによる画像形成方法
JP2014024264A (ja) * 2012-07-27 2014-02-06 Kyocera Corp 光照射装置および印刷装置
JP2014076639A (ja) * 2012-09-24 2014-05-01 Mimaki Engineering Co Ltd 印刷方法及び印刷装置
JP2017043079A (ja) * 2015-08-29 2017-03-02 京セラ株式会社 印刷方法
KR20180075049A (ko) * 2016-12-26 2018-07-04 김동철 Uv잉크 인쇄유닛을 이용한 박 인쇄방법
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 (fr) 2019-04-02 2020-10-07 Heidelberger Druckmaschinen AG Dispositif de durcissement d'une encre uv sur un matériau à imprimer
WO2022135000A1 (fr) * 2020-12-22 2022-06-30 3M Innovative Properties Company Articles de télécommunications électroniques comprenant un fluoropolymère réticulé et des particules de fluoropolymère, compositions et procédés

Also Published As

Publication number Publication date
EP4371778A1 (fr) 2024-05-22
US20240165967A1 (en) 2024-05-23
CN118056683A (zh) 2024-05-21

Similar Documents

Publication Publication Date Title
DE602004009158T2 (de) Ultravioletthärtung
DE69833974T2 (de) Vorrichtung zum Härten von Tinten mittels UV-Licht
EP2067620B1 (fr) Procédé pour sécher une matière imprimée en polychromie
DE102012216320A1 (de) Vorbehandlungsverfahren, -geräte und -systeme zur Kontaktnivellierung strahlungstrocknender Geltinten
DE102012219246A1 (de) Digitale härtungsverfahren und systeme zum energiesparenden drucken von verpackung unter verwendung von strahlungshärtbaren druckerschwärzen
DE102012212751B4 (de) Verfahren, vorrichtung und systeme zum verteilen von strahlenhärtbarer geltinte
DE112010001209T5 (de) Verteilte Lichtquellen und Systeme für photoreaktives Aushärten
WO2007068322A1 (fr) Dispositif en vue de la mise en oeuvre d'un procede de modification de la surface de couleurs et de vernis durcissables par rayonnement, par microdissociation photochimique a l'aide d'un rayonnement uv monochromatique de courte longueur d'onde dans des conditions stables d'irradiation et d'inertisation
DE10316472A1 (de) Verfahren zum Trocknen einer Druckfarbe auf einem Bedruckstoff in einer Druckmaschine und Druckmaschine
DE10024456A1 (de) Integrierte Laser- und UV-Belichtung von Druckplatten
DE102015215335A1 (de) Vorrichtung und Verfahren zum Auftragen und Bestrahlen von Tinten
EP1466732B1 (fr) Procédé pour sécher de l'encre d'imprimerie sur un substrat d'impression et unité d'impression pour la mise en oeuvre du procédé
EP4371779A1 (fr) Procédé de durcissement d'encre pour jet d'encre durcissable par uv dans une presse d'impression
DE102009017954A1 (de) UV-Bestrahlungsvorrichtung
DE102009021634A1 (de) Verfahren und Vorrichtung zum farbigen Bedrucken von Personalisierungsdokumenten
EP1908528A2 (fr) Séchoir central pour le durcissement par faisceau d'électrons
DE4342643C2 (de) Erwärmungsarme Fixierung mit Barrierenentladung in Tintenstrahldruckern
DE102019124309A1 (de) Vorrichtung und Verfahren zur Erzeugung mattierungsmodulierter Polymerschichten
DE10106888A1 (de) Verfahren und Vorrichtung zur Herstellung einer Oberflächenbeschichtung
EP2160652A2 (fr) Dispositif d'exposition par contact d'un pochoir
DE102017107041A1 (de) Verfahren und Vorrichtung zur UV-Härtung einer lichthärtbaren Substanz
DE102022103993A1 (de) Verfahren zum Härten von Beschichtungen in einer Druckmaschine mittels unterschiedlich angesteuerter Gasentladungslampen
DE102011007737A1 (de) Verfahren zum Höhenausgleich von Tinte auf Substraten unter Anwendung einer Blitzlichterwärmung und Vorrichtungen, die zum Drucken geeignet sind
EP4112307A1 (fr) Dispositif de durcissement d'un fluide durcissable aux uv sur un support imprimé doté d'un émetteur
WO2003074193A2 (fr) Procede et dispositif de production d'un revetement de surface

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