EP4371778A1 - Procédé de durcissement d'un milieu durcissable aux uv dans une machine d'impression - Google Patents
Procédé de durcissement d'un milieu durcissable aux uv dans une machine d'impression Download PDFInfo
- Publication number
- EP4371778A1 EP4371778A1 EP22208481.6A EP22208481A EP4371778A1 EP 4371778 A1 EP4371778 A1 EP 4371778A1 EP 22208481 A EP22208481 A EP 22208481A EP 4371778 A1 EP4371778 A1 EP 4371778A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light source
- curable medium
- radiation
- light
- curable
- 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 34
- 238000007639 printing Methods 0.000 title claims abstract description 32
- 230000005855 radiation Effects 0.000 claims abstract description 29
- 239000000976 ink Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000007641 inkjet printing Methods 0.000 claims description 8
- 239000002966 varnish Substances 0.000 claims description 7
- 239000000123 paper Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 229910052724 xenon Inorganic materials 0.000 claims description 6
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 2
- 238000001723 curing Methods 0.000 description 48
- 239000007789 gas Substances 0.000 description 10
- 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
- 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
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 238000005507 spraying Methods 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 media such as UV inkjet inks or UV varnishes in a printing machine.
- UV-curable printing media such as UV inkjet inks and UV varnishes.
- UV-curable media that are to be cured by UV radiation usually contain one or more photoinitiators. After printing on the substrate such as paper, cardboard or film, the UV-curable media 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 media 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 medium 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 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 media 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 light-emitting diodes are used for both initial curing and final curing, whereby the radiation emitted by the UV light-emitting diodes is more strongly focused during initial curing than during final curing and the irradiation time is shorter during initial curing 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.
- the method according to the invention enables rapid and complete curing of the UV-curable medium on the substrate in the printing press.
- 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 by expensive cooling.
- the use of mercury vapor lamps in the printing press 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 a UV-curable medium in a printing machine, in which, in a first step, the UV-curable medium is irradiated with UV radiation from a first light source and thereby partially cured, and in a second step the partially cured UV-curable medium is irradiated with UV radiation from a second light source and thereby finally cured, wherein the UV-curable medium 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 medium 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 .
- the reactive UV-curable medium is not yet fully converted. However, further processing in the printing machine is possible in this state without any disadvantages, particularly for the printed image.
- the final “final curing” process the already partially cured, still reactive UV-curable medium is then essentially completely cured and thus reacted, so that after it is discharged from the printing machine and later used commercially, no disadvantages such as smearing or discoloration occur.
- the irradiance S 1 that is applied to the UV-curable medium in the first step of curing is lower than the irradiance S 2 that is applied to the cured UV-curable medium 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 first light source and the second light source are each independently selected from at least one light-emitting diode and at least one flash lamp, preferably from UV light-emitting diodes and gas discharge lamps, especially xenon gas discharge lamps.
- UV light-emitting diodes or 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.
- Flash lamps are also known in principle to those 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 over UV light-emitting diodes that the parameters of the different irradiation intensities and irradiation durations according to the invention can be set particularly easily by selecting the appropriate electrode voltage, current intensity and duration of the discharge.
- the first light source is selected from at least one light-emitting diode, the UV radiation of which is focused by means of an optical device.
- the optical device comprises at least one optical lens. 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.
- no focusing of the UV radiation is carried out in the second step. Accordingly, only in the first step of initial curing is the UV radiation of the first light source focused and the UV radiation of the second light source, preferably at least one UV light-emitting diode or at least one flash lamp, is not focused in the second step of final curing.
- the UV radiation of the light source preferably at least one light-emitting diode
- the UV radiation of the light source is then focused more weakly in the second step than in the first step.
- the irradiance of the UV radiation in the second step i.e. the final curing
- the UV radiation of the light source is focused in the second step by means of an optical device, very particularly preferably by means of an optical device which comprises at least one optical lens.
- the wavelength spectrum of the at least one light-emitting diode in the first step is substantially identical to the wavelength spectrum of the at least one light-emitting diode in the second step.
- identically constructed light-emitting diodes are used in the first step and in the second step.
- the first light source and the second light source are each selected from at least one flash lamp, in particular from at least one xenon gas discharge lamp.
- the at least one flash lamp selected as the first light source and the at least one flash lamp selected as the second light source are of identical construction and the at least one flash lamp selected as the first light source and the at least one flash lamp selected as the second light source are electrically controlled differently.
- at least one xenon gas discharge lamp is used as the first and second light source.
- the first light source is located at a different location than the second light source.
- two separate light sources are used.
- the UV-curable medium is selected from UV-curable inkjet inks and UV-curable varnishes.
- Such UV-curable media are known in principle to the person skilled in the art and generally comprise one or more 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 medium comprises one or more photoinitiators.
- UV inkjet inks that can be printed in inkjet printing machines can be used as UV-curable inkjet inks.
- the selection of UV-curable varnishes is also not limited and in principle includes all UV varnishes that can be printed in inkjet printing machines.
- the printing machine in which the method according to the invention is carried out is an inkjet printing machine, which usually comprises at least one inkjet print head and one or more curing devices.
- the UV-curable medium is located on a printing material selected from paper, cardboard and film.
- the UV-curable medium is usually printed onto one of the printing materials mentioned, for example using one or more inkjet print heads.
- the UV-curable medium it is also possible for the UV-curable medium to be applied to the printing material by other methods, for example by spraying using a nozzle, which is particularly preferred for UV varnishes.
- 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, preferably only the second step of the final curing is carried out 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 (2) for example paper
- a printing material (2) for example paper
- the printed paper is then coated with the hardened UV inkjet ink further conveyed through the inkjet printing machine (1), printed with other colors if necessary, and finally conveyed to the UV light emitting diode (4) for final curing.
- the finished printed product is discharged from the inkjet printing machine (1).
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)
Priority Applications (4)
| 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 |
| EP23206605.0A 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 |
| CN202311552578.3A CN118056683A (zh) | 2022-11-21 | 2023-11-21 | 用于在印刷机中对紫外可固化型喷墨油墨进行固化的方法 |
| US18/515,579 US20240165967A1 (en) | 2022-11-21 | 2023-11-21 | Method of curing uv-curable inkjet ink in a printing machine |
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 |
|---|---|
| EP4371778A1 true EP4371778A1 (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 After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20240165967A1 (fr) |
| EP (2) | EP4371778A1 (fr) |
| CN (1) | CN118056683A (fr) |
Citations (9)
| 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 |
| US20130286095A1 (en) * | 2012-04-27 | 2013-10-31 | Seiko Epson Corporation | Print apparatus and print method |
| 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 |
-
2022
- 2022-11-21 EP EP22208481.6A patent/EP4371778A1/fr active Pending
-
2023
- 2023-10-30 EP EP23206605.0A patent/EP4371779A1/fr active Pending
- 2023-11-21 US US18/515,579 patent/US20240165967A1/en active Pending
- 2023-11-21 CN CN202311552578.3A patent/CN118056683A/zh active Pending
Patent Citations (9)
| 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 |
| US20130286095A1 (en) * | 2012-04-27 | 2013-10-31 | Seiko Epson Corporation | Print apparatus and print method |
| 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 |
|---|---|
| US20240165967A1 (en) | 2024-05-23 |
| EP4371779A1 (fr) | 2024-05-22 |
| CN118056683A (zh) | 2024-05-21 |
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