EP3795934A1 - Procédé de durcissement de l'encre sur un matériau à imprimer - Google Patents

Procédé de durcissement de l'encre sur un matériau à imprimer Download PDF

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Publication number
EP3795934A1
EP3795934A1 EP19197749.5A EP19197749A EP3795934A1 EP 3795934 A1 EP3795934 A1 EP 3795934A1 EP 19197749 A EP19197749 A EP 19197749A EP 3795934 A1 EP3795934 A1 EP 3795934A1
Authority
EP
European Patent Office
Prior art keywords
ink
inert gas
radiator
radiation
curing
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
EP19197749.5A
Other languages
German (de)
English (en)
Inventor
Dr. Jorge Manuel Caramelo Soares
Dr. Peter Hachmann
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
Priority to EP19197749.5A priority Critical patent/EP3795934A1/fr
Priority to CN202010547669.8A priority patent/CN112519408A/zh
Publication of EP3795934A1 publication Critical patent/EP3795934A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection

Definitions

  • the present invention relates to a method for curing ink on a printing substrate according to the preamble of claim 1.
  • the invention is in the technical field of the graphics industry and there in particular in the field of curing, in particular curing with UV radiation, of liquid ink on sheet or web-shaped printing materials, preferably made of paper, cardboard, cardboard, plastic or composite material.
  • the drying and / or hardening (or more generally: the treatment) of preferably liquid or pasty printing media / fluids (such as printing ink, varnish or ink) on a printing material can be done in various ways, which can also be combined: by applying hot air, with electromagnetic radiation (e.g. UV or IR) or particle radiation (e.g. electrons) or by contacting the printing material with heated surfaces (e.g. cylinders, rollers or belts).
  • Water-based printing media are usually dried thermally, preferably with IR, while polymerizable printing media are usually dried with UV.
  • Mercury vapor lamps and increasingly LED lamps are used as UV radiation sources. It is known that UV-curable inks can be hardened under an inert gas.
  • UV-curable inks can take place in several steps, for example so-called pinning (pre-curing) and then final curing can take place first
  • WO2019007979A1 discloses UV curing and subsequent UV curing under Inert gas.
  • the EP3045477A1 reveals something similar.
  • the EP2767407B1 also discloses something similar, the initial hardening being a so-called pinning. According to these documents, the last curing step in each case takes place under inert gas.
  • the EP1473341B1 discloses two UV curing steps; both under inert gas.
  • the EP2596874A1 discloses drying (not UV curing) under inert gas and subsequent UV curing.
  • the problem can arise that the result of UV curing of the ink is not sufficient (insufficient crosslinking / polymerization of the UV-curable ink) and that consequently problematic migration of low-molecular and potentially health-endangering ink components into packaging products, e.g. food, is to be expected.
  • a (re) formulation of the ink with higher molecular weight and therefore less migrating components is possible, but this reduces the viscosity of the ink, which can lead to problems when printing the ink.
  • inert gas can prevent undesired migration, since fewer (potentially migrating) inhibitors can be used in the ink in a curing environment that is poor in oxygen.
  • curing under inert gas is costly, among other things. because a lot of space is required for the corresponding components and inert gas is required.
  • a method for curing ink on a printing material wherein at least one UV-curable ink is applied in the form of drops to a printing material and exposed to UV radiation by means of at least one first UV radiator and thereby pre-cured, is characterized in that the ink is exposed to UV radiation by means of at least one second UV radiator of a UV dryer under inert gas, under inert gas-enriched air or under oxygen-reduced air and is thereby further hardened, and that the ink is then further hardened by means of at least one third UV radiator of a further UV The dryer is exposed to UV radiation and thereby post-cured.
  • the invention advantageously enables UV-curable inks to be cured sufficiently so that undesired migration of low-molecular ink constituents is reduced or avoided.
  • hardening takes place in three successive steps: pre-hardening or so-called pinning, further hardening and post-hardening.
  • the pre-hardening serves to increase the viscosity of the ink on the printing material and thereby prevent the ink from running too heavily on the printing material, in particular the printing dots generated by ink droplets on the printing material.
  • the viscosity is only slightly increased; in particular, the ink has not yet hardened through. This can improve the print quality, in particular by preventing inks of different colors from running into one another (so-called "inter color bleeding").
  • the further hardening serves to further increase the viscosity of the ink (in relation to the pre-hardening).
  • the ink then adheres well to the substrate and has adequate abrasion resistance.
  • the further hardening is preferably carried out in such a way that more than 90% of the double bonds are converted in the ink.
  • Post-curing ultimately serves to combine monomers still present in the ink and thereby reduce or prevent potential migration.
  • the second hardening step (referred to as "further hardening” or alternatively: intermediate hardening) - and preferably only this step - takes place under inert gas, inert gas-enriched air or under oxygen-reduced air, i.e. not under ambient air like the other two steps.
  • the post-curing (alternatively referred to as: final curing) ensures that the ink is largely and preferably essentially completely cured when it leaves the printing press.
  • inert gas alternatively referred to as protective gas
  • inert gas-enriched air or under oxygen-reduced air whereas all other curing steps are preferably carried out under untreated air, for example ambient air.
  • inert gas means that essentially pure inert gas, for example nitrogen or helium, is preferably used.
  • air enriched with inert gas means that the proportion of inert gas, for example nitrogen or helium, in the air used or another gas mixture used is preferably significantly higher than in the ambient air.
  • Under oxygen-reduced air means that the proportion of oxygen in the air used or another gas mixture used is preferably significantly reduced compared to the ambient air.
  • the increase or decrease is "essential" if this measure preferably achieves that i) an inhibition of the radicals generated by UV photons and photoinitiators, which is problematic with regard to migration, is avoided, and / or that ii) one with regard to migration insufficient and therefore problematic crosslinking is avoided or sufficient crosslinking is achieved and / or that iii) the amount of (potentially migrating and therefore health-endangering) Photoinitiators in the ink can be reduced to a level that is problem-free with regard to migration.
  • a device for hardening under inert gas or the like e.g. an inert gas housing including inert gas supply and discharge, can advantageously be limited to the second hardening step or its location or station. As a result, installation space, components and the associated costs can be saved. In addition, the amount of inert gas required can be reduced.
  • a preferred development of the invention can be characterized in that the ink is exposed to UV radiation by means of the first UV radiator under air.
  • An inert gas device is not required here. Installation space and costs can be saved.
  • a preferred development of the invention can be characterized in that the ink is exposed to UV radiation by means of the third UV radiator under air.
  • An inert gas device is also not required here. Installation space and costs can be saved.
  • a preferred development of the invention can be characterized in that nitrogen, alternatively helium, is used as the inert gas or protective gas.
  • a preferred development of the invention can be characterized in that the UV dryer comprises several second UV emitters, e.g. two, three or four.
  • a preferred development of the invention can be characterized in that the second UV radiators are arranged in a common inert gas housing.
  • the housing can be formed from sheet metal, with a shape adaptation, for example a curvature, preferably being made to the transport path.
  • a preferred development of the invention can be characterized in that the further UV dryer comprises several third UV radiators, e.g. two, three or four.
  • the further UV dryer comprises at least two stations spaced apart from one another with a plurality of third or a plurality of fourth UV emitters.
  • the substrate can be guided by means of several deflection rollers, e.g. in a meander shape.
  • a preferred development of the invention can be characterized in that at least one second UV radiator and / or at least one third UV radiator and / or at least one fourth UV radiator hardens the ink through the printing material.
  • This development is particularly advantageous for (UV) transparent substrates.
  • the ink is preferably applied to a front side of the printing material and at least one radiator is arranged in the space on the rear side of the printing material, or vice versa.
  • a preferred development of the invention can be characterized in that the printing material is moved along the at least one second UV radiator by means of a preferably heated temperature control roller that supports the curing treatment.
  • Figure 1 shows a schematic representation of an inkjet printing machine 1 (in short: machine) when carrying out a preferred embodiment of the method according to the invention.
  • the machine processes printing material 2 in web form, preferably paper, cardboard or plastic film.
  • the printing material is fed, for example, from a roll feeder and then printed with ink.
  • Printing takes place in a first station 3 of the machine, namely in an ink printing unit 3 with several, preferably eight rows of print heads 4 each with several ink heads for generating ink droplets (preferably corresponding to a print image to be printed).
  • a respective first UV radiator 5 is preferably arranged directly downstream of each print head row.
  • These emitters are used to pre-harden, i.e. only partially polymerize, the ink (so-called pinning).
  • the exposure to UV radiation takes place here preferably under air, for example ambient air unchanged in its composition, and not under an inert gas other than air.
  • the Pinning is preferably done with UV radiation of 385 nm or (for white ink) of 395 nm wavelength.
  • the printing material 2 leaves the first station at B and is passed on to C, where it is fed to a second station 10.
  • the second station forms a UV dryer 10 with at least one, but preferably several second UV radiators 11, for. B. two UV emitters 11a and 11b. These emitters are used for further hardening, preferably for extensive (but still not complete) hardening or polymerizing of the ink.
  • the further hardening of the ink does not take place under (ambient) air, but under an inert gas, under inert gas-enriched air or under oxygen-reduced air or similar functions.
  • the inert gas used is preferably nitrogen; alternatively, helium or another noble gas can be used.
  • the UV emitters 11 can be designed, for example, as UV lamps, preferably mercury vapor lamps or alternatively UV LED emitters and each have between 200 and 300 W / cm (assuming a web transport speed of about 50 m / min).
  • an inert gas housing 12 which preferably houses the second UV radiators 11 together. This can be formed from sheet metal. It has an inert gas feed line 13 and an inert gas discharge line 14.
  • the temperature control in particular heating, can support the hardening process.
  • the temperature of the surface can preferably be between 40 and 50 ° C. and can preferably be regulated as a function of the speed.
  • the printing material web 2 can then be passed through an optional flexographic printing unit 15 in which UV-curable lacquer can preferably be applied.
  • the web 2 leaves the second station 10 and at E becomes a third station 20, ie a further UV dryer 20 and at F 'optionally a fourth station 30, ie one again another UV dryer 30 is supplied.
  • the third and fourth stations can be arranged at a distance from one another, in particular the path 2 between E 'and F' can have a meandering path.
  • the third station 20 comprises at least one, but preferably several third UV radiators 21, e.g. B. two UV emitters 21a and 21b. These emitters are used to post-harden the ink, preferably to substantially completely harden or polymerize the already pre-hardened and further hardened (and thereby preferably largely hardened) ink.
  • the optional fourth station 30 comprises at least one, but preferably several further third UV emitters 31, e.g. B. two UV emitters 31a and 31b. These emitters are also used for post-curing.
  • the third radiators 21 and the further third radiators 31 can be referred to collectively as “third radiators”.
  • the third UV radiator 21 and the optional further third UV radiator 31 can preferably be designed as mercury vapor lamps or alternatively UV-LED radiators and each have between 100 and 200 W / cm (assuming a web transport speed of about 50 m / min).
  • the post-curing in the third and the optional fourth station is preferably carried out under air, e.g. ambient air unchanged in its composition, and not under an inert gas other than air.
  • the post-curing of the ink, i.e. exposure to UV radiation, in the third and / or fourth station can be carried out from the printed side 40 of the printing material (cf. Figure 2 ) or it can be done through the printing substrate 2 (from the unprinted rear side of the printing substrate).
  • a combination (of the printed and the unprinted side of the substrate) is also possible: B. irradiation in the third station 20 from the printed side and in the fourth station 30 from the unprinted side.
  • the second station 10 can also Irradiation take place from the unprinted side (through the printing material 2) and therefore different from what is shown in the figures.
  • the method according to the invention thus comprises i) UV pre-curing under air, then ii) further UV curing under inert gas, under inert gas-enriched air or under oxygen-reduced air or the similar and finally iii) the UV post-curing in air. Further upstream, intermediate or downstream UV curing steps or temperature control steps are also possible.
  • Figure 2 shows (also schematically) a side view of the machine 1 from FIG Figure 1 when carrying out the preferred embodiment of the method according to the invention.
  • the web path 41 of the printing material 2 preferably runs in a meander shape and can include several deflecting rollers 6.
  • the inert gas housing 12 can, as shown, be arranged in the area of the web guide by means of the temperature control roller 7. It can comprise (inlet and outlet) diaphragms 9 which have the effect that inert gas fed to the housing 12 at 13 is essentially discharged again at 14 and does not escape in an uncontrolled manner at other points.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Microbiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Textile Engineering (AREA)
  • Printing Methods (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Ink Jet (AREA)
EP19197749.5A 2019-09-17 2019-09-17 Procédé de durcissement de l'encre sur un matériau à imprimer Pending EP3795934A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19197749.5A EP3795934A1 (fr) 2019-09-17 2019-09-17 Procédé de durcissement de l'encre sur un matériau à imprimer
CN202010547669.8A CN112519408A (zh) 2019-09-17 2020-06-16 用于硬化在承印材料上的油墨的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19197749.5A EP3795934A1 (fr) 2019-09-17 2019-09-17 Procédé de durcissement de l'encre sur un matériau à imprimer

Publications (1)

Publication Number Publication Date
EP3795934A1 true EP3795934A1 (fr) 2021-03-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19197749.5A Pending EP3795934A1 (fr) 2019-09-17 2019-09-17 Procédé de durcissement de l'encre sur un matériau à imprimer

Country Status (2)

Country Link
EP (1) EP3795934A1 (fr)
CN (1) CN112519408A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021102850A1 (de) 2021-02-08 2022-08-11 Canon Production Printing Holding B.V. Vorrichtung und Verfahren zum Bedrucken eines Aufzeichnungsträgers mit UV-Tinte in einem Druckgerät

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6550905B1 (en) * 2001-11-19 2003-04-22 Dotrix N.V. Radiation curable inkjet ink relatively free of photoinitiator and method and apparatus of curing the ink
US20050104946A1 (en) * 2003-01-09 2005-05-19 Con-Trol-Cure, Inc. Ink jet UV curing
DE102006057969A1 (de) * 2006-09-02 2008-03-13 Bengt Laurell Zentraltrockner für mehrere Auftragswerke
EP2596874A1 (fr) 2010-07-22 2013-05-29 Konica Minolta Holdings, Inc. Procédé de production d'un film barrière contre un gaz
EP2767407A1 (fr) 2013-02-19 2014-08-20 FUJIFILM Corporation Procédé d'enregistrement à jet d'encre et dispositif
US20160200924A1 (en) * 2013-09-16 2016-07-14 Agfa Graphics Nv Radiation curable compositions for food packaging
EP3045477A1 (fr) 2015-01-16 2016-07-20 IOT - Innovative Oberflächentechnologien GmbH Procédé de réduction de la migration de photo-initiateurs et leur produits de dégradation dans des revêtements durcissant aux rayons UV
WO2019007979A1 (fr) 2017-07-05 2019-01-10 Sig Technology Ag Impression par jet d'encre d'un motif sur une surface d'un composite d'emballage à l'aide d'encre séchable par rayonnement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850836A1 (de) * 1998-11-04 2000-05-11 Sebald U E Trocknungsverfahren
AUPQ422999A0 (en) * 1999-11-24 1999-12-16 Note Printing Australia Limited Apparatus and method for uv curing of intaglio printing
WO2003020522A1 (fr) * 2001-08-29 2003-03-13 Eltosch Thorsten Schmidt Gmbh Système de séchage par rayonnement
JP2012217873A (ja) * 2011-04-04 2012-11-12 Panasonic Corp 紫外線照射装置
DE102017217881A1 (de) * 2016-11-08 2018-05-09 Heidelberger Druckmaschinen Ag Verfahren zum Betreiben einer UV-Härtungsvorrichtung einer Druckmaschine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6550905B1 (en) * 2001-11-19 2003-04-22 Dotrix N.V. Radiation curable inkjet ink relatively free of photoinitiator and method and apparatus of curing the ink
EP1473341A1 (fr) 2001-11-19 2004-11-03 Agfa-Gevaert Encre pour imprimante à jet d'encre avec une faible teneur en photoinitiateur et méthode et appareil de durcissement de celle-ci.
US20050104946A1 (en) * 2003-01-09 2005-05-19 Con-Trol-Cure, Inc. Ink jet UV curing
DE102006057969A1 (de) * 2006-09-02 2008-03-13 Bengt Laurell Zentraltrockner für mehrere Auftragswerke
EP2596874A1 (fr) 2010-07-22 2013-05-29 Konica Minolta Holdings, Inc. Procédé de production d'un film barrière contre un gaz
EP2767407A1 (fr) 2013-02-19 2014-08-20 FUJIFILM Corporation Procédé d'enregistrement à jet d'encre et dispositif
US20160200924A1 (en) * 2013-09-16 2016-07-14 Agfa Graphics Nv Radiation curable compositions for food packaging
EP3045477A1 (fr) 2015-01-16 2016-07-20 IOT - Innovative Oberflächentechnologien GmbH Procédé de réduction de la migration de photo-initiateurs et leur produits de dégradation dans des revêtements durcissant aux rayons UV
WO2019007979A1 (fr) 2017-07-05 2019-01-10 Sig Technology Ag Impression par jet d'encre d'un motif sur une surface d'un composite d'emballage à l'aide d'encre séchable par rayonnement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021102850A1 (de) 2021-02-08 2022-08-11 Canon Production Printing Holding B.V. Vorrichtung und Verfahren zum Bedrucken eines Aufzeichnungsträgers mit UV-Tinte in einem Druckgerät
DE102021102850B4 (de) 2021-02-08 2022-09-01 Canon Production Printing Holding B.V. Vorrichtung und Verfahren zum Bedrucken eines Aufzeichnungsträgers mit UV-Tinte in einem Druckgerät

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