EP3590723A1 - Procédé d'impression et séchage - Google Patents

Procédé d'impression et séchage Download PDF

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Publication number
EP3590723A1
EP3590723A1 EP19176677.3A EP19176677A EP3590723A1 EP 3590723 A1 EP3590723 A1 EP 3590723A1 EP 19176677 A EP19176677 A EP 19176677A EP 3590723 A1 EP3590723 A1 EP 3590723A1
Authority
EP
European Patent Office
Prior art keywords
substrate
ink
humectant
drying
water
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.)
Withdrawn
Application number
EP19176677.3A
Other languages
German (de)
English (en)
Inventor
Wolfgang Schönberger
Peter Hachmann
Christian Hieb
Rolf Müller
l Sauer Michael Sauer
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 EP3590723A1 publication Critical patent/EP3590723A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat

Definitions

  • the invention relates to a method having the features of claim 1.
  • the invention lies in the technical field of the graphics industry and there in particular in the area of printing and drying of inks containing water and humectants, thus in the area of so-called inkjet printing.
  • Inks which contain humectants (or evaporation inhibitors or "humectants") which ensure that the ink on the ink print head or its nozzle surface does not dry out. Such humectants undesirably get onto the substrate, e.g. on paper.
  • the invention relates to a method for printing and drying, in which an ink containing water and humectant is printed on a substrate using the ink printing method, the moisture of the substrate being increased, and first of all the water of the printed ink being evaporated substantially completely during a first drying step and then the humectant is evaporated during a second drying step.
  • the invention advantageously enables substrates printed with ink to be optimally dried. Problems that can be caused by humectants on the substrate can be prevented.
  • the second drying step can preferably take the form of a brief burst of heat which essentially completely removes the humectant from the substrate surface and thereby protects the substrate.
  • the substrate can be an absorbent substrate, for example paper or cardboard; Water from the ink can get onto such a substrate and then into the substrate.
  • the substrate can be a laminated substrate, for example laminated paper or laminated cardboard; Such a substrate may already contain water.
  • a preferred development of the invention can be characterized in that the evaporation of the water takes place during a first predetermined period of time with hot air and / or with radiation primarily coupling to the water molecules or to pigments contained in the ink.
  • a preferred development of the invention can be characterized in that the water is evaporated i) with hot air or ii) with hot air and infrared radiation, or iii) with ultraviolet radiation, with high-frequency radiation or with microwave radiation.
  • a preferred development of the invention can be characterized in that the duration of the first predetermined time period is in the range between 1 and 5 seconds.
  • a preferred development of the invention can be characterized in that the evaporation of the humectant takes place during a second predetermined period of time with hot air and / or with radiation primarily coupling to the humectant or to pigments contained in the ink.
  • a preferred development of the invention can be characterized in that the evaporation of the humectant takes place with hot air and / or with ultraviolet radiation.
  • a preferred development of the invention can be characterized in that the evaporation of the humectant with hot air and / or with ultraviolet radiation with at least one wavelength in the range from 365 to 405 nanometers or with at least one wavelength in the range from 365 to 395 nanometers or with a Wavelength of 385 nanometers.
  • a preferred development of the invention can be characterized in that the duration of the second predetermined time period is in the range between 0.1 and 0.5 seconds.
  • a preferred development of the invention can be characterized in that the first drying step is carried out at a temperature in the range between 50 ° C. and 100 ° C., preferably just below 100 ° C.
  • a preferred development of the invention can be characterized in that the second drying step takes place at a temperature in the range between 150 ° C and 250 ° C.
  • a preferred development of the invention can be characterized in that after the second drying step the substrate is cooled with blown air, preferably with ambient air sucked in and particularly preferably with cooled ambient air. This can advantageously prevent heat from entering the substrate, or deeper layers of the substrate, from heat conduction and from undesirably increasing its mean temperature.
  • the in Figure 1 The flowchart shown of a preferred exemplary embodiment of the method according to the invention shows the following steps: Method step 1 (provision):
  • the substrate and the ink to be printed on the substrate are provided for carrying out the method according to the invention, in particular in a printing press.
  • the substrate can be paper, cardboard, cardboard or corrugated cardboard.
  • the ink is a water-based ink, ie it contains water as a solvent.
  • the ink also contains at least one humectant.
  • Process step 2 (printing): The ink provided is applied to the substrate provided in the ink printing process by image-wise transfer of ink drops.
  • the ink also gets water and humectant on the substrate.
  • the water increases the moisture of the substrate or its moisture content.
  • Process step 3 drying and in particular 3a (first drying step): First of all, the water of the printed ink is essentially completely evaporated. This evaporation is preferably carried out by exposure to i) hot air or ii) hot air and infrared radiation, or iii) ultraviolet radiation, high-frequency radiation or microwave radiation.
  • Method step 4a (stipulation of the first stipulated time period):
  • the first stipulated time period t 1 is stipulated for the duration of drying 3, ie the first drying step 3a.
  • This specification can be done by a computer of the printing press and corresponding control of a dryer and / or the printing press or their transport speed.
  • a dryer which can be switched in segments, its drying path can be controlled.
  • the transport speed of the substrate can be controlled.
  • Another alternative is that Providing a dryer with a fixed drying section, which corresponds to the time span t 1 at a fixed transport speed.
  • Process step 3 drying, in particular second drying step (3b): after step 3a, the humectant is evaporated. This evaporation is preferably carried out by applying hot air and / or ultraviolet radiation.
  • Step 4b (specification of the second specified time period):
  • the second specified time period t 2 is specified for the duration of the drying 3, ie the second drying step 3b.
  • the specification can be made in accordance with step 4a and the alternatives described there.
  • the diagram in Figure 2 shows the temperatures of the substrate 8 on its surface (temperature profile 5) and on average (temperature profile 6) during the drying process.
  • energy is continuously supplied to the substrate.
  • This phase preferably lasts about 1 to 2 seconds.
  • the surface temperature rises noticeably. Because of the heat conduction of the substrate, the temperature in the deeper layers of the substrate also rises, and thus on average with a time delay.
  • the drying energy still required is introduced in as short a time as possible.
  • a bursting of the paper as in phase t 3 is not to be feared here, since hardly any steam can form because the substrate is already dry.
  • the phase t 2 is preferably only a few tenths of a second long.
  • the surface temperature (curve 5) rises so quickly that the average temperature (curve 6) increases only slightly due to the limited thermal conductivity of the substrate. Only the top layer is preferably briefly heated, the lower layers in the substrate heat up less. Accordingly, the surface temperature suddenly drops again after phase t 2 because it is cooled down by the deeper layers of the substrate.
  • the drying according to the invention saves a lot of energy. So that the same amount of humectant can evaporate again in the steeper and shorter temperature peak as in the slower process corresponding to phase t 3 , the peak temperature is preferably somewhat higher.
  • the "heat shock" can be done by a selective or uniform drying process.
  • the energy only couples in where ink has been applied. That would be, for example, ultraviolet radiation with a wavelength of 385 nm.
  • UV lamps can be arranged in such a way that they light up focus on one spot. Alternatively, the light from several UV lamps can be concentrated using suitable lenses or mirrors.
  • the energy is injected everywhere, including at non-printed areas. However, drying of the unprinted areas is not desirable. However, since essentially only the uppermost layer is heated during the "heat surge", the drying takes place only in the uppermost layers. For example, hot air can be blown onto the sheet. The air is preferably between 200 and 500 ° C warm. Large amounts of air are preferably blown onto the paper from small nozzles (diameter ⁇ 5mm) and from a short distance (less than 20mm). Because of the high air velocities, this results in a good heat transfer coefficient. Together with the high air temperature, the necessary energy can be introduced within a few tenths of a second.
  • T 2 denotes in Figure 2 the mean peak temperature with heat shock
  • T 3 the mean peak temperature with normal heating
  • Fig. 3 shows a printing machine 14 with a feeder 7 for an arcuate substrate 8.
  • the drying is carried out by means of several first dryers 10. These can preferably be operated with hot air , combined with IR and hot air, or with UV, or microwave or high-frequency fields.
  • the dryers are arranged on cylinders.
  • the drying (second drying step 3b) then takes place with the second dryer 11 for the heat shock (preferably immediately after the last first dryer, with the sheet still warm).
  • the dryer 11 can be followed by a cooling device 11a or a cooler 11a, preferably for blowing air or cooled desire on the substrate 8.
  • the sheet can also be guided on belts or in grippers that are guided linearly.
  • a sheet-like substrate can be dried.
EP19176677.3A 2018-07-03 2019-05-27 Procédé d'impression et séchage Withdrawn EP3590723A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018210912.5A DE102018210912A1 (de) 2018-07-03 2018-07-03 Verfahren zum Drucken und Trocknen

Publications (1)

Publication Number Publication Date
EP3590723A1 true EP3590723A1 (fr) 2020-01-08

Family

ID=66655200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19176677.3A Withdrawn EP3590723A1 (fr) 2018-07-03 2019-05-27 Procédé d'impression et séchage

Country Status (3)

Country Link
EP (1) EP3590723A1 (fr)
CN (1) CN110667263A (fr)
DE (1) DE102018210912A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022086527A1 (fr) * 2020-10-22 2022-04-28 Hewlett-Packard Development Company, L.P. Modes d'impression avec retards de séchage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050176847A1 (en) * 2004-02-05 2005-08-11 Cagle Phillip C. Polymer colloid-containing ink-jet inks for printing on non-porous substrates
EP3012110A1 (fr) 2014-10-22 2016-04-27 Ricoh Company, Ltd. Appareil de formation d'images à jet d'encre
EP3034309A1 (fr) 2014-12-17 2016-06-22 Ricoh Company, Ltd. Appareil de formation d'image à jet d'encre et sécheur
DE102015204980A1 (de) * 2015-03-19 2016-09-22 Koenig & Bauer Ag Druckmaschine mit zumindest einem Selektivtrockner und ein Verfahren zur zumindest teilweisen Trocknung eines Bedruckstoffs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050176847A1 (en) * 2004-02-05 2005-08-11 Cagle Phillip C. Polymer colloid-containing ink-jet inks for printing on non-porous substrates
EP3012110A1 (fr) 2014-10-22 2016-04-27 Ricoh Company, Ltd. Appareil de formation d'images à jet d'encre
EP3034309A1 (fr) 2014-12-17 2016-06-22 Ricoh Company, Ltd. Appareil de formation d'image à jet d'encre et sécheur
DE102015204980A1 (de) * 2015-03-19 2016-09-22 Koenig & Bauer Ag Druckmaschine mit zumindest einem Selektivtrockner und ein Verfahren zur zumindest teilweisen Trocknung eines Bedruckstoffs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022086527A1 (fr) * 2020-10-22 2022-04-28 Hewlett-Packard Development Company, L.P. Modes d'impression avec retards de séchage

Also Published As

Publication number Publication date
DE102018210912A1 (de) 2020-01-09
CN110667263A (zh) 2020-01-10

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