DE102006007947A1 - Drying process for printed colors on a material uses irradiation for physical drying and to raise the temperature of a drying agent to aid chemical drying - Google Patents

Abstract

A drying process for colors printed on a material comprises printing the color and processing by irradiation (110) to accelerate physical drying. A drying agent (190) is used that predominantly produces the reaction requirements for chemical drying above a threshold temperature. This temperature is exceeded owing to the radiation and chemical drying accelerated. An independent claim is also included for a drying unit for the above process.

Description

The The present invention relates to a process for drying ink on a substrate according to the preamble of claim 1.

Of Furthermore, the present invention relates to a device for Drying of printing ink on a substrate according to the preamble of claim 14.

With Printing inked substrates often have to come before another Printing or other processing / processing by use dried by drying devices, since the printing ink, z. B. a conventional offset printing ink, physically and chemically dries too slowly. It is already known in this regard, inks using infrared or ultraviolet radiation as well as under Use of hot air to dry.

To the The purpose of accelerating the drying process is already there known, oxidatively drying printing ink additives, eg. B. siccative, admit. Lead higher Sikkativkonzentrationen on the one hand to a faster drying, this On the other hand, however, can also lead to undesirable color-building phenomena lead in the inking unit. alternative to add the additives in the ink, the additives can also be separated be applied directly to the substrate by the printing ink, whereby the risk of color buildup in the inking system is banned.

It is also already known that increased air exchange over the substrate surface through the discharge from drying reaction products to a faster oxidative Drying leads. This is usually done fan or electrostatic devices for destruction of a laminar boundary layer on the substrate surface (offered for example by the company Eltex in Weil am Rhein, Germany) used.

In the DE 102 34 076 A1 a device and a method for supplying radiant energy to a printing substrate is already described, wherein the radiant energy source used thereby essentially only emits light whose wavelength is non-resonant to absorption wavelengths of water. By adding an absorber substance in the ink, the absorption of the radiation energy, which is present for example in the form of infrared radiation, can be improved.

Furthermore, from the DE 103 16 471 A1 already a method for drying a printing ink on a substrate and a printing unit suitable for performing the method, wherein the substrate is illuminated with light from a laser light source having a wavelength in the visible spectral range and in resonance to an absorption wavelength of at least one color pigment contained anyway in the ink having. An addition of additional absorber substances in the ink is therefore not necessary.

Furthermore, from the DE 103 16 472 A1 also already known a method for drying a printing ink on a substrate, wherein the substrate is printed at a first position with ink and at a second position with a treatment agent which causes an acceleration of the drying of the ink is provided. In this case, the treatment agent may be applied in the form of a coating or a primer and the drying of the ink by the action of infrared radiation energy. It can be provided that the treatment agent comprises an infrared absorber, which is excited by the radiation energy and contributes to the drying of the printing ink.

In spite of the short-term strong increase in temperature of the ink by the Infrared radiation at some 100 ° C and the resulting improved drying of the ink can be the result Drying according to the respective teaching of the above three Publications unsatisfactory under certain conditions be, z. B. if already shortly after the printing of the color high abrasion resistance of the printed product is required.

The DE 101 49 009 A1 describes a method and apparatus for processing ink containing inhibitors wherein a catalyst mixture is used to accelerate the disintegration of the inhibitors and thus shorten the drying time. The catalyst mixture can be applied to the printing material via a printing cylinder or via a separate application device. The printing nip or the applicator is arranged downstream of a thermally acting dryer device.

In DE-OS 24 17 441 is a device for drying on on electrical poorly conducting substrates layered moist materials described, wherein for the heat-drying of For example, wet paint on paper used a corona discharge becomes.

Finally describes JP 11-58687 A a drying device for printing machines, wherein the Drying of printing paper uses an array of plasma torches becomes.

Also the use of a corona discharge or a plasma discharge can under certain conditions will not lead to the desired dry result, for example if the discharges are not due to very high production speeds enough long on the ink or the substrate can act.

It There is thus an interest in better drying concepts the production of printed products, so that the products for a rapid, possible direct processing sufficient are dried. There is also an interest in drying concepts, the one drying during the allow ongoing production, leaving soiling problems in the printing press by dropping the not enough dried paint can be avoided.

It is therefore an object of the present invention, a method and an apparatus for drying ink on a substrate to create, which make it possible, the Printing ink in a very short time and with only a small footprint for further edits to dry sufficiently.

These The object is achieved by a method having the features of the claim 1 and a device with the features of claim 14 solved.

Further versions The invention are contained in the subclaims.

One inventive method for drying printing ink on a printing substrate with the method steps Applying the ink to the substrate and treating the printing ink by irradiating in the way that a physical Drying of the ink takes place accelerates, stands out in that a drying assistant is used, which predominantly above a threshold temperature reaction promoter for a chemical Drying the ink provides, and that by the irradiation the threshold temperature of the drying assistant is exceeded and the chemical Drying of the ink is accelerated.

Under an accelerated drying is in this application to understand a drying, which compared to a without external support, for. B. by targeted irradiation, drying takes place faster expires and therefore in shorter Time leads to a satisfactory dry result.

A physical drying can z. B. by knocking off water, Solvents and / or Binder in the substrate or by evaporation of water, solvent and / or binders in the adjacent atmosphere. The physical Drying can be accelerated by increasing the temperature.

A Drying may, for. B. by a radical oxidative Polymerization done. The chemical drying can be done by increasing the number suitable reaction partners, for example, supported by Temperature increase, be accelerated. The running during the chemical drying Reaction may occur in the starting reactions (eg peroxide formation or Hydro-peroxide formation), the decomposition reactions (eg the Peroxidzerfall or hydro-peroxide decomposition), wherein the radicals required for the reaction arise, chain growth or chain scission and the termination reactions be divided. The course of the start reaction and the course of the Decay reaction can be through the use of catalysts or as Catalyst-acting siccatives, for example metal soaps organic Acids like Co (OOC-R) 2 or Mn (OOC-R) 2.

The Drying of the ink, physically and / or chemically, leads at the same time to a hardening or to a curing the printing ink. Because the hardening according to the invention Irradiation is accelerated, the drying process can also be called a radiation hardening be understood.

Under a drying assistant is in this application a chemical Substance understood above one for the drying excipient characteristic temperature itself, especially in excited Condition, as a reaction promoter the supports chemical drying of ink or provides the reaction promoter, which support the chemical drying of printing ink.

The for the Drying excipient characteristic temperature is below referred to as threshold temperature, wherein the number of reaction promoters when exceeded or above the threshold temperature increases sharply, so that the reaction promoter predominantly or in for the accelerated drying process sufficient number above the Threshold temperature arise. Instead of the name reaction promoter can Therefore, the term reaction accelerator can be used. The term reaction initiator lends itself, if the chemical Reaction of the drying process started by the reaction promoter becomes.

If the drying assistant comprises a chemical substance which increases when the temperature increases and in particular when a Grenztem temperature, for example, the above-mentioned threshold temperature, increasingly provides reaction promoter, so that their number sufficient for accelerated drying, this substance is also referred to in this application as a thermoinitiator molecule. A thermoinitiator molecules thus acts as a kind of thermal switch, the z. B. the threshold temperature is effective and provides reaction conveyor, while the number of provided reaction conveyor is negligible below the threshold temperature for the accelerated drying.

When Drying excipient are therefore z. B. substances used, the only above about 60 ° C or above even higher Temperatures, z. B. above about 200 ° C, be effective. In this way can also higher Concentrations of the drying assistant used as an additive in the printing ink be without any unwanted color buildup to fear in the inking unit is.

Possible as Thermal initiator molecules active substances are iron siccatives (eg Octa-Soligen iron, which only above about 130 ° C its Unfolded by the company Borchers GmbH in Langenfeld, Germany can be purchased), Strontiumsikkative or Mangansikkative.

Further possible as thermoinitiator molecules acting substances are peroxides, as these increase in temperature over a Threshold temperature easily decay and split off oxygen or Form radicals, for. B. dibenzoyl peroxide (threshold temperature at about 70 ° C), methyl ethyl ketone peroxide (threshold temperature at about 80 ° C), Cyclohexanone peroxide (threshold temperature at about 90 ° C) and cumene hydroperoxide (Threshold temperature at about 100 ° C).

Also possible as thermoinitiator molecules acting substances are amines, z. B. mono-, di- or trialkylamines (Ethylamine, diethylamine, triethylamine), polyamines (ethylenediamine, Phenylenediamine, tetraaminoethylene) or α-aminoketones. Furthermore monoethanolamines, Dimethylethanolamine, diethanolamine or triethanolamine, which at temperatures above about 200 ° C up to 250 ° C to reaction promoters begin to crumble.

Of the Drying excipient may in particular of the printing ink as such be different, z. B. the ink may be added as an additive. The drying excipient can also be one of a purely thermal acting substance, d. H. from an externally heated by energy supply and heat donating substance, various drying excipient. Furthermore, the Drying aid from an inhibitor, in particular from a solid or liquid Inhibitor may be various adjuvant.

According to the invention supports the Irradiation of both the physical and the chemical, by a drying excipient support drying, so that in an advantageous Overall, an improved, d. H. especially one accelerates ongoing drying can be achieved and a further processing enables Direction Dry state in a short time and using only less, the Drying serving units is achieved.

According to one preferred embodiment of inventive method irradiation takes place using the action of infrared radiation.

According to one another preferred embodiment the method according to the invention the irradiation is carried out using the action of at least one Laser unit, in particular using the action of an infrared laser radiation.

According to two further preferred embodiments the method according to the invention irradiation takes place with complementary use of the effect at least one corona discharge unit or under supplementary Use of the effect of at least one plasma discharge unit, in particular under the supplementary Use of a low-temperature atmospheric pressure plasma. It can also also be provided, the two embodiments of the method to combine and both the complementary use of the effect a corona discharge unit as well as the complementary use of the effect to provide a plasma discharge unit.

Of the Use of an atmospheric pressure plasma is advantageous because the substrate by the irradiation, d. H. by the bombardment with the plasma particles, not strongly heated, since the plasma itself has a temperature of only about 300 ° C.

Provided a corona discharge unit or a plasma discharge unit is used, this can advantageously on the the substrate opposite Side disposed counter electrode, so that the charged particles purposefully accelerated towards the printing material.

Both the corona discharge unit and the plasma discharge unit, or their respective particle beams, advantageously support the drying process by improving the provision of reaction promoters by the drying assistant, ie the number of Re Action conveyors for the drying process is increased by the complementary use compared to the number of reaction conveyors without additional use so that the drying time is significantly reduced until reaching a dry processing processing enabling further processing.

A advantageous in terms of accelerated drying of the ink Embodiment of the inventive method provides that on the one hand, the effect of infrared radiation and the other the effect of the corona discharge unit and / or the effect the plasma discharge unit substantially the same area of Capture substrate. In this way, it can be ensured that both the heat energy of the Infrared radiation as well as the introduced energy of the radiation the corona discharge unit and / or the plasma discharge unit essentially at the same time and in the same place to disposal stand, so that the irradiation in terms of dry time optimally complete. Advantageously, thus stand for the physical drying enough Heat and for the chemical Drying enough Heat and reaction promoter to disposal.

The in the above-mentioned inventive method, or in his advantageous embodiments used printing ink can be a solid and / or liquid drying assistant contain.

A further or alternative embodiment the method according to the invention can be characterized in that the printing ink of an atmosphere with a gaseous Drying excipient is exposed.

The both latter embodiments distinguish or supplement by the manner in which the drying aid is provided is: either in the color or in the atmosphere, which to the substrate and thus the ink adjoins. However, both embodiments provide sure that the drying aid is at least on the surface of the Printing ink or the ink layer is available and that one for further processing sufficient drying of at least the surface can be achieved.

A further or alternative embodiment the method according to the invention may be determined by the drying aid being a 2-component system forms, with one component in the ink and the other component in the atmosphere, which is exposed to the ink is provided. A 2-component system offers the advantage that only at the meeting of the two components drying takes place, causing premature drying of the ink and thereby caused problems, eg. B. Color structure in the printing unit, can be avoided in an advantageous manner.

Complementary or Alternatively to the above-described provision of a drying assistant in the Printing ink can according to two further embodiments provided the method according to the invention be that on the one hand to the substrate a primer and the Others on the substrate and / or on the ink a coating is applied, which in each case comprises a solid and / or liquid drying aid. moreover it is in a further embodiment the invention possible to provide a primer and a coating in combination. These embodiments help through too early incipient drying caused problems to be avoided.

Of the Drying assistant may, according to a preferred execution the method according to the invention go above the threshold temperature in an excited state. In a particularly preferred in terms of accelerated drying execution has the inventive method the reaction promoter ozone provided by the drying aid, Ions and / or radicals.

A further execution of the method according to the invention, which opposite the previously mentioned method to a further accelerated Drying leads, provides that the reaction products of chemical drying are removed.

A inventive device for drying printing ink on a printing substrate, wherein the device an irradiation unit is characterized in that the irradiation unit on the one hand a unit for generating electromagnetic Radiation for the accelerated physical drying and secondly a unit for generating charged particle radiation for the accelerated chemical, having drying assisted by a drying assistant.

at the device according to the invention in particular, it is one of one only a UV unit or only a hot air unit having Dryer different device.

Preferably, the unit for generating electromagnetic radiation and the unit for generating radiation of charged particles are arranged and / or aligned such that their respective radiation at the same time the same area of Be to meet printing material.

According to the invention for the accelerated drying two units, one unit of production electromagnetic radiation and a unit for generating Radiation of charged particles, available, which in advantageous Way the desired, a further processing enabling Dry result even under extreme conditions, eg. B. under maximum Production speeds can be achieved. The two together complement the units used doing so in such a way that both for the accelerated physical drying the required heat energy as also for the chemical drying the required heat energy and the needed high number of reaction conveyors ready. Since the chemical drying at the same time by means of Unit for generating electromagnetic radiation at least with heat energy and by means of the unit for generating radiation charged Particles supplied at least sufficiently with reaction promoters is, it comes in an advantageous manner to a synergy effect, the causes that the dry reactions run faster than with single use of the respective units.

According to one particularly preferred embodiment the device according to the invention the irradiation unit on the one hand a laser unit and the another corona discharge unit and / or a plasma discharge unit on.

The Invention as well as other advantages of the invention will become apparent below with reference to the drawings based on preferred embodiments described in more detail. The drawings show:

1 - 3 Flowcharts of respective embodiments of the method according to the invention; and

4 Embodiment of a device according to the invention.

1 shows a flowchart of a first embodiment of the method according to the invention. In one process step 100 is a lithographic fluid, such. As a printing ink or a paint on a substrate, such. As paper, cardboard or foil as sheet or web, applied, wherein the liquid (referred to in this application without limitation as an ink) preferably in a printing process, such as. B. the wet or dry offset on the substrate is brought. As a result, a color layer forms on the substrate.

According to the invention, a printing ink is used which is provided by provision 190 a drying assistant for the subsequent drying in a special way is suitable or prepared. The drying assistant can on the one hand the ink already in their production, on the other hand, but also in a separate, the process step 100 previous procedural step added, z. B. be mixed. The drying assistant may be solid or liquid.

In one process step 110 the printing substrate, or at least the printing ink on the printing substrate, is exposed or subjected to irradiation, wherein the use of the effect of the radiation specifically leads to a physical drying of the printing ink caused by the temperature increase compared with the unsupported drying.

The irradiation 110 may preferably be accomplished using infrared radiation (about 700 nanometers to 3000 nanometers). In the embodiment according to the 1 is provided for this purpose, the ink a few milliseconds (0.01 ms to 10 s, or 0.1 ms to 100 ms, or preferably 1 ms to 10 ms) of an infrared irradiation 112 suspend or undergo, which is preferably generated by a laser unit and directed or guided on the ink. The wavelength of the radiation is preferably in the range from 700 to 3000 nanometers, in particular at 700 to 2500 nm or at 800 to 1300 nm.

According to the invention by the irradiation 110 short-term causes a desired increase in temperature of the ink and thereby exceeded a threshold temperature of the drying aid used, with reaction promoters are provided mainly above the threshold temperature for a targeted chemical drying of the ink. The short-term increase in temperature of the ink or ink layer is preferably in the range of 50 to 1000 ° C, in particular in the range of 200 to 350 ° C or from 50 to 350 ° C, and the threshold temperature at about 50 to 1000 ° C, especially at about 50 to 200 ° C.

The provision of reaction conveyors can be done in various ways. On the one hand, the drying excipient can go into an excited state, which itself causes the targeted chemical drying as a reaction promoter. On the other hand, the drying assistant Thermoinitiatormoleküle, ie thermally sensitive molecules include, which, for. B. disintegrate under the action of infrared light, predominantly above the threshold temperature and reaction promoter, for example in the form of radicals for a chemical reaction, in particular a radical polymerization be riding set. In general, ozone and / or ions are possible as reaction promoters other than radicals.

When Drying excipient, or as Thermoinitiatormolekül, can preferably a readily cleavable in the radical substance in the ink be introduced. So can for example, peroxides, hydroxyl groups, ketone groups, amino groups, acid groups and / or generally unsaturated Compounds that are in oxygenated or nitrogenous Free radicals, in the printing ink or in components the printing ink (for example in a binder of the printing ink) be introduced. Since peroxides decompose easily at higher temperatures, These offer themselves as thermoinitiator molecules.

Farther it is advantageous to use binder combinations as a drying assistant, such as these today for baking enamels for radical high temperature polymerization can be used because of the laser irradiation a short strong temperature increase of Printing ink is done. Such paints exist, for example, on Alcyd, Polyester, acrylic or epoxy resin base for threshold temperatures of about 100 to 150 ° C.

Furthermore the use of siccatives as a drying additive is advantageous, which is essentially drying above the threshold temperature develop positively influencing effect. Such siccatives can be found in high concentrations are used without risk of running that it to an undesirable Color structure in the inking comes, because only by the irradiation and the heat generated thereby, z. B. over about 50 ° C, one Activation of the siccatives takes place (one can therefore use thermo-siccatives speak). Are suitable in an advantageous manner, for. B. Cer-siccatives.

In one process step 120 it can be provided that the reaction products of the chemical drying, z. Example, using a suction or blowing device, a directed air flow and / or an electrostatic device to destroy laminar boundary layers are removed, so that the chemical / -n reaction / -en can proceed largely undisturbed. In this way, an improved air exchange is brought about and the chemical equilibrium is influenced so positively that the drying accelerates or at least proceeds without braking. Of particular importance is the measure of the air exchange in the case of short time window for drying or heating, ie in particular at high production speeds, as would otherwise be set with reaction products heavily loaded atmosphere near the substrate.

The irradiation 110 can in addition to infrared irradiation 112 one or more complementary treatments, in particular radiation treatments. Thus, preferably a treatment or irradiation 114 with the complementary use of the effect of at least one corona discharge unit. In other words, a supplementary corona discharge treatment or irradiation of the printing ink can take place. However, it may also preferably be a treatment or irradiation 116 with the complementary use of the effect of at least one plasma discharge unit. In other words, a supplementary plasma discharge treatment or irradiation of the printing ink can take place.

Especially preferred is the complementary use an atmospheric pressure plasma or a normal pressure plasma, in particular a low-temperature atmospheric pressure plasma, being the distance of a plasma nozzle of the printing substrate preferably between about 1 and 100 millimeters, more preferably between about 10 and 50 millimeters.

The drying effect of the irradiation 110 In one area of the printing substrate, this area can be further increased by detecting this area on the one hand by the effect of the infrared radiation and on the other hand by the effect of the corona discharge unit and / or by the action of the plasma discharge unit. In other words, this means that preferably both the infrared radiation and the corona discharge radiation and / or the plasma discharge radiation are directed onto the same area of the printing ink and thus act at the same place at the same time.

By the treatment or irradiation of at least the surface layer the ink using the corona discharge unit and / or the plasma discharge unit can advantageously ionization or radical formation of molecules the components of the ink, of fission products of a starting oxidative drying and / or caused by evaporated components, whereby reaction promoter for the Drying be provided. Of particular advantage is the treatment of the reaction products of oxidative drying through the use of the corona discharge unit and / or the plasma discharge unit, so that the reaction products decompose and the chemical balance in favor of an accelerated drying is affected. In this way it comes with advantage to a drying effect accelerating combination effect the use of the laser unit and the use of the corona discharge unit or the plasma discharge unit. The simultaneous ruling of high temperatures and presence of a sufficient number of reaction promoters leads according to the invention to a quick and satisfactory drying.

2 shows a flowchart of a second embodiment of the method according to the invention.

Comparable to the step 100 in 1 is here in a procedural step 200 Printing ink applied to a Bedruckolf, in particular printed in the form of a printed image.

Also comparable to the process step 110 in 1 is here in a procedural step 210 the substrate and thus the ink irradiated, resulting in an accelerated physical drying of the ink. The irradiation may preferably be with infrared radiation 212 take place, again infrared laser radiation is particularly preferred.

In contrast to the embodiment of the 1 Here, the drying excipient is not already provided in the ink, but is fed to the atmosphere or generated in the atmosphere surrounding the substrate in the range of the ink to be dried. The drying assistant is therefore preferably gaseous, for example, it is oxygen in relation to the concentration of air-oxygen increased concentration. For this purpose, it can preferably be provided to provide or generate an ozone, ion and / or radical-containing atmosphere, at least in the irradiated area of the printing substrate. In this case, the provision or generation of ozone, ions and / or radicals by the irradiation of the atmosphere or the gases in the atmosphere can be done with laser light.

By the irradiation 210 a threshold temperature of the drying assistant is exceeded, so that there is an increased formation of reaction promoters for a chemical drying of the ink.

Again comparable to process step 120 in 1 can in one process step 220 the removal of reaction products of the chemical drying may be provided.

Also in the in 2 shown embodiment of the invention may as in 1 in addition to infrared radiation 212 (or in other words: infrared drying) one or more complementary treatments or irradiations be provided, wherein also the effect 214 at least one corona discharge unit and / or the effect 216 at least one plasma discharge unit is used, that is used.

By the treatment of the substrate surrounding and irradiated, in particular IR-irradiated the atmosphere (Ambient air or defined atmosphere) with a plasma or a Corona discharge creates an increased number of z. Ozone, Ions and / or radicals, which oxidative drying positive influence. That way you can z. As nitrogen and / or oxygen radicals quickly and in sufficient Amount for an accelerated drying can be provided.

3 shows a flowchart of a third embodiment of the method according to the invention.

Unlike the procedure in 1 Here, the drying excipient is not supplied together with the ink, but brought separately to the substrate. This can be done either by a primer or a coating.

In 3 is the provision of the drying assistant 390 presented in two ways. Either the drying assistant is before printing 300 applied as primer to the substrate or the drying assistant is after printing 300 applied as a coating on the printed substrate. The drying assistant is preferably provided in solid or liquid form.

The irradiation 310 , in particular the infrared radiation 312 , as well as the additional complementary treatments or irradiations 314 with the radiation of a corona discharge and / or 316 with the radiation of a plasma discharge, and the removal of reaction products 320 correspond to the illustration and description to 1 ,

4 shows an embodiment of a device according to the invention 500 ,

The device 500 for drying printing ink on a substrate 502 is in the direction of movement 504 of the printing material 502 , z. As a paper or cardboard sheet, according to, in particular immediately after a first printing unit 506 arranged, which the printing ink on the substrate 502 applying.

The device 500 has an irradiation unit 508 on, which in turn is a unit 510 for generating electromagnetic radiation, in this case an infrared laser unit, and a unit 512 for generating charged particle radiation, in this case a plasma discharge unit. As an alternative or in addition to the plasma discharge unit, it is also possible to provide a corona discharge unit. The plasma discharge unit preferably generates a low-temperature plasma, so that an undesired and damaging effect on the printing material or the printing ink heating can be advantageously avoided.

The unit 510 Primarily used for physical drying and the unit 512 primarily chemical drying, the chemical drying being assisted by an existing drying assistant. The unit 510 however, it also supports chemical drying.

Further shows 4 one unity 514 for removing reaction products of chemical drying, in this case a blower. Alternatively or additionally, it is also possible to provide a suction device or an electrostatically acting device for destroying laminar boundary layers.

The auxiliary drying assistant can, as described above in the reference to 1 described method, already contained in the printing ink or he can have one in front of the printing unit 506 arranged primer unit 516 or one after the printing unit 506 arranged coating unit 518 (Both configured in this example as spraying devices) are applied to the substrate (this procedure corresponds to the above with reference to 3 described method).

Alternatively, the device 500 also an encapsulation 522 in which an atmosphere is contained, to which the drying assistant is supplied or in which the drying assistant is produced (this procedure corresponds to that described above with reference to 2 described method).

The device 500 can, as in 4 shown in front of another printing unit 520 be arranged. In other words, the device can 500 Space-saving between two printing units of a printing material processing machine, in particular a printing press, are arranged. Alternatively, the device 500 even after the last printing unit of a number of printing units are arranged. However, the arrangement of a device is preferred 500 after each printing unit, so that the ink applied by the printing unit is already dried sufficiently or even completely before the printing material enters a further printing unit or a printing finishing device.

100 200, 300

Instruct the printing ink

110 210, 310

radiotherapy the printing ink

112 212, 312

 Infrared radiation the printing ink

114 214, 314

Corona discharge irradiation of printing ink

116 216, 316

Plasma discharge irradiation of printing ink

120 220, 320

Discharge from reaction products

190 290, 390

Provide of the drying assistant

500

contraption to dry

502

substrate

 504

movement direction

506

1. printing unit

508

Irradiation unit

510

Laser unit

512

Plasma discharge unit / corona discharge unit

514

fan

516

Primer unit

518

Coating unit

520

additional printing unit

522

encapsulation

Claims (15)

Process for drying printing ink on a printing substrate with the following process steps: - application ( 100 . 200 . 300 ) of the printing ink on the printing substrate ( 502 ), and - Treating ( 110 . 210 . 310 ) of the printing ink by irradiation ( 112 . 212 . 312 ) in such a way that a physical drying of the printing ink takes place at an accelerated rate, characterized in that - a drying assistant is used which provides reaction promoter for a chemical drying of the paint predominantly above a threshold temperature, and - that by the irradiation ( 112 . 212 . 312 ) the threshold temperature of the drying assistant is exceeded and the chemical drying of the ink takes place accelerated. Method according to claim 1, characterized in that the irradiation ( 110 . 210 . 310 ) using the action of an infrared radiation ( 112 . 212 . 312 ) he follows. Method according to claim 1, characterized in that the irradiation ( 110 . 210 . 310 ) using the action of at least one laser unit, in particular using the action of an infrared laser radiation ( 112 . 212 . 312 ), he follows. Method according to claim 1, characterized in that the irradiation ( 110 . 210 . 310 ) with complementary use ( 114 . 214 . 314 ) the action of at least one corona discharge unit ( 512 ) he follows. Method according to claim 1, characterized in that the irradiation ( 110 . 210 . 310 ) with complementary use ( 116 . 216 . 316 ) the action of at least one plasma discharge unit ( 512 ), in particular with the additional use of a low-temperature atmospheric pressure plasma. Method according to one of claims 4 or 5, characterized in that on the one hand the effect ( 112 . 212 . 312 ) of the infrared radiation and on the other hand the effect ( 114 . 214 . 314 ) of the corona discharge unit ( 512 ) and / or the effect ( 116 . 216 . 316 ) of the plasma discharge unit ( 512 ) capture substantially the same area of the substrate. Method according to claim 1, characterized in that that in the printing ink, a solid and / or liquid drying assistant is provided. Method according to claim 1, characterized in that that the ink of an atmosphere with a gaseous drying excipient is suspended. Method according to claim 1, characterized in that that the drying assistant forms a 2-component system, one component in the ink and the other component in the atmosphere, which is exposed to the ink is provided. Method according to claim 1, characterized in that the drying assistant above the threshold temperature in one excited state passes. Method according to claim 1, characterized in that the drying assistant comprises thermoinitiator molecules. Method according to claim 1, characterized in that that the reaction promoter Ozone, ions and / or radicals. Method according to claim 1, characterized in that that reaction products of chemical drying are removed. Device for drying printing ink on a printing substrate, the device comprising an irradiation unit ( 508 ), characterized in that the irradiation unit ( 508 ) on the one hand a unit ( 510 ) for generating electromagnetic radiation for accelerated physical drying and, secondly, a unit ( 512 ) for generating charged particle radiation for the accelerated drying assisted by a drying assistant. Apparatus according to claim 16, characterized in that the irradiation unit ( 508 ) on the one hand a laser unit ( 510 ) and on the other hand a corona discharge unit ( 512 ) and / or a plasma discharge unit ( 512 ) having.