EP3439884B1 - Système et procédé pour fournir de l'encre depuis plusieurs sources à une machine d'impression - Google Patents

Système et procédé pour fournir de l'encre depuis plusieurs sources à une machine d'impression Download PDF

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Publication number
EP3439884B1
EP3439884B1 EP17718338.1A EP17718338A EP3439884B1 EP 3439884 B1 EP3439884 B1 EP 3439884B1 EP 17718338 A EP17718338 A EP 17718338A EP 3439884 B1 EP3439884 B1 EP 3439884B1
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EP
European Patent Office
Prior art keywords
ink
printing
amount
main circuit
inking roller
Prior art date
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EP17718338.1A
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German (de)
English (en)
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EP3439884C0 (fr
EP3439884A1 (fr
Inventor
Federico D'annunzio
Ludovico FRATI
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Bobst Firenze SRL
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Bobst Firenze SRL
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/005—Ink viscosity control means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/002—Heating or cooling of ink or ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/06—Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders
    • B41F31/07—Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders for rotogravure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/08—Ducts, containers, supply or metering devices with ink ejecting means, e.g. pumps, nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/20—Ink-removing or collecting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2231/00—Inking devices; Recovering printing ink
    • B41P2231/20—Recovering printing ink
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2251/00—Details or accessories of printing machines not otherwise provided for
    • B41P2251/10—Pumps

Definitions

  • the present invention concerns a system for the on-board ink management, mainly directed to flexographic or rotogravure printing machines.
  • the system according to the invention achieves the feeding of the ink in an ink supplying module of the printing machine and also controls the adjustment of the printing parameters.
  • flexographic and rotogravure printing machines comprise a roller unit with two mutually tangent and counter-rotating rollers that make for the transfer of the ink to a printing support.
  • the inking roller transfers the ink (directly, in the case of rotogravure printing, or indirectly via a further roller, in the case of flexographic printing) to the printing support, held by a counter-pressure roller.
  • EP 2,985,150 discloses a system that corrects the ink composition in a press based on the result of a measurement of the printed support.
  • the inking system uses two sets of ink and two mixing system. Each mixing system has a plurality of ink sources. The first set is used to produce the base ink, the second set (and second mixer) is used to correct the base ink based on the measurement of a printed patch.
  • One drawback of the system is the complexity.
  • Another drawback is the reaction time.
  • the system lacks the elements to correct the printed output promptly: It can only add ink.
  • the corrected ink is not in direct contact with the printing roller (it is presented as an ink dispensing unit), and thus, it has to wait until some old ink is consumed before the corrected ink is used.
  • to control the temperature the whole volume of ink is heated, which is slow, and the system cannot be used to cool the ink if the temperature happens to be temporarily too high.
  • US 2015/0210060 discloses an inking system with a recirculation circuit which compensates for the evaporation of the solvent in real time.
  • the system is meant to be refilled with ink at the end of each printing job and is not suitable for an in-line adaptation of the printing parameters.
  • WO 03/047865 discloses a system which mixes ink from several sources into an intermediate colour tank. The ink is then circulated from the tank to a color deck of a printing unit and back. The ink mixture is adjusted continuously based on a spectral measurement of the printed colour and a comparison with its expected value.
  • the use of an intermediate tank increases the time that a corrected mixture needs to reach the print because of the large amount of ink involved in the process. This increase of time slows down the colour adjustments process.
  • WO 2009/071133 is similar to the above-mentioned invention ( WO 03/047865 ) but splits the ink sources into two groups.
  • the first group is a decentralized mixing device with 11 inks which fills a (local) ink bucket with the desired mixture, which is then poured into the intermediate colour tank.
  • the second group uses 3 inks and is used to pour corrective ink into the intermediate colour tank.
  • the rest of the inking system is identical to WO 03/047865 , and suffers from the same dynamic drawbacks.
  • US 2015/0210060 discloses an inking system configured to add and maintain the solvent ratio of the ink used for printing. It also discloses an ink outlet to pump the ink into a recovery tank to purge the ink from the inking system.
  • An object of the present invention is therefore to provide a system for the on-board ink management, that is a system capable of effectively controlling the ink feeding in an ink supplying module of the printing machine and moreover of adjusting the printing parameters.
  • a further object of the present invention is to provide a system that permits to vary the composition of the processed ink, for example the amount of pigment contained therein, and obtaining a variation of the printing parameters such as the Lab colorimetric parameters and the colour density that can be detected on the image transferred to the printing support.
  • FIG 1 shows schematically and in functional terms the system according to the invention.
  • figure 1 shows schematically and in functional terms the system according to the invention, installed on a printing unit of a flexographic or rotogravure printing machine.
  • the printing machine comprises an inking roller 1 and a counter-pressure roller 20.
  • the inking roller 1 may be an anilox roller in a flexographic printing machine or the gravure cylinder, i.e. the cylinder comprising the pattern to print, in a rotogravure printing machine.
  • the inking roller 1 is in direct contact with an ink supplying module 3 (such as a tank and doctor blade unit with a closed chamber or an open tray, or any other type known in the art) and transfers the ink to a printing support 4, held by the counter-pressure roller 20.
  • an ink supplying module 3 such as a tank and doctor blade unit with a closed chamber or an open tray, or any other type known in the art
  • the figure represents specifically a layout of a flexographic printing unit, and in this case, also a third roller 21 is shown, that in the flexographic machine has the function of supporting a printing plate. In rotogravure printing machines only the inking roller and the counter-pressure roller are instead present.
  • the ink supplying module 3 is connected with a main feeding circuit 50 through which a recirculation of the ink is carried out between an outlet 30 and an inlet 31 of the ink supplying module 3. Let's call the assembly made of the main feeding circuit and the (connected) ink supplying module the "main circuit" 5.
  • the main circuit 5 via the provision of circulation forcing means 51, such as a pump, allows for a forced flow of the ink from the outlet 30 towards the inlet of the ink supplying module 3.
  • the main circuit Downstream of the circulation pump 51, but upstream of the inlet 31, the main circuit is connected with ink refill device 6 for providing an additional amount of ink to the main circuit 5.
  • the refill device 6, described in further detail hereafter, is logically controlled by control means 7, adapted to detect a measured value of printing parameters on the printing support, and to compare said measured value with the desired value of such parameters; accordingly, if thus measured value does not match the desired value, the control means 7 activate the refill device 6 to provide the main circuit with the additional amount of ink.
  • the main circuit 5 may preferably contain as little ink as possible, and thus an ink supplying module 3 with a closed chamber and two blades is preferred to a solution using an open tray.
  • an ink supplying module 3 with a closed chamber and two blades is preferred to a solution using an open tray.
  • the reaction time of the system two options are proposed: the first uses an ink outlet 9, and the second varies the temperature of the inking roller 1. Both options can be used independently or in combination.
  • a printed colour channel has typically 10% ink coverage, representing approximately 0.11 gramme per square meter of ink coverage.
  • ink coverage representing approximately 0.11 gramme per square meter of ink coverage.
  • the total amount of ink in the main circuit is 0.6 litres. In other words, it takes one hour for the press to use 100% of the ink present in the main circuit 5.
  • the refill device 6 may add an additional amount of ink to the main circuit 5, while the ink outlet 9 may remove a second amount of ink from the main circuit 5, resulting in a replacement of a given percentage of the ink.
  • the additional amount of ink added is equal to the second amount of ink removed (for the sake of simplicity of this disclosure, we disregard here the fact that in a normal running situation there is a given flow of additional supplementary ink that is added to the main circuit 5 by the refill device 6 to compensate for the consumption of the printing machine, said consumption being the flow of ink transferred to the printing support; thus the amount of ink removed might be slightly smaller than the amount of ink added).
  • the refill of the ink by the refill device 6 occurs simultaneously to the removal of the ink by the ink outlet 9. Thanks to this last characteristics, the main circuit does not need to have means to handle large volume variations of ink.
  • the ink outlet is positioned on the main circuit 5 such that when corrective ink is added to the circuit, the ink removed with the outlet 9 is old ink (and not a mixture of old ink and corrective ink).
  • the ink outlet 9 is positioned upstream from the ink refill device 6, which is positioned upstream from the ink supplying module 3, which is positioned upstream from the ink outlet 9, etc.
  • the ink amount in the main circuit 5 between the ink outlet 9 and the ink refill device 6 is kept to a minimum compared to the total amount of ink in the main circuit, thus placing the ink outlet 9 just before the ink refill device 6 (according to the ink flow).
  • the ink is collected in a collection reservoir 63.
  • the collected ink has a known characteristic and thus can be adjusted by adding some pigments or by adding some solvent in order to match the characteristics of the ink present in one of the tanks 62. Then, the collected ink can be reused in said tank.
  • the ink characteristics are measured offline in an ad hoc place, adjusted, and used to refill one of the tanks 62.
  • the ink outlet can either be an active device (preferably), comprising a valve and/or a pump which can be activated by the control means 7, or a passive device. It can also be a flux deviator.
  • the outlet can be a device that regulates the amount of ink present in the main circuit 5, for example by keeping the volume constant.
  • This constant volume function can be implemented as an overflow reservoir, which removes ink whenever the ink pressure exceeds a given threshold (the overflow reservoir can be a passive device, i.e. not connected to the control means 7).
  • the overflow reservoir 9 removes that same amount of ink from the main circuit, leading to a simple system.
  • the refill device 6 are connected with two or more auxiliary tanks 62 each containing ink with a higher or lower amount of pigment with respect to the ink in the ink supplying module, or ink with a different type of pigment. It is also possible to have an embodiment with one or several tanks 62 containing ink with a higher amount of pigment compared to the ink in the ink supplying module and have a tank 62 filled solely with solvent (the solvent may be water for water-soluble inks).
  • the tanks 62 can be any receptacles suitable for storing liquids.
  • the refill device 6 comprises a pump 61 connected to two or more tanks 62, as depicted in the figure.
  • the pump 61 in response to a determined input signal from the control means 7, selectively draws a certain selected amount of ink from either tank to which the same pump is associated, and directs such amount as an extra amount of ink to the main circuit.
  • the pump 61 can be provided with a switching valve (not shown), to selectively clear or block the hydraulic connection of the pump with either tank.
  • the refill device 6 comprises more than one pump, and namely a pump for each tank 62.
  • the control means 7 may activate only the pump of the selected tank, to draw a determined amount of ink and direct such amount as an additional ink amount to the main circuit.
  • the control means may activate each pump simultaneously, by selecting the appropriate duration and/or flow for each pump to reach the desired ink mixture.
  • the refill with the extra amount of ink can occur at a single junction point of the main circuit (as in the depicted example where the junction point is indicated by the reference character P), or at plurality of different junction points, e.g. a junction point for each pump when the refill device 6 comprises more than one pump.
  • a correct mixing of the extra amount of ink with the flow circulating in the main circuit is carried out through mixing means 8 arranged in the main circuit, downstream of the refill junction point P.
  • the mixing means comprise e.g. a static mixer 8.
  • the ink in the main circuit is circulated at a higher speed than the flow of the ink determined by the ink consumption of the printing machine, thanks to the pump 51.
  • the ink passes on average several times through the mixer 8 before reaching the printed support.
  • the ink flow speed is set to at least 10 times said consumption speed.
  • the pump 51 can be placed anywhere on the main circuit, but preferably just before the inlet P for the corrective ink.
  • Circulating the ink in the main circuit at high speed is important in some cases. It reduces the time needed for the ink mixture (after addition/replacement by the corrective ink) to reach the support. It also reduces the time needed for obtaining a well-mixed adjusted ink (even in the absence of the mixer 8) in the case when the corrective ink does not replace the old ink completely (but is mixed with it).
  • the addition of an extra amount of ink can be programmed to last the average time that the ink needs to circulate once through the main circuit. This last trick prevents the output characteristics to oscillate between the characteristics of the old ink present in the main circuit before the correction and the characteristics of the corrective ink.
  • the oscillation might happen if there is a section of the main circuit filled with corrective ink and another section of the circuit filled with old ink provided that these sections have not been mixed yet.
  • adding ink in this way requires the knowledge of the total amount of ink in the circuit, which may be difficult to monitor over time, and requires an ad hoc sensor, for example, one or two flow sensors 72.
  • a simple method to perform the correction consists in replacing the old ink by corrective ink (i.e. the adjusted ink is the corrective ink), by providing the corrective ink while fully opening the ink outlet 9, until the print parameters recorded by sensor 71 match the specifications. Once the specifications are met, the circuit is closed, and the printing continues as normal.
  • the recirculation speed of the ink in the circuit 5 is less critical, since it does not involve mixing corrective ink with old ink (except for mixing the residue of the old ink).
  • these comprise an electronic controller 70 to which a sensor 71 is logically connected, for detecting the printing parameters such as the Lab colorimetric parameters and density, or the reflection spectrum, or the ink coverage, or any combination of these parameters, directly on the printing support.
  • the sensor 71 can be for example a spectrophotometer, a colour camera, or a high-resolution camera.
  • the spectrophotometer measures the spectrum (from which the Lab colorimetric parameters and density can be extracted), the colour camera measures density and Lab colorimetric parameters, and the high-resolution camera can measure, in addition to colour and density, the ink coverage, i.e. the percentage of the support area covered by the individual halftone dots.
  • the electronic controller 70 activates the refill device 6 so as to make it draw the desired extra amount of ink from a chosen tank 62 and have it mixed with the ink circulating in the main circuit.
  • the electronic controller 70 may activate the heating means so as to reach a target temperature that results in the desired ink viscosity.
  • the electronic controller 70 activates the ink outlet device to accelerate the replacement of the old ink by the adjusted ink. In extreme situations, the ink outlet device can be used to replace the old ink by the corrective ink completely.
  • the mixing with an additional ink having a pigment of a different type affects the (optical) density of the ink as well as its viscosity.
  • using ink with an increased amount of pigments thus a more viscous ink, reduces the quantity of ink that the inking system transfers to the support, potentially reducing the printed density.
  • having more pigment in the ink increases the printed density.
  • the viscosity might even vary according to the opposite trend (or not at all) with the pigment density. The overall result of these two phenomena depends on the situation, in particular on the ink characteristics, the solvent characteristics and the current viscosity. When heating the inking roller, the viscosity of the ink decreases (i.e.
  • the control system 7 does not necessarily need to know beforehand the exact behaviour of the inking system to perform the control (even if it might help). It may use any adaptive control technique known in the art to perform the correction. Adaptive control techniques estimate the dynamic behaviour of the printing system using measured data over time.
  • a solution to keep the effect of the corrective ink simpler is by controlling the temperature of the inking roller for keeping the viscosity of the ink constant, and independent of the pigment density. This is possible within the range of temperatures that are acceptable according to the ink and support specifications.
  • a further sensor 72 can be provided in the main circuit upstream of the refill junction point P where the additional amount is received, and downstream from the ink supplying module 3. This is a flow rate sensor for detecting the flow rate circulating in the main circuit and transmitting the measured data to the controller 70 so that the control means can set the appropriate amount and rate of extra ink to be mixed with the flow that is already circulating.
  • the system according to the invention can be thus further detailed as follows.
  • the machine, and therefore the ink supplying module contains a certain ink, with a defined amount and type of pigment.
  • the sensor 71 detects the printing parameters, for example, the Lab colorimetric parameters and the printing density on the printing support 4.
  • the refill device 6 remains mostly inactive (the refill device 6 may compensate for the normal ink consumption of the machine).
  • the controller 70 activates the refill device 6 selecting, upon consideration of the measured values detected by the sensor 71, and upon computing the desired ink composition and the composition and amount of corrective ink, activates the refill device to draw the appropriate amount and percentages of ink from the different ink tanks 62.
  • the extra amount of ink is pumped into the main circuit and then received by the ink supplying unit module in which it wets the inking roller and thus becomes used in the printing process.
  • the control means can also act on the temperature of the inking roller to influence the ink viscosity, or decide to remove some ink from the main circuit 5 to accelerate the printing parameter correction.
  • the outlet device 9 can also be used for flushing the system with a cleaning fluid that circulating in the main circuit cleans it and empties it completely before processing an ink of a different nature.
  • a further option is also to mix the ink circulating in the circuit with an ink characterised by a different ink, thus obtaining an even differently coloured ink. In this way, a number of different colours can be accomplished without having to replace the ink in the ink supplying module altogether.
  • UV inks examples include UV inks, water-based inks and solvent-based inks, but this notwithstanding, the system according to the invention can be applicable also with inks of different nature.
  • heating the inking roller 1 is the preferred solution.
  • heating the ink in the main circuit can advantageously be used to keep the ink at an intermediate temperature, which may be chosen as the minimal temperature expected to be ever used for printing, but not for bringing the ink to the desired temperature. Keeping the ink at a minimal temperature may also be a guarantee for a good mixing and flow of the ink in the main circuit.
  • Known systems can be used for a heating of the inking roller 1, heating that is then transmitted by thermal conduction to the ink that is spread over the roller.
  • the heating of the anilox can be obtained by a heat carrier fluid that is made to flow inside the anilox, underneath the engraved surface; the fluid is heated in a controlled manner by a heating surface inside or outside the anilox.
  • these systems are structurally complex and costly.
  • the preferred solution to heat the inking roller uses inductive heating.
  • the inking roller 1 comprises a magnetic inductor 100 arranged close to the inking roller 1 so that a magnetic field generated by such inductor affects the roller at least partially.
  • the magnetic inductor may be used to heat an ad hoc inking roller, or may be used to heat the gravure cylinder directly (in the latter case, the gravure cylinder may act as an inking roller, thus the inking roller mentioned in the claims may refer to the gravure cylinder when the invention is applied to a rotogravure printing machine).
  • the magnetic inductor 100 comprising, for instance, a coil inductor or solenoid, are such to generate, when a current (such as alternate current) runs through it, a magnetic field in its surrounding space.
  • This surrounding space involves at least part of the inking roller and at least its outer surface 10. It is configured to heat said part of the inking roller over the whole width of the inking roller.
  • parasitic currents are generated that cause a heating of the ferromagnetic material and thus of the outer surface of the inking roller.
  • the ink over the surface of the roller is also heated, as a result of the thermal conduction by the underlying surface, and as a result of the heating the physical properties, e.g.
  • the improved transfer of the ink from the anilox inking to the plate-carrier roller, and from the latter to the printing support has a positive outcome as far as the quality of the print is concerned, an outcome that can be verified on the printing parameters.
  • the control means 7 can be operationally associated with the magnetic inductor 100.
  • the control means can include an electronic controller that is in turn operationally linked with the sensor 71 that measures a measured value of the printing parameters on the printing support.
  • the electronic controller 70 switches the magnetic inductor on, i.e. makes the electric current run through the coil to generate the magnetic field causing the temperature to rise on the outer surface of the anilox.
  • a temperature sensor 110 can also be linked to the electronic controller, to detect the temperature of the engraved outer surface 10; accordingly, in case this measured temperature does not correspond to the desired value, the controller 70 varies the frequency and/or the power of the current circulating in the coil, until the measured temperature value matched the desired one. Indeed, by varying the frequency and/or the power of the supplied alternate current running in the coil, a magnetic field variation is obtained, and a resulting change of the induced currents, thereby tuning their penetration depth and their heat generating effect.
  • the inductive heating device can be even applied to an already existing printing unit, and to any anilox roller, including the anilox sleeve (having an outer sleeve inserted over a sleeve-bearing core or mandrel).

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (11)

  1. Dispositif pour fournir de l'encre à un module d'alimentation en encre (3) d'une machine d'impression et pour le réglage de paramètres d'impression, la machine d'impression comprenant un rouleau encreur (1) adapté pour être mouillé par le module d'alimentation en encre (3), et un support d'impression (4), sur lequel l'encre est transférée depuis le rouleau encreur (1), le dispositif comprenant
    - un circuit d'alimentation principal (50) pour la remise en circulation d'encre depuis une sortie (30) vers une entrée (31) du module d'alimentation en encre (3) ; le circuit d'alimentation principal (50) et le module d'alimentation en encre (3) définissant un circuit principal (5) ;
    - un dispositif de recharge d'encre (6) comprenant deux réservoirs (62) pour stocker un liquide ;
    - le dispositif de recharge d'encre (6) est configuré pour recharger le circuit d'alimentation principal (50) avec de l'encre supplémentaire tirée des réservoirs (62) ;
    - des moyens de forçage de circulation (51) disposés sur le circuit principal (5) pour la recirculation et le mélange de l'encre ;
    - un capteur (71) configuré pour obtenir une valeur mesurée des paramètres d'impression sur le support d'impression (4) ;
    - des moyens de commande (7) adaptés pour comparer la valeur mesurée des paramètres d'impression avec une valeur cible des paramètres d'impression ;
    - le dispositif de recharge d'encre (6) étant adapté pour être raccordé de manière fonctionnelle aux moyens de commande (7), selon lequel, lorsque la valeur mesurée des paramètres d'impression diffère de la valeur cible, le dispositif de recharge (6) est activé par les moyens de commande pour fournir une première quantité d'encre supplémentaire au circuit principal.
    caractérisé en ce qu'il comprend en outre
    - un dispositif de sortie d'encre (9) pour retirer de l'encre du circuit principal (5) ; le dispositif de sortie d'encre (9) est agencé pour être positionné en aval du module d'alimentation en encre (3), qui est agencé pour être positionné en aval du dispositif de recharge d'encre (6) sur le circuit principal (5).
  2. Unité d'impression d'une machine d'impression pour le réglage de paramètres d'impression, l'unité d'impression comprenant
    - le dispositif pour fournir de l'encre selon une quelconque revendication précédente ;
    - un module d'alimentation en encre (3) ;
    - un rouleau encreur (1) adapté pour être mouillé par le module d'alimentation en encre (3) ;
    - des moyens de régulation de température pour chauffer au moins une partie de la surface (10) du rouleau encreur (1) ;
    dans laquelle les moyens de régulation de température sont raccordés de manière opérationnelle aux moyens de commande (7).
  3. Unité d'impression selon la revendication 2, dans laquelle les moyens de régulation de température comprennent un inducteur magnétique (100) agencé à proximité du rouleau encreur (1), selon laquelle un champ magnétique généré par l'inducteur magnétique (100) affecte, au moins en partie, le rouleau encreur.
  4. Unité d'impression selon la revendication 2 ou 3, comprenant un capteur de température (110) relié de manière opérationnelle aux moyens de commande (7) pour mesurer la température d'une surface externe (10) du rouleau encreur (1).
  5. Unité d'impression selon la revendication 3 ou 4, dans laquelle les moyens de commande (7) sont adaptés pour régler la fréquence et la puissance du courant circulant dans l'inducteur magnétique (100).
  6. Procédé pour alimenter en encre un module d'alimentation en encre d'une machine d'impression, en particulier une machine d'impression flexographique ou par héliogravure, et pour le réglage des paramètres d'impression de la machine d'impression, la machine comprenant un rouleau encreur (1) adapté pour être mouillé par le module d'alimentation en encre (3), et un support d'impression (4), sur lequel ladite encre est transférée depuis le rouleau encreur, le procédé comprenant les étapes consistant à :
    - recharger une première quantité d'encre dans un circuit d'alimentation principal (50) par le biais du dispositif de recharge d'encre (6) ; le circuit d'alimentation principal (50) raccordé au module d'alimentation en encre (3) définissant un circuit principal (5) ;
    - utiliser des moyens de commande (7) raccordés de manière opérationnelle à un capteur (71) pour obtenir une valeur mesurée des paramètres d'impression sur le support d'impression (4) et comparer la valeur mesurée avec une valeur cible des paramètres d'impression ; lorsque la valeur mesurée diffère de la valeur cible, activer, par le biais des moyens de commande (7), l'apport de la première quantité d'encre au circuit principal par le dispositif de recharge (6) ;
    caractérisé en ce qu'il comprend en outre :
    - forcer l'écoulement d'encre depuis une sortie (30) jusqu'à une entrée (31) du module d'alimentation en encre (3) dans un circuit d'alimentation principal (50) ;
  7. Procédé selon la revendication 6, pour une machine comprenant un inducteur magnétique et un capteur de température (110), dans lequel le procédé comprend les étapes consistant à :
    - régler le chauffage du rouleau encreur (1) par le biais des moyens d'induction magnétique (100) ;
    - mesurer la température de la surface du rouleau encreur (1) à l'aide du capteur de température (110) ;
    - et, lorsque la température du rouleau encreur (1) diffère d'une température cible, activer, par le biais des moyens de commande (7), le réglage du courant ou de la fréquence ou du courant et de la fréquence fournis à l'inducteur (100).
  8. Procédé selon la revendication 6 ou 7, dans lequel le circuit principal (5) comprend un dispositif de sortie d'encre (9), comprenant l'étape consistant à utiliser le dispositif de sortie d'encre (9) pour retirer une seconde quantité d'encre du circuit principal (5) pendant que le dispositif de recharge (6) est utilisé pour recharger une première quantité d'encre dans le circuit d'alimentation principal (50).
  9. Procédé selon la revendication 8, dans lequel la seconde quantité d'encre est égale à la première quantité d'encre.
  10. Procédé selon l'une quelconque des revendications 6-9, dans lequel le dispositif de recharge d'encre (6) comprend une pompe (61) associée aux deux, ou plus, réservoirs (62), dont chacun contient une encre différente, dans la mesure où la quantité ou le type de pigment est concerné, l'unité de commande électronique (70) active la pompe pour tirer de manière sélective la quantité supplémentaire d'encre à partir de l'un ou l'autre desdits réservoirs (62).
  11. Procédé selon la revendication 9, dans lequel la première quantité d'encre fournie au circuit principal (5) par le dispositif de recharge (6) est déterminée en fournissant de l'encre au circuit principal (5) avec le dispositif de recharge (6) tout en retirant le même quantité d'encre du circuit principal (5) à l'aide du dispositif de sortie d'encre (9) jusqu'à ce que la valeur mesurée des paramètres d'impression sur le support d'impression (4) corresponde à la valeur cible des paramètres d'impression.
EP17718338.1A 2016-04-07 2017-04-06 Système et procédé pour fournir de l'encre depuis plusieurs sources à une machine d'impression Active EP3439884B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITUA20162392 2016-04-07
ITUA20162386 2016-04-07
PCT/EP2017/025083 WO2017174219A1 (fr) 2016-04-07 2017-04-06 Système et procédé pour fournir de l'encre depuis plusieurs sources à une machine d'impression

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Publication number Priority date Publication date Assignee Title
BR112021011479A2 (pt) * 2018-12-20 2021-08-31 Bobst Firenze S.R.L. Sistema e método de distribuir tinta usando pressão
WO2020234003A1 (fr) * 2019-05-20 2020-11-26 Bobst Bielefeld Gmbh Système d'impression et procédé pour ajuster une recette d'encre d'un système d'impression

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4108883A1 (de) * 1991-03-19 1992-09-24 Sengewald Karl H Gmbh Druckvorrichtung
DE10159387A1 (de) * 2001-12-04 2003-06-12 Windmoeller & Hoelscher Verpackungsdruckmaschine mit eingebauter automatischer Vergleichsfunktion zwischen Druck- und Sollbild
ATE524314T1 (de) * 2007-12-06 2011-09-15 Windmoeller & Hoelscher Farbmanagement
DE102008000062B4 (de) * 2008-01-15 2011-07-21 KOENIG & BAUER Aktiengesellschaft, 97080 Verfahren und eine Vorrichtung zur Temperierung eines Zylinders und/oder einer Walze einer Rotationsdruckmaschine
DE102009001218B4 (de) * 2009-02-27 2013-02-07 Koenig & Bauer Aktiengesellschaft Verfahren zur Temperierung wenigstens eines Zylinders oder einer Walze eines Druckwerkes einer Druckmaschine
US9327489B2 (en) 2014-01-24 2016-05-03 Eastman Kodak Company Controlling line widths in flexographic printing
BR112016021716B1 (pt) * 2014-03-21 2022-02-15 Bobst Firenze S.R.L. Dispositivo para detectar e ajustar os parâmetros de impressão continuamente em uma máquina de impressão flexográfica e método para detectar e ajustar a densidade de impressão e os parâmetros colorimétricos em uma máquina de impressão flexográfica
ES2631329T3 (es) 2014-08-11 2017-08-30 Comexi Group Industries, S.A.U Sistema y método de corrección de color en trabajos de impresión ejecutados en una máquina impresora

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EP3439884A1 (fr) 2019-02-13
PL3439884T3 (pl) 2024-07-08
ES2977975T3 (es) 2024-09-03
WO2017174219A1 (fr) 2017-10-12

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