EP2325017A1 - System and method for depositing solidifiable translucent fluid having a certain thickness - Google Patents

System and method for depositing solidifiable translucent fluid having a certain thickness Download PDF

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Publication number
EP2325017A1
EP2325017A1 EP10191399A EP10191399A EP2325017A1 EP 2325017 A1 EP2325017 A1 EP 2325017A1 EP 10191399 A EP10191399 A EP 10191399A EP 10191399 A EP10191399 A EP 10191399A EP 2325017 A1 EP2325017 A1 EP 2325017A1
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EP
European Patent Office
Prior art keywords
image
substrate
solidifiable
printed
finished product
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.)
Granted
Application number
EP10191399A
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German (de)
French (fr)
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EP2325017B1 (en
Inventor
Edmond Abergel
Raphaël Renaud
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MGI Digital Technology SA
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MGI France SA
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Priority to SI201030155T priority Critical patent/SI2325017T1/en
Publication of EP2325017A1 publication Critical patent/EP2325017A1/en
Application granted granted Critical
Publication of EP2325017B1 publication Critical patent/EP2325017B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
    • B41J2/2114—Ejecting transparent or white coloured liquids, e.g. processing liquids

Definitions

  • the present invention relates to the field of ink jet printers and more particularly to the field of varnish deposition systems during inkjet printing.
  • inkjet printing on a so-called closed surface such as plastic or certain types of paper, for which the surface is not prepared to receive an impression, raises several problems. .
  • the ink jet deposit imposes a thickness of about fifteen microns per deposited ink color, as opposed to a thickness of five microns in the context of a traditional offset printing, which leads to a variation of the thickness of the printing of the order of sixty microns for four-color printing between a printed area and a non-printed area, and thus the formation of a relief on the substrate.
  • the discarded ink drops do not penetrate the surface of the substrate and exhibit an evasion effect by spreading over the surface of the substrate, which leads to a problem of accuracy of printing.
  • the deposited ink forms a layer of thickness of the order of ten microns and leaves on the surface a relief impression, which again is caused to penetrate into the substrate when the one is absorbent.
  • the document US 7,451,698 offers an offset printing which can be partially covered with a layer of varnish forming a pattern.
  • a printing method beyond the simple fact that it is not suitable for inkjet printing devices and that it is only a strictly aesthetic purpose, does not make it possible to solve on the one hand the problem of the fixing and the migration of the ink during a printing on a closed substrate and on the other hand the problem of the absorption of the ink during a printing on a substrate fibrous paper type.
  • Such a method does not make it possible to obtain a substantial improvement in the tactile and visual qualities of the printing of the finished product, especially when the substrate used is a closed substrate.
  • the present invention aims to overcome at least one of the disadvantages of known solutions of the state of the art by providing an inkjet printing to overcome a step of treating the surface of the substrate or an additional finishing step of the product exiting the printing machine.
  • the jet printing system for obtaining a finished product is characterized in that the system comprises solidifiable translucent fluid deposition control means controlled by a processing device taking into account the firstly the areas not provided with ink and secondly the number of colors in the ink-filled areas, to determine the thickness of the fluid layer deposited in the area of interest so as to obtain the same thickness in the areas provided with ink and not provided with ink.
  • the jet printing system for obtaining a finished product is characterized in that the system comprises means for controlling the solidifiable translucent fluid deposition controlled by a device for treating the finished product.
  • Printed or printed image includes a grayscale image conversion element and an image calculation element of the converted image negative.
  • the jet printing system for obtaining a finished product is characterized in that the printing system comprises a second station for depositing, in a zone, a thickness of fluid translucent solidifiable controlled proportionally to the thickness of ink that will be deposited later in the area, this position being positioned upstream of the printing station of the image on the substrate relative to the direction of movement of the substrate in the system.
  • the jet printing system for obtaining a finished product is characterized in that the first solidifiable translucent fluid deposition station is positioned between the printing station of the image on the substrate and the drying station of the image printed on the surface of the substrate.
  • the jet printing system for obtaining a finished product is characterized in that the system comprises a device for processing the image printed or to be printed by the printing station. in order to determine a variation in the thickness of the translucent ink deposited by at least one ink deposition station as a function of the image printed or to be printed.
  • the jet printing system for obtaining a finished product is characterized in that the jet nozzles of the system are arranged in a ramp and selectively controlled by function of the file of the image printed or to be printed or according to the negative image file of this image.
  • the jet printing system for obtaining a finished product is characterized in that the jet nozzles of the system are arranged to deposit a solidifiable translucent fluid having a surface tension of 28 mN / m at 23 ° C.
  • the jet printing system for obtaining a finished product is characterized in that the system comprises a solidification station for the solidifiable translucent fluid specifically deposited by the second deposit station, upstream. of the solidifiable translucent fluid deposition station relative to the direction of displacement of the substrate in the system
  • the jet printing system for obtaining a finished product is characterized in that the solidification station uses UV radiation to allow a polymerization reaction and / or fluid stiffening solidifiable translucent of the printed image and / or translucent ink deposited.
  • Another object of the invention is to provide a method for obtaining a printed product whose finished surface is without relief.
  • the jet printing process for obtaining a finished product is characterized in that a deposition step of variable thickness of solidifiable translucent fluid precedes the printing step of the finished product. image on the substrate.
  • the jet printing method for obtaining a finished product is characterized in that the step of depositing a variable thickness of solidifiable translucent fluid is performed following the printing the image on the substrate and precedes the step of drying the printed image on the substrate.
  • the jet printing method for obtaining a finished product is characterized in that the method comprises a step of processing the printed image or to be printed during the step of printing so as to define a variation of the solidifiable translucent fluid thickness deposited during at least one ink deposition step as a function of the printed or printed image.
  • the jet printing process for obtaining a finished product is characterized in that the processing step takes into account, on the one hand, the zones that are not provided with ink and on the other hand, the number of colors in the ink-filled areas, to determine the thickness of the fluid layer deposited in the area of interest so as to obtain the same thickness in the areas provided with ink and not provided with ink.
  • the jet printing method for obtaining a finished product is characterized in that the step of processing the printed or printed image comprises a step of converting the image in gray level and a step of calculating the negative of the converted image.
  • the jet printing method for obtaining a finished product is characterized in that at least one solidification step of the solidifiable translucent fluid deposited succeeds each step of depositing a solidifiable translucent fluid.
  • the jet printing process for obtaining a finished product is characterized in that the step or steps of solidification of the solidifiable translucent fluids deposited is carried out sufficiently early to prevent spreading of the solidifiable translucent fluid. on the printed image get a matte and / or satin surface product.
  • the jet printing process for obtaining a finished product is characterized in that the solidification step (s) of the solidifiable translucent fluids deposited is carried out once the solidifiable translucent fluid has had the time to be sufficiently spread on the printed image to obtain a smooth and / or glossy surface product.
  • solidifiable translucent fluid may be applied to varnishes and other clear viscous products intended for coating substrate surfaces.
  • Solidification of the translucent fluid can be effected by heating following evaporation of one of the constituents of the fluid.
  • this fluid operates its solidification by a polymerization of at least one of its constituents, for example under the effect of UltraViolet radiation.
  • the translucent fluid used has a surface tension of between 15 and 28 mN / m at 23 ° C, preferably between 20 and 28 mN / m, to limit its possible absorption by the substrate (5) to be printed.
  • These substrates (5) may be, for example and without limitation a non-fibrous support, for example non-limiting plastic, poly-carbon, PVC, polyester, having a certain flexibility. Such substrates are called closed substrates.
  • the present invention relates to a printing device intended in particular for the deposition of translucent ink on the surface of a printed substrate or intended to be so that the finished surface obtained is without relief.
  • the state of the art inkjet printing systems comprise in particular a "virgin" substrate charger intended to be printed, this charger being disposed upstream of the system and a device for recovering the substrate once printed, disposed downstream of the system.
  • the substrate is moved between different successive stations by means of transporting or driving the substrate, for example a treadmill, or conversely by moving the different stations of the printing system over a substrate that remains fixed.
  • the system according to the invention comprises an inkjet printing station (1) of the substrate.
  • this printing station (1) is arranged to allow printing of the substrate in four-color process.
  • This printing station (1) is associated with a drying station (2) of the image printed on the substrate.
  • the particularity of the invention is to integrate at least one deposition station (3a, 3b) of solidifiable translucent fluid (6, 8) on the substrate (5) so that the step of depositing the translucent fluid (6, 8) is performed before the substrate (5) printed does not undergo a drying step at the station (2) adapted to this function.
  • this deposit (3a, 3b) of solidifiable translucent fluid (6, 8) on the substrate is made so that the thickness of the translucent ink is variable.
  • the solidifiable translucent fluid (6) thus deposited forms a relief.
  • this relief obtained during the deposition (3a) of the translucent fluid can be predefined and controlled from particular parameters, as explained below in the document.
  • the deposition station (3a, 3b) translucent fluid solidifiable on the substrate can be associated with a solidification station (4a, 4b) of the translucent fluid deposited.
  • This solidification station (4a, 4b) is then positioned downstream of the deposition station (3a, 3b) of translucent fluid (6, 8) with respect to the direction of movement of the substrate (5) in the system.
  • the solidification device (4a, 4b) used uses UV (ultraviolet) radiation to carry out a polymerization of at least one of the solidifiable translucent fluid compounds (6) and therefore a stiffening of the ink of the printed image.
  • the system according to the invention comprises a first solidifiable translucent fluid deposition station (3b) (6) positioned downstream of the inkjet printing station (1) on the substrate ( 5), but upstream of the drying station (2) of the printed ink, with respect to the direction of movement of the substrate in the system.
  • This particular positioning of the deposition station (3b) solidifiable translucent fluid (6) allows the recovery of the printed substrate by a solidifiable translucent fluid layer (6) which allows to obtain the type of finish desired for the product according to a parameter explained later in the document.
  • the system according to the invention comprises a second solidifiable translucent fluid deposition station (3a) (6) positioned upstream of the inkjet printing station (1) on the substrate (5). relative to the direction of displacement of the substrate in the system.
  • This particular positioning of the fluid deposition station (3a) translucent solidifiable (6) on the one hand allows to cover the substrate with a fluid layer (6) whose thickness facilitates the adhesion of the printed image to the substrate (5) at the printing station (1). ), and secondly improves the printing qualitatively through a relief deposit of solidifiable translucent fluid (6), so as to avoid an escape of the printing ink (7).
  • the solidifiable translucent fluid deposits (6) are made so that the thickness is variable and allows a suppression of all the variations of relief on the surface of the substrate (5) which would result from the deposition. inks, for example in four-color process, when printing. Furthermore, the coating of the printing of a solidifiable translucent fluid layer (8) thus makes it possible to obtain a printed substrate (5) provided with a surface without relief and thus to obtain a valued finished product.
  • the system according to the invention integrates a first solidifiable translucent fluid deposition station (3b) (8) positioned downstream of the inkjet printing station (1) on the substrate (5). and a second solidifiable translucent fluid depositing station (3a) positioned upstream of the inkjet printing station (1).
  • the second deposit station (3a) solidifiable translucent fluid (6) allows through a deposit of varying thickness, to overcome the variations in relief of the printed substrate, while the first station (3b) solidifiable translucent fluid ( 8) makes it possible to make a finishing deposit of the surface of the product.
  • each of these deposition stations (3a, 3b) of solidifiable translucent fluid (6, 8) can be associated with a respective solidification station (4a, 4b).
  • the variation of the solidifiable translucent fluid thickness (6) deposited on the substrate by the second deposition station (3a) is defined from at least one particular parameter.
  • This setting is the image printed by the print station.
  • the system according to the invention connects the printing station with the deposition station (s) (3a, 3b) of solidifiable translucent fluid, either directly or indirectly via a central unit, so that a file of the image printed or to be printed , or a processed file of this image is transmitted to the deposition stations (3a, 3b) solidifiable translucent fluid.
  • a mapping of the surface of the substrate (5) comprising the different variations of the solidifiable translucent fluid thickness to be deposited can be established so that the superposition of the fluids Translucent and printing inks result in a smooth, flat surface.
  • the processing used preferably involves a first step of conversion of the image into monochrome, also called gray level, and a second step of calculating the negative of the converted image.
  • the image obtained after treatment then corresponds to the negative of the printed image converted into gray level.
  • the translucent ink deposited on the substrate according to a map corresponding to the image obtained after treatment then makes it possible to compensate for the differences in relief of the substrate once it is printed.
  • a first file corresponds to a map of all the points of the printed or printed image comprising all four colors of printing ink.
  • a second file corresponds to a map of all the points of the printed or printed image comprising only three colors of printing ink.
  • a third file corresponds to a map of all the points of the printed or printed image comprising only two colors of printing ink.
  • a fourth file corresponds to a map of all the points of the printed or printed image comprising a single color of printing ink, and a last and fifth file corresponds to a map of the set of points of the image. printed or printed image that does not have any printing ink. From these extracted files, the translucent ink thickness to be deposited determined by the Processing device is inversely proportional to the number of colors of printing ink used.
  • the processing steps of the printed or printed image are performed in a suitable device comprising calculation, conversion and / or processing elements suitable for carrying out these steps.
  • This adapted device is positioned either in a central unit that manages the production of the finished product by being connected to several of the stations (1, 2, 3a, 3b, 4a, 4b) of the system, or at the relevant stations of the system.
  • the process used to obtain the upgraded finished product of the invention also involves a spreading factor of the translucent fluid solidifiable on the printing ink, after the deposition of the printing ink. .
  • the preservation of this effect during the process leads to a finished product whose surface is smooth and shiny.
  • This physical phenomenon can be slowed or stopped by the solidification stations (4a, 4b) which stiffens the deposited translucent ink, increases the surface tension and eliminates this possibility of spreading.
  • the solidification of the solidifiable translucent fluid then has the advantage of obtaining a finished product whose surface is matte and satin. The presence or absence of solidification is therefore particularly important for determining the surface finish of the printed substrate (5).
  • the relief obtained by the translucent ink thickness variations deposited is more easily maintained to allow compensation of the relief achieved by the ink deposition (7) during the printing step (1).
  • variable deposition (3a) of solidifiable translucent fluid (6) on the substrate (5) can be carried out according to two different operating modes represented on the Figures 2 and 3 .
  • the second translucent fluid deposition station (3a) (6) performs a deposition of the fluid so that the superposition of the fluid layer (6) deposited and the various layers (c1, c2, c3, c4) of inks (7) printing at the points considered leads to an identical thickness over the entire surface of the substrate (5) printed.
  • the translucent fluid thickness variations (6) deposited thus form several deposition zones prepared to receive a predetermined number of layers (c1, c2, c3, c4) of printing inks (7).
  • the areas of the surface of the substrate (5) that are not provided with ink thus have the largest translucent fluid thickness. Conversely, the areas provided with the four colors of four-color printing ink have the lowest (or even zero) fluid thickness (6).
  • the image obtained during the deposition of the solidifiable translucent fluid (6) corresponds to the negative of the printed image, or intended to be printed, converted into gray level and thus makes it possible to compensate for the differences in relief of the substrate once the it is printed.
  • the uniform surface of the printed substrate (5) can then be covered with a uniform additional layer (8) of translucent fluid solidifiable by the first deposition station (3b).
  • the second translucent fluid deposition station (3a) performs a fluid deposition so that the thickness of the deposited fluid layer (6) is proportional to the number of layers (c1, c2, c3, c4) of printing inks (7) at the points considered, regardless of the final thickness accumulating the thickness of the deposited fluid and the thickness of the various layers (c1, c2, c3, c4) of inks (7) of impression.
  • the variations in thickness of the deposited fluid layer (6) then form an enhanced relief after the step of depositing the printing ink (7).
  • the removal of this relief for obtaining of a uniform surface is obtained by the deposition of a second solidifiable translucent fluid layer (8) by the first deposition station (3b), which compensates for relief variations on the surface of the printed substrate (5).
  • the variation of solidifiable translucent fluid thickness (6) deposited makes it possible to define the various inking zones as a function of the number of deposited ink layers.
  • the deposition of this fluid layer being generally followed by solidification of the fluid, the printing ink (7) which is then deposited has a spreading and evasion which is reduced or even eliminated due to the tension large area (between 15 and 28 mN / m) of the fluid that compartmentalizes the printing areas according to the number of layers (c1, c2, c3, c4) of inks (7) deposited.

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  • Ink Jet (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The system has a printing station (1) for ink-jet printing of an image on a surface of a substrate by jet nozzles using printing ink. A depositing station (3a) deposits solidifiable translucent fluid i.e. varnish, on the surface of the substrate to obtain a finished product. The depositing station is placed in an upstream of a printed image drying station (2) with respect to direction of displacement of the substrate. Controlling units control deposition of the solidifiable translucent fluid, and include a negative calculation element of a converted image. An independent claim is also included for an ink-jet printing method for obtaining a finished product.

Description

La présente invention se rapporte au domaine des imprimantes à jet d'encre et plus particulièrement au domaine des systèmes de dépôt de vernis lors d'une impression à jet d'encre.The present invention relates to the field of ink jet printers and more particularly to the field of varnish deposition systems during inkjet printing.

A l'heure actuelle, une impression par jet d'encre sur une surface dite fermée, telle que peut l'être le plastique ou certains types de papier, pour laquelle la surface n'est pas préparée à recevoir une impression, soulève plusieurs problèmes.At present, inkjet printing on a so-called closed surface, such as plastic or certain types of paper, for which the surface is not prepared to receive an impression, raises several problems. .

Le dépôt par jet d'encre impose une épaisseur d'une quinzaine de microns par couleur d'encre déposée, par opposition à une épaisseur de cinq microns dans le cadre d'une impression traditionnelle en offset, ce qui conduit à une variation de l'épaisseur de l'impression de l'ordre de la soixantaine de microns pour une impression en quadrichromie entre une zone imprimée et une zone non-imprimée, et donc à la formation d'un relief sur le substrat. Par ailleurs, lorsque cette impression est effectuée sur un substrat fermé, les gouttes d'encre jetées ne pénètrent pas la surface du substrat et présentent un effet d'évasion en s'étalant sur la surface du substrat, ce qui conduit à un problème de précision de l'impression.The ink jet deposit imposes a thickness of about fifteen microns per deposited ink color, as opposed to a thickness of five microns in the context of a traditional offset printing, which leads to a variation of the thickness of the printing of the order of sixty microns for four-color printing between a printed area and a non-printed area, and thus the formation of a relief on the substrate. Moreover, when this printing is performed on a closed substrate, the discarded ink drops do not penetrate the surface of the substrate and exhibit an evasion effect by spreading over the surface of the substrate, which leads to a problem of accuracy of printing.

Une alternative pour contourner ce problème pourrait être d'utiliser un substrat fibreux de type papier afin d'obtenir une meilleure fixation sur le substrat. Cependant, l'encre projetée par les buses est amenée à pénétrer le substrat, ce qui altère également la qualité de l'impression sur le substrat. Par ailleurs, en réduisant les tensions de surface de l'encre pour limiter sa pénétration dans le substrat, l'encre conserve son effet de relief sur la surface du substrat imprimé.An alternative to circumvent this problem could be to use a fibrous substrate of paper type in order to obtain a better fixation on the substrate. However, the ink projected by the nozzles is caused to penetrate the substrate, which also alters the quality of the printing on the substrate. Moreover, by reducing the surface tensions of the ink to limit its penetration into the substrate, the ink retains its relief effect on the surface of the printed substrate.

Dans le cadre d'une impression offset, l'encre déposée forme une couche d'épaisseur de l'ordre de la dizaine de microns et laisse sur la surface une impression de relief, qui là encore est amené à pénétrer dans le substrat lorsque celui est absorbant. Le document US 7,451,698 propose une impression offset qui peut être recouverte partiellement d'une couche de vernis formant un motif. Cependant, un tel procédé d'impression, au-delà du simple fait qu'il ne soit pas adapté aux dispositifs d'impression par jet d'encre et qu'il n'est qu'une finalité strictement esthétique, ne permet pas de résoudre d'une part le problème de la fixation et de la migration de l'encre lors d'une impression sur un substrat fermé et d'autre part le problème de l'absorption de l'encre lors d'une impression sur un substrat fibreux de type papier. Un tel procédé ne permet pas d'obtenir une amélioration substantielle des qualités, tactiles et visuelles, de l'impression du produit fini, notamment lorsque le substrat utilisé est un substrat fermé.In the context of offset printing, the deposited ink forms a layer of thickness of the order of ten microns and leaves on the surface a relief impression, which again is caused to penetrate into the substrate when the one is absorbent. The document US 7,451,698 offers an offset printing which can be partially covered with a layer of varnish forming a pattern. However, such a printing method, beyond the simple fact that it is not suitable for inkjet printing devices and that it is only a strictly aesthetic purpose, does not make it possible to solve on the one hand the problem of the fixing and the migration of the ink during a printing on a closed substrate and on the other hand the problem of the absorption of the ink during a printing on a substrate fibrous paper type. Such a method does not make it possible to obtain a substantial improvement in the tactile and visual qualities of the printing of the finished product, especially when the substrate used is a closed substrate.

La présente invention a pour but de palier à au moins un des inconvénients des solutions connues de l'état de l'art en proposant une impression à jet d'encre permettant de s'affranchir d'une étape de traitement de la surface du substrat ou d'une étape de finition supplémentaire du produit sortant de la machine d'impression.The present invention aims to overcome at least one of the disadvantages of known solutions of the state of the art by providing an inkjet printing to overcome a step of treating the surface of the substrate or an additional finishing step of the product exiting the printing machine.

Cet objectif est atteint grâce à un système d'impression à jet pour l'obtention d'un produit fini comportant :

  • un poste d'impression par des buses à jet utilisant de l'encre liquide d'impression pour impression à jet d'encre d'au moins une image sur la surface d'un substrat adapté,
    caractérisé en ce que le système comprend également :
  • au moins un premier poste de dépôt par des buses à jet d'une épaisseur variable d'un fluide translucide solidifiable sur la surface du substrat, pour obtenir un produit fini sans relief, positionné en amont du poste de séchage de l'image imprimée par rapport au sens de déplacement du substrat dans le système.
This objective is achieved through a jet printing system for obtaining a finished product comprising:
  • a jet jet printing station using liquid printing ink for printing inkjet of at least one image on the surface of a suitable substrate,
    characterized in that the system further comprises:
  • at least a first deposition station by jet nozzles of variable thickness of a translucent fluid solidifiable on the surface of the substrate, to obtain a finished product without relief, positioned upstream of the drying station of the printed image by relative to the direction of displacement of the substrate in the system.

Selon une particularité de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que le système comprend des moyens de commande du dépôt de fluide translucide solidifiable contrôlés par un dispositif de traitement prenant en compte d'une part les zones non pourvues d'encre et d'autre part le nombre de couleurs dans les zones pourvues d'encre, pour déterminer l'épaisseur de la couche de fluide déposée dans la zone considérée de façon à obtenir la même épaisseur dans les zones pourvues d'encre et non pourvues d'encre.According to a particular embodiment, the jet printing system for obtaining a finished product is characterized in that the system comprises solidifiable translucent fluid deposition control means controlled by a processing device taking into account the firstly the areas not provided with ink and secondly the number of colors in the ink-filled areas, to determine the thickness of the fluid layer deposited in the area of interest so as to obtain the same thickness in the areas provided with ink and not provided with ink.

Selon une première variante de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que le système comprend des moyens de commande du dépôt de fluide translucide solidifiable contrôlés par un dispositif de traitement de l'image imprimée ou à imprimer comprend un élément de conversion de l'image en niveau de gris et un élément de calcul du négatif de l'image convertie.According to a first variant embodiment, the jet printing system for obtaining a finished product is characterized in that the system comprises means for controlling the solidifiable translucent fluid deposition controlled by a device for treating the finished product. Printed or printed image includes a grayscale image conversion element and an image calculation element of the converted image negative.

Selon une seconde variante de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que le système d'impression comprend un second poste de dépôt, dans une zone, d'une épaisseur de fluide translucide solidifiable contrôlée proportionnellement à l'épaisseur d'encre qui sera déposée ultérieurement dans la zone, ce poste étant positionné en amont du poste d'impression de l'image sur le substrat par rapport au sens de déplacement du substrat dans le système.According to a second variant embodiment, the jet printing system for obtaining a finished product is characterized in that the printing system comprises a second station for depositing, in a zone, a thickness of fluid translucent solidifiable controlled proportionally to the thickness of ink that will be deposited later in the area, this position being positioned upstream of the printing station of the image on the substrate relative to the direction of movement of the substrate in the system.

Selon une particularité de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que le premier poste de dépôt de fluide translucide solidifiable est positionné entre le poste d'impression de l'image sur le substrat et le poste de séchage de l'image imprimée sur la surface du substrat.According to a particular embodiment, the jet printing system for obtaining a finished product is characterized in that the first solidifiable translucent fluid deposition station is positioned between the printing station of the image on the substrate and the drying station of the image printed on the surface of the substrate.

Selon une autre particularité de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que le système comprend un dispositif de traitement de l'image imprimée ou à imprimer par le poste d'impression de façon à déterminer une variation de l'épaisseur de l'encre translucide déposée par au moins un poste de dépôt d'encre en fonction de l'image imprimée ou à imprimer.According to another particular embodiment, the jet printing system for obtaining a finished product is characterized in that the system comprises a device for processing the image printed or to be printed by the printing station. in order to determine a variation in the thickness of the translucent ink deposited by at least one ink deposition station as a function of the image printed or to be printed.

Selon une autre particularité de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que les buses à jet du système sont arrangés en rampe et commandées sélectivement en fonction du fichier de l'image imprimée ou à imprimer ou en fonction du fichier image négatives de cette image.According to another particular embodiment, the jet printing system for obtaining a finished product is characterized in that the jet nozzles of the system are arranged in a ramp and selectively controlled by function of the file of the image printed or to be printed or according to the negative image file of this image.

Selon une autre particularité de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que les buses à jet du système sont arrangées pour déposer un fluide translucide solidifiable présentant une tension de surface comprise 15 et 28 mN/m à 23°C.According to another embodiment, the jet printing system for obtaining a finished product is characterized in that the jet nozzles of the system are arranged to deposit a solidifiable translucent fluid having a surface tension of 28 mN / m at 23 ° C.

Selon une autre particularité de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que le système comporte un poste de solidification du fluide translucide solidifiable spécifiquement déposé par le second poste de dépôt, en amont du poste de dépôt du fluide translucide solidifiable par rapport au sens de déplacement du substrat dans le systèmeAccording to another particular embodiment, the jet printing system for obtaining a finished product is characterized in that the system comprises a solidification station for the solidifiable translucent fluid specifically deposited by the second deposit station, upstream. of the solidifiable translucent fluid deposition station relative to the direction of displacement of the substrate in the system

Selon une autre particularité de réalisation, le système d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que le poste de solidification fait intervenir un rayonnement U.V. pour permettre une réaction de polymérisation et/ou de rigidification du fluide translucide solidifiable de l'image imprimée et/ou de l'encre translucide déposée.According to another embodiment, the jet printing system for obtaining a finished product is characterized in that the solidification station uses UV radiation to allow a polymerization reaction and / or fluid stiffening solidifiable translucent of the printed image and / or translucent ink deposited.

Un autre objet de l'invention est de proposer un procédé permettant l'obtention d'un produit imprimé dont la surface finie est sans relief.Another object of the invention is to provide a method for obtaining a printed product whose finished surface is without relief.

Cet objectif est atteint grâce à un procédé d'impression à jet pour l'obtention d'un produit fini dont la surface est exemptée des traitements de l'art antérieur comportant :

  • une étape d'impression par de l'encre d'impression d'au moins une
    image sur la surface d'un substrat adapté,
    caractérisé en ce que le procédé comprend également :
  • au moins une étape de dépôt d'une épaisseur variable d'un fluide translucide solidifiable, pour obtenir un produit fini sans relief, sur la surface du substrat positionné avant l'étape de séchage de l'image imprimée.
This objective is achieved by means of a jet printing process for obtaining a finished product whose surface is exempt from the treatments of the prior art comprising:
  • a step of printing with printing ink of at least one
    image on the surface of a suitable substrate,
    characterized in that the method further comprises:
  • at least one deposition step of variable thickness of a solidifiable translucent fluid, to obtain a finished product without relief, on the surface of the substrate positioned before the step of drying the printed image.

Selon une particularité de réalisation, le procédé d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce qu'une étape de dépôt d'une épaisseur variable de fluide translucide solidifiable précède l'étape d'impression de l'image sur le substrat.According to a particular embodiment, the jet printing process for obtaining a finished product is characterized in that a deposition step of variable thickness of solidifiable translucent fluid precedes the printing step of the finished product. image on the substrate.

Selon une autre particularité de réalisation, le procédé d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que l'étape de dépôt d'une épaisseur variable de fluide translucide solidifiable est effectuée à la suite de l'impression de l'image sur le substrat et précède l'étape de séchage de l'image imprimée sur le substrat.According to another particular embodiment, the jet printing method for obtaining a finished product is characterized in that the step of depositing a variable thickness of solidifiable translucent fluid is performed following the printing the image on the substrate and precedes the step of drying the printed image on the substrate.

Selon une autre particularité de réalisation, le procédé d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que le procédé comprend une étape de traitement de l'image imprimée ou à imprimer lors de l'étape d'impression de façon à définir une variation de l'épaisseur de fluide translucide solidifiable déposée au cours d'au moins une étape de dépôt d'encre en fonction de l'image imprimée ou à imprimer.According to another embodiment, the jet printing method for obtaining a finished product is characterized in that the method comprises a step of processing the printed image or to be printed during the step of printing so as to define a variation of the solidifiable translucent fluid thickness deposited during at least one ink deposition step as a function of the printed or printed image.

Selon une autre particularité de réalisation, le procédé d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que l'étape de traitement prend en compte d'une part les zones non pourvues d'encre et d'autre part le nombre de couleurs dans les zones pourvues d'encre, pour déterminer l'épaisseur de la couche de fluide déposée dans la zone considérée de façon à obtenir la même épaisseur dans les zones pourvues d'encre et non pourvues d'encre.According to another particular embodiment, the jet printing process for obtaining a finished product is characterized in that the processing step takes into account, on the one hand, the zones that are not provided with ink and on the other hand, the number of colors in the ink-filled areas, to determine the thickness of the fluid layer deposited in the area of interest so as to obtain the same thickness in the areas provided with ink and not provided with ink.

Selon une autre particularité de réalisation, le procédé d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que l'étape de traitement de l'image imprimée ou à imprimer comprend une étape de conversion de l'image en niveau de gris et une étape de calcul du négatif de l'image convertie.According to another embodiment, the jet printing method for obtaining a finished product is characterized in that the step of processing the printed or printed image comprises a step of converting the image in gray level and a step of calculating the negative of the converted image.

Selon une autre particularité de réalisation, le procédé d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce qu'au moins une étape de solidification du fluide translucide solidifiable déposé succède à chaque étape de dépôt d'un fluide translucide solidifiable.According to another particular embodiment, the jet printing method for obtaining a finished product is characterized in that at least one solidification step of the solidifiable translucent fluid deposited succeeds each step of depositing a solidifiable translucent fluid.

Selon une variante de réalisation, le procédé d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que la ou les étapes de solidification des fluides translucides solidifiables déposés est opérée suffisamment tôt pour éviter un étalement du fluide translucide solidifiable sur l'image imprimée obtenir un produit de surface matte et/ou satin.According to an alternative embodiment, the jet printing process for obtaining a finished product is characterized in that the step or steps of solidification of the solidifiable translucent fluids deposited is carried out sufficiently early to prevent spreading of the solidifiable translucent fluid. on the printed image get a matte and / or satin surface product.

Selon une variante de réalisation, le procédé d'impression à jet pour l'obtention d'un produit fini est caractérisé en ce que la ou les étapes de solidification des fluides translucides solidifiables déposés est opérée une fois que le fluide translucide solidifiable a eu le temps d'être suffisamment étalée sur l'image imprimée pour obtenir un produit de surface lisse et/ou brillant.According to an alternative embodiment, the jet printing process for obtaining a finished product is characterized in that the solidification step (s) of the solidifiable translucent fluids deposited is carried out once the solidifiable translucent fluid has had the time to be sufficiently spread on the printed image to obtain a smooth and / or glossy surface product.

L'invention, avec ses caractéristiques et avantages, ressortira plus clairement à la lecture de la description faite en référence aux dessins annexés dans lesquels :

  • la figure 1 représente un schéma général d'un système d'impression selon l'invention,
  • la figure 2 représente schématiquement une section représentant les couches de dépôt d'un produit imprimé selon une première variante du procédé selon l'invention,
  • la figure 3 représente schématiquement une section représentant les couches de dépôt d'un produit imprimé selon une seconde variante du procédé selon l'invention.
The invention, with its features and advantages, will emerge more clearly on reading the description given with reference to the appended drawings in which:
  • the figure 1 represents a general diagram of a printing system according to the invention,
  • the figure 2 schematically represents a section representing the deposition layers of a printed product according to a first variant of the process according to the invention,
  • the figure 3 schematically represents a section representing the deposition layers of a printed product according to a second variant of the method according to the invention.

Il convient avant tout de considérer que dans le présent document, le terme « fluide translucide solidifiable » peut être appliqué aux vernis et autres produits visqueux transparents destinés aux recouvrements de surfaces de substrat. La solidification du fluide translucide peut être opérée par chauffage suite à une évaporation d'une des constituants du fluide. Toutefois, selon un mode opératoire préféré, ce fluide opère sa solidification par une polymérisation d'au moins un de ses constituants par exemple sous l'effet d'un rayonnement UltraViolet. Le fluide translucide utilisé présente une tension de surface comprise entre 15 et 28 mN/m à 23°C, préférentiellement entre 20 et 28 mN/m, pour limiter son éventuelle absorption par le substrat (5) à imprimer.It should first be borne in mind that in this document the term "solidifiable translucent fluid" may be applied to varnishes and other clear viscous products intended for coating substrate surfaces. Solidification of the translucent fluid can be effected by heating following evaporation of one of the constituents of the fluid. However, according to a preferred procedure, this fluid operates its solidification by a polymerization of at least one of its constituents, for example under the effect of UltraViolet radiation. The translucent fluid used has a surface tension of between 15 and 28 mN / m at 23 ° C, preferably between 20 and 28 mN / m, to limit its possible absorption by the substrate (5) to be printed.

Ces substrats (5) pouvant être, par exemple et de façon non limitative un support non fibreux, par exemple de façon non limitative plastique, poly-carbone, PVC, polyester, comportant une certaine souplesse. De tels substrats sont appelés substrats fermés.These substrates (5) may be, for example and without limitation a non-fibrous support, for example non-limiting plastic, poly-carbon, PVC, polyester, having a certain flexibility. Such substrates are called closed substrates.

La présente invention porte sur un dispositif d'impression destiné notamment au dépôt d'encre translucide sur la surface d'un substrat imprimé ou destiné à l'être de sorte que la surface finie obtenue soit sans relief.The present invention relates to a printing device intended in particular for the deposition of translucent ink on the surface of a printed substrate or intended to be so that the finished surface obtained is without relief.

Les systèmes d'impression jet d'encre de l'état de l'art comprennent notamment un chargeur de substrat « vierge » destiné à être imprimé, ce chargeur étant disposé en amont du système et un dispositif de récupération du substrat une fois imprimé, disposé en aval du système. Selon un mode de réalisation couramment utilisé, le substrat est déplacé entre différents postes successifs par un moyen de transport ou d'entraînement du substrat, par exemple un tapis roulant, ou inversement en déplaçant les différents postes du système d'impression par-dessus un substrat qui demeure fixe. Entre le chargeur du substrat et le dispositif de récupération, le système selon l'invention comprend un poste d'impression (1) jet d'encre du substrat. Selon un mode de réalisation particulier et non limitatif, ce poste d'impression (1) est arrangé pour permettre une impression du substrat en quadrichromie. Ce poste d'impression (1) est associé avec un poste de séchage (2) de l'image imprimée sur le substrat.The state of the art inkjet printing systems comprise in particular a "virgin" substrate charger intended to be printed, this charger being disposed upstream of the system and a device for recovering the substrate once printed, disposed downstream of the system. According to a commonly used embodiment, the substrate is moved between different successive stations by means of transporting or driving the substrate, for example a treadmill, or conversely by moving the different stations of the printing system over a substrate that remains fixed. Between the substrate charger and the recovery device, the system according to the invention comprises an inkjet printing station (1) of the substrate. According to a particular and nonlimiting embodiment, this printing station (1) is arranged to allow printing of the substrate in four-color process. This printing station (1) is associated with a drying station (2) of the image printed on the substrate.

Par rapport à ce système d'impression connu de l'état de l'art, la particularité de l'invention est d'intégrer au moins un poste de dépôt (3a, 3b) de fluide translucide solidifiable (6, 8) sur le substrat (5) de sorte que l'étape de dépôt du fluide translucide (6, 8) soit opérée avant que le substrat (5) imprimé ne subisse une étape de séchage au niveau du poste (2) adaptée à cette fonction. De plus, ce dépôt (3a, 3b) de fluide translucide solidifiable (6, 8) sur le substrat est effectué de sorte que l'épaisseur de l'encre translucide soit variable. Le fluide translucide solidifiable (6) ainsi déposé forme un relief. Toutefois, ce relief obtenu lors du dépôt (3a) du fluide translucide peut être prédéfini et contrôlé à partir de paramètres particuliers, comme expliqué plus bas dans le document. Par ailleurs, selon une particularité de réalisation, le poste de dépôt (3a, 3b) de fluide translucide solidifiable sur le substrat peut être associé à un poste de solidification (4a, 4b) du fluide translucide déposée. Ce poste de solidification (4a, 4b) se trouve alors positionné en aval du poste de dépôt (3a, 3b) de fluide translucide (6, 8) par rapport au sens de déplacement du substrat (5) dans le système. De façon non limitative, le dispositif de solidification (4a, 4b) utilisé fait intervenir un rayonnement UV (ultraviolets) pour réaliser une polymérisation d'au moins un des composés du fluide translucide solidifiable (6) et donc une rigidification de l'encre de l'image imprimée.Compared to this printing system known from the state of the art, the particularity of the invention is to integrate at least one deposition station (3a, 3b) of solidifiable translucent fluid (6, 8) on the substrate (5) so that the step of depositing the translucent fluid (6, 8) is performed before the substrate (5) printed does not undergo a drying step at the station (2) adapted to this function. In addition, this deposit (3a, 3b) of solidifiable translucent fluid (6, 8) on the substrate is made so that the thickness of the translucent ink is variable. The solidifiable translucent fluid (6) thus deposited forms a relief. However, this relief obtained during the deposition (3a) of the translucent fluid can be predefined and controlled from particular parameters, as explained below in the document. Furthermore, according to a particular embodiment, the deposition station (3a, 3b) translucent fluid solidifiable on the substrate can be associated with a solidification station (4a, 4b) of the translucent fluid deposited. This solidification station (4a, 4b) is then positioned downstream of the deposition station (3a, 3b) of translucent fluid (6, 8) with respect to the direction of movement of the substrate (5) in the system. In a nonlimiting manner, the solidification device (4a, 4b) used uses UV (ultraviolet) radiation to carry out a polymerization of at least one of the solidifiable translucent fluid compounds (6) and therefore a stiffening of the ink of the printed image.

Ainsi, selon une première variante de réalisation, le système selon l'invention comprend un premier poste de dépôt (3b) de fluide translucide solidifiable (6) positionné en aval du poste d'impression (1) jet d'encre sur le substrat (5), mais en amont du poste de séchage (2) de l'encre imprimée, par rapport au sens de déplacement du substrat dans le système. Ce positionnement particulier du poste de dépôt (3b) de fluide translucide solidifiable (6) permet le recouvrement du substrat imprimé, par une couche de fluide translucide solidifiable (6) qui permet de d'obtenir le type de finition souhaité pour le produit selon un paramètre expliqué plus bas dans le document.Thus, according to a first variant embodiment, the system according to the invention comprises a first solidifiable translucent fluid deposition station (3b) (6) positioned downstream of the inkjet printing station (1) on the substrate ( 5), but upstream of the drying station (2) of the printed ink, with respect to the direction of movement of the substrate in the system. This particular positioning of the deposition station (3b) solidifiable translucent fluid (6) allows the recovery of the printed substrate by a solidifiable translucent fluid layer (6) which allows to obtain the type of finish desired for the product according to a parameter explained later in the document.

Selon une seconde variante de réalisation, le système selon l'invention comprend un second poste de dépôt (3a) de fluide translucide solidifiable (6) positionné en amont du poste d'impression (1) jet d'encre sur le substrat (5) par rapport au sens de déplacement du substrat dans le système. Ce positionnement particulier du poste de dépôt (3a) du fluide translucide solidifiable (6) d'une part permet de recouvrir le substrat d'une couche de fluide (6) dont l'épaisseur facilite l'adhésion de l'image imprimée au substrat (5) au niveau du poste d'impression (1), et d'autre part permet d'améliorer qualitativement l'impression grâce à une dépose en relief du fluide translucide solidifiable (6), de façon à éviter une évasion de l'encre imprimer (7).According to a second variant embodiment, the system according to the invention comprises a second solidifiable translucent fluid deposition station (3a) (6) positioned upstream of the inkjet printing station (1) on the substrate (5). relative to the direction of displacement of the substrate in the system. This particular positioning of the fluid deposition station (3a) translucent solidifiable (6) on the one hand allows to cover the substrate with a fluid layer (6) whose thickness facilitates the adhesion of the printed image to the substrate (5) at the printing station (1). ), and secondly improves the printing qualitatively through a relief deposit of solidifiable translucent fluid (6), so as to avoid an escape of the printing ink (7).

Dans les deux variantes de réalisation précédemment mentionnées, les dépôts de fluide translucide solidifiable (6) sont réalisés de sorte que l'épaisseur soit variable et permette une suppression de toutes les variations de relief sur la surface du substrat (5) qui résulteraient du dépôt d'encres, par exemple en quadrichromie, lors de l'impression. Par ailleurs, le recouvrement de l'impression d'une couche de fluide translucide solidifiable (8) permet ainsi d'obtenir un substrat (5) imprimé pourvu d'une surface sans relief et donc d'obtenir un produit fini valorisé.In the two previously mentioned embodiments, the solidifiable translucent fluid deposits (6) are made so that the thickness is variable and allows a suppression of all the variations of relief on the surface of the substrate (5) which would result from the deposition. inks, for example in four-color process, when printing. Furthermore, the coating of the printing of a solidifiable translucent fluid layer (8) thus makes it possible to obtain a printed substrate (5) provided with a surface without relief and thus to obtain a valued finished product.

Selon un mode de réalisation particulier, le système selon l'invention intègre un premier poste de dépôt (3b) de fluide translucide solidifiable (8) positionné en aval du poste d'impression (1) jet d'encre sur le substrat (5) et un second poste de dépôt (3a) de fluide translucide solidifiable (6) positionné en amont du poste d'impression (1) jet d'encre.According to one particular embodiment, the system according to the invention integrates a first solidifiable translucent fluid deposition station (3b) (8) positioned downstream of the inkjet printing station (1) on the substrate (5). and a second solidifiable translucent fluid depositing station (3a) positioned upstream of the inkjet printing station (1).

Le second poste de dépôt (3a) de fluide translucide solidifiable (6) permet grâce à un dépôt d'épaisseur variable, de s'affranchir des variations de relief du substrat imprimé, tandis que le premier poste (3b) de fluide translucide solidifiable (8) permet d'opérer un dépôt de finition de la surface du produit. Selon une variante de ce mode de réalisation, chacun de ces postes de dépôt (3a, 3b) de fluide translucide solidifiable (6, 8) est susceptible d'être associé avec un poste de solidification (4a, 4b) respectif.The second deposit station (3a) solidifiable translucent fluid (6) allows through a deposit of varying thickness, to overcome the variations in relief of the printed substrate, while the first station (3b) solidifiable translucent fluid ( 8) makes it possible to make a finishing deposit of the surface of the product. According to a variant of this embodiment, each of these deposition stations (3a, 3b) of solidifiable translucent fluid (6, 8) can be associated with a respective solidification station (4a, 4b).

Selon un mode de réalisation préféré, la variation de l'épaisseur de fluide translucide solidifiable (6) déposée sur le substrat par le second poste de dépôt (3a) est définie à partir d'au moins un paramètre particulier. Ce paramètre est l'image imprimée par le poste d'impression. Le système selon l'invention connecte le poste d'impression avec le ou les postes de dépôt (3a, 3b) de fluide translucide solidifiable, soit directement, soit indirectement via une unité centrale, de sorte qu'un fichier de l'image imprimée ou à imprimer, ou un fichier traité de cette image soit transmis aux postes de dépôt (3a, 3b) de fluide translucide solidifiable. Grâce à un dispositif adapté pour le traitement de l'image imprimée ou à imprimer, une cartographie de la surface du substrat (5) comportant les différentes variations de l'épaisseur de fluide translucide solidifiable à déposer peut être établie pour que la superposition des fluides translucides et des encres d'impression aboutisse à une surface lisse et plane. Le traitement utilisé fait intervenir préférentiellement une première étape de conversion de l'image en monochrome, aussi appelé niveau de gris, et une seconde étape de calcul du négatif de l'image convertie. L'image obtenue après traitement correspond alors au négatif de l'image imprimée convertie en niveau de gris. L'encre translucide déposée sur le substrat selon une cartographie correspondant à l'image obtenue après traitement permet alors de compenser les différences de reliefs du substrat une fois que celui-ci est imprimé.According to a preferred embodiment, the variation of the solidifiable translucent fluid thickness (6) deposited on the substrate by the second deposition station (3a) is defined from at least one particular parameter. This setting is the image printed by the print station. The system according to the invention connects the printing station with the deposition station (s) (3a, 3b) of solidifiable translucent fluid, either directly or indirectly via a central unit, so that a file of the image printed or to be printed , or a processed file of this image is transmitted to the deposition stations (3a, 3b) solidifiable translucent fluid. With a device adapted for processing the printed or printed image, a mapping of the surface of the substrate (5) comprising the different variations of the solidifiable translucent fluid thickness to be deposited can be established so that the superposition of the fluids Translucent and printing inks result in a smooth, flat surface. The processing used preferably involves a first step of conversion of the image into monochrome, also called gray level, and a second step of calculating the negative of the converted image. The image obtained after treatment then corresponds to the negative of the printed image converted into gray level. The translucent ink deposited on the substrate according to a map corresponding to the image obtained after treatment then makes it possible to compensate for the differences in relief of the substrate once it is printed.

Selon un procédé alternatif, cinq fichiers sont extraits de l'image imprimée ou à imprimer. Un premier fichier correspond à une cartographie de l'ensemble des points de l'image imprimée ou à imprimer comprenant l'ensemble des quatre couleurs d'encre d'impression. Un second fichier correspond à une cartographie de l'ensemble des points de l'image imprimée ou à imprimer comprenant seulement trois couleurs d'encre d'impression. Un troisième fichier correspond à une cartographie de l'ensemble des points de l'image imprimée ou à imprimer comprenant uniquement deux couleurs d'encre d'impression. Un quatrième fichier correspond à une cartographie de l'ensemble des points de l'image imprimée ou à imprimer comprenant une seule couleur d'encre d'impression, et un dernier et cinquième fichier correspond à une cartographie de l'ensemble des points de l'image imprimée ou à imprimer qui ne présentent aucune encre d'impression. A partir de ces fichiers extraits, l'épaisseur d'encre translucide à déposer déterminée par le dispositif de traitement est inversement proportionnelle au nombre de couleurs d'encre d'impression utilisé.According to an alternative method, five files are extracted from the printed image or to be printed. A first file corresponds to a map of all the points of the printed or printed image comprising all four colors of printing ink. A second file corresponds to a map of all the points of the printed or printed image comprising only three colors of printing ink. A third file corresponds to a map of all the points of the printed or printed image comprising only two colors of printing ink. A fourth file corresponds to a map of all the points of the printed or printed image comprising a single color of printing ink, and a last and fifth file corresponds to a map of the set of points of the image. printed or printed image that does not have any printing ink. From these extracted files, the translucent ink thickness to be deposited determined by the Processing device is inversely proportional to the number of colors of printing ink used.

Les étapes de traitement de l'image imprimée ou à imprimer sont opérées dans un dispositif adapté comportant des éléments de calcul, de conversion et/ou de traitement appropriés pour la réalisation de ces étapes. Ce dispositif adapté se trouve positionné soit dans une unité centrale qui gère la réalisation du produit fini en étant connecté à plusieurs des postes (1, 2, 3a, 3b, 4a, 4b) du système, soit au niveau des postes concernés du système.The processing steps of the printed or printed image are performed in a suitable device comprising calculation, conversion and / or processing elements suitable for carrying out these steps. This adapted device is positioned either in a central unit that manages the production of the finished product by being connected to several of the stations (1, 2, 3a, 3b, 4a, 4b) of the system, or at the relevant stations of the system.

Selon un mode de réalisation préféré, le procédé utilisé pour obtenir le produit fini valorisé de l'invention fait également intervenir un facteur d'étalement du fluide translucide solidifiable sur l'encre d'impression, postérieurement au dépôt de l'encre d'impression. La conservation de cet effet lors du procédé permet d'aboutir à un produit fini dont la surface obtenue est lisse et brillante. Ce phénomène physique peut être ralenti, voire stoppé grâce aux postes de solidification (4a, 4b) qui en rigidifiant l'encre translucide déposée, augmente les tensions de surface et supprime cette possibilité d'étalement. En empêchant le phénomène d'étalement, la solidification du fluide translucide solidifiable comporte alors comme avantage d'obtenir un produit fini dont la surface est matte et satiné. La présence ou l'absence de solidification est donc particulièrement importante pour déterminer la finition de la surface du substrat (5) imprimé.According to a preferred embodiment, the process used to obtain the upgraded finished product of the invention also involves a spreading factor of the translucent fluid solidifiable on the printing ink, after the deposition of the printing ink. . The preservation of this effect during the process leads to a finished product whose surface is smooth and shiny. This physical phenomenon can be slowed or stopped by the solidification stations (4a, 4b) which stiffens the deposited translucent ink, increases the surface tension and eliminates this possibility of spreading. By preventing the phenomenon of spreading, the solidification of the solidifiable translucent fluid then has the advantage of obtaining a finished product whose surface is matte and satin. The presence or absence of solidification is therefore particularly important for determining the surface finish of the printed substrate (5).

Par ailleurs, lorsque cette étape de solidification est effectuée par le poste adapté (4a) préalablement à l'étape d'impression de l'image sur la surface du substrat, le relief obtenu par les variations d'épaisseur d'encre translucide déposée est plus facilement maintenu pour permettre une compensation du relief réalisé par le dépôt d'encre (7) lors de l'étape d'impression (1).Moreover, when this step of solidification is carried out by the adapted station (4a) prior to the step of printing the image on the surface of the substrate, the relief obtained by the translucent ink thickness variations deposited is more easily maintained to allow compensation of the relief achieved by the ink deposition (7) during the printing step (1).

Le dépôt variable (3a) de fluide translucide solidifiable (6) sur le substrat (5) peut être réalisé selon deux modes opératoires différents représentés sur les figures 2 et 3.The variable deposition (3a) of solidifiable translucent fluid (6) on the substrate (5) can be carried out according to two different operating modes represented on the Figures 2 and 3 .

Selon un premier mode opératoire représenté sur la figure 2, le second poste de dépôt (3a) de fluide translucide (6) effectue un dépôt du fluide de sorte que la superposition de la couche de fluide (6) déposé et des différentes couches (c1, c2, c3, c4) d'encres (7) d'impression aux points considérés aboutisse à une épaisseur identique sur toute la surface du substrat (5) imprimé. Les variations d'épaisseur de fluide translucide (6) déposé forment ainsi plusieurs zones de dépôt préparées pour recevoir un nombre prédéterminé de couches (c1, c2, c3, c4) d'encres (7) d'impression. Les zones de la surface du substrat (5) destinées à ne pas être pourvues d'encre présentent ainsi l'épaisseur de fluide translucide la plus importante. Inversement, les zones pourvues des quatre couleurs d'encre d'impression en quadrichromie présentent l'épaisseur de fluide (6) la plus faible, voire nulle. L'image obtenue lors du dépôt du fluide translucide solidifiable (6) correspond alors au négatif de l'image imprimée, ou destinée à être imprimée, convertie en niveau de gris et permet ainsi de compenser les différences de reliefs du substrat une fois que celui-ci est imprimé. Après impression, la surface uniforme du substrat (5) imprimé peut alors être recouverte d'une couche supplémentaire uniforme (8) de fluide translucide solidifiable par le premier poste de dépôt (3b).According to a first operating mode represented on the figure 2 , the second translucent fluid deposition station (3a) (6) performs a deposition of the fluid so that the superposition of the fluid layer (6) deposited and the various layers (c1, c2, c3, c4) of inks (7) printing at the points considered leads to an identical thickness over the entire surface of the substrate (5) printed. The translucent fluid thickness variations (6) deposited thus form several deposition zones prepared to receive a predetermined number of layers (c1, c2, c3, c4) of printing inks (7). The areas of the surface of the substrate (5) that are not provided with ink thus have the largest translucent fluid thickness. Conversely, the areas provided with the four colors of four-color printing ink have the lowest (or even zero) fluid thickness (6). The image obtained during the deposition of the solidifiable translucent fluid (6) then corresponds to the negative of the printed image, or intended to be printed, converted into gray level and thus makes it possible to compensate for the differences in relief of the substrate once the it is printed. After printing, the uniform surface of the printed substrate (5) can then be covered with a uniform additional layer (8) of translucent fluid solidifiable by the first deposition station (3b).

Selon un second mode opératoire représenté sur la figure 3, le second poste de dépôt (3a) de fluide translucide (6) effectue un dépôt du fluide de sorte que l'épaisseur de la couche de fluide (6) déposé est proportionnelle au nombre de couches (c1, c2, c3, c4) d'encres (7) d'impression aux points considérés, indépendamment de l'épaisseur finale cumulant l'épaisseur du fluide déposé et l'épaisseur des différentes couches (c1, c2, c3, c4) d'encres (7) d'impression. Les variations d'épaisseur de la couche de fluide (6) déposée forment alors un relief amplifié après l'étape de dépôt de l'encre d'impression (7). La suppression de ce relief pour l'obtention d'une surface uniforme est obtenue par le dépôt d'une seconde couche de fluide translucide solidifiable (8) par le premier poste de dépôt (3b), qui compense les variations de relief sur la surface du substrat (5) imprimé.According to a second operating mode represented on the figure 3 the second translucent fluid deposition station (3a) performs a fluid deposition so that the thickness of the deposited fluid layer (6) is proportional to the number of layers (c1, c2, c3, c4) of printing inks (7) at the points considered, regardless of the final thickness accumulating the thickness of the deposited fluid and the thickness of the various layers (c1, c2, c3, c4) of inks (7) of impression. The variations in thickness of the deposited fluid layer (6) then form an enhanced relief after the step of depositing the printing ink (7). The removal of this relief for obtaining of a uniform surface is obtained by the deposition of a second solidifiable translucent fluid layer (8) by the first deposition station (3b), which compensates for relief variations on the surface of the printed substrate (5).

Dans les deux modes opératoires détaillés, la variation d'épaisseur de fluide translucide solidifiable (6) déposé permet de définir les différentes zones d'encrage en fonction du nombre de couches d'encre déposées. Le dépôt de cette couche de fluide étant généralement suivi d'une solidification du fluide, l'encre d'impression (7) qui se trouve ensuite déposée présente un étalement et une évasion qui se trouve réduite, voire supprimée, du fait de la tension de surface importante (entre 15 et 28 mN/m) du fluide qui compartimente les zones d'impression en fonction du nombre de couches (c1, c2, c3, c4) d'encres (7) déposées.In the two detailed operating modes, the variation of solidifiable translucent fluid thickness (6) deposited makes it possible to define the various inking zones as a function of the number of deposited ink layers. The deposition of this fluid layer being generally followed by solidification of the fluid, the printing ink (7) which is then deposited has a spreading and evasion which is reduced or even eliminated due to the tension large area (between 15 and 28 mN / m) of the fluid that compartmentalizes the printing areas according to the number of layers (c1, c2, c3, c4) of inks (7) deposited.

Il doit être évident pour les personnes versées dans l'art que la présente invention permet des modes de réalisation sous de nombreuses autres formes spécifiques sans l'éloigner du domaine d'application de l'invention comme revendiqué. Par conséquent, les présents modes de réalisation doivent être considérés à titre d'illustration mais peuvent être modifiés dans le domaine défini par la portée des revendications jointes.It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed. Therefore, the present embodiments should be considered by way of illustration but may be modified in the field defined by the scope of the appended claims.

Claims (15)

Système d'impression à jet pour l'obtention d'un produit fini comportant : - un poste d'impression par des buses à jet utilisant de l'encre liquide d'impression pour impression à jet d'encre d'au moins une image sur la surface d'un substrat adapté,
caractérisé en ce que le système comprend également : - au moins un premier poste de dépôt par des buses à jet d'une épaisseur variable d'un fluide translucide solidifiable sur la surface du substrat, l'épaisseur étant contrôlée par un moyen de contrôle, pour supprimer toutes les variations de relief sur la surface du substrat qui résulteraient du dépôt d'encres lors de l'impression et obtenir un produit fini sans relief, le poste de dépôt d'un fluide translucide solidifiable étant positionné en amont du poste de séchage de l'image imprimée par rapport au sens de déplacement du substrat dans le système. Jet printing system for obtaining a finished product comprising: a jet jet printing station using liquid printing ink for inkjet printing of at least one image on the surface of a suitable substrate,
characterized in that the system further comprises: at least one first deposition station by jet nozzles of variable thickness of a translucent fluid solidifiable on the surface of the substrate, the thickness being controlled by a control means, to eliminate all the variations of relief on the substrate surface that would result from the deposition of inks during printing and obtain a finished product without relief, the solidifiable translucent fluid deposition station being positioned upstream of the drying station of the printed image relative to the direction of displacement of the substrate in the system. Système d'impression à jet pour l'obtention d'un produit fini selon la revendication précédente, caractérisé en ce que le système comprend des moyens de commande du dépôt de fluide translucide solidifiable contrôlés par un dispositif de traitement prenant en compte d'une part les zones non pourvues d'encre et d'autre part le nombre de couleurs dans les zones pourvues d'encre, pour déterminer l'épaisseur de la couche de fluide déposée dans la zone considérée de façon à obtenir la même épaisseur dans les zones pourvues d'encre et non pourvues d'encre.Jet printing system for obtaining a finished product according to the preceding claim, characterized in that the system comprises solidifiable translucent fluid deposition control means controlled by a processing device taking into account on the one hand areas not provided with ink and, secondly, the number of colors in the areas provided with ink, for determining the thickness of the layer of fluid deposited in the area in question so as to obtain the same thickness in the zones provided with of ink and not provided with ink. Système d'impression à jet pour l'obtention d'un produit fini selon la revendication précédente, caractérisé en ce que le système comprend des moyens de commande du dépôt de fluide translucide solidifiable contrôlés par un dispositif de traitement de l'image imprimée ou à imprimer comprend un élément de conversion de l'image en niveau de gris et un élément de calcul du négatif de l'image convertie.Jet printing system for obtaining a finished product according to the preceding claim, characterized in that the system comprises solidifiable translucent fluid deposition control means controlled by a printed image processing device or by print includes a grayscale image conversion element and an image calculation element of the converted image negative. Système d'impression à jet pour l'obtention d'un produit fini selon une des revendications 1 à 2, caractérisé en ce que le système d'impression comprend un second poste de dépôt, dans une zone, d'une épaisseur de fluide translucide solidifiable contrôlée proportionnellement à l'épaisseur d'encre qui sera déposée ultérieurement dans la zone, ce poste étant positionné en amont du poste d'impression de l'image sur le substrat par rapport au sens de déplacement du substrat dans le système.A jet printing system for obtaining a finished product according to one of claims 1 to 2, characterized in that the printing system comprises a second deposition station, in a zone, of a translucent fluid thickness solidifiable controlled proportionally to the thickness of ink that will be deposited later in the area, this position being positioned upstream of the printing station of the image on the substrate relative to the direction of movement of the substrate in the system. Système d'impression à jet pour l'obtention d'un produit fini selon une des revendications précédentes, caractérisé en ce que le premier poste de dépôt de fluide translucide solidifiable est positionné entre le poste d'impression de l'image sur le substrat et le poste de séchage de l'image imprimée sur la surface du substrat.A jet printing system for obtaining a finished product according to one of the preceding claims, characterized in that the first solidifiable translucent fluid deposition station is positioned between the printing station of the image on the substrate and the drying station of the image printed on the surface of the substrate. Système d'impression à jet pour l'obtention d'un produit fini selon une des revendications précédentes, caractérisé en ce que le système comprend un dispositif de traitement de l'image imprimée ou à imprimer par le poste d'impression de façon à déterminer une variation de l'épaisseur de fluide translucide solidifiable déposé par au moins un poste de dépôt en fonction de l'image imprimée ou à imprimer.A jet printing system for obtaining a finished product according to one of the preceding claims, characterized in that the system comprises an image processing device which is printed or to be printed by the printing station so as to determine a variation of the solidifiable translucent fluid thickness deposited by at least one deposition station as a function of the printed or printed image. Système d'impression à jet pour l'obtention d'un produit fini selon une des revendications précédentes, caractérisé en ce que les buses à jet du système sont arrangés en rampe et commandées sélectivement en fonction du fichier de l'image imprimée ou à imprimer ou en fonction du fichier image négatives de cette image.A jet printing system for obtaining a finished product according to one of the preceding claims, characterized in that the jet nozzles of the system are arranged in a ramp and selectively controlled according to the file of the printed or printed image or depending on the negative image file of this image. Système d'impression à jet pour l'obtention d'un produit fini selon une des revendications précédentes, caractérisé en ce que les buses à jet du système sont arrangées pour déposer un fluide translucide solidifiable présentant une tension de surface comprise 15 et 28 mN/m à 23°C.A jet printing system for obtaining a finished product according to one of the preceding claims, characterized in that the jet nozzles of the system are arranged to deposit a solidifiable translucent fluid having a surface tension of 15 and 28 mN / m at 23 ° C. Procédé d'impression à jet pour l'obtention d'un produit fini dont la surface est exemptée des traitements de l'art antérieur comportant : - une étape d'impression par de l'encre d'impression d'au moins une
image sur la surface d'un substrat adapté,
caractérisé en ce que le procédé comprend également : - au moins une étape de dépôt d'une épaisseur variable d'un fluide translucide solidifiable, l'épaisseur étant contrôlée par un moyen de contrôle, pour supprimer toutes les variations de relief sur la surface du substrat qui résulteraient du dépôt d'encres lors de l'impression et obtenir un produit fini sans relief, sur la surface du substrat positionné avant l'étape de séchage de l'image imprimée. A jet printing method for obtaining a finished product whose surface is exempted from the treatments of the prior art comprising: a step of printing with printing ink of at least one
image on the surface of a suitable substrate,
characterized in that the method further comprises: at least one deposition step of variable thickness of a solidifiable translucent fluid, the thickness being controlled by a control means, to eliminate all the variations of relief on the surface of the substrate which would result from the deposition of inks during of printing and obtain a finished product without relief, on the surface of the substrate positioned before the step of drying the printed image. Procédé d'impression à jet pour l'obtention d'un produit fini selon la revendication précédente, caractérisé en ce qu'une étape de dépôt d'une épaisseur variable de fluide translucide solidifiable précède l'étape d'impression de l'image sur le substrat.A jet printing method for obtaining a finished product according to the preceding claim, characterized in that a step of depositing a variable thickness of solidifiable translucent fluid precedes the step of printing the image on the substrate. Procédé d'impression à jet pour l'obtention d'un produit fini selon une des revendications 9 à 10, caractérisé en ce que l'étape de dépôt d'une épaisseur variable de fluide translucide solidifiable est effectuée à la suite de l'impression de l'image sur le substrat et précède l'étape de séchage de l'image imprimée sur la surface du substrat.A jet printing method for obtaining a finished product according to one of claims 9 to 10, characterized in that the step of depositing a variable thickness of solidifiable translucent fluid is carried out following the printing of the image on the substrate and precedes the step of drying the printed image on the surface of the substrate. Procédé d'impression à jet pour l'obtention d'un produit fini selon une des revendications 9 à 11, caractérisé en ce que le procédé comprend une étape de traitement de l'image imprimée ou à imprimer lors de l'étape d'impression de façon à définir une variation de l'épaisseur de fluide translucide solidifiable déposée au cours d'au moins une étape de dépôt d'encre en fonction de l'image imprimée ou à imprimer.A jet printing method for obtaining a finished product according to one of claims 9 to 11, characterized in that the method comprises a step of processing the printed or printed image during the printing step in order to define a variation of the solidifiable translucent fluid thickness deposited during at least one ink deposition step as a function of the printed or printed image. Procédé d'impression à jet pour l'obtention d'un produit fini selon la revendication 12, caractérisé en ce que l'étape de traitement prend en compte d'une part les zones non pourvues d'encre et d'autre part le nombre de couleurs dans les zones pourvues d'encre, pour déterminer l'épaisseur de la couche de fluide déposée dans la zone considérée de façon à obtenir la même épaisseur dans les zones pourvues d'encre et non pourvues d'encre.A jet printing method for obtaining a finished product according to claim 12, characterized in that the processing step takes into account, on the one hand, the non-ink-filled areas and, on the other hand, the number of color in the ink-filled areas to determine the thickness of the fluid layer deposited in the area of interest so as to obtain the same thickness in the areas provided with ink and not provided with ink. Procédé d'impression à jet pour l'obtention d'un produit fini selon la revendication 12, caractérisé en ce que l'étape de traitement de l'image imprimée ou à imprimer comprend une étape de conversion de l'image en niveau de gris et une étape de calcul du négatif de l'image convertie.A jet printing method for obtaining a finished product according to claim 12, characterized in that the step of processing the printed or printed image comprises a step of converting the image into a gray level and a step of calculating the negative of the converted image. Procédé d'impression à jet pour l'obtention d'un produit fini selon une des revendications 9 à 14, caractérisé en ce qu'au moins une étape de solidification du fluide translucide solidifiable déposé succède à chaque étape de dépôt d'un fluide translucide solidifiable.Jet printing process for obtaining a finished product according to one of Claims 9 to 14, characterized in that at least one step of solidification of the deposited solidifiable translucent fluid succeeds each step of depositing a translucent fluid. solidifiable.
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FR2952583A1 (en) 2011-05-20
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