EP3122571B1 - Gilding method and system - Google Patents

Gilding method and system Download PDF

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Publication number
EP3122571B1
EP3122571B1 EP15711225.1A EP15711225A EP3122571B1 EP 3122571 B1 EP3122571 B1 EP 3122571B1 EP 15711225 A EP15711225 A EP 15711225A EP 3122571 B1 EP3122571 B1 EP 3122571B1
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EP
European Patent Office
Prior art keywords
gilding
substrate
film
pressure
areas
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EP15711225.1A
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German (de)
French (fr)
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EP3122571A1 (en
Inventor
Edmond Abergel
Raphael Renaud
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MGI Digital Technology SA
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MGI Digital Technology SA
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Priority to PL15711225T priority Critical patent/PL3122571T3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F16/00—Transfer printing apparatus
    • B41F16/0006—Transfer printing apparatus for printing from an inked or preprinted foil or band
    • B41F16/002—Presses of the rotary type
    • B41F16/0026—Presses of the rotary type with means for applying print under heat and pressure, e.g. using heat activable adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41G—APPARATUS FOR BRONZE PRINTING, LINE PRINTING, OR FOR BORDERING OR EDGING SHEETS OR LIKE ARTICLES; AUXILIARY FOR PERFORATING IN CONJUNCTION WITH PRINTING
    • B41G1/00—Apparatus for bronze printing or for like operations
    • B41G1/04—Apparatus for bronze printing or for like operations cylinder type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/10—Applying flat materials, e.g. leaflets, pieces of fabrics
    • B44C1/14—Metallic leaves or foils, e.g. gold leaf

Definitions

  • the present invention relates to the field of personalization devices for substrates.
  • the invention relates in particular to a method and / or a system for personalizing a substrate, according to claims 1 and 8, by the deposition of an additional coating (or material), generally called “gilding" of a substrate.
  • the present invention relates in particular to a printing method comprising an inkjet substrate printing step followed by a step of "gilding" by contact between the zones of the substrate to be gilded and a deposition device of "Gilding", such as a gilding leaf.
  • the printed substrate gilding techniques are well known to those skilled in the art.
  • the basic principle of this technique lies in the fact of depositing an additional coating (ie, gilding or material) on the substrate, by a device for depositing "gilding", for example by applying / pressing a sheet (carrying said coating or gilding) on selected areas of the substrate so as to adhere to the selected areas the desired portion of the sheet.
  • This technique may for example comprise an adhesive deposit on the substrate in a predetermined pattern before the deposition of the personalization coating (for example the gilding foil) on the adhesive deposited on the substrate.
  • the deposition of the adhesive can be accomplished by one or more techniques, such as, for example, inkjet printing, toner-based printing, screen printing, or offset printing.
  • the present invention relates in particular to ink jet printing techniques in relief, for example using piezoelectric printing heads, adapted according to the ink and / or printing varnish used. .
  • WO2011110956 which, in its embodiment represented by its figure 2 , discloses a cold gilding system comprising a pressing system 200 and, upstream of this pressing system, a printing section comprising a printing device 210 (for example, an ink jet printer) for depositing a deposition pattern consisting of an adhesive layer 222, on a substrate 220.
  • a printing device 210 for example, an ink jet printer
  • the adhesive is cured and becomes tacky, which allows the sheet to adhere to the predetermined pattern .
  • the pressing is carried out by means of one or more nip rollers (260) also called pressure rolls. This pressurization is carried out on the whole of the gilding sheet.
  • the gilding technique is generally optimized so as to favor better performance of adhesion of the gilding sheet to the substrate while improving the visual quality of the deposit of gilding on the substrate.
  • the Applicant has found that it was very difficult to reconcile these two conditions with known gilding techniques.
  • One of the objectives of the present invention is therefore to provide a gilding technique that promotes better performance of adhesion of the gilding sheet to the substrate while improving the visual quality of the deposition of gilding on the substrate.
  • the present invention therefore aims at least to overcome this major drawback of the prior art.
  • a method of gilding a substrate by pressurizing between the zones of the substrate to be gilded and a gilding foil comprising a gilding film and a transport layer, characterized in that the step of pressurizing and deposition of the gilding film is followed by a step pressurizing the areas of the substrate covered with gilding film. This additional and subsequent pressurizing step is therefore performed after separation of the gilding film from the transport layer of the sheet.
  • FIGS. 1 and 2 illustrate a gilding technique according to the prior art.
  • the Fig. 3 illustrates a gilding technique according to a certain embodiment of the present invention.
  • the basic advantage of the present invention is that the preferred debugging parameters of the first pressurization can be set independently from those of the second pressurization step.
  • the Applicant has discovered Unexpectedly, this made it possible to optimize both the adhesion performance of the gilding foil on the substrate while improving the visual quality of the deposition of gilding on the substrate.
  • the present invention is described in an illustrative manner and according to one of its embodiments in the figure 3 . It can be seen on the left side of the figure, a pressure group according to the present invention and which is downstream of the gilding group shown on the right side of the figure. The substrate moves from right to left.
  • the pressure group consists of at least two motorized rollers, installed facing each other, rotating in the opposite direction, and whose distance is adjustable so as to adapt to different thicknesses of substrates; according to a preferred embodiment of the present invention, this adjustment will take into account not only the thickness of the substrate but also the thickness of the ink and / or varnish previously printed on the substrate as well as optionally all the thicknesses added to the substrate during steps of treatment of the substrate preceding the gilding and also optionally taking into account the thicknesses of the films of the gilding sheet deposited by the group (s) of gilding.
  • the spacing between the rollers vis-à-vis can be motorized and dynamically controlled.
  • the surface of the upper roll is different from that of the lower roll; in particular, the surface of the upper roll is more compressible than that of the lower roll.
  • the upper roller has on the surface a compressible material allowing it to match the shape of the deposit of gilding while the lower roller will be made of a harder material, for example incompressible.
  • the upper roller comprises a heating device which improves the resistance of the gilding; for example, this heating device can be advantageously used when the gilding film is coated with varnish because the heating allows the softening of said varnish.
  • the pressure unit operates with a linear speed (roller surface) greater than or equal to that of the gilding group so as not to slow down the machine.
  • the distance between the gilding group and the pressure group is greater than the maximum length of the treated substrates.
  • a feature of the present invention is that it makes it possible to carry out a step of treating the gilding film by the pressure group which controls this step of independently of the deposition step which is controlled by the gilding group; this thus makes it possible to optimize both the adhesion performance of the gilding foil on the substrate while improving the visual quality of the deposition of gilding on the substrate.
  • adjustable pressure for example from 1 to 10 bars, preferably with an operating pressure greater than 1 bar
  • adjustable speed for example an operating pressure of at most 250 ° C, for example between 50 and 240 ° C, preferably between 140 and 220 ° C, for example 180 ° C
  • adjustable temperature for example an operating temperature of at most 250 ° C, for example between 50 and 240 ° C, preferably between 140 and 220 ° C, for example 180 ° C
  • hardness of the coating of the upper roller between 50 and 95 Shore A.
  • the improvement provided by the present invention has been demonstrated in the laboratory by the Applicant through the tests carried out in terms of quality of holding gilding as well as making direct visual comparisons between various samples.
  • the quality of holding of the gilding was carried out by means of the "scotch" test: the gilding deposited is previously scarified with the aid of a cutter, a piece of Scotch is pressed on the gilding then strongly ripped; if the adhesive does not remove the gilding, its adhesion is considered satisfactory.
  • the substrate can be selected from a large number of materials and not be considered as limited to materials frequently used in standard printing and / or personalization devices such as paper, cardboard and plastic substrates.
  • Non-limiting examples are metal, paper, nonwoven fabric, plastic, for example a methacrylic copolymer resin, polyester, polycarbonate, polyethylene, polypropylene, polystyrene and / or chloride.
  • polyvinyl, or even cellulosic materials such as, for example, wood, plywood, or crystalline materials such as glass or ceramics, for example.
  • the invention therefore also applies to any combination of these materials, such as complex materials comprising one or more of these components such as milk bricks.
  • the substrate (sheet, card, etc.) is generally in a rectangular or square shape.
  • This sheet moves, generally through a substrate transport system in a printing machine, along a transport path oriented along a longitudinal axis from at least one input magazine providing the printable substrates and / or customizable, up to at least one output store receiving the printed and / or customized substrates.
  • the "lateral edges" of the substrate are therefore the two edges located on either side of this longitudinal axis; the front and / or back edges are its transverse edges.
  • the present invention relates to a method and / or a gilding system.
  • the present invention also relates to a method and / or a printing system comprising a gilding of the substrate.
  • Any gilding technique adapted to the process of the present invention can be used.
  • the cold foil technique also known as "cold foil transfer" is used.
  • a gilding sheet (which is therefore part of the gilding device) is pressed against the areas of the printed substrate requiring the deposition of said gilding.
  • This contact between the gilding foil and the substrate is generally carried out by means of two rollers between which the substrate and the gilding foil are brought into contact.
  • an adhesive is preferably used.
  • This glue can be either positioned on the printed areas (before applying the gilding), or be an integral part of the gilding sheet itself.
  • a gilding sheet is used which incorporates a film of glue (which will be pressed against the zones to be gilded) and is applied in advance a glue (the same or different) on the printed areas (before applying gilding).
  • an ink and / or a varnish used for printing can already give areas to be coated with gilding an adhesive property; the latter option is particularly advantageous because it avoids adding glue on the areas to be browned and / or using gilding sheets without adhesive film.
  • the gilding technique may also comprise an activation step (for example by means of UV rays) making it possible to crosslink the ink and / or the varnish and / or the glue and thus improving the adhesion between the gilding foil and the raised areas of the substrate.
  • an activation step for example by means of UV rays
  • the words "gilding” and “gilding” used in the present invention are not limited to the use of gold leaf and that any “gilding” device may be employee.
  • These terms cover all types of decorative sheets (sometimes also called foils) among which may be mentioned as illustrative and non-limiting examples, aluminum, chromium, gold, silver, copper or even optically active metal salts.
  • a gilding foil pressed against the substrate to be customized is used, and the present application thus designates by this term the general use of a gilding device.
  • the gilding sheets used in the context of the present invention are generally provided in the form of a roll of width substantially equivalent to the transverse dimension of the substrate.
  • the printing method according to the present invention generally relates to an ink jet substrate printing which highlights areas to be coated with a gilding sheet.
  • Ink jet printing is well known to those skilled in the art.
  • the zones can be all kinds of shapes, for example points, letters and / or any other geometric shapes. They may be made of different materials, for example inks and / or varnish. They may also be covered with a layer of material, for example covered with glue, before the gilding step; however, according to some embodiments of the present invention, the gilding step is carried out directly on the ink and / or the inkjet coated varnish.
  • the relief of said zones intended to be covered with a gilding foil preferably represents a thickness of the order of one micron, preferably greater than five microns, or even greater than ten microns.
  • This thickness - of any material previously deposited on the substrate; for example, varnish and / or ink - is generally less than one millimeter for relief printing.
  • the present invention could also be applied to substrates that have been printed by 3D technology by means of inkjet printing (and / or varnish) in successive layers and thus having thicknesses of up to several centimeters, for example less than 2 cm.
  • the present invention also relates to at least one device (or system) for printing and / or personalization comprising means for implementing at least one of the methods described in the present application. Thanks to the functional considerations provided in the present application, it is understood that such systems or devices comprise means for performing the functions described with reference to the method and that it is not necessary to detail these means.

Description

La présente invention concerne le domaine des dispositifs de personnalisation de substrats. Ainsi, l'invention concerne notamment un procédé et/ou un système de personnalisation de substrat, selon les revendications 1 et 8,
par le dépôt d'un revêtement (ou matière) additionnel, généralement appelé « dorure » d'un substrat. En particulier, la présente invention concerne notamment un procédé d'impression comprenant une étape d'impression de substrat par jet d'encre suivie d'une étape de « dorure » par contact entre les zones du substrat à dorer et un dispositif de dépôt de « dorure », tel qu'une feuille de dorure.The present invention relates to the field of personalization devices for substrates. Thus, the invention relates in particular to a method and / or a system for personalizing a substrate, according to claims 1 and 8,
by the deposition of an additional coating (or material), generally called "gilding" of a substrate. In particular, the present invention relates in particular to a printing method comprising an inkjet substrate printing step followed by a step of "gilding" by contact between the zones of the substrate to be gilded and a deposition device of "Gilding", such as a gilding leaf.

Les techniques de dorure de substrat imprimé sont bien connues de l'homme du métier. Le principe de base de cette technique repose sur le fait de déposer un revêtement additionnel (i.e., dorure ou matière) sur le substrat, par un dispositif de dépôt de « dorure », par exemple en appliquant/pressant une feuille (portant ledit revêtement ou dorure) sur des zones sélectionnées du substrat de manière à faire adhérer aux zones sélectionnées la partie désirée de la feuille. Cette technique peut par exemple comporter un dépôt d'adhésif sur le substrat selon un motif prédéterminé avant le dépôt du revêtement de personnalisation (par exemple la feuille de dorure) sur l'adhésif déposé sur le substrat. Le dépôt de l'adhésif peut se faire au moyen d'une ou plusieurs techniques, comme par exemple l'impression par jet d'encre, l'impression à base de toner, la sérigraphie ou l'impression offset.The printed substrate gilding techniques are well known to those skilled in the art. The basic principle of this technique lies in the fact of depositing an additional coating (ie, gilding or material) on the substrate, by a device for depositing "gilding", for example by applying / pressing a sheet (carrying said coating or gilding) on selected areas of the substrate so as to adhere to the selected areas the desired portion of the sheet. This technique may for example comprise an adhesive deposit on the substrate in a predetermined pattern before the deposition of the personalization coating (for example the gilding foil) on the adhesive deposited on the substrate. The deposition of the adhesive can be accomplished by one or more techniques, such as, for example, inkjet printing, toner-based printing, screen printing, or offset printing.

La présente invention se rapporte en particulier aux techniques d'impression par jet d'encre en relief, par exemple à l'aide de têtes d'impression piézo-électriques, adaptées en fonction de l'encre et/ou vernis d'impression utilisé.The present invention relates in particular to ink jet printing techniques in relief, for example using piezoelectric printing heads, adapted according to the ink and / or printing varnish used. .

Les feuilles de dorure utilisées dans le cadre de la présente invention sont constituées de plusieurs pellicules superposées comprenant à titre d'exemple non limitatif:

  • une pellicule optionnelle d'adhésif,
  • au moins une pellicule de dorure,
  • une pellicule optionnelle de protection,
  • une pellicule optionnelle de décollement, et
  • au moins une couche dite de transport qui permet le transport de la feuille de dorure.
The gilding sheets used in the context of the present invention consist of several superimposed films comprising, by way of nonlimiting example:
  • an optional film of adhesive,
  • at least one film of gilding,
  • an optional protective film,
  • an optional release film, and
  • at least one so-called transport layer which allows the transport of the gilding foil.

Il est connu de l'art antérieur diverses solutions de personnalisation de substrat par dorure et notamment la demande WO2011110956 qui, dans son mode de réalisation représenté par sa figure 2, décrit un système de dorure à froid comprenant un système de pressage 200 et, en amont de ce système de pressage, une section d'impression comprenant un dispositif d'impression 210 (par exemple, une imprimante à jet d'encre) pour déposer un motif de dépôt constitué d'une couche de colle 222, sur un substrat 220. Après le pressage d'une feuille sur le substrat, l'adhésif est durci et devient collant, ce qui permet à la feuille d'adhérer au motif préétabli. Le pressage s'effectue au moyen d'un ou plusieurs rouleaux de pincement (260) également appelés cylindres de pression. Cette mise en pression s'effectue sur l'ensemble de la feuille de dorure.It is known from the prior art various solutions for customizing the substrate by gilding and in particular the application WO2011110956 which, in its embodiment represented by its figure 2 , discloses a cold gilding system comprising a pressing system 200 and, upstream of this pressing system, a printing section comprising a printing device 210 (for example, an ink jet printer) for depositing a deposition pattern consisting of an adhesive layer 222, on a substrate 220. After pressing a sheet on the substrate, the adhesive is cured and becomes tacky, which allows the sheet to adhere to the predetermined pattern . The pressing is carried out by means of one or more nip rollers (260) also called pressure rolls. This pressurization is carried out on the whole of the gilding sheet.

La technique de dorure est généralement optimisée de manière à favoriser de meilleures performances d'accroche de la feuille de dorure sur le substrat tout en améliorant la qualité visuelle du dépôt de dorure sur le substrat. Malgré l'évolution et la précision des techniques de dorure, la Demanderesse a constaté qu'il était très difficile de concilier ces deux conditions avec les techniques de dorure connues. Un des objectifs de la présente invention consiste donc à fournir une technique de dorure qui favorise de meilleures performances d'accroche de la feuille de dorure sur le substrat tout en améliorant la qualité visuelle du dépôt de dorure sur le substrat.The gilding technique is generally optimized so as to favor better performance of adhesion of the gilding sheet to the substrate while improving the visual quality of the deposit of gilding on the substrate. Despite the evolution and precision of gilding techniques, the Applicant has found that it was very difficult to reconcile these two conditions with known gilding techniques. One of the objectives of the present invention is therefore to provide a gilding technique that promotes better performance of adhesion of the gilding sheet to the substrate while improving the visual quality of the deposition of gilding on the substrate.

La présente invention vise donc au moins à pallier à cet inconvénient majeur de l'art antérieur.The present invention therefore aims at least to overcome this major drawback of the prior art.

Ce but est atteint par un procédé de dorure d'un substrat, selon la revendication 1,
par mise en pression entre les zones du substrat à dorer et une feuille de dorure comprenant une pellicule de dorure et une couche de transport caractérisé en ce que l'étape de mise en pression et dépôt de la pellicule de dorure est suivie d'une étape de mise en pression des zones du substrat recouverts de pellicule de dorure. Cette étape additionnelle et consécutive de mise en pression s'effectue donc après séparation de la pellicule de dorure de la couche de transport de la feuille.This object is achieved by a method of gilding a substrate, according to claim 1,
by pressurizing between the zones of the substrate to be gilded and a gilding foil comprising a gilding film and a transport layer, characterized in that the step of pressurizing and deposition of the gilding film is followed by a step pressurizing the areas of the substrate covered with gilding film. This additional and subsequent pressurizing step is therefore performed after separation of the gilding film from the transport layer of the sheet.

Les figures 1 et 2 illustrent une technique de dorure selon l'art antérieur.The Figures 1 and 2 illustrate a gilding technique according to the prior art.

La figure. 3 illustre une technique de dorure selon un certain mode de réalisation de la présente invention.The Fig. 3 illustrates a gilding technique according to a certain embodiment of the present invention.

La mise en pression entre les zones du substrat à dorer et une feuille de dorure comprenant une pellicule de dorure et une couche de transport peut être effectuée selon toute méthode appropriée. A titre illustratif, on citera l'utilisation

  • d'un ou plusieurs ensembles de rouleaux de pincement tels que décrits dans la figure 1 ;
  • d'un ou plusieurs rouleaux de pression tels que décrits dans la figure 2.
The pressurization between the zones of the substrate to be gilded and a gilding foil comprising a gilding film and a transport layer may be carried out by any appropriate method. By way of illustration, mention may be made of the use
  • one or more sets of pinch rollers as described in the figure 1 ;
  • of one or more pressure rollers as described in the figure 2 .

Ensuite, quand la feuille de dorure a été mise en pression sur le substrat et que la pellicule de dorure a été déposée sur le substrat et donc détachée de la couche de transport, on procède à une seconde étape de mise en pression des zones du substrat recouvertes de pellicule de dorure selon toute méthode appropriée. A titre illustratif, on citera l'utilisation

  • d'un ou plusieurs ensembles de rouleaux de pincement tels que décrits dans la figure 1 ;
  • d'un ou plusieurs rouleaux de pression tels que décrits dans la figure 2.
Then, when the gilding sheet has been pressurized on the substrate and the gilding film has been deposited on the substrate and thus detached from the transport layer, a second step of pressurizing the zones of the substrate is carried out. covered with gilding film by any appropriate method. By way of illustration, mention may be made of the use
  • one or more sets of pinch rollers as described in the figure 1 ;
  • of one or more pressure rollers as described in the figure 2 .

L'avantage fondamental de la présente invention est qu'on peut régler de manière indépendante les paramètres préférés de mise au point de la première mise en pression par rapport à ceux de la deuxième étape de mise en pression. La Demanderesse a découvert de manière inattendue que cela permettait d'optimiser à la fois les performances d'accroche de la feuille de dorure sur le substrat tout en améliorant la qualité visuelle du dépôt de dorure sur le substrat.The basic advantage of the present invention is that the preferred debugging parameters of the first pressurization can be set independently from those of the second pressurization step. The Applicant has discovered Unexpectedly, this made it possible to optimize both the adhesion performance of the gilding foil on the substrate while improving the visual quality of the deposition of gilding on the substrate.

La présente invention est décrite de manière illustrative et selon un de ses modes de réalisation dans la figure 3. On peut y voir sur la partie gauche de la figure, un groupe de pression conforme à la présente invention et qui se trouve en aval du groupe de dorure représenté sur la partie droite de la figure. Le substrat se déplace donc de droite à gauche.The present invention is described in an illustrative manner and according to one of its embodiments in the figure 3 . It can be seen on the left side of the figure, a pressure group according to the present invention and which is downstream of the gilding group shown on the right side of the figure. The substrate moves from right to left.

Le groupe de pression est constitué d'au minimum deux rouleaux motorisés, installés en vis-à-vis, tournant en sens contraire, et dont la distance est réglable de façon à s'adapter à différentes épaisseurs de substrats ; selon un mode d'exécution préféré de la présente invention, ce réglage tiendra compte non seulement de l'épaisseur du substrat mais également de l'épaisseur de l'encre et/ou du vernis préalablement imprimé sur le substrat ainsi que de manière optionnelle de toutes les épaisseurs rajoutées au substrat lors d'étapes de traitement du substrat précédant la dorure et également de manière optionnelle en tenant compte des épaisseurs des pellicules de la feuille de dorure déposées par le(s) groupe(s) de dorure.The pressure group consists of at least two motorized rollers, installed facing each other, rotating in the opposite direction, and whose distance is adjustable so as to adapt to different thicknesses of substrates; according to a preferred embodiment of the present invention, this adjustment will take into account not only the thickness of the substrate but also the thickness of the ink and / or varnish previously printed on the substrate as well as optionally all the thicknesses added to the substrate during steps of treatment of the substrate preceding the gilding and also optionally taking into account the thicknesses of the films of the gilding sheet deposited by the group (s) of gilding.

Selon un mode d'exécution particulier de la présente invention, l'écartement entre les rouleaux en vis-à-vis peut être motorisé et commandé de façon dynamique.According to a particular embodiment of the present invention, the spacing between the rollers vis-à-vis can be motorized and dynamically controlled.

Selon un mode d'exécution particulier et préféré de la présente invention, la surface du rouleau supérieur est différente de celle du rouleau inférieur ; en particulier, la surface du rouleau supérieur est plus compressible que celle du rouleau inférieur. A titre illustratif, le rouleau supérieur présente en surface une matière compressible lui permettant d'épouser la forme du dépôt de dorure alors que le rouleau inférieur sera constitué d'une matière plus dure, par exemple incompressible.According to a particular and preferred embodiment of the present invention, the surface of the upper roll is different from that of the lower roll; in particular, the surface of the upper roll is more compressible than that of the lower roll. As an illustration, the upper roller has on the surface a compressible material allowing it to match the shape of the deposit of gilding while the lower roller will be made of a harder material, for example incompressible.

Selon un mode d'exécution particulier de la présente invention, le rouleau supérieur comporte un dispositif de chauffage qui améliore la tenue de la dorure ; à titre d'exemple, ce dispositif de chauffage peut être avantageusement utilisé lorsque la pellicule de dorure est recouverte de vernis car le chauffage permet le ramollissement du dit vernis.According to a particular embodiment of the present invention, the upper roller comprises a heating device which improves the resistance of the gilding; for example, this heating device can be advantageously used when the gilding film is coated with varnish because the heating allows the softening of said varnish.

Selon un mode d'exécution particulier de la présente invention, le groupe de pression fonctionne avec une vitesse linéaire (en surface des rouleaux) supérieure ou égale à celle du groupe de dorure de façon à ne pas ralentir la machine.According to a particular embodiment of the present invention, the pressure unit operates with a linear speed (roller surface) greater than or equal to that of the gilding group so as not to slow down the machine.

Selon un mode d'exécution particulier de la présente invention, la distance entre le groupe de dorure et le groupe de pression est supérieure à la longueur maximale des substrats traités.According to a particular embodiment of the present invention, the distance between the gilding group and the pressure group is greater than the maximum length of the treated substrates.

Une caractéristique de la présente invention est qu'elle permet d'effectuer une étape de traitement de la pellicule de dorure par le groupe de pression qui contrôle cette étape de manière indépendante de l'étape de dépôt qui est contrôlée par le groupe de dorure ; ceci permet donc d'optimiser à la fois les performances d'accroche de la feuille de dorure sur le substrat tout en améliorant la qualité visuelle du dépôt de dorure sur le substrat.A feature of the present invention is that it makes it possible to carry out a step of treating the gilding film by the pressure group which controls this step of independently of the deposition step which is controlled by the gilding group; this thus makes it possible to optimize both the adhesion performance of the gilding foil on the substrate while improving the visual quality of the deposition of gilding on the substrate.

Les caractéristiques de contrôle du groupe de pression sont données ci-après à titre illustratif : pression réglable (par exemple de 1 à 10 bars, de préférence avec une pression de fonctionnement supérieure à 1 bar), et/ou vitesse réglable ; et/ou température réglable (par exemple une température de fonctionnement de maximum 250°C, par exemple comprise entre 50 et 240°C, de préférence comprise entre 140 et 220°C, par exemple de 180°C) ; et/ou dureté du revêtement du rouleau supérieur comprise entre 50 et 95 Shore A.The control characteristics of the pressure group are given below by way of illustration: adjustable pressure (for example from 1 to 10 bars, preferably with an operating pressure greater than 1 bar), and / or adjustable speed; and / or adjustable temperature (for example an operating temperature of at most 250 ° C, for example between 50 and 240 ° C, preferably between 140 and 220 ° C, for example 180 ° C); and / or hardness of the coating of the upper roller between 50 and 95 Shore A.

L'amélioration apportée par la présente invention a été démontrée en laboratoire par la Demanderesse grâce aux tests effectués en matière de qualité de tenue de la dorure ainsi qu'en effectuant des comparaisons visuelles directes entre divers échantillons. La qualité de tenue de la dorure a été effectuée au moyen du test « au scotch » : la dorure déposée est préalablement scarifiée à l'aide d'un cutter, un morceau de scotch est pressé sur la dorure puis vivement arraché ; si l'adhésif n'emporte pas la dorure, son adhésion est considérée comme satisfaisante.The improvement provided by the present invention has been demonstrated in the laboratory by the Applicant through the tests carried out in terms of quality of holding gilding as well as making direct visual comparisons between various samples. The quality of holding of the gilding was carried out by means of the "scotch" test: the gilding deposited is previously scarified with the aid of a cutter, a piece of Scotch is pressed on the gilding then strongly ripped; if the adhesive does not remove the gilding, its adhesion is considered satisfactory.

Le substrat peut être sélectionné parmi un grand nombre de matière et ne pas être considéré comme limité aux matières fréquemment utilisés dans les dispositifs standards d'impression et/ou de personnalisation tels que les substrats papier, carton et plastique. On citera à titre d'exemples non limitatifs le métal, le papier, le tissu non-tissé, le plastique, par exemple une résine copolymère méthacrylique, du polyester, du polycarbonate, du polyéthylène, du polypropylène, du polystyrène et/ou du chlorure de polyvinyle, ou même les matériaux de type cellulosique tels que, par exemple, le bois, le contreplaqué, ou les matériaux cristallins tels que le verre ou les céramiques, par exemple. L'invention s'applique donc également à toute combinaison de ces matériaux, comme par exemple les matériaux complexes comprenant un ou plusieurs de ces composants comme par exemple les briques de lait.The substrate can be selected from a large number of materials and not be considered as limited to materials frequently used in standard printing and / or personalization devices such as paper, cardboard and plastic substrates. Non-limiting examples are metal, paper, nonwoven fabric, plastic, for example a methacrylic copolymer resin, polyester, polycarbonate, polyethylene, polypropylene, polystyrene and / or chloride. polyvinyl, or even cellulosic materials such as, for example, wood, plywood, or crystalline materials such as glass or ceramics, for example. The invention therefore also applies to any combination of these materials, such as complex materials comprising one or more of these components such as milk bricks.

Selon la présente invention, le substrat (feuille, carte, etc...) se présente généralement sous une forme rectangulaire ou carrée. Cette feuille se déplace, en général grâce à un système de transport de substrats dans une machine d'impression, le long d'un chemin de transport orienté selon un axe longitudinal depuis au moins un magasin d'entrée fournissant les substrats imprimables et/ou personnalisables, jusqu'à au moins un magasin de sortie recevant les substrats imprimés et/ou personnalisés. Les « bords latéraux » du substrat sont donc les deux bords situés de part et d'autre de cet axe longitudinal; les bords avant et/ou arrière sont ses bords transversaux.According to the present invention, the substrate (sheet, card, etc.) is generally in a rectangular or square shape. This sheet moves, generally through a substrate transport system in a printing machine, along a transport path oriented along a longitudinal axis from at least one input magazine providing the printable substrates and / or customizable, up to at least one output store receiving the printed and / or customized substrates. The "lateral edges" of the substrate are therefore the two edges located on either side of this longitudinal axis; the front and / or back edges are its transverse edges.

La présente invention concerne un procédé et/ou un système de dorure. La présente invention concerne également un procédé et/ou un système d'impression comprenant une dorure du substrat. Toute technique de dorure adaptée au procédé de la présente invention peut être utilisée. Toutefois, selon certains modes de réalisation préférés de la présente invention, on utilise la technique de dorure à froid aussi connue sous le nom de « cold foil transfer ».The present invention relates to a method and / or a gilding system. The present invention also relates to a method and / or a printing system comprising a gilding of the substrate. Any gilding technique adapted to the process of the present invention can be used. However, according to some preferred embodiments of the present invention, the cold foil technique also known as "cold foil transfer" is used.

Ainsi, selon certains modes de réalisation de la présente invention, une feuille de dorure (qui fait donc partie du dispositif de dorure) est pressée contre les zones du substrat imprimées nécessitant le dépôt de la dite dorure. Ce contact entre la feuille de dorure et le substrat est généralement effectué au moyen de deux rouleaux entre lesquels le substrat et la feuille de dorure sont mis en contact.Thus, according to some embodiments of the present invention, a gilding sheet (which is therefore part of the gilding device) is pressed against the areas of the printed substrate requiring the deposition of said gilding. This contact between the gilding foil and the substrate is generally carried out by means of two rollers between which the substrate and the gilding foil are brought into contact.

Afin d'assurer un détachement optimal de la pellicule de dorure et son adhésion aux zones du substrat imprimées, on utilisera de préférence une colle. Cette colle pourra être soit positionnée sur les zones imprimées (avant d'appliquer la dorure), soit faire partie intégrante de la feuille de dorure elle-même. Dans certains modes de réalisation adaptés à la présente invention, on utilise une feuille de dorure qui intègre une pellicule de colle (qui sera pressée contre les zones à dorer) et on applique au préalable une colle (la même ou différente) sur les zones imprimées (avant d'appliquer la dorure). Dans d'autres modes de réalisation de la présente invention, une encre et/ou un vernis utilisé(s) pour l'impression permettent de conférer déjà aux zones destinées à être recouvertes de dorure une propriété adhésive ; cette dernière option est particulièrement avantageuse car elle permet d'éviter de rajouter de la colle sur les zones à dorer et/ou d'utiliser des feuilles de dorure exempt de pellicule adhésive.In order to ensure optimum detachment of the gilding film and its adhesion to the printed areas of the substrate, an adhesive is preferably used. This glue can be either positioned on the printed areas (before applying the gilding), or be an integral part of the gilding sheet itself. In some embodiments adapted to the present invention, a gilding sheet is used which incorporates a film of glue (which will be pressed against the zones to be gilded) and is applied in advance a glue (the same or different) on the printed areas (before applying gilding). In other embodiments of the present invention, an ink and / or a varnish used for printing can already give areas to be coated with gilding an adhesive property; the latter option is particularly advantageous because it avoids adding glue on the areas to be browned and / or using gilding sheets without adhesive film.

Enfin, selon certains modes de réalisation de la présente invention, la technique de dorure peut également comprendre une étape d'activation (par exemple au moyen de rayons UV) permettant de réticuler l'encre et/ou le vernis et/ou la colle et ainsi améliorer l'adhésion entre la feuille de dorure et les zones en relief du substrat.Finally, according to some embodiments of the present invention, the gilding technique may also comprise an activation step (for example by means of UV rays) making it possible to crosslink the ink and / or the varnish and / or the glue and thus improving the adhesion between the gilding foil and the raised areas of the substrate.

Il est évident pour l'homme du métier que les mots « dorure » et « dorer » utilisés dans la présente invention ne sont pas limités à l'utilisation de feuille d'or et que n'importe quel dispositif de « dorure » peut être employé. Ces termes couvrent bien entendu tous les types de feuilles décoratives (parfois également appelées feuilles métalliques) parmi lesquels on peut citer à titre d'exemples illustratifs et non limitatifs, l'aluminium, le chrome, l'or, l'argent, le cuivre ou même des sels de métaux optiquement actifs. En général, on utilise une feuille de dorure pressée contre le substrat à personnaliser, et la présente demande désigne donc par ce terme l'utilisation générale d'un dispositif de dorure.It is obvious to those skilled in the art that the words "gilding" and "gilding" used in the present invention are not limited to the use of gold leaf and that any "gilding" device may be employee. These terms of course cover all types of decorative sheets (sometimes also called foils) among which may be mentioned as illustrative and non-limiting examples, aluminum, chromium, gold, silver, copper or even optically active metal salts. In general, a gilding foil pressed against the substrate to be customized is used, and the present application thus designates by this term the general use of a gilding device.

Les feuilles de dorure utilisées dans le cadre de la présente invention sont généralement fournies sous la forme de rouleau de largeur sensiblement équivalente à la dimension transversale du substrat.The gilding sheets used in the context of the present invention are generally provided in the form of a roll of width substantially equivalent to the transverse dimension of the substrate.

Les feuilles de dorure utilisées dans le cadre de la présente invention sont généralement constituées de plusieurs pellicules superposées. On citera à titre d'exemple non limitatif, non exhaustif dans l'ordre d'accroche au substrat à dorer :

  • une pellicule d'adhésif (optionnelle mais préférée). Cette pellicule peut comprendre tout type de résine et/ou de cire et/ou de charge et peut aussi transiter vers un état collant sous l'effet de traitement thermique. Elle peut avoir une épaisseur qui est généralement comprise entre 0.5 et 5 microns ; et/ou
  • au moins une pellicule de dorure, et
  • une pellicule de protection (optionnelle mais préférée) aussi appelée de laquage et/ou de couleur (qui peut aussi comprendre tout type de colorant et/ou pigment et/ou agent de matage ou brillant). Cette pellicule de protection peut être caractérisée par de nombreuses propriétés en fonction de l'utilisation recherchée, que ce soit des propriétés de résistance chimique et/ou physique ; et/ou
  • une pellicule de décollement (optionnelle mais préférée) aussi appelée de libération (« release layer »). Cette pellicule est généralement très fine (d'une épaisseur habituellement inferieure a 0.1 micron) et elle peut être constituée à titre d'exemple à partir de résines et/ou de cires solubles dans des solvants ; et/ou
  • une couche dite de transport qui permet le transport de la feuille de dorure. Cette couche a une épaisseur qui est généralement comprise entre 5 et 50 microns. Elle est généralement constituée de films de polyester.
The gilding sheets used in the context of the present invention generally consist of several superimposed films. By way of nonlimiting example, not exhaustive in the order of attachment to the substrate to be gilded:
  • an adhesive film (optional but preferred). This film may comprise any type of resin and / or wax and / or filler and may also pass to a sticky state under the effect of heat treatment. It may have a thickness which is generally between 0.5 and 5 microns; and or
  • at least one film of gilding, and
  • a protective film (optional but preferred) also called lacquering and / or color (which may also include any type of dye and / or pigment and / or matting agent or gloss). This protective film may be characterized by numerous properties depending on the desired use, whether of chemical and / or physical resistance properties; and or
  • a release film (optional but preferred) also called release layer. This film is generally very thin (typically less than 0.1 microns thick) and may be exemplified from resins and / or waxes soluble in solvents; and or
  • a so-called transport layer that allows the transport of the gilding sheet. This layer has a thickness which is generally between 5 and 50 microns. It is usually made of polyester films.

Le procédé d'impression selon la présente invention concerne généralement une impression de substrat par jet d'encre qui met en relief des zones destinées à être recouvertes d'une feuille de dorure. L'impression par jet d'encre est bien connue de l'homme de l'art.The printing method according to the present invention generally relates to an ink jet substrate printing which highlights areas to be coated with a gilding sheet. Ink jet printing is well known to those skilled in the art.

Les zones peuvent être toutes sortes de formes, par exemple des points, des lettres et/ou toutes autres formes géométriques quelconques. Elles peuvent être constituées de différentes matières, par exemple d'encres et/ou de vernis. Elles peuvent également être recouvertes d'une couche de matière, par exemple recouvertes de colle, avant l'étape de dorure ; toutefois, selon certains modes de réalisation de la présente invention, l'étape de dorure s'effectue directement sur l'encre et/ou le vernis déposé par jet d'encre.The zones can be all kinds of shapes, for example points, letters and / or any other geometric shapes. They may be made of different materials, for example inks and / or varnish. They may also be covered with a layer of material, for example covered with glue, before the gilding step; however, according to some embodiments of the present invention, the gilding step is carried out directly on the ink and / or the inkjet coated varnish.

Le relief des dites zones destinées à être recouvertes d'une feuille de dorure représente de préférence une épaisseur de l'ordre du micron, de préférence supérieure à cinq microns, ou même supérieure à dix microns. Cette épaisseur - de quelque matière que ce soit préalablement déposée sur le substrat ; par exemple du vernis et/ou de l'encre - est généralement inférieure au millimètre pour l'impression en relief. Toutefois, la présente invention pourrait également s'appliquer à des substrats ayant été imprimés par la technologie 3D au moyen d'impression à jet d'encre (et/ou vernis) par couches successives et présentant ainsi des épaisseurs pouvant aller jusqu'à plusieurs centimètres, par exemple moins de 2 cm.The relief of said zones intended to be covered with a gilding foil preferably represents a thickness of the order of one micron, preferably greater than five microns, or even greater than ten microns. This thickness - of any material previously deposited on the substrate; for example, varnish and / or ink - is generally less than one millimeter for relief printing. However, the present invention could also be applied to substrates that have been printed by 3D technology by means of inkjet printing (and / or varnish) in successive layers and thus having thicknesses of up to several centimeters, for example less than 2 cm.

On comprend de ce qui précède que la présente invention concerne également au moins un dispositif (ou un système) d'impression et/ou de personnalisation comprenant des moyens de mise en oeuvre d'au moins un des procédés décrits dans la présente demande. Grâce aux considérations fonctionnelles fournies dans la présente demande, on comprend que de tels systèmes ou dispositifs comportent des moyens d'accomplir les fonctions décrites en référence au procédé et qu'il n'est pas nécessaire de détailler ces moyens.It is understood from the foregoing that the present invention also relates to at least one device (or system) for printing and / or personalization comprising means for implementing at least one of the methods described in the present application. Thanks to the functional considerations provided in the present application, it is understood that such systems or devices comprise means for performing the functions described with reference to the method and that it is not necessary to detail these means.

La présente demande décrit diverses caractéristiques techniques et avantages en référence aux figures et/ou à divers modes de réalisation. L'homme de métier comprendra que les caractéristiques techniques d'un mode de réalisation donné peuvent en fait être combinées avec des caractéristiques d'un autre mode de réalisation à moins que l'inverse ne soit explicitement mentionné ou qu'il ne soit évident que ces caractéristiques sont incompatibles ou que la combinaison ne fournisse pas une solution à au moins un des problèmes techniques mentionnés dans la présente demande. De plus, les caractéristiques techniques décrites dans un mode de réalisation donné peuvent être isolées des autres caractéristiques de ce mode à moins que l'inverse ne soit explicitement mentionné.The present application describes various technical features and advantages with reference to the figures and / or various embodiments. Those skilled in the art will appreciate that the technical features of a given embodiment may in fact be combined with features of another embodiment unless the reverse is explicitly mentioned or it is evident that these characteristics are incompatible or that the combination does not provide a solution to at least one of the technical problems mentioned in this application. In addition, the technical features described in a given embodiment can be isolated from the other features of this mode unless the opposite is explicitly mentioned.

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, et l'invention ne doit pas être limitée aux détails donnés ci-dessus.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 within the scope defined by the scope of the appended claims, and the invention should not be limited to the details given above.

Claims (12)

  1. Method for gilding a substrate by applying pressure between the areas of the substrate to be gilded and a gilding foil comprising a gilding film and a transport layer characterized in that the step to apply the pressure and place the gilding film and the step to separate the gilding film from the foil transport layer is followed by an additional and consecutive step of applying pressure to the areas of the gilding film-coated substrate.
  2. Method for gilding in accordance with the foregoing Claim characterized in that the gilding foil consists of several superposed films comprising
    a an optional adhesive film,
    b at least one gilding film,
    c. one optional protective film,
    d. a release film, and
    e. at least one transfer layer that that allows transporting the gilding sheet.
  3. Method for gilding in accordance with any of the foregoing Claims characterized in that the pressure of the pressure step application to the areas of the substrate covered by the gilding film is adjustable and preferably falls between 1 and 10 bars, for example an upper pressure at 1 bar and a lower pressure at 10 bars.
  4. Method for gilding in accordance with any of the foregoing Claims characterized in that in the pressure application step of the areas of the substrate covered with gilding film also comprises an increase in the temperature of the gilding film.
  5. Method for gilding in accordance with the foregoing Claim characterized in that the temperature is adjustable and is preferable comprised between 50 and 240°C, for example, comprising between 140 and 220°C.
  6. Process for printing a substrate and customization of said substrate by gilding comprising an ink jet printing step for the substrate that prints in relief on areas on the substrate, areas that are then coated with a gilding foil by a method according to any of the foregoing Claims.
  7. Method according to the foregoing Claim characterized in that the relief of said areas has a thickness greater than one micron, preferably greater than five microns.
  8. System for gilding a substrate comprising at least one group to apply pressure and place the gilding film suitable for applying pressure between the areas of the substrate to be gilded and a gilding foil comprising a gilding film and a transport layer characterized in that it comprises at least one pressure group located downstream from the group to apply pressure and place the gilding film and the means to separate the gilding foil from the foil transport layer, and adapted to apply pressure to the areas of the substrate covered with gilding film.
  9. System according to the foregoing Claim characterized in that the pressure group is made up of a minimum of two motorized rollers, installed opposite each other, rotating in opposite directions, and whose distance is adjustable so as to adapt to the different thicknesses of the substrate.
  10. System according to any of Claims 8 to 9, characterized in that the group to apply pressure comprises a heating device, said device preferably being integrated into the upper motorized roller.
  11. System according to any of Claims 9 to 10, characterized in that the hardness of the upper roller coating is between 50 and 95 Shore A.
  12. System for printing a substrate and customization of said substrate by gilding comprising an ink jet printing group adapted to print in relief by means of ink and/or varnish characterized in that it also comprises a gilding system for pre-printed substrates according to any one of Claims 8 to 11.
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IL247440A0 (en) 2016-11-30
US20170072711A1 (en) 2017-03-16
PL3122571T3 (en) 2019-07-31
EP3122571A1 (en) 2017-02-01
JP2020124921A (en) 2020-08-20
US9895903B2 (en) 2018-02-20
IL247440B (en) 2020-07-30
JP6687528B2 (en) 2020-04-22
JP2017515699A (en) 2017-06-15
WO2015144637A1 (en) 2015-10-01
JP7007418B2 (en) 2022-01-24

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