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WO2007039656A2 - System and method for printing on substrates with aqueous inks that can be cured by means of electron beam radiation - Google Patents

System and method for printing on substrates with aqueous inks that can be cured by means of electron beam radiation Download PDF

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Publication number
WO2007039656A2
WO2007039656A2 PCT/ES2006/000547 ES2006000547W WO2007039656A2 WO 2007039656 A2 WO2007039656 A2 WO 2007039656A2 ES 2006000547 W ES2006000547 W ES 2006000547W WO 2007039656 A2 WO2007039656 A2 WO 2007039656A2
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
inks
printing
station
coil
Prior art date
Application number
PCT/ES2006/000547
Other languages
Spanish (es)
French (fr)
Other versions
WO2007039656A3 (en
Inventor
Juan Davila Casitas
Original Assignee
Serviflex, Sl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Serviflex, Sl filed Critical Serviflex, Sl
Publication of WO2007039656A2 publication Critical patent/WO2007039656A2/en
Publication of WO2007039656A3 publication Critical patent/WO2007039656A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B41F23/0406—Drying webs by radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F3/00—Cylinder presses, i.e. presses essentially comprising at least one cylinder co-operating with at least one flat type-bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F16/00—Transfer printing apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • B41M1/18—Printing one ink over another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams

Definitions

  • the present invention concerns a system and method for printing substraters, in general laminar bands with thermal inks curable by thermal energy, in particular by electron beam radiation (EB beam electron).
  • Printing is preferably carried out with a flexographic machine, or with a series of successive printing stations, each of which has its own printing drum associated.
  • tack is defined in the printing industry as the force necessary to separate an ink film between two rollers, usually measured by a Thwing Albert ink meter.
  • inks for printing in low viscosity flexography which include a solvent that controls said viscosity and contributes to implementing the said wet trapping phenomenon.
  • these flexographic inks do not include (or include in minimum quantities) photoinitiators and have a water content of the order of 25 to 30%, which makes it possible to adequately evaporate between the successive stations of a multicolored flexographic machine, taking advantage of the phenomenon of "wet trapping" cited.
  • US-A-5407708 discloses a system and a method for printing substrates by means of radiation curable inks in a flexographic printing system, which combines a UV curing station prior to a final curing station by electronic beam radiation .
  • EB The application of this technology to the case of white would solve the inconvenience explained.
  • the invention provides a system and method for printing substrates with aqueous inks curable by electron beam radiation, which does not require one or more auxiliary curing stations of ultraviolet (UV), and which allows the white color to be printed.
  • UV ultraviolet
  • the invention also provides a system and method, whereby the cured inks are adhered to a first or a second substrate depending on the surface tension thereof, previously selected, whereby a copying (duplicate) of surface finishes such as different degrees of roughness from gloss to matt and micro relief.
  • dependent claims 2 to 14 details the implementation in a single central drum flexographic machine
  • dependent claim 12 details the implementation in the case of a distribution of stacked printing units, each unit having its own printing drum (structure "Stack").
  • Fig. 1 is a schematic diagram illustrating a system and method for printing substrates with aqueous inks curable by electron beam radiation in accordance with a first embodiment of the present invention, with details A, B, C, D, E and F expanded; Y
  • Fig. 2 is a schematic diagram illustrating a second embodiment of the present invention, with enlarged details A, B, C, D, E and F.
  • Fig. 1 shows the system for printing substrates with aqueous inks curable by electron beam radiation in accordance with a first embodiment of the system of the present invention, and from the description From it, the characteristics of a first example of the method implemented by it will become evident.
  • the system comprises a first coil 9 from which a first substrate 1 is unwound in the form of a continuous band that passes around a central printing drum 7.
  • a plurality of stations of print 3, 3a are arranged around said central print drum 7 to print successively and wet on wet several colors on said first substrate 1 using inks 8, aqueous, curable by electron beam radiation, while the first substrate 1 is dynamically supported on said central printing drum 7.
  • Each of these printing stations 3, 3a It generally comprises, and as is well known in the art, a printing roller 21 on which a cliché is mounted with the reasons to be printed arranged to rotate in contact with the first substrate 1 resting on the central printing drum 7, a ink roller 22 for smearing the printing roller 21 with ink and a scraper device 23 for applying ink to said ink roller 22.
  • each of the printing stations 3, 3a has associated an own printing drum, so that each printing station 3, 3a prints its corresponding color on the first substrate 1 while This is dynamically supported on said own printing drum, without this altering the essential characteristics of the present invention.
  • the first substrate 1 has a face to be printed having a first surface tension and comprising a surface finish 13 (see the enlarged detail A of Fig. 1).
  • This surface finish 13 may be selected, for example, between different degrees of roughness, from a very low degree of roughness to provide a glossy finish to a higher degree of roughness to provide a matte finish.
  • the surface finish 13 may include a micro relief to provide a hologram effect, or other effects.
  • a second substrate 2 is unwound which has a face having a second surface tension and a surface finish suitable as a support for the inks 8 (see the enlarged detail C of Ia Fig. 1).
  • This second substrate 2 is suitable to the requirements of the desired final product.
  • the first substrate 1 with the uncured inks 8 printed and this second substrate 2 meet at a roller pressure station 4 in which the second substrate 2 is attached and pressed on the uncured inks 8 printed on said first substrate 1.
  • the mentioned roller pressure station 4 comprises, for example, a pair of pressure rollers 14, 15 facing and pushed towards each other by means of pressure 16 capable of applying a controlled pressure.
  • Guiding means for example, rollers 19, are arranged to pass the first and second overlapping substrates 1, 2, and with the inks 8 between them, by the tightening of said pair of pressure rollers 14, 15. Obviously , if necessary, more than one pair of pressure rollers could be arranged consecutively to press the second substrate 2 against the uncured inks 8 printed on the first substrate 1.
  • a station is arranged curing 5.
  • rollers 20 constitute means for keeping the first and second substrates 1, 2 superimposed, with the inks 8 arranged between them, while passing in front of an electronic beam emitting apparatus 17 which is located in said station of curing 5.
  • said electronic beam emitter 17 radiates an electronic beam on the set of the first and second overlapping substrates 1, 2 and with the inks 8 between In order to effect the curing of the inks 8.
  • the first and second substrates 1, 2 are attached and the cured inks 8 are arranged between them (see the enlarged detail D of Fig. 1 ).
  • the system comprises a separation station 6 which serves to separate the second substrate 2 from the first substrate 1.
  • the second surface tension of the second substrate 2 is greater than the first surface tension of the first substrate 1, and this causes the cured inks 8 to adhere to the second substrate 2 while they come off the first substrate 1.
  • the inks 8 are transferred from the first substrate 1 to the second substrate 2, with the ink layers of different colors arranged in the reverse order of how they were initially printed on the first substrate 1.
  • the aforementioned surface finish 13 of the first substrate 1 is copied in negative to the cured inks 8 transferred to the second substrate 2 (see the enlarged detail E of Fig. 1).
  • the first substrate 1, free of inks is wound in a third coil 10 while, on the other hand, the second substrate 2 with the cured inks 8 adhered thereto ( detail E of Fig. 1) is wound in a fourth coil 12.
  • the substrate 1 rolled in the third coil 10 is substantially in the same initial state of the process, when it was unwound from the first coil 9 (detail A of Fig. 1). Therefore, an additional advantage of the system and of this example of embodiment of the method of the present invention is that the first coil 9 can be replaced by said third coil 10 in order to reuse the first substrate 1 for a new printing process and transfer of inks 8 from the first to the second substrate. Obviously, the number of times the first substrate can be reused is limited by its wear.
  • a white ink is applied first, which acts as an opaque white base on which the remaining colors are successively printed, which are more or less transparent, and each printed ink is dried before on it the printing of the following is carried out by means of drying units arranged between the different printing stations.
  • the aqueous inks 8 curable by electron beam radiation used in the system and method of the present invention have, for the different colors, a water content of 25% to 30%, and spontaneously dry enough to allow wet to wet printing process without the need to incorporate dryer units arranged between the different printing stations.
  • aqueous inks 8 curable by electron beam radiation the exception is white ink, which has a water content of only 5% to 10% and a solids content of 35% to 45%. For this reason, the aqueous ink curable by white electron beam radiation does not support printing wet on wet and not suitable for use opaque white base on which the remaining colors are printed successively.
  • the system and the method according to this first embodiment of the present invention provide a solution to this problem including a white printing station 3a in the last place of the printing stations 3, 3a around the central printing drum 7 to print a white ink in the last place, that is, above the inks of the other colors, before the first substrate 1 leaves the central printing drum 7 and enters the roller pressure station 4.
  • a white printing station 3a in the last place of the printing stations 3, 3a around the central printing drum 7 to print a white ink in the last place, that is, above the inks of the other colors, before the first substrate 1 leaves the central printing drum 7 and enters the roller pressure station 4.
  • Fig. 2 a second example of embodiment of the invention is illustrated, where the same numerical references as in Fig. 1 have been used to designate similar elements.
  • the system of Fig. 2 comprises, as in the first embodiment, printing stations 3, 3a arranged around a central printing drum 7, a roller pressure station 4, a curing station 5 and a separation station 6, which essentially respond to the description that has been made of them above in relation to Fig. 1.
  • a first substrate 1 in the form of a continuous band is unwound from a first coil 9 before entering the print stations 3, 3a.
  • This first substrate 1 comprises a face to be printed that has a first surface tension and a surface finish suitable as a support for the inks 8, and is suitable to the requirements of the desired final product (see the enlarged detail A of Fig. 2) . While the first substrate 1 passes around the central printing drum 7 the different printing stations 3, 3a successively print different colors on the same wet on wet using aqueous inks curable by electron beam radiation. To the leaving the printing stations 3, 3a, the inks 8 are adhered on the first substrate 1 (see the enlarged detail B of Fig. 2).
  • a second substrate 2 is unwound in the form of a continuous band comprising a face to be superimposed on the inks 8 printed on the first substrate 1.
  • This face has a second surface tension and a surface finish 18 which can comprise different degrees of roughness, from glossy to matte, or a micro relief capable of producing, for example, a hologram effect (see the enlarged detail C of Fig. 2).
  • the first substrate 1 with the inks 8 adhered thereto meets the second substrate 2 in the roller pressure station 4, both first and second substrates 1, 2 attached, and with the inks 8 arranged between them (see the enlarged detail D of Fig.
  • the first and second substrates 1, 2 are separated.
  • the first surface tension of the first substrate 1 is greater than the second surface tension of the second substrate 2.
  • the cured inks 8 remain adhered to the first substrate 1, and said surface finish 18 of the second substrate 2 is negatively copied to the cured inks 8 adhered to the first substrate 1 (see the enlarged detail F of Fig. 2), which is wound together with the inks 8 in a third coil 10 after leaving said separation station 6.
  • the second substrate 2 once separated, is free of inks (see the enlarged detail E of Fig. 2) and is wound in a fourth coil 12 after leaving the separation station 6.
  • the second substrate 2 when it is wound in the fourth coil 12 (detail E of Fig. 2) is substantially in it Initially, the second substrate 2 unwound from the second coil 11 (detail C of Fig. 2) at the beginning of the process. Therefore, the second coil 11 once empty can be replaced by the fourth coil 12 in order to reuse the second substrate 2, and so on as many times as the degree of wear of the second substrate 2 as advised.
  • FIG. 1 is to provide an opaque base layer by means of a white ink in a wet to wet printing process using aqueous inks curable by electron beam radiation.
  • FIG. 2 An application of the second embodiment (Fig. 2) is that of providing a final surface finish to aqueous inks curable by wet beam radiation printed wet on wet on a substrate.
  • the method of the first and second embodiments of the present invention has in common the following steps. First, successively print wet on wet, by means of a plurality of printing stations 3, 3a, various colors on a first substrate 1 with aqueous inks 8 curable by electron beam radiation, said first substrate 1 having a first surface tension.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Printing Methods (AREA)

Abstract

The invention relates to a system and method for printing on substrates with aqueous inks that can be cured by means of electron beam radiation. The inventive system comprises printing stations (3, 3a) for the wet-on-wet printing of different inks (8) on a first substrate (1) with a first surface tension, a roller pressing station (4) for positioning and pressing a second substrate (2) with a second surface tension against the printed face of the first substrate (1), a curing station (5) for irradiating an electron beam onto the first and second stacked substrates (1, 2) and the inks (8) therebetween in order to cure the inks (8), and a separation station (6) for separating the second substrate (2) from the first substrate (1). The cured inks (8) remain affixed to the first substrate (1) or the second substrate (2) depending on the relationship between the first and second surface tensions of said two substrates (1, 2).

Description

SISTEMA Y MÉTODO PARA IMPRESIÓN DE SUBSTRATOS CON TINTAS ACUOSAS CURABLES POR RADIACIÓN DE HAZ ELECTRÓNICO SYSTEM AND METHOD FOR PRINTING SUBSTRATES WITH CURABLE WATER INKS BY ELECTRONIC BEAM RADIATION
Sector de la técnica La presente invención concierne a un sistema y un método para impresión de substratros, en general bandas laminares con tintas acuosas curables por energía térmica, en particular por radiación de haz electrónico (electrón beam EB). La impresión se realiza preferentemente con una máquina flexográfica, o con una serie de estaciones de impresión sucesivas, cada una de las cuales tiene asociado un tambor de impresión propio.TECHNICAL FIELD The present invention concerns a system and method for printing substraters, in general laminar bands with thermal inks curable by thermal energy, in particular by electron beam radiation (EB beam electron). Printing is preferably carried out with a flexographic machine, or with a series of successive printing stations, each of which has its own printing drum associated.
Estado de Ia técnica anteriorState of the prior art
Los sistemas de tintas curables por radiación que son curados por una radiación de haz electrónico (EB) se conocen desde hace años en el mercado. Sin embargo Ia adaptación de tales sistemas a una máquina flexográfica requiere de una formulación de Ia tinta a emplear que permita una buena evaporación de Ia tinta entre las sucesivas estaciones, de manera que sea posible imprimir húmedo sobre húmedo (fenómeno conocido como "wet oñ wet" o "wet trapping"). El principio de "wet trapping" se ha propuesto en Ia impresión flexográfica basado en el reconocimiento de que cuando se depositan múltiples capas de tinta, Ia mezcla entre las mismas no se producirá si cada capa es depositada sobre una capa que tiene una viscosidad mayor que Ia nueva capa depositada.Radiation curable ink systems that are cured by electronic beam (EB) radiation have been known in the market for years. However, the adaptation of such systems to a flexographic machine requires a formulation of the ink to be used that allows a good evaporation of the ink between the successive stations, so that it is possible to print wet on wet (phenomenon known as "wet oñ wet "or" wet trapping "). The principle of "wet trapping" has been proposed in the flexographic printing based on the recognition that when multiple layers of ink are deposited, the mixing between them will not occur if each layer is deposited on a layer that has a viscosity greater than The new deposited layer.
Los colores sucesivos son retenidos ("wet trapped") controlando el "tack" o viscosidad de las tintas a través de Ia formulación de las mismas. El término "tack" se define en Ia industria de impresión como Ia fuerza necesaria para separar un film de tinta entre dos rodillos, usualmente medido por un Thwing Albert medidor de tinta.Successive colors are retained ("wet trapped") controlling the "tack" or viscosity of the inks through the formulation thereof. The term "tack" is defined in the printing industry as the force necessary to separate an ink film between two rollers, usually measured by a Thwing Albert ink meter.
En particular se conocen tintas para impresión en flexografía de baja viscosidad que incluyen un disolvente que controla dicha viscosidad y que contribuye a implementar el citado fenómeno de wet trapping.In particular, inks for printing in low viscosity flexography are known which include a solvent that controls said viscosity and contributes to implementing the said wet trapping phenomenon.
Las patentes US-A-5690028, US-A-5750186, US-A-5830927, US-A- 5830927, US-A-5866628, US-A-6284816, US-A-6 US-A-669769, US-A-6727295, US-A-6772683 y solicitud de patente US-A-2004/0176530 describen composiciones de tinta curables por energía en principio adecuadas para su aplicación en flexografía.US-A-5690028, US-A-5750186, US-A-5830927, US-A-5830927, US-A-5866628, US-A-6284816, US-A-6 US-A-669769, US -A-6727295, US-A-6772683 and patent application US-A-2004/0176530 describe energy curable ink compositions in principle suitable for application in flexography.
En general estas tintas flexográficas no incluyen (o incluyen en cantidades mínimas) fotoiniciadores y tienen un contenido en agua del orden de un 25 a un 30 % Io que hace factible una adecuada evaporación entre las sucesivas estaciones de una máquina flexográfica multicolor, aprovechando el fenómeno de "wet trapping" citado.In general, these flexographic inks do not include (or include in minimum quantities) photoinitiators and have a water content of the order of 25 to 30%, which makes it possible to adequately evaporate between the successive stations of a multicolored flexographic machine, taking advantage of the phenomenon of "wet trapping" cited.
Sin embargo ello no es válido para el color blanco, por cuanto Ia tinta necesaria para generar dicho color tiene un bajo contenido en agua únicamente del orden de un 5% a un 10%.However, this is not valid for the white color, since the ink necessary to generate said color has a low water content only of the order of 5% to 10%.
La patente US-A-5407708, describe un sistema y un método para Ia impresión de sustratos mediante tintas curables por radiación en un sistema de impresión flexográfica, que combina una estación UV de curado previa a una estación de curado final por radiación de haz electrónico. EB La aplicación de esta tecnología al caso del color blanco resolvería el inconveniente explicado.US-A-5407708, discloses a system and a method for printing substrates by means of radiation curable inks in a flexographic printing system, which combines a UV curing station prior to a final curing station by electronic beam radiation . EB The application of this technology to the case of white would solve the inconvenience explained.
Exposición de Ia invenciónExhibition of the invention
La invención aporta un sistema y un método para impresión de sustratos con tintas acuosas curables por radiación de haz electrónico, que no precisa de una o más estaciones de curado auxiliares de ultravioleta (UV), y que permite imprimir el color blanco.The invention provides a system and method for printing substrates with aqueous inks curable by electron beam radiation, which does not require one or more auxiliary curing stations of ultraviolet (UV), and which allows the white color to be printed.
La invención proporciona asimismo un sistema y un método, mediante el cual las tintas curadas quedan adheridas a un primer o un segundo sustrato en función de Ia tensión superficial de los mismos .previamente seleccionada, con Io que se consigue además un copiado (duplicado) de acabados superficiales tales como diferentes grados de rugosidad desde brillante a mate y microrrelieve.The invention also provides a system and method, whereby the cured inks are adhered to a first or a second substrate depending on the surface tension thereof, previously selected, whereby a copying (duplicate) of surface finishes such as different degrees of roughness from gloss to matt and micro relief.
Las características del sistema propuesto aparecen detalladas en forma de combinación de elementos en Ia reivindicación 1.The characteristics of the proposed system are detailed in the form of a combination of elements in claim 1.
Otras características del sistema de Ia invención aparecen detalladas en las reivindicaciones dependientes 2 a 14. En particular, Ia reivindicación dependiente 11 detalla Ia implementación en una máquina flexográfica de tambor central único, y Ia reivindicación dependiente 12 detalla Ia implementación en el caso de una distribución de unidades de impresión apiladas, disponiendo cada unidad de un tambor de impresión propio (estructura "Stack").Other features of the system of the invention are detailed in dependent claims 2 to 14. In particular, the dependent claim 11 details the implementation in a single central drum flexographic machine, and the dependent claim 12 details the implementation in the case of a distribution of stacked printing units, each unit having its own printing drum (structure "Stack").
En cuanto al método, las características de las etapas básicas del mismo aparecen en Ia reivindicación independiente 15 y otras particularidades se detallan en las reivindicaciones 16 a 28 dependientes de Ia misma.As for the method, the characteristics of the basic stages thereof appear in independent claim 15 and other particularities are detailed in claims 16 to 28 dependent on it.
Breve descripción de los dibujosBrief description of the drawings
Las anteriores y otras ventajas y características se comprenderán más plenamente a partir de Ia siguiente descripción detallada de un ejemplo de realización con referencia a los dibujos adjuntos, en los que:The foregoing and other advantages and features will be more fully understood from the following detailed description of an exemplary embodiment with reference to the attached drawings, in which:
Ia Fig. 1 es un diagrama esquemático que ¡lustra un sistema y método para impresión de substratos con tintas acuosas curables por radiación de haz electrónico de acuerdo con un primer ejemplo de realización de Ia presente invención, con unos detalle A, B, C, D, E y F ampliados; yFig. 1 is a schematic diagram illustrating a system and method for printing substrates with aqueous inks curable by electron beam radiation in accordance with a first embodiment of the present invention, with details A, B, C, D, E and F expanded; Y
Ia Fig. 2 es un diagrama esquemático que ilustra un segundo ejemplo de realización de Ia presente invención, con unos detalle A, B, C, D, E y F ampliados.Fig. 2 is a schematic diagram illustrating a second embodiment of the present invention, with enlarged details A, B, C, D, E and F.
Descripción detallada de unos ejemplos de realizaciónDetailed description of some embodiments
Haciendo en primer lugar referencia a Ia Fig. 1 , en ella se muestra el sistema para impresión de substratos con tintas acuosas curables por radiación de haz electrónico de acuerdo con un primer ejemplo de realización del sistema de Ia presente invención, y a partir de Ia descripción del mismo se harán evidentes las características de un primer ejemplo de realización del método implementado por el mismo.Referring firstly to Fig. 1, it shows the system for printing substrates with aqueous inks curable by electron beam radiation in accordance with a first embodiment of the system of the present invention, and from the description From it, the characteristics of a first example of the method implemented by it will become evident.
De acuerdo con este primer ejemplo de realización, el sistema comprende una primera bobina 9 a partir de Ia cual se desenrolla un primer substrato 1 en Ia forma de una banda continua que pasa alrededor de un tambor central de impresión 7. Una pluralidad de estaciones de impresión 3, 3a están dispuestas alrededor de dicho tambor central de impresión 7 para imprimir sucesivamente y húmedo sobre húmedo varios colores sobre dicho primer substrato 1 utilizando unas tintas 8, acuosas, curables por radiación de haz electrónico, mientras el primer substrato 1 es soportado dinámicamente sobre dicho tambor central de impresión 7. Cada una de estas estaciones de impresión 3, 3a comprende en general, y como es bien conocido en Ia técnica, un rodillo de impresión 21 sobre el que está montado un cliché con los motivos a imprimir dispuesto para girar en contacto con el primer substrato 1 apoyado sobre el tambor central de impresión 7, un rodillo entintador 22 para embadurnar de tinta el rodillo de impresión 21 , y un dispositivo de rasqueta 23 para aplicar tinta a dicho rodillo entintador 22. Alternativamente, según un ejemplo de realización no mostrado, cada una de las estaciones de impresión 3, 3a tiene asociada un tambor de impresión propio, de manera que cada estación de impresión 3, 3a imprime su correspondiente color en el primer substrato 1 mientras éste es soportado dinámicamente sobre dicho tambor de impresión propio, sin que esto altere las características esenciales de Ia presente invención.According to this first embodiment, the system comprises a first coil 9 from which a first substrate 1 is unwound in the form of a continuous band that passes around a central printing drum 7. A plurality of stations of print 3, 3a are arranged around said central print drum 7 to print successively and wet on wet several colors on said first substrate 1 using inks 8, aqueous, curable by electron beam radiation, while the first substrate 1 is dynamically supported on said central printing drum 7. Each of these printing stations 3, 3a It generally comprises, and as is well known in the art, a printing roller 21 on which a cliché is mounted with the reasons to be printed arranged to rotate in contact with the first substrate 1 resting on the central printing drum 7, a ink roller 22 for smearing the printing roller 21 with ink and a scraper device 23 for applying ink to said ink roller 22. Alternatively, according to an embodiment not shown, each of the printing stations 3, 3a has associated an own printing drum, so that each printing station 3, 3a prints its corresponding color on the first substrate 1 while This is dynamically supported on said own printing drum, without this altering the essential characteristics of the present invention.
El primer substrato 1 presenta una cara a ser impresa que tiene una primera tensión superficial y que comprende un acabado superficial 13 (véase el detalle ampliado A de Ia Fig. 1 ). Este acabado superficial 13 puede estar seleccionado, por ejemplo, entre diferentes grados de rugosidad, desde un grado de rugosidad muy bajo para proporcionar un acabado brillante a un grado de rugosidad más alto para proporcionar un acabado mate. Opcionalmente, el acabado superficial 13 puede incluir un microrrelieve para proporcionar un efecto de holograma, u otros efectos. Obsérvese que en virtud de las especiales características de las tintas acuosas curables por radiación de haz electrónico, las cuales permiten Ia impresión de los diferentes colores húmedo sobre húmedo, entre las estaciones de impresión 3, 3a no hay ningún dispositivo de secado o curado para secar cada tinta antes de una sucesiva impresión, por Io que después de haber pasado por todas las estaciones de impresión 3, 3a, el primer substrato 1 lleva adheridas las tintas 8 sin curar (véase el detalle ampliado B de Ia Fig. 1 ).The first substrate 1 has a face to be printed having a first surface tension and comprising a surface finish 13 (see the enlarged detail A of Fig. 1). This surface finish 13 may be selected, for example, between different degrees of roughness, from a very low degree of roughness to provide a glossy finish to a higher degree of roughness to provide a matte finish. Optionally, the surface finish 13 may include a micro relief to provide a hologram effect, or other effects. Note that by virtue of the special characteristics of aqueous inks curable by electron beam radiation, which allow the printing of the different colors wet on wet, between the printing stations 3, 3a there is no drying or curing device for drying each ink before a successive printing, so that after having passed through all the printing stations 3, 3a, the first substrate 1 has the uncured inks 8 attached (see the enlarged detail B of Fig. 1).
Desde una segunda bobina 11 se desenrolla un segundo substrato 2 que presenta una cara que tiene una segunda tensión superficial y un acabado superficial apto como soporte de las tintas 8 (véase el detalle ampliado C de Ia Fig. 1 ). Este segundo substrato 2 es adecuado a los requerimientos del producto final deseado. El primer substrato 1 con las tintas 8 sin curar impresas y este segundo sustrato 2 se reúnen en una estación de presión por rodillos 4 en Ia que el segundo sustrato 2 es adosado y presionado sobre las tintas 8 sin curar impresas en dicho primer substrato 1. La mencionada estación de presión por rodillos 4 comprende, por ejemplo, un par de rodillos de presión 14, 15 enfrentados y empujados el uno hacia el otro por unos medios de presión 16 capaces de aplicar una presión controlada. Unos medios de guiado, por ejemplo, unos rodillos 19, están dispuestos para hacer pasar los primer y segundo substratos 1 , 2 superpuestos, y con las tintas 8 entre ambos, por el apriete de dicho par de rodillos de presión 14, 15. Obviamente, si fuera necesario, podría disponerse consecutivamente más de un par de rodillos de presión para presionar el segundo substrato 2 contra las tintas 8 sin curar impresas sobre el primer substrato 1. A continuación de Ia estación de presión por rodillos 4 está dispuesta una estación de curado 5. Por ejemplo, unos rodillos 20 constituyen unos medios para mantener los primer y segundo substratos 1 , 2 superpuestos, con las tintas 8 dispuestas entre ambos, mientras pasan enfrente de un aparato emisor de haz electrónico 17 que se encuentra en dicha estación de curado 5. Con ello, dicho emisor de haz electrónico 17 irradia un haz electrónico sobre el conjunto de los primer y segundo substratos 1 , 2 superpuestos y con las tintas 8 entre ambos para efectuar el curado de las tintas 8. A Ia salida de Ia estación de curado 5, los primer y segundo substratos 1 , 2 está adosados y las tintas 8 curadas están dispuestas entre ambos (véase el detalle ampliado D de Ia Fig. 1 ). Finalmente, el sistema comprende una estación de separación 6 que sirve para separar el segundo substrato 2 del primer substrato 1. En este primer ejemplo de realización, Ia segunda tensión superficial del segundo substrato 2 es mayor que Ia primera tensión superficial del primer substrato 1 , y esto ocasiona que las tintas 8 curadas queden adheridas al segundo substrato 2 al tiempo que se desprenden del primer substrato 1. En consecuencia, las tintas 8 son transferidas desde el primer substrato 1 al segundo substrato 2, con las capas de tinta de diferentes colores dispuestas en el orden inverso a como han sido impresas inicialmente sobre el primer substrato 1. Además, el mencionado acabado superficial 13 del primer substrato 1 queda copiado en negativo a las tintas 8 curadas transferidas al segundo substrato 2 (véase el detalle ampliado E de Ia Fig. 1).From a second coil 11 a second substrate 2 is unwound which has a face having a second surface tension and a surface finish suitable as a support for the inks 8 (see the enlarged detail C of Ia Fig. 1). This second substrate 2 is suitable to the requirements of the desired final product. The first substrate 1 with the uncured inks 8 printed and this second substrate 2 meet at a roller pressure station 4 in which the second substrate 2 is attached and pressed on the uncured inks 8 printed on said first substrate 1. The mentioned roller pressure station 4 comprises, for example, a pair of pressure rollers 14, 15 facing and pushed towards each other by means of pressure 16 capable of applying a controlled pressure. Guiding means, for example, rollers 19, are arranged to pass the first and second overlapping substrates 1, 2, and with the inks 8 between them, by the tightening of said pair of pressure rollers 14, 15. Obviously , if necessary, more than one pair of pressure rollers could be arranged consecutively to press the second substrate 2 against the uncured inks 8 printed on the first substrate 1. Next to the roller pressure station 4 a station is arranged curing 5. For example, rollers 20 constitute means for keeping the first and second substrates 1, 2 superimposed, with the inks 8 arranged between them, while passing in front of an electronic beam emitting apparatus 17 which is located in said station of curing 5. Thus, said electronic beam emitter 17 radiates an electronic beam on the set of the first and second overlapping substrates 1, 2 and with the inks 8 between In order to effect the curing of the inks 8. At the exit of the curing station 5, the first and second substrates 1, 2 are attached and the cured inks 8 are arranged between them (see the enlarged detail D of Fig. 1 ). Finally, the system comprises a separation station 6 which serves to separate the second substrate 2 from the first substrate 1. In this first embodiment, the second surface tension of the second substrate 2 is greater than the first surface tension of the first substrate 1, and this causes the cured inks 8 to adhere to the second substrate 2 while they come off the first substrate 1. Consequently, the inks 8 are transferred from the first substrate 1 to the second substrate 2, with the ink layers of different colors arranged in the reverse order of how they were initially printed on the first substrate 1. In addition, the aforementioned surface finish 13 of the first substrate 1 is copied in negative to the cured inks 8 transferred to the second substrate 2 (see the enlarged detail E of Fig. 1).
Seguidamente, el primer substrato 1 , libre de tintas (véase el detalle ampliado F de Ia Fig. 1 ), es enrollado en una tercera bobina 10 mientras que, por otra parte, el segundo substrato 2 con las tintas 8 curadas adheridas al mismo (detalle E de Ia Fig. 1) es enrollado en una cuarta bobina 12. Se comprenderá que el substrato 1 enrollado en Ia tercera bobina 10 se encuentra substancialmente en el mismo estado inicial del proceso, cuando fue desenrollado de Ia primera bobina 9 (detalle A de Ia Fig. 1 ). Por consiguiente, una ventaja adicional del sistema y de este ejemplo de realización del método de Ia presente invención es que Ia primera bobina 9 puede ser reemplazada por dicha tercera bobina 10 con el fin de reutilizar el primer substrato 1 para un nuevo proceso de impresión y transferencia de las tintas 8 del primer al segundo substrato. Obviamente, el número de veces que el primer substrato puede ser reutilizado está limitado por el desgaste del mismo.Next, the first substrate 1, free of inks (see the enlarged detail F of Fig. 1), is wound in a third coil 10 while, on the other hand, the second substrate 2 with the cured inks 8 adhered thereto ( detail E of Fig. 1) is wound in a fourth coil 12. It will be understood that the substrate 1 rolled in the third coil 10 is substantially in the same initial state of the process, when it was unwound from the first coil 9 (detail A of Fig. 1). Therefore, an additional advantage of the system and of this example of embodiment of the method of the present invention is that the first coil 9 can be replaced by said third coil 10 in order to reuse the first substrate 1 for a new printing process and transfer of inks 8 from the first to the second substrate. Obviously, the number of times the first substrate can be reused is limited by its wear.
En procesos de impresión flexográfica convencionales, en especial cuando se usan substratos transparentes, usualmente se aplica una tinta blanca en primer lugar, Ia cual actúa como una base blanca opaca sobre Ia que se van imprimiendo sucesivamente los restantes colores, los cuales son más o menos transparentes, y cada tinta impresa es secada antes de que sobre Ia misma se efectúe Ia impresión de Ia siguiente mediante unas unidades secadoras dispuestas entre las diferentes estaciones de impresión. Las tintas 8 acuosas curables por radiación de haz electrónico utilizadas en el sistema y método de Ia presente invención tienen, para los diferentes colores, un contenido de agua de un 25% a un 30%, y se secan espontáneamente Io suficiente como para permitir un proceso de impresión húmedo sobre húmedo sin necesidad de incorporar unidades secadoras dispuestas entre las diferentes estaciones de impresión. En las tintas 8 acuosas curables por radiación de haz electrónico Ia excepción es Ia tinta de color blanco, Ia cual tiene un contenido en agua de sólo un 5% a un 10% y un contenido en sólidos de un 35% a un 45%. Por este motivo, Ia tinta acuosa curable por radiación de haz electrónico de color blanco no admite Ia impresión húmedo sobre húmedo y no es adecuada para ser utilizada base blanca opaca sobre Ia que se van imprimiendo sucesivamente los restantes colores.In conventional flexographic printing processes, especially when transparent substrates are used, usually a white ink is applied first, which acts as an opaque white base on which the remaining colors are successively printed, which are more or less transparent, and each printed ink is dried before on it the printing of the following is carried out by means of drying units arranged between the different printing stations. The aqueous inks 8 curable by electron beam radiation used in the system and method of the present invention have, for the different colors, a water content of 25% to 30%, and spontaneously dry enough to allow wet to wet printing process without the need to incorporate dryer units arranged between the different printing stations. In aqueous inks 8 curable by electron beam radiation, the exception is white ink, which has a water content of only 5% to 10% and a solids content of 35% to 45%. For this reason, the aqueous ink curable by white electron beam radiation does not support printing wet on wet and not suitable for use opaque white base on which the remaining colors are printed successively.
El sistema y el método de acuerdo con este primer ejemplo de realización de Ia presente invención aportan una solución a este problema incluyendo una estación de impresión de color blanco 3a en el último lugar de las estaciones de impresión 3, 3a alrededor del tambor central de impresión 7 para imprimir una tinta de color blanco en el último lugar, es decir, encima de las tintas de los demás colores, antes de que el primer substrato 1 abandone el tambor central de impresión 7 y entre en Ia estación de presión por rodillos 4. Así, cuando las tintas 8 son curadas y transferidas del primer substrato 1 al segundo substrato 2, Ia tinta de color blanco queda adyacente al segundo substrato 2, actuando como Ia base blanca opaca sobre Ia que están dispuestas las tintas de los restantes colores. Teniendo Ia previsión de disponer las restantes estaciones de impresión 3 de manera tal que los colores sean impresos en un orden inverso antes de Ia impresión del color blanco, las tintas de los colores quedarán en el orden correcto encima de Ia tinta de color blanco sobre el segundo substrato.The system and the method according to this first embodiment of the present invention provide a solution to this problem including a white printing station 3a in the last place of the printing stations 3, 3a around the central printing drum 7 to print a white ink in the last place, that is, above the inks of the other colors, before the first substrate 1 leaves the central printing drum 7 and enters the roller pressure station 4. Thus, when the inks 8 are cured and transferred from the first substrate 1 to the second substrate 2, the white ink is adjacent to the second substrate 2, acting as the opaque white base on which the inks of the remaining colors are arranged. Having the provision of arranging the remaining printing stations 3 in such a way that the colors are printed in a reverse order before the printing of the white color, the color inks will be in the correct order on top of the white ink on the Second substrate
Haciendo referencia ahora a Ia Fig. 2 se ilustra un segundo ejemplo de realización de Ia invención, donde se han utilizado las mismas referencia numéricas que en Ia Fig. 1 para designar elementos análogos. Así, el sistema de Ia Fig. 2 comprende, al igual que en el primer ejemplo de realización, unas estaciones de impresión 3, 3a dispuestas alrededor de un tambor central de impresión 7, una estación de presión por rodillos 4, una estación de curado 5 y una estación de separación 6, que responden esencialmente a Ia descripción que de las mismas se ha hecho más arriba en relación con Ia Fig. 1. Un primer substrato 1 en Ia forma de una banda continua es desenrollado de una primera bobina 9 antes de entrar en las estaciones de impresión 3, 3a. Este primer substrato 1 comprende una cara a ser impresa que tiene una primera tensión superficial y un acabado superficial apto como soporte de las tintas 8, y es adecuado a los requerimientos del producto final deseado (véase el detalle ampliado A de Ia Fig. 2). Mientras el primer substrato 1 pasa alrededor del tambor central de impresión 7 las diferentes estaciones de impresión 3, 3a imprimen sucesivamente sobre el mismo húmedo sobre húmedo diferentes colores utilizando tintas acuosas curables por radiación de haz electrónico. Al salir de las estaciones de impresión 3, 3a, las tintas 8 están adheridas sobre el primer substrato 1 (véase el detalle ampliado B de Ia Fig. 2).Referring now to Fig. 2, a second example of embodiment of the invention is illustrated, where the same numerical references as in Fig. 1 have been used to designate similar elements. Thus, the system of Fig. 2 comprises, as in the first embodiment, printing stations 3, 3a arranged around a central printing drum 7, a roller pressure station 4, a curing station 5 and a separation station 6, which essentially respond to the description that has been made of them above in relation to Fig. 1. A first substrate 1 in the form of a continuous band is unwound from a first coil 9 before entering the print stations 3, 3a. This first substrate 1 comprises a face to be printed that has a first surface tension and a surface finish suitable as a support for the inks 8, and is suitable to the requirements of the desired final product (see the enlarged detail A of Fig. 2) . While the first substrate 1 passes around the central printing drum 7 the different printing stations 3, 3a successively print different colors on the same wet on wet using aqueous inks curable by electron beam radiation. To the leaving the printing stations 3, 3a, the inks 8 are adhered on the first substrate 1 (see the enlarged detail B of Fig. 2).
Desde una segunda bobina 11 se desenrolla un segundo substrato 2 en Ia forma de una banda continua que comprende una cara a ser superpuesta a las tintas 8 impresas sobre el primer substrato 1. Esta cara tiene una segunda tensión superficial y un acabado superficial 18 que puede comprender diferentes grados de rugosidad, desde brillante a mate, o un microrrelieve capaz de producir, por ejemplo, un efecto de holograma (véase el detalle ampliado C de Ia Fig. 2). Al igual que en el primer ejemplo de realización, el primer substrato 1 con las tintas 8 adheridas al mismo se reúne con el segundo substrato 2 en Ia estación de presión por rodillos 4, ambos substratos primero y segundo 1 , 2 adosados, y con las tintas 8 dispuestas entre ambos (véase el detalle ampliado D de Ia Fig. 2), pasan a continuación frente a un aparato emisor de haz electrónico 17 en dicha estación de curado 5, donde las tintas 8 son curadas. Finalmente, en Ia estación de separación 6, los primer y segundo substratos 1 , 2 son separados. Sin embargo aquí, a diferencia del primer ejemplo de realización descrito más arriba en relación con Ia Fig. 1 , Ia primera tensión superficial del primer substrato 1 es mayor que Ia segunda tensión superficial del segundo substrato 2. Por este motivo las tintas 8 curadas permanecen adheridas al primer substrato 1 , y el mencionado acabado superficial 18 del segundo substrato 2 queda copiado en negativo a las tintas 8 curadas adheridas al primer substrato 1 (véase el detalle ampliado F de Ia Fig. 2), el cual es enrollado junto con las tintas 8 en una tercera bobina 10 después de salir de dicha estación de separación 6. Por su parte, el segundo substrato 2, una vez separado, queda libre de tintas (véase el detalle ampliado E de Ia Fig. 2) y es enrollado en una cuarta bobina 12 después de salir de Ia estación de separación 6. Se comprenderá que el segundo substrato 2 cuando es enrollado en Ia cuarta bobina 12 (detalle E de Ia Fig. 2) está substancialmente en el mismo estado inicial que el segundo substrato 2 desenrollado de Ia segunda bobina 11 (detalle C de Ia Fig. 2) al inicio del proceso. Por consiguiente, Ia segunda bobina 11 una vez vacía puede ser reemplazada por Ia cuarta bobina 12 con el fin de reutilizar el segundo substrato 2, y así sucesivamente tantas veces como el grado de desgaste del segundo substrato 2 Io aconsejen.From a second coil 11 a second substrate 2 is unwound in the form of a continuous band comprising a face to be superimposed on the inks 8 printed on the first substrate 1. This face has a second surface tension and a surface finish 18 which can comprise different degrees of roughness, from glossy to matte, or a micro relief capable of producing, for example, a hologram effect (see the enlarged detail C of Fig. 2). As in the first embodiment, the first substrate 1 with the inks 8 adhered thereto meets the second substrate 2 in the roller pressure station 4, both first and second substrates 1, 2 attached, and with the inks 8 arranged between them (see the enlarged detail D of Fig. 2), then pass in front of an electronic beam emitting apparatus 17 in said curing station 5, where the inks 8 are cured. Finally, in the separation station 6, the first and second substrates 1, 2 are separated. However, here, unlike the first embodiment described above in relation to Fig. 1, the first surface tension of the first substrate 1 is greater than the second surface tension of the second substrate 2. For this reason the cured inks 8 remain adhered to the first substrate 1, and said surface finish 18 of the second substrate 2 is negatively copied to the cured inks 8 adhered to the first substrate 1 (see the enlarged detail F of Fig. 2), which is wound together with the inks 8 in a third coil 10 after leaving said separation station 6. On the other hand, the second substrate 2, once separated, is free of inks (see the enlarged detail E of Fig. 2) and is wound in a fourth coil 12 after leaving the separation station 6. It will be understood that the second substrate 2 when it is wound in the fourth coil 12 (detail E of Fig. 2) is substantially in it Initially, the second substrate 2 unwound from the second coil 11 (detail C of Fig. 2) at the beginning of the process. Therefore, the second coil 11 once empty can be replaced by the fourth coil 12 in order to reuse the second substrate 2, and so on as many times as the degree of wear of the second substrate 2 as advised.
En resumen, los primer y segundo ejemplos de realización de Ia presente invención descritos más arriba en relación con las Figs. 1 y 2, respectivamente, difieren en que las tintas 8 una vez curadas quedan adheridas al primer substrato 1 o son transferidas al segundo substrato 2 en función de una relación entre las primera y segunda tensiones superficiales de los primer y segundo substratos 1 , 2. Si Ia segunda tensión superficial del segundo substrato 2 es mayor que Ia primera tensión superficial del primer substrato 1 , las tintas son transferidas del primer substrato 1 al segundo substrato 2 (Fig. 1). Por el contrario, si Ia primera tensión superficial del primer substrato 1 es mayor que Ia segunda tensión superficial del segundo substrato 2, las tintas son permanecen adheridas en el primer substrato 1 (Fig. 2). Una aplicación del primer ejemplo de realización (Fig. 1) es Ia de proporcionar una capa base opaca mediante una tinta blanca en un proceso de impresión húmedo sobre húmedo usando tintas acuosas curables por radiación de haz electrónico. Una aplicación del segundo ejemplo de realización (Fig. 2) es Ia de proporcionar un acabado superficial final a unas tintas acuosas curables por radiación de haz electrónico impresas húmedo sobre húmedo sobre un substrato. El método de los primer y segundo ejemplos de realización de Ia presente invención tiene en común los pasos siguientes. En primer lugar imprimir sucesivamente húmedo sobre húmedo, mediante una pluralidad de estaciones de impresión 3, 3a, varios colores sobre un primer substrato 1 con tintas 8 acuosas curables por radiación de haz electrónico, teniendo dicho primer substrato 1 una primera tensión superficial. A continuación adosar y presionar un segundo substrato 2 sobre Ia cara impresa de dicho primer substrato 1 en una estación de presión por rodillos 4, teniendo dicho segundo substrato 2 una segunda tensión superficial. Seguidamente irradiar, en una estación de curado 5, un haz electrónico sobre el conjunto de los primer y segundo substratos 1 , 2 superpuestos y con las tintas 8 entre ambos para el curado de las tintas 8. Finalmente, separar el segundo substrato 2 del primer substrato 1 en una estación de separación 6, quedando las tintas 8 curadas adheridas al primer substrato 1 o transferidas al segundo substrato 2 en función de una relación entre dichas primera y segunda tensiones superficiales de los primer y segundo substratos 1 , 2.In summary, the first and second embodiments of the present invention described above in relation to Figs. 1 and 2, respectively, differ in that the inks 8 once cured are adhered to the first substrate 1 or are transferred to the second substrate 2 depending on a relationship between the first and second surface tensions of the first and second substrates 1, 2. If the second surface tension of the second substrate 2 is greater than the first surface tension of the first substrate 1, the inks are transferred from the first substrate 1 to the second substrate 2 (Fig. 1). On the contrary, if the first surface tension of the first substrate 1 is greater than the second surface tension of the second substrate 2, the inks are adhered to the first substrate 1 (Fig. 2). An application of the first embodiment (Fig. 1) is to provide an opaque base layer by means of a white ink in a wet to wet printing process using aqueous inks curable by electron beam radiation. An application of the second embodiment (Fig. 2) is that of providing a final surface finish to aqueous inks curable by wet beam radiation printed wet on wet on a substrate. The method of the first and second embodiments of the present invention has in common the following steps. First, successively print wet on wet, by means of a plurality of printing stations 3, 3a, various colors on a first substrate 1 with aqueous inks 8 curable by electron beam radiation, said first substrate 1 having a first surface tension. Then, to attach and press a second substrate 2 on the printed face of said first substrate 1 in a roller pressure station 4, said second substrate 2 having a second surface tension. Then irradiate, in a curing station 5, an electronic beam on the set of the first and second overlapping substrates 1, 2 and with the inks 8 between them for curing the inks 8. Finally, separate the second substrate 2 from the first substrate 1 in a separation station 6, the cured inks 8 remaining adhered to the first substrate 1 or transferred to the second substrate 2 as a function of a relationship between said first and second surface tensions of the first and second substrates 1, 2.
Un experto en Ia materia será capaz de introducir variaciones y modificaciones en los ejemplos de realización mostrados y descritos sin salirse del alcance de Ia presente invención según está definido en las reivindicaciones adjuntas. One skilled in the art will be able to introduce variations and modifications in the examples of embodiment shown and described without departing from the scope of the present invention as defined in the appended claims.

Claims

REIVINDICACIONES
1.- Sistema para impresión de substratos con tintas acuosas curables por radiación de haz electrónico, que comprende, en combinación: - una pluralidad de estaciones de impresión (3, 3a) para imprimir sucesivamente húmedo sobre húmedo varios colores sobre un primer substrato (1) con tintas (8) acuosas curables por radiación de haz electrónico, teniendo dicho primer substrato (1) una primera tensión superficial; - una estación de presión por rodillos (4) para adosar y presionar un segundo substrato (2) sobre Ia cara impresa de dicho primer substrato (1 ), teniendo dicho segundo substrato (2) una segunda tensión superficial;1.- System for printing substrates with aqueous inks curable by electron beam radiation, comprising, in combination: - a plurality of printing stations (3, 3a) for printing successively wet on wet several colors on a first substrate (1 ) with aqueous inks (8) curable by electron beam radiation, said first substrate (1) having a first surface tension; - a roller pressure station (4) for attaching and pressing a second substrate (2) on the printed face of said first substrate (1), said second substrate (2) having a second surface tension;
- una estación de curado (5) para irradiar un haz electrónico sobre el conjunto de los primer y segundo substratos (1 , 2) superpuestos y con las tintas (8) entre ambos para el curado de las tintas (8); y- a curing station (5) for irradiating an electronic beam on the set of the first and second substrates (1, 2) superimposed and with the inks (8) between them for curing the inks (8); Y
- una estación de separación (6) para separar el segundo substrato (2) del primer substrato (1), donde las tintas (8) curadas quedan adheridas al primer substrato (1 ) o transferidas al segundo substrato (2) en función de una relación entre dichas primera y segunda tensiones superficiales de los primer y segundo substratos (1 , 2).- a separation station (6) to separate the second substrate (2) from the first substrate (1), where the cured inks (8) are adhered to the first substrate (1) or transferred to the second substrate (2) as a function of a relationship between said first and second surface tensions of the first and second substrates (1, 2).
2.- Sistema, de acuerdo con Ia reivindicación 1 , caracterizado porque Ia segunda tensión superficial del segundo substrato (2) es mayor que Ia primera tensión superficial del primer substrato (1), en virtud de Io cual, las tintas (8) curadas son transferidas desde el primer substrato (1 ) al segundo substrato (2), con las capas de tinta de diferentes colores en el orden inverso a como han sido impresas.2. System, according to claim 1, characterized in that the second surface tension of the second substrate (2) is greater than the first surface tension of the first substrate (1), by virtue of which, the inks (8) cured they are transferred from the first substrate (1) to the second substrate (2), with the ink layers of different colors in the reverse order as they have been printed.
3.- Sistema, de acuerdo con Ia reivindicación 2, caracterizado porque una de dichas estaciones de impresión (3, 3a) es una estación de impresión de color blanco (3a) adaptada para imprimir una tinta de color blanco en el último lugar antes de que el primer substrato (1 ) entre en dicha estación de presión por rodillos (4). 3. System, according to claim 2, characterized in that one of said printing stations (3, 3a) is a white printing station (3a) adapted to print a white ink in the last place before that the first substrate (1) enters said roller pressure station (4).
4.- Sistema, de acuerdo con Ia reivindicación 3, caracterizado porque las tintas (8) acuosas curables por radiación de haz electrónico tienen un contenido de agua de un 25% a un 30%, excepto dicha tinta de color blanco, Ia cual tiene un contenido en agua de un 5% a un 10% y un contenido en sólidos de un 35% a un 45%.4. System, according to claim 3, characterized in that the aqueous inks (8) curable by electron beam radiation have a water content of 25% to 30%, except said white ink, which has a water content of 5% to 10% and a solids content of 35% to 45%.
5.- Sistema, de acuerdo con Ia reivindicación 3, caracterizado porque el primer substrato (1 ) es en Ia forma de una banda continua que es desenrollada de una primera bobina (9) antes de entrar en las estaciones de impresión (3, 3a) y enrollada en una tercera bobina (10) después de salir de dicha estación de separación (6), siendo dicha primera bobina (9) reemplazable por dicha tercera bobina (10) para reutilizar el primer substrato (1 ).5. System, according to claim 3, characterized in that the first substrate (1) is in the form of a continuous band that is unwound from a first reel (9) before entering the printing stations (3, 3a ) and wound in a third coil (10) after leaving said separation station (6), said first coil (9) being replaceable by said third coil (10) to reuse the first substrate (1).
6.- Sistema, de acuerdo con Ia reivindicación 5, caracterizado porque el segundo substrato (2) es en Ia forma de una banda continua que es desenrollada de una segunda bobina (11 ) antes de entrar en Ia estación de presión por rodillos (4) y enrollada, junto con las tintas (8) curadas transferidas al mismo, en una cuarta bobina (12) después de salir de Ia estación de separación6. System, according to claim 5, characterized in that the second substrate (2) is in the form of a continuous band that is unwound from a second coil (11) before entering the roller pressure station (4 ) and rolled, together with the cured inks (8) transferred to it, in a fourth coil (12) after leaving the separation station
(6).(6).
7.- Sistema, de acuerdo con una cualquiera de las reivindicaciones 2 a 6, caracterizado porque una cara del primer substrato (1 ) a ser impresa con las tintas (8) comprende un acabado superficial (13) seleccionado de un grupo que comprende diferentes grados de rugosidad, desde brillante a mate, y microrrelieve, quedando dicho acabado superficial (13) copiado en negativo a las tintas (8) curadas transferidas al segundo substrato (2).7. System according to any one of claims 2 to 6, characterized in that a face of the first substrate (1) to be printed with the inks (8) comprises a surface finish (13) selected from a group comprising different degrees of roughness, from glossy to matt, and micro relief, said surface finish (13) being copied in negative to the cured inks (8) transferred to the second substrate (2).
8.- Sistema, de acuerdo con Ia reivindicación 1 , caracterizado porque una cara del segundo substrato (2) a ser superpuesta a las tintas (8) impresas sobre el primer substrato (1 ) comprende un acabado superficial (18) seleccionado de un grupo que comprende diferentes grados de rugosidad, desde brillante a mate, y microrrelieve, y porque Ia primera tensión superficial del primer substrato (1 ) es mayor que Ia segunda tensión superficial del segundo substrato (2), en virtud de Io cual, las tintas (8) curadas permanecen adheridas al primer substrato (1 ), quedando dicho acabado superficial (18) copiado en negativo a las tintas (8) adheridas al primer substrato (1). 8. System, according to claim 1, characterized in that a face of the second substrate (2) to be superimposed on the inks (8) printed on the first substrate (1) comprises a surface finish (18) selected from a group comprising different degrees of roughness, from glossy to matt, and micro relief, and because the first surface tension of the first substrate (1) is greater than the second surface tension of the second substrate (2), by virtue of which, the inks ( 8) Cured remains adhered to the first substrate (1), said surface finish (18) being copied negatively to the inks (8) adhered to the first substrate (1).
9.- Sistema, de acuerdo con Ia reivindicación 8, caracterizado porque el primer substrato (1) es en Ia forma de una banda continua que es desenrollada de una primera bobina (9) antes de entrar en las estaciones de impresión (3, 3a) y enrollada, junto con las tintas (8) curadas adheridas al mismo, en una tercera bobina (10) después de salir de dicha estación de separación (6).9. System, according to claim 8, characterized in that the first substrate (1) is in the form of a continuous band that is unwound from a first reel (9) before entering the printing stations (3, 3a ) and wound, together with the cured inks (8) adhered thereto, in a third reel (10) after leaving said separation station (6).
10.- Sistema, de acuerdo con Ia reivindicación 9, caracterizado porque el segundo substrato (2) es en Ia forma de una banda continua que es desenrollada de una segunda bobina (11 ) antes de entrar en Ia estación de presión por rodillos (4) y enrollada en una cuarta bobina (12) después de salir de Ia estación de separación (6), siendo dicha segunda bobina (11) reemplazable por dicha cuarta bobina (12) para reutilizar el segundo substrato (2).10. System, according to claim 9, characterized in that the second substrate (2) is in the form of a continuous band that is unwound from a second coil (11) before entering the roller pressure station (4 ) and wound in a fourth coil (12) after leaving the separation station (6), said second coil (11) being replaceable by said fourth coil (12) to reuse the second substrate (2).
11.- Sistema, de acuerdo con una cualquiera de las reivindicaciones 1 a11. System according to any one of claims 1 to
10, caracterizado porque las estaciones de impresión (3, 3a) están dispuestas alrededor de un tambor central de impresión (7) para imprimir los colores en el primer substrato (1) soportado dinámicamente sobre dicho tambor central de impresión (7).10, characterized in that the printing stations (3, 3a) are arranged around a central printing drum (7) to print the colors on the first substrate (1) dynamically supported on said central printing drum (7).
12.- Sistema, de acuerdo con una cualquiera de las reivindicaciones 1 a12. System, according to any one of claims 1 to
10, caracterizado porque cada una de las estaciones de impresión (3, 3a) tiene asociado un tambor de impresión propio para imprimir su correspondiente color en el primer substrato (1) soportado dinámicamente sobre dicho tambor de impresión.10, characterized in that each of the printing stations (3, 3a) has an associated printing drum for printing its corresponding color on the first substrate (1) dynamically supported on said printing drum.
13.- Sistema, de acuerdo con una cualquiera de las reivindicaciones 1 a 10, caracterizado porque Ia estación de presión por rodillos (4) comprende unos medios de guiado para hacer pasar los primer y segundo substratos (1 , 2) superpuestos y con las tintas (8) entre ambos por el apriete de al menos un par de rodillos de presión (14, 15) enfrentados y empujados el uno hacia el otro por unos medios de presión (16) con una presión controlada.13. System according to any one of claims 1 to 10, characterized in that the roller pressure station (4) comprises guiding means for passing the first and second substrates (1, 2) superimposed and with the inks (8) between them by the tightening of at least one pair of pressure rollers (14, 15) facing and pushed towards each other by means of pressure (16) with a controlled pressure.
14.- Sistema, de acuerdo con Ia reivindicación 13, caracterizado porque comprende unos medios para mantener los primer y segundo substratos (1 , 2) superpuestos y con las tintas (8) entre ambos mientras pasan enfrente de un aparato emisor de haz electrónico (17) en dicha estación de curado (5).14. System, according to claim 13, characterized in that it comprises means for keeping the first and second substrates (1, 2) superimposed and with the inks (8) between them while they pass in front of an electronic beam emitting apparatus ( 17) in said curing station (5).
15.- Método para impresión de substratos con tintas acuosas curables por radiación de haz electrónico, que comprende, en combinación, los pasos de: - imprimir sucesivamente húmedo sobre húmedo, mediante una pluralidad de estaciones de impresión (3, 3a), varios colores sobre un primer substrato (1 ) con tintas (8) acuosas curables por radiación de haz electrónico, teniendo dicho primer substrato (1 ) una primera tensión superficial;15.- Method for printing substrates with aqueous inks curable by electron beam radiation, comprising, in combination, the steps of: - printing successively wet on wet, by means of a plurality of printing stations (3, 3a), various colors on a first substrate (1) with aqueous inks (8) curable by electron beam radiation, said first substrate (1) having a first surface tension;
- adosar y presionar un segundo substrato (2) sobre Ia cara impresa de dicho primer substrato (1 ) en una estación de presión por rodillos (4), teniendo dicho segundo substrato (2) una segunda tensión superficial; - irradiar, en una estación de curado (5), un haz electrónico sobre el conjunto de los primer y segundo substratos (1 , 2) superpuestos y con las tintas (8) entre ambos para el curado de las tintas (8); y- to attach and press a second substrate (2) on the printed face of said first substrate (1) in a roller pressure station (4), said second substrate (2) having a second surface tension; - irradiating, in a curing station (5), an electronic beam on the set of the first and second substrates (1, 2) superimposed and with the inks (8) between them for the curing of the inks (8); Y
- separar el segundo substrato (2) del primer substrato (1) en una estación de separación (6), quedando las tintas (8) curadas adheridas al primer substrato (1 ) o transferidas al segundo substrato (2) en función de una relación entre dichas primera y segunda tensiones superficiales de los primer y segundo substratos (1 , 2).- separating the second substrate (2) from the first substrate (1) in a separation station (6), the cured inks (8) remaining adhered to the first substrate (1) or transferred to the second substrate (2) depending on a relationship between said first and second surface tensions of the first and second substrates (1, 2).
16.- Método, de acuerdo con Ia reivindicación 15, caracterizado porque comprende proporcionar Ia segunda tensión superficial del segundo substrato (2) mayor que Ia primera tensión superficial del primer substrato (1), en virtud de Io cual, las tintas (8) curadas son transferidas desde el primer substrato (1 ) al segundo substrato (2), con las capas de tinta de diferentes colores en el orden inverso a como han sido impresas. 16. Method according to claim 15, characterized in that it comprises providing the second surface tension of the second substrate (2) greater than the first surface tension of the first substrate (1), by virtue of which, the inks (8) Cured are transferred from the first substrate (1) to the second substrate (2), with the ink layers of different colors in the reverse order as they have been printed.
17.- Método, de acuerdo con Ia reivindicación 16, caracterizado porque comprende imprimir, mediante una de dichas estaciones de impresión (3, 3a), Ia cual es una estación de impresión de color blanco (3a), una tinta de color blanco en el último lugar antes de que el primer substrato (1) entre en dicha estación de presión por rodillos (4). 17. Method according to claim 16, characterized in that it comprises printing, by means of one of said printing stations (3, 3a), which is a white printing station (3a), a white ink in the last place before the first substrate (1) enters said roller pressure station (4).
18.- Método, de acuerdo con Ia reivindicación 17, caracterizado porque comprende utilizar las tintas (8) acuosas curables por radiación de haz electrónico con un contenido de agua de un 25% a un 30%, excepto dicha tinta de color blanco, Ia cual tiene un contenido en agua de un 5% a un 10% y un contenido en sólidos de un 35% a un 45%.18. Method according to claim 17, characterized in that it comprises using aqueous inks (8) curable by electron beam radiation with a water content of 25% to 30%, except said ink white, which has a water content of 5% to 10% and a solids content of 35% to 45%.
19.- Método, de acuerdo con Ia reivindicación 17, caracterizado porque comprende desenrollar el primer substrato (1 ), el cual es en Ia forma de una banda continua, de una primera bobina (9), antes de entrar en las estaciones de impresión (3, 3a) y enrollarlo en una tercera bobina (10) después de salir de dicha estación de separación (6).19. Method, according to claim 17, characterized in that it comprises unwinding the first substrate (1), which is in the form of a continuous band, of a first reel (9), before entering the printing stations (3, 3a) and wind it in a third coil (10) after leaving said separation station (6).
20.- Método, de acuerdo con Ia reivindicación 19, caracterizado porque comprende reemplazar dicha primera bobina (9) por dicha tercera bobina (10) para reutilizar el primer substrato (1 ).20. Method according to claim 19, characterized in that it comprises replacing said first coil (9) with said third coil (10) to reuse the first substrate (1).
21.- Método, de acuerdo con Ia reivindicación 19, caracterizado porque comprende desenrollar el segundo substrato (2), el cual es en Ia forma de una banda continua, de una segunda bobina (11 ) antes de entrar en Ia estación de presión por rodillos (4) y enrollarlo, junto con las tintas (8) curadas transferidas al mismo, en una cuarta bobina (12) después de salir de Ia estación de separación21. Method according to claim 19, characterized in that it comprises unwinding the second substrate (2), which is in the form of a continuous band, of a second coil (11) before entering the pressure station by rollers (4) and wind it, together with the cured inks (8) transferred to it, in a fourth coil (12) after leaving the separation station
(6).(6).
22.- Método, de acuerdo con una cualquiera de las reivindicaciones 16 a 21 , caracterizado porque comprende proporcionar un acabado superficial (13) seleccionado de un grupo que comprende diferentes grados de rugosidad, desde brillante a mate, y microrrelieve, a una cara del primer substrato (1) a ser impresa con las tintas (8) con el fin de que dicho acabado superficial (13) quede copiado en negativo a las tintas (8) curadas transferidas al segundo substrato22. Method according to any one of claims 16 to 21, characterized in that it comprises providing a surface finish (13) selected from a group comprising different degrees of roughness, from glossy to matt, and micro relief, to one side of the first substrate (1) to be printed with the inks (8) so that said surface finish (13) is negatively copied to the cured inks (8) transferred to the second substrate
(2).(2).
23.- Método, de acuerdo con Ia reivindicación 15, caracterizado porque comprende proporcionar un acabado superficial (18) seleccionado de un grupo que comprende diferentes grados de rugosidad, desde brillante a mate, y microrrelieve, a una cara del segundo substrato (2) a ser superpuesta a las tintas (8) impresas sobre el primer substrato (1 ), y porque comprende proporcionar Ia primera tensión superficial del primer substrato (1) mayor que Ia segunda tensión superficial del segundo substrato (2), en virtud de Io cual, las tintas (8) curadas permanecen adheridas al primer substrato (1 ), quedando dicho acabado superficial (18) copiado en negativo a las tintas (8) adheridas al primer substrato (1). 23.- Method, according to claim 15, characterized in that it comprises providing a surface finish (18) selected from a group comprising different degrees of roughness, from glossy to matt, and micro relief, to a face of the second substrate (2) to be superimposed on the inks (8) printed on the first substrate (1), and because it comprises providing the first surface tension of the first substrate (1) greater than the second surface tension of the second substrate (2), by virtue of which , the cured inks (8) remain adhered to the first substrate (1), said surface finish (18) being copied negatively to the inks (8) adhered to the first substrate (1).
24.- Método, de acuerdo con Ia reivindicación 23, caracterizado porque comprende desenrollar el primer substrato (1), el cual es en Ia forma de una banda continua, de una primera bobina (9), antes de entrar en las estaciones de impresión (3, 3a) y enrollarlo, junto con las tintas (8) curadas adheridas al mismo, en una tercera bobina (10) después de salir de dicha estación de separación (6).24.- Method, according to claim 23, characterized in that it comprises unwinding the first substrate (1), which is in the form of a continuous band, of a first reel (9), before entering the printing stations (3, 3a) and roll it, together with the cured inks (8) adhered thereto, in a third coil (10) after leaving said separation station (6).
25.- Método, de acuerdo con Ia reivindicación 24, caracterizado porque comprende desenrollar el segundo substrato (2), el cual es en Ia forma de una banda continua, de una segunda bobina (11) antes de entrar en Ia estación de presión por rodillos (4) y enrollarlo en una cuarta bobina (12) después de salir de Ia estación de separación (6).25.- Method, according to claim 24, characterized in that it comprises unwinding the second substrate (2), which is in the form of a continuous band, of a second coil (11) before entering the pressure station by rollers (4) and wind it in a fourth coil (12) after leaving the separation station (6).
26.- Método, de acuerdo con Ia reivindicación 25, caracterizado porque comprende reemplazar dicha segunda bobina (11) por dicha cuarta bobina (12) para reutilizar el segundo substrato (2). 26.- Method, according to claim 25, characterized in that it comprises replacing said second coil (11) with said fourth coil (12) to reuse the second substrate (2).
27.- Método, de acuerdo con una cualquiera de las reivindicaciones 15 a27.- Method, according to any one of claims 15 to
26, caracterizado porque comprende hacer pasar, con Ia ayuda de unos medios de guiado dispuestos en Ia estación de presión por rodillos (4), los primer y segundo substratos (1 , 2) superpuestos y con las tintas (8) entre ambos por el apriete de al menos un par de rodillos de presión (14, 15) enfrentados mientras dicho par de rodillos de presión (14, 15) son empujados el uno hacia el otro por unos medios de presión (16) con una presión controlada.26, characterized in that it comprises passing, with the aid of guiding means arranged in the roller pressure station (4), the first and second substrates (1, 2) superimposed and with the inks (8) between them by the tighten at least one pair of pressure rollers (14, 15) facing each other while said pair of pressure rollers (14, 15) are pushed towards each other by means of pressure (16) with a controlled pressure.
28.- Método, de acuerdo con Ia reivindicación 27, caracterizado porque comprende mantener los primer y segundo substratos (1 , 2) superpuestos y con las tintas (8) entre ambos mientras pasan enfrente de un aparato emisor de haz electrónico (17) en dicha estación de curado (5). 28.- Method, according to claim 27, characterized in that it comprises keeping the first and second substrates (1, 2) superimposed and with the inks (8) between them while passing in front of an electronic beam emitting apparatus (17) in said curing station (5).
PCT/ES2006/000547 2005-10-06 2006-09-29 System and method for printing on substrates with aqueous inks that can be cured by means of electron beam radiation WO2007039656A2 (en)

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ES200502424A ES2277535B1 (en) 2005-10-06 2005-10-06 SYSTEM AND METHOD FOR PRINTING SUBSTRATES WITH CURABLE WATERY INKS BY ELECTRONIC BEAM RADIATION.
ESP200502424 2005-10-06

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CN108481897A (en) * 2018-03-20 2018-09-04 广州通泽机械有限公司 A kind of instant curing type compounding machine of stacked flexible printing machine line EB irradiation
CN108481896A (en) * 2018-03-20 2018-09-04 广州通泽机械有限公司 A kind of instant curing type compounding machine of satellite-type flexible printing machine line EB irradiation

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US5690028A (en) * 1996-06-06 1997-11-25 Cavanagh Corporation Wet trapping method and apparatus for low viscosity radiation cured print
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CN108481896A (en) * 2018-03-20 2018-09-04 广州通泽机械有限公司 A kind of instant curing type compounding machine of satellite-type flexible printing machine line EB irradiation

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