WO2012001186A1 - Central-drum flexographic machine for the application of inks capable of undergoing a liquid/gel phase change - Google Patents
Central-drum flexographic machine for the application of inks capable of undergoing a liquid/gel phase change Download PDFInfo
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- WO2012001186A1 WO2012001186A1 PCT/ES2011/000216 ES2011000216W WO2012001186A1 WO 2012001186 A1 WO2012001186 A1 WO 2012001186A1 ES 2011000216 W ES2011000216 W ES 2011000216W WO 2012001186 A1 WO2012001186 A1 WO 2012001186A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/002—Heating or cooling of ink or ink rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
- B41F31/027—Ink rail devices for inking ink rollers
Definitions
- the present invention concerns a central drum flexographic machine that uses inks capable of experiencing a phase change between liquid and gel, and comprising temperature control means for causing the phase changes of the ink and keeping the ink in the desired phase in the different stages of the printing process.
- a printing ink which is at rest and at room temperature is in a gel state, and which changes from a gel state to a liquid state by stirring and / or heating and from a liquid state to a gel state by cooling.
- the aforementioned ink when in a gel state on a substrate, has sufficient strength to withstand a subsequent printing of ink in a liquid state on it.
- the ink is curable by electron beam or by ultraviolet radiation.
- Said ink may be used in a flexographic printing process comprising printing a first layer of said ink in a liquid state on a substrate and changing said first layer of printed ink to the gel state. Then print a second layer of ink in liquid state on the first previously gelled layer and change said second layer of printed ink to the gel state, and so on until a number of ink layers have been printed on the substrate and changed to state gel. And finally cure all gelled ink layers using an electron beam or ultraviolet radiation.
- means for heating or for shearing forces the ink should be provided in order to change the ink from the gel state to an appropriate liquid state to be applied by the ink printing system present in the printing machine.
- the present invention provides a proposal for a flexographic machine prepared to use an ink capable of experiencing a phase change between liquid and gel, where means for treating the ink by heating and in particular how and at what stages of the process of processing are explained.
- Printing of the flexographic machine such means act to heat the ink as well as what means are used to convert the printed liquid ink on the substrate back to the gel state.
- the invention concerns a central drum flexographic machine for application of inks capable of experiencing a phase change between liquid and gel, comprising heating means for heating said ink and at least two printing groups, each with an inking roller and a clichés roller, to apply the ink on a substrate supported on said central drum, in which machine the inking roller as well as said clichés roller include first temperature control means to control the temperature of at least one surface thereof at a value (T
- each of said printing groups comprises a scraper device for applying ink to the inking roller, and said scraper device comprises an ink chamber and third temperature control means for regulating the ink temperature inside said ink chamber at a value (T
- the ink chamber of each scraper device receives the ink in a liquid state from a tank provided with a fourth temperature control means to control the temperature of the ink inside said tank at a value ( T
- said reservoir is connected to said ink chamber by means of ink circulation composed of several elements, and one or more of said elements are thermally insulated or provided with fifth temperature control means to control the temperature of the ink inside said elements at a value (T
- each of said printing groups comprises an ink tray and at least one ink transfer roller. in contact with the ink inside said ink bucket to apply the ink to the ink roller, and because said ink bucket comprises sixth temperature control means to control the temperature of the ink inside the ink bucket to a value (T
- said ink transfer roller comprises seventh temperature control means for controlling the temperature of a surface thereof at a value (T
- each of the printing groups may further comprise one or more intermediate ink transfer rollers for transferring the ink from the ink transfer roller to the inking roller, and at least one of said intermediate ink transfer rollers comprises eighth temperature control means for controlling the temperature of a surface thereof at a value (T
- an air blowing device may be arranged downstream of each printing group to apply a jet of cold air or air at room temperature on the ink just applied to the substrate by the previous printing group, to cooperate in said transition of the ink to gel state, to improve the speed performance of the machine.
- the first, third, fourth, fifth, sixth, seventh and eighth temperature control means generally comprise a heating device that is associated with an automatic regulation equipment to regulate the operation of said heating device and provide an operation within of the mentioned ranges of values.
- said second temperature control means comprise a simple or mixed cooling device (one or several grouped cooling means) that is associated with an automatic regulation equipment to regulate the operation of said cooling device within a range of preset temperature values.
- Fig. 1 is a schematic diagram of a flexographic drum printing machine central with two printing groups and with suitable temperature regulation systems for printing with said inks.
- Fig. 2 is a schematic diagram of one of said printing groups according to a first embodiment in which the ink is supplied by means of a scraper chamber, and in which said chamber has a means of regulating temperature to have the ink in the temperature range T Nq suitable for transfer.
- Fig. 3 is a schematic diagram of the ink supply system according to a first embodiment by means of a scraper chamber, with an ink tank and temperature regulating means for maintaining the temperature of the ink in the tank at a T value.
- ⁇ Q4 within said first temperature range.
- Fig. 4 is a schematic diagram of the ink circulation ducts from the tank to the scraper chamber with its maintenance / temperature regulation system.
- Fig. 5 is a schematic diagram of a flexographic printing machine with two printing groups (according to a first embodiment with a scraper chamber) and with all the first, second, temperature regulation systems.
- Fig. 6 is a schematic diagram of one of said printing groups according to a second embodiment, in which the ink is supplied by a transfer roller which is bathed in an ink tray.
- Fig. 7 is a schematic diagram of one of said printing groups according to a second embodiment, with the variant having intermediate ink transfer rollers.
- Fig. 8 is a schematic diagram of a flexographic machine with two printing groups and with an air blow screen to help cool the temperature of the ink already applied on the substrate and keep it at said second temperature range T ge i wherein the ink is in an appropriate gel state to receive a subsequent application of ink from the subsequent printing group.
- Said flexographic printing machine generally comprises one or more printing groups 21 (only two of which are shown in Fig. 1) adapted to print said printing inks on a substrate band 23 supported on at least one backpressure roller. 24.
- the flexographic printer could have a single print group 21 and a single back pressure roller 24 or several print groups 21 each associated with a corresponding back pressure roller 24.
- Printing inks susceptible to phase change depending on the temperature have a first temperature range T
- Said inks are suitable for a wet to wet printing method according to which, when the flexographic printer has several printing groups 21, they print the inks (which are at a temperature T
- Each printing group 21 comprises (Fig. 2) an ink application chamber 13 adapted to apply the printing ink to a honeycomb surface of an inking roller 1 1 arranged to in turn inking a printing roller 12 (holder of a cliché printing) which rotates in contact with the substrate band 23 that moves supported on the counterpressure roller 24.
- the flexographic printer includes ink supply means comprising an ink reservoir 1, an ink supply line 6 connected to an input of the corresponding ink application chamber 13 and an ink return line 7 from an output of the ink application chamber 13 to the ink reservoir 1.
- a pump 8 is arranged in said ink supply line 6 to impel the ink along the supply circuit and return, and a second pump 9 may also be arranged in the return circuit to extract the ink from the scraper chamber and return it to the reservoir.
- the device of the present invention comprises, for each printing group 21, means for keeping the temperature of said printing ink substantially constant within a range of temperatures T Nq in which the ink is in a liquid state and can therefore both be easily transferred from one of the elements to the other (13, 11, 12).
- T Nq a range of temperatures in which the ink is in a liquid state
- FIG. 6 An alternative embodiment of the device of the present invention is shown in Fig. 6 which is analogous to the embodiment described above in relation to the previous figures, except that, here, the contribution of the ink to the inking roller or anilox it is not carried out by means of a scraper chamber 13 with its ink feeding systems, but it is carried out by means of an inking roller 30 which, bathed in a bucket full of ink 31, supplies the ink to the anilox roller 11.
- said ink supply roller 30 and the ink tray 31 are maintained at a temperature in the interval T
- FIG. 7 another alternative embodiment of the device of the present invention is shown, according to the embodiment of Figure 6 in which between the inking roller 30 and the anilox roller 11 several rollers 32 and 33 are interleaved which by different speeds of rotation They are laminating the ink layer to leave the layer with the thickness necessary for printing on the anilox roller 11.
- said intermediate rollers 32 and 33 must also have their own temperature regulation systems to keep the ink at all times within the interval T
- FIG 8 we can see an alternative embodiment in which between two printing groups a cold air blowing unit 34 is inserted to improve the speed in which the ink passes from a first temperature range T
- This device is especially indicated in the case of high printing speeds, in which even if the surface of the drum and the substrate is within the temperature range T ge i, the short time elapsed between one printing station and the next causes that by transfer from thermal is not achieved that the ink reaches the temperature range T ge i necessary to move to the gel state and thus be able to apply the following ink. With the blowing of cold air, a change in temperature (and a good condition) is achieved much faster.
Abstract
The flexographic machine comprises multiple printing units each including an inking roller and a plate-bearing roller for printing on a substrate (23) supported by a central drum (24). According to the invention, the inking (11) and plate-bearing (12) rollers include means for controlling the temperature of at least one surface of the rollers at a value within a first pre-determined range of temperature values in order to ensure that the ink that is in contact with said surface is in a liquid phase, and the central drum (24) includes means for controlling the temperature of the surface thereof at a value within a second pre-determined range of temperature values in order to ensure that the ink applied to the substrate (23) supported by the surface of the central drum undergoes and retains a change of phase to gel.
Description
MÁQUINA FLEXOGRÁFICA DE TAMBOR CENTRAL PARA APLICACIÓN DE TINTAS SUSCEPTIBLES DE EXPERIMENTAR UN CAMBIO DE FASE ENTRE LÍQUIDO Y CENTRAL DRUM FLEXOGRAPHIC MACHINE FOR APPLICATION OF SUSCEPTIBLE INKS TO EXPERIENCE A PHASE CHANGE BETWEEN LIQUID AND
GEL GEL
Campo de la técnica Technical field
La presente invención concierne a una máquina flexográfica de tambor central que utiliza unas tintas susceptibles de experimentar un cambio de fase entre líquido y gel, y que comprende unos medios de control de temperatura para ocasionar los cambios de fase de la tinta y mantener la tinta en la fase deseada en los diferentes estadios del proceso de impresión. The present invention concerns a central drum flexographic machine that uses inks capable of experiencing a phase change between liquid and gel, and comprising temperature control means for causing the phase changes of the ink and keeping the ink in the desired phase in the different stages of the printing process.
Antecedentes de la invención Background of the invention
Por la WO 2010/071952 se conoce una tinta de impresión que en reposo y a temperatura ambiente está en estado gel, y que cambia de estado gel a estado líquido por agitación y/o calentamiento y de estado líquido a estado gel por enfriamiento. La mencionada tinta, cuando está en estado gel sobre un sustrato, tiene una resistencia suficiente para soportar una subsiguiente impresión de tinta en estado líquido sobre la misma. La tinta es curable por haz de electrones o por radiación ultravioleta. From WO 2010/071952 a printing ink is known which is at rest and at room temperature is in a gel state, and which changes from a gel state to a liquid state by stirring and / or heating and from a liquid state to a gel state by cooling. The aforementioned ink, when in a gel state on a substrate, has sufficient strength to withstand a subsequent printing of ink in a liquid state on it. The ink is curable by electron beam or by ultraviolet radiation.
La citada solicitud de patente también describe que la citada tinta es aplicable a una máquina flexográfica. The said patent application also describes that said ink is applicable to a flexographic machine.
La citada tinta puede ser empleada en un proceso de impresión flexográfico que comprende imprimir una primera capa de dicha tinta en estado líquido sobre un sustrato y cambiar dicha primera capa de tinta impresa al estado gel. A continuación imprimir una segunda capa de tinta en estado líquido sobre la primera capa previamente gelificada y cambiar dicha segunda capa de tinta impresa al estado gel, y así sucesivamente hasta que un número de capas de tinta han sido impresas sobre el sustrato y cambiadas a estado gel. Y finalmente curar todas las capas de tinta gelificadas usando un haz de electrones o radiación ultravioleta. Para una tal aplicación deberán preverse medios para calentar o para someter a fuerzas de cizalla la tinta con el fin de cambiar la tinta del estado gel a un estado líquido apropiado para ser aplicada por el sistema de impresión de tinta presente en la máquina impresora,. Said ink may be used in a flexographic printing process comprising printing a first layer of said ink in a liquid state on a substrate and changing said first layer of printed ink to the gel state. Then print a second layer of ink in liquid state on the first previously gelled layer and change said second layer of printed ink to the gel state, and so on until a number of ink layers have been printed on the substrate and changed to state gel. And finally cure all gelled ink layers using an electron beam or ultraviolet radiation. For such an application, means for heating or for shearing forces the ink should be provided in order to change the ink from the gel state to an appropriate liquid state to be applied by the ink printing system present in the printing machine.
La presente invención aporta una propuesta de una máquina flexográfica preparada para utilizar una tinta susceptible de experimentar un cambio de fase entre líquido y gel, en donde se explican unos medios para tratar la tinta por calentamiento y en particular cómo y en qué estadios del proceso de impresión de la máquina flexográfica actúan dichos medios para calentar la tinta así como qué medios son utilizados para convertir la tinta líquida impresa sobre el sustrato de nuevo al estado gel.
Breve explicación de la invención The present invention provides a proposal for a flexographic machine prepared to use an ink capable of experiencing a phase change between liquid and gel, where means for treating the ink by heating and in particular how and at what stages of the process of processing are explained. Printing of the flexographic machine such means act to heat the ink as well as what means are used to convert the printed liquid ink on the substrate back to the gel state. Brief Explanation of the Invention
La invención concierne a una máquina flexográfica de tambor central para aplicación de tintas susceptibles de experimentar un cambio de fase entre líquido y gel, comprendiendo unos medios de calentamiento para calentar dicha tinta y al menos dos grupos de impresión, cada uno con un rodillo entintador y un rodillo porta-clichés, para aplicar la tinta sobre un sustrato soportado en dicho tambor central, en cual máquina el rodillo entintador así como el dicho rodillo porta-clichés incluyen unos primeros medios de control de temperatura para controlar la temperatura de al menos una superficie de los mismos a un valor (T|iq ; T|¡q2) comprendido dentro de un primer rango de valores de temperatura predeterminado (Ti<Tiiq<T2) para asegurar que la tinta en contacto con dicha superficie esté en una fase líquida, y el citado tambor central incluye unos segundos medios de control de temperatura para controlar la temperatura de al menos una superficie del tambor a un valor (Tgen) dentro de un segundo rango de valores de temperatura predeterminado (Τ3<Τ9βι<Τ4) para asegurar que la tinta, una vez aplicada sobre dicho sustrato, soportado en dicha superficie del tambor central, experimente y conserve un cambio de fase a gel. The invention concerns a central drum flexographic machine for application of inks capable of experiencing a phase change between liquid and gel, comprising heating means for heating said ink and at least two printing groups, each with an inking roller and a clichés roller, to apply the ink on a substrate supported on said central drum, in which machine the inking roller as well as said clichés roller include first temperature control means to control the temperature of at least one surface thereof at a value (T | iq ; T | ¡ q2 ) within a first range of predetermined temperature values (Ti <Tii q <T 2 ) to ensure that the ink in contact with said surface is in a phase liquid, and said central drum includes a second temperature control means for controlling the temperature of at least one surface of the drum to a value (T ge n) within a second range of predetermined temperature values (Τ 3 <Τ 9β ι <Τ 4 ) to ensure that the ink, once applied on said substrate, supported on said central drum surface, experiences and retains a change in gel phase
En un ejemplo de realización cada uno de dichos grupos de impresión comprende un dispositivo de rasqueta para aplicar la tinta al rodillo entintador, y dicho dispositivo de rasqueta comprende una cámara de tinta y unos terceros medios de control de temperatura para regular la temperatura de la tinta en el interior de dicha cámara de tinta a un valor (T|¡q3) dentro de dicho primer rango de valores de temperatura predeterminado. In an exemplary embodiment each of said printing groups comprises a scraper device for applying ink to the inking roller, and said scraper device comprises an ink chamber and third temperature control means for regulating the ink temperature inside said ink chamber at a value (T | ¡ q3 ) within said first range of predetermined temperature values.
Conforme a dicho ejemplo de realización la cámara de tinta de cada dispositivo de rasqueta recibe la tinta en estado líquido desde un depósito provisto de unos cuartos medios de control de temperatura para controlar la temperatura de la tinta en el interior de dicho depósito a un valor (T|iq4) dentro de dicho primer rango de valores de temperatura predeterminado. According to said exemplary embodiment, the ink chamber of each scraper device receives the ink in a liquid state from a tank provided with a fourth temperature control means to control the temperature of the ink inside said tank at a value ( T | iq4 ) within said first range of predetermined temperature values.
Por otro lado se ha previsto que el citado depósito esté conectado a dicha cámara de tinta por unos medios de circulación de tinta compuestos por varios elementos, y uno o más de dichos elementos están aislados térmicamente o están provistos de unos quintos medios de control de temperatura para controlar la temperatura de la tinta en el interior de dichos elementos a un valor (T|¡q5)dentro de dicho primer rango de valores de temperatura predeterminado. On the other hand, it is provided that said reservoir is connected to said ink chamber by means of ink circulation composed of several elements, and one or more of said elements are thermally insulated or provided with fifth temperature control means to control the temperature of the ink inside said elements at a value (T | ¡ q5 ) within said first range of predetermined temperature values.
Conforme a un segundo ejemplo de realización, cada uno de dichos grupos de impresión comprende una cubeta de tinta y al menos un rodillo de transferencia de tinta
en contacto con la tinta en el interior de dicha cubeta de tinta para aplicar la tinta al rodillo entintador, y porque dicha cubeta de tinta comprende unos sextos medios de control de temperatura para controlar la temperatura de la tinta en el interior de la cubeta de tinta a un valor (T|iq6) dentro de dicho primer rango de valores de temperatura predeterminado. According to a second embodiment, each of said printing groups comprises an ink tray and at least one ink transfer roller. in contact with the ink inside said ink bucket to apply the ink to the ink roller, and because said ink bucket comprises sixth temperature control means to control the temperature of the ink inside the ink bucket to a value (T | iq6 ) within said first range of predetermined temperature values.
Según dicho segundo ejemplo de realización el citado rodillo de transferencia de tinta comprende unos séptimos medios de control de temperatura para controlar la temperatura de una superficie del mismo a un valor (T|iq7)dentro de dicho primer rango de valores de temperatura predeterminado. According to said second embodiment, said ink transfer roller comprises seventh temperature control means for controlling the temperature of a surface thereof at a value (T | i7 ) within said first range of predetermined temperature values.
También en dicho segundo ejemplo se ha previsto que cada uno de los grupos de impresión pueda comprender además uno o más rodillos de transferencia de tinta intermedios para transferir por laminación la tinta desde el rodillo de transferencia de tinta al rodillo entintador, y al menos uno de dichos rodillos de transferencia de tinta intermedios comprende unos octavos medios de control de temperatura para controlar la temperatura de una superficie del mismo a un valor (T|iq8) dentro de dicho primer rango de valores de temperatura predeterminado. Also in said second example it is provided that each of the printing groups may further comprise one or more intermediate ink transfer rollers for transferring the ink from the ink transfer roller to the inking roller, and at least one of said intermediate ink transfer rollers comprises eighth temperature control means for controlling the temperature of a surface thereof at a value (T | iq8 ) within said first range of predetermined temperature values.
En cualquiera de los dos ejemplos de realización se ha previsto que corriente abajo de cada grupo de impresión pueda estar dispuesto dispuesto un dispositivo de soplado de aire para aplicar un chorro de aire frío o aire a temperatura ambiente sobre la tinta recién aplicada al sustrato por el grupo de impresión precedente, para cooperar en dicha transición de la tinta a estado gel, para mejorar las prestaciones de velocidad de la máquina. In either of the two exemplary embodiments, it is provided that an air blowing device may be arranged downstream of each printing group to apply a jet of cold air or air at room temperature on the ink just applied to the substrate by the previous printing group, to cooperate in said transition of the ink to gel state, to improve the speed performance of the machine.
Los citados primeros, terceros, cuartos, quintos, sextos, séptimos y octavos medios de control de temperatura comprenden en general un dispositivo de calentamiento que está asociado a un equipo automático de regulación para regular el funcionamiento de dicho dispositivo de calentamiento y proporcionar una operativa dentro de los citados rangos de valores. The first, third, fourth, fifth, sixth, seventh and eighth temperature control means generally comprise a heating device that is associated with an automatic regulation equipment to regulate the operation of said heating device and provide an operation within of the mentioned ranges of values.
Por su parte los citados segundos medios de control de temperatura comprenden un dispositivo de enfriamiento simple o mixto (uno o varios medios de refrigeración agrupados) que está asociado a un equipo automático de regulación para regular el funcionamiento de dicho dispositivo de enfriamiento dentro de un rango de valores de temperatura prefijado. On the other hand, said second temperature control means comprise a simple or mixed cooling device (one or several grouped cooling means) that is associated with an automatic regulation equipment to regulate the operation of said cooling device within a range of preset temperature values.
Breve descripción de los dibujos
Las anteriores y otras características y ventajas se comprenderán más plenamente a partir de la siguiente descripción detallada de unos ejemplos de realización con referencia a los dibujos adjuntos, en los que: la Fig.1 es un diagrama esquemático de una maquina de impresión flexográfica de tambor central con dos grupos de impresión y con unos sistemas de regulación de temperatura adecuados para la impresión con dichas tintas. Brief description of the drawings The foregoing and other features and advantages will be more fully understood from the following detailed description of some embodiments with reference to the attached drawings, in which: Fig. 1 is a schematic diagram of a flexographic drum printing machine central with two printing groups and with suitable temperature regulation systems for printing with said inks.
La Fig.2 es un diagrama esquemático de uno de dichos grupos de impresión según un primer ejemplo de realización en el que la aportación de tinta se realiza por medio de una cámara de rasqueta, y en el que dicha cámara tiene unos medios de regulación de temperatura para tener la tinta en el intervalo de temperaturas TNq adecuado para la transferencia. Fig. 2 is a schematic diagram of one of said printing groups according to a first embodiment in which the ink is supplied by means of a scraper chamber, and in which said chamber has a means of regulating temperature to have the ink in the temperature range T Nq suitable for transfer.
La Fig.3 es un diagrama esquemático del sistema de aportación de tinta según una primera realización mediante una cámara de rasqueta, con un depósito de tinta y unos medios de regulación de temperatura para mantener la temperatura de la tinta en el depósito a un valor T|¡q4 dentro de dicho primer intervalo de temperatura. Fig. 3 is a schematic diagram of the ink supply system according to a first embodiment by means of a scraper chamber, with an ink tank and temperature regulating means for maintaining the temperature of the ink in the tank at a T value. | ¡Q4 within said first temperature range.
La Fig.4 es un diagrama esquemático de los conductos de circulación de tinta desde el depósito hasta la cámara de rasqueta con su sistema de mantenimiento/regulación de temperatura. Fig. 4 is a schematic diagram of the ink circulation ducts from the tank to the scraper chamber with its maintenance / temperature regulation system.
La Fig.5 es un diagráma esquemático de una máquina de impresión flexográfica con dos grupos impresores (según un primer ejemplo de realización con cámara de rasqueta) y con todos los primer, segundo, sistemas de regulación de temperatura. Fig. 5 is a schematic diagram of a flexographic printing machine with two printing groups (according to a first embodiment with a scraper chamber) and with all the first, second, temperature regulation systems.
La Fig.6 es un diagráma esquemático de uno de dichos grupos de impresión según un segundo ejemplo de realización, en el que la tinta es aportado mediante un rodillo de transferencia que esta bañado en una cubeta de tinta. Fig. 6 is a schematic diagram of one of said printing groups according to a second embodiment, in which the ink is supplied by a transfer roller which is bathed in an ink tray.
La Fig.7 es un diagrama esquemático de uno de dichos grupos de impresión según un segundo ejemplo de realización, con la variante de tener unos rodillos intermedios de transferencia de tinta. Fig. 7 is a schematic diagram of one of said printing groups according to a second embodiment, with the variant having intermediate ink transfer rollers.
La Fig.8 es un diagrama esquemático de una maquina flexográfica con dos grupos de impresión y con una pantalla de soplado de aire para colaborar a enfriar la temperatura de la tinta ya aplicada sobre el sustrato y mantenerla a dicho segundo intervalo de temperatura Tgei en la que la tinta esta en un estado gel apropiado para recibir una posterior aplicación de tinta del subsiguiente grupo impresor. Fig. 8 is a schematic diagram of a flexographic machine with two printing groups and with an air blow screen to help cool the temperature of the ink already applied on the substrate and keep it at said second temperature range T ge i wherein the ink is in an appropriate gel state to receive a subsequent application of ink from the subsequent printing group.
Descripción detallada de unos ejemplos de realización
Haciendo en primer lugar referencia a la Fig. 1 se describe una posible realización de un dispositivo de impresión usando dichas tintas susceptibles de cambiar de fase en función de la temperatura para impresora flexográfica según la presente invención. La mencionada máquina impresora flexográfica comprende en general uno o más grupos de impresión 21 (sólo dos de los cuales se muestran en la Fig. 1 ) adaptados para imprimir dichas tintas de impresión sobre una banda de sustrato 23 apoyada en al menos un rodillo de contrapresión 24. Alternativamente, la impresora flexográfica podría tener un único grupo de impresión 21 y un único rodillo de contrapresión 24 o varios grupos de impresión 21 cada uno asociado a un correspondiente rodillo de contrapresión 24. Detailed description of some embodiments Referring firstly to Fig. 1, a possible embodiment of a printing device using said inks capable of changing phase depending on the temperature for flexographic printer according to the present invention is described. Said flexographic printing machine generally comprises one or more printing groups 21 (only two of which are shown in Fig. 1) adapted to print said printing inks on a substrate band 23 supported on at least one backpressure roller. 24. Alternatively, the flexographic printer could have a single print group 21 and a single back pressure roller 24 or several print groups 21 each associated with a corresponding back pressure roller 24.
Las tintas de impresión susceptibles de cambio de fase en función de la temperatura, tienen un primer rango de temperaturas T|iq en el que están en una fase líquida y un segundo rango de temperaturas Tgei en el que están en una fase gel, siendo dicho rango de temperaturas Tgei menor que el rango de temperaturas T|iq. Dichas tintas son apropiadas para un método de impresión húmedo sobre húmedo según el cual, cuando la impresora flexográfica tiene varios grupos de impresión 21 , éstos imprimen las tintas (que están a una temperatura T|¡q) sucesivamente unas sobre otras sobre la banda de sustrato 23 debidamente soportada. Al entrar en contacto dichas tintas (a una temperatura T|iq) con la superficie del material que está a una temperatura inferior (Tgei) se produce un cambio de estado en la tinta volviéndose esta gel, de manera que la siguiente tinta puede ser aplicada encima. Una vez aplicadas todas las tintas, y dado que estas tintas són curables por radiación UV o EB, se procede al curado conjunto de las mismas al final del proceso de impresión mediante una unidad de emisión de energía (no mostrada) dispuesta para dirigir energía hacia dichas tintas de impresión impresas sobre la banda de sustrato 23. Printing inks susceptible to phase change depending on the temperature have a first temperature range T | iq in which they are in a liquid phase and a second temperature range T ge i in which they are in a gel phase, said temperature range T ge i being less than the temperature range T | iq . Said inks are suitable for a wet to wet printing method according to which, when the flexographic printer has several printing groups 21, they print the inks (which are at a temperature T | q ) successively one above the other on the web of substrate 23 duly supported. When said inks come into contact (at a temperature T | iq ) with the surface of the material that is at a lower temperature (T ge i) a change in state in the ink is produced by turning this gel, so that the next ink can be applied on Once all the inks have been applied, and since these inks are curable by UV or EB radiation, they are cured at the end of the printing process by means of an energy emission unit (not shown) arranged to direct energy towards said printing inks printed on the substrate web 23.
Cada grupo de impresión 21 comprende (Fig. 2) una cámara de aplicación de tinta 13 adaptada para aplicar la tinta de impresión a una superficie alveolada de un rodillo entintador 1 1 dispuesto para entintar a su vez un rodillo impresor 12 (portador de un cliché de impresión) que gira en contacto con la banda de sustrato 23 que se mueve apoyada sobre el rodillo de contrapresión 24. La impresora flexográfica incluye unos medios de suministro de tinta que comprenden un depósito de tinta 1 , una línea de suministro de tinta 6 conectada a una entrada de la correspondiente cámara de aplicación de tinta 13 y una línea de retorno de tinta 7 desde una salida de la cámara de aplicación de tinta 13 al depósito de tinta 1 . Una bomba 8 está dispuesta en dicha línea de suministro de tinta 6 para impeler la tinta a lo largo del circuito de suministro y
retorno, y una segunda bomba 9 puede también estar dispuesta en el circuito de retorno para extraer la tinta de la cámara de rasqueta y devolverla al depósito. Each printing group 21 comprises (Fig. 2) an ink application chamber 13 adapted to apply the printing ink to a honeycomb surface of an inking roller 1 1 arranged to in turn inking a printing roller 12 (holder of a cliché printing) which rotates in contact with the substrate band 23 that moves supported on the counterpressure roller 24. The flexographic printer includes ink supply means comprising an ink reservoir 1, an ink supply line 6 connected to an input of the corresponding ink application chamber 13 and an ink return line 7 from an output of the ink application chamber 13 to the ink reservoir 1. A pump 8 is arranged in said ink supply line 6 to impel the ink along the supply circuit and return, and a second pump 9 may also be arranged in the return circuit to extract the ink from the scraper chamber and return it to the reservoir.
El dispositivo de la presente invención comprende, para cada grupo de impresión 21 , unos medios para mantener sustancialmente constante la temperatura de la citada tinta de impresión dentro de un rango de temperaturas TNq en el que la tinta está en estado líquido y puede por lo tanto ser transferida fácilmente de uno a otro de los elementos (13, 11 , 12). En las figuras 2-3-4 y 5 podemos ver los diferentes esquemas de los elementos de regulación y mantenimiento de la temperatura según la explicación precedente. The device of the present invention comprises, for each printing group 21, means for keeping the temperature of said printing ink substantially constant within a range of temperatures T Nq in which the ink is in a liquid state and can therefore both be easily transferred from one of the elements to the other (13, 11, 12). In Figures 2-3-4 and 5 we can see the different schemes of the elements of regulation and maintenance of the temperature according to the preceding explanation.
En la Fig. 6 se muestra una realización alternativa del dispositivo de la presente invención que es en todo análoga a la realización descrita más arriba en relación con las figuras anteriores, excepto en que, aquí, la aportación de la tinta al rodillo entintador o anilox no se realiza mediante una cámara de rasqueta 13 con sus sistemas de alimentación de tinta, sino que se realiza mediante un rodillo entintador 30 que bañado en una cubeta llena de tinta 31 va aportando la tinta al rodillo anilox 11. En esta figura 6 podemos además ver que tanto dicho rodillo de aportación de tinta 30 como la cubeta con la tinta 31 son mantenidos a una temperatura en el intervalo T|iq en el que la tinta esta en estado líquido y apta para ser transferida An alternative embodiment of the device of the present invention is shown in Fig. 6 which is analogous to the embodiment described above in relation to the previous figures, except that, here, the contribution of the ink to the inking roller or anilox it is not carried out by means of a scraper chamber 13 with its ink feeding systems, but it is carried out by means of an inking roller 30 which, bathed in a bucket full of ink 31, supplies the ink to the anilox roller 11. In this figure 6 we can see that said ink supply roller 30 and the ink tray 31 are maintained at a temperature in the interval T | iq in which the ink is in a liquid state and capable of being transferred
En la Fig. 7 se muestra otra realización alternativa del dispositivo de la presente invención, según la realización de la figura 6 en la que entre el rodillo entintador 30 y el rodillo anilox 11 se intercalan varios rodillos 32 y 33 que mediante diferentes velocidades de giro van laminando la capa de tinta para dejar sobre el rodillo anilox 11 la capa con el grosor necesario para la impresión. Evidentemente y tal como se muestra en la figura7 dichos rodillos intermedios 32 y 33 deben contar también con sus propios sistemas de regulación de temperatura para mantener en todo momento la tinta dentro del intervalo T|iq que permite su transferencia. In Fig. 7 another alternative embodiment of the device of the present invention is shown, according to the embodiment of Figure 6 in which between the inking roller 30 and the anilox roller 11 several rollers 32 and 33 are interleaved which by different speeds of rotation They are laminating the ink layer to leave the layer with the thickness necessary for printing on the anilox roller 11. Obviously and as shown in Figure 7, said intermediate rollers 32 and 33 must also have their own temperature regulation systems to keep the ink at all times within the interval T | iq that allows its transfer.
Finalmente, en la figura 8 podemos ver una realización alternativa en la que entre dos grupos impresores se intercala una unidad de soplado de aire frió 34 para mejorar la velocidad en que la tinta pasa de un primer intervalo de temperatura T|iq en el que la tinta es transferida a un segundo intervalo de temperatura Tgei en que la tinta ha efectuado ya su cambio de estado a gel. Este dispositivo es especialmente indicado en el caso de altas velocidades de impresión, en el que aun estando la superficie del tambor y del sustrato dentro del intervalo de temperatura Tgei, el poco tiempo transcurrido entre una estación impresora y la siguiente hacen que por transferencia de
térmica no se consiga que la tinta llegue al intervalo de temperatura Tgei necesario para pasar al estado gel y así poder aplicar la siguiente tinta. Con el soplado de aire frío se consigue cambio de temperatura (y portanto de estado) mucho más rápido.
Finally, in Figure 8 we can see an alternative embodiment in which between two printing groups a cold air blowing unit 34 is inserted to improve the speed in which the ink passes from a first temperature range T | iq in which the ink is transferred to a second temperature range T ge i in which the ink has already made its state change to gel. This device is especially indicated in the case of high printing speeds, in which even if the surface of the drum and the substrate is within the temperature range T ge i, the short time elapsed between one printing station and the next causes that by transfer from thermal is not achieved that the ink reaches the temperature range T ge i necessary to move to the gel state and thus be able to apply the following ink. With the blowing of cold air, a change in temperature (and a good condition) is achieved much faster.
Claims
1.- Máquina flexográfica de tambor central para aplicación de tintas susceptibles de experimentar un cambio de fase entre líquido y gel, comprendiendo unos medios de calentamiento para calentar dicha tinta y al menos dos grupos de impresión, cada uno con un rodillo entintador y un rodillo porta-clichés, para aplicar la tinta sobre un sustrato (23) soportado en dicho tambor central (24), caracterizada porque tanto dicho rodillo entintador (1 1 ) como dicho rodillo porta-clichés (12) incluyen unos primeros medios de control de temperatura para controlar la temperatura de al menos una superficie de los mismos a un valor comprendido dentro de un primer rango de valores de temperatura predeterminado para asegurar que la tinta en contacto con dicha superficie esté en una fase líquida, y porque dicho tambor central (24) incluye unos segundos medios de control de temperatura para controlar la temperatura de al menos una superficie del tambor (24) a un valor dentro de un segundo rango de valores de temperatura predeterminado para asegurar que la tinta una vez aplicada sobre dicho sustrato (23), soportado en dicha superficie del tambor central, experimente y conserve un cambio de fase a gel. 1.- Central drum flexographic machine for application of inks capable of experiencing a phase change between liquid and gel, comprising heating means for heating said ink and at least two printing groups, each with an inking roller and a roller clichés holder, to apply the ink on a substrate (23) supported on said central drum (24), characterized in that both said inking roller (1 1) and said clichés roller (12) include first temperature control means to control the temperature of at least one surface thereof at a value within a first range of predetermined temperature values to ensure that the ink in contact with said surface is in a liquid phase, and because said central drum (24) includes a second temperature control means for controlling the temperature of at least one surface of the drum (24) at a value within a second range of predetermined temperature values to ensure that the ink once applied on said substrate (23), supported on said surface of the central drum, undergoes and conserves a phase change to gel.
2 - Máquina según la reivindicación 1 , caracterizada porque cada uno de dichos grupos de impresión comprende un dispositivo de rasqueta para aplicar la tinta al rodillo entintador (11), y porque dicho dispositivo de rasqueta comprende una cámara de tinta y unos terceros medios de control de temperatura para regular la temperatura de la tinta en el interior de dicha cámara de tinta a un valor dentro de dicho primer rango de valores de temperatura predeterminado. 2 - Machine according to claim 1, characterized in that each of said printing groups comprises a scraper device for applying the ink to the inking roller (11), and because said scraper device comprises an ink chamber and third control means of temperature to regulate the temperature of the ink inside said ink chamber to a value within said first range of predetermined temperature values.
3.- Máquina según la reivindicación 2, caracterizada porque la cámara de tinta 3. Machine according to claim 2, characterized in that the ink chamber
(13) de cada dispositivo de rasqueta recibe la tinta en estado líquido desde un depósito de tinta (1) provisto de unos cuartos medios de control de temperatura para controlar la temperatura de la tinta en el interior de dicho depósito (1) a un valor dentro de dicho primer rango de valores de temperatura predeterminado. (13) of each scraper device receives the ink in liquid state from an ink tank (1) provided with a quarter temperature control means to control the temperature of the ink inside said tank (1) at a value within said first range of predetermined temperature values.
4. - Máquina según la reivindicación 3, caracterizada porque dicho depósito de tinta (1) está conectado a dicha cámara de tinta (13) por unos medios de circulación de tinta compuestos por varios elementos, y uno o más de dichos elementos están aislados térmicamente o están provistos de unos quintos medios de control de temperatura para controlar la temperatura de la tinta en el interior de dichos elementos a un valor dentro de dicho primer rango de valores de temperatura predeterminado. 4. - Machine according to claim 3, characterized in that said ink tank (1) is connected to said ink chamber (13) by means of ink circulation composed of several elements, and one or more of said elements are thermally insulated or they are provided with fifth fifth temperature control means to control the temperature of the ink inside said elements at a value within said first predetermined temperature value range.
5. - Máquina según la reivindicación 1 , caracterizada porque cada uno de dichos grupos de impresión comprende una cubeta de tinta (31 )y al menos un rodillo (30) de transferencia de tinta en contacto con la tinta en el interior de dicha cubeta de tinta para aplicar la tinta al rodillo entintador, y porque dicha cubeta de tinta (31) comprende unos sextos medios de control de temperatura para controlar la temperatura de la tinta en el interior de la cubeta de tinta a un valor dentro de dicho primer rango de valores de temperatura predeterminado. 5. - Machine according to claim 1, characterized in that each of said printing groups comprises an ink tray (31) and at least one roller (30) of transfer of ink in contact with the ink inside said ink bucket to apply the ink to the inking roller, and because said ink bucket (31) comprises sixth temperature control means to control the temperature of the ink in the ink inside the ink tray at a value within said first range of predetermined temperature values.
6. - Máquina según la reivindicación 5, caracterizada porque dicho rodillo de transferencia de tinta (30) comprende unos séptimos medios de control de temperatura para controlar la temperatura de una superficie del mismo a un valor dentro de dicho primer rango de valores de temperatura predeterminado. 6. - Machine according to claim 5, characterized in that said ink transfer roller (30) comprises seventh temperature control means for controlling the temperature of a surface thereof at a value within said first range of predetermined temperature values .
7. - Máquina según la reivindicación 6, caracterizada porque cada uno de los grupos de impresión comprende uno o más rodillos de transferencia de tinta intermedios (32, 33) para transferir por laminación la tinta desde el rodillo de transferencia de tinta al rodillo entintador, y al menos uno de dichos rodillos de transferencia de tinta intermedios (32, 33) comprende unos octavos medios de control de temperatura para controlar la temperatura de una superficie del mismo a un valor dentro de dicho primer rango de valores de temperatura predeterminado. 7. - Machine according to claim 6, characterized in that each of the printing groups comprises one or more intermediate ink transfer rollers (32, 33) for transferring by lamination the ink from the ink transfer roller to the inking roller, and at least one of said intermediate ink transfer rollers (32, 33) comprises eighth temperature control means for controlling the temperature of a surface thereof at a value within said first range of predetermined temperature values.
8. - Máquina según una cualquiera de las reivindicaciones precedentes, caracterizada porque corriente abajo de cada grupo de impresión está dispuesto un dispositivo de soplado de aire (34) para aplicar un chorro de aire frío o aire a temperatura ambiente sobre la tinta recién aplicada al sustrato por el grupo de impresión precedente, para cooperar en dicha transición de la tinta a estado gel. 8. - Machine according to any one of the preceding claims, characterized in that an air blowing device (34) is arranged downstream of each printing group to apply a jet of cold air or air at room temperature on the ink just applied to the substrate by the preceding printing group, to cooperate in said transition of the ink to gel state.
9. - Máquina según una cualquiera de las reivindicaciones precedentes, caracterizada porque dichos primeros, terceros, cuartos, quintos, sextos, séptimos y octavos medios de control de temperatura comprenden un dispositivo de calentamiento y un equipo automático de regulación para regular el funcionamiento de dicho dispositivo de calentamiento en los citados rangos de valores. 9. - Machine according to any one of the preceding claims, characterized in that said first, third, fourth, fifth, sixth, seventh and eighth temperature control means comprise a heating device and an automatic regulation equipment to regulate the operation of said heating device in the mentioned ranges of values.
10. - Máquina según una cualquiera de las reivindicaciones precedentes, caracterizada porque dichos segundos medios de control de temperatura comprenden un dispositivo de enfriamiento y un equipo automático de regulación para regular el funcionamiento de dicho dispositivo de enfriamiento. 10. - Machine according to any one of the preceding claims, characterized in that said second temperature control means comprise a cooling device and an automatic regulation equipment for regulating the operation of said cooling device.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES201000873A ES2372201B1 (en) | 2010-06-30 | 2010-06-30 | CENTRAL DRUM FLEXOGRAPHIC MACHINE FOR APPLICATION OF SUSCEPTIBLE INKS TO EXPERIENCE A PHASE CHANGE BETWEEN LIQUID AND GEL. |
| ESP201000873 | 2010-06-30 | ||
| ES201001112A ES2377618B1 (en) | 2010-08-30 | 2010-08-30 | CENTRAL DRUM FLEXOGRAPHIC MACHINE FOR APPLICATION OF SUSCEPTIBLE INKS TO EXPERIENCE A PHASE CHANGE BETWEEN LIQUID AND GEL. |
| ESP201001112 | 2010-08-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2012001186A1 true WO2012001186A1 (en) | 2012-01-05 |
| WO2012001186A4 WO2012001186A4 (en) | 2012-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES2011/000216 WO2012001186A1 (en) | 2010-06-30 | 2011-06-30 | Central-drum flexographic machine for the application of inks capable of undergoing a liquid/gel phase change |
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| Country | Link |
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| WO (1) | WO2012001186A1 (en) |
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| WO2012001186A4 (en) | 2012-03-15 |
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