ES2327662T5 - Procedimiento de obtención de imágenes por láser - Google Patents

Procedimiento de obtención de imágenes por láser Download PDF

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Publication number
ES2327662T5
ES2327662T5 ES06000946T ES06000946T ES2327662T5 ES 2327662 T5 ES2327662 T5 ES 2327662T5 ES 06000946 T ES06000946 T ES 06000946T ES 06000946 T ES06000946 T ES 06000946T ES 2327662 T5 ES2327662 T5 ES 2327662T5
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substrate
laser
pigment
black
aom
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ES2327662T7 (es
ES2327662T3 (es
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Nazir Khan
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DataLase Ltd
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DataLase Ltd
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Priority claimed from GBGB0106603.4A external-priority patent/GB0106603D0/en
Priority claimed from GB0108360A external-priority patent/GB0108360D0/en
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
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    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
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    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
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    • C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
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    • C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
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    • C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
    • C09D101/08—Cellulose derivatives
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    • C09D11/00—Inks
    • C09D11/02—Printing inks
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    • C09D11/00—Inks
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    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
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    • C09D127/04—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
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    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
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    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
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Abstract

Procedimiento para proporcionar una imagen sobre un sustrato, que comprende aplicar, a una zona relativamente pequeña del sustrato, una formulación que comprende un pigmento y uno o más de otros componentes que forman una imagen por irradiación con luz láser, e irradiar la zona, en el que la imagen presenta mayor contraste con respecto al pigmento que con respecto al sustrato.

Description

Procedimiento de obtención de imágenes por láser.
Campo de la invención
La presente invención se refiere a procedimientos para proporcionar un código de barras en negro sobre un sustrato.
Antecedentes de la invención
Se han realizado varias propuestas con el fin de lograr la impresión eficaz sobre un sustrato, provocando un cambio de color en el sustrato sobre el que va a aparecer la impresión. Se han propuesto varios pigmentos que pueden utilizarse para marcar un sustrato con la aplicación de energía láser. Algunas de estas propuestas pueden encontrarse, por ejemplo, en los documentos WO-A-00/43456, JP-A-11001065, EP-A-0 522 370, EP-A-0 797 511, US-A-5.053.440, US-A-5.350.792 (A plastics moulding composition comprising a polyoxymethylene and animal charcoal), US-A-5.928.780, US-A-6.017.972 y US-A-6.019.831. Los documentos US-A-5.489.639 y US-A-5.884.079 dan a conocer que el hidroxifosfato de cobre es un material que puede marcarse con láser.
El octamolibdato de amonio, que presenta la fórmula (NH4)4Mo8O26 y se abrevia en la presente memoria AOM, es un material fácilmente disponible que presenta propiedades retardadores de la llama. Para este fin, se ha formulado con polímeros tales como poli(cloruro de vinilo) (PVC). Por ejemplo, los cables que contienen PVC pueden contener AOM como agente supresor de humo. El AOM es un ejemplo de un oxianión de un metal multivalente; existen muchos compuestos de este tipo en estados coloreados de valencia inferior o no estequiométricos.
La impresión sobre embalajes tales como de cartón es de importancia comercial considerable. Puede ser simplemente para proporcionar información visible a una persona que maneja los embalajes, pero también se requiere para el código de barras y otros marcajes que se pretende que lea una máquina. Esto supone dos problemas particulares.
En primer lugar, el material de embalaje más económico tiende a ser marrón o de algún otro color indeterminado, frente a lo cual el código de barras, digamos en negro, presenta un contraste bajo (normalmente de grado C o D). En segundo lugar, debido a la necesidad de personalizar el embalaje, se produce un desperdicio implicado en la información de impresión sobre el embalaje que tiene que adaptarse para cada cliente particular.
El documento EP 0 447 032 da a conocer una composición de pigmento blanco que puede marcarse con láser que incluye un primer pigmento que puede marcarse mediante láser ultravioleta y un segundo pigmento que no absorbe en la región ultravioleta, de modo que el segundo pigmento presenta un efecto blanqueante sobre la composición. El documento JP 63209889 da a conocer la aplicación de una tinta de color predeterminado a la superficie de una resina termoendurecible moldeada mediante calor y presión y la realización de marcaje con láser sobre la superficie recubierta.
Sumario de la invención
Según la presente invención, un procedimiento para proporcionar un código de barras en negro sobre un sustrato comprende aplicar, a una zona relativamente pequeña del sustrato, una formulación que comprende un pigmento blanco y uno o más otros componentes que forman una imagen negra por irradiación con luz láser, e irradiar la zona, en el que la imagen presenta mayor contraste con respecto al pigmento que con respecto al sustrato.
Este procedimiento permite que se logre un alto contraste (normalmente de grado A o B) entre la imagen y su fondo inmediato. Además, el hecho de que la imagen pueda proporcionarse según demanda y que no dependa del suministro de sustrato, significa que puede evitarse el desperdicio inherente en la personalización; esto puede conducir a ahorros sustanciales en el coste, para el embalaje producido en gran volumen.
Descripción de las formas de realización preferidas
El componente de la formulación que forma una imagen por irradiación con luz láser puede ser un compuesto que contiene un oxianión. El catión puede ser amonio o un metal alcalino o alcalinotérreo, pero esto no es crítico. El oxianión puede ser un molibdato, tungstato o compuesto de metal de transición análogo. Dichos componentes incluyen di y heptamolibdatos. El componente es preferiblemente AOM; la siguiente descripción se refiere a AOM únicamente para fines de ilustración. Actualmente, se prefiere AOM porque está fácilmente disponible y es selectivo para un láser de CO2 de baja potencia, robusto, funcionando a aproximadamente 10.600 nm.
El AOM puede incorporarse en diversos sistemas de polímero y molerse, utilizando un molino de bolas, hasta un tamaño de partícula deseado, sin ninguna dificultad técnica. Ejemplos de sistemas de polímero en los que se ha incorporado y se ha molido satisfactoriamente AOM incluyen disolución de nitrocelulosa en alcohol/acetato de etilo, disolución de propionato -acetato de celulosa en alcohol/acetato de etilo, disolución de polivinilbutiral en
alcohol/acetato de etilo, resina de poliuretano a base de disolvente, resina epóxido a base de disolvente, resina de poliéster a base de disolvente, resina acrílica a base de agua, resina de poliéster a base de agua, resina de poliuretano a base de agua, monómeros y oligómeros curables con luz ultravioleta sin disolvente, poliamidas a base de disolvente, poliimidas a base de disolvente, poliamidas a base de agua, poliimidas a base de agua, recubrimientos y lacas de epóxido/vinilo/poliéster a base de disolvente y resinas de siloxano.
Pueden incorporarse pigmentos orgánicos e inorgánicos en tintes/recubrimientos de AOM sin ningún efecto adverso en la capacidad de marcaje con láser de las tintas/recubrimientos de AOM. Además, las tintas/recubrimientos de AOM que contienen los pigmentos orgánicos e inorgánicos pueden molerse hasta un tamaño de partícula deseado sin dificultad o efecto adverso sobre la capacidad de marcaje con láser de las tintas/recubrimientos de AOM.
El AOM o análogo del mismo debe ser selectivo para láser, lo que significa que absorbe energía a una longitud de onda, por ejemplo, de �1.064 nm o �10.600 nm, para lo que puede escogerse un láser en consecuencia, de manera que experimente un cambio de color. El cambio de color normalmente será el resultado de un cambio en el estado de valencia y/o en la formación de productos no estequiométricos, aunque también puede haber alguna reacción con el aglutinante. El láser que se utiliza puede funcionar o bien en el modo de matriz de puntos o bien en el modo de trazado, de onda continua.
El sustrato puede ser cartulina, por ejemplo, cartón. El embalaje que puede utilizarse en la invención puede estar alternativamente en la forma de una película polimérica, tal como polipropileno o polietileno, y que puede laminarse y utilizarse, por ejemplo, para envolver chocolate. Si se utiliza un material de embalaje de múltiples capas, la invención puede aplicarse a cualquier capa en la que la tinta esté presente.
El pigmento que se utilice en la invención puede ser convencional. El pigmento blanco puede proporcionar no únicamente contraste con un código de barras en negro, sino también opacidad. Los pigmentos típicos incluyen CaCO3, ZnO, TiO2 y talco.
Una formulación de la invención también puede incluir componentes convencionales que están presentes con el fin de proporcionar la imagen. Normalmente, incluyen un material que absorbe luz láser incidente; este material puede cambiar de color por sí mismo con la absorción o puede reaccionar con otro material para proporcionar un cambio de color. Reactivos típicos incluyen fenoles, resinas fenólicas, ácidos carboxílicos junto con un formador de color, por ejemplo, cristal violeta lactona. Agentes de absorción típicos incluyen arcillas, micas, TiO2, carbonatos, óxidos, talco, silicatos y aluminosilicatos.
Con el fin de que la invención pueda entenderse más fácilmente se hace referencia al ejemplo siguiente, que se proporciona a título ilustrativo de la invención, pero no limitativo del alcance.
Ejemplo
Se formuló una tinta blanca opaca tal como sigue:
Resina fenólica 17% Formador de color 6% Aglutinante 7% TiO2 6% Mica 2% Agua Resto
Ésta se imprimió mediante flexografía para producir un panel en papel manila ondulado. Se expuso el panel blanco resultante al haz a partir de un láser de CO2 de trazado para producir un código de barras unidimensional. El código de barras era de buena calidad, con verificación de clase A/B cuando se utilizó el formador de color negro Pergascript black I-R o Pergascript black I-2R (Ciba Speciality Chemicals).

Claims (5)

  1. REIVINDICACIONES
    1. Procedimiento para proporcionar un código de barras en negro sobre un sustrato, que comprende aplicar, a una
    5 zona relativamente pequeña del sustrato, una formulación que comprende un pigmento blanco y uno o más otros componentes que forman una imagen negra por irradiación con luz láser, e irradiar la zona, en el que el código de barras en negro presenta mayor contraste con respecto al pigmento que con respecto al sustrato.
  2. 2.
    Procedimiento según la reivindicación 1, en el que la formulación incluye un componente que absorbe luz láser, 10 por ejemplo, a 10.600 nm.
  3. 3. Procedimiento según la reivindicación 1 o 2, en el que el sustrato es una película polimérica.
  4. 4.
    Procedimiento según cualquiera de las reivindicaciones 1 a 3, en el que el sustrato es metal, por ejemplo, lámina 15 de aluminio.
  5. 5. Procedimiento según cualquiera de las reivindicaciones 1 a 4, en el que el sustrato es papel o cartón.
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EP1657072A2 (en) 2006-05-17
DE60216898T3 (de) 2012-04-26
PT1368200E (pt) 2007-02-28
EP1368200B1 (en) 2006-12-20
DK1368200T4 (da) 2011-10-10
EP1657072A3 (en) 2006-07-26
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EP1368200A2 (en) 2003-12-10
EP1657072B3 (en) 2016-08-31
DE60216898T2 (de) 2007-07-26
DE60216898D1 (de) 2007-02-01
WO2002074548A3 (en) 2003-03-13
JP3913680B2 (ja) 2007-05-09
US7485403B2 (en) 2009-02-03
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JP2004522631A (ja) 2004-07-29
US8753791B2 (en) 2014-06-17
ATE348712T1 (de) 2007-01-15
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WO2002074548A2 (en) 2002-09-26
US20030180660A1 (en) 2003-09-25
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