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(11) | EP 0 086 282 B2 |
| (12) | NEW EUROPEAN PATENT SPECIFICATION |
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Card, formed by laminating a plurality of plastic films, carrying a print within the laminate, and method for forming said card Durch Laminieren von mehreren Kunststoffilmen hergestellte Karte die im Laminat einen Druck enthält und Verfahren zu ihrer Herstellung Carte, fabriquée par laminage de plusieurs films en matière plastique, portant une impression au sein du laminé, et son procédé de fabrication |
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[0001] The invention relates to an identity card formed as a laminate of at least three plastic films and carrying an image in a printing technique, said image comprising a line pattern as is usual for securities, said pattern being distributed over at least two film faces within the laminate and wherein the plastic material of the films is polyvinylchloride.
[0002] Furthermore the invention relates to a method for laminating an identity card of transparent polyvinylchloride film while enclosing an ink printed image within the laminate comprising the steps of stacking the films to be laminated while enclosing the said image and laminating same by application of pressure onto their full surface areas and of heat.
[0003] A similar identity card and a similar method for forming an identity card are disclosed in FR-A-2 279 548. The enclosed printed image being distributed among at least two faces of the films forming the laminate is inaccessible for tampering with said print other than by taking the laminate apart. Provided that the adherence between the films is good, separation of the laminate will cause serious and unrepairable damage of the films and of the printed image in particular. Repair of the card after separating the laminate without any visible damage is virtually impossible. Thus the card is protected against falsification in the above sense. Good adherence of the films as required having this object in mind is prejudiced by the printed image that locally bars direct contact between the films.
[0004] FR-A-1 032 615 discloses a method for enveloping any document comprising the steps of arranging said document between two transparent polyvinyl films, and of compressing the said arrangement while successively applying heat to and cooling the array. However, the enclosing films are larger than the document such that said films envelop the document in a secure border where the covering films are in direct contact.
[0005] DE-A-2 225 471 discloses an identity card formed as a laminate of three polyvinylchloride films, viz. a core ply and two transparent cover films. According to this disclosure (example 10) the laminating process - at a temperature of 150°C and a pressure of 20 kg/cm2 (2 MPa) - will cause embedding of an imprint on the core ply into the adjacent films, thus requiring actual fusion of the films. Any imprint on any of the films before laminating the same will slightly run out and will lose their definition. This disclosure in a general sense mentions a pressure range of lamination from 1 to 50 kg/cm2. However, the examples given do not support this allegation.
[0006] US-A-3 457 661 discloses a laminated identity card comprising a plurality of plasticfilms and photoprint, using a vinyl-base ink of the heat- resistant type which makes a permanent bond with the print carrier film for printing indicia on both sides of an opaque film to be enclosed when laminating at a temperature in the range from 225 to 250°F (107 to 121°C) and a pressure in the range from 200 to 300 psi (1.4 to 2.1 MPa).
[0007] According to the invention good adherence of the films in the above identity card is attained in that said image is printed using an adhesive thermosetting vinyl ink, a so-called HSV ink, for bonding of the adjacent or superposed film with the aid of the ink, and in that the ratio of printed to unprinted surface area amounting to at most 50% of an interface between two films, the image being printed "bled-off".
[0008] The method for forming the same identity card is characterized in that the step of imprinting the image comprises use of an adhesive thermosetting vinyl ink, a so-called HSV-ink, for bonding of the adjacent or superposed film with the aid of the ink.
Example
[0010] A card was manufactured by laminating four polyvinylchloride films with a format of 350 x 480 mm as follows.
[0011] Two of the films with a thickness of 0.2 mm were unilaterally offset printed image-wise with an HSV-ink.
[0012] As cover films a transparent film having a thickness of 0.1 mm and a transparent film having a thickness of 0.3 mm were used. The films were compiled to form a package and four of such packages were placed between two chromium nickel polishing plates in a laminating press and heated therein up to 150°C, while applying a force of 10 kN. During cooling the force was raised to 0.6 MN. After heating the process took less than 9 minutes.
1. An identity card formed as a laminate of at least three plastic films and carrying
an image in a printing technique, said image comprising a line pattern as is usual
for securities, said pattern being distributed over at least two film faces within
the laminate and wherein the plastic material of the films is polyvinylchloride, characterized
in that said image is printed using an adhesive thermosetting vinyl ink, a so-called
HSV ink, for bonding of the adjacent or superposed film with the aid of the ink, the
ratio of printed or unprinted surface area in an interface between two films amounting
to at most 50%, the said image being printed 'bled-off'.
2. A method for laminating an identity card of transparent polyvinylchloride films
while enclosing an ink printed image within the laminate comprising the steps of stacking
the films to be laminated while enclosing the said image and laminating same by application
of pressure onto their full surface areas and of heat, characterized in that said
laminating step comprises the steps of compressing the stack, subsequently heating
same while maintaining said pressure and finally cooling the film while maintaining
said pressure and in that said step of imprinting the image comprises use of an adhesive
thermosetting vinyl ink, a so-called HSV ink, for bonding of the adjacent or superposed
film with the aid of the ink.
1. Eine Identitätskarte hergestellt, durch die Laminierung von wenigstens drei Kunststoffilmen,
die ein Bild in Druck trägt, wobei das Bild ein Strichbild, wie üblich für Wertpapiere,
enthält, wobei das Strichbild über wenigstens zwei Filmflächen in dem Laminat verteilt
ist, und das Kunststoffmaterial der Filme Polyvinylchlorid ist, dadurch gekennzeichnet,
dass das Bild gedruckt ist unter Verwendung eine haftenden warmabbindenden Vinylfarbe,
einer sogenannten HSV-Farbe, zur Verklebung des nächsten oder überlagernden Films
mit Hilfe der Farbe, wobei das Verhältnis zwischen dem bedruckten und dem unbedruckten
Flächeninhalt in einer Grenzfläche zwischen zwei Filmen sich auf höchstens 50% beläuft,
und das Bild am Rand abfallend gedruckt ist.
2. Verfahren zur Laminierung einer Identitätskarte aus transparenten Polyvinylchlorid-Filmen
mit der gleichzeitigen Einschliessung eines in Farbe gedruckten Bildes in dem Laminat,
mit dem Schritt zur Staplung der zu laminierenden Filme mit der Einschliessung des
Bildes und dem Schritt zur Laminierung derselben unter Anwendung von Druck auf ihren
völligen Flächeninhalt und von Wärme, dadurch gekennzeichnet, dass der Laminierungsschritt
das Zusammendrücken des Stapels, derauffolgend das Erwärmen desselben unter Aufrechterhaltung
des Drucks und schliesslich das Abkühlen des Films unter Aufrechterhaltung dieses
Drucks enthält und dass Drucken des Bildes die Verwendung einer haftenden warmabbindenden
Vinylfarbe, einer sogenannten HSV-Farbe, zur Verklebung des nächsten oder überlagernden
Films mit Hilfe der Farbe enthält.
1. Carte d'identité ayant la forme d'un stratifié constitué d'au moins trois pellicules
de matière plastique et portant une image obtenue par une technique d'impression,
ladite image comprenant une trame de ligne comme il est courant pour les titres, ladite
trame étant répartie sur au moins deux faces des pellicules à l'intérieur du stratifié,
et dans lequel la matière plastique des pellicules est du chlorure de polyvinyle,
caractérisée en ce que ladite image est imprimée par utilisation d'une encre vinylique
adhésive thermodurcissable, dénommée encre HSV, afin de lier la pellicule contiguë
ou superposée à l'aide de l'encre, le rapport de la surface imprimée à la surface
non imprimée à une interface entre deux pellicules s'élevant au plus à 50%, ladite
image étant imprimée à fond perdu.
2. Procédé pour stratifier une carte d'identité en pellicules transparentes de chlorure
de polyvinyle, tout en enfermant une image imprimée à l'encre à l'interieur du stratifié,
comprenant les étapes consistant à empiler les pellicules à stratifier tout en enfermant
ladite image et à stratifier l'ensemble par application de pression sur la totalité
de leurs surfaces et de chaleur, caractérisé en ce que ladite étape de stratification
comprend les étapes consistant à comprimer l'empilement, à chauffer ensuite celui-ci
tout en maintenant ladite pression et enfin à refroidir la pellicule tout en maintenant
ladite pression, et en ce que l'étape d'impression de l'image comprend l'utilisation
d'une encre vinylique adhésive thermodurcissable, dénomée encre HSV, pour lier la
pellicule contiguë ou superposée à l'aide de l'encre.