Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1997-03-17
1998-10-27
Yamnitzky, Marie
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428337, 4284111, 428480, 428500, 428913, 428914, 428915, B32B 310
Patent
active
058276033
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a transfer foil comprising a carrier film and at least one colour layer which is detachable from the carrier film in a region-wise manner by means of heat and/or pressure and which is transferable on to a substrate.
DESCRIPTION OF THE PRIOR ART
So-called hot stamping foils are used to a very great extent for the decoration of substrate surfaces. Such foils include a carrier film on which there is provided a decorative layer arrangement which, by means of heat and/or pressure, is detachable from the carrier film and can be transferred on to the substrate. The decorative layer arrangement of the hot stamping foils usually comprises a plurality of comparatively stable lacquer layers and is fixed to the substrate by means of a special adhesive layer. In that connection the lacquer layers are applied to the carrier film in a printing procedure. In that way it is possible to produce suitable decorations which then appear on the substrate which is decorated with the hot stamping foil.
For the purposes of transfering the decorative layer arrangements of hot stamping foils, operation must be conducted with a sufficiently high pressure and adequate temperature in order to ensure clean detachment of the regions of the decorative layer arrangement which are to be transferred, on to the substrate, because the decorative layer arrangement enjoys comparatively high stability. That means that comparatively stable tools must be employed. It is not possible to deal with hot stamping foils in the manner known for example from thermal printers because the print heads of thermal printers do not reach the temperatures and pressures required for the transfer of the decorative layer arrangement from hot stamping foils on to the substrate.
It is also already known for suitable substrates, primarily paper, to be decorated and in particular to be written upon, by thermotransfer printing. In this case also a suitable thermotransfer layer is transferred on the substrate from a carrier film. In that case the known thermotransfer layers permit operation with comparatively short temperature pulses and a low pressure, which makes it possible to construct suitable print heads with a fine degree of resolution, which heads can also be continuously varied in regard to the arrangement of the various dots, for example to produce figures and letters.
Hot stamping foils are increasingly used in recent times for applying security features to a wide range of different substrates. It is known for example for fine structures which have an optical-diffraction effect to be formed in the decorative layer arrangement of a hot stamping foil and for them to be transferred by a hot stamping process on to a substrate, for example a value-bearing paper or bond, a credit card, a pass or identity card or the like. In those areas of use there is sometimes a wish to provide the value-bearing document not only with the security feature which is the same for the entire series of value-bearing documents. Over and above that, individualisation of the value-bearing document is wanted in a large number of cases, for example by stating the name of the holder of a pass or identity card, by applying a reference number etc, in which case the individualising addition (name, reference number etc) is to be easy to alter from one document to another, but a change in the sense of forgery thereof is to be substantially prevented after it has been applied to the document.
It would now be possible, for that purpose, in a first working operation, to provide the value-bearing document with a security feature by means of a conventional hot stamping foil and then, in a second working operation, to effect individualisation by applying a word, a combination of figures or the like, by a thermotransfer printing process. That procedure however suffers in particular from the disadvantage that comparatively complicated machines are required, which transport the value-bearing document to be safeguarded or identified from a first station i
REFERENCES:
patent: 3961121 (1976-06-01), Warsager
patent: 4215170 (1980-07-01), Vilaprinyo Oliva
patent: 4415623 (1983-11-01), Schlaepfer
patent: 4477312 (1984-10-01), Czichy
patent: 5342672 (1994-08-01), Killey
Leonhard Kurz GmbH & Co.
Marn Louis E.
Yamnitzky Marie
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