Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1996-12-20
1998-03-24
Ryan, Patrick
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428 46, 428172, 428203, 428209, 428327, 428339, 428344, 428352, 4284237, 428480, 4284884, 428913, 427147, 427250, 156230, 156240, 156247, B32B 900
Patent
active
057310645
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a stamping foil, in particular a hot stamping foil, comprising a carrier film and a transfer layer assembly which is detachable therefrom and which-starting from the carrier film--has at least a transparent protective lacquer layer, a decoration layer structure which is formed by at least one layer and which includes decorative or security elements, and an adhesive layer serving to fix the transfer layer assembly on a substrate.
2. Description of the Related Art
Stamping foils of that kind and in particular hot stamping foils are known in a very wide range of different configurations. In use thereof, the transfer layer assembly is transferred from the carrier film onto a substrate under the effect of heat and pressure. The corresponding transfer layer assembly adheres to the substrate by means of the adhesive layer which is generally a hot adhesive or an adhesive which can be caused to harden by radiation. Now, in a large number of situations of use, the position is that the transfer layer assembly is not to be transferred over its full surface area onto the substrate, but only certain regions of the transfer layer assembly, for example decorative elements which are produced in the transfer layer assembly in per se known manner by means of printing processes etc. are to be transferred. Hot stamping foils are also used to a great extent in particular for applying security elements for example to value-bearing papers such as banknotes, credit cards, passes and identity cards etc. or other articles to be safeguarded. In that respect, it is important that only the respective security element, or the region of the transfer layer assembly which corresponds to the security element, is released from the carrier film and fixed on the substrate.
Hitherto, if the transfer layer assembly is to be transferred onto the substrate only in a region-wise manner, the procedure generally adopted is such that the stamping foil is pressed against the substrate by means of dies or stamping punches of suitable configuration. The required pressure is then applied to the transfer layer assembly only in the region of the stamping punches, and that is intended to provide that only the part of the transfer layer assembly which is acted upon by the punch member adheres to the substrate, while the remainder of the transfer layer assembly is pulled off with the carrier film.
That procedure suffers from a number of disadvantages. On the one hand, it has been found that the high operating speeds which are required precisely when producing large numbers of items, for example when printing banknotes, and consequently the high levels of transfer capacity, can be achieved in a simple manner only when rolling processes are used for applying the stamping foil transfer to the substrate. In that respect, difficulties are involved in so designing rollers that the surface thereof forms individual stamping punch portions, by virtue of suitably raised regions of that surface. With this kind of operation, problems are also incurred in regard to accurate alignment of the decorative or security element to be transferred, with the stamping region which is respectively used for the transfer operation.
If only regions of the transfer layer assembly are to be transferred from the carrier film onto the substrate by means of a stamping punch, there is also the problem that only quite specific materials can be used for the transfer layer assembly. In actual fact, the materials must be so selected that the transfer layer assembly tears off cleanly along the edge of the stamping punch member, while in addition it is necessary to ensure, by virtue of a specific choice of the release layer between the transfer layer assembly and the carrier film, that the transfer layer assembly easily detaches from the carrier film in the regions which are to be transferred onto the substrate, but in the other regions it adheres satisfactorily to the carrier film. Particularly if, in an operation of that
REFERENCES:
patent: 4426422 (1984-01-01), Daniels
patent: 5102497 (1992-04-01), Hamaguchi et al.
patent: 5300169 (1994-04-01), Tahara
Bahta Abraham
Frayne Clifford G.
Leonhard Kurz GmbH & Co.
Marn Louis E.
Ryan Patrick
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