Printed matter – Having revealable concealed information – fraud preventer or... – Having plastic laminate
Patent
1991-01-10
1992-08-04
Eley, Timothy V.
Printed matter
Having revealable concealed information, fraud preventer or...
Having plastic laminate
283107, 283 95, B42D 1500
Patent
active
051352630
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a laminated identity card, in particular intended for inclusion in a passport, and a method for the manufacture of such a laminated identity card.
A known laminated identity card is shown in FIG. 1. The identity card 1 consists of a top covering layer 2 which is fixed using an adhesive layer 3 to a photographic emulsion layer 4 provided with identity information and arranged on a bearing layer 5. The other, bottom covering layer 6 is fixed to the bearing layer 5 using an adhesive layer 7. In other words, the top covering layer 2 is adhered to the emulsion layer 4 and the bottom covering layer 6 is adhered to the bearing layer 5. A drawback of this known identity card 1 is that there is a difference in adhesive strength between the adhesion of the top covering layer of the emulsion layer and that of the bottom covering layer on the bearing layer, with the result that the different layers can be easily separated from each other without damage. By means of corona treatment or by flame treatment a reduction of the difference in adhesive strength can be achieved in the case of cold delamination because damage then occurs in the photographic emulsion layer. In the case of hot delamination there is hardly any improvement.
The invention has for its object to improve the known laminated identity card in the sense that under all circumstances when delamination takes place damage to the photographic emulsion layer occurs, as a result of which this card is notably more difficult to falsify. This is achieved according to the invention in that the laminated identity card according to the invention comprises an emulsion layer intended for identity information which is adhered on both sides to a covering layer.
The invention is based on the insight that, as a result of omitting the bearing layer for the photographic emulsion layer, both outer covering layers are adhered to the photographic emulsion layer with substantially the same adhesive strength, with the result that on delamination the photographic emulsion layer remains partly adhered to the top covering layer and partly to the bottom covering layer end is consequently irreparably damaged. In addition the cohesion in the photographic emulsion layer must thereby be smaller than the adhesion between each of the adhesive layers and the photographic emulsion layer. This identity card according to the invention is thus optimally protected against falsification.
An additional advantage is that through the absence of the bearing layer the stiffness and strength of the laminated identity card is reduced which results in it becoming more flexible and less damage being caused as a consequence of bending or folding.
The invention further relates to a method for the manufacture of a laminated identity card according to the invention, which method comprises the steps for
a) the provision of a photographic emulsion layer intended for identity information;
b) the adhesion of a first covering layer to the one surface of the photographic emulsion layer; and
c) the adhesion of a second covering layer to the other surface of the photographic emulsion layer.
In principle it is possible for the photographic emulsion layer to be arranged on the bottom covering layer which then functions temporarily as bearing layer. However it is advantageous to use photographic material that in principle is available on the market so that, after applying the top covering layer on the photographic emulsion layer, the bearing layer must first be removed prior to application of the bottom covering layer. The removal of the bearing layer can be carried out easily if use is made of photographic paper with an emulsion easily separable from the bearer (paper or plastic foil).
Mentioned and other features of the laminated identity card and its method of manufacture are described in the description following hereafter of a non-limitative embodiment, while reference is made to the annexed drawing.
In the drawing:
FIG. 1 shows a perspective view of a known identity card;
FIG. 2 is
REFERENCES:
patent: 4589687 (1986-05-01), Hannon
Eley Timothy V.
Fridie Jr. Willmon
Sallmetall B.V.
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