Printed matter – Having revealable concealed information – fraud preventer or... – Having plastic laminate
Patent
1983-04-25
1985-08-20
Bell, Paul A.
Printed matter
Having revealable concealed information, fraud preventer or...
Having plastic laminate
402 80P, 206387, 40405, B42D 1500, B42F 1300, B42F 500, B65D 1904
Patent
active
045360162
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to the design, construction and production of paper-like "security tokens" such as bank-notes, travellers cheques, share script, personal identification papers and the like. It seeks to provide a durable token of high security, that is, one which is most difficult to forge.
BACKGROUND ART
In our prior Australian Pat. No. 488,652, a novel approach to the production of security tokens--particularly bank-notes--was disclosed and the serious problems which confront conventional bank notes with respect to forgery were described. The security token or bank-note disclosed in Patent No. 488,652 comprised a substrate of opaque thermoplastic sheet material intimately bonded to a web of woven or unwoven thermoplastic fibres, the substrate being printed as desired and having bonded thereon one or more optically-variable security devices. The fibrous web was employed to impart durability, crumple-resistance and tear-strength to the note. Where a security device (such as a Moire pattern) was employed which depended for its optically variable properties upon the transmission of light, it was necessary to punch out a hole in the substrate, insert the device and bond it in place with further layers of (transparent) plastic sheet material.
Although samples of bank-notes formed in this way performed most satisfactorily with respect to conventional notes regarding durability and security, they were complex and relatively expensive. Moreover, when transmission security devices were inserted in pockets in the substrate, an area of weakness and high stress was created which reduced both durability and security.
DISCLOSURE OF THE INVENTION
It has now been found that tokens such as bank-notes can be produced with the durability and security of those described in our prior patent No. 488,652 without the complication and expense of the central fibrous web and without necessitating the damaging discontinuity previously required when transmission security tokens were employed.
It will be appreciated that the vulnerability of conventional bank-notes to forging has come about because of the great advances which have been made in the technologies of paper-making, printing and photo-engraving. The approach to this problem adopted by the present invention, like that of our Australian Pat. No. 488,652, is based upon the difficulty of simulating optically-variable devices by photo-engraving techniques.
In this specification, the term "optically-variable" means having an appearance which changes reversibly with a change in viewing conditions, for example, with change in viewing angle or with change in temperature or pressure.
Accordingly, the bank-note (or other security token) of the present invention comprises a flexible film bearing printed or other identifying indicia and at least one optically-variable security device, characterised in that the substrate comprises a transparent, bi-axially-oriented polymeric film composite having a heat-activated adhesive coating and an opacifying coating and characterised in that said substrate, indicia and optically variable device are covered with a transparent protective layer of polymeric material intimately bonded to the substrate.
The substrate may comprise a laminate of two or more layers of transparent bi-axially-oriented polymer film, each of which is coated on both sides with a heat activated adhesive layer. Alternatively, the substrate could be a suitable single-layer film should such become available in commercial quantities. Preferably, this substrate is coated on both sides with an opacifying pigmentary coating, comprising a major portion of pigment in a minor proportion of a cross-linked polymeric binder, the coating being applied so as to leave at least one transparent area within the film within which the optically variable device may be placed. It is also preferable to hot-stamp the optically variable device in position on the composite substrate, to print both sides of the substrate and to cover both sides with a transparent protective lay
REFERENCES:
patent: 2395804 (1946-03-01), Gruchy
patent: 3245697 (1966-04-01), Nugent
patent: 3694285 (1972-09-01), Appel et al.
patent: 3950013 (1976-04-01), Tagliaferri
patent: 4186943 (1980-02-01), Lee
Brett Robert A.
Girolamo Mario
Ross John B.
Solomon David H.
Bell Paul A.
Heyrana Sr. Paul M.
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