Multi-ply laminae and identification card

Details Multi-ply laminae and identification card Multi-ply laminae and identification card

1982-04-01

1984-01-31

Hess, Bruce H.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

40625, 40626, 40630, 283107, 283108, 428203, 428212, 428480, 428483, 428516, 428910, 428916, B23B 702, B23B 2716

Patent

active

044290152

ABSTRACT:
Multi-ply laminae are provided which are suitable for use as tell-tale indicators for identification cards, credentials and the like. The laminae are post-laminated to a core layer bearing a photograph or similar information or indicia. Thereafter attempts to delaminate the card result in fibers being torn from a uniaxially oriented polyethylene or polypropylene layer of the laminae. Attempts to readhere the layers with adhesives result in tell-tale indicia in the form of the torn fibers which cannot be adequately realigned or adhered so as to be unnoticeable. Moreover, attempts to heat seal the card after tampering causes the oriented polymer to shrink and opacify resulting in additional tell-tale indicia of tampering. In addition, the core comprises heat seal surfaces upon which printing and other indicia is placed whereby any attempt to alter the printing or other indicia results in destruction of the card.

REFERENCES:
patent: 3595736 (1971-07-01), Buteux
patent: 3684635 (1972-08-01), Staats
patent: 3869533 (1975-03-01), Janocha et al.

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