Multilayer identification card and a method of producing it

Details Multilayer identification card and a method of producing it Multilayer identification card and a method of producing it

1983-03-25

1985-03-26

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

283107, 283111, 283904, 427 431, 427 531, 427264, 427275, 428211, 428913, 428916, A23C 912, B32B 330

Patent

active

045073465

ABSTRACT:
A multilayer identification card bearing information such as letters, numbers, patterns, pictures and so on, in which at least part of the information is present in the form of a structure in relief in a foamable synthetic material. The foamable synthetic material is transparent or dyed in the visible spectral range and is present in the identification card in the form of a layer covering either its entire surface or part of it. The information in relief is produced by means of a laser beam recorder, the energy dosage of which is used to induce the locally controllable foaming process in the synthetic material compounded with chemical or physical blowing agents. The protection against forgery may be further increased by additionally photocuring the foamable synthetic layer.

REFERENCES:
patent: 3627858 (1971-12-01), Parts et al.
patent: 3949028 (1976-04-01), Murakami et al.
patent: 4268615 (1981-05-01), Yonezawa

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