Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1979-01-30
1981-01-27
Hess, Bruce H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
1563082, 156312, 162157R, 162158, 162162, 428172, 428283, 428286, 428516, 428916, B32B 3106, B32B 3110, B32B 3112
Patent
active
042473187
ABSTRACT:
A security paper is provided in which identifying material is contained in a plane within the thickness of a bonded, nonwoven polyethylene film-fibril sheet having an opacity of at least 70% and a determination resistance of at least 60 grams per centimeter. A process for making such paper includes forming an assembly of two unbonded, lightly consolidated, nonwoven, polyethylene film-fibril sheets containing identifying material between them, compressing the assembly in an unheated nip at 17 to 85 kilograms per centimeter of assembly width and then self-bonding the compressed assembly while under restraint by contact with a heated drum. Such security paper is useful for bank notes, stock certificates, paper currency and the like.
REFERENCES:
patent: 3169899 (1965-02-01), Steuber
patent: 3442740 (1969-05-01), David
patent: 3615996 (1971-10-01), Hasegawa et al.
patent: 4037007 (1977-07-01), Wood
"Properties and Processing of `Tyvek` Spunbonded Olefin", DuPont Tech. Bull. TK-3, Dec. 1978.
Lee Chi C.
Ludwig Richard E.
E. I. Du Pont de Nemours and Company
Hess Bruce H.
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