Security paper from film-fibril sheets

Details Security paper from film-fibril sheets Security paper from film-fibril sheets

1980-08-28

1982-01-12

Hess, Bruce H.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

162157R, 162158, 162162, 428286, 428296, 428323, 428516, 428916, B32B 516, D04H 104, D21D 300, D21H 382

Patent

active

043105912

ABSTRACT:
A security paper is provided in which identifying material is contained as an intercalary layer within the thickness of a bonded, nonwoven, polyethylene-film-fibril sheet having an opacity of at least 70% and a delamination 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: 34634 (1862-03-01), Hayward
patent: 1929828 (1933-10-01), Schlitz
patent: 2379443 (1945-07-01), Kantrowitz et al.
patent: 3037004 (1962-05-01), Wood
patent: 3169899 (1965-02-01), Steuber
patent: 3442740 (1969-05-01), David
patent: 3478141 (1969-12-01), Dempsey et al.
patent: 3615996 (1971-10-01), Hasegawa et al.
patent: 3880706 (1975-04-01), Williams
patent: 4069078 (1978-01-01), Marder et al.
Du Pont Technical Bulletin TK-3, "Properties and Processing of `Tyvek` Spunbonded Olefin", Dec. 1978.

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