Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
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.
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Du Pont Technical Bulletin TK-3, "Properties and Processing of `Tyvek` Spunbonded Olefin", Dec. 1978.
Lee Chi C.
Ludwig Richard E.
E. I. Du Pont de Nemours and Company
Hess Bruce H.
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