Simulated watermark printing system

Details Simulated watermark printing system Simulated watermark printing system

1988-12-05

1990-04-24

Barr, Josephine

Printing

Planographic

Rotary machines

101142, 101148, 101452, 106 20, 106 30, B41F 900, C09D 1100

Patent

active

049190440

ABSTRACT:
A wet laid watermark of uncoated paper is simulated by the use of a resin or resin-plasticizer mixture dissolved in a slow evaporating, high boiling solvent. A sufficient quantity of the low viscosity solution is printed onto an uncoated paper sheet of stationery grade by a standard flexographic press to penetrate the paper fiber and deposit a non-tacky solid having a refractive index which closely approximates that of cellulose. The resulting image of the print is visible to both faces of the paper sheet.

REFERENCES:
patent: 3978274 (1976-04-01), Blum
patent: 4407196 (1983-10-01), Matalia et al.
patent: 4652471 (1987-03-01), van Rooden et al.
patent: 4718340 (1988-01-01), Love
patent: 4765654 (1988-08-01), Nakamura
patent: 4824486 (1989-04-01), Lafler
patent: 4864925 (1989-09-01), van Kanegan et al.

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