Patent ID: 6054021
Filing Date: 2000-04-25
Classification: D21H,Y10S,Y10T

Abstract:
The process of manufacturing and testing authenticatable paper comprising:(a) treating a slurry of papermaking fibers selected from the group consisting of bleached chemical pulp and high yield lignin containing mechanical pulp with from 50-200 lbs/ton of a water soluble fluorescent whitening agent so as to cause said fluorescent whitening agent to become attached to said fibers;(b) mixing the treated fibers of step (a) with a bleached chemical papermaking furnish to achieve a concentration of treated fibers in the furnish of about 0.1-4.0 lbs/ton of the furnish;(c) producing a paper product from the papermaking furnish of step (b); and,(d) exposing the paper product of step (c) to long wave ultraviolet illumination to detect the presence of the individual treated fibers in the paper product wherein the individual treated fibers fluoresce blue.