Paper making and fiber liberation – Processes and products – Safety – identification and fraud preventing paper
Patent
1989-04-13
1990-10-23
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
Safety, identification and fraud preventing paper
162105, 162138, D21H 2140
Patent
active
049649515
ABSTRACT:
A process for making a paper product that includes both means for preventing images from being copied from the paper product by use of a xerographic photocopier; and means for enabling detection of the paper product when the paper product is transported through an interrogation zone of an article surveillance system. The process includes the steps of (a) mixing paper ingredients with a material selected from a group of materials that either respond to light within a predetermined portion of the light spectrum by flooding the light sensing means of the photocopier so as to obsure any image defined by print on the paper product, or totally absorb light within the predetermined portion of the light spectrum so that no light is received from the paper product by the light sensing means of the photocopier; (b) mulching the mixture of step (a); (c) embedding in the mulch during step (b) means for producing a unique signal in response to an interrogation signal; and (d) drying the mulched mixture of step (b) to provide a sheet of the mulched mixture. The embedded means include a heat-treated amorphous magnetostrictive wire that responds to magnetic reversal by producing a high amplitude signal over a wide range of harmonics of the magnetic reversal frequency.
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Callan Edward W.
Hastings Karen M.
Security Tag Systems, Inc.
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