Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1992-12-15
1994-05-24
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428292, 428294, 428375, 428690, 428915, B32B 300
Patent
active
053147391
DESCRIPTION:
BRIEF SUMMARY
OBJECT OF THE INVENTION
The present invention relates to the structure of a new security paper, namely as used in the manufacture of bank notes and other kinds of valuable documents, within which paper are provided yarns or markings to enhance its security in the face of various modes of or attempts at counterfeiting.
BACKGROUND OF THE INVENTION
With this aim of preventing, or at any rate impairing, the forging of a document, security paper provided inside with sheets or yarns of a suitable nature to personalize the document, and thereby enhance its security, are well-known.
More specifically, security yarns are inserted in the paper at the sheet formation stage, so that they remain in the cellulose fibres, and hence any attempt at removing the same implies either tearing the paper or breaking the yarn, which clearly reveals that the document has been tampered with.
Thus, in theory, the provision of a security yarn stands as security for the genuineness of a document.
However, the contemporaneous evolution of counterfeiting techniques has made it necessary to gradually perfect these security yarns, improving their performance, or to put it otherwise, hindering the tampering or copying thereof by counterfeiters. In this sense, yarns have been provided with microprinted texts, which texts can for instance refer to the country of issue, the face value of the document, the date of issue thereof, and so forth, which texts cannot be perceived at first glance but are easily detected using a small magnifying glass or any other suitable means, such as viewing the same against the light, under ultraviolet light and so on.
Techniques have also been developed which expedite the appearance of the yarns on the surface of the paper at regular intervals, to be detected by touch and hence identified by an expert.
Along these lines of evolution, the applicant himself holds Spanish patent of invention application number P 8902252(1), which describes security paper and a method for obtaining the same, which provides for the security yarns to be obtained from an alloy of magnetic material subject to heat treatment comprising a sudden cooling from a starting temperature ranging between 800.degree. and 1500.degree. C. down to a final temperature ranging between -180.degree. and -225.degree. C., thereby to obtain an amorphous solid, devoid of the usual metallic crystalline structure, so that the obtention of this kind of security yarns by potential counterfeiters is almost impossible.
DESCRIPTION OF THE INVENTION
The security paper subject of the invention, using security yarns in accordance with the contents of the latter paragraph, stems from a line of development contemporaneous to that of the said patent of invention 8902252, with the same basic objective but following a different route.
More specifically, the characteristics of the security paper subject hereof lie essentially in the fact that one of the security elements thereof comprises the provision of groups of three or more yarns, duly braided to attain the following features:
- A personalization of not only the paper but also the actual multiple yarns, for the latter can bear different colours thereby to display, for instance, the colours of the flag of the country issuing the document or what other kind of personalization soever is deemed appropriate.
- The obtention of a raised portion on the document, with the typical roughnness and unevenness of a braiding, almost impossible to copy using the classical systems to provide polyester-based slivers having an evidently smooth raised surface.
The tactile detection of various braided yarns is far easier than the detection of a normal or smooth security yarn, and the said detection is easy for bank staff, such feature also applying to the detection of documents by the blind, who will find it far easier with these braided yarns to detect, for instance, bank notes.
PREFERRED EMBODIMENT OF THE INVENTION
Now then, in accordance with the above description, the essential characteristics of the security paper subject h
REFERENCES:
patent: 3880706 (1975-04-01), Williams
patent: 4652015 (1987-03-01), Crane
patent: 4756557 (1988-07-01), Kaule et al.
patent: 4897300 (1990-01-01), Boehm
patent: 5118349 (1992-06-01), Jalon
patent: 5161829 (1992-11-01), Detrick et al.
Fabrica Nacional de Moneda Y Timbre
Krynski William A.
Ryan Patrick J.
LandOfFree
Security paper for bank notes and other documents does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Security paper for bank notes and other documents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Security paper for bank notes and other documents will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1971680