Security fibers and process for the preparation thereof

Details Security fibers and process for the preparation thereof Security fibers and process for the preparation thereof

2000-09-01

2003-07-15

Chin, Peter (Department: 1731)

Paper making and fiber liberation

Processes and products

Safety, identification and fraud preventing paper

C162S146000, C162S162000, C008S479000, C008S481000, C008S482000, C057S200000, C057S243000, C057S309000

Reexamination Certificate

active

06592716

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to security fibers, a process for the preparation thereof and a security paper containing same.
BACKGROUND OF THE INVENTION
Security documents such as bank notes, stocks, bonds, checks, warrants and identification cards need to be guarded by antifalsification measures and they are often made from a security paper having a security element in the form of fibers, strips or threads embedded therein.
Japanese Laid-open Patent Application No. 90-293500 discloses a security paper containing security fibers prepared by dyeing a natural or synthetic fiber uniformly with a visible or invisible fluorescent dye and cutting the dyed fiber to a given length. However, such monochromatic security fibers have limited effectiveness in the prevention of counterfeiting.
Korean Patent No. 111,723 describes multi-colored security fibers prepared by a process comprising the steps of: placing a mask over a section of a fiber and dyeing the exposed section of the fiber with a first dye; replacing the mask over to the dyed section thereby exposing the undyed section; dyeing the undyed section of the fiber with a second dye; and cutting the fiber to a suitable length to obtain multi-colored security fibers having an enhanced security feature.
However, this complicated process has a low productivity.
SUMMARY OF THE INVENTION
Accordingly, it is a primary object of the present invention to provide an improved process for preparing security fibers suitable for use in a security paper.
It is another object of the present invention to provide novel security fibers suitable for use in a security paper.
It is still another object of the present invention to provide a security paper containing security fibers having an enhanced security features.
In accordance with one aspect of the present invention, there is provided a process for preparing security fibers which comprises the steps of: i) braiding 5 to 30 denier fibers to form a twine; ii) dyeing the twine with a dye or pigment; iii) drying the dyed twine; and iv) cutting the dried twine to give the security fibers in the form of cut fibers.


REFERENCES:
patent: 689559 (1901-12-01), Meyer
patent: 1913410 (1933-06-01), Rivat
patent: 2208653 (1940-07-01), Whitehead
patent: 2430153 (1947-11-01), Womble et al.
patent: 3153106 (1964-10-01), Schlick
patent: 2593840 (1987-08-01), None

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