Woven security label
AssigneeNippon Dom Co., Ltd.
InventorYoshihiro Kimura
Life of this patent
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Abstract
A woven security label is woven from threads of synthetic fiber, which interweaves a piece of check warp or weft yarn. The check warp or weft yarn comprises one or more pieces of detectable filament containing a small amount of inorganic fluorescent substance. The check warp or weft yarn is substantially colorless in ordinary sunlight, electric light or the like but reversibly changes color under influence of specific UV light.
Claims5
A security device attachable to an article for use in confirming article authenticity, said security device comprising
- a label of woven material, and
- one of a check warp and a check weft yarn made from synthetic filaments interwoven with the label, the said one of a check warp and a check weft yarn comprising a detectable filament containing an inorganic fluorescent substance selected from the group consisting of Sr.sub.5 (PO.sub.4).sub.3 Cl:Eu, Zn.sub.2 GeO.sub.2 :Mn and Y.sub.2 O.sub.2 S:Eu, the detectable filament being made by adding inorganic fluorescent substance 1 to 3 .mu.m in diameter to a synthetic resin dope and spinning filament out of the resin material, the said one of a check warp and a check weft yarn being substantially colorless in a presence of sunlight and electric light but reversibly emitting a user discernible straight color line when irradiated with an UV light.
Method for making security labels which can be attached to articles for confirming article authenticity, said method comprising
- adding an inorganic substance which luminesces when radiated with UV light and selected from the group consisting Sr.sub.5 (PO.sub.4).sub.3 Cl:Eu, Zn.sub.2 GeO.sub.2 :Mn and Y.sub.2 O.sub.2 S:Eu, having 1 to 3 .mu.m in diameter, to a resin of one of polyester, nylon and polypropylene,
- spinning filaments out of the resin,
- providing one of a check warp and a check weft yarn from said filaments,
- weaving a wide figured cloth on a loom while interweaving the said one of a check warp and a check weft yarn into the wide figured cloth,
- cutting the wide figured cloth into label strips, and
- cutting individual widths of labels from each label strip.
Dependencies are inferred from the claim text.