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Anti-counterfeiting fiber and preparation method thereof

An anti-counterfeiting fiber and fiber technology, applied in fiber raw material processing, non-fiber pulp addition, textile and papermaking, etc., can solve the problems of complex process, high equipment requirements, fiber design and production restrictions, etc., to achieve easy identification of interest, strong anti-counterfeiting. The effect of ability, good designability

Active Publication Date: 2015-10-21
CHINA BANKNOTE SECURITY PRINTING TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of fiber is made by multi-component melt-spinning method, which is relatively complex and requires high equipment requirements, and the high temperature in the process of melting color imitation limits the application of some phosphors, resulting in more restrictions on the design and production of fibers. limit

Method used

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  • Anti-counterfeiting fiber and preparation method thereof
  • Anti-counterfeiting fiber and preparation method thereof
  • Anti-counterfeiting fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Step 1, with 91.6% polyamide (DuPont, PA12), 8% fluorescent powder A (Beijing Jinglue Anti-counterfeiting Technology Development Co., Ltd., colorless fluorescent red powder), 0.4% dispersant (Shanghai Sanzheng Polymer Material Co., Ltd., CH-1A) After being uniformly mixed by a high-speed kneader, the first fluorescent film with a thickness of 30 μm was made by twin-screw extrusion granulation, melt extrusion casting without stretching, and corona.

[0101] Mix 94.7% polyamide (same as above), 5% fluorescent powder B (Beijing Jinglue Anti-counterfeiting Technology Development Co., Ltd., colorless fluorescent blue powder), and 0.3% dispersant (same as above) through a high-speed kneader, and pass Twin-screw extrusion granulation, melt extrusion casting, 3-4 times stretching in the longitudinal direction, and corona to make a second fluorescent film with a thickness of 30 μm.

[0102] 35% alcohol-soluble copolyamide (DuPont, Elvamide8061), 3.5% titanium dioxide (DuPont, R9...

Embodiment 2

[0116] Step 1, take a 15μm thick PET aluminum-coated film, in which the thickness of the aluminum layer is 20nm (DuPont Hongji, model MA), and hollow out the aluminum-coated layer with a laser to form grid-like stripes with a pitch of 2mm, a width of 2mm, and a thickness of 20nm aluminum layer.

[0117] Step 2, the phosphor powder A that mass fraction is 5% is dispersed in polyvinyl alcohol aqueous solution, and then this solution is coated on one side of the aluminum layer of grid-like stripes of PET aluminized film (solution will be embedded in the coating process In the gaps of grid stripes), the first fluorescent film was obtained after coating and drying, with a thickness of 10 μm. Then, in the same way, a polyvinyl alcohol aqueous solution dispersed with phosphor powder B with a mass fraction of 5% was coated on the other side of the PET aluminized film in the same way, and the second fluorescent film was obtained after coating and drying, with a thickness of 10 μm. The...

Embodiment 3

[0125] step 1,

[0126] (1) After mixing 89.3% polyamide (same as Example 1), 10% fluorescent powder B (same as Example 1), and 0.7% dispersant (same as Example 1) through a high-speed kneader, pass through double The second fluorescent masterbatch was obtained by screw extrusion, and then the masterbatch was fed into a biaxially stretched film device to make a second fluorescent film a2 with a thickness of 28 μm.

[0127] (2) The first fluorescent ink made of 35% alcohol-soluble copolyamide (same as above), 5% phosphor A (same as above), and 60% ethanol.

[0128] (3) 35% alcohol-soluble copolyamide (same as Example 1), 3.5% titanium dioxide (same as Example 1), 0.3% UV absorber (same as Example 1), 61.2% ethanol made of ultraviolet absorbing ink.

[0129] It is also possible to add pigments that are colored under natural light during the preparation of the UV-absorbing ink, so that the color of the barrier layer and the fluorescent layer under natural light are different. ...

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Abstract

The invention provides anti-counterfeiting fiber. The fiber has a layered structure on the cross section, and at least comprises a fluorescent layer and a barrier layer. The layered structure extends in parallel without distortion along a fiber length direction. The fluorescent layer is distributed continuously along the fiber length direction. The barrier layer is distributed intermittently along the fiber length direction. The width of the barrier layer is larger than or equal to the width of the fluorescent layer. The fluorescent layer can emit visible light under excitation light irradiation. The excitation light transmittance of the barrier layer is lower than 10%. With the anti-counterfeiting fiber, a fluorescent discoloration effect can be provided with the changes in excitation light irradiation angle. Also, the fiber can have multiple sections of fluorescent colors under excitation light irradiation, and has a stipe fluorescent light emitting effect.

Description

technical field [0001] The invention relates to an anti-counterfeit fiber and a preparation method thereof, and also relates to an anti-counterfeit product containing the anti-counterfeit fiber. Background technique [0002] Adding colored or fluorescent fibers to paper is an effective anti-counterfeiting technique. Usually, colored or fluorescent fibers are added to the paper during the papermaking process. After the paper is formed, it can be observed that the paper contains colored or fluorescent fibers under natural light or ultraviolet light, which is different from ordinary paper in the society. Anti-counterfeiting effect. [0003] Both the 99 version of RMB and the current US dollar use monochromatic colored fibers. But this kind of monochromatic colored fiber is easily imitated by the printing lines of the same color, and it is difficult to distinguish the authenticity from the fake. There is also a colorless fluorescent fiber on the market, which is colorless und...

Claims

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Application Information

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IPC IPC(8): D21H21/42B42D25/36
Inventor 管文唐士立李彩卿徐斌柯光明欧阳苏阳韩丽琴
Owner CHINA BANKNOTE SECURITY PRINTING TECH RES INST CO LTD
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