Patent ID: 9725647
Date: 2017-08-08
CPC Classifications: C09K,D01D,D01F

Claim:
1. A method of preparing an anti-counterfeiting yarn, comprising: providing an up-conversion fluorescent material in a powder form having a particle size of about 0.3-7 μm; mixing the up-conversion fluorescent material with a molten polymer material to form a composite material; cooling the composite material, followed by cutting to provide a functional polymer chip (FPC); mixing the FPC with a polymer chip not containing the up-conversion fluorescent material in a ratio such that the fluorescent material is uniformly distributed in the mixture, followed by melting the mixture; extruding the melt of the FPC and the polymer chip not containing the up-conversion fluorescent material into filaments; and producing the anti-counterfeiting yarn through spinning and drawing the filaments, wherein the up-conversion fluorescent in the anti-counterfeiting yarn comprises a maximum weight percent of about 1.8%.