Dual-wavelength fluorescent anti-counterfeiting fibers with skin-core structure

Huihui Zhang; Yuanyuan Xu; Gesheng Yang; Yaopeng Zhang; Huili Shao; Yonggui Li

doi:10.1515/polyeng-2019-0189

Article

Dual-wavelength fluorescent anti-counterfeiting fibers with skin-core structure

Huihui Zhang , Yuanyuan Xu , Gesheng Yang , Yaopeng Zhang , Huili Shao and Yonggui Li

Published/Copyright: December 24, 2019

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From the journal Journal of Polymer Engineering Volume 40 Issue 2

Abstract

In this work, a skin-core structure was designed, and three kinds of dual-wavelength fluorescent anti-counterfeiting (DWFA) fibers, including UV short-wavelength/UV long-wavelength, infrared/UV short-wavelength, and infrared/UV long-wavelength excitable DWFA fibers with skin-core structure, were spun using fluorescent powder/PP pellets as the skin material and pure PP as the core material. The results showed that these DWFA fibers emitted two different colors of light under excitation of two different wavelength lights, which exhibited higher anti-counterfeiting safety. Take UV short-wavelength/UV long-wavelength DWFA fibers, for example; the influence of skin-core ratio on the structure and properties of fibers were investigated, and then the luminous efficiency of DWFA fibers with skin-core structure and homogenous structure was compared. The microscope photos and 3D simulation of fluorescent powder in fibers by confocal laser scanning microscope showed that the fluorescent powders were basically distributed in the skin layer of fibers. The crystallinity degree and tensile strength of DWFA fibers with skin-core structure decreased first and then increased with the decrease in skin-core ratio, whereas elongation of fibers showed an increasing trend. Compared with homogenous DWFA fibers, the skin-core DWFA fibers exhibited higher luminous efficiency under the same fluorescent powder content.

Keywords: dual-wavelength; fluorescent anti-counterfeiting fibers; photochromic properties; PP; rare-earth fluorescent powder; skin-core structure

Acknowledgment

We thank Lansen Lu of Donghua University for his help with melt-spinning process of DWFA fibers, and thank Research Center of Analysis and Measurement, Donghua University for the analysis and characterization of DWFA fibers.

Funding: This work was supported by the Open Project Program of Fujian Key Laboratory of Novel Functional Fibers and Materials (Minjiang University), China (FKLTFM1721), and the Fundamental Research Funds for the Central Universities of China (17D110622).

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Received: 2019-06-07

Accepted: 2019-11-13

Published Online: 2019-12-24

Published in Print: 2020-01-28

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Articles in the same Issue

https://doi.org/10.1515/polyeng-2019-0189

Keywords for this article

dual-wavelength; fluorescent anti-counterfeiting fibers; photochromic properties; PP; rare-earth fluorescent powder; skin-core structure