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Separating Information on Transparent Polypropylene Labels on Packaging with Dual Properties for the Visible Spectrum

Denis Jurečić1, Jana Žiljak Gršić2, Diana Bratić1

  • 1Faculty of Graphic Arts, University of Zagreb, 10000 Zagreb, Croatia.

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|December 23, 2022
PubMed
Summary

This study introduces a novel method for embedding hidden near-infrared (NIR) security graphics within visible labels using digital printing. This enhances product security and prevents counterfeiting of packaged goods.

Keywords:
IR graphicsNIR spectrumV and Z informationpackagingpolypropylene labelsecurity printing

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Digital Printing Technology

Background:

  • Security features are crucial for authenticating high-value products, especially those in transparent packaging.
  • Current security measures often alter the visual appeal of product labels.
  • Integrating covert information discreetly is essential for effective anti-counterfeiting strategies.

Purpose of the Study:

  • To develop a method for printing dual-layer security graphics (visible and near-infrared) on transparent labels.
  • To create a "VZ" algorithm for seamless integration of visible (V) and near-infrared (Z) data in digital printing.
  • To demonstrate the application of this technology for securing high-value liquid products.

Main Methods:

  • Utilizing polypropylene material for transparent labels.
  • Employing digital printing techniques to embed near-infrared (NIR) graphics alongside visible (V) information.
  • Developing specialized toner compositions and colorants for dual spectral range printing.
  • Spectroscopic analysis to characterize toner properties and colorant recipes.

Main Results:

  • Successfully printed transparent linear NIR digital graphics on polypropylene labels.
  • Demonstrated that NIR graphics are invisible to the naked eye, preserving the label's original visual appearance.
  • Developed and published the "VZ" algorithm for integrating independent visible and NIR graphics.
  • Presented toner properties and colorant formulation methods for dual spectral ranges.

Conclusions:

  • The developed technique effectively integrates covert NIR security information without compromising the visible label design.
  • This method provides enhanced security against counterfeiting for products in transparent packaging.
  • NIR graphics can be reliably detected using standard NIR detectors or security cameras, enabling verification.