Advertisement

Discrimination of Transparent Polyethylene Films Based on Identification of Inorganic Antiblocking Agents

Authors

  • Takashi Hashimoto M.Sc.,

    1. Forensic Science Laboratory of Hyogo Prefecture Police Headquarters, 5-4-1 Shimoyamate-Dori, Chuo, Kobe 650-0011, Japan.
    2. Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai-Cho, Nada, Kobe 657-8501, Japan.
    Search for more papers by this author
  • Minoru Mizuhata D.Sc.

    1. Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai-Cho, Nada, Kobe 657-8501, Japan.
    Search for more papers by this author

Additional information and reprint requests:
Takashi Hashimoto, M.Sc.
Forensic Science Laboratory of Hyogo Prefecture Police Headquarters
5-4-1 Shimoyamate-Dori
Chuo, Kobe 650-0011
Japan
E-mail: takashihashimoto@hkg.odn.ne.jp

Abstract

Abstract:  Several nondestructive and semidestructive analyses were used to discriminate colorless transparent polyethylene bags. Transparent plastic bags made from low-density and linear low-density polyethylene usually contain antiblocking agents to prevent sticking of the film, which makes it difficult to open the mouths of plastic bags. Inorganic antiblocking agents are uniformly dispersed in polyethylene films, so they are easily observed using optical microscopy. The particle size distributions of the antiblocking agents were compared by statistical tests. Particle composition was examined by elemental analysis using energy-dispersive X-ray spectrometry with a scanning electron microscope and by molecular vibration analysis using a sensitive microscopic Raman spectrometer. The compositions could be determined nondestructively on the basis of the results. These data reinforce the morphological discrimination. Morphological discrimination of the dispersed antiblocking agent powders, statistical comparison of particle size distributions, and compositional analysis of the antiblocking agents strengthen the ability to discriminate polyethylene films.

Ancillary