Hashimoto Takashi, Mizuhata Minoru
Forensic Science Laboratory of Hyogo Prefecture Police Headquarters, 5-4-1 Shimoyamate-Dori, Chuo, Kobe 650-0011, Japan.
J Forensic Sci. 2012 May;57(3):744-9. doi: 10.1111/j.1556-4029.2012.02088.x. Epub 2012 Mar 5.
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.
采用了几种无损和半无损分析方法来鉴别无色透明的聚乙烯袋。由低密度和线性低密度聚乙烯制成的透明塑料袋通常含有抗粘连剂以防止薄膜粘连，这使得塑料袋口难以打开。无机抗粘连剂均匀地分散在聚乙烯薄膜中，因此使用光学显微镜很容易观察到它们。通过统计测试比较了抗粘连剂的粒度分布。使用扫描电子显微镜的能量色散X射线光谱法进行元素分析以及使用灵敏的显微拉曼光谱仪进行分子振动分析来检查颗粒组成。基于这些结果可以无损地确定组成。这些数据加强了形态鉴别。对抗粘连剂粉末的形态鉴别、粒度分布的统计比较以及抗粘连剂的成分分析增强了鉴别聚乙烯薄膜的能力。
