ANALYSIS OF THERMAL AND MECHANICAL PROPERTIES OF BIAXIALLY ORIENTED POLYPROPYLENE (BOPP) FILMS USED AS LABELS

Abstract

This study conducts multi-dimensional thermal and mechanical property tests on commercial BOPP label films used for wrap-around labels and pressure-sensitive labels. It sequentially completed thickness and density measurement, DMA analysis, and heat shrinkage testing. The experiments cover a temperature range from -20°C to 120°C, while distinguishing performance differences between the material’s MD (longitudinal direction) and TD (transverse direction). Test results confirm that the film exhibits excellent production reproducibility and wide-temperature-range stability, and can meet the core application requirements of commercial labels including high-speed labeling and thermal-sensitive label applications. This study uses DMA to characterize the relevant properties of BOPP label films.