CRITICAL EVALUATION OF THE MECHANICAL AND CHEMICAL PERFORMANCE OF THE MULTI-LAYER (BOPP+ METALLIZED CPP) FLEXIBLE PACKAGING LAMINATES

Abstract

This study provides the mechanical and chemical performance of multi-layer flexible packaging laminates composed of Biaxially Oriented Polypropylene (BOPP) and Metallized Cast Polypropylene (Met CPP). The research focuses on how varying conditioning temperature (10°C,25°C and 45°C) impacts substrate properties, including Seal strength, Bond strength, Coefficient of friction (COF), Water Vapor Transmission Rate (WVTR) and Oxygen Transmission Rate (OTR).

Doing the experiments indicates that ambient conditioning (25° C) provides the most consistent mechanical performance, provides the highest seal and bond strength; however, in the chemical barrier, performance is highest at a lower temperature (10°C) because of the reduced molecular mobility, which minimizes gas and moisture permeation. On the other hand, at the higher temperature (45°C) it is found that it increases permeability and reduces surface resistance with an increase in slip, meaning a lower Coefficient of Friction (COF), reducing shelf-life protection of the flexible food packaging.