Selecting the proper polyamide for multilayer food packaging films: intrinsic factors leading to performance considerations

Selecting the proper polyamide for multilayer food packaging films: intrinsic factors leading to performance considerations

Joao Costa
Developments Driven by Industry and Market Trends

Polyamides are well known materials in the flexible packaging industry. They provide abrasion resistance, increase aroma and vapor barrier, impart mechanical strength, and withstand wide temperature ranges. These characteristics are directly related to chemistry and morphology and can be modified by varying parameters such as comonomer ratios and molecular weight. To illustrate these intrinsic differences, various thermal and mechanical tests were performed on a PA6 and two different PA6/66 monolayer films prepared similarly to neutralize the effect of process conditions. Actual materials tested were Ultramid® B40L 01, Ultramid® C40L, and Ultramid® C37LC. This paper aims to explain how different chemistries yield different polymer properties such as tensile strength and elongation, tear, and puncture resistance. Furthermore, this data set will be used to illustrate why and when to use each of these different polyamides in flexible packaging applications