How Sealant Film Choice Can Affect a Laminated Structure's Properties
When designing films for use as sealant layers, there are some functionalities that are well translated into the laminations’ properties, especially the sealant functionality that the film provides. Some properties, such as toughness, stiffness and “body” are not well understood once the films have been laminated to oriented substrates, primarily polypropylene (OPP) or oriented polyester (PET). Oriented substrates, such as OPP and PET, demonstrate orders of magnitude increases in stiffness over typical blown PE-based films. Therefore, when combining, through lamination, a soft, amorphous substrate, along with a rigid, crystalline substrate it is difficult to understand what the composite lamination’s properties will be. Packaging engineers, marketing departments, and brand managers would all desire to be able to understand, and even better, predict, these interactions.