Thou shalt not pass - Barrier plastic packaging

摘要

Barrier is defined in many ways by food packaging practitioners. Some deal with physical protection. Others are obsessed with liquid moving through passages; still others with water vapor. Since the emergence of plastic materials as practical packagematerials, oxygen has been the principal environmental culprit whose movement must be controlled. For about a quarter century, or since the development of polyester as a carbonated beverage bottle structure, another focus has been on carbon dioxide. Flavor barrier is increasingly crucial in food and beverage content protection by packaging, and how could we forget fat (grease) and hydrocarbon barriers?