ABSTRACT
Originating from natural materials such as skins, leaves, and bark, tremendous progress has been made in the development of diversified packaging materials and packaging equipment. Packaging materials are commonly grouped into rigid and flexible structures. Plastic film, foil, paper, and textiles are flexible materials, whereas wood, glass, metals, and hard plastics are examples of rigid materials. The first type of packaging material to be discussed is plastic, which is technologically a complex class of materials. Packaging materials may be grouped into rigid and flexible structures. Plastic film, foil, paper, and textiles are flexible materials, whereas wood, glass, metals, and hard plastics are examples of rigid materials. Polyesters are plastics formed by the polymerization of esters. In general, they have reasonable clarity and poor feel and printability, but are strong, versatile, with good heat resistance.
