The performance characteristics of roll films include tensile strength, elongation, tear strength, and puncture resistance. These parameters determine whether the film is prone to breakage or deformation during winding, cutting, packaging, and transportation. Films with good mechanical properties ensure packaging integrity and can withstand the high-speed processing demands of automated production lines. Roll films need to possess certain barrier properties and environmental resistance, such as barrier against oxygen, moisture, and oils, antistatic properties, resistance to high and low temperatures, and resistance to chemical corrosion. These indicators relate to the product's shelf life, storage safety, and reliability, and are particularly important in the packaging of food, pharmaceutical, and chemical products.
The performance indicators of roll films also include printability and appearance. The film should have good surface smoothness, gloss, and print adhesion to ensure clear printed patterns, uniform colors, and the ability to withstand heat shrinkage or lamination without fading or peeling. Furthermore, visual and tactile indicators such as transparency, flexibility, and feel are also important standards for evaluating the overall quality of roll films.
