packaging film is a thin plastic layer used to preserve, protect, market and distribute various food items. it provides protection for loss of nutrients, color, aroma, taste, and maintaining the functional properties of food. packaging films also help protect food from the harmful effect of microorganisms. plastic films such as polyethylene, polypropylene, polyethylene terephthalate, polyvinylchloride, polyamide, and ethylene vinyl alcohol are used to package food. they also protect food from dirt, germs, liquids, and gases.