Union Packing is a professional Stand up Pouch manufacturer, 24-hour online service to provide you with a quick quote for stand up pouch packaging, craft stand up pouches, printed stand up pouches. Snacks include potato chips, biscuits, candies, etc., for which packaging films are the most widely used. Snack food are mainly packaged in composite packaging bags. The most commonly used materials are OPP film, PET film, aluminum film, and LDPE film. Because oxygen combined with ultraviolet rays will accelerate fat oxidation, aluminum foil is often used in packaging bag to block light and oxygen for some potato chips and biscuits with high fat content and long shelf life.