Definition Of Flexible Packaging Film

In the National General Terminology for Packaging (GB4122-83), flexible packaging is defined as packaging in which the shape of the container can change after filling or removing the contents. Various bags, boxes, covers, and envelopes made of paper, aluminum foil, fiber, plastic film, and their composites are all flexible packaging. Generally, sheet plastics with a thickness of 0.25mm or less are referred to as thin films. Plastic film is transparent and flexible, with good water resistance, moisture resistance, and gas barrier properties. It has good mechanical strength, stable chemical properties, oil resistance, and is easy to print exquisite graphics and text. It can also be heat sealed for bag making. It can meet the packaging requirements of various items and is an ideal material for packaging convenient food, daily necessities, and small packaged goods in supermarkets that are easy to store and place.
Plastic film based flexible packaging printing plays an important role in packaging printing. According to statistics, since 1980, plastic packaging in some advanced countries has accounted for 32.5% to 44% of the entire packaging printing.
Generally speaking, because a single film material does not provide ideal protection for the contents, composite films that combine two or more films into one layer are often used to meet the requirements of food preservation and aseptic packaging technology. The outer layer material of composite films is often made of materials that are not easy to scratch or grind, have excellent optical properties, and good printing performance, such as paper, glass paper, stretch polypropylene, polyester, etc; The intermediate layer is a barrier polymer, such as aluminum foil, aluminum vapor deposition, and polyethylene nitride. Non toxic and odorless thermoplastic resins such as polyethylene are often used for the inner layer material.