Traditional packaging generally only uses the physical means of packaging materials to block the impact of the external environment on product quality, and pays attention to mechanical protection, product material infiltration and migration and other functions. However, it takes little consideration to prevent or delay the deterioration of products caused by oxygen, moisture, microorganisms and other factors, which is called “negative packaging” at home and abroad. With the rapid development of science and technology and the emergence of various new functional soft packaging materials, traditional packaging is rapidly developing towards new functional activities such as antibacterial and antioxidant properties, and packaging technology is developing towards new technologies such as modified atmosphere packaging, aseptic packaging, microwave packaging, known as “proactive packaging”. Therefore, due to its diversified forms, exquisite printing patterns, light weight and energy saving, flexible packaging has rapidly and gradually replaced the traditional tin cans and glass bottles, becoming the mainstream direction of food, medicine and other product packaging. Like traditional packaging, flexible packaging has many reasons for its emergence and development, mainly including:; 1. The launch of each consumer product has provided new opportunities for flexible packaging; 2. The convenience provided by flexible packaging to consumers is beyond the reach of other packaging methods; 3. For many consumer products, flexible packaging can extend the shelf life of products, and colleagues can improve the safety of products; 4. The innovative development of printing technology and prepress design provides a good opportunity for the development of flexible packaging, which helps consumer goods manufacturers to build the company’s brand image. Products placed on the shelf can attract consumers’ attention, thus stimulating consumers’ desire to buy. The development of the flexible packaging industry, to a large extent, stems from technological innovation. Some value-added functions of the flexible packaging, such as the development of reusable opening, suction nozzle, zipper, nozzle, vertical functional structure, and increasingly beautiful printing and decoration effects, are promoting the continuous development of the flexible packaging industry. The birth of flexible packaging almost coincides with the advent of packaging film. At the beginning of the 20th century, various kinds of soft plastic films appeared, and simple packaging of single-layer soft packaging materials appeared, which was generally used for scattered sales packaging with short shelf life. In the 1950s, due to the production of various composite processes and technologies, composite flexible packaging film materials came out. Since then, traditional packaging has entered a new era of modern packaging. A huge revolution in the packaging field has begun, and flexible packaging has developed rapidly. In this period, due to the limitations of the film processing technology and theory of the Soviet Union, the cost of composite flexible packaging was generally high and the function was single. Since the 1990s, with the emergence or update of aluminum foil processing technology, vacuum evaporation technology, film processing technology, etc., a large number of functional flexible packaging composite films have emerged, and flexible packaging has entered various fields of packaging, such as food packaging bags, drug packaging, and even transportation packaging.
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