In the synthetic tree, 25% is used in the packaging industry, which is an important sector in the packaging industry. Plastic packaging is one of the four major materials in the packaging industry: paper and cardboard account for 30%, plastic accounts for 25%, metal accounts for 20%, and glass accounts for 15%. The above two 25% fully demonstrate the importance of the plastic packaging industry. Although the plastic packaging industry is currently the second largest packaging material, its application scope is not as good as paper and cardboard packaging. However, the material packaging industry is developing at a rate of 5% per year, while other packaging materials, including paper and cardboard, metal, glass, ceramics, hemp cotton, etc., are only growing at a rate of 2%. Therefore, one day the plastic packaging industry will surpass paper and cardboard as the first packaging material.
The plastic packaging industry has developed with the continuous development of plastic raw materials, continuous progress in molding processes, and automation. It not only varies in variety and shape, but also in performance Packaging materials that can meet high barrier and various killing conditions have emerged. The previous high steaming bags were only specially developed by the US Naval Research Institute for the packaging of airline food (expensive in price). Since the successful development of this convenient and energy-saving plastic packaging material by Kou himself, it has been developing at a high speed of over 25% every year. It is not only used for personal consumption of 1kg per bag, but also for the production of large high-temperature cooking bags that exceed 2kg per bag. The appearance of the bags has also evolved from ordinary three sided sealed composite bags to various types such as self-supporting bags and four body bags. According to statistics, the structure of high-temperature cooking bags has been developed from the original two or three layers to more than 100 different materials and layers, packaging nearly 1000 kinds of various foods and vegetables to meet the needs of the people. It has also been exported from Japan to some countries with similar dietary habits to Japan. In 1990, there were 40 manufacturers specialized in producing high-temperature boiling bags in Japan, and by 195, the number had grown to 53. In 1990, about 50% of curry products and 25% of seafood and soup products were packaged in high-temperature steaming bags.
In terms of packaging containers, the original packaging containers for beverages were glass bottles, followed by paper composite cans, and then PET bottles. Nowadays, rigid PET bottles have become the largest packaging material for carbonated and non carbon beverages, accounting for 26-5% of beverage packaging containers in the United States in 2019. Glass bottles have decreased from 289% in 1981 to 19.56%, aluminum bottles are 39%, and plastic bottles are growing rapidly at an annual growth rate of over 3%. It can be said that even in countries where the plastic packaging industry faces the most difficulties, such as Italy, plastic materials will continue to develop at a much faster rate than other packaging materials, and many characteristics of plastic cannot be replaced by any other packaging material. The plastic packaging industry has not only occupied the sales packaging field, but also developed towards transportation packaging, which will ultimately force the current metal based “transportation packaging” to be replaced by plastic.
