Development of plastic packaging
Development of plastic packaging
In 1936, the plastic film thermoforming method became the heat shrink packaging technology of meat food. Later, the vacuum technology was combined to extend the shelf life of meat food. The advancement of plastic molding technology, with its cost advantage, is not fragile Such characteristics have gradually replaced many glass bottle packaging. In addition, the original metal squeezable hose has also been gradually replaced by plastic beverage cans. In 1945, foamed polyurethane was developed and used in packaging in large quantities as a cushioning material. Since then, plastic materials have continued to improve. Although plastic packaging materials have been a serious problem since the 1990s, from the data published in recent years, plastics are still one of the fastest growing materials in the packaging industry.
At the beginning of the 21st century, with the increasing growth of the world economy and the continuous development of high technology, both daily necessities packaging, food packaging, and industrial packaging have higher requirements. On the other hand, as environmental protection calls become stronger and stronger, Under the condition of satisfying the packaging function, the amount of waste generated is reduced as much as possible, thus showing the trend of lightweighting and thinning of packaging films, containers and sheets, especially the development of polyethylene and polypropylene has further improved the structure of flexible packaging Many functions, such as toughness, transparency, heat resistance and puncture resistance, can reduce the heat sealing temperature, improve the processing technology, and increase the packaging production speed.
In the 21st century, in order to meet economic development, people's lives and market needs, and at the same time to adapt to environmental protection requirements, countries on the one hand strengthen research, develop environmentally-friendly plastic packaging materials and technologies, and actively study how to strengthen their comprehensive waste treatment And measures, technically ensure the healthy and smooth development of the plastics industry, and show the bright prospects of plastic packaging.
