From ancient times to the present, there are no shortage of packaging materials such as wood, metal, plastic, glass, ceramics, paper, chemical fiber, and composite materials. However, with the ever-evolving technology renewal and environmental issues, and the shortage of resources, the road to sustainable development has become an urgent task. Therefore, the concept of science and technology environmental protection is also deepening. Packaging materials are constantly being developed. In addition to traditional packaging materials, they can be reused. After use, they are easy to recycle, and easily handled, dissipated and degraded materials have become popular packaging materials. Plastic packaging new materials, new processes, new technologies, and new products continue to emerge, and they are developing in the direction of high performance, multi-functional environmental protection and harmonious development.
Plastics have elasticity and plasticity, can be dissolved in solvents, and can be melted by heating and have relatively low hardness and brittleness. Compared with other materials, plastics are resistant to chemical attack; glossy, transparent or translucent; good insulation; light and strong; easy processing; cheap; use a wide range; easy to color; high temperature. Therefore, plastics are also used in the packaging field.