Environmental Protection of Packaging Materials (I)

In today's world, with the rapid development of modern commodity economy, all new commodities emerging in the market need timely new packaging. This will inevitably promote the modern packaging industry to develop at a correspondingly high speed.
China's modern packaging industry has undergone several years of adjustment since the 1970s and began to develop rapidly in the early 1980s. The situation of “first-class products, second-class packaging, and third-class prices” formerly in the world has gradually changed, and people’s ideas and understanding of packaging have also undergone qualitative changes. The added value of commodity package graves has brought rewards to most companies, and the new packaging has also enabled them to increase their competitiveness on the world stage of the economy.
With the development of productivity and the diversification and mass production of products, people have pushed the packaging to a higher stage, so that the original function of protecting the products of packaging has been increased to the role of “silent salesman” and packaging has been given new ones. mission. The task of product promotion undertaken by packaging promotes the diversification of packaging materials and the improvement of quality standards.
The packaging materials are closely related to the quality of the packaging, and therefore, the most important chemical stability (anti-aging) of the physical properties (density, hygroscopicity, barrier property, thermal conductivity, heat insulation, heat resistance, etc.) and chemical properties of the packaging materials. , corrosion resistance, etc.) and its mechanical properties (elasticity, plasticity, strength, toughness, brittleness, etc.) must be carefully studied and mastered. In addition, the craftsmanship of packaging materials can not be ignored. In the processing and use of packaging materials, it is necessary to facilitate molding and assembly in order to increase the mechanization, high efficiency, scale, and automation. This is also necessary for the development of packaging materials.
In the initial stage of packaging, packaging materials are sourced from nature. Ancient Chinese people used a variety of packaging materials in their production practices and commodity exchanges, from grass, wood, rattan, willow, bamboo to paper, cloth, silk, satin, and hemp, from various metalware, various types of utensils, The appearance of silicates to today's plastic films and composite packaging materials has been going through a long period of time. The ancestors of our country created colored pottery as early as 5,000 years ago. This is an excellent container for preserving food. The production of man-made packaging materials, such as paper, glass, and metal, provides better containers for packaging, such as cartons, glass, and metal cans; Invented artificial synthetic materials in the 1950s—plastics—substantially replaced packaging materials processed by natural resources and promoted the emergence of new packaging machinery. This is the fastest-growing stage of packaging technology; composite packaging materials developed in the 1970s, such as aluminum plastic Composite materials, paper-plastic composite materials, and plastic-plastic composite materials can replace metal, glass, paper and other packaging materials, improve the barrier properties, structural properties, and printing properties of packaging, making packaging more convenient and safe. During the 20 years since the 1980s, packaging materials in China have developed rapidly.
The development of packaging materials is the material basis for packaging development. During the first five-year plan of the country, the state gave more investment to the paper industry and established a number of large-scale papermaking companies. During the second five-year plan, a number of small and medium-sized paper mills were set up in various regions. In the 1960s, the country again invested in the construction of a number of large and medium-sized paper mills, which made great changes in the appearance of China's paper industry. By 1981, the production of machine-made paper and board had reached 5.4 million tons, which was 50 guarantees for the production of machine-made paper and board in 1949; the variety of paper has increased greatly, reaching more than 430 species, which has increased by more than 400 species since the founding of the People's Republic of China. A large part of the paper and paperboard produced by the paper industry in China is used for packaging. By 1988, paper packaging products reached 2.9 million tons, an increase of 750,000 tons compared with 1985. Paper products occupy an important position in the entire packaging industry system.
China's plastic products industry is a new industry developed after the liberation. During the first five-year plan period, the development of thermosetting plastic products was the mainstay; during the second five-year plan, daily plastic products began to develop; in the early 1960s, the production of blown film began, and in addition to agriculture and industrial use, there were few High-pressure polyethylene film made of lightweight bags for packaging use. The 1960s was a turning point in the transition from thermoplastic plastic products to thermoplastic plastic products in China's plastics industry. In the early 1970s, small and medium-sized enterprises actively developed plastic products for packaging according to the needs of the market. After 1972, polyolefin products were greatly developed in packaging. In recent years, packaging plastic products have developed rapidly. High-pressure polyethylene, low-pressure polyethylene, polypropylene, polyvinyl chloride and polystyrene have become the main packaging materials, various composite films and various plastic containers, hollow bottles, woven bags, etc. Also got rapid development. Especially in recent years, the production and use of PET, BOPP, nylon membranes, and aluminized membranes have grown even faster. (To be continued)