Every day, we are exposed to a variety of food packaging materials and plastic products, such as plastic shopping bags, plastic cups, plates, plastic bottles and so on. However, we may not know that these plastic products are made of different resin materials. Different resin materials may precipitate toxic and harmful substances under different conditions of temperature, humidity, etc., which is unsafe. So how do we know what the material of the food packaging is?
Plastic packaging materials
1.It has the characteristics of light weight, convenient use, barrier property, permeability, heat resistance, cold resistance, corrosion resistance, and the appearance of colorful and beautiful appearance. Because of its abundant raw materials, low cost and excellent performance, it has been widely used in food packaging, and has gradually replaced traditional packaging materials such as glass, metal and paper, which has brought about a huge change in the appearance of food packaging. It is worth noting that plastic packaging materials have a prominent shortcoming that is not easily degraded, and incineration produces toxic gases. Moreover, plastic packaging materials belong to the shortest period of use in plastic products, generally 1 month to 3 months, the longest one year. Most of the time, most of the urban solid waste enters the garbage disposal system, and some are discarded at will, resulting in "white." Pollution".
2.Plastic packaging materials account for the largest proportion of waste, and the pollution caused by the environment is also the most serious of all kinds of packaging materials. The current treatment scheme combines recycling and development of degradable plastics. In addition, due to the defects of plastic products, their moisture resistance and barrier properties are not as good as metal and glass containers. Therefore, the performance of existing plastics is improved, new varieties are developed, strength and barrier properties are improved, usage is reduced, and reuse and sorting are recycled. It is very important.
Paper packaging material
1.In the modern packaging industry system, paper and paper packaging containers occupy a very important position, accounting for 40% to 50% of the total packaging materials. Compared with other materials, it has a series of unique advantages: good processing performance, excellent printing performance, certain mechanical properties, easy compound processing, good lineability, good health and safety, and wide range of raw materials, variety, and low cost. It is easy to form large-scale production. The paper packaging container is light in weight, good in cushioning, widely used, and waste can be recycled and used without white pollution. With the enhancement of environmental awareness and the actual needs of life, the development of plant fiber snack boxes and the development of natural green packaging materials will be the future trend of paper packaging materials.
2.With the rapid development of packaging technology, edible packaging paper is an important development direction of modern food packaging. This packaging has important environmental and economic value. At present, there are two kinds of edible papers in foreign countries, one is to use vegetables as the main raw material, and the vegetables are molded and dried; the other is to gelatinize starch and sugar, add other food additives, and strive to form a method similar to papermaking. From the perspective of application and development, green products based on vegetables have more potential for development.
Metal packaging material
1.The excellent performance of metal packaging materials includes: high barrier property, excellent mechanical properties, good processability of container molding, good high and low temperature resistance, thermal conductivity and thermal shock resistance, good surface decoration and easy packaging waste. Recycling treatment. Canned foods, as well as some liquid, paste, powder or high-grade foods. Commonly used metal packaging materials are tinplate and aluminum, which are widely used in the manufacture of food and beverage packaging cans.
2.Food packaging materials must be familiar with and master the resources, performance, price and processing conditions of various packaging materials. There are many different types of packaging materials, each with different characteristics. In terms of physical properties, some are hard, some are soft, some are airtight, impervious, some are transparent, some are brittle, etc.; in terms of chemical properties, some are relatively stable, some are easy to be with certain substances. Chemical reactions; there are also differences in terms of printing and decorative properties. Therefore, when we choose the packaging material, we must measure it with our own products.
