What are the materials of food bags.custom snack food bags

　　1、 Plastic packaging materials

　　1. It has the characteristics of light weight, convenient use, barrier, permeability, heat resistance, cold resistance and corrosion resistance, as well as colorful and beautiful appearance. Because of its rich source of raw materials, low cost and excellent performance, it has been widely used in food packaging, and has gradually replaced glass, metal, paper and other traditional packaging materials, which has greatly changed the appearance of food packaging. It is worth noting that plastic packaging materials have a prominent disadvantage, which is not easy to degrade, and burning will produce toxic gases. In addition, plastic packaging materials belong to the varieties with the shortest service life among plastic products, generally 1 month to 3 months, and the longest one year. Since then, most of them have become urban solid waste and enter the garbage treatment system, and some have been discarded at will, causing "white pollution".

　　2. Plastic packaging materials account for the largest proportion of the waste, and their pollution to the environment is also the most serious of all kinds of packaging materials. The current treatment scheme is a combination of recycling and development and application of degradable plastics. In addition, due to the defects of plastic products themselves, their moisture resistance and barrier properties are generally not as good as those of metal and glass containers, so it is very important to improve the existing plastic properties, develop new varieties, improve strength and barrier properties, reduce consumption, reuse, classification and recovery.

　　2、 Paper packaging materials

　　1. In the modern packaging industry system, paper and paper packaging containers occupy a very important position, accounting for 40%~50% of the total amount of all packaging materials. Compared with other materials, it has a series of unique advantages: good processing performance, good printing performance, certain mechanical properties, easy to composite processing, good line performance, good health and safety, and a wide range of raw materials, diverse varieties, low cost, easy to form mass production, light weight of paper packaging containers, good cushioning, wide application, recyclable waste, no white pollution. With the enhancement of people's awareness of environmental protection and the actual needs of life, the development of plant fiber fast food boxes and the development of natural green packaging materials will be the trend of food packaging materials for paper products in the future.

　　2. In addition, with the rapid development of packaging technology, edible packaging paper is an important development direction of modern food packaging. This kind of packaging has important environmental protection and economic value. At present, there are two kinds of edible paper in foreign countries. One is to take vegetables as the main raw material and dry them after molding; The other is to gelatinize starch and sugar, add other food additives, and strive to shape in a similar way to paper making. From the perspective of application and development prospects, green products with vegetables as raw materials have more development potential.

　　3、 Metal packaging materials

　　The excellent performance of metal packaging materials includes: high barrier, excellent mechanical properties, good container forming and processing technology, good high and low temperature resistance, thermal conductivity and thermal shock resistance, good surface decoration, and easy recycling of packaging waste. Canned food and some liquid, paste, powder or high-grade food are often packed with such materials. The commonly used metal packaging materials include tinplate and aluminum, which are widely used in the manufacture of food and beverage packaging cans.

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