Packaging bags are divided into flexible packaging and rigid packaging. Our flexible packaging contains different products of bread, and there are also different packaging bags, common food packaging bags, cosmetic packaging bags, pharmaceutical packaging bags and so on. Let us give an example of the characteristics of food packaging bags. I believe many people don’t know the difference between food packaging bags on the market and other packaging bags. In fact, there are many differences between the two. First of all, in terms of raw materials, food packaging bags must be made of food-grade plastic film. This film is composed of a multilayer composite film, which is what we often call hard plastic, transparent or printed. Secondly, in use, food packaging bags should be marked with relevant information, that is, the name of the food, food ingredients, nutritional content, implementation standards, shelf life, storage methods, eating methods, manufacturer information, etc.

Food packaging safety is a worldwide problem. The safety standard of food packaging in my country is QS, which is short for QUALITYSAFETY, which is the abbreviation for quality safety. The dissolution of packaging materials is the key to food safety and hygiene. As early as 1980, the world-renowned food packaging expert CONORRELIY discussed in the book "METALCONTAMINATIONOFFOOD". In recent years, it has also been stipulated in the HACCP safety system.

We can also distinguish between paper packaging and plastic packaging as food packaging. We can also analyze the difference between paper packaging and plastic packaging:

1. Paper packaging. Paper is the oldest and most traditional packaging material, but its hidden dangers of insecurity cannot be ignored. The main reason is that chemicals such as impermeable agents/sizing agents and fillers (to make the paper opaque) need to be added to the pulp during the papermaking process. Bleaching agent, dyeing agent, etc. The anti-seepage agent mainly uses rosin soap; the coloring agent uses water-soluble dyes and pigments, the former includes acid dyes, basic dyes, and direct dyes, and the latter includes inorganic and organic pigments.

2. Plastic packaging. Plastic is the most widely used food packaging material. Plastics can generally be divided into two types: thermosetting and thermoplastic. The former includes urea resin UF, phenolic resin PF, and trichlorocyanamide resin MF; while the latter includes vinyl chloride resin PVC, polyvinylidene chloride resin PVDC, polyethylene PE, polypropylene PP, polystyrene PS, nylon NY, Styrene resin AS, styrene resin ABS, polyester resin, such as PET, PEN, etc.