Packaging bags are divided into flexible packaging and rigid packaging. Our flexible packaging contains different products and uses different packaging bags, such as the common food packaging bags, cosmetic packaging bags, and pharmaceutical packaging bags on the market.

Packaging bags are divided into soft packaging and hard packaging. Our soft packaging contains different products and has different packaging bags, such as common food packaging bags, cosmetic packaging bags, and pharmaceutical packaging bags on the market. Let's take food packaging bags as an example. I believe many people don't know the difference between food packaging bags and other packaging bags on the market. In fact, there are many differences between the two. Firstly, in terms of raw materials, food packaging bags are made of food-grade plastic films. This film is composed of multi-layer composite films, which we often call hard plastic, transparent or printed. Secondly, in terms of use, food packaging bags should indicate relevant information, namely the name of the food, ingredients, nutritional components, implementation standards, shelf life, storage methods, consumption methods, and manufacturer's information, etc.

Food packaging safety is a global issue. China's food packaging safety standard is QS, which is short for QUALITY SAFETY. The leaching substances of packaging materials are the key to affecting food safety and hygiene. As early as 1980, the world food packaging expert CONORRELIY discussed this in the book "METAL CONTAMINATION OF FOOD." It is also stipulated in the HACCP safety system in recent years.

We can also distinguish between paper packaging and plastic packaging as food packaging, and we can also analyze the differences between paper packaging and plastic packaging:

1. Paper packaging. Paper is an ancient and traditional packaging material, but its safety hazards cannot be ignored. The main reason is that chemicals such as anti-seepage agents/sizing agents, fillers (to make the paper opaque), bleaching agents, and dyes are added to the pulp during the papermaking process. The anti-seepage agent mainly uses rosin soap; water-soluble dyes and pigments are used as dyes, the former including acid dyes, basic dyes, and direct dyes, and the latter including inorganic and organic pigments.

2. Plastic packaging. Plastic is a widely used food packaging material. Plastics are generally divided into thermosetting and thermoplastic types. The former includes urea resin UF, phenolic resin PF, and melamine resin MF; the latter includes polyvinyl chloride resin PVC, polyvinylidene chloride resin PVDC, polyethylene PE, polypropylene PP, polystyrene PS, nylon NY, styrene resin AS, styrene resin ABS, and polyester resins such as PET and PEN.