The grain packaging bag shall ensure that the food is clean within the shelf life

Grain packaging bags are generally composite packaging bags with more than two layers

The shell of grain packaging bag can separate food from oxygen, steam and stains. Anti leakage is also a necessary factor in packaging design. Some packages include desiccants or deoxidizers to extend the shelf life. Vacuum packaging or pumping the air from the packaging bag is also the main food packaging method. Keeping food clean, fresh and safe within the shelf life is the primary function of packaging bags.

Packaging can play an important role in reducing transportation safety risks. Bags can also prevent food from being classified into other goods. Food packaging can also reduce the possibility of food being eaten secretly. Some food packages are strong and have anti-counterfeiting marks to protect the interests of businesses from loss. The packaging bag can have laser logo, special color, SMS certification and other labels. In addition, retailers put electronic monitoring labels on food packaging bags to prevent theft, and consumers take them to the outlet of the store for degaussing.

QS mark is the market access mark of food quality and safety, that is, the mark of food production license. QS mark belongs to quality mark. The use of QS marks on the food produced by the enterprise indicates that the enterprise promises that its products have passed the inspection and meet the basic requirements of food quality and safety. Before leaving the factory, the food that implements the food quality and safety market quasi system needs to be printed (pasted) with QS mark on its package or logo. If there is no QS mark, it shall not be sold out of the factory. At present, China has implemented the food quality and safety market access system for three batches of 28 types of food.

According to different degradation types of products, they can be divided into photodegradation type, biodegradation type and environmental degradation type. Degradation performance reflects the ability of the product to be accepted by the environment after being used and discarded. If the degradation performance is good, the bag will break, differentiate and degrade by itself under the joint action of light and microorganisms, and become debris and accepted by the natural environment; If the degradation is not good, it will not be accepted by the environment, resulting in "white pollution".

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