Food packaging bag is a kind of product that is used more in the packaging industry, so it must pass the quality standard. What kind of quality inspection should be done before leaving the factory? Next, I'll give you a detailed introduction:
1、 The inspection items of food packaging composite film bags are mainly divided into the following categories:

The appearance should be smooth, without scratch, scalding, bubble, oil breaking and wrinkle, and the heat sealing should be flat without false sealing. The film shall be free from cracks, pores and lamination separation. There is no contamination such as impurities, foreign matters and oil stains. The soaking solution in bags shall be free of peculiar smell, odor, dirt and discoloration.

2、 Physical and mechanical properties
It includes tensile strength and cracking elongation, which reflects the ability of the product to accept stretching in the application process. If this item is not qualified, the food packaging bag will simply show the phenomenon of cracking and damage in the process of application.
In addition, it also includes gas barrier targets such as gas permeability, oil resistance, heat resistance, cold resistance and medium resistance, sealing and stripping force of bags, pressure resistance and falling resistance of bags. These goals reflect the reliability of food packaging bags in maintaining the inner packaging materials.
3、 Heating
The processing of plastic film bag must be done by heating, and there are problems of cracking, oxidation, degradation and degeneration of plastic when heated. Therefore, when processing plastic film or bag with resin, antioxidant, heat stabilizer and other additives should be added into the resin. Some film bags need antistatic, anti condensation and high smoothness because of the requirements of packaging technology and machinery or contents, so they need to participate in antistatic agent, antifogging agent, lubricant, opening agent and other additives. All of these additives must be tested by the test of GB 15139 "food safety toxicology review procedure" and proved to be non-toxic before they can be used, but there is also a restriction on the increase of the amount. Therefore, the low molecular weight substances that can be extracted from the products, namely transpiration residue, or things that can be oxidized and transformed, that is, the consumption of potassium permanganate, can not exceed the prescribed amount, and can not be used. Therefore, there should be a corresponding hygienic standard for molded products, the purpose of which is to avoid misuse and misuse of additives, and to better ensure that the materials directly packaged and touched with food have a high degree of health and safety performance.
4、 Materials
At present, China is not accustomed to the development of professional products in the development stage of technical specifications for flexible packaging. For example, the data structure of composite data flexible packaging is developing rapidly. Only the materials used include PE, PP, PVC, PVDC, pet, PA, EVOH, EVA, EEA, EMA, ionic polymer and a variety of inks The existing composite packaging data specifications only involve BOPP, LDPE, BOPA, pet, aluminum foil and other data, while there are no standards for the inspection of other composite film materials, which can only be implemented according to the existing specifications and relevant specifications.
Secondly, new post-processing methods of composite flexible packaging are constantly introduced, and there are many requirements according to the different contents and application scope of the packaging. For example, in the field of food packaging, in addition to the traditional pasteurization, boiling, 121 ℃ cooking, 135 ℃ cooking, microwave packaging, vacuum packaging and other different uses, its physical and chemical effect on the composite film bag is similar to the ordinary boiling heating Therefore, only the technical specification of cooking film bag is not enough,. There are also composite flexible packaging raw materials, auxiliary materials such as various films, adhesives, solvents, additives, there are many lack of corresponding professional norms or national standards
Dongguan Beite packaging film bag occupation and national standards and strict implementation, strengthen the inspection and supervision of food packaging, to avoid unqualified food packaging into shopping malls, coordinate and strengthen management, to ensure the healthy development of flexible packaging profession.