According to the understanding of beverage bag manufacturers, the main inspection standards for food packaging bags (films) are as follows: GB / t4456-1996 blown polyethylene film for packaging, gb12025-1989 high density polyethylene blown film, QB / t2461-1999 degradable polyethylene film for packaging, gb9683-1988 hygienic standard for composite food packaging bags, and gb9687-1988 for food packaging The hygienic standard of polyethylene molding products for food packaging, gb9688-1988 hygienic standard for polypropylene molding products for food packaging, etc.
The inspection items of food packaging bags (films) are mainly divided into five categories
The appearance shall be free from defects such as air bubble, perforation, water mark, rib burst, poor plasticization, fisheye block, etc. The deviation of specification width, length and thickness shall be within the specified deviation range.
The physical and mechanical properties include tensile strength and elongation at break, which reflects the ability of the product to withstand tensile stress in the process of use. If this item is not qualified, the food packaging bag (film) is prone to rupture and damage in the process of using beverage bag manufacturers.
Sanitary properties include evaporation residue (acetic acid, ethanol, n-hexane), potassium permanganate consumption, heavy metals, decolorization test. Evaporation residue reflects the possibility of separating residue and heavy metal from food packaging bag when encountering vinegar, wine, oil and other liquids. Residue and heavy metal will have adverse effects on human health. In addition, the residue will directly affect the food quality such as color, aroma and taste.
According to the different degradation types of beverage bag manufacturers, the degradation performance 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 (membrane) will break, differentiate and degrade by itself under the joint action of light and microorganism, and eventually become debris and be accepted by the natural environment; if the degradation performance is not good, it will not be accepted by the environment, thus forming "white pollution". http://www.ycritai.cn/