National standard for inspection of the hottest fo

National standard for inspection of food packaging bags (films)

the main standards for inspection of food packaging bags (films) are: GB/t4456-1996 polyethylene blown 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 Gb9687-1988 hygienic standard for polyethylene molded products for food packaging, gb96 another "energy conservation and environmental protection" is an important direction in strategic emerging industries, 88-1988 hygienic standard for polypropylene molded products for food packaging, etc

the inspection items of food packaging bags (films) are mainly divided into five categories

the appearance shall be free of defects such as bubbles, perforations, water marks, broken tendons, poor plasticization, fish eye stiffness, etc., which are detrimental to use. The deviation of specification width, length and thickness shall be within the specified deviation range

degradation performance can be divided into photodegradation type, biodegradation type and environmental degradation type according to different degradation types of products. 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 microorganisms, and finally become debris, which is accepted by the natural environment; If the degradation is not good, it will not be accepted by the environment, resulting in white pollution

physical and mechanical properties include tensile strength and elongation at break, which reflect the ability of the product to withstand tension during use. If this item is unqualified, food packaging bags (films) are prone to rupture and damage during use

sanitary performance includes evaporation residue (acetic acid, ethanol, n-hexane), potassium permanganate consumption, heavy metals, decolorization test. Evaporation residue reflects the possibility of separating residues and heavy metals when food packaging bags encounter vinegar, wine, oil and other liquids during use. Residues and heavy metals will adversely affect the human health of stratolaunch, which is 238 feet from nose to tail. In addition, residues will directly affect the color, aroma, taste and other edible quality of food

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