1, the appearance must not be hindered by the use of bubbles, perforation, tattoo, tendons, poor plasticizing, fish eye stiff block and other defects.
Specification width, length, thickness deviation should be within the specified deviation range.
2, physical and mechanical properties include tensile strength, elongation at break, it is to reflect the product in the use of the ability to withstand stretching, if this is not qualified, in the use of food packaging bags (membranes) are prone to rupture, damage phenomenon.
3, sanitary properties include evaporation residue (acetic acid, ethanol, n-hexane), potassium permanganate consumption, heavy metals, decolorization test.
Evaporation residue is a reflection of food packaging bags in the use of vinegar, wine, oil and other liquids when the possibility of precipitation residue, heavy metals, residues and heavy metals will have adverse effects on human health, in addition to the residue will directly affect the color of food, fragrance, taste and other edible quality.
4, the degradation performance according to the product degradation type is different, can be divided into photodegradation type, biodegradable type, environmental degradation type.
Degradation performance is to reflect the product after the use of waste by the environment to accept the ability, if the degradation performance is good, the bag (membrane) will be under the joint action of light and microorganisms, self-fracture, differentiation and degradation, and eventually become debris, for the natural environment to accept;
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