The reason why food packaging bags are popular in the market today is that they are a very important part of the food industry, and can even be said to be indispensable in the food industry. They are essential items that people cannot do without in their daily lives. The quality of a food packaging bag can directly affect the product, and it accompanies the entire process of food production, circulation, and use. Today, Jiangsu Shenkai Packaging will briefly introduce how to judge whether a food packaging bag is qualified from four aspects.
1. The appearance must not have defects such as bubbles, perforations, water marks, bulging, poor plasticization, and fish eye stiffness that hinder use. The deviation of specification width, length, and thickness should be within the specified deviation range.
2. The physical and mechanical properties include tensile strength and elongation at break, which reflect the product's ability to withstand tension during use. If this item is not qualified, food packaging bags (films) are prone to cracking and damage during use.
3. The hygiene performance includes evaporation residue (acetic acid, ethanol, n-hexane), potassium permanganate consumption, heavy metals, and decolorization test. Evaporation residue reflects the possibility of food packaging bags precipitating residues and heavy metals when encountering liquids such as vinegar, wine, and oil during use. Residues and heavy metals can have adverse effects on human health. In addition, residues can directly affect the color, aroma, taste, and other edible quality of food.
4. The degradation performance can be divided into photodegradation type, biodegradation type, and environmental degradation type according to the different degradation types of the product. The degradation performance reflects the ability of a product to be accepted by the environment after being discarded. If the degradation performance is good, the bag (film) will break, differentiate, and degrade on its own under the joint action of light and microorganisms, ultimately becoming debris and accepted by the natural environment; If the biodegradability is poor, it will not be accepted by the environment, resulting in "white pollution".
