The reason why food packaging bags are prevailing in the market today is that they are a very important part of the food industry, and it can even be said that they are indispensable in the food industry, and are indispensable in people's daily lives. The quality of a food packaging bag can directly affect the product, and it is accompanied throughout the entire process of food production, circulation and use. So how to judge whether the food packaging bag is qualified? Xinmin offers a few points for you to judge:
1. The appearance of the food vacuum bag must not have defects such as air bubbles, perforations, water marks, gluten, poor plasticization, fish-eye stiffness and other obstacles that hinder use. The specification width, length, and thickness deviation should all be within the specified deviation range.
2. In the process of making food packaging bags, the physical and mechanical properties include tensile strength and elongation at break. It reflects the product's ability to withstand stretching during use. If this item is unqualified, the food packaging bag ( Membrane) is prone to cracking and damage.
3. Hygienic performance includes evaporation residue (acetic acid, ethanol, n-hexane), consumption of potassium permanganate, heavy metals, decolorization test. Evaporation residue is a reflection of the possibility of residues and heavy metals being precipitated when the food packaging bag encounters liquids such as vinegar, wine and oil during use. Residues and heavy metals will adversely affect human health. In addition, residues will directly affect the color and aroma of food. , Flavor and other food quality. Therefore, companies that customize food packaging bags must conduct on-site inspections of manufacturers to ensure safety and health before placing orders.
4. Degradation performance According to the degradation type of the product, it can be divided into photodegradation, biodegradation and environmental degradation. The 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 (film) will break, differentiate and degrade under the joint action of light and microorganisms, and eventually become debris, which is a natural environment. Accepted; if the degradability is not good, it will not be accepted by the environment, thus forming "white pollution".