How to identify gases in food packaging bags

Food packaging bags in addition to vacuum packaging, are basically bulging, are filled with gas. So how do we discern what gas inside? These gases is how to get in at the same time, played a what kind of role? Small make up today to summarize. Needed to distinguish method of gas inside the food packaging tools: 2 bags, food bags sample clean cylinder 1 root, pure limewater ( Calcium hydroxide) 1 cup, 1 root candles, lighter one. First, look for a needle tube, exhaust gas, and then insert the inside of the bag will smoke gas into the cylinder, and then the gas into lime water, if the limewater turbidity of gas in the bag is considerably in carbon dioxide. If there is no obvious side turbidity on to the next step. Second, to take another gases in food packaging bags, lit the candles. Over the side of the flame slowly out of gas, if the flame burn, is the inside of the gas oxygen; If a weakening the flame extinguished, the inside of the gas is nitrogen; If no obvious change, the gas is air inside. How to filling the other gas in food packaging bags in the air, after filling the direct heat sealing is food. If the gas is gas inside the bag, it is through the following methods: 1, take out the air in the bag, vacuum to the expected. 2, nitrogen, carbon dioxide, oxygen in the cylinder filling the bags, because these gases are higher than the density of air, not so fast dissipation. 3, after reaching filling amount, fast heat sealing, the gas seal in the bag. Food packaging bags inside the gas filling the role in general, food sack filling the gas is nitrogen, nitrogen dioxide, oxygen, three. Filling the nitrogen in the food packaging is filling effect, prevent food react with oxygen, but also protection products are crushed. Nitrogen is inert gas, it is difficult to react with food. Molecule is bigger, not easy to overflow, oxygen molecules are hard to enter the sack. We usually see puffed food and baking pastry food, such as potato chips, French fries, they are filling the packing bag of basic nitrogen. Food sack filling the carbon dioxide, but slightly soluble in fats and water, weak acid carbonate formation, corruption can be prefabricated mould, the activity of bacteria and other microorganisms. An oxygen supply is prefabricated anaerobic bacteria growth, keep the food fresh, such as fresh vegetables, fruits, meat, etc. For now, most food packaging applications is filled with nitrogen, the inert, many products can be a very good protection. And they are colorless, odorless, won't react with food, more convenient to control and broke open the packing bag there will be no pungent smell.
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