Why can filling the bag with nitrogen prevent the food from moisture or deformation?

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puffed food and edible oil are generally filled with nitrogen as protective gas, mainly because nitrogen is an inert gas for food, which can avoid the oxidation of packaging contents by oxygen. Moreover, nitrogen is easy to obtain, low-cost and stable. It is very suitable to be used as a protective gas for food

in addition, filling the expanded food packaging bag with nitrogen can also play a buffer role to prevent the contents from being damaged during transportation or storage and affect the normal sales

nitrogen, with the chemical formula of N2, is usually a colorless and tasteless gas, and generally nitrogen has a lower density than air. Nitrogen accounts for 78.08% (volume fraction) of the total atmosphere and is one of the main components of air. Under standard atmospheric pressure, when nitrogen is cooled to – 195.8 ℃, it becomes colorless liquid. When it is cooled to – 209.8 ℃, liquid nitrogen becomes snow like solid. Nitrogen is chemically inactive and difficult to react with other substances at room temperature, so it is often used to make preservatives. However, under the condition of high temperature and high energy, it can change chemically with some substances to make new substances useful to human beings

other uses

due to the chemical inertia of nitrogen, it is often used as protective gas, such as filling and inflation of melons and fruits, food and light bulbs. In order to prevent some objects from being oxidized by oxygen when exposed to air, filling the granary with nitrogen can prevent the grain from mildew and germination and keep it for a long time. Liquid nitrogen can also be used as deep refrigerant

as a refrigerant, it is often used in the surgery of removing spots, bags, beans, etc. in the hospital, that is, the spots, bags, beans, etc. are frozen, but scars are easy to appear, so it is not recommended to use. High purity nitrogen is used as carrier gas for chromatograph and other instruments. Used as shielding gas for bright annealing of copper tubes. It is used as laser gas of laser cutting machine together with high-purity helium and high-purity carbon dioxide

nitrogen is also used as a protective gas for food preservation. In the chemical industry, nitrogen is mainly used as protective gas, replacement gas, washing gas and safety guarantee gas. It is used as protective gas for aluminum products, aluminum profile processing, aluminum thin rolling and so on

used as shielding gas for reflow welding and wave soldering to improve welding quality. It is used as a protective gas in the production of float glass to prevent tin bath oxidation

puffed food and edible oil are generally filled with nitrogen as protective gas, mainly because nitrogen is an inert gas for food, which can avoid the oxidation of packaging contents by oxygen. Moreover, nitrogen is easy to obtain, low-cost and stable. It is very suitable to be used as a protective gas for food.

because the pressure in the packing bag is consistent, the food will not deform

this is mainly because nitrogen can keep food fresh for a long time

nitrogen can keep food fresh for a long time

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