Industrial gases also have more applications in the food, especially in the packaging. It can prevent food oxidation deterioration, and play a role in retaining freshness. We will specifically explain this aspect of knowledge in this article, so that everyone can have a certain understanding of the food industry, because it is closely related to our life.
1.Quick frozen snacks
Using the liquid nitrogen deep cooling freezing technology can freeze the storage of aquatic products, so that aquatic products can meet the national first grade freshness standard. Under -32 ℃, the freezing temperature can be stored for a long time, and the quality can be maintained for a long time.
For natural drying or artificial drying of peanuts, tea, milk powder, potato chips and other food, fill in with nitrogen after pumping the vacuum. The oxygen content can be controlled, so as to prevent the discolour, reverting or deteriorating.
Fill in with the food grade carbon dioxide into the modified atmosphere packaging, the proportioning is from 40 % to 60 %. It can inhibit the oxidation effect, prevent the growth and reproduction of bacteria, microorganisms or mold, so as to prevent food milden and rot.
4.Fish, meat and garden stuff
For this kind of food, it not only needs to prevent the decay, but also needs to keep fresh, and microorganisms or bacteria are easy to breed and grow in this kind of food, so we need to fill a certain proportion of mixed gas to achieve the above purpose. Generally the mixture of carbon dioxide and oxygen is used.
For fresh meat, the carbon dioxide accounts for 20 % - 35 % and the oxygen accounts for 40 % - 70 %. For seafood, carbon dioxide accounts for 20 % and the oxygen accounts for 60 % - 80 %. For fruits and vegetables, carbon dioxide accounts for 1.35 % - 3.65 % and the oxygen accounts for 12.5 % - 17.5 %.
Carbon dioxide is usually used because its preservation effect is very effective.
Neutral nitrogen is usually used because it can maintain the beer's physical and chemical indexes better than the acid carbon dioxide, and liquid nitrogen is 30 % less than carbon dioxide in the production cost.
Nitrogen bubbles are injected into the water to reduce the oxygen content in the water, and the bubbles produce a concentration gradient, forcing the dissolved oxygen to spread.
7.Fruit beverage can
In general, it is filled with liquid nitrogen. On the one hand, it can exclude the air in the can. On the other hand, it can also reduce the thickness of the can wall and extend the quality guarantee period. And it is conducive to storage.http://www.wxytgas.com/