Vacuum bag also called vacuum packaging, is based on the principle of atmospheric pressure, the main purpose of the vacuum bag is oxygen, to help prevent food mildew deterioration.
Vacuum packaging is put inside the bag and food of oxygen in cells with pump smoke, lose the microbial process of 'living environment'.
Food vacuum bag also prevent oxidation, make food not stale, metamorphic to reduce the loss of vitamins A and C.
vacuum packaging materials commonly used double composite thin film or three-layer aluminum composite membrane made of three seal bag.
Vacuum packaging machine commonly used outside the cavity and pump type two kinds of models.
Our vacuum packing technology is developed in the early eighty s, and vacuum packaging technology in the early ninety s began to use.
after vacuum packaging is pumping vacuum, and filling the nitrogen, carbon dioxide and other gases.
Nitrogen is inert, filling effect, make the vacuum bag to keep positive pressure, in order to prevent the outside air into the bag, bag of food plays a protective role.
Carbon dioxide, corruption has inhibitory activity role of bacteria and other microorganisms.
There are food such as crisp fragile, easy to deformation and oil food, there are sharp edges or high hardness will puncture the vacuum bag and so on food, after vacuum packaging, vacuum bag inside air pressure is greater than the atmospheric pressure outside packing bag, can effectively prevent food compression breakage, deformation, and does not affect the packaging and printing packaging appearance.
As the vacuum bag packaging promotion and the development of the supermarket, its scope of application will be more and more widely, some will gradually replace rigid package.
Vacuum deaeration besides inhibiting microbial growth and reproduction, another important function is to prevent the oxidation of the food, because the oil kind food contains a lot of unsaturated fatty acid, by the effect of oxygen oxidation, sour food, deterioration.
In addition, the oxidation also make vitamin A and vitamin C loss, food pigment in the volatile substances by the role of oxygen, make the color darker.
So oxygen can effectively prevent food spoilage, maintain its color, aroma, taste and nutritional value.
what vacuum bag 'magic' keep food meimei?
as the name suggests, the vacuum bag is to make the bag to maintain a relatively high degree of stress state, the air in the vacuum bag is wrapped all take out seal, air rare equivalent to low oxygen effect, make no survival conditions, so as to achieve preservation, the purpose of reducing bacterial growth.
when the common vacuum bag in vacuum prone to dead Angle, caused by vacuum is not complete, not well extend the shelf life, and our family and the raising of the package is grain pressure vacuum bag, in vacuum, can form microchannel, vacuum is relatively complete, so as to achieve the effect that effectively extend the shelf life of food.
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