1. The three major gases in modified atmosphere packaging
The shelf life of food exposed to air is very limited, and the shelf life of fresh meat in ordinary air environment does not exceed three days. As far as modified atmosphere packaging is concerned, the three most commonly used replacement gases for fresh food are still nitrogen, oxygen and carbon dioxide.For example, if the bread-like food is required to be kept fresh for no less than 30 days, the modified atmosphere packaging machine can fill the package with carbon dioxide gas. When the food to be preserved is fresh fish and shrimp, the package of the modified atmosphere packaging machine can be filled with 30% nitrogen + 13% oxygen + 57% carbon dioxide, and the preservation period is generally about 15 to 30 days.
2. The application of CO2 in food packaging
High concentrations of CO2 have a strong inhibitory effect on molds and enzymes, and at the same time have a "poisonous" effect on aerobic bacteria, which can hinder the reproduction of microorganisms such as aerobic bacteria and molds, prolong the stagnation period and exponential growth period of microbial growth, and play an important role. Anti-corrosion and anti-mildew effect. For example, Bacillus sp., Aspergillus and Penicillium softening, when the concentration of carbon dioxide reaches about 10%, the reproduction rate of the three shows a significant downward trend. When the concentration reaches more than 30%, the reproduction rate of Bacillus sp. and Aspergillus sp. below 5%.3. Application of N2 in food packaging
Nitrogen dilutes the role of functional gases in modified atmosphere packaging because N2 itself will not directly inhibit the production and reproduction of microorganisms. N2 mainly plays two roles here:1. Fully reduce the residual oxygen inside the package.
2. Improve the appearance
CO2 is easily absorbed by the moisture and fat in the food, causing the whole package to collapse. Nitrogen can be used as a filler, so that the overall visual appearance of the sealed sales package is fuller, more beautiful and wider, so that it can be used faster in the sales process. Attract consumers' attention and generate purchasing desire, that is, to promote sales.
Tipack provides food-grade fresh-keeping packaging solutions for food producers and sellers, including heat shrinkable packaging ( Shrink Bag , Shrink Film , Plastic Casing Film, etc.), thermoforming packaging ( Thermoforming Film , MAP Trays, VSP Trays , PSP Tray, Fruit Cup, etc. ), and Plastic Sheets , Lidding Film, Skin Film , Vacuum Bag , Absorbent Pads, K Cup Coffee Capsule, Packaging Machine, etc.
1. The interior of the MAP is not an anaerobic environment, but it can be set very low.
2. CO2 has a time limit for the protection of fresh food, and the length of time depends on the quality of the packaging material and the ratio of CO2.
3. Fresh food using modified atmosphere packaging is more effective in a refrigerated environment.
