Vacuum packing
A vacuum packaging is a gas-tight packaging of a product in which the gaps and thus reactive gases within the product have been greatly reduced; it is also achieved that the most commonly used packaging film fits snugly. Above all, it is important that only a little oxygen remains in the packaging. The label " vacuum packed" is found on the products .
This type of packaging has several advantages. As with protective gas packaging , the products have a longer shelf life because only a small amount of residual oxygen reaches the product; larger amounts would make the products unusable over time due to chemical reactions or biological processes. In addition, the required volume is reduced to a minimum with vacuum packaging, which means that the products can be transported, for example, packed more tightly.
Foils made of polyamide or polyethylene and composite foils are used as gas-tight packaging material. Hard packs can also be found in stores. Vacuum packaging has now become indispensable for fresh meat packaging and food packaging.
In “vacuum packaging” there is usually only a slight negative pressure, a maximum of a rough vacuum ; the flexible plastic film is supported by the contents against the ambient air pressure. If the packaging is to withstand the ambient pressure independently, a thick-walled tin can or the like is necessary for a rough vacuum.
Individual evidence
- ↑ a b Vacuum packaging at Nabenhauer information products