Is a mystery, why good food sack to hole?

On the market at present most of the food packaging can play porosity, may be some friends may wonder, why a good bag play hole? There is food packaging should not have good sealing can better protect the food? Small make up today to explain to everybody, everybody's understanding is not correct, but the stomatal not necessarily not seal, mainly for the following reasons to porosity. First, in order to convenient for the microwave. Many fresh food must pap, such as the small steamed bun, toast, etc. , during implantation after a period of time, to the customer hands, food cold already, must once again the microwave. In food packaging bags on a few small porosity, after heating, the packing bag is not easy to peng, make the heat more safe and convenient. This kind of food packaging can according to the mechanical equipment and laser 2 ways to porosity, immediately after hitting the porosity can be used to packing. Generally all is applied to the short shelf life of 1, 2 days of food packaging, or some of the food cold storage, is conducive to rapid refrigeration storage. Second, in order to convenient to one or several kinds of gas discharge after some food in the production and processing in packaging, such as ripening process, can cause some gases, such as gas for food storage quality is very bad, have to put it out, such as green coffee bean food. After this kind of food packaging must be played in a hole, a unilateral exhaust valve must be installed. The exhaust valve such as green coffee beans packing bag is only permissible carbon dioxide to escape from the bag other gases can't according to the exhaust valve into or out of the packaging bags. This kind of food packaging also belongs to a kind of intelligent packaging, common in some kind of gas discharge as soon as possible, must be sealing stored food and provisions.
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