What material is the surface of the packing bag such as instant noodles, pickled mustard tuber, small bread and so on? Why should we add this layer?
First, it is easy to heat seal, otherwise only aluminum foil can not be sealed;Two, high barrier plastic film preservation effect is also very good, can increase its number of layers, reduce aluminum foil thickness, thereby reducing costs
Aluminum filmThe first consideration of food packaging is the barrier properties of packaging materialsBecause barrier property is good, the preservation time is long, the shelf life is long, the quality can guarantee betterAt present, all food packaging materials, aluminum foil barrier is the best (followed by some high polymer plastics, like EVOH, PVDC, etc.)Therefore, the most common, always in the middle of two layers of plastic film, a layer of aluminum foil, to improve barrier,But why not use aluminum foil packaging alone, but also two or more layers of plastic film?,
