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Low-density PE bags are moisture-permeable, The air permeability is larger, and the high-density PE bag is smaller.
The advantages of PE bags are economy, cheapness, and good moisture resistance.
It is best to use polyethylene bags to add a layer of external packaging that can block light and have low air permeability, such as synthetic paper cans, iron cans, etc.
In the early days, they were mainly used for the outer packaging of tea bags with PE bags .
Synthetic paper cans Synthetic paper cans are currently the most widely used packaging materials.
Only air and moisture permeability are still high, and it is not suitable to be used alone.
