1, PE (polyethylene) film colorless, odorless, slightly milky white appearance, non-polar surface, difficult to print and bond, must be surface treatment to improve printing and bonding.
2, PE film permeability is less than 0.01%, water resistance is good, but the gas permeability is large, suitable for moisture-proof packaging, not suitable for vacuum packaging. It has a waxy feel, is flammable, and has low smoke when burned. It has a drop of molten drops, and the flame is yellowish and blue, and smells of paraffin.
3, PE film tensile strength is low, creep resistance is not good, and impact resistance is better.
4, PE is a chemically inert polymer, has good chemical stability, can withstand the corrosion of acid, alkali, salt solvents at room temperature.
The temperature is below 60 ° C and is insoluble in common solvents, but long-term exposure to fat and aromatic solvents may swell or crack. If the temperature exceeds 60 ° C, it can be dissolved in a small amount in toluene, amyl acetate, triethylene, turpentine, mineral oil and paraffin. After exceeding 100 ° C, it is soluble in tetralin. When the PE film is exposed to vegetable oil, it will also swell, penetrate, and discolor. The long-term contact will also cause the intrinsic naphthalene to be dissolved in the vegetable oil.
In this way, the shelf life of foods containing vegetable oil is greatly shortened, which is also harmful to human health. Therefore, PE film should not be used to package fried foods and foods containing vegetable oil.
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