Aluminum foil as a metal material, non-toxic, tasteless, has excellent conductivity and light shielding property, high moisture resistance, gas barrier properties, its barrier properties of any other polymer materials and the deposition film can not match and can not be replaced of

Perhaps it is because aluminum is completely different from the metal material of plastic, and its performance and features are not many people know, and even a lot of misunderstanding. One view is that the barrier properties such as aluminum foil and plastic composite of barrier properties equal to the simple sum of the barrier properties of pure aluminum foil and plastic film, which is wrong, because the simple superposition principle precondition is that two layers of material each microscopic uniform, concentration diffusion material on the uniform interface, the direction of diffusion along the interface does not exist.

Aluminum composite materials do not meet these conditions, aluminum composite diffusion pinhole position was significantly higher than other locations. There is also another view that gas permeability foil composite material is equal to the air permeability of plastic material multiplied by the ratio of the area of aluminum foil pinhole, the same is wrong, because it is not simply part of the nearby aluminum foil pinhole breathable plastic, aluminum foil pinhole plastic is also involved in air.

Aluminum composite materials do not meet these conditions, aluminum composite diffusion pinhole position was significantly higher than other locations. There is also another view that gas permeability foil composite material is equal to the air permeability of plastic material multiplied by the ratio of the area of aluminum foil pinhole, the same is wrong, because it is not simply part of the nearby aluminum foil pinhole breathable plastic, aluminum foil pinhole plastic is also involved in air.

In fact, as a package, factors that affect the sealing performance of a positive penetration, side penetration and leakage, high barrier materials can only say that there is a very low penetration, does not mean that there is a very low side penetration and leakage. And aluminum foil composite packaging materials in the molding, filling, sealing and other packaging processes and packaging products sterilization, transportation and sales process, the aluminum foil layer may be pressure to wear, pressure off, fracture, and the overall performance of the package seal is affected.