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packaging industry,has now become one of the major carbonatedbeverage containers.However,because beer is a kind of oxygen sensitive drinks,itis vulnerable to the entry of oxygen and carbon dioxide overflow and affect thetaste.This requires packaging material for oxygen and carbon dioxide gases havesufficient barrier properties.The barrier properties of pure PET plastic bottlescan not meet this requirement.Thereby increasing PET beer bottles barrierpackaging materials has become a key study.Chapter II infiltration mechanism2.1 Gas permeation mechanism in polymersBarrier polymer is a polymer of small molecular gases and liquids shielding[2].And ceramics,glass and metal material different from the polymer material is apolymer,the molecular weight of which is composed of a huge molecular chain,binding between the polymer chains far tight bond between the metal atom,there isa greater.