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and humidity,but apotential problem inorganic coating is brittle relatively large,easy to breaklarge deformation.On the PET bottle has two specific methods were applied SiOxphysical vapor deposition method(PVD method)and chemical vapor deposition method(CVD method),which deal with the barrier effect than the PVD method by CVD.TetraPak has developed Glaskin technology.Vacuum deposition process,a layer of glassmay be formed of silicon oxide barrier coating on the inner surface of the PETbottle.Its oxygen and carbon dioxide barrier properties is extremely high,andbeer contacts inert,will not affect the original flavor,the longest shelf life ofup.