PEN (PolyEthylene Naphthalate), nylon and EVOH have a much higher barrier to oxygen than PET. They could be sandwiched between two PET layers.
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- PEN(PolyEthylene Naphthalate),尼龙及EVOH对氧气的阻融性较PET强,可用夹层的方法将它夹在外层及内层PET料之间。