经过拉伸取向结晶后的PET薄膜氧气透过率获得下降，改善了阻隔性能。
PET film oxygen permeance ratio is dropped after crystallization through drawing tropism, modified the barrier performance.
译文：氧气透过量(PO2)：氧气透过率与薄膜两侧的氧气分压差的比值。
Oxygen Permeance (PO2) : the ratio of the O2GTR to the difference between the partial pressure of O2 on the two sides of the film.
氧气透过率（O2GTR）：在试验条件下，在单位时间内透过单位面积试样的氧气数量。
Oxygen Transmission Rate (O2GTR): The quantity of oxygen gas passing through a unit area of the parallel surfaces of a plastic film per unit time under the conditions of test.
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