Flex barrier and optical density (OD) are two unique properties for metallized films and aluminum foil. This study investigated the effect of flexing on barrier properties of a laminate comprising metallized films and aluminum foil, as well as OD and adhesive lamination process on the overall multilayer laminate performance. Three (3) barrier layers, namely aluminum foil, metallized polyethylene terephthalate (met OPET) film with a high OD, and standard metallized PET film(met OPET), were laminated with the same printing layer OPET and sealing layer linear low density polyethylene (LLDPE), into OPET/adhesive/foil/adhesive/LLDPE and OPET/adhesive/met OPET/adhesive/LLDPE structures. The oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) were measured before and after flexing. The aluminum foil centered laminate had an excellent oxygen barrier after the 20-cycle flexing test and failed to retain its oxygen barrier after the 270-cycle flexing. Compared to the aluminum foil centered laminate, the metallized film centered laminates were less affected by the flexing on the oxygen barrier. For all laminates, the water vapor barrier was less severely affected by flexing than the oxygen barrier. This study suggests that the ASTMF392 Gelbo D (20- cycle flexing) can determine if aluminum foil and metallized film centered laminates are resistant to flex-formed pinhole failures. A higher OD, a thicker film thickness and lamination process improved laminate’s actual barrier, resulting in lower measured transmission rates versus that predicted using Henry's solubility law and Fick's diffusion law. The laminate’s water vapor transmission rate is 55–74% lower than predicted. The oxygen transmission rate is 15–31% lower than predicted.

挠性阻挡层和光密度（OD）是金属化膜和铝箔的两个独特属性。这项研究调查了挠曲对包含金属化膜和铝箔的层压板的阻隔性能的影响，以及OD和粘合剂层压工艺对多层层压板整体性能的影响。三层（3）阻隔层，即铝箔，具有高OD的金属化聚对苯二甲酸乙二酯（met OPET）膜和标准金属化PET膜（met OPET），与相同的印刷层OPET和密封层线性低密度聚乙烯（ LLDPE），分为OPET /胶粘剂/箔/胶粘剂/ LLDPE和OPET /胶粘剂/ met OPET /胶粘剂/ LLDPE结构。在弯曲之前和之后测量氧气透过率（OTR）和水蒸气透过率（WVTR）。以铝箔为中心的层压板在20圈屈曲试验后具有出色的阻氧性，在270圈屈曲后未能保留其阻氧性。与以铝箔为中心的层压板相比，以金属化膜为中心的层压板受阻氧层挠曲的影响较小。对于所有层压板，水蒸气阻隔层受弯曲的影响均不如氧气阻隔层。这项研究表明，ASTMF392 Gelbo D（20周期弯曲）可以确定铝箔和以金属化膜为中心的层压板是否能够抵抗弯曲形成的针孔破坏。较高的OD，较厚的膜厚度和层压工艺可改善层压板的实际阻隔性，从而导致测量的透射率低于使用Henry溶解度定律和Fick扩散定律预测的透射率。层压板的水蒸气透过率比预期的低55-74％。氧气透过率比预期的低15–31％。