After HPP(>400MPa),the physical damage of PP/Al/PE is evident,because the compress rate of aluminum foil was different from PP and PE,showing separation.

• 超高静压处理后，PP/Al/PE的物理损伤更为明显，原因亦是铝，铝箔与其他两种材料的压缩比相差较大，而表现为膜层的剥离。