... Function:High obstruction,anti oxygenation,air tightness,easy to heat seal with pvc sheet,protect to be imitation and againest the light ... improve packaging grades,and to extend product shelf life.5.PVC/PVDC, PVC/PE/PVDC Composite sheetSpec:withd:<=1000mm,thickness:0.06 ... 500mm(according to different requirement)Functions:High,easy to hot seal with PTP aluminum,air tightness,clearable,cost is lower than ...