Multilayer method: the addition of the plastic film was the first step to help make brick containers impermeable to liquids and heat-sealable. Within the sixties, an aluminum foil started to be added to your cardboard container to be sure much better security and lengthen the shelf lifetime of the packaged https://share.evernote.com/note/1e40625b-121b-7870-eb2e-73c5cd5384a6