Multilayer system: the addition of the plastic film was the initial step for making brick containers impermeable to liquids and warmth-sealable. Inside the 1960s, an aluminum foil started to be extra into the cardboard container to be certain greater safety and increase the shelf life of the packaged merchandise. Taking https://share.evernote.com/note/a33f5123-cae0-0d4e-0d4f-ed5a266a57f8