Converters of flexible barrier packaging operate by a simple idea: if a monolayer material can’t provide the barrier, go with a multilayer material. Depending on the need, barrier properties protect against the entry or the exit of elements. The way to describe a multilayer material is from-outermost-to-innermost. Each layer serves a function. The following three examples illustrate that point.
Our first example is paper/polyethylene/foil/polyethylene. The paper provides a printing surface. The foil provides the barrier. The first polyethylene bonds paper and foil, and the second polyethylene is for heat sealing. Applications include bags and pouches for powders and other dry goods.
