The number of steps and motions required in the packing process were reduced in the 1950s with the development of vertical form-fill-seal packaging machinery that allowed the bag to be shaped, filled, and sealed before being fully inserted into the carton. This method has occasionally—or perhaps frequently—experienced bag jams because awkwardly shaped or heavily loaded bags were difficult to place into the boxes. The development of tools that gave the bags a precise rectangular shape, which made it easier to drop them into the carton, was one way to address this issue.
The parts of a liquid Bag in Box Packaging consist of an exterior protective cardboard carton, a flexible and foldable inner bag often constructed from a synthetic film, a spout attached to the inner bag to conveniently pour desired amounts of the liquid. The industrial bulk milk dispensers and the sulfuric acid used as an activator for dry-cell batteries were the earliest applications for the liquid Bag in Box Packaging container. The most widely used barrier film today is a three-ply film made of two layers of ethylene-vinyl acetate and one layer of metallized polyester. The inner bag, also known as a barrier film, is typically made from metallized thermoplastic materials (such as polyethylene and/or polyvinylidene chloride).
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