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 Corrugated
shipping containers are now the largest packaging container
business. Corrugated boxes are used by virtually every
industry in the United States.
In addition to its use in the actual shipping containers,
corrugated board is also used for bracing and blocking.
Partitions inside boxes hold products in place or apart
from each other. Stacked sections act as cushions for
heavy products.
Corrugated board is formed by combining one layer of
paperboard, the medium, which is bent into a wave pattern,
with one liner (single face) or with two liners (double-faced
board). For greater strength, a second medium and face
layer or even a third can be added to make double or
triple-wall boards.
 Medium
and liner are generally unbleached kraft paper board
for maximum strength. However, if the cardboard is going
to be used as the primary retail package, one liner
may be of bleached fiber to enable custom printing.
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