Corrugated fiberboard or "combined board" has two main components: the liner and the
medium. Both are made of a special kind of heavy paper called container board. Linerboard is
the flat facing that adheres to the medium. The medium is the wavy, fluted paper in between
One medium is glued to one flat sheet of Linerboard
The medium is between two sheets of linerboard. Also know as Double Face.
Three sheets of linerboard with two mediums in between.
Four sheets of linerboard with three mediums in between.