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Corrugated Board

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 containerboard. Linerboard is the flat facing that adheres to the medium. The medium is the wavy, fluted paper in between the liners. Different flute profiles can be combined in one piece of combined board. For instance, in a triple wall board, one layer of medium might be A-flute while the other two layers might be C-flute. Mixing flute profiles in this way allows designers to manipulate the compression strength, cushioning strength and total thickness of the combined board.

Single Face: One medium is glued to one flat sheet of linerboard.

Single Wall: The medium is between two sheets of linerboard. Also known as Double Face.

Double Wall: Three sheets of linerboard with two mediums in between.

Triple Wall: Four sheets of linerboard with three mediums in between.