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Corrugated board

Corrugated board usually consists of outer flat sheets (also called "liners") of puncture-resistant paper, sandwiching a central filling of corrugated short-fibre paper. This fluted paper coat (or "medium") resists crushing under compression and gives cushioning protection to the box's contents.

The "liner" and "medium" are glued together along the outsides of the peaks and valleys of each flute, normally using starch adhesives. The starch is derived from corn, wheat or potato. The board is fully recyclable and can be pulped down to make more paper for more board once its service life is over.

The board has high end-to-end strength along the corrugated flutes, so the box is normally designed with the flutes running vertically for stacking strength.