The structure formed on a corrugator by gluing one or more sheets of fluted containerboard (medium) to one of more sheets of flat containerboard (linerboard).
There are four common types:
- Singleface: Combination of one fluted corrugating Medium glued to one flat sheet of linerboard.
- Singlewall: Two sheets of linerboard, one glued to each side of a fluted medium. Also known as Double Face.
- Doublewall: Three sheets of linerboard, with two interleaved and glued corrugated mediums.
- Triplewall: Four flat sheets of linerboard, with three interleaved and glued corrugated mediums.
