Combined board
The finished corrugated sheet: one or more fluted mediums glued between flat liners.
In practice
Single wall has one medium and two liners, double wall two mediums and three liners, triple wall three and four.
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Related terms
- Single wall
- Combined board with one fluted medium between two liners.
- Double wall
- Combined board with two fluted mediums and three liners.
- Triple wall
- Combined board with three fluted mediums and four liners, used for bulk bins and heavy loads.
- Linerboard
- The flat paper glued to each face of the fluted medium.
- Medium
- The paper that is fluted on the corrugator and sits between the liners.
- Basis weight
- The weight of a fixed area of paper, in the US usually pounds per thousand square feet (lb/MSF).
Definitions written by Packgent, last reviewed 2026-10-27. All terms.