Corrugated Board: Liners, Fluting and Wall Construction

Corrugated board is a paper-based structure made by bonding a corrugated, or fluted, paper layer to flat paper liners. Its defining feature is the wave-shaped layer, rather than simply a thick sheet of paper. A single-face construction has one liner; familiar single-wall board has a fluted layer between two liners. WPV construction description · DS Smith construction types

Linerboard and fluting medium

Linerboard forms the flat facing layers. Fluting medium, also called corrugating medium, is the paper formed into the waves. The waves themselves are the flutes. These names distinguish the component papers from the assembled board. FEFCO raw materials · DS Smith paper layers

Adhesive bonds the flute tips to the liners. FEFCO describes starch adhesive for this construction. The bonded assembly gives the papers a structural role together; the fluting creates a series of connected arches between the facings. FEFCO construction explanation

Single face, single wall and double wall

DS Smith lists these layer counts, while WPV describes one-, two- and three-wave constructions. Wall count therefore differs from total paper-layer count. The table covers common arrangements and is not an exhaustive list of every corrugated construction. DS Smith layer counts · WPV wave construction

Flute profile and wall count are different

A flute profile describes the wave shape or size. A wall designation describes the board assembly. Different paper grades and flute profiles can be combined within a construction, so “single wall” alone is not a complete material specification. FEFCO construction combinations · DS Smith profiles

For example, two hypothetical single-wall sheets both have three paper layers. That shared layer count does not establish equal packaging performance: their paper combinations and flute profiles can differ. This is an illustration of the naming distinction, not a measured comparison.

Board construction and packaging performance

Corrugated board is the material; a finished box also has a particular shape and construction. Identifying the board layers does not establish the load a finished package can carry. The scope here is component recognition, not a strength rating, transport approval or box-design calculation.

Use the paper packaging knowledge section for connected definitions as the library expands.