07/10/2026
〰️ Why are corrugated flute profiles identified by letters?
As board structures evolved, the industry needed a shared way to describe different internal geometries.
Profiles such as A, B, C, and E distinguish variations in flute height, pitch, frequency, and paper take-up. These parameters contribute to thickness, stiffness, cushioning, surface quality, and converting behaviour.
The letters are not a quality ranking.
They are a technical language for describing what lies between the liners.