Corrugated flutes describe the structure of the material in the center (wave-shaped cardboard) that makes up the board’s corrugation. There are several different types of flutes, ranging from A to F.
A-Flutes: 36 Flutes/linear foot (The highest flute size).
B-Flutes: 49 Flutes/linear foot (Lower arch heights than “A”).
C-Flutes: 41 Flutes/linear foot (Split difference between “A” and “B”).
E-Flutes: 90 Flutes/linear foot (Greatest number of flutes/foot).
F-Flutes: 128 Flutes/linear foot (Most popular choice for corrugated).
These flutes evolved over time in response to changing manufacturing and distribution demands. The letter sequence refers to the sequence of development.
Triplewall consists of four liners separated by three mediums.