FACTS TO KNOW ABOUT CORRUGATED
This versatile shipping material is constructed with two components:
- The flat paper on either side of the board is called linerboard.
- The fluted paper interior is called medium.
Corrugated board can be constructed as single wall, double wall, or triple wall:
- Singlewall: The corrugated medium is glued between two sheets of linerboard—also known as Doubleface
- Doublewall: Three sheets of linerboard with two mediums in between
- Triplewall: Four sheets of linerboard with three mediums in between
The flutes form the arch component of a corrugated box. They work using the architectural principle that heavy loads are more efficiently supported by using an arch.
By experimenting with flute profiles, designers can vary compression strength, printing surfaces, cushioning strength, and thickness. Generally, large flutes provide greater vertical strength and cushioning. Smaller flutes enhance graphic capabilities while providing more structural integrity than flat board alone. Different flute profiles can be combined to meet exact specifications without “over production”.
The industry standard is to use the inside dimensions of a box to represent the box size.
STANDARD U.S. CORRUGATED FLUTES
|FLUTE DESIGNATION||FLUTE PER LINEAR FOOT||FLUTE THICKNESS/CROSS SECTION|
|A||33 +/- 3||3/16″|
|B||47 +/- 3||1/8″|
|C||39 +/- 3||5/32″|
|E||90 +/- 4||1/16″|