Corrugated board and ply: Corrugated board is made of flat liners glued to wavy flutes. "Ply" counts the layers: 3-ply has two liners and one flute.
In more detail
3-ply suits light retail packs; 5-ply and 7-ply add flutes and liners for heavier or export loads.
Why it matters
Choosing the right ply and grades avoids both crushed boxes and over-specified cost.
How it is measured or specified
Specified by ply, flute profile and the grades of each layer; validated by box compression or burst tests.
Questions
What is Corrugated board and ply?
Corrugated board is made of flat liners glued to wavy flutes. "Ply" counts the layers: 3-ply has two liners and one flute.
Why does Corrugated board and ply matter to buyers?
Choosing the right ply and grades avoids both crushed boxes and over-specified cost.
Why does Corrugated board and ply matter?
Choosing the right ply and grades avoids both crushed boxes and over-specified cost.
Explain Corrugated board and ply in more detail.
3-ply suits light retail packs; 5-ply and 7-ply add flutes and liners for heavier or export loads.
How is Corrugated board and ply measured or specified?
Specified by ply, flute profile and the grades of each layer; validated by box compression or burst tests.
What is Kraft liner?
Kraft liner is the strong board used for the flat outer and inner faces of corrugated board.
What is Box compression test?
BCT is the load a box can bear before it buckles. It is the most useful single number for how high boxes can be stacked.
What is Burst factor?
Burst factor is the bursting strength of paper divided by its grammage. It lets buyers compare the strength of grades of different weights.