Corrugated cardboard

There are many types of corrugated cardboards, each with different technical specification. 

Corrugated cardboard sheet structure:

Cross section

A – flute heightB – distance between flute peaks

Cardboard is divided depending on the number of flutes it is made of. We offer the following types of cardboard:

2-ply cardboard

B, C, E flute

3-ply cardboard

E flute (microflute), flute height: ca. 2 mm
B flute, flute height: ca. 2.5-3 mm
C flute, flute height: ca. 3-4 mm

5-ply cardboard

Mixed EB flute, flute height: ca. 5 mm
Mixed BC flute, flute height: ca. 6-7 mm
Mixed EE flute, flute height: ca. 3-4 mm

7-ply cardboard

Mixed BCC or BBC flute, flute height: ca. 10 mm

Corrugated cardboard is made of various types of paper which determine the quality and strength.

Basic types of paper:

- recycled paper
- testliner (cardboard with greater strength with recycled paper addition only)
- kraftliner (cardboard for direct contact with food)

Another important factor to be borne in mind when choosing cardboard is its density.

For 3-ply cardboards, densities of 240 g/m2 up to 600 g/m2 are used and for 5-ply cardboard densities from 570 g/m2 to ca. 1500 g/m2.

It must be noted that cardboard with high flutes has better elasticity and greater rigidity (packaging provide better protection for contents).

On the other hand, cardboard with low flutes has much better flat crush resistance, making it more resistant to impact or puncture (and more suitable for print). 

Another factor to be considered is the colour. As a standard, packaging are made of brown cardboard, commonly referred to as grey cardboard. However, bleached cardboard is also used.

Haber 2015