Types of Corrugated Cardboard
The definition states that “corrugated cardboard is a cardboard made from one or more layers of a fluted corrugated sheet which are glued between several layers of other paper or cardboard”. Alongside this definition exists the fluting board glued onto a single liner, this is also called “one-sided corrugated cardboard”.
The functionality of the corrugated fibreboard is provided by the shape of the fluting sheet. There is a distinction between the wavy and V-shaped fluting, with the former prevailing in use.
The type of corrugated fibreboard is defined by two dimensions:
- fluting pitch (t)
- fluting height (h)
As per the DIN 5468 standard, fluting is classified by dimensions as below:
|Type||Symbol||Pitch [mm]||Height [mm]|
|Extra coarse flute||K||5,0||10|
|Coarse flute||A||8,0 - 9,5||4,0 - 3,9|
|Medium flute||C||6,8 - 7,9||3,1 - 3,9|
|Fine flute||B||5,6 - 6,5||2,2 - 3,0|
|Midi flute||D||3,8 - 4,8||1,9 - 2,1|
|Micro flute||E||3,0 - 3,5||1,0 - 1,8|
|Mini flute||F||1,9 - 2,6||0,6 - 0,8|
|Extra mini flute||G||1,8||0,55|
This is the oldest flute size and it delivers a very good dampening effect. In practice, it is very often used in the most durable types, usually as a component of the 7-layer CAA cardboard.
Smaller in dimension than the A flute, it is the most frequently used flute size and has very good universal properties. This type is also used in so-called heavy-duty 7-layer cardboards.
B - flute
This is used for less sensitive or self-supporting packaged products. It is frequently applied in combination with the C flute in 5-layer BC fibreboard, which is used especially in industrial packaging.
E - flute
Also known as “micro flute”, this is used in small-dimension packaging materials and in any application where the packaging is to bear quality print. This feature leads to its frequent use in combination with the B flute. The EB-flute provides good physical properties and is sufficiently smooth and straight for quality flexographic print
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