Corrugated board grades explained: types of cardboard

Find out more about the key component of your corrugated packaging &#; and how it influences everything from packaging costs to performance

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If you are using high volumes of packaging, chances are you will be familiar with corrugated cardboard.

If you don&#;t, it is impossible to go about everyday life without being exposed to cardboard at some point.

However, do you know the elements that determine how strong &#; or how expensive &#; corrugated cardboard is? What is it manufactured from? And what impact can this have on the success of your packaging?

This guide aims to explain and clarify everything you could need to know about cardboard.

From flutes to gsm, liners to the number of walls, everything is explained.

The following production tolerances are to be taken into consideration:

Quantity tolerance for paper
± 3% however a minimum of ± 5 sheets per sales unit

Quantity tolerance for board, corrugated board
± 3%

Quantity tolerance for enclosures, folders, boxes
± 8%

Weight (grammage) tolerance
± 7%

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Thickness (calliper) tolerance
Paper and board up to 300 gsm ± 10%
Board > 300 gsm ± 5%
Corrugated board ± 8%

Dimensional (size) tolerance for paper and board material
Sizes with plus tolerance max. ± 7 mm
Cutting tolerance 4-sided angular cut ± 2 mm

Dimensional (size) tolerance for corrugated board
Cutting tolerance ± 3 mm

Dimensional tolerance for reeled paper
Roll width ± 5 mm, running metres ± 3%

Dimensional (size) tolerance for enclosures, folders, boxes
Plus tolerance up to 5%

Dimensional (size) tolerance for envelope enclosures
Angle tolerance ± 2 mm, size tolerance ± 3 mm

Dimensional (size) tolerance for tubes
Diameter and tube wall thickness ± 0.3 mm,
lengths ± 10 mm

Perpendicularity tolerance in the case of cuttings with 4-sided angular cut
Angle tolerance 0,6% however a minimum of 3 mm
for 1 m length

Planarity tolerance for corrugated board
Planarity (flatness) tolerance ± 15 mm for 1 m length

Spots (fibre residues and pulp impurities)
Spots with a diameter of less than 0.4 mm are considered insignificant. Mounting board standard specifications stipulate that maximum two spots up to 0.9 mm in diameter each are acceptable per m²

pH tolerance
± 0.5 variation on the pH scale (pH 7.0, pH 6.5 and 7.5 are also permitted)

Deviating tolerances are to be agreed upon separately.

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