Facts about containerboard grades and the possibilities for lightweighting. These things can help make your packaging solutions lighter, with a strength to rely on.
In our strive to make eco-friendly, lightweight containerboard components, we have studied and compared the different paper grades available on the market. Here's an overview based on CEPI's market definitions.
The expression virgin-based or fresh fibre containerboard, has traditionally been used for kraftliner and semi-chemical fluting.
Kraft paper is defined as “paper or paperboard whose fibre content has no less than 80% fibers obtained by the chemical sulfate or soda processes”. It is made with chemical pulp made from softwood and hardwood.
Semi-chemical fluting is divided into two subgrades, semi-chemical 1 and semi-chemical 2. Semi-chemical 1 is the strongest grade and generally contains more than 80% semi-chemical primary fibres. Using semi-chemical pulp generally leads to stronger components than when using recycled-based pulp.
However, there is now another fresh fibre based paper on the market, our new fresh fibre fluting medium Holmen INNR.
Source: CEPI, European list of corrugated base papers.
Recycled-based containerboard components normally consist of recycled liner, also called testliner, and recycled fluting medium in different grammages.
Testliner is a predominantly recycled fibre-based paper, which can be classified from 1-4 depending on their burst index and SCT values. Testliner 1 is the strongest and testliner 4, is the weakest medium allowed to be called testliner.
Recycled medium fluting comes in grammages from 100 g/m2 and up. Within this category there are four subgrades; Medium 2, Medium 1, Medium high performance 1 and Medium high performance 2. Medium high performance 2 is the strongest and Medium 2 is the weakest.
Lightweight recycled medium (LWM) is a predominantly recycled fibre-based paper, that comes in grammages below 100 g/m2. It can be used for low flute hights in lightweight containerboard and for packaging that doesn't require a lot of strength.
Source: CEPI, European list of corrugated base papers.
Nordic and international
Mathias Dufeld
Segment Owner Containerboard
Sweden
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