![]() 03: Paper Weights & GSM Variances between papers usedĪs a final point of reference / explanation, below is a common list of terms relating to board grades and corrugated material in general.Īcross Flute – a unit of measurement which is used to measure corrugated (or other fluted material such as Correx®), the measurement is the opposite direction of the flute (so width).īacking Liner – A compressible paper material which, compensates for any irregularities on the surface which is sealed. Please note however this list is not exhaustive, and there are a number of other specialist papers available. The final 2 paper types listed here are those most commonly used for flutes, and less often used for liners. SEMI CHEM (SC): Virgin fibres using neutral sulphite semi-chemical process.MOTTLED KRAFT (MK): Mottled white Kraft.WHITE TOP (WT): White coated recycled liner.FULLY BLEACHED WHITE (BW): Fully bleached Kraft liner.TEST 2 (T2): Partly recycled liner paper. ![]() ![]() The available paper grades for outer and inner liners when manufacturing cardboard are as follows: However, despite Kraft and Test liners being so popular, there are in fact a number of other options. A basic layer is used adhesion and strength, whilst a finer “cover” layer is used mainly for improved aesthetics and to aid printing. Each liner type is actually comprised of two distinct layers. ![]()
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