Describes how bulky (voluminous) the cartonboard is, measured in cubic metres per kilogram (m3/kg).
Bulk (m3/kg) = 1 / densityorBulk (m3/kg) = ( thickness (μm) ) / ( grammage (g/m3) x 1000 )
Cartonboard which is bulky (voluminous) in relation to its weight is said to have high bulk. Compact cartonboard has low bulk. Cartonboard with high bulk generally feels stiffer and thicker than cartonboard with the same grammage but with low bulk.
Brightness is a concept used in two different contexts:
1) When referring to image reproduction, brightness describes the intensity of the colours. This is also called luminance, i.e. how light or dark an image is.
2) When referring to cartonboard, brightness is expressed as the precentage of light which is reflected from a cartonboard surface at a wavelength of 457nm (nm = nanometre).
Description of Cartonboard
Description of Pulp and Recovered fibre
Types of Cartonboard
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