The industry was once based almost entirely on softwoods such as spruce, pine, larch, fir and cedar. Now birch, aspen and other hardwoods occurring in temperate climates are used as an ideal raw material for processing into fluting for corrugated cases as well as printing and writing papers, whilst eucalyptus, originally occurring only in Australia and New Zealand, has been successfully cultivated in other warm climates (eg South America, Spain and Portugal) as raw material for high-quality pulp suitable for a wide range of papers. Nevertheless, softwoods provide longer fibres (average 3 mm compared with 1mm for hardwoods) and continue to be used for papers required to have the highest strength characteristics.
(taken from www.paperonline.org)
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