What is woodpulp ?

There are various types of wood pulp. It is called “mechanical” when wood is reduced to small fibres in a mechanical grinding process. A variation of this is “thermo-mechanical” whereby the wood is first softened in a steaming process. These types of pulp are mainly used for newsprint and other so-called “wood containing” papers.

“Chemical” pulp is obtained when cellulose fibres are separated from wood fibres in various types of cooking processes. Pure cellulose makes 40-45% of the dry weight of wood.

Chemical pulp is stronger than mechanical pulp. The strength is also determined by the type of wood. Softwood, like spruce and pine, give 3-4 mm long fires, whereas hardwood fibres (birch, aspen, etc) are 1-1,5 mm long. Paper made from mechanical pulp is “yellowing’ very quickly like unpainted wood. Cellulose based paper does not fade.

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