How is chemical wood pulp produced ?

Wood is made up from cellulose fibres, lignin, a material that binds the fibres together plus hemi-cellulose and some wood resins.

In a pulp mill, the cellulose fibres are separated and made into a mass of individual fibres. This is done by cooking wood chips in pressure vessels in the presence of soda liquor. After separation, the fibres are washed and screened to remove any remaining fibre bundles.

In a next step the pulp is bleached when it is destined for producing white paper. It remains unbleached when it is used for “natural” brown paper.

In a so-called ‘integrated mill’ the pulp is fed directly to a paper machine. When the pulp is destined for use elsewhere, it is dried and packed in bales to be shipped to paper mills worldwide for use as their raw material.

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