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  Making Pulp from Wood

Mechanical Pulp

This is a very cost effective but energy intensive process. because all the log apart from the bark is used. The log is put through a grinding or refining process to separate the fibres. Chemicals are not used, but there is a high energy use which can only partly be offset by using the bark as fuel. Mechanical pulp retains all the natural tree substances - sap, sulphur compounds, sugar and a lignin which binds the fibres together. Because lignin reacts with ultra violet light, papers made from mechanical pulp tend to 'yellow' when exposed to light.

Mechanical pulps are used to manufacture newsprint and some packaging boards.


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