Mechanical pulp
In the case of mechanical pulp, the wood is processed into fibre form by grinding it against a quickly rotating stone under addition of water. The yield* of this pulp amounts to approx.
95%. The result is called wood pulp or MP – mechanical pulp.
The disadvantage of this type of pulp is that the fibre is strongly damaged and that there are all sorts of impurities in the pulp mass. Mechanical wood pulp yields a high opacity, but it is not very strong. It has a yellowish colour and low light resistance.