3. Wood pulp
The digester is opened Placing of the vapour filling apparatus
The chips are cooked in the digester for 8-10 hours
with the chemical magnesium bisulphite. It reacts
with the lignin of the wood to lignin sulphone acid
which is completely water-soluble and can, thus,
be easily washed out of the pulp.
Introduction of the vapour filling apparatus
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4. Wood pulp
Sampling of cooking acid Control of the pulping degree
Emptying of the digester Diffusion washing
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5. Wood pulp
Process monitoring Wood pulp washing
Wood pulp before washing Wood pulp after washing
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11. Fibre
Hygroscopic effect by capillaries
Moving direction of
the fibre
Extension direction of
the fibre
11 | [Presentation title] | [Client Name] | [Date]