paper technology : wood pulp - bleaching 2
TRANSCRIPT
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| [Presentation title] | [Client Name] | [Date] 1
Paper technology
Wood pulp / Bleaching (2)
Technical Support
Sappi Fine Paper Europe
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| [Presentation title] | [Client Name] | [Date] 2
Wood pulp production
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| [Presentation title] | [Client Name] | [Date] 3
Wood pulp
The digester is opened
Introduction of the vapour filling apparatus
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.
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| [Presentation title] | [Client Name] | [Date] 4
Wood pulp
Sampling of cooking acid Control of the pulping degree
Emptying of the digester Diffusion washing
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| [Presentation title] | [Client Name] | [Date] 5
Wood pulp
Process monitoring Wood pulp washing
Wood pulp before washing Wood pulp after washing
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| [Presentation title] | [Client Name] | [Date] 6
Bleaching towers
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| [Presentation title] | [Client Name] | [Date] 7
Bleaching tower
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| [Presentation title] | [Client Name] | [Date] 8
Observation point pulp mill
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| [Presentation title] | [Client Name] | [Date] 9
Wood pulp
Unwashed, unbleached wood pulp Wood pulp in the bleaching intermediate step
Bleached and unbleached wood pulp
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| [Presentation title] | [Client Name] | [Date] 10
Fibrous substances
Long fibres
Length: 800 - 4500 µm
Thickness: 25 - 80 µm
Short fibres
Length: 200 - 800 µm
Thickness: 2,5 - 28 µm
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| [Presentation title] | [Client Name] | [Date] 11
Fibre
Hygroscopic effect by capillaries
Moving direction of
the fibre
Extension direction of
the fibre
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| [Presentation title] | [Client Name] | [Date] 12
Wood pulp bale