Paper technology : wood pulp - bleaching 2

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Paper technology : wood pulp - bleaching 2

  1. 1. Paper technology Wood pulp / Bleaching (2) Technical Support Sappi Fine Paper Europe1 | [Presentation title] | [Client Name] | [Date]
  2. 2. Wood pulp production2 | [Presentation title] | [Client Name] | [Date]
  3. 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 apparatus3 | [Presentation title] | [Client Name] | [Date]
  4. 4. Wood pulp Sampling of cooking acid Control of the pulping degree Emptying of the digester Diffusion washing4 | [Presentation title] | [Client Name] | [Date]
  5. 5. Wood pulp Process monitoring Wood pulp washing Wood pulp before washing Wood pulp after washing5 | [Presentation title] | [Client Name] | [Date]
  6. 6. Bleaching towers6 | [Presentation title] | [Client Name] | [Date]
  7. 7. Bleaching tower7 | [Presentation title] | [Client Name] | [Date]
  8. 8. Observation point pulp mill8 | [Presentation title] | [Client Name] | [Date]
  9. 9. Wood pulp Unwashed, unbleached wood pulp Wood pulp in the bleaching intermediate step Bleached and unbleached wood pulp9 | [Presentation title] | [Client Name] | [Date]
  10. 10. Fibrous substances Long fibres Short fibres Length: 800 - 4500 µm Length: 200 - 800 µm Thickness: 25 - 80 µm Thickness: 2,5 - 28 µm10 | [Presentation title] | [Client Name] | [Date]
  11. 11. Fibre Hygroscopic effect by capillaries Moving direction of the fibre Extension direction of the fibre11 | [Presentation title] | [Client Name] | [Date]
  12. 12. Wood pulp bale12 | [Presentation title] | [Client Name] | [Date]

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