The document discusses the process of transforming wood into paper. It begins with harvesting trees and producing wood chips. The chips are then sorted by wood type and pulped using different mechanical and chemical processes. This breaks down the wood fibers for use in papermaking. Key steps include debarking logs, chopping into chips, and pulping the chips to create a fibrous slurry that can be formed into paper.

1. Paper technology
Wood pulp / Bleaching (1)
Technical Support
Sappi Fine Paper Europe
1 | [Presentation title] | [Client Name] | [Date]

2. Paper technology
From wood to coated paper
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3. Paper technology
Fibrous substances /
wood pulp
PAPER Process materials
Water
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4. Thinnings
Lumbering of a released stem Thinnings
Dispatch to the paper mill Diseased wood for paper production
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5. Wood trunk
Annual rings
Pith
Cambium
Medullary ray
Heart wood
Splint wood
Spring wood
Rind or bark one annual ring
Autumn wood
Bast
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6. Wood types
Types of wood for the paper production
Deciduous wood (approx. 20%) Coniferous wood (approx. 80%)
Beech Spruce
Birch Fir
Poplar Pine
Eucalyptus
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7. Wood types
Beech Birch Poplar Eucalyptus
Spruce Fir Pine
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8. Beech trunks
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9. Slabs
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10. Chips
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11. Pulping
Pulping process
Chemi-
Mechanical Thermo-mechanical Chemical
thermo-mechanical
MP TMP CTMP Sulphate process Sulphite process
Mechanical pulp Thermo-mechanical- Chemi-thermo- (alkali) (acid)
(mechanical pulp) pulp mechanlcal-pulp
yield 90-96% yield 90-96% yield 85-90% yield 43-52% yield 43-52%
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12. Wood preparation
Chopped
Wood place
Chips
Round wood
feeding
system Chipper
Unbarking
Metal detector
Round wood
washing
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13. Unbarking drum
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14. Chopped chipper apparatus
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15. Chips
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