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Kraft Pulp, Linerboard and Fluting Medium
Kraft ("strong") paper comes from wood chips cooked under pressure at 170–176 °C in white liquor, a solution of sodium hydroxide and sodium sulfide that dissolves the lignin. About half the wood comes out as brown pulp. Softwood pulp makes linerboard and brown kraft paper; hardwood pulp makes the fluting medium. A paper machine forms, presses, dries and reels it.
The picture: our diagram of chips, digester and paper machine.
Advanced
Factory process
Instructions
1
1
Chip the logs
Chip the logs
Cut the softwood and the hardwood logs to length and chip each separately.
Materials for this step:
Softwood Logs1 piece
Hardwood Logs (Oak, Maple, Beech)1 pieceTools needed:
Chainsaw (professional forestry grade)
Wood Chipper2
2
Make the white liquor
Make the white liquor
Dissolve sodium sulfide into the sodium hydroxide solution: this is the white liquor.
Materials for this step:
Sodium Hydroxide - 10% solution20 liters
Sodium Sulfide1 kgTools needed:
Chemical-Resistant Gloves
Safety Goggles3
3
Cook
Cook
Cook each batch of chips in white liquor in the closed digester at 170–176 °C until the lignin has dissolved and the chips fall apart.
Tools needed:
Pulp DigesterChemical-Resistant GlovesSafety Goggles4
4
Wash the brown stock
Wash the brown stock
Drain off the black liquor and wash the brown pulp with water.
Materials for this step:
Water100 litersTools needed:
Chemical-Resistant Gloves5
5
Form, press, dry, reel
Form, press, dry, reel
Dilute the pulp and run it on the paper machine: drain it on the wire, press it between rolls, dry it round the steam cylinders and wind it on reels. Softwood pulp gives linerboard and brown kraft paper; hardwood pulp gives fluting medium.
Tools needed:
Paper Machine6
6
Pulp yield
Pulp yield
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Materials
5- 1 piecePlaceholder
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- 20 litersPlaceholder
- 1 kgPlaceholder
- 100 litersPlaceholder
Tools Required
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