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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.
高级
Factory process
说明
1
1
Chip the logs
Chip the logs
Cut the softwood and the hardwood logs to length and chip each separately.
此步骤所需材料：
针叶木原木1 个
硬木原木（栎、槭、山毛榉）1 个所需工具：
链锯（专业林业级）
木材削片机2
2
Make the white liquor
Make the white liquor
Dissolve sodium sulfide into the sodium hydroxide solution: this is the white liquor.
此步骤所需材料：
氢氧化钠 10 % 溶液20 升
硫化钠1 公斤所需工具：
耐化学品手套
密闭式护目镜3
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.
所需工具：
纸浆蒸煮器耐化学品手套密闭式护目镜4
4
Wash the brown stock
Wash the brown stock
Drain off the black liquor and wash the brown pulp with water.
此步骤所需材料：
水100 升所需工具：
耐化学品手套5
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.
所需工具：
造纸机6
6
Pulp yield
Pulp yield
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