Discussion
Match each wood component with its role or fate in pulping.
List I
A. Cellulose
B. Lignin
C. Hemicellulose
D. Extractives
List II
1. partly retained, aiding fibre bonding
2. the fibre that becomes the paper
3. resins and fats removed as tall oil or pitch
4. the binder that must be dissolved away
Answer: B
Knowing what each fraction does explains why yields differ so widely between mechanical and chemical pulping. Only the cellulose is wanted in full, and the others are removed to varying degrees. Yield follows directly from how much is dissolved.
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