Bonds, Boilers and a Disputed Inventor: teacher key

How Paper Is Made, grade 12 edition, written for 12th grade and up. The chemistry that holds a sheet together, a mill that powers itself, and the thin evidence behind the story of Cai Lun.

Read the book. Print this page for the key.

Questions and answers

1. What holds the sheet together at the level of molecules?
   • Added glue
   • Hydrogen bonds between cellulose in neighboring fibers (answer)
   • Wax
2. Why does the Cai Lun story call for care?
   • He never lived
   • The source is lost
   • The main source was written nearly 300 years after his death (answer)
3. What does a modern kraft mill make more of than it uses?
   • Electricity (answer)
   • Water
   • Lime
4. What did Charles Kinsey do before his work was forgotten?
   • Invented washi
   • Patented a continuous papermaking machine in 1807 (answer)
   • Found lignin
5. What does the word virgin mean in virgin fiber?
   • New, not recycled (answer)
   • Very old
   • Dyed

Words

• kraft: strength
• lignin: natural wood glue
• washi: Japanese paper
• recovery: getting back