1. Wood Science and Woodyard Operations
PPT 115

2. Defintions, Importance, & History

3. Definitions
Paper – a felted sheet of fibers formed on a fine screen from a water suspension
Pulp – the fibrous raw material for papermaking
Dissolving Pulps – pulps used for chemical conversions into other products
Paperboard – paper that is greater than 0.3mm thick (11.8 mils or inches)
Remember 1/32 inch = inches

4. Importance of Paper Information In Roads Recording Storage
Dissemination
In Roads
Plastics – like straw wrap
Electronic Media – “hard copy” / newspapers

5. Papermaking circa 1500

6. History The bees and wasps Papyrus – Ancient Egyptians
AD 100 – Chinese
Papermaking with cotton and linen rags
1690 – first paper mill in North America
1798 – papermaking machine in France
1803 – Fourdrinier machine
1809 – Cylinder machine

7. Papermaking Process Rags make paper Paper makes money
Money makes banks
Banks make loans
Loans make beggars
Beggars make rags
Author Unknown
Circa 18th Century

8. Papermaking Process
Capital Intensive
Water
Cellulose Fibers

10. Water Millions of Gallons Process the water Reuse the water
Discharge/no discharge

11. What is wood
Lignin
Carbohydrates
Extractives

12. Lignin
E. Alder, Wood Sci. Technol., 11:169 (1977)

13. Location of Lignin
Cell Wall
Middle Lamella

14. Fiber Structure
Primary Wall

16. Cellulose Fibers Carbohydrate – C – H – O Polysaccharide – Sugars
Purity vs Yield
Hydrophillic

17. Hardwood Chip Close-up

18. Softwood Chip Close-up

20. Describe the Process
Forest/Plantation
Log/Chip

24. Longwood Harvesting