Wood Science and Woodyard Operations PPT 115

Defintions, Importance, & History

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 0.0118 inches) Remember 1/32 inch = 0.0313 inches

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

Papermaking circa 1500

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

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

Papermaking Process Capital Intensive Water Cellulose Fibers

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

What is wood Lignin Carbohydrates Extractives

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

Location of Lignin Cell Wall Middle Lamella

Fiber Structure Primary Wall

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

Hardwood Chip Close-up

Softwood Chip Close-up

Describe the Process Forest/Plantation Log/Chip

Longwood Harvesting