Wood Preparation & Pulp Wood Measurements PPT 115

Woodyard Overview

Pulpwood Operation Safety Quality of wood Economics – Profit & Loss Weight of Dry Wood Moisture content Dry density Differs vary greatly between species Relatively the same for a species

Indirect Measures Volume Gross – cord Solid – cunit Bulk Volume - unit Amount of water displaced Green Weight & Accurate estimate of moisture Bulk Volume - unit

Roundwood Delivery

Unloaded logs Grapples Storage in woodyard Sorting Slasher Deck – cut down Deicing and/or washing Reduce sand/soil etc Debarking

Wood Preparation Logs to chips Logs to lumber Logs to shortwood - groundwood

Residuals SAWMILL WOOD PREP PLANT PLYWOOD PLANT PULP MILL LUMBER CHIPS SAWDUST SHAVINGS PULP MILL PULP & PAPER

Rail Delivery

Wood Storage

Wood Storage

Shortwood Flume

Log Handling

Log Handling

Debarking Mechanical –friction- rotating drum/log to log action Wet or dry Bark burning furnace Cambium shearbarkers – inner bark and cambium layer Some debarkers work better on frozen logs High wood loss? Rosser headbarkers Hydraulic In the West Water pressure Capital/energy cost are high but yield is high Hard to process effluent

Barking Drum

Barking Drum

Barking Drum

Ring or Knife Debarker

Bark Contaminants

Bark Inorganics Bark Wood Calcium, lb/ton 2-20 1-2 Silica, lb/ton 2 0.02-0.1 Alumina, lb/ton 0.2-2 0.02

Bark Organics Pitch Fatty Acid Salts Rosin Acid Salts Resinous Alcohols Turpenes Waxes