Basic Lumber Drying Workshops
This course is not currently scheduled.
Overview | Program | Sponsors
Overview
Proper lumber drying is fundamental and crucial to using
wood for most applications and products. Kiln drying, if
done properly, can open the doors to new markets. However,
if lumber is poorly dried, the wood product manufacturer
down the road will experience problems with machining, parts
fitting, glueing and finishing. This can be disastrous to
a new dry kiln operator. Whether you already own a kiln or
are planning to buy or build one, it's very important to
understand how wood dries.
You can learn how to avoid drying problems by attending
one of these workshops. The program will cover how wood dries,
how drying stresses develop, how to avoid drying degrade,
dry kilns and drying procedures. The instructors are Bob
Erickson, Professor Emeritus, and Harlan Petersen, Extension
Specialist, both with the Department of Bio-based Products,
University of Minnesota. Together they have over 60 years
of experience in lumber drying and wood-moisture related
teaching, research and extension outreach. They are excellent
instructors, and they can answer your questions. This workshop
should be especially beneficial to sawmill operators, wood
product manufacturers, wood hobbyists, or anyone who now
owns or plans to buy or build a kiln, in the future.
Seating is limited so we encourage you to register early.
We look forward to seeing you at one of the workshops. If
you should have any questions, please give any one of us
a call.
Harlan Petersen
Extension Educator
Dept. of Bio-based Products
St Paul Campus
612-624-3407
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Program
| 8:00-8:30 |
Registration |
| 8:30-8:45 |
Welcome, Introductions, and Overview - Mike Demchik,
Mike Reichenbach |
| 8:45-10:00 |
Why moisture must be removed. Wood moisture content
and calculations. Free water and bound water in wood
and how they affect the properties of wood. - Robert
Erickson |
| 10:00-10:30 |
Break |
| 10:30-12:00 |
How moisture moves through wood. Relationships between
drying stresses, shrinkage, and degrade. Relative humidity,
temperature, and EMC relationships. - Robert Erickson |
| 12:00-1:00 |
Lunch |
| 1:00-2:30 |
Stickers, stacking, storage, yard layout, air drying,
preventing degrade, moisture meters - Harlan Petersen |
| 2:30-2:50 |
Break |
| 2:50-3:00 |
Preventing sapstains and chemical stains |
| 3:00-4:30 |
Drying schedules, monitoring drying rates and conditions,
using sample boards. Advantages and disadvantages of
different drying systems and kilns. -Harlan Petersen
and Robert Erickson. |
| 4:30 |
Summary and evaluation |
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Sponsored by:
- Wood-Mizer, Inc
- Rockler Woodworking and Hardware
- Minnesota Department of
Natural Resources, Forestry Division
- University of Minnesota Extension Service,
College of Food, Agricultural and Natural Resource
Sciences, Department of Bioproducts and Biosystems Engineering
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