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Helmuth RESCH
Drying Wood With High Frequency Electric Current
PUBLISHED IN:
Society of Wood Science and Technology, Madison USA, 2009
ISBN 978-0-9817876-1-9, 84 pg.
For orders, please contact the author
at the following address:
vicki@swst.org
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This book offers a broad
coverage of research and development over
many decades up to industrial applications
of a special drying method, using high frequency
electric current for wood and wood products.
The book aims at providing some understanding
of the many ways to employ this technology,
characterised by rapid and relatively uniform
heat transfer inside wood, resulting in
high drying rates and avoidance of various
drying defects, like casehardening and oxidative
discoloration. The greatest emphasis is
placed on the method of combining radio-frequency
heating with vacuum drying, but also on
recent research concerning the use of microwaves.
Considerations on energy consumptions, technical
feasibility and economics complete this
reference piece of work.
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Graham Ian BRODIE
Innovative Wood Drying - Applying Mcrowave and Solar technologies to Wood Drying
PUBLISHED IN:
VDM Verlag Dr. Muller, Saarbrucken, Germany, 2008
ISBN 978-3-639-04670-0, 110 pg.
For orders, please contact the author
at the following address: http://www.amazon.com/exec/obidos/ASIN/3639046706/chainreadin04-20
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Emphasis in the hardwood
industry is shifting away from structural-grade
timber toward the production of high-value
products. Many dense hardwoods are extremely
difficult to dry without causing defects,
such as: splitting, warping, twisting or
collapse. Solar power is a convenient and
cheap energy source that can be easily applied
to timber drying. It greatly improves wood
quality and reduces drying costs by 50%
or more compared to conventional kilns;
however solar kilns are still slow and powerless
to manipulate the density and moisture permeability
of wood. A thorough mathematical study of
the microwave heating phenomenon demonstrates
that intense microwave energy can blast
tiny holes through the wood structure, creating
microscopic pathways through which moisture
may readily move. Thus, solar kln drying
times can be reduced by ca. 33%, without
affecting the drying quality.
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