Do VacDry vacuum kilns change the color of my lumber?

Wood dried by a VacDry vacuum kiln is dried in a low oxygen environment, at temperatures much lower than those found in conventional or dehumidification kilns.  Kiln schedule lengths are significantly shorter.  Changes to the composition of the raw wood are less severe in comparison to conventionally dried wood.  This may be a boon, if you are working with Hard Maple.  This may be an issue, if you're trying to darken the sapwood in your Koa.  Most species come out much brighter!

Do VacDry vacuum kilns allow for just-in-time manufacturing?

For the first time, the forest products industry can take advantage of just-in-time manufacturing.  Significant inventory on sticks under sheds, because you aren't sure what is going to sell next month?  A huge log yard, so you can get a few months of leeway to adjust to changes in the industry?  Because VacDry vacuum kilns dry so much faster from green, you'll be able to vastly reduce log and stickered inventory.  You can take orders you weren't able to respond to in time, and quickly get the needed dried wood in inventory.  You can out compete your competitors when your drying times are reduced by 60 to 80%!

Do VacDry vacuum kilns incur less degrade during the drying process?

VacDry vacuum kilns are designed to allow for precise control of the factors that set the drying rate of the wood.  With precise control of the heat, the humidity, and the chamber pressure, schedules do not set conditions that create excessive moisture gradients between the core and the shell of the wood.  This means fewer end checks, fewer surface checks, and less degrade around existing defects such as knots and inclusions.  After installing our vacuum kilns, bat billet manufacturers who used to cut 40" billets realized they were needlessly throwing away good wood, and ended up with 37" billet lengths due to practically zero introduced degrade from the drying process!

Are VacDry vacuum kilns more energy efficient, and save me money per kiln charge?

In a conventional kiln, the longer your kiln schedule, the longer those circulation fans are running and the more heat and steam that ends up vented to the great outdoors.  In a VacDry vacuum kiln, only two small energy efficient water pumps run continuously.  The main drying force of the vacuum pump only runs when needed.  Just as significant, vacuum is a great insulator and the wood is in direct physical contact with the heat source: practically every BTU that enters the kiln chamber is used to directly evaporate water, which tremendously increases efficiency.  Convective losses are practically nonexistent, conductive losses are very minimal, and the naturally minor radiant losses are kept in check with a small amount of insulation.


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