All aluminum fully automatic 150m3 wood drying system/wood
dryer/wood drying kiln/kiln dryer
|Kiln dimension & capacity: Model RYJ150|
|Kiln external dimensions:||Width 11400 mm|
|Depth 8800 mm|
|Height 5900 mm|
|Kiln internal dimensions:||Width 11000 mm|
|Depth 8600 mm|
|Height 4500 mm|
|Kiln door:||Width 11080 mm|
|Height 4550 mm|
|Kiln capacity:||Approx 150m3/corresponding to 30mm of thickness of material to be dried and
|Type of door:||Lift-sliding door|
|Way of loading:||Forklift|
|Performance data: Model RYJ150|
|Bearing structure:||Aluminum alloy|
|Heating medium:||Thermal oil|
|Humidification medium:||Cold water|
|Type of automatic control system:||HOLZMEISTER M800B (DELHPI)|
|Number of fans:||7 units|
|Diameter of fan:||800mm|
|Volume of circulating air:||27,000 m3 /h|
|Motor:||3kw, class IP55|
|Voltage & Frequency:||380-440v, 50-60Hz|
|Snow Loading:||150 Kg/m2|
What Is Kiln Drying? The Reasoning Behind Drying Wood
The Kiln Drying Process
When trees are felled and brought to a lumber mill, the first step
is usually to debark and sort the logs by species, size or by end
use. Logs destined for wood flooring, for example, are then sawn
into rough boards of the required dimensions. These are often edged
or trimmed for length before they are dried.
Drying can be done either by air or by kilns, which use circulating
heated air to more rapidly remove the excess moisture from the
wood. Each charge (or kiln load) is sorted by species and
dimensions to optimize the process and to ensure that the final
moisture content levels are even across the charge. After the wood
has reached the correct moisture level for that species, it is sent
through the planer and planed to its final dimensions, sorted to
grade and shipped out. For wood flooring or other specific end
products, the wood is typically shipped to a manufacturer for
further planing, processing, and finishing. Mills and manufacturers
alike invest time, money and training into their drying processes
to provide optimal grade products at the correct moisture levels
for their customers.
So if the wood leaves the kiln at the required moisture content
level, the moisture content process is complete, right? It might
seem feasible, but in reality, kiln drying is only the first step
of a wood product’s life-long interaction with moisture. Kiln
drying significantly reduces the moisture content of green lumber,
but there’s more to be considered.
Moisture Past the Kiln
The reality of wood’s nature, and indeed, part of its attraction
over the centuries, is that it is a hygroscopic material. Until it
is fully sealed, wood constantly interacts with moisture in its
environment and will absorb or release moisture as necessary to
find a balance with its environment.
Examined closely, wood’s long, hollow cell structure means that
each board is composed of bundles of long cells (think of a stack
of drinking straws). In a living tree, those pathways function to
move moisture and nutrients from the roots to the branches and
leaves of the tree. Once the tree is felled, those pathways begin
to lose that moisture as the wood dries. That moisture is naturally
not replaced as it would be in a living tree, and the wood’s
moisture level will drop considerably as it dries. The kiln drying
process helps to draw that moisture out while minimizing the damage
to the wood that rapid changes might cause.
Why is that so important?
“Wet” or green wood does not function well for anything from
campfires to building materials. Its performance as green lumber
can be unpredictable because of that inevitable moisture loss after
the living tree is felled. As it dries, wood can twist, crack,
warp, and shrink in its physical dimensions, making it less than
ideal for buildings, flooring or woodworking. It’s an ongoing cycle
Think of a sponge. When a sponge is wet, it holds moisture in each
hole or cell. As it dries, it not only releases that moisture, it
shrinks in size. If it has been trimmed to a functional shape, like
a rectangle, it may twist or curl as it dries. It does not, though,
lose its capacity to reabsorb water when it is present. The
sponge’s physical dimensions will change each time it absorbs and
In the same way, wood may have much of its moisture removed during
the kiln drying process, but it does not lose the ability to
reabsorb moisture that is in its environment. It might be a direct
water source, moisture in an adjacent material or even humidity in
the air; wood’s cellular structure will be ready to absorb any
moisture it contacts.
1. How to choose size and capacity of the kilns?
It depends on time for drying cycle, and volume to dry per cycle or
2. How long does each drying cycle take.
It depends on species, size of timber, moisture content before
drying, and moisture content after drying.
3. What to be done before installation of kilns?
To complete concrete foundation according to seller's drawings, and
get power and water supply in position.