All aluminum fully automatic timber drying oven for hardwood and
1. BEARING STRUCTURE
The structure of the kiln is made completely of special aluminum
alloy AW6063. All the beams, profiles, and roof holding structure
as well as wind-bracing have high resistance to corrosion, which
are of I, U, L & C .
The complete structure is self-supporting and is mounted on to a
base concrete foundation using stainless- steel heavy-duty dowels.
The connecting materials, bolts, nuts &washer are made of
stainless steel. The offered bearing structure can bear stress of
150kg/m2 of snow load and wind load of 120km/h.
2. KILN CASSETES SHEETING AND INSULATION SYSTEM
The heat insulation system is made of aluminum cassette-panels of
alloy with high density non-flammable rock wool thermal insulation
of 120mm thickness, the density of rock wool is 55kg/m3, which is
higher than that of fiberglass. There is a slope on the roof,
avoiding accumulation of rain or snow on the roof. The kiln wall is
externally and internally faced with corrugate embossed aluminum
sheets with a granulated finish of 1.1 mm. The Cassettes themselves
are specially mounted with the supported of aluminum plate between
columns of bearing structure. High-temperature caulking between
cassettes protects the walls from heat transfer. The caulking is
applied at any cassettes joints.
The thermal constant of the jacket penetrability is
k=0.45w/m-2.k-1. This is due to the particular construction
characteristics of the walls. They are completely fire resistant;
they do not absorb moisture, guaranteeing constant operation.
3. KILN DOOR
The lifting –sliding sturdy aluminum door structure profile. The
special groove where the strong rubber seal is installed provides
optimum tightening alongside the doorframe. The kiln door wall is
of the same construction as the kiln and roof walls using rock wool
insulation of 120mm.The closing system is equipped with adjustable
counterparts which enable the precise adhesion of the door to the
kiln structure. The bottom mullions feature nylon rollers on heavy
duty stainless pins
4. KILN DOOR CARRIER AND LIFTING DEVICE
The TECH I’ beams monorail carriage design realizes unrestricted
movement of the door which hangs vertically in its raised position.
Carriage wheels are sealed ball bearing to in any weather
5. INSPECTION DOOR
The inspection door is included and is of opening 1500×600 mm
with rock wool insulation of 120mm.
It is equipped with a safety handle, easy to open and close.
The inspection door will be placed in rear wall.
6. FALSE CEILING
The chamber is divided by aluminum intermediate ceiling into a
technology section where all the technical elements are located and
a drying section where the timber to be dried is placed. The
intermediate ceiling is mounted on the lower part of the chamber
beams and is made of corrugated profile sheets of thickness1.1 mm
ensuring the smooth air flow.
7 FANS & MOTORS
The air ventilation is provided by reversible medium pressure fans
with high performance level installed in each chamber above false
ceiling of the chamber. The fans can perform with the same
efficiency and capacity in both direction and at any revolution
rate. Each fan has 6 aluminum swinging blades with perfectly
symmetrical shape. The aluminum fan φ800 mm impellers are fixed
directly on to the shaft of the specially designed motors. The
motors are tropically insulated to resist high temperature (IP55)
and to work without any problems in environments reaching 100% of
8 HEATING ELEMENTS
The heating elements use aluminum fin built on stainless steel
pipe. Heat exchanger coils are located vertically overhead. All the
piping from collectors for the heat exchanger coils up to flanges
out of kilns are made in stainless steel. The heat output is
designed for the highest demand.
9. THE AIR EXCHANG SYSTEM
The ventilation and suction system of vents are made of aluminum
material. Vents make use of pressure and vacuum zones generated
inside the chamber which avoids the use of additional fans. The
whole system of vents works simultaneously. In this offer the
chimney are provided in the chamber ceiling. The vents are positive
opening and closing.
10. ELECTRIC BOARD
The board is the modular panel meeting the international standards
relevant to protection class IP55. The operating drying components
are placed in the electric board. (Switches, relays, fusing etc.)
11. AUTOMATIC CONTROL OF THE DRYING PROCESS HOLZMEISTER M800B
Every unit is equipped with:
6 pcs of probes to detect the wood moisture
2 pcs of EMC stations/ front and back / For climate controlling
It is a LCD based automatic kiln controller. The kiln dryer
controller DELPHI is based on the most advanced electronic
technology today available and includes all the best solutions that
LOGICA H&S has developed in over ten years of experience in
timber drying control systems.
The new user interface, based on a LCD graphic display having a
very good readability, allows an easy set-up also to not skilled
users, because all setting are made through self-explaining menu
and the access to most advanced menus, divided from the ones most
What Is Kiln Drying? The Reasoning Behind Drying Wood
Kiln drying is a standard practice in wood production mills and
serves to efficiently bring green lumber moisture levels down to
“workable” range–moisture content levels that will not end in the
myriad of problems that can be caused by excess moisture levels in
These problems include warping and twisting in dimensional lumber,
binding or kicking during machining, buckling or crowning in an
installed wood floor, and adhesive failures in finished products.
Moisture-related problems can cost millions of dollars in damages
each year. Kiln drying is a first step in bringing all wood
products to moisture content (MC) levels that will be subject to
minimal moisture-related damage.
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.
Even when wood has been kiln-dried, it may have a documented
moisture content level, but at any step of the processafter the
kiln–transportation, manufacturing, storage or installation–it is
possible for wood, even manufactured wood products, to lose
additional moisture (in a dry environment) or re-absorb ambient
moisture, altering its moisture content level and possibly even its
dimensions. If that moisture increase or decrease happens, for
example after a wood floor has been installed, buckling, crowning,
gaps, or other moisture-related problems can jeopardize the floor’s
integrity. Any completed wood project or product can be jeopardized
by moisture imbalances in the wood used.
What’s the Solution?
Just as lumber mills and manufacturers invest in accurate wood
moisture content management tools and systems, each step of a wood
product’s lifespan requires moisture content measurement.
Continuing with our wood flooring example, it is just as important
that the flooring installer allows each board bundle to acclimate
to the job site environment before installation begins as it is for
the manufacturer to make sure the moisture content is accurately
monitored before it leaves the plant.
An accurate wood moisture meter can provide quick, accurate and
reliable monitoring of wood flooring to ensure that the installed
floor will not suffer from moisture-related problems like those
identified above. Wagner Meters’ non-damaging line of pinless wood
moisture meters can take measurements as frequently as necessary
without marking the floorboards or causing imperfections that will
become visible once the finish is applied. With accurate and
current wood moisture content measurement, the flooring can be
installed with assurance and finished for long-lasting and durable
From forest to final finish, wood’s relationship with moisture must
be understood and accurately measured, not just in the kiln but at
each step of the way to its final use.
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.