+45 97 18 10 88                     ContactNews | Sales and Service

WTT Wood Treatment Technology Full-automatic impregnation

First class impregnation of wood in record time

The full-automatic high pressure timber impregnation plant from WTT has been developed with the aim to operate up to 16 hours without supervision. The annual capacity of the full-automatic plants varies from 26,000 m³ to 60,000 m³ of wood.

Durability class insured with minimal work force. The impregnation process insures the wood durability classes 3 and 4 and can be managed by only one operator for 8 hours. The job of the operator contains in just loading and unloading the charging area.

Tilting system. The autoclave is tilted 5 degrees during the process, which facilitates the dripping of superfluous impregnation solvents via grooves and shipways. After exiting the plant through the chain track, the wood packets are tilted transversely at 5 degrees, in order for the solvent to drip off.

After approx. 16 hours on the chain track the wood is already dried enough to be safely transported to the storage area. All the rest of superfluous impregnation solvent is lead back to the storage tanks by using the steel plate underneath the dripping area.

How does it work? All information about the wood packets (width, thickness, length and volume) is scanned by a bar code reader and automatically sent to the control system, that chooses the impregnation program according to the information sent. When the process is completed, the data regarding the impregnation date and uptake amount (kg/m³) is returned to the bar code.

Timber impregnation treatment in a fully-automatic system

WTT Wood Treatment Technology Full-automatic impregnation plant


26.000-60.000 m³ / year


On water-based preservatives

Wood protection

For classes 3 and 4

Quality standards

EC Pressure Equipment Directive


The autoclave is manufactured in high quality stainless steel and is equipped with side walls (baffles) that reduce the amount of fluid to be pumped in and out of the plant.

The plant consists of two or more storage tanks with an automatic shift between impregnation hazard class 3 and 4 or between green and brown impregnation solution.

The plant is also equipped with a powerful filling and emptying pump that enables the plant to operate under The Lowry process – a process without the initial vacuum phase which reduces the uptake amount from 300 to 150 L/m³.


Key advantages of the WTT full-automatic impregnation:

  • Best option for large volume of wood that needs to be treated in record time – 12 charges within 24 h.
  • Ensures wood protection for classes 3 and 4
  • Can be controlled by only one operator
  • Test run in our factory provided
  • High annual capacity
  • Incorporates the most up to date control system
  • Possibility to access the plant remotely via TeamViewer
  • In compliance with the standards stipulated in the EC Pressure Equipment Directive (PED)
  • Delivered with an EU certificate

Full-automatic system photos

WTT Wood Treatment Technology loading track

The wood pallets are placed on the loading track.

WTT Wood Treatment Technology loading area

The loading and unloading area.

WTT Wood Treatment Technology wood data

The wood data provides the basis for selecting the impregnation program.

WTT Wood Treatment Technology already treated wood

This screenshot shows the supply of untreated wood and already impregnated wood.

WTT Wood Treatment Technology non-impregnated wood packets

The transport wagon brings the wood inside the treatment area and…

WTT Wood Treatment Technology transport wagon

…transports it to the autoclave, where the door opens automatically.

WTT Wood Treatment Technology finished impregnated wood

The finished impregnated wood is ready to leave the autoclave.

WTT Wood Treatment Technology impregnated wood pulled out

The impregnated pallets are pulled out by the coupling trolley.

WTT Wood Treatment Technology Fixation and drip off area

In the fixation and drip-off area, the wood pallets are tilted to 5°.

WTT Wood Treatment Technology Untreated Packets are pulled in

The impregnation process continues with bringing in next pallets of untreated wood.

WTT Wood Treatment Technology Hydraulic Clamp

Automatic clamp for the wood packets.

WTT Wood Treatment Technology Hydraulic Locking

Full-automatic door opening with safety closure device.

WTT Wood Treatment Technology Hydraulic Tilting

The hydraulic tilting of the plant ensures optimum dripping of the remaining impregnation solvent.

WTT Wood Treatment Technology Drip off fixation area

The drip off area.

WTT Wood Treatment Technology Transport Waggon

Transport wagon in position for the next charge.

WTT Wood Treatment Technology double vacuum pumps

Double vacuum pumps.

WTT Wood Treatment Technology Vacuum Tank

The vacuum tank ensures the optimal filling of the autoclave.

WTT Wood Treatment Technology Pump section

The pump section with frequency controlled pressure and transport pump.

WTT A/S: Full-automatic wood impregnation plant