We, JSC “Talsu mežrūpniecība” have started wood impregnation with the impregnation equipment “ SCHOLZ ” in 2018.
Pressure/Vacuum – Impregnation PL.
For chemical treatment of wood, environmentally friendly impregnation liquid CELCURE C4 is used, which is produced in Sweden and does not contain harmful impurities of chromium and arsenic.
The wood impregnation process is fully automated, in a closed vacuum autoclave, 14 m long, 1.8 m in diameter, and with a working pressure of 14 bar.
Wood treated in this way lasts significantly longer – up to 20 years , depending on the tree species, degree of drying, and chemical treatment class. Impregnated wood is successfully used in building construction, terraces, wooden fences, fences, shore reinforcements, etc., where there is contact with moisture and water, causing faster wood rotting.
VACUUM PRESSURE TREATMENT TAKES PLACE IN A SPECIAL AUTOCLAVE, WHERE THE FOLLOWING PROCESSES TAKE PLACE:
- vacuum, which opens the smallest pores of the wood and extracts maximum moisture from the wood surface;
- pressure (up to 14 bar), which pushes the preservative as deep as possible into the wood;
- a vacuum that sucks excess liquid from the surface of the wood.
Spruce and pine wood differ significantly in their composition, therefore the impregnation results for these woods also differ. differences. The possibilities for impregnating pine and spruce wood differ.
Pine, depending on the amount of moisture, can absorb the preservative into the entire surface, up to the core. In spruce, on the other hand, depending on the amount of moisture, the preservative can be pressed in a maximum of 2-5 mm deep. Accordingly, the service life of the stakes varies significantly.
IMPREGNATION CLASSES
The result of impregnation can be affected by various factors, such as the type of wood, humidity and the impregnation process itself. Therefore, there are several treatment classes , of which we only use classes 3 and 4:
3rd Class –UC3
For use above ground, in wet areas without a roof. (for terraces) Can be used in not very wet soils.
- The service life of undried and class 3 impregnated posts is 3-10 years. The thicker the post and the drier, sandier the soil, the longer its service life.
4th Grade – UC4
In direct contact with water and in particularly wet soils.
- To ensure a service life of up to 20 years, sheds used for pastures, fences, bank fortifications or other purposes must be impregnated with treatment class 4. In order to qualitatively impregnate with treatment class 4, the following conditions must be met:
- the stakes must be made of pine wood;
- before impregnation, the posts must be dried – the humidity must not exceed 28%;
- The sealant must be pressed all the way into the core – the full thickness of the coating.
