Introduction to wood preservative treatment
2024-04-17 12:07:20
Anti-corrosion treatment Wood is a surface coating or wood that injects chemicals under pressure. Chemicals enhance their ability to withstand corrosion and insects.
The anti-corrosion treatment program does not change the basic characteristics of the wood, but instead increases the service life of the wood building materials under severe conditions of use.
If working effectively, wood preservatives must be used under controlled conditions in accordance with known specifications to ensure good protection of the wood. The Canadian Standards Association (CSA) publishes wood protection standards that include these specifications. CSA's O80-M standard "Wood Protection" details the requirements for Canadian wood species and also incorporates certain standards from the American Wood Protectors Association (AWPA).
The reason why the tree species can be easily preserved is because of the principles of cell biology and the procedures used. Canada has a wide variety of wood species. Some tree species are more difficult to pressurize.
Procedures <br> Most preservative treatments use a whole body impregnation method in which the wood is placed in a high pressure vessel and the vacuum is used to extract the air from the wood cells. The preservative solution can enter the cylinder where it is drawn into the cells by a vacuum cleaner. Then use a high pressure of 690 to 1380 kPa (100 to 200 psi) to force more preservative into the wood (as shown in Figure 1 below). Finally, a vacuum cleaner is used to remove excess chemicals from the surface.
For all types of preservative treatment methods, the amount of preservative that can enter and remain in the cell depends, in part, on the moisture content of the wood. The amount of moisture present in the cell cavity during the treatment of the method affects the influx of the preservative.
For this reason, the moisture content of wood raw materials is an important aspect of quality control.
For water-soluble preservatives, the water content of the treated sawn wood should be in the lower range (15% to 25%) so that the preservative can easily enter and chemically react on the cell wall. If there is excess water in the cells, the rebound pressure will expel the preservative from the cells once the treatment pressure has subsided.
In order to enhance the penetration of wood preservatives, an adjustment procedure is applied to reduce the moisture content of the wood. The method may be air drying, kiln drying or steaming and vacuuming in a processing cylinder, or boiling the treatment solution under vacuum.
In order to avoid the release of excess chemicals after treatment, time should be allowed at the manufacturing site to allow the chemicals entering the wood cell wall to be fixed. Once the fixation phase is over, the water-soluble preservative is chemically adsorbed on the cell wall.
The anti-corrosion treatment program does not change the basic characteristics of the wood, but instead increases the service life of the wood building materials under severe conditions of use.
If working effectively, wood preservatives must be used under controlled conditions in accordance with known specifications to ensure good protection of the wood. The Canadian Standards Association (CSA) publishes wood protection standards that include these specifications. CSA's O80-M standard "Wood Protection" details the requirements for Canadian wood species and also incorporates certain standards from the American Wood Protectors Association (AWPA).
The reason why the tree species can be easily preserved is because of the principles of cell biology and the procedures used. Canada has a wide variety of wood species. Some tree species are more difficult to pressurize.
Procedures <br> Most preservative treatments use a whole body impregnation method in which the wood is placed in a high pressure vessel and the vacuum is used to extract the air from the wood cells. The preservative solution can enter the cylinder where it is drawn into the cells by a vacuum cleaner. Then use a high pressure of 690 to 1380 kPa (100 to 200 psi) to force more preservative into the wood (as shown in Figure 1 below). Finally, a vacuum cleaner is used to remove excess chemicals from the surface.
For all types of preservative treatment methods, the amount of preservative that can enter and remain in the cell depends, in part, on the moisture content of the wood. The amount of moisture present in the cell cavity during the treatment of the method affects the influx of the preservative.
For this reason, the moisture content of wood raw materials is an important aspect of quality control.
For water-soluble preservatives, the water content of the treated sawn wood should be in the lower range (15% to 25%) so that the preservative can easily enter and chemically react on the cell wall. If there is excess water in the cells, the rebound pressure will expel the preservative from the cells once the treatment pressure has subsided.
In order to enhance the penetration of wood preservatives, an adjustment procedure is applied to reduce the moisture content of the wood. The method may be air drying, kiln drying or steaming and vacuuming in a processing cylinder, or boiling the treatment solution under vacuum.
In order to avoid the release of excess chemicals after treatment, time should be allowed at the manufacturing site to allow the chemicals entering the wood cell wall to be fixed. Once the fixation phase is over, the water-soluble preservative is chemically adsorbed on the cell wall.
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