In pressure treatment methods for wood, both initial and final vacuum steps are applied to effectively treat the wood with chemicals and remove air from the wood cells.
The role of the initial vacuum is to create a vacuum environment within the treatment vessel. This is done to remove as much air from the wood cells as possible before introducing the treatment chemicals. By applying vacuum, the air is drawn out, creating more space within the wood cells. This prepares the wood for better chemical penetration and absorption during the subsequent pressure treatment.
The initial vacuum also helps to remove moisture from the wood, reducing the amount of water present within the cells. This is important as excess moisture can hinder the absorption of treatment chemicals and compromise the effectiveness of the wood treatment process.
Once the initial vacuum phase is complete, the treatment chemicals are introduced into the vessel while the vacuum is maintained. This allows the chemicals to fill the available space within the wood cells, ensuring thorough penetration and absorption. As the vacuum is maintained, air and moisture are continuously drawn out, enabling better contact between the chemicals and the wood for an effective treatment.
After the wood has been adequately impregnated with the treatment chemicals, the final vacuum is applied. This step is crucial to remove excess chemicals from the wood surface and pores. By applying vacuum, any excess chemicals that have not been absorbed by the wood are drawn out, reducing the risk of surface residues and enhancing the final appearance of the treated wood.
Moreover, the final vacuum helps in minimizing leaching once the treated wood is removed from the treatment vessel. Leaching refers to the release of treatment chemicals from the wood surface over time, which can impact the environment and pose potential health risks. By applying vacuum, any remaining chemicals that might be prone to leaching are removed, ensuring a safer and more environmentally friendly end product.
Overall, the application of both initial and final vacuum steps in wood treatment helps to create a controlled and efficient process that maximizes chemical penetration, minimizes surface residues, and reduces the risk of leaching.
in pressure treatment methods for wood both initial and final vacuum are applied . clarify role of applying initial and final vacuum in wood treatment
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