Method 1: antiseptic wood processing soaking method
Under normal temperature and pressure, the wood is immersed in the tank or pool containing preservative solution, and the wood is always below the liquid level. The soaking time depends on the tree species, wood specifications, moisture content and the type of chemicals. The specific soaking time is subject to the specified amount of chemicals and penetration.
In order to improve the treatment effect, ultrasonic wave, heating device and surfactant can be set in the soaking solution to improve the permeability of wood. Depending on the soaking time, the soaking method can be divided into instantaneous soaking (time from seconds to minutes), short-term soaking (time from minutes to hours) and long-term soaking (time from hours to one month). Suitable for veneer and remedial preservative treatment, as well as temporary wood.
Method 2: antiseptic wood processing diffusion method
According to the principle of molecular diffusion, with the help of water in wood as the carrier of agent diffusion, the agent diffuses from high concentration to low concentration, and diffuses to the deep layer of wood. Therefore, the wood treated by diffusion method must have the following conditions:
1. The moisture content of small wood is high enough, usually more than 35% - 40%, and the raw wood is good;
2. The water-borne agent (diffusion type) has high solubility and slow solidification;
3. The environment temperature and humidity are high. According to the operation process, the diffusion method can be divided into paste diffusion method, impregnation or spray diffusion method, binding diffusion method, drilling diffusion method (or drop diffusion method) and double agent diffusion method. The diffusion process has less equipment investment and simple production process. It is easy to be applied and popularized in rural areas. Similar to this method is the sap replacement method.
Method 3: antiseptic wood processing - hot and cold trough
Based on the principle of heat expansion and cold contraction, the gas in the wood is heated and cold contracted to produce pressure difference, so as to overcome the penetration resistance of the liquid, that is, to heat the wood in the hot liquid. The pressure inside the wood is higher than the atmospheric pressure, and the air and water vapor overflow to the outside
At this time, the wood is quickly placed in a relatively cold liquid, the wood is suddenly cooled, the air in the wood generates negative pressure due to shrinkage, and the cold liquid seeps into the wood. According to the treatment method and the configuration of cold tank, it can be divided into two tank alternating method, single tank hot and cold liquid alternating method and single tank cooling method. Due to the low efficiency (compared with the pressure method) and high energy consumption per unit product, it is generally used in small batch of wood preservative treatment.