I believe everyone already has a certain understanding of fir piles, but many friends are still wondering why fir piles crack. Now you can follow the editor to find out.

Temperature: Temperature is the main factor that affects the drying speed of fir wood piles. As the temperature increases, the water pressure in the fir wood piles increases, and the viscosity of liquid free water decreases, which is beneficial to promoting the flow and dispersion of water in the fir wood piles; the dissolution of the copper wire drying medium The moisture content increases and accelerates the evaporation rate of water on the surface of the fir pile. However, it is worth noting that if the temperature is too high, it will cause cracking and deformation of the fir pile, reduce the mechanical strength, discoloration, etc., and should be appropriately controlled.

Humidity: Relative humidity is an important factor affecting the drying speed of fir wood piles. When the temperature and air flow speed are the same, the higher the relative humidity, the greater the partial pressure of water vapor in the medium, and the less likely it is for the moisture on the surface of the fir wood piles to evaporate into the medium. The slower the drying speed; when the relative humidity is low, the surface water evaporates quickly, the surface moisture content decreases, the moisture content gradient increases, the water dispersion increases, and the drying speed is faster. However, if the relative humidity is too low, drying defects such as cracking and honeycombing will occur. The problem has even worsened.

Air circulation speed: Air circulation speed is another factor that affects the drying speed of fir piles. High-speed airflow can destroy the full steam boundary layer on the surface of fir piles, thereby improving heat transfer and mass transfer conditions between the medium and fir piles, and accelerating the drying speed. .For difficult-to-dry wood or when the moisture content of the fir pile is low, the internal moisture movement of the fir pile determines the drying speed; it has no practical significance to accelerate the transpiration rate of surface moisture by increasing the medium flow rate, but will increase the moisture content gradient and increase the drying rate. The risk of drying defects is greatly increased. Therefore, difficult-to-dry materials do not require a high medium circulation speed.