The intrinsic factors that affect the drying of fir wood piles are as follows:

1. Tree species and structural characteristics

The species of fir wood piles have different structures, such as the size and number of pits. Therefore, the difficulty of water moving along the corresponding path will also be different. Generally, hard broad-leaved forest hoses and pits with ring holes are different. There are many fillers in the medium and the diameter of the micropore plate on the pit membrane is small, so its drying rate is significantly lower than that of diffuse-pore broadleaf trees. In addition, the greater the relative density of the tree species, the slower the drying rate will be.

2. Thickness of fir wood pile

The basic drying process of fir wood piles is mainly conduction and convection heat transfer along the thick side. As the thickness increases, the conduction and convection heat transfer distance will be lengthened, the friction resistance will naturally increase, and the relative drying rate will decrease.

3. Moisture content of fir wood piles

Generally speaking, the lower the moisture content of fir wood piles, the slower the drying rate.

4. The heart sapwood of fir piles

The somatic cells of the heartwood of broadleaf trees contain more substances, and most of the pores in the heartwood of coniferous trees are blocked, so the heartwood is more difficult to dry than the sapwood.

5. The grain orientation of fir wood piles

Wood radiation is conducive to moisture transmission. The moisture transmission along the axial direction of the fir pile is about 15%-20% greater than along the chord direction. Therefore, chord-sawn boards generally dry faster than radial-sawn boards.

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