Wood drying is a relatively complex process, and many aspects need to be paid attention to.
Wood drying is a relatively complex process. There are many specifications, varieties and uses of wood. Each enterprise needs to work out a drying process that suits its own products according to its own production characteristics. Thereby ensuring the dry quality of the wood.
1. Stacking
1. The sawn timber to be dried in the same kiln should be of the same tree species, the same thickness, and basically the same initial moisture content. Generally, mixing is not allowed.
2. The wood spacer is generally determined according to the thickness of the dried wood. The width of the cross-section is between 3-5 cm. The wood with a thickness of 4 cm generally uses a spacer with a thickness of 2.5 cm, and the wood with a thickness of more than 5 cm is generally used. 3 cm A centimeter thick spacer with a length equal to the width of the stack. It is made of tree species with good impact toughness and strength with straight texture and no defects such as knots and skins. The spacing of the spacers: the pile of coniferous wood is generally 18-20 times the thickness of the board, and the pile of hardwood is generally 10-12 times the thickness of the board, which can be flexibly controlled according to the thickness of the dried sawn timber. The spacers should be aligned up and down to form a vertical line, and cannot be staggered, otherwise the sawn timber will be easily bent and deformed.
3. The longitudinal direction of the sawn timber is perpendicular to the airflow direction, and the spacers are consistent with the airflow direction, so that the circulating airflow can smoothly flow through the horizontal air passages in the stack.
4. The spacer at the end of the pile should clamp the end of the board, and the ends of the pile and the pile should be as close as possible, and should be aligned with the inner wall of the drying room as much as possible, so as to prevent the ends from drying too fast and causing end cracks.
5. The sawn timber should be laid flat in a single layer, close to each other, and should not be stacked together in two layers. The pile of timber must be installed in a regular hexahedron, not skewed or skewed. If the length of the sawn timber is inconsistent, try to leave the vacancy in the pile. Keep the ends flush.
6. After the timber is stacked, it is necessary to press heavy objects along the spacer on the top of the stack to prevent or reduce the deformation of the sawn timber. Special reinforced concrete strips with a cross-section of 100×100mm or waste wood can be used to pressurize the top.
7. On both sides of the pile (non-end side), a vertical airway should be left about 50 cm away from the wall.
