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Wood deformation and cracking are major flaws in wooden furniture. While the causes of wood deformation and cracking are complex, they can be summarized into two main categories: internal and external. External factors are primarily caused by improper construction, so I won't go into detail here, focusing on the internal factors.
The main cause of cracking and deformation in wood panels is moisture content. To balance the moisture content of the furniture with that of the air, dry air continuously absorbs moisture from the furniture, thus achieving a balance between the two. This process naturally causes cracking and deformation.
After a wood product is completed, its shape and material remain unchanged. The key factors determining its intrinsic quality are its moisture content and drying stress. Therefore, it's crucial to accurately understand the moisture content of wood products. When a wood product reaches an equilibrium moisture content during use, it's least susceptible to cracking and deformation. This is also related to the region where the wood product is grown.
Appendix: Annual average values of wood equilibrium moisture content in major cities in my country
The core board and middle board are mainly made of native poplar wood (also known as "golden fir" in some markets) grown in the alpine forest areas above 45 degrees north latitude. It has a growth cycle of more than 30 years, high density, hard material, stronger nail holding force, and uniform water content. The core board of the board is steam kiln dried for at least 288 hours and then stored for more than 60 days to ensure that the moisture content of the board is evenly maintained between 12% and 14%. The static bending strength of the board surface is high, and it is one of the products with the lowest deformation rate in the domestic market.
Furthermore, the eco-friendly panels, featuring a double-center plate structure (this assembly process is patented, patent number: ZL 2015 2 1098787.6), undergo five hot-pressing cycles, fully evaporating the free formaldehyde within the panels and enhancing their environmental performance. This effectively releases internal stress, resulting in high static bending strength, structural stability, and resistance to warping and deformation.
For eco-friendly boards, moisture content also impacts their environmental friendliness. Data shows that as the moisture content of artificial boards increases from 3% to 10%, formaldehyde emissions increase. The R&D and Testing Center is the only company in my country's artificial board industry capable of testing boards for weather resistance and thermal cycling. This capability examines the impact of temperature and humidity fluctuations throughout the entire process, from transportation and storage to customer use, ensuring that board quality is unaffected by seasonal temperatures.
The National Building Materials Quality Supervision and Inspection Center sets a moisture content standard of 6.0%-14.0% when testing board products. Eco-board not only meets this standard, but also, according to authoritative testing, has a formaldehyde emission level of ≤0.3mg/L, exceeding the national E0 standard (formaldehyde emission ≤0.5mg/L).