The former editor taught you how to deal with the cracks that corrode the wooden table, but didn't explain in detail how the cracks formed. So today, Xiaobian will explain in detail why there are cracks on the wood table, so that we can understand the causes of the cracks on the wood table more clearly, so that when dealing with the cracks on the wood table in the future, it will be more accurate.
Surface crack: refers to surface crack. Surface crack refers to the crack on the surface of wood or finished wood. Cracks are usually confined to the chordal plane and develop radially. Shallow cracks can be removed by planing, but deep cracks are not only beautiful, but also reduce the strength of wood, especially the shear strength. The surface crack will also affect the paint quality of anticorrosive wood. When there are cracks on the surface of wood paint, due to the change of climate conditions, the cracks will open or close, causing the paint film to break. The reason of wood surface crack is uneven drying inside and outside, and the difference of radial shrinkage and chord shrinkage is an important additional factor.
After the preservative wood is dried, the moisture is evaporated from the surface first. When the surface moisture content decreases below the fiber saturation point, the surface wood begins to contract, but the moisture content of the adjacent inner wood is still above the fiber saturation point and does not contract. The shrinkage of the surface wood is limited by the internal wood, which can not shrink freely, thus causing the internal stress of the wood: the surface wood is pulled, and the internal wood is pressed. The stronger the drying condition, the greater the difference of moisture content and the greater the internal stress. If the tensile stress on the surface exceeds the transverse tensile strength of the wood, the wood tissue will be torn. Because the tensile strength of the tissue along the wood ray is smaller than that of the adjacent wood fiber, the crack first occurs along the wood ray.
Therefore, the main factor leading to the cracking and corrosion of the wooden table can be said to be the cracking of the wooden table caused by improper production and processing, and this problem can not be determined by the user. In order to avoid this kind of situation, everyone is choosing this wood, and must carefully choose, so as to choose high-quality wood, and even do a good job of maintenance in the later stage of use at the same time, so as to avoid the problem of wood cracking to a greater extent.