Outdoor anticorrosive wood flower box, square commercial flower box placement, anticorrosive wood flower box manufacturer customization

Outdoor anticorrosive wood flower box, square commercial flower box placement, anticorrosive wood flower box manufacturer customization

Knowledge of wood-the effect of wood moisture content on strength and shrinkage. Another characteristic of wood is that the value of moisture content directly affects the strength and volume of wood. Wood moisture content is the ratio of the moisture content of wood to the dry weight of wood. For the moisture content, take a piece of wood and weigh it, assuming that it is 4.16Kg, dry it to an absolute dry state, and weigh it again 3.4Kg, then the dry weight of this wood is 3.4Kg, and the moisture content is 4.16 3.4 = 0.76Kg. The moisture content of this wood is: moisture content (w%) = (weight of water-containing wood-weight of dry wood) / (weight of dry wood) x100% = 0.76 / 3.4x100% = 22.3% Filled with water, the moisture content of the wood is more than 100%. When the site is stacked, the water in the cell cavity evaporates first. At this time, the total weight of the wood is reduced, but the volume and strength have not changed. At a certain time, the water in the cell cavity has evaporated, but the cell wall is still full of water. This condition is called "fiber saturation". This is a moisture content of about 30%. For convenience, the 30% moisture content is defined as the "saturation point of the fiber". The water contained in the cell wall continues to evaporate, causing changes in the cell wall. At this time, not only the weight of the wood is reduced, the volume also begins to shrink, and the strength begins to increase. Wood strength varies with water content bec

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