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Analysis of wood weight, volume and water content

source:未知 edit:admin time:2017-08-12
The weight of the wood is also a physical property of the wood, depending on the wood material, the air in the wood, the permeate and the moisture contained. "China's main tree species of wood physical and mechanical properties," a book attached to the provisions of the wood dry air density (g / cm, moisture content of 15%) as the standard, the weight of China's wood is divided into five: very light (<0.351 ), Light (0.351 ~ 0.550), medium (0.551 ~ 0.750), heavy (0.751 ~ 0.950 and very heavy (> 0.950). Macro recognition can be used to try the severity or placed in the water to observe its ups and downs. Of the volume table, is based on the current national standard GB4814-84 "logs table", GB4815-84 "fir of the original volume table", GB449-84 "saw the amount of timber" projections for the various departments Timber distribution, timber inspection and other personnel for the rapid determination of the cumulative number of various types of wood.
 
 
 
Wood volume is the same or similar, and the weight of the wood varies greatly in recent years in China from Africa and other countries in the wood encountered more and more, because the moisture content of wood caused by different. As we all know, the wood is mainly the stem part of the plant. Plant cells are composed of cell walls and cell lumens. Most of the wood cavity cavity is cavity, a small part of the cell cavity is gum, invasion, resin and other substances filled. The wood cell walls are mainly composed of cellulose, hemicellulose and lignin, and the moisture in the wood includes the presence of free water in the cell cavity and the presence of bound water (or sorption water) in the cell wall. Between the free water and the wood is the intermolecular force combination (with our usual water cup in the same water quality). Because cellulose, hemicellulose and lignin have a large amount of free hydroxyl groups, the combined water and wood cell walls are predominantly hydrogen bonded. Under normal conditions of wood and its products, there will be a certain amount and moisture.
 
China's wood moisture content and the weight of dry wood after the percentage of weight, defined as the wood moisture content.
 
Wood volume is the same or similar, and the weight of the wood varies greatly in recent years in China from Africa and other countries in the wood encountered more and more, because the moisture content of wood caused by different. As we all know, the wood is mainly the stem part of the plant. Plant cells are composed of cell walls and cell lumens. Most of the wood cavity cavity is cavity, a small part of the cell cavity is gum, invasion, resin and other substances filled. The wood cell walls are mainly composed of cellulose, hemicellulose and lignin, and the moisture in the wood includes the presence of free water in the cell cavity and the presence of bound water (or sorption water) in the cell wall. Between the free water and the wood is the intermolecular force combination (with our usual water cup in the same water quality). Because cellulose, hemicellulose and lignin have a large amount of free hydroxyl groups, the combined water and wood cell walls are predominantly hydrogen bonded.
 
Therefore, the 20-foot container filled with African hedgehog rosewood rough saw Fang, for example, due to its different moisture content, the corresponding weight of the wood mostly between 20 tons to 27 tons, and its corresponding wood volume mostly in 16m3 to 17m3 (Ie, the average volume of 16.5m3) between. In fact, the same size of the container filled with the same area, the same species, similar specifications, different moisture content of wood, although its corresponding weight changes, but the volume of the volume is relatively stable.
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