There are hundreds of wood rot fungi in the world that erode various woods that are in use, causing the decay of wood. The decay of wood often presents cracks and fibers. Dimensions, mesh holes, etc. lose the value of wood.
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 More than 200 kinds of soft rot fungi will cause soft use of ordinary wood that has been immersed in water for a long time and in contact with the soil for a long time, resulting in loss of use value. Wood fiber The sugar in the sugar can attract bacteria to erode the wood and rot. At the same time, organic substances such as hemicellulose and lignin contained in wood will provide good living for insects. Save the environment and erode it. In addition, physical and chemical factors in the outdoor environment directly or indirectly affect the untreated ordinary wood, such as weathering, deformation, discoloration and the like.
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 A serious flaw in wood is decay. The wood is under corrosive conditions and can be destroyed in 3 to 5 years. If it is handled well, it can be rotted for a long time. For example, the wooden structure of the millennium or more left over from ancient China is proof. The cause of wood decay is the damage of wood rot fungi, a minimal plant.
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Reproduction conditions of wood rot fungi: 1 , air; 2 , water, wood rot fungi secreted enzymes using water as a medium to decompose the wood itself into sugar for nutrition, the wood moisture content is the most decaying when 30% ~ 50% ; 3 , temperature 10 ~30 . For example, the pile is completely immersed in water, and the water content is more than 100% , so it is extremely rot, which denatures the wood and loses its physical properties.
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The most important method of preserving wood is to reduce the water content. Under the general moisture content of 18%, the wood rot fungus cannot be propagated. At the same time, to make the wood place ventilation, avoid Protect from moisture. If the ventilation is not good, the same humidity of the air is maintained at 80% to 100% , and the wood rot fungus can grow. For direct damp wood products to be coated or soaked with preservatives, the preservatives are toxic, so that wood rot fungi can not breed and survive. The most commonly used preservative is coal tar.
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