The twill of the saw blade is made out of the natural twill of the round material
Outdoor Floor Exporters Online , which is not reasonable, and the straight trunk will be processed into a twill blade, which is called the artificial twill. The effect of twill to material is mainly to reduce the strength of the wood, it is easy to crack when the twill is dry, it is easy to warp and reduce the strength when it is dry. (5) decay: wood by as a result of wood rotting fungi, gradually change its color and structure of the cell wall is damaged, the physical and mechanical properties changes,
finally become soft and fragile, mesh shape or powder shape, such as the state called rotten. Decadent seriously affect the physical and mechanical properties of wood, the most to reduce wood, increase water imbibition, intensity is reduced, especially late decadent,
wood strength one already close to zero, it does not allow to use in construction engineering in the rotten wood. (6) pulp heart: in the middle of the trunk transection and on the first ring part consists of vulnerable group of parenchyma cells, is in the shape of different mostly round or oval shape,
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