Wood cracks occur inside the wood and rupture along the […]
Wood cracks occur inside the wood and rupture along the wood rays, such as honeycombs, also known as honeycomb cracks. There is no crack on the outside, only sawing can be found. However, it is usually accompanied by unevenness or obvious shrinkage, or carbonization, or light weight.
This is a distinct feature of excessive dryness. Internal cracking generally occurs in the late stage of drying, which is caused by the serious surface hardening and the severe drying conditions in the later stage, which causes the internal tensile stress to be too large. Larger sawn timber, especially hard-boiled trees with high basic density, thick wood ray, or hard wood, such as eucalyptus, ash, kemu, eucalyptus, maple, and liu. Both are prone to internal cracking. Internal cracking is a serious drying defect that has an extremely adverse effect on the strength, material, processing and product quality of wood. It is generally not allowed to occur. The prevention method is to carry out intermediate treatment in the middle and late stages of the kiln drying to relieve the surface hardening. For thicker sawn timbers, especially hard broad-leaved trees, the post-drying temperature should not be too high.
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