Wood is elastic, and it can bend within the normal stress range, and will return to its original state after the stress is released; If the stress limit is exceeded, the fiber will be permanently deformed and split. The common method of wood with small bending radius is to cook the wood with steam or boiling water or bury it in hot sand to change its fiber characteristics and increase its flexibility, and fix it in a fixture in time until the fiber cools and dries.
A long time ago, people used fire to bend wood, but it was limited by tree species and bending radius, which was far from meeting people's needs. Since 1830 Michel Sonett invented the method of cooking to soften wood bending, wood bending technology has made great progress. In recent years, people have done a lot of research on wood bending properties, tree species, wood softening technology and drying and setting methods, and made a lot of progress.