The method is to soak the wood in 50% urea aqueous solution, soak the wood with a thickness of 25mm for 10 day, dry it at a certain temperature until the water content is 20%~30%, and then heat it to 100℃ for bending, drying and setting.

The method of processing curved wood with chemicals can fully soften the wood, which is not limited by tree species, but it will produce defects such as discoloration and collapse of wood.

Other methods of wood softening:

1, liquid ammonia treatment method

Soak air-dried or absolutely dried wood in liquid ammonia at 33~78℃ for 0.5~4h, and then take it out. At this time, the wood has softened. After bending for a certain period of time, let it stand for a certain period of time to evaporate all ammonia, which can stabilize its deformation and restore the hardness of wood. When treated at room temperature, the wood is easy to deform in only 8~30min, and the veneer with a thickness of 3mm can achieve enough plasticity and can be bent at will.

2, gaseous ammonia treatment method

Air-dried wood with water content of 10%~20% is put into a treatment tank, and saturated gaseous ammonia (about 10 atmospheric pressure at 26℃ and about 5 atmospheric pressure at 5℃) is filled for treatment for 2~4 hours (the specific time depends on the thickness of the wood). Bending wood softened by this method has worse solidification performance than bending wood treated with liquid ammonia.