Choosing optimum softening process and exploring the factors affecting dimensional stability and their changing laws can be able to provide technological support for development of curving furniture. The total rubber ...Choosing optimum softening process and exploring the factors affecting dimensional stability and their changing laws can be able to provide technological support for development of curving furniture. The total rubber wood samples were 112 [220 mm (longitudinal) × 17 mm (radial) × 8 mm (tangential)], and they were softened by boiling water and bent through using curved molds in the test. The optimum softening process was selected according to MOR value of the samples. Some affecting factors which influenced the dimensional stability of curving samples were investigated in the optimum softening process, including aging time, final moisture content of the samples, treatment time at a temperature of 100 ℃ and soaking time in water. The results indicate that the optimum softening process is as follows: softening temperature 112 ℃, saturation vapor pressure 0.16 MPa and softening time 3 h. All factors would affect the dimensional stability of curving samples, but the influence of soaking time in water was the most remarkable. When the aging time was 2 h and the final moisture content was 9.8%, the dimensional stability of the curving samples was the best. The chord change of the samples was great in the first 2 hours during heat treating process at a temperature of 100 ℃.展开更多
There are many advantages of bended wood, such as good-looking shape, simple process and low cost. The product, however, is easy to get recovery, which is urgent to be dealt with. This paper concludes the features of ...There are many advantages of bended wood, such as good-looking shape, simple process and low cost. The product, however, is easy to get recovery, which is urgent to be dealt with. This paper concludes the features of deformation and recovery of bended wood and wood-based composites and summarizes four treating methods to keep dimensional stability. Compared to bended solid wood, some elementary perspectives on the research of bended wood-based composites are presented. The purpose of this paper is to suggest： 1） to investigate the optimum heating time and temperature that bended wood and wood-based composites need from the formation of deformation to the recovery and to the permanent fixation, according to its changes of dimensional stability such as curvature radius; 2） to measure the composites comprised of wood and adhesives on the changes of stress relaxation, dynamic viscoelasticity and crystallization field; 3） to quantitatively analyze changes of the major components in wood cell wall polymers as well as the composites under heat/steam treatment and untreated conditions. It will be helpful for subsequent research to clarify on the mechanisms of permanent fixation of bended wood and also contribute to that of wood-based composites.展开更多
文摘Choosing optimum softening process and exploring the factors affecting dimensional stability and their changing laws can be able to provide technological support for development of curving furniture. The total rubber wood samples were 112 [220 mm (longitudinal) × 17 mm (radial) × 8 mm (tangential)], and they were softened by boiling water and bent through using curved molds in the test. The optimum softening process was selected according to MOR value of the samples. Some affecting factors which influenced the dimensional stability of curving samples were investigated in the optimum softening process, including aging time, final moisture content of the samples, treatment time at a temperature of 100 ℃ and soaking time in water. The results indicate that the optimum softening process is as follows: softening temperature 112 ℃, saturation vapor pressure 0.16 MPa and softening time 3 h. All factors would affect the dimensional stability of curving samples, but the influence of soaking time in water was the most remarkable. When the aging time was 2 h and the final moisture content was 9.8%, the dimensional stability of the curving samples was the best. The chord change of the samples was great in the first 2 hours during heat treating process at a temperature of 100 ℃.
文摘There are many advantages of bended wood, such as good-looking shape, simple process and low cost. The product, however, is easy to get recovery, which is urgent to be dealt with. This paper concludes the features of deformation and recovery of bended wood and wood-based composites and summarizes four treating methods to keep dimensional stability. Compared to bended solid wood, some elementary perspectives on the research of bended wood-based composites are presented. The purpose of this paper is to suggest： 1） to investigate the optimum heating time and temperature that bended wood and wood-based composites need from the formation of deformation to the recovery and to the permanent fixation, according to its changes of dimensional stability such as curvature radius; 2） to measure the composites comprised of wood and adhesives on the changes of stress relaxation, dynamic viscoelasticity and crystallization field; 3） to quantitatively analyze changes of the major components in wood cell wall polymers as well as the composites under heat/steam treatment and untreated conditions. It will be helpful for subsequent research to clarify on the mechanisms of permanent fixation of bended wood and also contribute to that of wood-based composites.
