深冷处理对桦木胶合板抗弯强度和握钉力的影响

The effect of ultra-low temperature treatment on the bendings and withdrawal strength of birch plywood

运用液氮深冷-室温-深冷循环处理和连续液氮深冷处理两种方式对桦木胶合板进行处理,并对处理前后桦木胶合板的抗弯强度和握钉力进行了对比研究,旨在为桦木胶合板在LNG船绝缘箱上的应用提供理论基础。结果表明:随深冷处理时间的延长,桦木胶合板MOE缓慢降低;连续深冷处理后在冷态下测定的桦木胶合板抗弯强度要高于未处理对照样,而深冷-室温-深冷循环处理较连续深冷处理对桦木胶合板的力学性能影响大;深冷处理后握钉力有所下降。

The bending strength of birch plywood with the cycle of room temperature-ultra low temperature treatment and the continuous ultra-low temperature treatment was studied. The aim is to provide the theoretical basis for the application of LNG insulate box. The result showed that the MOE of birch plywood was slowly decreased with increasing of treatment time. The bending strength of birch plywood at ultra low temperature treatment was higher than that of control plywood. The cycle of room temperature-ultra low temperature treatment has the great negative effect on the bending strength of birch plywood than continuous ultra-low temperature treatment. Moreover, the withdrawal strength of birch plywood was decreased after ultra low temperature treatment.