WOOD RESEARCH Volume 61, Number 5, 2016
Yuxia Chen, Shiliu Zhu, Yong Guo, Shengquan Liu, Daowu Tu, and Hui Fan

Investigation on withdrawal resistance of screws in reconstituted bamboo lumber

The objective of this study was to evaluate the effects of screw diameter, pilot hole diameter, screw type and loading rate on the withdrawal resistance of some screws in reconstituted bamboo lumber (RBL) and comparison of screw withdrawal resistance in RBL with MDF and Particleboard. Results indicate that there were no significant differences among withdrawal resistance with screw diameter, screw type and loading rate. Significant differences were found between withdrawal resistance with pilot hole diameter. Screw withdrawal resistance decreased with increasing pilot hole diameter. Suggested size of pilot hole is 60-85 % of the nominal screw diameter. The withdrawal resistances in the face and edge of RBL are greater than the end direction. This reveled RBL is anisotropic. Face and edge withdrawal resistances of screws in RBL were higher as compared with those of MDF and particleboard. This indicates that withdrawal resistance of RBL meets the requirements of furniture structure design.

WOOD RESEARCH Volume 63, Number 6, 2018
Yong Guo, Shiliu Zhu, Yuxia Chen, Shengquanliu, and Qiqiqin

Contrastive analysis of screw withdrawal resistance between bamboo oriented strand board and conventional particleboard

Effects of screw diameter, pilot hole diameter, and material’s anisotropy on the withdrawal resistance of bamboo oriented strand board (BOSB) has been evaluated and the results has been compared with conventional particleboard (CPB). Results indicate that the effects of screw diameter on the face withdrawal resistance in BOSB have significant differences, whereas the edge withdrawal resistance was not. In contrast, the effect of screw diameter on face and edge withdrawal resistance in CPB has been statistically significant difference. The effect of pilot hole diameter on the face and edge withdrawal resistance both in BOSB and CPB has significant difference, the withdrawal resistance decreased as related to increasing pilot hole diameter. Furthermore, the withdrawal resistance in BOSB is anisotropic, whereas the relative superiority is sorted by the face, edge and end in turn. In addition, the withdrawal resistance in BOSB was much higher than CPB in all directions.