Analysis of strand characteristics and alignment of commercial OSB panels

作者：Chen Siguo^*; Du Chungui; Wellwood Robert

来源：Forest Products Journal, 2008, 58(6): 94-98.

Due to the highest stresses occurring at the surfaces of a panel in bending, the alignment of strands at the surface layers is crucial to the bending strength and stiffness of oriented strandboard (OSB). A study was carried out to analyze the geometric characteristics and orientation of strands on the top surface of a commercial 12- by 24-ft (3.66- by 7.32-m) OSB master panel. A large quantity of accurate data was obtained by combining digital imaging and manual identification of strand vertices for the entire master panel surface. The result of analysis shows that only 43 percent of measured strands were oriented within 20 degrees from the strength axis, indicating considerable room for improvement. Influence of strand length, width, aspect ratio (that is, strand length divided by its width) and area on strand orientation was investigated. Strand length was identified as the dominant factor that directly affected strand orientation. Strand width, aspect ratio, and area affected orientation indirectly mainly through their association with strand length. Aspect ratio did not appear to be well correlated with strand orientation. Analyzing the variation of strand orientation across the width of the master panel enabled identification of localized disorientation associated with poor conditions of the orienter disks. The methodology developed in this study can be used to help OSB producers improve strand alignment by accurately evaluating the effectiveness of strand alignment in OSB mat formation.

• 出版日期2008-6
• 单位浙江农林大学