大片刨花形态对可饰面定向刨花板力学性能的影响

Influence of large strands shape on mechanical properties of decorative OSB

【目的】探究大片刨花形态对可饰面定向刨花板力学性能的影响,为可饰面定向刨花板的生产原料筛选提供依据。【方法】以杨木大片刨花为试验材料,以刨花板力学性能为考察指标,选择大片刨花长度(70~230 mm)、宽度(10~58 mm)、厚度(0.3~1.1 mm)为影响因素,通过单因素试验研究刨花三维尺寸对所制备可饰面定向刨花板静曲强度(MOR)和内结合强度(IB)的影响,在此基础上运用Box-Behnken响应面法,以可饰面定向刨花板的静曲强度和内结合强度为响应值,以刨花的长(110,150和190 mm)、宽(34,46和58 mm)、厚(0.3,0.5和0.7 mm)3个因素为自变量,设计三因素三水平正交旋转组合试验,对大片刨花三维尺寸组合进行优选。【结果】单因素试验表明,大片刨花三维尺寸对板材的力学性能均有较大影响。大片刨花长度为150和110 mm时,板材的静曲强度、内结合强度分别达到最大值,为17.61和0.63 MPa;大片刨花宽度为46和34 mm时,板材的静曲强度、内结合强度分别达到最大值,为17.05和0.67 MPa;大片刨花厚度为0.5和0.7 mm时,板材的静曲强度、内结合强度分别达到最大值,为24.65和0.62 MPa。三因素三水平正交旋转组合优化试验表明,静曲强度和内结合强度回归模型的拟合系数R2分别为0.9915和0.9443,大片刨花长度和厚度对静曲强度的影响分别达极显著水平(P<0.01)和显著水平(P<0.05),对内结合强度的影响均达到极显著水平(P<0.01);交互作用分析表明,大片刨花长度与厚度、宽度与厚度的交互作用均对静曲强度有显著影响(P<0.05),长度与厚度的交互作用对内结合强度有显著影响(P<0.05)。【结论】最优的大片刨花形态参数为长140 mm、宽40 mm、厚0.5 mm,在该条件下制备的可饰面定向刨花板的静曲强度为20.31MPa,内结合强度为0.49 MPa。

【Objective】This study explored the influence of large strands shape on mechanical properties of decorative OSB to provide reference for the research and development of decorative OSB.【Method】Poplar wood strands were used as the test material,and the mechanical properties of OSB were used as evaluation indexes.The length(70-230 mm),width(10-58 mm)and thickness(0.3-1.1 mm)of strands were selected as influencing factors.The effects of three-dimensional particle size on modulus of rupture(MOR)and internal bonding strength(IB)of decorative OSB were studied by single factor tests.Then,the Box-Behnken response surface method was used to design the three-factor and three-level orthogonal rotation combination tests using length(110,150 and 190 mm),width(34,46 and 58 mm)and thickness(0.3,0.5 and 0.7 mm)of the strands as independent variables.The MOR and IB of decorative OSB were used to optimize the size combination of large strands.【Result】The results of single factor test showed that the three-dimensional size of large strands had great influences on the mechanical properties of boards.When the length of large strands was 150 and 110 mm,the MOR and IB reached the maximum values of 17.61 and 0.63 MPa,respectively.When the width of large strands was 46 and 34 mm,the MOR and IB reached the maximum values of 17.05 and 0.67 MPa,respectively.When the thickness of large strands was 0.5 and 0.7 mm,the MOR and IB reached the maximum values of 24.65 and 0.62 MPa,respectively.The results of three-factor and three-level orthogonal rotation optimization showed that the fitting coefficients R2 of MOR and IB regression models were 0.9915 and 0.9443,respectively.The length and thickness of large wood shavings had extremely significant(P<0.01)and significant(P<0.05)effects on MOR,respectively,and they both had extremely significant(P<0.01)effects on IB.The interaction analysis showed that the length and thickness interaction and the width and thickness interaction of large strands had significant influences on MOR(P<0.05),and the length and thickness interaction had significant impacts on IB(P<0.05).【Conclusion】The optimal shape parameters of large strands were 140 mm in length,40 mm in width and 0.5 mm in thickness,and the MOR and IB of obtained decorative OSB were 20.31 MPa and 0.49 MPa,respectively.