Three processing parameters (air gap, bath temperature and drawing speed) were chosen as major factors. Orthogonal experiments of the three factors and four levels were designed to study the influence of processing parameters on mechanical properties of cellulose films. The results show that the most critical factor is bath temperature, the second is drawing speed and air gap. The optimum processing conditions for film making should be 32 mm air gap,20 ℃ bath temperature, and 500 mm/min drawing speed. The tensile strength and elongation at break of the cellulose films prepared in the optimum processing parameters are 13.68 MPa and 79.37%, respectively. The degrees of crystallinity of different mechanical properties (optimal combination, the best and worst ones in the orthogonal design) of cellulose films are 63.27%, 72.7% and 54.74%, respectively. The cross-sections of cellulose films prepared in the optimum processing parameters displayed a more homogeneous and compact structure.%选择气隙高度、凝固浴温度、拉伸速度3种工艺参数作为研究对象,并设计3因素4水平的正交实验来分析制膜条件对纤维素膜力学性能的影响.通过结果分析得出:影响纤维素膜力学性能的主要因素为凝固浴温度,其次为拉伸速度以及气隙高度.最优的制膜条件为:气隙高度32 mm,凝固浴温度20℃、拉伸速度500 mm/min.最优组合所得纤维素膜拉伸强度为13.68 MPa、断裂伸长率为79.37％.对最优组合、正交表中综合评分最高值与最低值3种试样进行结晶度与断面结构的对比,结晶度分别为63.27％、72.7％、54.74％,在膜断面结构方面,最优组合膜较另外两者呈现出更均匀且致密的断面结构.
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