机械木浆纤维形变性表征及其对纤维间结合性能的影响

The Characterization of Deformation Behavior of Mechanical Lignocellulosic Fibers and Its Effect on Interfiber Bonding Properties

关键词:  木浆纤维  形变性  结合性能  柔软性

Key Words:lignocellulosic fiber  deformation property  bonding property  flexibility

摘要:针对不同木素含量的纤维原料，采用不同评价方法对其形变性能进行表征，包括纤维柔软性（F）、纤维横截面纵横比（AR）和纤维压溃指数（CI）；同时围绕纤维形变性对纤维间结合性能以及手抄片物理强度的影响进行分析。结果表明，F、AR和CI都可以用来表征纤维的形变性，其中，当木素含量从24.28%减少到2.67%时，F表征的相对形变量为956.5%，数倍于其他两者，说明F这一指标表征的更为全面；随着F从0.516×1012 N^-1·m^-2增加到5.454×1012 N^-1·m^-2，纸张中纤维间的相对结合面积（RBA）和剪切结合强度（b）增大，Page结合强度指数从3.60 N·m/g线性增加到84.07 N·m/g；在纸张成形过程中，可以通过改变纤维形变性能调节纸张强度和松厚度之间的对立关系。

Abstract:In this study, the pine TMP was delignified with sodium chlorite under acidic conditions, to obtain pulp fibers with different lignin contents. The deformation properties of these fibers were characterized by different methods, including flexibility of fiber(F), aspect ratio of fiber cross section(AR) and deformation index of fiber(CI). Finally, the effects of fiber deformation behavior on the interfiber bonding properties and physical strength of handsheets were discussed in details. The results showed that the F, AR and CI could characterize the fiber deformation, when the lignin content decreased from 24.28% to 2.67%, the change of relative deformation characterized by F was 956.5%, which was several times greater than that characterized by the others, therefore, F was the most comprehensive characterization index among them; the increase of F from 0.516×1012 N-1·m-2 to 5.454×1012 N-1·m-2 contributed to the increase of the relative bonding area (RBA) and shear bond strength (b) of the fibers, which led to the linear increase of the Page bonding strength index from 3.60 N·m/g to 84.07 N·m/g. During the paper sheet forming process, the contradiction relationship between physical strength and bulk properties of the paper sheets could be alleviated by adjusting the deformation properties of fiber materials.