| 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. |
