基于X射线断层扫描技术的涂布纸张三维结构表征

Three-dimensional Structure Characterization of Coated Paper Based on X-ray Computed Tomography

关键词:  X射线 CT  涂布纸张  三维结构表征  孔隙结构  表面形貌

Key Words:X-ray CT  coated paper  3D structure characterization  pore structure  surface morphology

摘要:本研究以X射线断层扫描（CT）为测试手段，结合数字图像处理技术，建立了表征纸张孔隙结构和表面形貌的方法，研究了涂布对纸张三维结构的影响，从结构角度阐释了涂布影响纸张性能的内在机理。结果表明，涂布后纸张的孔隙率、孔径和配位数减小，孔隙迂曲率升高，使得流体流经孔隙时的阻力增大从而增加其阻隔性；另外，涂布还改变了纸张的表面微观形貌，使纸张表面轮廓均方根偏差降低，减小纸张表面起伏，提高纸张平滑度。基于X射线CT技术对涂布纸张进行三维结构表征有助于明晰纸基材料结构与性能之间的关系，推动新型纸基材料的研发。

Abstract:In this study， X-ray CT was used as a testing method， combined with digital image processing technology， to establish a method for characterizing the pore structure and surface morphology of paper. The effects of coating on the three-dimensional structure of paper were studied， and the internal mechanism of coating affecting paper properties was explained from a structural point of view. The results showed that after coating， the porosity， pore size and coordination number of paper decreased， while the pore tortuosity increased， which increased the resistance of fluid flowing through pores and thus increased its barrier property. Coating also changed the surface micro-morphology of paper. The root mean square deviation of surface profile lines decreased， and the undulation of paper surface decreased， which improved the smoothness of paper. The three-dimensional structural characterization of coated paper based on X-ray CT technology helped to clarify the relationship between the structure and performance of paper-based materials， and promoted the development of new paper-based materials.