A STUDY ON SURFACE AND BULK OF PAPER

涂布纸与涂布纸之间的摩擦结果总结如下。在混合颜料涂料中，PCC与粘土的比例越高，其静态COF和动态COF越高。颜料颗粒大小顺序的微观粗糙度被认为与之有关，因为PCC的立方体形状的颗粒抵抗滑动。压延降低了PCC用量较大时的COF，但对单一粘土配方的COF没有任何影响。GCC的加入降低了COF。富含GCC配方的动力学COF随滑动次数的增加而下降的速率高于富含聚碳酸酯的配方，这可能是由于富含GCC配方的部分突出，表面被选择性地扁平所致。添加SB胶乳至14PPH时，COF有所下降，但静态COF在18PPH时最高。作为橡胶的SB-胶乳的防滑性能仅在静态模式下发展。在所使用的润滑剂中，蜡型润滑剂降低COF值最显著，…的影响更大动态COF比静态COF多，用水银浮力法准确测量孔隙率和密度的结果如下：研究发现，粗糙纸的“水银”厚度低于“微米”厚度，这是因为水银填充了表面的凹痕，而对于A2涂层纸，两者的厚度非常接近。涂层孔隙率随胶乳含量的增加而降低。准确度约为1%。添加羧甲基纤维素(CMC)的涂布的孔隙率大于添加聚乙烯醇(PVA)的涂布的孔隙率。在涂布纸生产过程中，水溶性聚合物对SB胶乳迁移的影响结果如下。CMC、纤维素酸和羟乙基纤维素等纤维素衍生物抑制了胶乳的迁移。原因不是离子电荷或粘度，而是这些聚合物在分子水平上的线性链结构。据预测，它们在颜料颗粒和被困在其中的乳胶颗粒之间形成了一个松散的网络结构。较少

Results of coated paper-to-coated paper friction were summarized in the followings. Higher PCC ratio to clay in mixed pigment coatings resulted in higher static and kinetic COFs. Micro-roughness in the order of pigment particle size is considered to relate to it, as cube-shaped particles of PCC resist sliding. Calendering decreased COF at larger amounts of PCC, but did not change at all COF of the sole clay formulation. Addition of GCC decreased COF. The rate of decrease in kinetic COF with increasing the number of sliding for the GCC-rich formulation was higher than that for the PCC-rich formulation, presumably because protruding parts ; characteristic of the GCC-rich formulation, in the surface was selectively flattened. Addition of SB-latex up to 14 pph decreased COF, but static COF had the highest value at 18 pph. An anti-slip property as a rubber of SB-latex developed only in the static mode. Among lubricants used, the wax type decreased COF the most remarkably with more effects o … More n kinetic COF than on static COF.Results of exact porosity measurement and density measurement by the mercury buoyancy method were summarized in the followings. It was found that "mercury" thickness was lower than "micrometer" thickness for rough papers because mercury filled dents in surfaces, but for an A2 coat paper, the two of the thickness were very close. Porosity of coatings was found to decrease with increasing latex content. The degree of accuracy was approximately 1%. The porosity of coatings with carboxymethyl cellulose (CMC) was larger than that with polyvinyl alcohol (PVA).Results of effects of water-soluble polymers on SB-latex migration in the process of coated paper production were summarized in the followings. Cellulose derivatives like CMC, cellouronic acid, and hydroxyethyl cellulose suppressed latex migration. The reason is not ionic charge or viscosity, but linear chain structure of those polymers at a molecular level. It was predicted that they formed a loose network structure between pigment particles and trapped latex particles inside it. Less