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纸张涂层的机械性能在加工和印刷操作中是非常重要的,其中包括挺度、耐折度及抗掉粉掉毛性等。以高岭土为基础的涂层不同于那些以研磨碳酸钙(GCC)为基础的涂层,这是因为其天然的片状粒子使得纸张在x、y和z向上有不同的机械性能。该研究为了表征高岭土颗粒长径比的影响,制备了无支撑涂层,并检测了其面内拉伸性能。并将其与涂有同样高岭土的中试涂布纸进行了比较。研究表明,含较大长径比的细小高岭土涂层比只含有GCC涂层的弹性模量大7～8倍。若有合适的黏合体系,这些涂层可以与原纸有同样大小的模数。这表明能充分地利用这些优势增加纸张的挺度或降低其定量,以此来降低成本并保证纸张的挺度。
The mechanical properties of paper coatings are important in processing and printing operations, including stiffness, endurance, and lint resistance. Kaolin-based coatings differ from those based on ground calcium carbonate (GCC) because their natural flaky particles give the paper different mechanical properties in the x, y, and z directions. In order to characterize the effect of the aspect ratio of kaolin particles, an unsupported coating was prepared and its in-plane tensile properties were measured. It was compared with the pilot coated paper coated with the same kaolin. Studies have shown that the fine kaolin coating with larger aspect ratio is 7 to 8 times more elastic than the GCC coating alone. With the proper bonding system, these coatings can have the same modulus as the base paper. This shows that these advantages can be fully utilized to increase or decrease the stiffness of the paper to reduce costs and ensure the stiffness of the paper.