Effect of the Sericite Mica on Paper Properties.
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概要
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Sericite, a fibrous variety of muscovite, was ground and classified by average particle size, ranging from 0.385 μm to 14.96 μm. In this report, the effect of these classified sericites on paper properties, such as tensile strength, smoothness, opacity and flame retardancy etc. was evaluated.<BR>Tensile strength of sericite paper was compared with papers containing phlogopite, and calcium carbonate. The strength reduction in breaking length was greater with small particle size of fillers than with large ones. No effect of the shape of the filler, flaky or not, on the strength reduction of paper could be found.<BR>The smoothness and opacity of the papers with smaller fillers were better than with larger ones.<BR>Comparison was made on flame retardant of papers containing sericite with different particle size by the method of limited oxygen index (LOI). Papers, which contain more than 50 wt% of the smallest sercite (0.385 μm), showed self-extinguishing. However, in order to be self-extinguishing, the papers containing sericites larger than 2 μm, required filler content of more than 75 wt%.
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