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以PVA为施胶剂,碳酸钙为颜料配制施胶液,对证券纸进行表面施胶。系统地研究了颜料粒子粒径及其分布、施胶剂与颜料比例、施胶液固含量、施胶量对证券纸施胶层透明度的影响(透明度以透射率下降率TD表示,TD≤10%)。结果表明:随着颜料粒子的粒径变大,粒径分布变宽,颜料化比例增大,固含量增加,施胶量增加,施胶层的透明度呈降低趋势。当PVA:95GCC为10:1,施胶液固含量为5%,颜料粒子平均粒径为0.934μm,施胶量为1.0 g·m-2时,施胶层的透明度较好,透射率下降率为6.3%。
Using PVA as sizing agent and calcium carbonate as sizing agent, surface sizing of security paper was carried out. The particle size and distribution of pigment particles, the proportion of sizing agent and pigment, the sizing liquid solid content and sizing amount on the transparency of the sizing layer of the security paper were systematically studied (the transparency was expressed by the transmittance decreasing rate TD, TD≤10 %). The results showed that with the increase of pigment particle size, the particle size distribution became wider, the proportion of pigment increased, the solid content increased, the sizing amount increased, and the transparency of sizing layer decreased. When the PVA: 95GCC is 10: 1, the solid content of the sizing solution is 5%, the average particle size of the pigment particles is 0.934μm and the sizing amount is 1.0 g · m-2, the transparency of the sizing layer is better and the transmittance is decreased The rate is 6.3%.