凹印用铜金粉的物理性能

Physical properties of bronze powder in intaglio printing

利用扫描电镜对凹印用铜金粉的物理性能进行了研究 ,考察了铜金粉的微观形貌、粒度分布、厚度及在黏结料中的排列行为。结果表明 ,进口铜金粉的粒度分布均匀 ,表面干净 ;国产铜金粉粒度极差大 ,细小颗粒所占比例过多 ,从而影响了国产铜金粉的印金光泽度。进口铜金粉的厚度在 0 .1μm左右 ,径厚比约为 5 0 ;国产铜金粉的厚度在 0 .1～ 0 .3μm之间 ,径厚比约为 40。铜金粉的片越薄 ,水面遮盖率越大。铜金粉在黏结料中形成与纸面平行的方向定向排列 ,铜金粉的这种排列行为与其光学性能密切相关。

SEM was used to study physical properties of bronze powder in intaglio printing. Its microphotograph, size distribution, thickness and behavior in oil ink were mainly investigated. The results indicate that the imported bronze powder whose surface is clean has the narrow distributions of particle size. The domestic particles with wide size distribution contain a large proportion of too small powders, which reduce its metallic gloss. The thickness of imported products is about 0.1?μm and the radio of diameter to thickness is 50, but the thickness of national ones ranges from 0.1 to 0.3?μm and the radio of national ones is 40. The thinner the flakes are, the more excellent water surface covering power is. Directional arrangement of bronze powder in printing ink was observed, which has a impaction on optical property.