纳米包覆颜料多相流体的喷墨行为

以纳米包覆颜料为着色剂，探讨了共聚单体、表面活性剂、保湿剂、喷射电压和波形对墨滴形态、墨滴拉伸长度、断裂时间、液滴飞行速度、斜喷角度和卫星点等喷墨行为的影响。结果表明表面张力越小液滴越容易离开喷嘴，形成柱状细线，产生卫星点；保湿剂和共聚单体用量越多，黏度越大，主液滴速度越小，可有效减少卫星点；喷射电压在一定范围内，卫星点能追上主液滴；相同物理性质的液滴在不同波形下的喷射性能也不一样，可以选择不同的波形来提高打印流畅性。另外，低表面张力和高黏度可以减小斜喷角度，增加卫星点追上主液滴的概率。

Ink-jetting properties of nano coated pigment multiphase fluid

Taking nano capsulated pigment as the colorant, the surfactant, humectant , comonomer, injection voltage and waveform which could affect the formation and injection performance of the droplet were studied.Experimental results showed that lower surface tension made the droplet easier to leave the nozzle and formed filaments and satellites;humectant and comonomer might increase the viscosity which could reduce droplet speed and restrain satellites ;when injection voltage was within a certain range, satellites could catch up with main droplet;the proper waveform for inks in squeeze-mode piezoelectric was another key factor to inkjet printing .In addition, low surface tension and high viscosity can reduce injection angle, then satellites could catch up with main droplet easily.