Effect of viscoelasticity on dynamics and stability in roll coatings

Effect of viscoelasticity on dynamics and stability in roll coatings
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粘弹性对辊涂动态和稳定性的影响

DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Hyun
J. Hyun
中科院分区：
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文献类型：
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作者：
S. Han;D. Shin;H. Park;H. Jung;J. Hyun

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牛顿流体的流动特性和涂层窗口， 在正向和反向辊涂工艺中的粘弹性液体 已经检查过了。在这项研究中考虑的粘弹性液体， 作为博格流体，具有不同的弹性或拉伸性质 但剪切粘度几乎与牛顿流体相同。涂层厚度 在这两种流动中， 溶液以及操作条件，如毛细管数 以及两个辊之间的间隙尺寸。此外，均匀涂层的窗户 粘弹性液体的粘度急剧降低。这些结果 明显支持涂料液中少量聚合物 在改变涂层工艺的动力学和稳定性方面发挥着不可或缺的作用。
AbstractFlow behaviors and coating windows of Newtonian and viscoelastic liquids in forward and reverse roll coating processes have been examined. Viscoelastic liquids considered in this study, as a Boger fluid, have different elastic or extensional properties but almost same shear viscosity as Newtonian case. Coating thickness in both flows strongly depends on the viscoelasticity in polymer solutions as well as operating conditions such as capillary number and gap size between two rolls. Also, uniform coating windows are drastically reduced for the viscoelastic liquids. These results evidently support that a small amount of polymer in coating liquids play an indispensable role in altering dynamics and stability of coating processes.