| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 613353 | Journal of Colloid and Interface Science | 2006 | 11 Pages |
Among various coating processes, slot die coating belongs to a class of pre-metered coating, in which the coating film thickness can be predetermined. In the past, most research works on slot die coating have focused mainly on polymer solutions; very little information is available using suspensions as coating fluids. In this study, the effect of adding TiO2 and SiO2 in aqueous polyvinyl alcohol (PVA) solutions on slot die coating is investigated. It was found that the stable coating window was enlarged with the addition of particles, and its size increased with solids concentration. This is due to the strong interaction between polymer and particles, resulting in a higher viscosity and surface tension. As a result, the upstream coating bead is more stable and the maximum coating speed is extended to a high value, hence the coating window becomes larger. Although both viscosity and surface tension appear to contribute to the stability of coating flow, the effect of surface tension is more dominant. The surface tension of a suspension with porous particles was higher than one with hard solid particles. Consequently, the coating window obtained with the former was significantly larger than the latter. Flow visualization revealed that under the same operating conditions, the upstream dynamic contact angle for the suspension was smaller than for the aqueous polymer solution. This observation could be related to the stability of the upstream coating bead, and hence the coating window. The experimental flow fields were verified numerically with the aid of a numerical simulation package (Flow-3D).
Graphical abstractCoating windows of polyvinyl alcohol solution at different concentrations of SiO2 suspensions. (■) 2.5% PVA, (○) 3.5% C803 in 2.5% PVA, (▵) 7% C803 in 2.5% PVA. V is the coating speed and q is the volumetric flow rate/coating width. Coating window is expanded if particles are added.Figure optionsDownload full-size imageDownload as PowerPoint slide
