Reduction of Amount of Dye during Spin Coating

概要

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Reducing the amount of dye used in the spin-coating process for compact disc-recordable (CD-R) is essential for cost reduction and environmental consideration. The results of flow visualization show that, compared with that on a smooth substrate, the patterned roughness on the pregrooved substrate does affect the fingering instability and the amount of time needed for fully coating the substrate. The airshear flow above the disc will affect the injection of dye onto the disc, particularly in an area of larger radius. Therefore, a higher disc rotation speed $\omega_{1}$ in the stage of dye injection is not necessarily better than a slower one. The range of nozzle-moving speed $V$, which can be used for fully coating the substrate, is wider at $\omega_{1}=300$ rpm than that at $\omega_{1}=500$ rpm. The regime maps for injection rate $Q$, nozzle-moving speed $V$, and injection volume $\Omega$ show that by choosing appropriate $Q$ and $V$, the amount of dye used was reduced to $\Omega=0.05$ mL.
2006-03-15