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(Ajou University) (Ajou University) (Ajou University) (Ajou University) (Ajou University) (Ajou University)
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한국생산제조학회 한국생산제조학회지 한국생산제조학회지 Vol.32 No.5
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    초록·키워드

    Slot die coating is a pre-metered coating process commonly used for manufacturing thin and wide films with high production speed and good uniformity. Recently, there has been an increasing demand for variable-width coating by changing the slot width. In this case, the discharged flow rate per unit width must be continuous for optimal uniformity thickness. This study assesses the flow rate from the variable width slot die nozzle by adapting a gravimetric method using a precision weighing balance. Changing slot width alters internal flow dynamics. Therefore, through the fluid simulation, we gauged any flow rate change caused by the hydrodynamic force from the width change. For uniform coating thickness, we controlled the pump with the feedforward method from the baseline obtained by the simulation. Experimental results demonstrate that the flow rate error was enhanced by 81% and 14% for opening and closing slot cases, respectively.

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