Coater Die Design and Coating Quality Evaluation in the Machine Direction of Slot Coating Through Computer Simulation

Abstract

ABSTRACT：Slot coating has been widely spread in photo resist coating on glass for flat display monitor. High quality of coating is required as high quality of image in display is needed. Coating quality in the slot coating is divided into nozzle direction quality and machine direction quality. Nozzle direction quality is related to flow uniformity inside the die whereas machine direction quality is related to die lip design and operational conditions. In this study coating uniformity in the machine direction of slot coating has been investigated through computer simulation. Die lip angle and die lip length were considered as outside die geometry and coating speed was considered as operational condition. Coating behavior has been analyzed and coating quality has been evaluated through computer simulation. Coating thickness decreased and coating uniformity increased as coating speed increased. However, the stability of meniscus formation was reduced and subsequently coating stability was reduced as coating speed increased. Coating thickness deviation decreased as die lip angle increased in down stream die. Coating thickness decreased and time to reaching steady state increased as increased die lip length in down stream die.

Effect of process parameters on properties of 3D printed continuous fiber reinforced thermoplastic composites

“…The double feeders contain active and driven shafts to feed thermoplastic resin filament and preimpregnated continuous carbon fiber into double nozzles. The part is printed on the hot bed, which provides some heat to reduce the warpage and deformation of the printed part during the cooling and solidification molding process (Kim et al , 2017). It needs to be noted that the cutter driven by servo is specially designed for the continuous fiber nozzle because the continuity of carbon fibers sometimes obstructs the freedom of path planning (Azarov et al , 2019).…”