Experiment study influences of some process parameters on dispensing dots consistency in contact dispensing process

Good dots consistency including both shape and size is a basic requirement in the process of fluid dispensing dot. Non-Newtonian fluid transferring, which denotes Non-Newtonian fluid transfers from needle tip to the substrate, has important influences on dots consistency in contact dispensing dot. Under dispensing condition the dispenser, needle and fluid material are selected, the main factors affecting Non-Newtonian fluid transferring are as following: the matching condition between dispensing height and parameters affecting fluid extrusion including both fluid volume and extrusion time; the fluctuation of both practical dispensing height and fluid extrusion. Through experiment, this paper studied both the matching relationship between the fluid extrusion and dispensing height and influence of fluctuation of dispensing height on dots consistency in contact dispensing dot process. Experiment results show that decrease the fluctuation of dispensing height by compensating dispensing height error caused by the flatness error of the substrate through software control can improve dots consistency, that dispensing height has direct influence on both dots size and dots consistency and there is a best matching between dispensing height and fluid extrusion volume to accomplishment best dots consistency under specific dispensing condition; and that fluid extrusion time also has some influences on dispensing dots consistency