The paper explores the behaviors of thin-film formation through the microfluidic deposition method, in which the spherical liquid droplet on solid surface may turn into a thin film. Small liquid drops with diameter of less than 100 micro-meters are virtually to be generated with some certain velocity by current inkjet-like mechanism. Fundamental physical modeling for the dynamic situation is first built up. Thus the time evolutions of fluid behavior are solved by numerical method. Drop-on-demand droplets are secondly applied to demonstrate the thin film on the glass that the solid surface is patterned with rectangular well. Experimental results show that uneven surface of thin film with curvature may always be formed mainly due to the patterned well. It suggests that the topographic pattern can make significant effect on the formation of thin film from the liquid droplets.
The paper presents a new processing method for design and fabrication of microlens by microfluidic deposition, in which the lenses can be formed on the media with high precise location in the fabrication process. First we may apply physical vaporization deposition (PVD) or spin coating to fabricate a thin film; secondly, the hydrophilic pattern specified by the mask of lenses can be created by photolithography, where the special lens media is made herein. Finally, the liquid solution of lens material is deposited onto the predetermined location of the lens media by the drop-on-demand fluidic actuator; thus, the microlenses are consequently formed after the complete evaporation of solvent in the solution.
This paper explored a new micro-fabrication design of color filter for liquid crystal displa , which was based on the so-called ink-jet technology today. Technicall , a new type of micro-fluidic method was presented to realize the most important manufacturing steps of color filter that specific red, green, and blue ink droplets generated from the drop-on-demand jet heads could be accuratel deposited onto a transparent substrate. Physicall , those droplets were automatically formed very thin color films because of natural liquid surface tension between the droplets and substrate. To obtain the desired thickness of color film, high walls were made on the surface of the substrate to allow the droplets freely flow in essential one dimension under constraint of two neighboring walls before the film forming and drying. As a result, a color filter with desired striped pattern we designed could be simply completed; for example, the droplets of 60-micrometer diameter might be expected to yield a 110-micrometer by 110- micrometer pixel of color filter with color thickness of one micrometer . By comparison with current pigmentdispersed method, we estimated that similar chromatic performance in the final product could be achieved with much low cost and short manufacturing process in the presented method herein.
This paper explored the design of large ink supply system of ink-jet printer, which is in general installed in so-called wide format printer today. Subsequently, a new type of large ink supply system was presented to fulfill the fundamental functions that ink in the reservoir could be automatically delivered into the print head of printer by means of capillary force in nature. Moreover, the new system was characterized with no traditional long tubing portions such that pressure loss or vibration, due to long ink passage of tubing, could be eliminated. To achieve the goal of removing traditional long tubing system, the ink reservoir width of system must be greater than the print width of printer. As a result, a stable back pressure of print head can be kept all the time no matter the print is printing or not; it could also be more stable than before even if print head is moving in high speed. Hence, better print quality could be obtained in the printer equipped with the new system of paper.
The paper had studied the influence of compression ratio of foam on printing quality of ink cartridge. Fundamental properties of foam were first introduced as a review. Thus, some basic models for compression of foam could have been built up to deal with the physical effect of compression on the back pressure of ink cartridge. It might actually make difference on many aspects for an ink-jet printer. By means of experiments, several individual cases had been done which composed of different combinations for the compressed foams and color inks. It turned out that the printing quality might be much influenced in the cases. The results implied that the compression ratio of foam should be correctly chosen in order to yield best quality on the print. Finally, detailed analysis explained to make a suggestion for the choice. It's expected to be very helpful in the future design of ink cartridge with the foam.
The influence of back pressure of ink cartridge on regular operation of ink supply system was dealt with in the paper. In recent years, large ink supply system has developed at lot o increase the print usage of cartridge; however, the amount of back pressure in the cartridge may change very much when the cartridge would be equipped with ink supply system. It might further result in different printing behavior of cartridge in the printer. It's much of interest int he study. Therefore, experiments were done to determine what influence might occur in one specific test system. It was found that ink droplet, nozzle firing, and print quality were significantly influenced over the time of ink supply. The experimental result was helpful in future design of ink supply system.
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