Direct Write Using Ink-Jet Techniques

This chapter illustrates the ability of ink-jet printing technology to dispense, in a controlled manner, a wide range of materials to rapid prototyping applications. The ink-jet printing technology can reproducibly dispense spheres of fluid with diameters of 15-200 μm at rates of 0-25000 per second for single droplets on demand, and up to 1 MHz for continuous droplets. Ink-jet-based deposition requires no tooling, is non-contact, and is data driven. No masks or screens are required and the printing information is created directly from CAD information and stored digitally. As an additive process with no chemical waste, it is also environmentally friendly. This dispensing technology is adaptable to a wide range of materials such as biomedical reagents, liquid metals, and optical polymers. Using ink-jet-based methods, commercialization of products is in progress for DNA microarrays, color displays, electronics assembly, and photonic elements. .

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