Wednesday, July 18, 2012

Human eye inspired clog-free ink jet printer invented



Researchers have invented a clog-preventing nozzle cover by mimicking the human eye.

“The nozzle cover we invented was inspired by the human eye,” said Jae Wan Kwon, associate professor in the College of Engineering.


“The eye and an ink jet nozzle have a common problem: they must not be allowed to dry while, simultaneously, they must open. We used biomimicry, the imitation of nature, to solve human problems,” Kwon said.


Kwon’s invention uses a droplet of silicone oil to cover the opening of the nozzle when not in use, similar to the film of oil that keeps a thin layer of tears from evaporating off the eye.


On the surface of the human eye, eyelids spread the film of oil over the layer of tears.

However, at the tiny scale of the ink jet nozzle, mechanical shutters like eyelids would not work, as they would be stuck in place by surface tension. Instead, the droplet of oil for the nozzle is easily moved in and out of place by an electric field.

Kwon said this invention could make home and office printers less wasteful.

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