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Industry Trends

Finally, We Have New Inkjet Printers for Inking Jets

by Adam Lovinus July 26, 2017
by Adam Lovinus July 26, 2017 0 comment 7374 views

Today, after decades of development, new inkjet printers can literally ink jets. Southwest Research Institute (SwRI), a R&D government contractor in San Antonio, fashioned a robot arm with sensors that negotiate aerodynamic curves of a jet fuselage, moving a print head that ink-renders a digital image onto the aircraft.

Apart from the spectacular wordplay, inkjets for jets address a real pain point in the industry.

Inking jets is actually very important to do right

Aircraft coating has extensive requirements for accuracy. The weight of the paint and finishers affects the integrity of the aerodynamics and flight performance, and guard against corrosion from the elements. The 22-page FAA guideline on aircraft paint details all of this if you’re interested in learning more.

“There is a lot of interest in using inkjet technologies applied to aircraft painting,” SwRI project manager Clay Flannigan said. “We have been developing new processes for removing paint from aircraft for nearly three decades. Now we are looking to revolutionize the way decorative finishes are applied to aircraft.”

Inkjet inks jets

SwRI’s robotic inkjet inks jets and other complex shapes

It is in fact quite similar to an office printer

The technology on your office inkjet printer dates back about 40 years. The rendering of digital images by computer-controlled machinery happens by drop-on demand, or DOD technology. It involves separating a droplet of ink from a main reservoir, adding heat or an electrical charge, and squeezing it through a tiny nozzle onto a medium.

In the late 1970s, Canon and Hewlett-Packard developed Thermal DOD for paper printing in parallel. The film resistor films on inkjet cartridges belong to HP. Canon uses air pressure in to eject droplets, hence the name bubblejet printer.

Epson invented printers that sent electrical charge into a crystalline material, heating ink drops and producing vibrations that force ink through print nozzles.

That crystal-type technology, called piezoelectric DOD, gained popularity in the mid-1980s as a way to mass-produce fine art print work. Eastman Kodak’s IRIS printer was the first of its kind. The large format inkjets of today improve on IRIS by keep cartridges flushed to prevent dry, crusty nozzles—that’s what causes white streaks on ink prints—and have internal drivers especially for reading designs from desktop CAD software.

Large format printers

HP Designjet Large Format Inkjet Printer

Robotics and AI take inkjet printing to the next level

When applied to objects that aren’t paper, inkjet technology is called direct printing—it prints directly on an object instead of a decal applied later. Sophisticated computer systems and robotics make possible inkjet printing on complex shapes. The new SwRI system is patented as “High Accuracy Inkjet Printing”—using AI to sense and navigate around the hull of the aircraft.

Aerospace trade writer Bruce Walton describes it:

A vision sensor detects an encoded pattern to accurately apply the graphic images. The encoded pattern is deposited on the surface in a known location with respect to the most recently deposited graphic swath. The printing system has high-bandwidth servo actuators to locate the print head with respect to the encoder pattern to enable precise positioning for the next swath.

As aircraft shapes become more complex and hopefully printing makes air travel safer. Safety is well and good, elaborately detailed shark mouths sprayed onto military aircraft makes new inkjet printer technology worthwhile in and of itself.

Adam Lovinus

Adam Lovinus

A tech writer and Raspberry Pi enthusiast from Orange County, California.

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Finally, We Have New Inkjet Printers for Inking Jets
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Finally, We Have New Inkjet Printers for Inking Jets
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Apart from the spectacular wordplay, inkjets for jets address a real pain point in the industry.
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Adam Lovinus
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Adam Lovinus
Adam Lovinus

A tech writer and Raspberry Pi enthusiast from Orange County, California.

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