HP dual drop explained (Sort of).

[enduser]

http://www.hp.com/hpinfo/newsroom/press_kits/2008/GSBfall08/bg_564inkcartridge.pdf

An HP document on "dual drop" technology and why photo cyan and magenta are no longer used.

[kers]

The article starts with ; " in fall 2008....
Do you think it is valid for todays printers?

[enduser]

A bit old, I agree. But I think it's current because the new Z9 series mentions "dual drop" as among the latest "design innovations". The 2008 article was when they first started rolling it out.

[Ernst Dinkla]

The article starts with ; " in fall 2008....
Do you think it is valid for todays printers?

Possibly though, Dual droplet thermal heads already existed before 2000, at least the patents show that. What I recall not that successful in products, and after that a  return to one size droplet heads with more nozzles + smaller droplets as the better alternative. Improved MEMS technology for head production made that possible around 2005? Implementing dual droplet size heads in that technology had to be done again I guess, nozzles a lot closer to one another with the risk of interfering. 2008 should describe the improved MEMS variation I think.


Met vriendelijke groet, Ernst

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
March 2017 update, 750+ inkjet media white spectral plots

[MfAlab]

http://www.hp.com/hpinfo/newsroom/press_kits/2008/GSBfall08/bg_564inkcartridge.pdf
An HP document on "dual drop" technology and why photo cyan and magenta are no longer used.

interesting.. HP actually uses one row for small droplets and another row for big ink drops. It's "dual drop" from different nozzles, not "vari-drop" from the same nozzle. Maybe new HP 746 printhead using in Z9+ is similar.

[Ernst Dinkla]

interesting.. HP actually uses one row for small droplets and another row for big ink drops. It's "dual drop" from different nozzles, not "vari-drop" from the same nozzle. Maybe new HP 746 printhead using in Z9+ is similar.

Yes, that has been the approach with thermal heads. With piëzo heads you can vary the voltage and pulse to pump different droplet sizes. The heater in thermal nozzles will not act as flexible. With thermal head nozzles being less complicated in design it is easier to add another row with lower capacity.

Met vriendelijke groet, Ernst

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
March 2017 update, 750+ inkjet media white spectral plots