Reduced nozzle viscous impedance

Details Reduced nozzle viscous impedance Reduced nozzle viscous impedance

B - Operations, Transporting

41

J

B41J 2/045 (2006.01) B41J 2/195 (2006.01)

Patent

CA 2100347

2100347 9212014 PCTABS00014 A method of operating a pulsed droplet deposition apparatus, e.g. a drop-on-demand ink jet printer, having a droplet liquid chamber (16) with which a nozzle (18) communicates for expulsion of droplets (12) from the chamber, droplet liquid replenishment means (20) connected to the chamber and energy pulse applying means for imparting pulses of energy to the droplet liquid in the chamber, employs, to increase the volume of droplets expelled by respective energy pulses, a droplet liquid having high viscosity at low shear rate and low viscosity at high shear rate, the liquid relaxation time constant being of the same order or greater than the period of pulses applied to the liquid and the characteristic time of the liquid in the nozzle being of the same order or less than the period of the pulses.

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