Patent ID: 8684483

Claim:
A method of operating a jetting module comprising: providing a jetting module including a nozzle and a drop forming mechanism; providing a liquid to the jetting module under pressure sufficient to cause a liquid stream to jet from the nozzle; providing a small drop waveform that causes the liquid stream to break up into a small volume drop, the small drop waveform including a pulse having a width w S , the small drop waveform having a period x, where xâ‰ˆ1/f R , and where f R is the Rayleigh frequency of the liquid; providing a large drop waveform that causes the liquid stream to break up to form a large volume drop, the large drop waveform having a period Nx, the large volume drop being N times the volume of the small volume drop, the large drop waveform including a first pulse having a pulse width w L1 , where w L1 â‰§w S , the large drop waveform including a second pulse occurring within a period of (f R /f C )x of an initial pulse of a subsequent small drop waveform or a subsequent large drop waveform, where f C is the cut off frequency of the liquid, the second pulse having a pulse width w L2 , where w L2 <w S ; and activating the drop forming mechanism using a sequence of small drop waveforms, the large drop waveforms, or combinations thereof.