Patent ID: 8714676

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 pulse energy E S , the small drop waveform having a period X S , where X S ≈1/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 X L , where X L =NX S , 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 energy E L1 , where E L1 ≧E S , the large drop waveform including a second pulse occurring within a time period X 2 , where X 2 ≦X S , of an initial pulse of a subsequent small drop waveform or a subsequent large drop waveform, the second pulse having a pulse energy E L2 , where E L2 <E S ; and activating the drop forming mechanism using a sequence including a combination of at least one small drop waveform and at least one large drop waveform.