Requirements for higher speed and precision in applying very small volumes of material in precise locations have been met with the development of bet-' ter pump technologies and dispense methodologies for a much more controlled and automated process with tighter tolerance levels and higher throughput. One such example is jetting technology. Jetting has been widely used since the 1990s to expel controlled amounts of material at low volumes. Jetting dispenses droplets of fluid from the nozzle tip and propagates them toward the target in precise volumes via the striking motion of a piston over a seat. Jetting replaced needle dispensing, which requires Z-axis motion to dispense good quality dots. Jetting, which does not require Z motion, is performed on the fly; i.e., dots are fired while the head is moving from one dispense location to another. Jetting technology is much faster than needle dispensing and produces more stable, controlled, and tinier deposits.
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