Nordson EFD, a Nordson company, says it has developed a non-contact dispense valve for precision jetting of low viscosity flux onto solar cell bus bars.
Operating at speeds up to 500Hz/sec, the Square Wave 745NC valve deposits continuous lines of microdots on the solder-coated metal ribbons that connect adjoining PV wafers, according to the company. Nordson says flux removes oxidation and contamination to improve solar cell efficiency and power output.
The Square Wave's solenoid technology delivers a high-speed cycle rate that minimizes process variation for repeatable dot-to-dot consistency. Nordson adds that a low actuation speed of 2 milliseconds prevents buildup of flux crystals on the valve's nozzle.