A new two-phase fluid dispensing technology for the adhesive distribution

The fluid dispensing with a controllable method is one of the key technologies in electronic packaging. The the higher accuracy and consistency boosts the emergence of the new fluid dispensing technologies. This paper first adopted the two-phase fluid principle for the fluid dispensing technology and designed and fabricated the unique dispenser prototype. The slug flow was a stable flow type in the two-phase fluid with an intermittent bubbles and droplets. To control the flow parameters of the two fluids which were the compressed gas and adhesive, it performed an intermittent and a persistent fluid dispensing process. The accurate and uniform droplets without satellite points had the same volume and mass were 660.6nL and 766μg, while the adhesive, compressed gas and electromagnetic valve had a flow rate for 1.4mL/min, a pressure for 80KPa and a frequency for 8Hz, respectively. As the gas pressure dropped down to 60KPa and the adhesive flow rate was 2.0mL/min, the adhesive dispensed to the substrate in a stream mode with a width for 2.3mm.