Simulation and experiment study on adhesive ejection behavior in jetting dispenser

Abstract

In this paper, fundamental equations for jetting dispenser are presented to express the influence of adhesive pressure, nozzle diameter, and needle movement law, and the equations are then verified by flow behavior simulation. Subsequently, a novel jetting dispenser system is built to finish experiments about the mentioned influence parameters, and simulation results verify the regularities from experiment are correct. Flow velocity in the central nozzle will be faster and radius of the droplet will be bigger if the pressure in the chamber became higher, flow velocity in the central nozzle will be constant and the radius of the droplet will be bigger if the dead time became longer, and bigger nozzle diameter can lead to faster flow velocity in the central nozzle and bigger droplet. Besides, these mentioned works prove that our designed jetting dispenser is practical and useful for adhesive jetting.

Keywords:

• jetting dispenser
• adhesive pressure
• needle movement law
• ejection behavior

Acknowledgments

This work is supported by the Fundamental Research Funds for the Central Universities [No. 2010121039]; the National Natural Science Foundation for Youth of China [No. 51105320].