Research On The Micro-jetting And Control Technology Of High Viscosity Fluids

Fluid dispensing technology has become one of the key technologies of microelectronics packaging. Fluid dispensing is a process to dispensing the fluid accurately in a controlled manner. There is an evolution in the fluid dispensing technology for applying fluids from contact methods to non-contact methods, change is inevitable. This transition is as similar in our niche market as the transition from contact printing to inkjet printing for computer printers. Jetting technology is fast, effective, no limited by space and offers many advantages over traditional needle dispensing to deliver speed, quality, low cost of ownership. Jetting is the best way to dispense many fluids quickly and accurately. Mechanical jetting technology of high viscosity is being used to develop a system of adhesive jetting dispensing experimental platform in our lab.First, various principles of jetting dispensing technologies were introduced, their virtues and application fields were analyzed, it was found that mechanical jetting technology can satisfy the demand of fluid dispensing process. Related theoretical method for mechanical jetting technology was analyzed. Based on the principle of mechanical jetting technology, jetting dispensing valve was designed. Structural design for nozzle and proper choose drive for dispensing valve were described. Jetting dispensing valve is key element of the jetting dispensing system, the precision and performance of the valve will affect the precision and quality of fluid dispensing.Then, According to the demand of dispensing technology in microelectronics packaging, a jetting dispensing system was developed. The system is consist of dispensing valve, motion stage, temperature control subsystem, pneumatic subsystem, driving circuit for electromagnetic valve, control system and system control software. The design and implementation of the overall structure and the various components of the system were described in the thesis in detail.Finally, the parameters and performance of the jetting dispensing system were researched. Adhesive jetting dispensing experiments were conducted with changing control parameters. The reasons and solutions for the troubles appeared in the experiment were given out. The analysis and experiment for adhesive jetting dispensing in array manner were conducted. Due to the limitation of manufacturing technology, the nozzle was fabricated and the diameter of the hole in the nozzle was 0.4mm, the jetting dispensing valve can work at rates of up to 30 Hz. The feasibility of the jetting dispensing system was proved by adhesive jetting dispensing experiment and fundament has been built for the further research.