Run to run control of time-pressure dispensing system

In electronics packaging the time-pressure dispensing system is widely used to squeeze the adhesive fluid in a syringe onto boards or substrates with the pressurized air. However, complexity of the process, which includes the air-fluid coupling and the nonlinear uncertainties, makes it difficult to have a consistent process performance. An integrated dispensing process model is introduced and then its input-output regression relationship is used to design a run to run control methodology for this process. The controller takes EWMA scheme and its stability region is given. Experimental results verify the effectiveness of the proposed run to run control method for dispensing process.