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Off-line control of time-pressure dispensing processes for electronics packaging

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4 Author(s)
Chen, X.B. ; Dept. of Mech. Eng., Univ. of Saskatchewan, Saskatoon, Sask., Canada ; Zhang, W.J. ; Schoenau, G. ; Surgenor, B.

Fluid dispensing is one critical process in electronics packaging, in which fluid materials (such as encapsulant, adhesive) are delivered controllably onto substrates for the purpose of encapsulation. Time-pressure dispensing is recently the most widely used approach, and its control has proven to be a challenging task due to the fact that the dispensing process performance is significantly affected by the behavior of the fluid dispensed. Moreover, if the fluid exhibits time-dependent behavior, the control becomes more difficult and demanding. This paper presents a method to model the time-pressure dispensing process, taking into account the time-dependent fluid behavior. Based on the model developed, an off-line control strategy is developed for improving the process performance. Experiments on a typical commercial dispensing system were carried out to verify the effectiveness of the modeling method and the off-line control strategy.

Published in:

Electronics Packaging Manufacturing, IEEE Transactions on  (Volume:26 ,  Issue: 4 )