A CLOSED-LOOP CONTROL ALGORITHM FOR STENCIL PRINTINGAuthors: Leandro G. Barajas
Company: Georgia Institute of Tech.
Date Published: 6/11/2002 Conference: Advanced Technology Symposium
These difficulties are addressed by the controller proposed in this paper, which is based on an algorithm for generating a sequence of iterative values that converge to an optimum set of machine parameters for a desired solder paste volume. The merit of the control is that it minimizes the variance and the steady state error of the weighted sample mean versus the desired height, which improves the quality of the process. In addition, it considers print direction and different component types independently. Finally, this controller also automatically corrects for the process errors associated with the loss of the solder-paste working-viscosity-point, which can occur due to unscheduled stops on the line, and for incorrect specification of machine parameters given by the operator.
Keywords: Stencil printing process control, least squares, affine estimator.
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