TY  - JOUR
AU  - Luangpaiboon, Pongchanun 
PY  - 2010
TI  - Improving an Electrostatic Powder Coating Process via Signal to Noise Response Surface
JF  - American Journal of Applied Sciences
VL  - 7
IS  - 11
DO  - 10.3844/ajassp.2010.1521.1527
UR  - https://thescipub.com/abstract/ajassp.2010.1521.1527
AB  - Problem statement: In a coating process, the master plate referenced brightness or color
shade was critical to the exterior appearance on aluminum alloy wheels. The quality measures of
interest are the metallic paint thickness values on four areas. Because of these lower quality levels, the
manufacturer has spent more on the cost of restudy or scrap as well as the longer production time.
Approach: An expert system revealed seven process variables affecting those quality characteristics.
Taguchi signal to noise ratio or SN of paint thickness values on the outboard spoke area was
determined as a process response whereas SN on the remaining areas of window outboard, window
between spoke and inboard spoke became merely process constraints. A constrained response surface
optimization method and a modified complex method were performed to move the current operating
condition towards the optimum. Results: The new settings improved the paint thickness values in
terms of both the average and the standard deviation on all critical areas except the window between
spoke. Conclusion: As expected, the implementation brings the reduction of the metallic paint
consumption and the mismatch level of color shade.