All the above three parameters have been set as per the three levels specified in the Table 1 with all other factors
as fixed. A three level factorial model with face centered central composite cubic design model has been opted with
the alpha =1. In this model 8 full factorial, 6 axial or star runs and 6 center runs are being considered. A total of 20
experiments are to be conducted to obtain a model equation in terms of the process parameters as in Douglas