Multi-objective optimization in the development of oil and water repellent cellulose fabric based on response surface methodology and the desirability function

The present study investigated multi-response optimization of certain input parameters viz. concentrations of oil and water repellent finish (Oleophobol CP-C (R)), dimethylol dihydroxy ethylene urea based cross linking agent (Knittex FEL) and curing temperature on some mechanical, (i.e. tear and tensile strengths), functional (i.e., water contact angle `WCA', oil contact angle `OCA') and comfort (i.e. crease recovery angle `CRA', air permeability `AP', and stiffness) properties of an oleohydrophobic finished fabric under response surface methodology and the desirability function. The results have been examined using analysis of variance (ANOVA) and desirability function for the identification of optimum levels of input variables. The ANOVA was employed also to identify the percentage contribution of process factors. Under the optimized conditions, which were obtained with a total desirability value of 0.7769, the experimental values of Oleophobol CP-C (R) (O-CPC), Knittex FEL (K-FEL) and curing temperature (C-Temp) agreed closely with the predicted values. The optimized process parameters for maximum WCA (135 degrees), OCA (129 degrees), AP (290 m s(-1)), CRA (214 degrees), tear (1492 gf) and tensile (764 N) strengths and minimum stiffness (3.2928 cm) were found to be: concentration of OCP-C as 44.44 g l(-1), concentration of cross linker K-FEL as 32.07 g l(-1) and C-Temp as 161.81 degrees C.