**4. Conclusion**

**Source P Value Adjusted R2 Predicted R2**

**Model** 91.58 <0.0001 89.28 <0.0001 **Mass Per Unit Area** 5.40 0.0213 4.22 0.0415 **Fiber Type** 138.62 <0.0001 111.04 <0.0001 **Applied Force** 38.32 <0.0001 31.58 <0.0001 **Contact Surface** 318.75 <0.0001 333.38 <0.0001 **Fabric Direction** 3.32 0.0701 7.395E-004 0.9783 **Weight2** 72.95 <0.0001 83.57 <0.0001 **Weight × Applied Force** 86.79 <0.0001 57.47 <0.0001 **Weight × Contact Surface** 50.17 <0.0001 48.94 <0.0001 **Fiber Type × Contact Surface** 7.83 0.0006 9.40 0.0001

**R2** 0.8681 0.8651 **Adjusted R2 <sup>d</sup>** 0.8586 0.8554 **Predicted R2 pre** 0.8485 0.8456

The regression equation of the quadratic model for spunbond nonwoven sample is as follows;

Static Friction Coefficient = 0.24 + 0.00364×A - 0.019×B-0.015×C + 0.045×D + 0.003×E -

Kinetic Friction Coefficient = 0.24 + 0.004678×A - 0.017×B - 0.013×C + 0.047×D - 0.004×E +

According to model performance values, the correlation coefficient between predicted and observed air permeability values is 0.85, indicating a strong predictive capacity of the regres‐

**Static Kinetic**

**F Value Prob>F F Value Prob>F**

**Linear** <0.0001 0.6451 0.6290 **2FI** <0.0001 0.7765 0.7536 **Quadratic ≤ 0.0001 0.8554 0.8456 Cubics** <0.0001 0.7726 0.7611

**Table 8.** Model summary statistics (kinetic)

**Factor**

28 Non-woven Fabrics

**Table 9.** ANOVA table

0.001931×AC - 0.023×AD + 0.005×BD - 0.16×A2

0.00012×AC - 0.022×AD + 0.0060×BD - 0.17×A2

sion model for spunbond nonwoven samples.

Nonwoven industry brings a wealth of advantages to people throughout the world by providing the superior products. For example, modern disposable baby diapers have made an important contribution to the quality of life of millions of people. Since their introduction, modern single-use diaper products have improved steadily through scientific advances in design and basic raw materials, becoming lighter, more compact, more absorbent, and easier to use. For this reason, selection of raw material is very important for nonwoven manufactur‐ ers. Raw materials have not only delivered significant product improvements but also benefited people people using these products byproviding hygiene and comfort.
