Modeling the Performance Properties on Woolen Handknotted Carpets using Response Surface Methodology

Modeling the Performance Properties on Woolen Handknotted Carpets using Response Surface Methodology

In this study, the main purpose is to predict the performance properties of woolen hand-knotted carpets using response surface methodology (RSM). We have considered the thickness loss of surface pile yarns (TL) and compression toughness index (TI) as representative of the compression properties, and color difference index of pile yarns (ΔE), tuft size index (TS) and evenness of texture index (ET) as representative of the appearance characteristics. Eighteen woolen hand-knotted carpet samples with different structural specifications were produced. The carpet samples were subjected to 4000, 8000 and 12000 drum revolutions (wear factor) using a Hexapod tumbler tester. Meanwhile, performance properties of samples were investigated in original and worn out carpet samples. Factorial experimental design and response surface method were applied for modeling of each performance property. To optimize some initial models, the Box-Cox transformation was used. In addition, contribution of different variables was determined. The models showed a desirable fit and high adjusted R² values were resulted. The ANOVA test showed that the obtained models are valid at 5% significant level.