The Estimation of the Lifetime of Woolen Carpets Based on Changes in Appearance and Color

The main purpose of this study is to achieve a formula to estimate the lifetime of hand-knotted woolen carpets based on changes in the appearance and color of carpet using statistical techniques. Thickness loss of surface pile yarns (TL), color difference index of pile yarns (E), tuft size index (TS) and evenness of texture index (ET) were considered as representative of the appearance characteristics. Eighteen hand-knotted woolen carpet samples (symmetric knot) with different structural specifications were produced. The carpet samples were subjected to 4000, 8000 and 12000 drum revolutions using a Hexapod tumbler tester and functional properties of samples were investigated in original and worn out carpet samples with standard methods and image processing technique. At first the effective variables selected by using multivariate test, and then multivariate analysis of variance was used for evaluating the significance of obtained models. Optimal separate equations of the functional properties on hand-knotted carpets were determined through multivariate multiple regression method. Reverse model of wear factor can be considered as a proper equation to predict the lifetime of carpets.