The relation between pilling tendency and tensile properties of staple fiber was studied by rearranging and analysing a lot of data which had been carried out by trial and error.
Principal component analysis was used as a statistical analysis. It was found that pilling tendency by ICI-method (pill grade) is composed of three principal components as shown below.
Principal component No.1 is related to shear strength such as knot tenacity (KT), loop tenacity (LT) and loop elongation (LE), and its percentage of contribution to pilling tendency is found the largest.
Consequently, pilling tendency can be represented by a few tensile properties of staple fiber such as KT, LT and LE. Furthermore, rate constant of pill wearing-off (k2) by SF-pill-tester shown in the previous report holds good correlation to principal component No.1.