Abstract
Worn-out slips collected from homes were examined, and a method has been proposed for predicting the actual wearing process without performing wearing tests.
Thickness, air permeability change in color and strength were measured at each of 18 portions of worn-out slips. The same tests were administered to eight new slips after 68-day wearing under controlled conditions (including 20 launderings).
Significant correlation was found between two groups of the data obtained at each corresponding portion. General findings concerning the part and the, sort of damage are as follows : (1) thickness increases at front of the thigh and decreases at the seat, (2) air permeability increases at the seat, (3) change in color is comparatively small at the back and appreciable at the lower part of the seat, (4) pills are formed in the areas of belt and fastener of skirt, (5) strength decreases at the lower part of the seat and (6) the upper part of the seat stretches.
