Vormistamine ülesanne 2
Such pills are, usually,
caused by the combination of washing and wearing of fabrics; in detail, due to the abrasion of fabric
surface, a number of loose fibers tend to entangle into short fine hairs thus developing into spherical
bundles anchored to the surface of the fabric (see Figure 1).
The fabric’s pills formation (i.e. the so called “resistance to pilling”) is typically measured using
procedures described in Standards such as the D4970/D4970M-10e1 (ASTM, 2010) and the UNI
EN ISO 12945– 2004; since fabrics take a long time to be pilled in normal use, resistance to pilling
needs to be tested by a simulated accelerated wear, followed by a visual assessment of the degree of
pilling based on a visual comparison of the sample to a set of test images.
FIGURE 1. Example of pilled fabric
Two common pieces of equipment for pilling measurement, mainly used in Europe, are the
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