Capillary flow in polyester (PET) yarn is studied by Image Analysis of liqu
id rising into the yarn. Considering the yarn at various levels of saturati
on, we established an experimental law between the intensity of the signals
, expressed in grey levels, and the quantity of liquid in a yarn area. This
relationship allowed us to make more precise studies on the liquid distrib
ution inside the yarn during capillary rise. The influence of yarn torsion
on the liquid distribution into PET yarn was determined. These experiments
contribute to a description of the heterogeneous structure of yarns and to
a better knowledge of the wicking of yarns with liquids. (C) 2001 Elsevier
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