Abstract
The laboratory tests which are now in use for assessing the weavability of sized warp yarns are reviewed. Reference is made to the "dummy loom" type of test in which the elements of abrasion, flexure, and cyclic loading are combined. Some data are presented on the tensile properties of sized yarns before and after they have been subjected to sus tained abrasion in the dummy loom. A study of these properties for different amounts of sixe pickup and different extents of abrasion has confirmed the hypothesis that the effect of this type of abrasion is to remove the size film at varying rates from different parts of the yarn. Some data are presented which suggest that the transient abrasive action of actual looms on sized warp yarns is similar in kind though much less severe in degree.
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