AIR INTERLACED YARN STRUCTURE AND PROPERTIES

The air interlacing technique is used to introduce intermittent nips t o a flat filament yarn so as to improve its performance in further tex tile processing. Observation of the interlaced flat yarn nips reveals that their structure is very complicated and can be categorized into f our classes: twist, braid, wrap, and entanglement nips. The formation of these nip structure classes is largely affected by the condition of filament separation prior to mingling. Interlacing causes deteriorati on to filament yarn mechanical properties to various degrees, dependin g mainly on processing conditions, and the change in yarn properties i s correlated to nip structure characteristics.