The structural changes on heat-setting and friction-twisted texturing of commercial nylon 6 multifilament yarn have been studied over a range of heater temperature and heater-contact time. Both heat-setting and texturing result in increase of crystalline content and decrease of crystallite orientation. The changes in these structural parameters, when plotted as functions of heater temperature and heater-contact time, show important differences. An attempt is made to explain the temperature- and time-dependence of the structural changes. The likely effect of these structural changes on some mechanical properties is discussed.
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