A process for producing a bulked nylon 6.6 filament yarn by the steps of continuously spinning, drawing and crimping in which the filaments, after melt spinning are subjected to a two-stage steaming process, the second stage of which is for a period of at least 5 seconds maintaining the yarn temperature at at least 55 DEG C and raising the moisture content of the yarn to at least 9 percent. Crimping is performed by a steam injection stuffer-box crimping treatment as described in British Pat. No. 1,034,418. Desirably the yarn is intermingled after crimping and wound up without the insertion of twist.
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