A process for manufacturing a bulky flat yarn.

摘要

A process for manufacturing a bulky flat yarn comprising: preparing at least two kinds of thermoplastic synthetic undrawn yarns (1, 2) having different natural draw ratios, respectively; simultaneously drawing said prepared yarns at a draw ratio which is equal to or larger than the smallest natural draw ratio of the yarns and which is equal to or smaller than the largest natural draw ratio; and releasing drawing tension in the yarns after they are drawn. The yarns are mixed by means of an interlacing air nozzle (3) before or after they are drawn.