The present invention comprises the steps of quenching the (a) polytrimethylene supplying the terephthalate, (b) step of melt spinning the melted polytrimethylene terephthalate into filaments at a temperature of 245 to 285 ℃, (c) the filaments, (d) the step of stretching the quenched having filaments, (e) crimping the road Volume celebration of the drawn filaments using a mechanical crimping 8 to 30 crimps number / inch (3 to 12 / cm) step, (f) the crimp a step, and (g) the relaxed filament to relax the fibers at a temperature of 50 to 120 ℃ is about the length of 0.2 to 6 inches (about 0.5 to about 15 cm), characterized in that it comprises the step of cutting into a staple fiber method for producing polytrimethylene terephthalate staple fibers, to a polytrimethylene terephthalate staple fiber, yarn and textile. The invention also denier and crimp take-measuring the relationship between the up and, characterized in that for producing a staple fiber having a selected denier on the basis of the measurement, polytrifluoroethylene crimp take-methylene terephthalate staple fiber-up It relates to a method for optimizing. ; PTT staple fibers, a textile yarn, non-woven, crimp take-up
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