The self-extensible polyester composite filament was prepared by using the high-shrinkage yarn ( 33 T-12-FDY) as the core yarn and the superfine POY (35T-96-POY) as the sheath yarn. The shrinkage temperature, over feeding ratio and drafting ratio were discussed. And the results showed that, 1. boiling water shrinkage reduced gradually with the increase of over-feeding ratio even if heat treatment temperature was different;2 . the self-extensible ratio of the composite filament after boiling processing increased gradually with the increase of over-feeding ratio;3. under the same over-feeding ratio, the higher temperature, the less shrinkage ratio and the lower self-extensible ratio. The optimal parameters ( 185 ℃, 40％ over-feeding rate and no stretching of POY ) were established by analyzing the experimental results.%以高收缩纱线33 T-12-FDY为芯纱、超细预取向丝35 T-96-POY为鞘纱,设计制备出自发伸长涤纶复合丝,并对鞘纱松弛热处理温度、超喂率及牵伸倍率进行探讨.结果表明,即使热处理的温度不同,沸水收缩率也会随着超喂率的提高而呈逐渐减小的趋势,沸收后的自发伸长率均会随着超喂率的提高而呈逐渐增大的趋势.而在相同的超喂率下,温度越高沸水收缩率越小,自发伸长率越低.根据总体伸长率情况,最终确定选用温度为185℃、超喂率40％、POY不延伸的加工工艺.
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