CPC D01D 5/22 (2013.01) [B29B 13/065 (2013.01); D01D 5/32 (2013.01); D01D 10/02 (2013.01); D01D 10/0409 (2013.01); D01D 10/06 (2013.01); D01F 8/14 (2013.01); D02G 1/004 (2013.01); D02J 1/228 (2013.01); D02J 13/003 (2013.01); D02J 13/005 (2013.01); B29B 2009/165 (2013.01); D10B 2331/04 (2013.01)] | 9 Claims |
1. A method for preparing a PET/PTT parallel complex filament with high self-crimpiness, wherein PET and PTT are sliced, dried and crystallized, and then fused separately and subjected to extrusion molding through a parallel-type spinneret plate; oil is applied after cooling; then level 1-3 drafting and heat setting treatment are adopted; and during drafting, a total drafting rate is controlled to be 3 to 3.5, wherein the level-1 drafting rate is 2.8 to 3.0 at a temperature controlled to be 75 to 80° C., and the drafting rates of the remaining levels are 1.0 to 1.5 respectively at a temperature of 75 to 80° C.; the drafted filaments are subjected to dynamic heat setting treatment to obtain the PET/PTT parallel complex filament with high self-crimpiness, wherein an intrinsic viscosity of the PET raw material is 0.60 to 0.65 dL/g, an intrinsic viscosity of the PTT raw material is 0.90 to 0.96 dL/g, and a spinning temperature of a spinning molding is 270 to 275° C.; a winding rate of the fiber is 3600 to 3900 m/min; the dynamic heat setting refers that the filament is wound on a rotating heat roller or passed through a high-temperature hot plate to obtain transient setting; and the dynamic heat setting is performed at a temperature of 152 to 156° C. for 20s to 30s;
wherein the PET/PTT parallel complex filament with high self-crimpiness has a monofilament linear density of 2 to 3 dtex, a breaking strength of 3.2 to 3.5 cN/dtec, a breaking elongation of 25 to 45%, an elastic recovery rate of 40 to 45%, and a crimping rate of 45 to 49%.
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