The invention discloses a preparation method of triangular hollow polyester staple fibers and a spinneret plate for preparing the triangular hollow polyester staple fibers. After mixing and drying spinning raw materials, melt spinning is carried out, and primary triangular hollow polyester fibers are extruded through a profiled-hole spinneret plate, followed by winding, filament falling and bundling in sequence, oil bath drafting, steam drafting and crimping, and finally relaxation heat setting. In this preparation method, the spinneret plate adopts arc-shaped openings with concave surfaces facing outward. Extrusion swelling occurs during spinning to make the concave surfaces basically flat, and the fiber cross-section can well maintain a regular triangular shape. Compared with the existing profiled cross-section hollow technology, the triangular hollow fibers produced by the method of the invention have excellent planar reflection effect and glossiness, improve the gloss and application effect of fabrics, enhance softness, and have excellent thermal insulation performance and stable and efficient low-frequency sound insulation function. The fiber hollowity can reach 30%-40%, the profiling degree is 50%-60%, the hollowity and profiling degree are stable, and the bulk density is low, presenting comprehensive competitive advantages.

Area Code: CN

Application Number: CN201110437847.2