Preparation method of triangular hollow dacron short fiber and spinneret plate for preparing triangular hollow dacron short fiber

The invention discloses a preparation method of a triangular hollow dacron short fiber and a spinneret plate for the preparing triangular hollow dacron short fiber. Melting spinning is performed after mixing and drying of a spinning raw material, a nascent fiber for preparing triangular hollow dacron is extruded through the special-shaped hole spinneret plate, winding, filament dropping and bunching are performed in sequence, and finally flabby heat setting is performed after oil bath drafting, steam drafting and curling. In the preparation method, an arc-shaped open hole is adopted on the spinneret plate, the concave surface is outward, extruding swelling occurs during the spinning process, the concave surface is substantially a plane, and a fiber section can maintain an equilateral triangle shape well. Compared with an existing special-shaped section hollow technology, the plane of the triangular hollow dacron produced by the preparation method is good in light reflection effect and glossiness, gloss and application effects of fabrics are improved, soft effects are improved, thermal insulation is excellent, stable and efficient low-frequency sound insulation functions are provided, hollow rate of the fiber can be 30%-40%, the special-shaped degree can be 50%-60%, the hollow rate and the special-shaped degree are stable, the volume density is low, and good advantages are provided.