Melt-blown fiber web having improved elasticity and cohesion, and manufacturing method therefor

1. A method for producing a melt-blown fiber web for a sound absorption material, the method comprising extruding a thermoplastic resin composition through an extruder;

spinning the extruded thermoplastic resin composition together with a high-temperature and high-pressure gas to form thermoplastic resin microfibers;

air-blending the thermoplastic resin microfibers with non-circular cross-sectional hollow conjugated staple fibers to form filaments;

producing a melt-blown fiber web by forming one portion of the filaments into a horizontal fiber layer and consecutively forming a vertical fiber layer on the horizontal fiber layer by bringing the other portion of the filaments into contact with a stack pattern change unit; and

winding the produced melt-blown fiber web,

wherein the melt-blown fiber web comprising 10 to 50 wt % of thermoplastic resin microfibers and 50 to 90 wt % of non-circular cross-sectional hollow conjugated staple fibers with respect to the total weight of the melt-blown fiber web, and

the non-circular cross-sectional hollow conjugated staple fibers are polygonal or tubular in cross section or have a protrusion/depression pattern at an outer circumferential portion thereof, have an enlarged specific surface area, have a single fiber fineness of 1-50 denier, and a hollow ratio of 10% or higher, and

70% to 90% of the microfibers have a diameter of 10 μm or less and 10% to 30% of the microfibers have a diameter of 3 μm or less.

2. The method of claim 1 , wherein the vertical fiber layer is consisted of peaks and valleys, which have a height of 2 to 50 mm and are arranged at irregular intervals.

3. The method of claim 1 , wherein fibers at a top of the vertical fiber layer are entangled with one another to form an uppermost portion of a waved fiber web.