Method for producing fine denier nylon FDY filament with aromatic function

The invention relates to a method for producing a fine denier nylon FDY filament with aromatic function. The technical problem to be solved is to produce a filament that the filament number is between 0.5 and 1.0dtex, and the aroma retention time is long. In the production method, the weight ratio of three raw materials, namely nylon chips to fine denier nylon masterbatch to aromatic microcapsules is 1:5-20 percent: 0.5-10 percent. The process comprises the following steps of: 1) keeping steady pressure in a spinning component; 2) adopting 40-100-mesh metal sand for filtration; 3) adopting a spinneret plate, wherein the aperture of the spinneret plate is between 0.1 and 0.3mm, and the slenderness ratio is 2-4; 4) arranging an annealing device (1) behind the spinning component, and forming a windless region (2) with the height of between 20 and 40cm between the annealing device (1) and cross air blow (3); 5) ensuring that the position of a beam concentration point is 600 to 1,000mm away from the spinneret plate; and 6) ensuring that the spinning winding speed is between 3,000 and 5,000m/min.