an additive when the fiber is a porous hollow fiber with polygonal cross section the cap of each t lobe is connected to another t lobe or to a non hollow fiber with multilateral cross section when the cap of each t lobe is not connected to another cap the component includes but is not limited to polyester nylon polyolefin poly acrylonitrile pan or cellulose the polyester includes polyethylene terephthalate pet polybutylene terephthalate pbt or polypropylene terephthalate ppt nylon includes n6 or n66 polyolefin include polypropylene pp or polyethylene pe preferably the component is pet the additives include but are not limited to anti bacterial amp mildew retarding agents anti conductive agent anti uv agent or far ir agent the manufacturing method of the present invention is performed by an intubated composite spinning machine 5 as shown in fig2 and spinneret 6 as shown in fig3 a and 3b the intubated composite spinning machine 5 has an inner tube 2 and an outer tube 1 the spinneret of the present invention includes a plurality of square first exits 3 a and 3 b extending outward to form an equilateral polygon and a plurality of square second exits 4 radially arranged from the mass center of the equilateral polygon to each side of equilateral polygon typically there are three square first exits which form an equilateral triangle as.