is passed through a hot air box 72 at a temperature not higher than the high melting point of the filament component of the spun bonded and meltblown composite fabric layers so as to solely heat bond the filament component of the lower melting point after heat treatment the laminate is taken up via a rolling up device 90 because after the heat treatment with the hot air box 72 the filaments having high melting point in the fabric layers are not subjected to heat bonding the non woven fabric thus produced has a loose and soft structure referring to fig3 there is shown another apparatus according to the present invention which includes an advancing forming screen 22 a first spun bonding spinning device 30 a first melt blowing spinning device 40 a second melt blowing spinning device 50 a second spun bonding spinning device 60 and a depositing unit which includes a suction device 23 disposed below the forming screen 22 the spinning devices 30 40 50 60 are disposed successively adjacent to and along the advancing direction of the forming screen 22 so as to extrude a plurality of filament material of different types on the forming screen 22 as with the previous embodiment the spinning devices 30 40 50 60 can be selectively activated to form a non woven fabric with a desired number and desired types of fabric.