fabric poly l lactide having a viscosity average molecular weight of 450 000 was dissolved in methylene chloride to prepare a spinning dope the spinning dope was stored in the main tank 1 quantitatively measured by the metering pump 2 and supplied to the spinning dope drop device 3 of fig2 thereby discontinuously changing flowing of the spinning dope thereafter the spinning dope was supplied to the nozzle block 4 having a voltage of 50 kv and spun in a fiber shape through the nozzles the spun fibers were collected on the collector 6 to prepare a non woven fabric web having a width of 60 cm and weight of 6 9 g m 2 here each nozzle block included 400 pins and 20 nozzle blocks were aligned model ch 50 of symco corporation was used as the voltage generator the output rate per one pin was 0 0026 g min and thus a throughput was 20 8 g min one nozzle block was divided into 10 and one spinning dope drop device 3 was installed in every 40 pins a drop speed had 3 2 second intervals the non woven fabric web was transferred and embossed at a speed of 5 m min to prepare a non woven fabric table 1 shows tensile strength and tensile elongation at break sem of the prepared poly l lactide non woven fabric was shown in fig8 poly glycolide lactide copolymer mole ratio 50 50 having a viscosity average molecular weight of 450 000 was dissolved in methylene chloride to prepare a spinning dope the spinning dope was stored in the main tank 1 quantitatively measured by the metering pump 2 and supplied to the spinning dope drop device 3 of fig2 thereby discontinuously.