speed controller 10 and a certain temperature is maintained with the heater 5 the sol 6 is dropped into the cylinder 3 with a constant viscosity by using the pressure member 2 which is operated by the outside pressure manner the dropped sol 6 is spun through the sieve and short fiber 13 are continuously manufactured the present invention will now be described in more detail in connection with the following examples which should be considered as being exemplary and not limiting the present invention after introducing 4 mole of iso propanol in a 3 neck flask at the room temperature 1 mole of aluminum sec butoxide is dropped slowly during 6 7 minutes the solution becomes an opaque sol and 0 5 mole of acetylacetone is added by using a pipet to make a clear sol in a stirrer it takes about two hours to complete the acetylacetone reaction and then 1 mole of water is added at this time the color of the sol changes colorless or still the transparent color remains for complete hydrolysis the sol is agitated for 1 hour and then 0 0015 mole of hydrochloric acid is added the following tables 1 and 2 show.