Process for preparing a non-woven fabric for medical use, comprising the following steps: -performing a spraying process in which -a spray jet is generated from a polycarbonate urethane plastic solution having a viscosity of from 800 to 1500 Pa.s using a spraying unit from which the polycarbonate urethane plastic solution exits; -said spray jet includes at least one strand of a single microfiber that may have a diameter of from 1 to 15 [mu]m, preferably a diameter of from 2 to 10 [mu]m; -said at least one strand of the single microfiber is sprayed onto a support, wherein -the support is moved relative to the spraying unit, or the spraying unit is moved relative to the support; -the spraying process is repeated several times to form polycarbonate urethane microfiber layers; -whereby polycarbonate urethane microfibers formed from the individual spraying processes overlay each other and adhere to each other at the respective contact points; and -a non-woven fabric having a fibrillar microporous structure is formed; -and optionally detached from the support after the last spraying process.