Multicomponent, micro- and nanofibres Ultra-fine fibres, defined as fibre fineness less than 0.8–0.9 dtex (0.7 den), were produced as fine staple fibres of random length by melt blow spinning and flash spinning in the late 1950s. The production of ultra-fine filaments was developed by DuPont and Toray in the 1960s by using the technology of
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