In a process for producing fine monofilaments having improved abrasion
resistance from a polypropylene having a melt flow index
(MFI).sub.230.degree. C./2.16 kg of 2 16 g/10 min at a linear density of
5 20 dtex (0.027 mm 0.053 mm), a compound consisting of 80 to 99.9% by
weight of chips and 20 to 0.1% by weight of an additive is added to the
extruder, the melt is spun at a speed of at least 1200 m/min, the fibre
is cooled in an air bath at room temperature, supplementarily stretched
at a temperature of 110 150.degree. C. to a linear density of 5 20 dtex
and wound up.The monofilaments comprising a polypropylene having a melt
flow index (MFI).sub.230.degree. C./2.16 kg of 2 16 g/10 min, having
improved abrasion resistance, and a linear density of 5 20 dtex (0.027 mm
0.053 mm) and an abrasion resistance score .ltoreq.2. The monofilaments
have a tenacity of at least 48 cN/tex and an elongation at break of less
than 45% for a mechanical constant (constante mechanique) of at least 295
cN/tex and a specific work to break value of more than 61.5 cNcm/dtex.The
fine monofilaments according to the invention are useful for producing
woven screen fabrics for filtration and screen printing without abrasion
deposits.