Basalt fibers are efficient reinforcing fillers for polypropylene because they increase both the mechanical and the tribotechnical properties of composites. Basalt fibers can compete with traditional fillers (glass and asbestos fibers) of polypropylene with respect to technological, economic, and toxic properties. The level of mechanical properties of reinforced thermoplastics depends on numerous factors. Two of them a~re the most important, namely the adhesive strength of a polymer-fiber system and the residual length of a reinforcing filler in the composite after processing [i, 2]. It is obvious that these factors depend on the technological features of introducing the fibers into the polymeric matrix. The method of combined (screw-disk) extrusion seems to be the most efficient for combining a polymeric binder with a reinforcing t
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