Abstract
Commingling process involves the mixing of two types of filaments, viz. reinforcing and matrix-forming filaments in a nozzle with the help of compressed air leading to a homogenous distribution. During compression moulding, close placement of reinforcing and matrix-forming filaments reduces the mass transfer distance of the matrix and ensures proper wetting of fibres resulting in the enhanced properties of the composites. Three types of compression-moulded composites of polypropylene and Kevlar with different Kevlar fibre weight fractions were developed using commingled yarns. Studies on mechanical properties of these laminates confirmed that the composites having higher weight fraction of Kevlar fibre showed better tensile properties. Both abrasive and erosive wear rates showed a strong influence of Kevlar fibre weight fraction. With increase in weight fraction of Kevlar fibre, the erosion wear rate of the composites decreased as Kevlar fibres have higher wear resistance compared with polypropylene matrix. Similar trend was observed also in case of abrasive wear. The composites showed higher wear resistance while abrading the composite with polymer pin in a direction perpendicular to the fibre orientation as compared with abrading in a direction parallel to the fibre orientation.
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