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Fundamental mechanisms of the pultrusion process using commingled yarns of polypropylene matrix and discontinuous    flax fiber to produce thermoplastic profiles were investigated in numerical and experimental manners. Essential issue is the    fact that all natural fibers are discontinuous by nature, which may negatively influence the processability. The pultrusion    process will be only successful if the pulling force exerted on the solidified pultrudates can be transmitted to the regions of    unmelted commingled yarns by “bridging over” those melted regions within the die. This can be realized by applying    a sufficient number of small yarn bundles of high compactness rather than a thicker single bundle of lower compactness    as the raw material. Furthermore, the possibility of adding extra melt into the yarn bundles by side-fed extrusion has been    investigated showing that the impregnation can be improved only for the outer layers of yarns, which is owed to the high    viscosity of the thermoplastic melt and the limited length of the die

Processability of Pultrusion Using Natural Fiber and Thermoplastic Matrix