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Effects of Processing on Mechanical Properties of Polypropylene Composites

Based on the mechanism of processing and molding of multivariate polypropylene composite system, this paper studies the effect of the screw length-to-diameter ratio and the wedge angle of the helix angle of the twin-screw extruder on the properties of elongation at break of polypropylene composite. The relationship between injection temperature and injection pressure of injection molding machine is also analyzed. Experiments show that when length-to-diameter ratio is 30, and wedge angle is 16±5o, the elongation at break of test sample reaches its maximum value and tends to be stable. When melting pressure is 40 MPa and the injection temperature at 190 °C-220 °C, injection molding machine can improve the process flowing property of composite materials.