Abstract
The objectives of this study were to examine the effects of fiber content and extrusion parameters on flax-fiber-reinforced polyethylene composites and to determine the optimum values for the same. The flax fibers were chemically pretreated, ground, and mixed with powdered polyethylene. The mixture was extruded, pelletized, ground, rotationally molded, and cut into test specimens for testing and characterization. Superposition surface methodology was then applied as optimization technique. Optimum values were fiber content = 6.25%, barrel zone temperatures = 75, 117, 127, 137, and 147 °C, and screw speed = 118 rpm for linear low-density polyethylene (LLDPE) composites; and fiber content = 5.02%, barrel zone temperatures = 75, 118, 128, 138, and 148°C, and screw speed = 126 rpm for high-density polyethylene (HDPE) composites.
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