High-density polyethylene/wood fiber composites: Measuring the effect of processing parameters on their physical and mechanical properties

High-density polyethylene (HDPE) is number one in the total amount used for plastic containers and packages. Recycling of HDPE is preferred but it cannot provide the same properties as pure HDPE does. Lately, the addition of natural fiber reinforcement to improve overall performance has been rising. This study investigated the effects of processing parameters (screw speed and position of fiber introduction) on the mechanical properties of HDPE/wood fiber composites. Tensile properties, impact strength, and water absorption were evaluated.; It was found that fiber-loading at port II provided higher tensile properties than at port I. Higher impact strength was obtained when wood fiber was loaded via port I. In the case of screw speed, the highest tensile properties were obtained when a moderate screw speed was used (100 RPM). The highest impact strength and water absorption were obtained when 80-RPM and 120-RPM were used, respectively.