Investigation of Post-Consumer Regrind Content in Polyethylene and Polypropylene for Consumer Packaging Applications

With the rise of plastics products in waste streams, both consumer products companies and consumers are looking for greener methods to produce the same products with less of a carbon footprint. One way of achieving these goals is to include recycled plastic into consumer goods. These recycled greener alternatives provide many of the same benefits of virgin plastic material. The goal of this project was to determine what, if any, differences are there between virgin resins and resins that contain post-consumer recycled content (PCR). Control and experimental resins were obtained and injection molded to create samples for analysis. Control resins were Ineos H05A-00 Polypropylene Homopolymer and Marlex 9012 High-Density Polyethylene. Experimental resins included Plastic Bank SDS clear polypropylene (Social Plastic), KWR-621 Post Consumer Recycled FDA Polypropylene Resin, and KW Post-Consumer Recycled Polyethylene Resins: KWR 102 BM High-Density Polyethylene and KWR 101 150 Natural High-Density Polyethylene. Samples underwent thermal testing by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) to determine key thermal transition and material degradation temperatures to compare each of the experimental materials to the virgin resins. Mechanical testing included tensile testing and Izod impact testing to determine the mechanical strength of each experimental materials to compare to the virgin resins. Melt flow was performed to determine the rheological properties of the virgin and post-consumer recycled (PCR) resins in the melt