Linearity and non-linearity of mechanical properties in blends of virgin and recycled HDPE's

This paper investigates the behaviour of blends of Recycled Milk Bottle Resin (R-MBR) with Injection Moulding or Film Blowing grade HDPEs (IM-HDPE or FB-HDPE). This was done by measuring changes in mechanical and rheological properties as a function of blend composition and compounding intensity. There were three categories of compounding: bag mixing (BM), single pass single screw extrusion (EBx1) and double pass single screw extrusion (EBx2). The results were examined for linear and non-linear trends, and relationships between morphology, mechanical properties and molecular weights were proposed