PHYSICAL-PROPERTIES OF VIRGIN HDPE AND RECYCLED POLYMERS

The use of recycled polymers in parts is steadily increasing. The prop erties of parts made from recycled polymers differ from those made fro m virgin polymers, due to the degradation mechanisms that have occurre d. Also, when considering a commingled recycled feedstock, the presenc e of several polymers affects the properties of the final part. This w ork looks at the effect of varying compositions of a virgin HDPE blow moulding grade and recycled polymers on the physical properties of the final blend. Two recycled materials are considered, namely HDPE regri nd and a typical commingled recycled feedstock obtained from a municip al waste source. Two mixing techniques are also considered; twin screw extrusion and dry blending.