FRICTIONAL BEHAVIOR OF BIOPLASTICS AT SCREW SURFACES UNDER PROCESSING CONDITIONS

Christian Kneidinger, Keyan Liu, Gernot Zitzenbacher, Klaus Bernhard Steinbrecher

Research output: Contribution to conferenceAbstract

Abstract

Bioplastics and Wood Plastic Composites (WPC) are quite new Materials. The optimization of processing is a critical factor for the products´ functional properties and also for the energy efficiency of the process. In this work the external coefficient of friction (ECOF) of Polylactic acid (PLA) pellets and two different WPC pellet types, a Polypropylen (PP) based and a Polyvinylchloride (PVC) based WPC, is presented. The ECOF is investigated at a pressure between 4 and 200 bar and a velocity from 0.1 to 1.2 m/s. A polished and a grinded stainless steel surfaces are used for the experiments. The ECOF of PP based WPC is in the range from 0.15 to 0.34 at both surfaces. For the PVC based WPC the ECOF decreases from 0.38 at low pressure to 0.16 at 200 bar. The ECOF of PLA is about 0.1. Only a slight dependence on pressure and velocity can be observed. Apparently significant differences occur for the frictional properties of PP and PVC based WPC. Furthermore, the frictional behavior of WPC deviates significantly from the matrix homopolymers.
Original languageEnglish
Publication statusPublished - 2012
EventPolymer Processing Society (PPS) Americas conference 2012 - Niagara Falls, Ontario, Canada
Duration: 21 May 201224 May 2012

Conference

ConferencePolymer Processing Society (PPS) Americas conference 2012
Country/TerritoryCanada
CityNiagara Falls, Ontario
Period21.05.201224.05.2012

Keywords

  • FRICTION
  • BIOPLASTICS
  • Tribology

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