High pressure capillary rheometry on wood plastic composites with variation of wood content and matrix polymer
|High pressure capillary rheometry on wood plastic composites with variation of wood content and matrix polymer|
|Autor||Nico Laufer, Harald Hansmann, M. Koch|
|Tagung/Veranstaltung||58th Ilmenau scientific colloquium|
|vom||08. September 2014 bis 12. September 2014|
Wood Plastic Composite (WPC) is a composite material made from wood fibers (fine chip, wood shavings or wood flour) and a thermoplastic matrix polymer. Matrix polymers are mainly polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC). The wood content of WPC varies, depending on the applied method of processing, between 50 and 75 wt%. The flow behaviour of WPC melts is of decisive importance for their processability. Understanding rheological behaviour shall help to increase the efficiency of processing of WPC products due to increased material throughput. Furthermore it helps to simplify the development of new WPC products and extrusion tools respectively. This paper describes how various WPC formulations were examined on the basis of high pressure capillary rheometry (HKR). It could be shown that the flow behaviour of these WPC melts can be well described by functions based on the power law. Furthermore the measurements also confirmed a good correlation between flow exponent and consistency factor.