The effect of reprocessing on the mechanical properties of polypropylene reinforced with wood pulp,flax or glass fibre |
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| Affiliation: | 1. Transfercenter für Kunststofftechnik GmbH, Franz-Fritsch-Strasse 11, 4600 Wels, Austria;2. IFG Asota GmbH, Schachermayerstrasse 22, 4020 Linz, Austria;1. Acoustics Laboratory of Le Mans University (LAUM) UMR CNRS 6613, Av. O. Messiaen, 72085 Le Mans Cedex 9, France;2. Laboratory of Mechanics, Modeling and Production (LA2MP), National School of Engineers of Sfax, University of Sfax, BP N° 1173 - 3038 Sfax, Tunisia;3. Le Mans Technology Transfer Center (CTTM), 20 rue Thalès de Milet, 72000 Le Mans, France;1. Department of Mechanical Engineering,Malineni Perumallu Educational Society’s Group of Institutions, Guntur 522 017, Andhra Pradesh, India.;2. Department of Mechanical Engineering, RVR &JC College of Engineering, Guntur 522 017, Andhra Pradesh, India.;3. Department of Mechanical Engineering, Vignan’s Foundation for Science Technology and Research University, Guntur 522 213, Andhra Pradesh, India.;1. Scion, Private Bag 3020, Rotorua 3046, New Zealand;2. VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Espoo, Finland |
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| Abstract: | Composites of polypropylene, substitutable for a given application and reinforced with: Medium Density Fibreboard fibre (MDF) (40 wt%); flax (30 wt%); and glass fibre (20 wt%), were evaluated after 6 injection moulding and extrusion reprocessing cycles. Of the range of tensile, flexural and impact properties examined, MDF composites showed the best mean property retention after reprocessing (87%) compared to flax (72%) and glass (59%). After 1 reprocessing cycle the glass composite had higher tensile strength (56.2 MPa) compared to the MDF composite (44.4) but after 6 cycles the MDF was stronger (35.0 compared to 29.6 MPa for the glass composite). Property reductions were attributed to reduced fibre length. MDF fibres showed the lowest reduction in fibre length between 1 and 6 cycles (39%), compared to glass (51%) and flax (62%). Flax fibres showed greater increases in damage (cell wall dislocations) with reprocessing than was shown by MDF fibres. |
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| Keywords: | A. Fibres A. Wood B. Mechanical properties E. Recycling |
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