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Transfercenter für Kunststofftechnik Ihr Partner für fertige F& E Lösungen. Utilizing unbleached cellulosic fibres in polypropylene matrix composites for injection moulding applications. C. Burgstaller

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Transfercenter für Kunststofftechnik

Ihr Partner für fertige F&E Lösungen

Utilizing unbleached cellulosic fibres

in polypropylene matrix composites

for injection moulding applications

C. Burgstaller

Second International Conference on Innovative Natural Fibre Composites for Industrial Applications, 15-18. April 2009, Rome

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


Overview l.jpg
Overview

  • Introduction

  • Aim of the work

  • Materials & Methods

  • Results

  • materials characterisation

  • part testing

  • Conclusions

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


Introduction l.jpg
Introduction

  • over the last years, interest in using cellulose based fibres increased

  • fibres considered were:

  • bast fibres, e.g. hemp and flax

  • leaf fibres, e.g. sisal and abaca

  • fruit fibres, e.g. coir

  • wood “fibres” and particles as well as sawdust

  • and many more

    all these show several advantages, like renewability, low density, less abrasion of machinery, good price/performance ratio, …

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Introduction

  • the main issues with these fibres are

  • to obtain constant quality

  • to process them with standard thermoplastic processing machinery

    fibres, which do not show these disadvantages

    are pulp fibres from wood

    these are separated through the pulping process

    from each other, which results in very uniform

    fibres (diameter ~ 20µm, length ~ 1 – 5 mm)

    further advantages

  • the constant quality is delivered the whole year

  • certified sustainable fibres

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Aim of the work

  • investigate the reinforcing effects of unbleached pulp fibres in polypropylene

  • compare these composites with ‘standard’ composites like glass or talc reinforces polypropylenes, via:

  • materials characterisation

  • part testing

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Materials & Methods

raw materials

polypropylene homopolymer (MFR ~ 8 g/10min)

compatibilizer (maleic anhydride grafted PP)

unbleached Kraft pulp fibres

15, 30 & 45wt% fibre were compounded into the matrix (referred to as ZS15, ZS30 & ZS45)

reference materials

commercial grades

20wt% of talc (Tv20) in PP

20 & 30wt% glass fibres in PP (GF20 & GF30)

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Materials & Methods

the compounds and the reference materials were injection moulded to yield:

universal test specimen

for characterising elastic modulus, tensile and impact strength

L-shaped parts

for part testing in three different loading modes

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Mechanical characterisation

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Mechanical characterisation

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Mechanical characterisation

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Part testing

three different loading modes were realised with this setup

to assess different regions of the part, for getting an idea how the materials will perform in application

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Part testing

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Part testing

fibre orientation in nook of the L-shaped part for GF30 (left) & ZS45 (right)

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Part testing

glass fibre orientation in the skin layer (left) & core layer (right)

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Part testing

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Part testing

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Conclusions

in general, pulp fibres are appropriate for reinforcing polypropylene for injection moulding applications

although the results from mechanical characterisation are slightly lower than for glass fibre reinforced polypropylene, part testing showed that the wrinkling of the pulp fibres can be advantageous

tensile strength and modulus are comparable to the glass fibre reinforced grades, nevertheless there is some work to do in regard to impact modification

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Acknowledgements

our partners in that project

European Project IP 515769-2 BioComp for the use of the edge protector mold

my co-workers at the TCKT, especially

Mr. B. Rathner for the aid in Moldflow simulations

the organisers for this conference

Thank you for your attention!

©TCKT, C. Burgstaller, 15-18. April 2009, Rome


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Contact

Transfercenter für Kunststofftechnik

Dr. Christoph BurgstallerResearcher & Project Leader

Transfercenter für Kunststofftechnik GmbH

Franz-Fritsch-Straße 11 · A-4600 Wels

Tel: +43(0)7242/2088-1017Fax: +43(0)7242/2088-1020e-mail: christoph.burgstaller@tckt.atwww.tckt.at

Transfercenter für Kunststofftechnik GmbH

Franz-Fritsch-Straße 11A-4600 WelsTel: +43(0)7242/2088-1000Fax: +43(0)7242/2088-1020e-mail: office@tckt.at

©TCKT, C. Burgstaller, 15-18. April 2009, Rome