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Q: Is the
quality of the PP fibre composite less than that of glass fibre PP?
A: No, the
stiffness and strength quality is comparable to that of glass fibre
reinforced PP.
The impact properties are a little lower but can be compensated by using
impact modifiers. See
fact sheet
for more detailed information
Q: How
does the price of those PP fibre composites compare to that of virgin PP
and that of glass fibre reinforced PP?
A: The
glass fibre replacing grade seems 450 €/ton cheaper that of glass fiber
reinforced PP; the filler grades 250-300 €/ton cheaper than commercially
filled plastics.
Q: Do the
resulting natural fibre plastic granules smell and attract water?
A: No, they
do not attract water. Yes, they do smell. However, the smell can be masked
and the odour emission/fogging characteristics are accepted by
the automotive industry [ref. "Emmissions and odour of natural fiber
composites in automotives, legal requirements - measuring methods -
results", W. Witek et al., 5th Global wood and natural fiber
composites
symposium, April 27-28, 2004 in Kassel.]
Q: Is it
possible to process the granules with conventional equipment?
A: Yes,
conventional twin-screw extruders, preferably co-rotating, can be used
to produce the granules. The technology has been developed on W&P and Berstorff equipment.
Q: How can
you compound PP and other plastics at the common temperatures and not burn
the natural fibers?
A: The
fibres do not burn below 210 degrees centigrade; higher temperatures
give smoke production, which is due to glues within the fibres, but do
not significantly harm the fibres. Best properties are achieved by
processing under 200 degrees centigrade.
Q: Do I
need more information than described in the patent in order to produce the
material with the excellent properties as described here?
A: Yes. You
especially need background knowledge concerning typical processing
conditions. We have this information available.
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