- Granulators
for plastic recycling.
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- Everybody
knows granulators.
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- What
everybody doesn't know is there is a huge difference
among different manufacturers.
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- Granulators
are, by nature, high maintenance machinery, for
the simple fact they normally receive dirty
materials and dirt, easy to understand, is wearing
out everything.
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- Actually,
doesn't matter if you run it dry, wet (with water
aid) with a big screen, to decrease residence time
and consequently residence time. (residence
time = wearing time)
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- True
that hard steel helps a lot but, unfortunately it
cost a lot first and into a machine that has a lot
of vibrations it may cause some more problems.
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- So,
the very first thing to ask when buying a granulator
is which is the clamping system of rotating and
fix blades, to decrease as much as possible blades
replacing time.
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- This
machine is, in fact, the one that gives the most
of downtime to the entire system and downtime costs
a fortune, or a little more.
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- Because
granulators have an high speed rotor, the machine
should be protected as much as possible from receiving
hard materials like steel, stones etc. (yeah, it
sound obvious but it isn't) and this can be obtained
adding some simple devices before it.
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- The
most common are Metal Detectors and trommels to
avoid metals in the first case and stones in the
second.
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- And
if you expect some different contamination
you are afraid of, you better be prepared to replace
the rotor or the complete machine.
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- Something
else that can be very useful, is a set of anti-vibration
pads under it; this will decrease the noise of the
machine first and life of the machine will be much
longer than you expect.