- Film recycling.
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- Film
is normally used for packaging purposes and it is
produced and collected by millions of tons per year.
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- Types
of film that can be found on the market are very
many and the most common, as far as recycling concern,
are LDPE, HDPE, PP and PET.
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- Films
are generally pretty easy to be washed while cutting
and drying represent the difficult part of any system.
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- Machinery
for a film washing line can vary a lot according
to average thickness, type and quantity of contamination,
throughput and final application of flakes/pellets.
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- Talking
about LDPE film washing, what everybody wants to
get to is a material good to blow film again, and
most of the time it's possible.
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- If
you're looking to blow film after washing and separating
film from garbage collection you'll never, ever
get a pellet good for film applications. Period.
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- Let's
start from the beginning:
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- First
of all material should be ground to a proper dimension;
- the
right dimension is the one your pelletizer can accept.
- The
smaller the dimension, the better for any force-feeding,
the worse for the granulator from energy, size and
maintenance point of view.
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- Cutting
film is not the easiest thing in this world, it
is expensive, noisy and most of the times, this
is the part of the system that let you down because
of very different reasons.
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- The
right choice is, most of the time, the expensive
one from investment point of view but when you go
to the "cost per kilo" situation, you'll
find out that a good machine makes you save money
in the long run.
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- 99%
of films are easy to wash, and washing can
be done in many ways.
- Also
in this case, it depends by the kind and quantity
of contamination you expect and the final application
of the clean material.
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- Washing
lines are normally equipped with one or more sink-float
tanks for separation of flakes from other plastics
and some kind of dirt; sink-float tanks are also
used for rinsing purposes.
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- The
second difficult step is drying instead.
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- The
"conosseurs" know what we are talking
about; specially when the raw material is thin,
and for thin we mean 20 microns (of a millimeter),
or less, everybody is in trouble.
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- At
this point, some guys come up with a lot of damn
complicated machines or systems to "improve"
drying effect with the only result to improve their
bank account but leaving the customer with his unresolved
problem.
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- Somebody
did it even worse, installing some few hundreds
kW of heater bands making the cost of drying sky
high.
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- Customer
problem anyway.
- Isn't
it ?
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- We're
not wizards but we can come up with something you
do not expect:
- a
stupid mechanical centrifuge dryer that will deliver
flakes with a moisture content 1/3 of whatever you
get right now with your existing machinery.
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- If
you fill the form with all data, we'll tell you
what we can give you in terms of quantity and quality.
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- FORM
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