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High level
material plastic recycling demands that plastic materials must be
sorted according to various types. IoSys - Dr. Timur Seidel e.K.
has taken part in solving the problem. A mobile Infra-Red optic was
developed by IoSys for identifying plastics. It will help to make further
amounts of waste polymers available for re-use.
With the
technique of the so-called near Infrared spectrometry (NIR) it is possible
to identify plastics coming from the household-, engineering electronics
and automotive application field. It allows direct analysis of
non-dark-colored plastic parts (films, foils, granules, solid, foamed)
and other materials like carpets and textiles.
The basic
principle of the method is the diffuse near infrared reflection
spectroscopy whereby characteristic absorption behaviors
of different polymer types
are
used
in thatspectral region.
The polymer s ample
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is radiated with
a infrared light and the reflected light of the measuring place is
analyzed using a near infrared detector array. To measure transparent
materials a white ceramic is used which must be placed behind the sample
as a reflection mirror. |
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For plastic
identification the measuring head is simply pressed on to the analysis
sample. The measurement begins by pressing the start button on the
pistol grip. After one second an integrated color screen
displays the recognized
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polymer. The
handheld measuring head is equipped with the NIR-source and a 2 m
cable connected to the instrument. The portable device includes the
optical NIR-system, the computer, which controls and evaluates the
identification process. Parameter settings, as well as a detailed
spectra view, can be set by using an integrated touch panel.
Additional connections like an external keyboard and a serial
interface allow external data transfer. As optional features a
Mini-Plotter printing out the result, an external Relay-interface board
generating output signals
for sorting systems and
an external light
source module (e.g. direct measuring of
bottles) are available. (dimension
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in mm: 364 x 195 x 316, weight: 8
kg, power supply: 100-230 Volt~, 50/60 Hz). |
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Identification
of different plastic types is the result of a trained pattern
recognition. After the measurement of the plastic sample the optical
information (absorption bands of overtone- and combination vibrations) are
processed by a neural network. The result of the calculation is a list of
the most probable polymer type identified within a probability of 0 and
100%.
The possibility
to display the resulting spectra in detail by connecting an external
VGA-display allows to develop own applications easily (e.g.
identifications of carpets, textiles, food etc.) or to find out
particularities (blends).
With the help
of the mIRo system it is possible independently of surface
structure, moisture and contaminations to analyze within 1 second
as following: PA6x, PA12, PE, PP, ABS, PS, PPO
PCA, PBT, PET, PC, PMMA, POM, PVC
According to
different demands in recycling matters, customers can arrange to have the
system calibrated using their own samples. |
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