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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 stationary online measuring
Infra-Red optic was developed by IoSys 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 fields. It allows direct analysis
of non-dark-colored plastic parts 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 that spectral region. The polymer
sample is radiated with a infrared light and the reflected light of the
measuring place is analyzed using a near infrared detector array.
For plastic
identification the samples are quickly passed by - e.g. using a
conveyer belt - below the optical focus lens. The light focus of both
movable NIR light sources can be adjusted for a distance from 50 up to 150
cm. The identification result is generated
by an integrated relay-
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interface
board as an output signals for sorting systems. Polymer types and the
corresponding relay positions can be set individually. Furthermore the
result can be shown |
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online on a
VGA screen. The portable sIRoLine device which can be carried on its
handle includes the optical NIR-system and the computer, which
controls and evaluates the identification process. Parameter settings
like model selection can be set by the LCD-touch display. Additional
connections like a serial interface allow external data transfer. As
optional feature a LED array visualizing the identification
result is available. (dimension in mm: 720 x 120 x 150, weight: 4 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%.
For detailed
spectra viewing, loading, saving, editing spectra etc. an external
keyboard and a VGA-Display can be connected.
With the help of
the Near Infra-Red optic it is possible independently of surface
structure, moisture and contaminations to analyze relevant household
plastics as following:
There is the option to identify further polymer types as following using a
NIR-spectrometer with higher spectral resolution:
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PA6x, PA12, ABS, PPO, PCA, PBT, PC, PMMA, POM |
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