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PELLENC ST & AMPACET JOIN FORCES TO RECYCLE BLACK PET

September 26, 2022 / Becca Watt


Pellenc ST and Ampacet, respectively global leaders in sensor-based sorting
solutions and Masterbatch solutions, collaborated on sorting studies to optimise
the recyclability of dark PET packaging on existing recycling lines.



Since 2021, COTREP has published a test protocol assessing dark packaging
detectability in optical sorting. COTREP is a Technical Committee for the
recyclability of household Plastic Packaging in France, joining forces with
Citeo, Elipso, SRP, and Valorplast.

Standard black polyethylene terephthalate (PET) packaging poses several
challenges for the recycling value chain.

Plastic recycling starts with the sorting of mixed plastic wastes into separate
mono-material streams (e.g., PET, PE, PP, PS…) at material recovery facilities
(MRFs). These facilities use near-infrared (NIR) technology to recognise the
resin type used in plastic articles. The fundamental limitation to near-infrared
optical sorting is its inability to identify and separate plastics that contain
carbon black, the most commonly used black pigment. Carbon black absorbs most of
the infrared spectrum, preventing the backscattering of infrared light to the
NIR spectrometer and consequently blocking the recognition of the resin’s
fingerprint. Such mixed plastic packaging ends in a residual fraction, which is
not recycled but disposed of mainly via incineration.

Ampacet has developed alternative black masterbatch solutions promoted under the
REC-NIR-BLACK brand. Being near-infrared (NIR) transparent, packaging made with
REC-NIR-BLACK can be sorted using conventional NIR optical technologies and
effectively recycled, thus participating in the Circular Economy.

Successful dynamic NIR sorting tests had been performed by Pellenc ST in the
past on black bottles containing REC-NIR-BLACK following COTREP’s sorting
protocol for polyolefin packaging, enabling Ampacet to pass the test for black
masterbatch solutions using these types of resins. But besides the ability to be
detected by NIR and oriented to the proper stream, PET packaging needs to be
sorted in two distinct flows: clear transparent and mixed coloured items. The
mechanical and optical characteristics of the recycled clear PET flakes obtained
from the transparent flow are generally close to the virgin resin. Clear r-PET
flakes are used in a wide variety of high-value applications intended for
contact with food, like water bottles and food containers.

Although PET recyclers are equipped with visible optical sensors to sort PET
streams by colours, the identification of transparent and dark plastic can be
problematic. The reason is that the color detection of the PET container is
realised on black conveyor belts. Therefore, the visible domain spectrometers
installed above the conveyor belts do not necessarily distinguish dark
containers from transparent ones and consequently direct the dark packaging with
the transparent stream. The sorting tests carried out by Pellenc ST on PET
containers coloured with Ampacet REC-NIR-BLACK solutions allowed us to establish
the optimal conditions and adjust the computer algorithm to differentiate
accurately transparent packaging items from dark ones and direct them to the
correct streams. To do so, Pellenc ST used its sorting loop that mimics the
industrial conditions: same mixed plastic stream, throughput. Tests were carried
out using both the previous version of the machine and the brand-new optical
sorter called Mistral+ CONNECT.



Come and visit us at the K fair (19-26 October, Düsseldorf, Germany) . Ampacet
will welcome you in Hall 8A Booth J07 and Pellenc ST in Hall 9 Booth B33.

 

Read more news from Ampacet here.



Ampacet
01952 581814
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