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SORTING | INNOVATION


pigment show that this pigment absorbs the majority of the NIR energy, resulting in a very low percentage of reflectance and a reflectance curve that has lost all the spectral fingerprint features to determine the plastic type. It is therefore unrecog- nisable and sorting for recycling is not possible. This was also confirmed with the microPHAZIR scanner. In order to gather real world confirmation


regarding the ability to identify plastic objects by plastic type, packaging materials that are com- monly used by consumers, such as bottles, contain- ers, trays, lids and caps were gathered from supermarkets and analysed; a total of 88 black, white and coloured objects. It was found that 41 black objects marked as being based on HDPE, PP, PET and PS, had no distinguishable features in the NIR reflectance curve and could also not be identified by the microPHAZIR for its plastic type. However, one object, a black PET shampoo bottle, could be identified with a high correlation coefficient. The majority of the black plastic objects that


represent typical consumer packaging goods could not be identified for plastic type and therefore hinder recycling. It is believed that all those plastics


objects that could not be identified contain carbon black as a colorant. The one black PET shampoo bottle that could be identified is believed to be coloured with colorants other than carbon black. Clariant has worked on finding alternative black solutions and has developed (among others) the following products for the black coloration of a wide range of plastics including those most common in packaging applications (PE, PP, PET and PS): Graphtol Black CLN; Solvaperm Black PCR; Polysynthren Black H. Evaluation of the moulded chips with the


alternative black colorants show that the unique characteristics in the curve of the plastic remain visible and the plastic remains identifiable. The darkness of carbon black is not easily


matched as the alternatives in general show higher lightness. The relevance of the aspect will depend on the application and requires communication between the raw material supplier and the processor.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.clariant.com � www.thermofisher.com


HIGH QUALITY COMPOUNDS BASED ON RECYCLED PLASTICS BECAUSE WE CAN


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FAKUMA stand no.


B1/1309 Welcome!


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