COLOURS | MATERIALS


Using colour to transform post-consumer plastics


Colouring of plastics needs to meet sustainability requirements while also addressing performance challenges. Chris Saunders looks at how colour companies are finding solutions


To improve the aesthetic appearance of post-con- sumer recycled (PCR) materials, adding colour is an important process. However, achieving consistent colouring is often hindered by the varying quality of recyclate and different processing techniques. With other considerations ranging from sustainabil- ity goals to adhering to constantly evolving regulations, effective colouring presents a never- ending series of challenges for converters and recyclers. Colour will vary strongly in recyclate due to the uneven mix of post-consumer materials in a typical waste stream. This is why QolorTech developed ReQolor, which employs a robust colour package system to ensure high tolerances and maximise the use of recyclate. Using colour masterbatches allows brand owners to achieve the exact shade and tone they desire, ensuring consistency across all their products and packaging. This is important so consumers can easily recognise their favourite products on crowded


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shelves and can be particularly problematic for brands with a large product range. In addition, colour masterbatches can help brand owners meet regulatory requirements in industries which have specific regulations governing the use of certain colours in their products and brand owners need to ensure they comply with these regulations in order to avoid potential legal issues and costly recalls. “Colour masterbatches are important for brand owners for several reasons,” says Heiko Rochholz, Head of Marketing at QolorTech. “First and foremost, colour plays a crucial role in creating brand identity and recognition. The right colour can help to convey the values, personality, and message of a brand, and can help to establish a connection with consumers.” Avient and Borealis announced the results of a joint study in late 2022 addressing the challenges of colour matching in PCR for rigid packaging, offering several options that can aid colour


Main image: A joint study involved the use of Borcycle M recycled PP from Borealis in tandem with Avient colorant formulations and its PCR Color Prediction Service


November/December 2023 | PLASTICS RECYCLING WORLD 11


IMAGE: BOREALIS


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