"Whether it's crystallized or blended with other polymers, if handled appropriately like other polymers, Ingeo can be recycled and its properties retained through numerous recycle events," said Frank Diodato, segment director for durables and distribution for NatureWorks. "This is true for both post-industrial and post-consumer Ingeo (engineering) plastics formulations. At the post-consumer level plastics are often mixed, making recycling more difficult, but that's not as common with post-industrial materials."
Although bioplastics have been targeted as "contaminating" the recycling and waste stream, nearly all plastics do, said Davies.
"Bottles in the US are typically made of either 100-percent clear polyethylene terephthalate (PET) or 100-percent white high-density polyethylene, so these are easily identified. They are easy for consumers to identify, and for material recovery facilities (MRFs) to sort manually, and therefore get recycled in very high numbers. By contrast, clear clamshells can be made of PET, polystyrene, or polypropylene, and recyclers need the most modern equipment to distinguish among them. Most of them sort out bottles only and then landfill the rest, or ship it to Asia for sorting, or ship it to end users here for reuse."
Aside from sharing details with MRFs about how to work with its products, NatureWorks also wants to help develop end markets. "Once there are end markets for a material, the MRFs will be happy to sort it." said Davies. For example, traditional plastics compounders buy different plastics feedstocks and mix them together to make value-added blends. Some of them are interested in buying NatureWorks' recycled polylactic acid (PLA) bioplastics. BioCor, for example, already buys post-industrial and post-consumer PLA scrap, both petro-plastic and bioplastic.