Optical sorters using light and near-infrared technology are part of a new upgrade to one of Auckland’s recycling plants which will allow for more plastic to be processed in the country, says Stuff. With the upgrade, about 35 per cent of the plastic picked up from Auckland’s kerbs will be recycled in New Zealand, a big jump from before when almost all of it was being sent overseas, according to an Auckland councillor. A second upgrade is expected next year which will allow the processing of fibre and paper.