Recycling symbols help to identify materials for correct recycling

For most people, recycling decisions happen at home: a symbol on a package is the cue for which bin an item goes in. These cues are useful – they nudge consumers towards separating materials at source, which is an essential first step in any recycling system. But they are only the first step. What actually determines whether an item gets recycled, and into what, depends on what happens after it leaves the household: the sorting process at a Material Recovery Facility.

Recycling symbols

Household collection systems are necessarily simplified – most schemes ask residents to separate broad categories such as paper, glass, plastics and metals, sometimes mixed together in a single "dry recyclables" stream, guided by the recycling symbols printed on packaging. Within that stream, dozens of different materials, polymer types, colours and formats arrive mixed together at the sorting facility, often contaminated with food residue, labels, caps of different materials, and items that should not have been included at all.

This is where industrial-scale material identification takes over from consumer-facing symbols. Sorting plants need to make thousands of accurate decisions per minute, and they cannot rely on reading printed labels – many of which are missing, dirty, or simply too small to detect at line speed. Instead, optical sorting technology identifies each item by its actual physical and chemical properties: near-infrared spectroscopy reveals polymer composition, cameras assess colour and shape, and increasingly, AI-based vision systems recognise object types directly, the way a person would, but at far higher speed and consistency.

Different materials, different symbols

Different material families – plastics, glass, metals, paper, textiles – carry different symbols and follow different recovery routes once sorted. The quality of material identification at the sorting stage has a direct impact on what happens next. A stream of PET bottles contaminated with PVC, for example, can compromise an entire batch of recycled material, making it unsuitable for high-value applications like food-grade packaging. Conversely, a sorting line that can reliably separate materials by precise type – not just broad category, but specific polymer, colour and form – produces output streams clean enough to be sold as high-quality secondary raw materials, closing the loop back into new products.

This is the gap that PICVISA's optical sorting range is designed to close. ECOPACK for plastic packaging, ECOGLASS for glass by colour, ECOSORT TEXTIL for textile fibres, and ECOFLAKE for post-shredding plastic flake all perform the precise, high-speed material identification that turns a mixed recyclables stream into the clean, well-characterised material flows that recyclers, manufacturers and brand owners actually need. So the next time you check a recycling symbol before putting something in the bin, remember: that small triangle starts the journey, but it is the sorting technology behind the scenes that determines where the material ends up.

Explore our optical sorting range