Pigments support recycling processes

Optical sorting of plastic waste is only really successful when it is clearly colorued by pigments. Corresponding scanners thus sort lighter coloured and darker colored plastics, but come up against their limits, especially with the colour black. Black carbon black pigments absorb light waves - so nothing is reflected and subsequently detected. As a result, black plastics often ended up as unsortable waste. But this does not have to be the case. Resourceful companies have now developed a solution. So-called indicator pigments are already metered into the new plastic by Masterbach.

At the end of the life cycle of the plastic part equipped with it, black plastics can also be detected with the associated scanner. Such pigments, such as Bayferrox® 303 T, are (almost) black to the human eye, but reflect sufficient signals in the NIR range, i.e. in the near infrared range, outside the range visible to humans.

Recycled plastics can be excellently lightened with titanium dioxide, coloured black with carbon blacks or coloured red, yellow, brown with iron oxide pigments, or likewise coloured black completely without carbon black.

Unsere Anwendungen im Bereich Plastics Recycling