Friedrichsdorf, Germany - Systems business Ruhl Puromer GmbH, which offers a large range of tailor-made polyurethanes, has announced an innovation in surface technology -- transparent scratch-resistant PU systems, called puroclear.
Conventional transparent PU coatings, which add a high quality optical 3D depth effect to the final part, have been used for some years to manufacture high-class wooden decorative trims for car interiors, with the coating taking place in a closed mould, says Ruhl.
The target for the Friedrichsdorf, Germany-based company was to further optimise the scratch resistance, because, as Dr Ingo Kleba, managing director of Ruhl Puromer says, the first scratches on a car "are a cut to the heart," and one that is repeated "every single morning when you get in the car."
But carmakers also demand ever-increasing efficiency in production, with a target of minimising application of external release agent.
This is a strong requirement when injection moulding using, for example, the Skinform technology for refining thermoplastic parts as decorative trim parts - another interesting use for transparent PU coatings, says Ruhl.
Its new generation puroclear coating system is now ready to start production.
By adjusting the chemical configuration "we finally succeeded in providing a transparent PU coating system which incorporates self-releasing properties as well as a better scratch resistance due to even self-healing properties, without any drawback in terms of other properties," said Dr Thomas Mack, development manager at Ruhl Puromer.
"It is astonishing how fast scratches which we have made on the surface with common everyday objects as rings and car keys disappear again. However, not less important for production and productivity is also the self-releasing variant of puroclears which will provide a further significant step for this technology in terms of efficiency and hereby acceptance," added Jürgen Emig, Ruhl's technical lab manager.