Success in exceptional methods
A PVD coating protects electronic components and shields them from electromagnetic radiation. Wohlrab coats metals using a sputtering process performed in its own specially developed systems. In contrast to conventional evaporation, this type of coating can be applied in a fully reproducible manner.
"While evaporation involves pure metal being evaporated using heat and being condensed onto the pre-treated plastic components, sputtering bombards solid metal sheets (known as targets) with ions, which causes high-energy particles to be released," explains Christian Wohlrab, managing director of Wohlrab GmbH.
"These particles concentrate in front of the target in the form of a cloud, through which the parts to be coated can then be moved. The coatings created in this way not only adhere considerably better to the pre-treated parts, but the process can also be used to apply metal alloys." The company also specialises in ITO coating – a conductive coating which, unlike metal layers, is transparent.
Collaboration to bring mutual success
The benefits of the partnership are particularly clear in the field of hearing aids, as here the processes offered by the two companies are being expanded by each other's portfolio. Toolcraft can now finish high-tech plastic components for use in the medical industry to a high quality – by means of either a decorative finish or by a nanocoating which makes them resistant to environmental factors.
In return, Wohlrab can from now on draw on toolcraft's expertise in the plastic injection moulding of extremely small parts. The partnership is bringing a host of benefits in other areas as well.