Krauss Maffei of Munich Germany, a world leader in plastics machinery is represented in Oceania by HBM Packaging & Plastics Technologies .
Krauss Maffei has partnered with Evonik Rohm GmbH to develop the CoverForm process for ‘one-shot’ injection moulded production of components with scratchproof coatings.
In the CoverForm process, a PMMA (acrylic) component is injection moulded and a functional protective layer applied in the mould immediately afterwards. A compression moulding sequence spreads the coating evenly over the PMMA surface. This eliminates the need for up to 14 steps normally taken by a conventional value-adding chain in the production of coated parts.
Precise control of the electric injection unit combined with the special compression clamp sequence ensures absolute repeatable micron thickness of the scratchproof coatings.
The process uses a special PLEXIGLAS of thermoplastic moulding compound for the substrate and a solvent-free, acrylate-based two-component reactive system for the scratchproof coatings.
Krauss Maffei will be displaying this technology at the K 2010 Plastics show in Düsseldorf Germany in October with a CX 200-750 hybrid injection machine on display that incorporates the latest compression moulding technology and a metering unit for the reactive system, which has been optimised for the CoverForm process.
The mould heating system has been developed to operate with multiple cavity moulds and features an integrated robot for parts removal and handling, EcoPac insulating sleeves as well as a BluePower servo drive pump.
Parts manufactured with CoverForm scratchproof coatings have outstanding characteristics such as high resistance to scratching as well as chemicals and are particularly popular in the production of automotive parts, medical devices, household appliances and mobile phones.
Manufacturers using the CoverForm process can derive benefits such as reduced cycle times and high production quality of components.