Krauss-Maffei, represented in Oceania by HBM Packaging & Plastics Technologies , offer the new protective coating technology for injection moulded clear parts for commercial applications. Developed in collaboration with Evonik of Germany, the in-mould coating system reduces the cost of applying a protective scratch proof layer to plastic parts such as lighting, lenses or display panels.
The protective coating technology was unveiled at the K trade show in Dusseldorf, where Krauss Maffei moulded an electroluminescent PMMA (acrylic) -based display on a KM 80-180 CX moulding machine, applying a liquid acrylic-based reaction mix for a one-step clear coat moulding for a scratchproof plastic lens.
The protective coating technology was applied in the mould under clean room conditions following injection moulding. A purpose-built, small-volume unit metered the liquid acrylic reaction system into the mould cavity.
This was followed by a compression moulding function to spread the coating evenly over the surface. The material’s low viscosity allowed long flow paths and spread a thin layer, less than 50µm, over the component. The protective coating technology then cured in two stages. It cured partially in the mould, so that parts could be demoulded without causing damage to them, and then completely cured under UV light in a post-mould process.
According to Sven Schrobel, Evonik Manager, Business Development for moulding components, his company will open a ‘customer centre’ at its German Darmstadt facility to allow customer testing of various applications of the new process.