The KIMW institute is working on in-line methods of applying the surface effect to plastics

The KIMW institute is working on in-line methods of applying the surface effect to plastics

A German institute is to develop in-line methods of applying “lotus effect” surfaces to plastics. The lotus effect gives plastics self-cleaning properties, but current treatments – such as Degussa’s patented process – are applied after processing using pressing or coating methods.

Preliminary investigations by the KIMW institute in Lьdenscheid have shown that spraying a tool with a nano-surfacing material will produce the effect during extrusion and blow moulding without the need for post-treatment. As an added benefit, the plastic material is easier to release from the tool.

KIMW will start a two-year research project in March to develop the process. It will involve 15 participating companies each paying project costs of E6,500. The institute sees potential for the technology in thermoforming, extrusion, coextrusion, rotational moulding, injection blow moulding, foam technology, reaction injection moulding, sheet moulding compound and glass-mat reinforced thermoplastics.

KIMW said not all polymers were suited to the technology. The best ones are those that are formed close to their melt temperatures and that are hydrophilic or polar. Low melt viscosity, high tool temperature and long process times also favour the application of the lotus effect material.