Worldwide patented process
SCHOTT HiCotec´s underlying coating process is the Plasma Impulse Chemical Vapor Deposition (PICVD) technology, which has been patented worldwide. It was developed by SCHOTT 20 years ago and has been successfully applied to the coating of mass-produced glass components such as cold light reflectors, energy-saving light bulbs and pharmaceutical vials. The new SCHOTT HiCotec division was established to expand the technology into the coating of plastics important in the packaging, optics, telecommunications and automotive industries. In recent months the company has been successful in adapting the original PICVD process to apply glass-like oxide layers of silicon dioxide or titanium dioxide to a number of important plastics – PET, PMMA, PC, PP, HDPE and PLA. A key requirement in the coating of all of these materials, to minimize damage to the surface, is the need to keep the coating temperature as low as possible. This is achieved by the feature of the PICVD process that distinguishes it from other plasma processes – the pulsing of the plasma.
Applying an anti-scratch and anti-reflection coating
In a single process using the PICVD technology, it is possible to apply a multilayer coating to plastic display covers and lenses that make the plastic surfaces scratch resistant. In addition, the anti-reflection coating makes the displays used in mobile phones, measuring instruments or navigation systems easier to read.
Coatings can be designed and developed to meet the customer’s requirements. A typical multilayer system applied to a display window consists of an adhesion layer – essential in ensuring that the coating does not detach from the display during testing and in use, an anti-scratch layer and the anti-reflection layer. The anti-scratch layer consists solely of silicon dioxide, a pure form of glass and very hard. The anti-reflection layer consists of alternate layers of silicon dioxide and titanium dioxide, the number of layers depending on the application. With this coating, reflection is typically reduced to less than one percent.
Plastic containers with a gas barrier and chemical resistance