|Filter manufacturing technology, "oxidisation".There are currently three methods of lighting filter production: coating, deep-dying and body-colouring. Rosco Supergel is body-coloured. Rosco Cinegel is deep-dyed and Rosco E-Colour+, Lee Filters and other European brands are surface coated. The technology of applying transparent dye on to a polyester film base is the same for all coaters.|
The coating process utilizes solvents, which are released into the air. When The Environmental Protection Act became UK law in 1990, all filter film coaters were required to reduce these emissions. Some opted to incinerate solvent vapors using incinerators (Oxidation unit) which need to be maintained at 700 degrees C for 24 hours per day, thus consuming significant amounts of energy and in turn releasing "greenhouse gasses".
Rosco rejected the Oxidation process since the carbon dioxide released is considered polluting by many experts. Instead, the decision was to significantly reduce the level of solvents in the coating as we felt this was the most environmentally sound route. We have significantly reduced the solvent requirement in our E-Colour+ manufacturing process and, taking this program even further, we are just about to launch a complete range of solvent-free diffusion filters based on 100% water coatings. This new range is currently undergoing field tests.
The "Oxidisation" process is purely a manufacturing process related issue and has no direct impact on the quality of the filter film.
For further information please contact;
Kangley Bridge Road
SE26 5 AQ
Ph: +44 (0)20 8659 2300
Fax: +44 (0)20 8659 3153