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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;
Marketing Department
Roscolab Ltd
Blanchard Works
Kangley Bridge Road
Lower Sydenham
London
SE26 5 AQ
Ph: +44 (0)20 8659 2300
Fax: +44 (0)20 8659 3153
E-mail: marketing@roscolab.co.uk
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