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The polymer separated from the glass as a clear plastic sheet, which Röhm gave the trademarked name Plexiglas in 1933. [5] Both Perspex and Plexiglas were commercialized in the late 1930s. In the United States, E.I. du Pont de Nemours & Company (now DuPont Company) subsequently introduced its own product under the trademark Lucite.
Transparencies can be printed using a variety of technologies. In the 1960s and 70s the GAF OZALID "projecto-viewfoil" used a diazo process to make a clear sheet framed in cardboard and protected by a rice paper cover. [1] In the 1980's laser printers or copiers could make foil sheets using standard xerographic processes. Specialist ...
Clear plastics hold the highest value as they may be dyed after recycling, while black or strongly coloured plastic is much less valuable, because they affect the color of the downstream product. Thus, plastic is typically sorted by both polymer type and colour. Various sorting approaches and technologies have been developed. [1]
A comprehensive drum screen was added to U2's performance at The Sphere. Tris Imboden using a simple drum screen. A drum screen, sometimes referred to as a drum shield or acoustic shield, is a tool used by audio engineers to avoid the sound control problems caused when louder instruments overwhelm quieter instruments and vocals on stage.
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Clear were the first carbon offset company in the world to qualify for the UK Government's Quality Assurance Scheme for Carbon Offsetting. [2] They differentiate themselves by only offsetting using Certified Emission Reductions (CERs) which have been issued every time the United Nations prevents one tonne of Carbon dioxide equivalent being emitted through carbon projects registered with the ...