Novel Process Makes Cascade Of Clear Optical Film.A new low-stress extrusion process for making film and sheet of very high optical quality is believed to be the first to use a free surface to form plastic film. The sheet is formed by flowing resin resin, any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing out of a long slot that runs along the top of the die. Resin then flows down two sides of the die and meets at the bottom, forming a low-stress film of molten plastic. The molten film is clamped and supported on both edges as it cools. Because the sheet of plastic isn't formed between metal surfaces, the polymer chains aren't oriented o·ri·ent n. 1. Orient The countries of Asia, especially of eastern Asia. 2. a. The luster characteristic of a pearl of high quality. b. A pearl having exceptional luster. 3. and the surface is very smooth. The patented SFO SFO (in Britain) Serious Fraud Office (Stress-Free Optical) process (U.S. Patent No. 6,183,829 B1 issued Feb. 6, 2001) is similar to that used to make optical glass. It is available for licensing from Rohm & Haas Co., Philadelphia. It targets plastic films and rigid substrates for LCDs, electroluminescent displays Electroluminescence (EL) is an optical and electrical phenomenon where a material emits light in response to an electric current passed through it, or to a strong electric field. Electroluminescent Displays (ELD , optical windows and films, data-storage media, and other applications. Rohm & Haas has used the process to make developmental acrylic acrylic, artificial fiber made from a special group of vinyl compounds, primarily acrylonitrile. Acrylic fibers are thermoplastic (i.e., soften when heated, reharden upon cooling), have low moisture regain, are low in density, and can be made into bulky fabrics. and PC films up to 20 in. wide and 1 mm thick. |
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