Photo-chemical foaming raises patterns on sheet.An unusual process uses uv radiation to cause microcellular foaming in narrow bands on the surface of thin t-butylacrylate/methylmethacrylate copolymer sheet. The process was reported by Oji Paper Co. of Tokyo in a paper at the Foams TopCon 2006 conference in Elk Grove Village Elk Grove Village, village (1990 pop. 33,429), Cook and Du Page counties, NE Ill., a suburb of Chicago; inc. 1956. With a population of c.100 at the time of its establishment on open farmland, the village has grown dramatically and steadily, largely because of its , Ill., last month, sponsored by the Society of Plastics Engineers. Because the high-resolution foamed patterns selectively change the transparency of the film, Oji Paper is exploring the process for making optical diffusion films, light guides, and optical wave guides. To make the film, acrylic copolymer containing a photosensitive A material that changes when exposed to light. See photoelectric. acid generator is solvent cast onto a supporting PET sheet, then peeled off and treated in two separate steps. The sheet is first uv-irradiated and then heated. The combination induces chemical reactions that release isobutene gas, forming cells smaller than 10 microns. Cell size is controlled by temperature. This photochemistry photochemistry, study of chemical processes that are accompanied by or catalyzed by the emission or absorption of visible light or ultraviolet radiation. A molecule in its ground (unexcited) state can absorb a quantum of light energy, or photon, and go to a reportedly foams much thinner film than is possible by extrusion with supercritical Adj. 1. supercritical - (especially of fissionable material) able to sustain a chain reaction in such a manner that the rate of reaction increases critical - at or of a point at which a property or phenomenon suffers an abrupt change especially having enough mass CO2, which tends to lose gas from the film surface. Patterns can be photochemically foamed into sheet by masking the uv light or drawing lines with a uv laser. Oji Paper: +81 (3) 3533-7008/www.ojipaper.co.jp * SPE SPE - Software Practice and Experience : (203) 775-0471/www.4spe.org [ILLUSTRATION OMITTED] |
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