Archive for August, 2010

History of polystyrene foam: polystyrene was ZUF? Llig discovered in 1839 by Eduard Simon, an apothecary in Berlin, Germany. From Storax, the resin of Liquidambar orientalis, he distilled a? Lige substance, a monomer that he called styrene. A few days sp? Ter Simon found that the styrene had thickened, presumably by oxidation in a jelly he called styrene oxide (“Styroloxyd”). 1845 English chemist John Blyth and German chemist August Wilhelm von Hofmann showed that the conversion of styrene was the same in the absence of oxygen. They called their substance metastyrol. The analysis showed sp? Ter that it was chemically identical Styroloxyd. In 1866 Marcelin Berthelot correctly identified the formation of styrene metastyrol as polymerization. About 80 years passed before it, the adults begin? Rmung of styrene a chain reaction that macromolecules? Le realized generated, following the thesis of the German chemist Hermann Staudinger (1881-1965). This f? Hrte closing? Get kinder to the substance, its present name, hazardous polystyrene? Leads. The IG Farben company began manufacturing polystyrene in Ludwigshafen, Germany, about 1931, in the hope it w? A suitable replacement rde f? R die-cast zinc in many applications. The success was achieved when a Reaktordruckbeh? Lter that extruded polystyrene through a heated tube and cutter, producing polystyrene developed in the form of pellets. Properties of polystyrene: Pure solid polystyrene is a colorless, hard plastic with limited flexibility? T. It can be poured into molds with fine detail. Polystyrene can be transparent or can be made? Bernahme different colors. It is more economical and is used to manufacture plastic model-building? Tze, plastic cutlery, CD “jewel” F cases?, And many other objects where a fairly rigid, economical Kunststoffabf? Lle from all different colors weight? Be nscht. Polystyrene is h? Asked use, however, such as expanded polystyrene (EPS). Expanded polystyrene is produced from a mixture of approximately 90-95% 50-10% polystyrene and gaseous? Shaped propellant, at h? Asked pentane or carbon dioxide. Through the use of Warmth, usually stem cells expanded in rigid plastic foam. Expanded polystyrene used to contain CFCs, but others are using more environmentally friendly blowing agent now. Because it is an aromatic hydrocarbon, it burns with an orange-yellow flame when Ru?. Used f? R Polystyrene: Polystyrene, shaped and cut with hot wire foam Fr? Water is used in the architecture models, tats? Chlich signage, enjoyment to? Gungsparks, film sets, aircraft, space and much more. Such Fr? Water can f only a few dollars (? R a completely manual cutter costs) to tens of thousands of dollars f? R big e CNC machines, which can be used in high-volume industrial production. Cutting EPS foam: polystyrene is very easy to cut with a hey? S wire Foam Cutter, the length slightly by a heated and taut L? Of the wire, generally, is produced. The hot wire foam cutter e works by heating the wire to the point where it can evaporate foam immediately next to it. The foam is before the actual TV Show Channel of the heated wire, the au? Ergew? Similar smooth cuts is evaporated. Polystyrene can also be cut with a traditional knife. To ruin this without the sides of the blade has to first dip the blade in water and cut with the blade at an angle of about 30? Doing the procedure was repeated several times, his order to achieve optimal results. Polystyrene can also be cut to 3 and 5-axis CNC router, so that large? scale prototyping and model making. Special polystyrene Fr? These are avail? Gbar that look like big e cylindrical rasps