Copper chill roll needs no chiller.A new patented, copper chill roll for cast film reportedly cools so much more efficiently than conventional steel rolls that it provides dramatically higher output for the same roll diameter or allows a smaller roll to be used for the same output. Thermal conductivity thermal conductivity A measure of the ability of a material to transfer heat. Given two surfaces on either side of the material with a temperature difference between them, the thermal conductivity is the heat energy transferred per unit time and per unit of the copper is so high that it cools with room-temperature water at 68 F instead of chilled water at 46 to 50 F, saving both equipment and energy costs. Using substantially warmer water also eliminates condensation at the roll ends for better quality film. The copper roll was invented by Derichs Maschinen- und Apparatebau GmbH in Krefeld, Germany. Cooling water runs through flat, multi-start spirals around the roll, separated by channels that add stiffness. A seamless copper tube is shrunk shrunk v. A past tense and a past participle of shrink. shrunk Verb a past tense and past participle of shrink shrunk, shrunken shrink over the spiral-channeled inner body, and the copper is then plated with chrome (jargon) chrome - (From automotive slang via wargaming) Showy features added to attract users but contributing little or nothing to the power of a system. "The 3D icons in Motif are just chrome, but they certainly are *pretty* chrome!" or another surface coating Surface coating A substance applied to other materials to change the surface properties, such as color, gloss, resistance to wear or chemical attack, or permeability, without changing the bulk properties. . Derichs began building copper rolls in 2001. The first cast film maker to use a copper roll is Tetra Pak Tetra Pak is a multinational food processing and packaging company of Swedish origin. It was founded in 1951 in Lund, Sweden by Ruben Rausing and Erik Wallenberg. The company is part of the Tetra Laval group which also includes Sidel- who specialise in PET bottles- and DeLaval, a in Lund, Sweden. Derichs: +49 (2151) 306 950 * www.derichs-gmbh.de [ILLUSTRATION OMITTED] |
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