The process of cryo-recycling of plastic wastes has recently been developed by Harry Rosin, director of the Hygiene Institute in Dort- round, Germany. The method uses freezing rather than burning techniques for treating mixed plastic wastes. Wastes are frozen at temperatures as low as -160C so that they become highly brittle and easy to crush. As the individual components expand at different temperatures, they can be effectively separated. While still frozen, the plastics can be pulverised and separated according to polymer types as well as colour. The method is capable of dealing with old tyres and electronic scrap (Vatis Update, Vol 5, No 12).
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