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Tire recycling or rubber recycling is the process of recycling vehicles' tires (British English tyres) that are no longer suitable for use on vehicles due to wear or irreparable damage (such as punctures). These tires are among the largest and most problematic sources of waste, due to the large volume produced, their durability, and the fact they contain a number of components that are ecologically problematic. It is estimated that 259 million tires are discarded annually (data is for the 1980s and 1990s). The same characteristics that make waste tires problematic, their cheap availability, bulk, and resilience, also make them attractive targets for recycling. Nonetheless more than half of used tires are simply burned for their fuel value. Even in advanced countries like Germany, 55% are estimated to be burnt for fuel.〔Desmond Threadingham, Werner Obrecht, Wolfgang Wieder, Gerhard Wachholz and Rüdiger Engehausen "Rubber, 3. Synthetic Rubbers, Introduction and Overview" in Ullmann's Encyclopedia of Industrial Chemistry, 2011, Weinheim. 〕 Approximately, one tire is discarded per person per year. Tires are also often recycled for use on basketball courts and new shoe products. However, material recovered from waste tires, known as "crumb," is generally only a cheap "filler" material and is rarely used in high volumes. They are made to be highly durable and weatherproof, which causes mass landfill space to be used up, as tires are non-biodegradable. == Tire life cycle == The tire life cycle can be identified by the following six steps: #Product developments and innovations such as improved compounds and camber tire shaping increase tire life, increments of replacement, consumer safety, and reduce tire waste. #Proper manufacturing and quality of delivery reduces waste at production. # Direct distribution through retailers, reduces inventory time and ensures that the life span and the safety of the products are explained to customers. # Consumers' use and maintenance choices like tire rotation affect tire wear and safety of operation. # Manufacturers and retailers set policies on return, retread, and replacement to reduce the waste generated from tires and assume responsibility for taking the 'tire to its grave' or to its reincarnation. #Recycling tires by developing strategies that combust or process waste into new products, creates viable businesses, and fulfilling public policies.〔Price, Willard, and Edgar D. Smith. (2006). Waste tire recycling: environmental benefits and commercial challenges. International Journal of Environmental Technology and Management 6.3-4, 363-364〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「tire recycling」の詳細全文を読む スポンサード リンク
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