Step 1: Quantification The lifetime of a tennis racquet is very variable—depending on the frequency and manner of usage—, and no precise data are available. Although a period of between two and six years could be considered a reasonable lifespan for a tennis racquet, a precise number is not necessary for the present modelling. In fact, the market for tennis racquets has been pretty constant for the last decade, and the same can be assumed for the number
of racquets being thrown away (i.e. material losses during use phases can reasonably be assumed negligible). In 2006, the amount (xt - rt) of carbon fibres utilised for manufacturing tennis racquets was in the order of 1,650 Mg (Compositesworld 2008). Data about the market penetration of tennis racquets using nanotechnology are not available; however,nanotechnologies have been incorporated in tennis racquets since early 2000, and all major producers now
offer models containing nanotechnologies at prices which are close to nano-free equipment. It is, thus,reasonable to assume a market penetration (Fpen) value of at least 20 % and upto 50 %. Considering that 95 % (Gottschalk et al. 2010) to 100 % (Meyer et al. 2009; Franco et al. 2007) of the initial material will reach the EOL and be disposed of, it is estimated that 313–825 Mg year-1 of tennis racquets with CNT will end up in solid waste streams (Table 3). nanotechnologies have been incorporated in tennis racquets since early 2000, and all major producers now offer models containing nanotechnologies at prices which are close to nano-free equipment. It is, thus,reasonable to assume a market penetration (Fpen) value of at least 20 % and upto 50 %. Considering that 95 % (Gottschalk et al. 2010) to 100 % (Meyer et al. 2009; Franco et al. 2007) of the initial material will reach the EOL and be disposed of, it is estimated that 313–825 Mg year-1 of tennis racquets with CNT will end up in solid waste streams (Table 3).
Step 1: Quantification The lifetime of a tennis racquet is very variable—depending on the frequency and manner of usage—, and no precise data are available. Although a period of between two and six years could be considered a reasonable lifespan for a tennis racquet, a precise number is not necessary for the present modelling. In fact, the market for tennis racquets has been pretty constant for the last decade, and the same can be assumed for the number
of racquets being thrown away (i.e. material losses during use phases can reasonably be assumed negligible). In 2006, the amount (xt - rt) of carbon fibres utilised for manufacturing tennis racquets was in the order of 1,650 Mg (Compositesworld 2008). Data about the market penetration of tennis racquets using nanotechnology are not available; however,nanotechnologies have been incorporated in tennis racquets since early 2000, and all major producers now
offer models containing nanotechnologies at prices which are close to nano-free equipment. It is, thus,reasonable to assume a market penetration (Fpen) value of at least 20 % and upto 50 %. Considering that 95 % (Gottschalk et al. 2010) to 100 % (Meyer et al. 2009; Franco et al. 2007) of the initial material will reach the EOL and be disposed of, it is estimated that 313–825 Mg year-1 of tennis racquets with CNT will end up in solid waste streams (Table 3). nanotechnologies have been incorporated in tennis racquets since early 2000, and all major producers now offer models containing nanotechnologies at prices which are close to nano-free equipment. It is, thus,reasonable to assume a market penetration (Fpen) value of at least 20 % and upto 50 %. Considering that 95 % (Gottschalk et al. 2010) to 100 % (Meyer et al. 2009; Franco et al. 2007) of the initial material will reach the EOL and be disposed of, it is estimated that 313–825 Mg year-1 of tennis racquets with CNT will end up in solid waste streams (Table 3).
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