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    • 4. 发明授权
    • Tennis ball
    • 网球
    • US5308060A
    • 1994-05-03
    • US892325
    • 1992-06-02
    • Masao NakamuraIchiro Tominaga
    • Masao NakamuraIchiro Tominaga
    • A63B39/06A63B39/00
    • A63B39/06Y10T442/56
    • A tennis ball having a felt covering which has superior abrasion resistance, felt appearance and resistance to fuzzing which may occur during the use of ball, the felt covering being made of a polyethylene terephthalate fiber including a polyethylene terephthalate (PET) polymer containing at least 90 mole % of recurring ethylene terephthalate units which satisfies the following parameters:(a) a value of hot air shrinkability/intrinsic viscosity of polymer falling within the range of 5.0 to 7.5%,(b) birefringence of 170.times.10.sup.-3 to 185.times.10.sup.-3,(c) Orientation factor for crystallites fc=0.935 to 0.950, and(d) amorphous molecular orientation parameter of 0.75 to 0.90.
    • 一种具有毛毡覆盖物的网球,其具有优异的耐磨性,毛毡外观和在使用球时可能发生的抗绒毛性,该毡覆盖物由聚对苯二甲酸乙二醇酯纤维制成,该聚对苯二甲酸乙二醇酯纤维包含至少90 满足以下参数的重复对苯二甲酸乙二醇酯单元的摩尔%:(a)聚合物的热空气收缩性/特性粘度值在5.0〜7.5%的范围内,(b)170×10 -3〜185×10 -3的双折射率, (c)微晶的取向因子fc = 0.935〜0.950,(d)无定形分子取向参数为0.75〜0.90。