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3、定子曲面拉毛;抛光或修磨。让废料成为下一道生产程序的原料,这种循环可大大资源利用率,经济发展带来的环保压力,因此多一个这样的“循环圈"就是为当地GDP添一分“绿"。譬如,用新木浆造1吨新闻纸,需要耗费3立方米木材,相当于砍伐6棵生长20年的大树,还要配上200吨水、600度电、1吨煤、约1吨烧碱和其他化学剂。而上海旧报纸回收率很高,达到了80%,用旧报纸再造1吨新闻纸,所耗用的水、电、煤分别比用木浆造纸80%、50%、60%,且无需砍树也基本不用烧碱。在大量节约资源的同时,废纸造纸的污染总负荷也下降到木材造纸的8%以下。
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