世界各国都十分重视废纸回收利用,尤其在一些工业发达国家,例如美国,采用法律的形式严格限定了纸张中二次纤维的含量,在有的州(如加利福尼亚州),不但要求二次纤维的含量很高,而且还扩大到新闻纸以外的其他纸种中。最近在伦敦举行的“新闻纸的生产、应用及其未来”研讨会上,对于目前世界上许 Countries all over the world attach great importance to the recycling of waste paper, especially in some industrialized countries, such as the United States, which adopts legal forms to strictly limit the content of secondary fibers in paper. In some states (such as California), not only secondary fibers are required. The content is high, but it also extends to other types of paper than newsprint. At the recent seminar on the production, application and future of newsprint held in London,