前言CY／2－91《书刊印刷产品质量评价和分级方法》标准是1991年发布实施的行业标准。根据《中华人民共和国标准化法》和国家质量技术监督局的要求，经新闻出版署批准，对其进行了修订。本标准对原标准主要有以下几点修订。①本次修订以GB／T12707《工业产品质量分等导则》为指 Foreword The CY/2-91 Standard for Quality Evaluation and Grading of Printed Book Products is an industry standard that was issued in 1991. According to the “Standardization Law of the People’s Republic of China” and the requirements of the National Bureau of Quality and Technical Supervision, it was revised by the press and publication authority. This standard mainly includes the following amendments to the original standard. 1 This revision refers to GB/T12707 “Guidelines for the Quality Classification of Industrial Products”