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亮度/白度是纸张一项重要的外观性能和光学性能,二者是两个不同的概念,在测定原理上有着根本的区别。目前纸张亮度/白度测试的主要依据是国家标准、ISO标准和TAPPI标准,不同标准体系所采用的测试方法不同,特别是在光源、几何条件等方面有很大差别,因此采用不同标准体系所测得的结果也存在很大差别。本文阐述不同标准体系下纸张亮度/白度的规范化测量条件,对不同标准体系下纸张亮度/白度的测试方法、测试结果进行对比,并对纸张亮度和白度的关系进行分析。
Brightness / whiteness is an important visual and optical property of paper, both of which are two different concepts that are fundamentally different in principle. At present, the main basis of the paper brightness / whiteness test is the national standard, the ISO standard and the TAPPI standard. Different standard systems adopt different test methods, especially in terms of light source, geometric conditions and the like. Therefore, different standard systems The measured results are also very different. This paper describes the normalized measurement conditions of paper brightness / whiteness under different standard systems, compares the test methods and test results of paper brightness / whiteness under different standard systems, and analyzes the relationship between paper brightness and whiteness.