What is the brightness of paper?
Abstract:
本文阐述了纸张的亮度，这是一种光学特性，用于测量主波长为457 nm的蓝光的反射率。亮度值反映了纸浆的漂白质量，较高的亮度通常意味着纸张去除了木质素，从而呈现出更亮的外观。由于木质素在457 nm波长处吸光强烈，因此该波长下的测量尤为重要。亮度测试通常遵循 TAPPI T452、ISO 2469 & 2470 和 ASTM 标准，亮度较高的纸张通常更具吸引力。
Brightness is an optical property of paper that measures the reflectance/reflectance of blue light with a dominant wavelength of 457 nm. The brightness value of this wavelength is taken to indicate the bleaching quality of the pulp. The pulp is bleached to remove residual "lignin" (the glue that holds the cellulose fibers together) which, if present, gives the paper a cream/yellow appearance. Since lignin absorbs strongly at 457 nm, brightness is measured at this wavelength. Commonly followed testing standards are TAPPI T452, ISO (2469 & 2470) and ASTM methods. This characteristic is an important seller of paper, as lighter papers look more attractive than less bright papers.
Relevant knowledge
- 1How to test the physical performance of paper?
- 2Application of Glossmeter in paper surface gloss detection
- 3Application of Glossmeter in paper surface gloss detection
- 4What performance requirements should printing paper meet?
- 5What is the smoothness of paper?
- 6What is the folding resistance of paper and cardboard?
- 7What is the uniformity of paper? How to measure?
- 8How to measure the dimensional stability of paper?
- 9What are the components of paper and what are their properties?