The ISO 8254-1-2009 Measurement of polishing gloss on paper and Cardboard Part 1:75 ° gloss with converging beam of light, TAPPI method specifies a method for measuring polishing gloss on paper and Cardboard at an incident angle of 75 ° by converging beam of light method. The polishing gloss reflects the smoothness and Gloss of the paper surface, which affects its Appearance and printing quality. The standard uses the TAPPI method to specify the instruments required for measurement, sample preparation, operating procedures and environmental conditions to ensure measurement accuracy and repeatability. This method is suitable for testing high-Gloss paper and Cardboard, and is widely used in paper product production, quality control and printing industries to help improve the mass and market competitiveness of paper.