CY/T 104.4-2014 "Printing technology, paper and paperboard printing suitability test method, Part 4: printing uniformity" specifies the test principle, instrument material, sample preparation, test procedure and result representation of paper and paperboard printing uniformity. It is suitable for evaluating the uniform distribution of ink marks on paper and Cardboard during the printing process, which is of great significance to ensure printing quality and visual effect. The standard is centralized by the National Technical Committee for Printing Standardization and issued by the State Administration of Press, Publication, Radio, Film and Television to provide standardized test methods for the printing industry.