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Studies on Print Mottle of Printing Paper
  
DOI：10.11980/j.issn.0254-508X.2011.05.008
Key Words:color offset newsprint  art paper  single coated paper  print mottle  subjective evaluation  objective quantitative assessment
Fund Project:本课题为国家质检总局立项科研项目(2007QK298)。
Author NameAffiliation
欧海龙1 1.广东省东莞市质量监督检测中心国家纸制品质量监督检验中心,广东东莞,523808 
陈春霞1 1.广东省东莞市质量监督检测中心国家纸制品质量监督检验中心,广东东莞,523808 
黎伟波1 1.广东省东莞市质量监督检测中心国家纸制品质量监督检验中心,广东东莞,523808 
徐梅英1 1.广东省东莞市质量监督检测中心国家纸制品质量监督检验中心,广东东莞,523808 
邓健信1 1.广东省东莞市质量监督检测中心国家纸制品质量监督检验中心,广东东莞,523808 
王玉峰1，2 1.广东省东莞市质量监督检测中心国家纸制品质量监督检验中心,广东东莞,523808；2.华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 
陈健鸿1 1.广东省东莞市质量监督检测中心国家纸制品质量监督检验中心,广东东莞,523808 
邱玉桂1，2 1.广东省东莞市质量监督检测中心国家纸制品质量监督检验中心,广东东莞,523808；2.华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 
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Abstract:This paper evaluates the print mottle in the prints of different kinds of paper such as color offset newsprint, art paper and single coated paper. Results showed that the optimized conditions for the two kinds of newsprint A & B are different except for the ink amount of 0.1 mL. The optimized conditions of the single coated paper F and art paper E are as follows: ink amount 0.2 mL, printing pressure 325 N, printing speed 0.4 m/s. There exists inconsistent correlation between objective quantitative assessment of mottling and subjective evaluation for F, however there is good correlation for E. The optimized conditions of the single coated paper H are as follows: ink amount 0.05 mL, printing pressure 525 N, printing speed 0.3 m/s. Results show that there exists consistent correlation between 2 groups and 4 groups subjective evaluation of mottling. Among the three digital analysis methods, power spectrum analysis correlates the most closely with the visual results, then the PTS method. And the grey value method correlates the least. So the power spectrum analysis and the PTS method are expected to be a new method for evaluation of the print mottle.
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