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| Study on Back Trap Mottle of Paper Printing |
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| DOI：10.11980/j.issn.0254-508X.2011.04.003 |
| Key Words:colored offset newsprint art paper, single coated paper back trap mottle subjective evaluation objective quantitative assessment |
| Author Name | Affiliation | | 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 | | 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 | 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 | | 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 | | 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 | | 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:The back trap mottle in the print of different kinds of paper such as color offset newsprint, art paper and single coated paper was evaluated in this paper. Results showed that the optimized conditions of two kinds of newsprint are as follows: ink amount 0.10 mL, printing pressure 650 N, printing speed 0.4 m/s; there exists inconsistent correlation between objective quantitative assessment of mottling and subjective evaluation. Less mottle is obtained with the least ink amount by means of objective quantitative assessment, however, less mottle results are obtained with the medium ink amount when using subjective evaluation. The optimized conditions of the two kinds of single coated paper are as follows: ink amount 0.35 mL, printing pressure 200 N, printing speed 0.3 m/s. The optimized conditions of art paper are different. Results showed that there exists consistent correlation between 2 groups and 4 groups subjective evaluation of mottling. Among the three objective analysis methods, spectrum analysis correlates most closely with the visual results, then the PTS method. And the grey value method correlates at the least. So the spectrum analysis and the PTS method are expected to be the new methods for evaluation of the back trap mottle. |
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