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Author(s): |
Ying Li, State Key Lab of Pulp and Paper Engineering South China University of Technology, Guangzhou, 510640, China
Bei-hai He, State Key Lab of Pulp and Paper Engineering South China University of Technology, Guangzhou, 510640, China
Yun-lan Meng, State Key Lab of Pulp and Paper Engineering South China University of Technology, Guangzhou, 510640, China
Ying Li, State Key Lab of Pulp and Paper Engineering South China University of Technology, Guangzhou, 510640, China |
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Abstract: |
In the offset printing process, it often occurs that the coating layer can not absorb ink equably and ink on the coated paper can not dry at even speed. When coated paper moves through the next printing unit, the quantity of ink peeled off from image is not same. When the difference of ink peeled off by the blanket cylinder can be observed, the color of printing is not uniform and print mottle occurs. The physical structure and chemical properties of coating layer affect transferring and setting of the ink. Binder which is the important composition for coating layer is detrimental to surface topography and chemical properties of coated paper. In this study, the effect of binder on print quality of coated paper was investigated. Binder migration had two trends which were towards coating surface and interior of base paper. Binder can not distribute evenly on the coating surface in the process of coating solidifying and drying, which affect surface topography of coating layer and ink absorption. The main objective of this study was to investigate the effect of binder of coated paper on surface properties of coating layer and print quality. The binder migration of coating layer was obtained by changing drying temperature. The relationship between binder and print quality was explored by ink absorption uniformity.
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