The influence of pigment proportions and calendering of coated paperboards on dot gain
-
Published:2019
Issue:2
Volume:51
Page:212-218
-
ISSN:0324-1130
-
Container-title:Bulgarian Chemical Communications
-
language:en
-
Short-container-title:BCC
Affiliation:
1. Marmara University, School of Applied Sciences, Department of Printing Technologies, Goztepe-34722, Istanbul, Turkey 2. Istanbul University-Cerrahpaşa, Faculty of Forest, Department of Forest Product Chemistry and Technology, Bahcekoy-34473, Istanbul, Turkey
Abstract
Dot gain is called Tone Value Increase (TVI). Low dot gain and rounder dot shape are important properties to obtain a good print. Dot gain is a measure of how much extra weight a given percent dot or tone has gained on the final printed substrate by comparison to the actual dot area on a press plate. Dot gain value depends on many factors. The interactions of paper, ink and press conditions are important determinates for a good print. In addition, the pigment coating process and calendering conditions have a significant effect on the printability of paperboards. Pigment coating formulations including mineral pigments, binders and additives improve the gloss, brightness, opacity and smoothness of the paperboards. As a result, print quality of paperboards increase. A uniform paperboard surface is needed to obtain a high quality surface smoothness after the coating process. High surface smoothness improves the uniformity of the dot shape and size. Pigment coating formulation parameters; pigment selection, binder selection and binder level influence print quality. The aims of this study - pigment selection and ratio - are to determine the effect on dot gain in lithography printing. To this aim, base paperboards were coated using five pigment coating formulations which included different combinations of kaolin, calcium carbonate and titanium dioxide pigment with a styrene\n-butyl acrylate copolymer binder using a bar application. After coating, the samples were air-dried overnight under TAPPI conditions. Then, half of the coated-paperboards were calendered. Tone scales from 1 to 100 % were offset printed using black ink on the uncalendered and calenderedcoated paperboards. Then, from the printed tone scale, the tone area values were measured with the Gretagmacbeth Spectrolino spectrophotometer. These values showed that pigment coating improved the surface optical and physical properties of paperboards. After calendering, the roughness values of coated paperboards decreased. In addition, the obtained dot and line sharpness on calendered-coated paperboards were better than on uncalenderedcoated paperboards. However, the dot gain values of calendered-coated paperboards had fewer dot gains than uncalendered-coated paperboards. It was established that the variation of pigment proportions in the coating formulations had no significant effect on dot gain.
Publisher
Institute of Chemical Engineering, Bulgarian Academy of Sciences
Subject
General Chemistry
Reference17 articles.
1. Y. C. Hsieh, Factors Affecting Dot Gain On Sheet-Fed Offset Presses, Journal of Visual Communications, University of Houston, Houston, TX, 39 (1997). 2. H. N. Dharavath, T. M. Bensen, B. Gaddam, Analysis of Print Attributes of Amplitude Modulated (AM) vs. Frequency Modulated (FM) Screening of Multicolor Offset Printing, Journal of Industrial Technology, 21(3), 2 (2005). 3. A. Verikas, J. Lundström, M. Bacauskiene, A. Gelzinis, Advances in Computational Intelligencebased Print Quality Assessment and Control in Offset Colour Printing, Expert Systems with Applications, 38, 13441 (2011). 4. D. Kumpar, I. Zjakic, I. Bates, Deviation of Deformation of the Screen Elements Through Circulation in the Newspaper Printing, Chapter 34, in: DAAAM International Scientific Book 2010, B. Katalinic (ed.), DAAAM International, Vienna, 2010, p. 357. 5. R. S. M. Abouzeid, A Toner technology & Image Quality in Electrophotography Printing, The International Design Journal, 3 (2), 1 (2013).
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|