The effects of coating colours on base papers

Engin, Merve; Sönmez, Sinan; Özden, Öznur

doi:10.1108/prt-06-2021-0064

Cited by 6 publications

(6 citation statements)

References 35 publications

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“…This should be taken into account when assessing the suitability of WTT papers for printing and other applications. However, previous studies have shown that WTT papers with coated suspension, including GCC, have printability-acceptable surface strength wax numbers. − Filler materials like GCC can reduce paper surface strength, but this may not always affect print quality. Studies suggest that the optimal surface strength wax number for printability depends on the printing method, ink type, and paper properties.…”

Section: Resultsmentioning

confidence: 99%

Improving the Optical Properties and Filler Content of White Top Testliners by Using a Size Press

2023

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This study aims to investigate the impact of coating with ground calcium carbonate (GCC) on the optical properties and filler content of white top testliner (WTT) papers. The paper properties investigated include brightness, whiteness, opacity, color coordinates, and yellowness. The results showed that the amount of filler mineral used in the coating process significantly affected the optical properties of the paper. The use of 15% total solids of GCC in the coating suspension resulted in the highest level of whiteness and improved the brightness value by 6.8%. The use of 7% total solids of starch and 15% total solids of GCC reduced the yellowness index by 85%. However, the use of only 7 and 10% total solids of starch had an adverse effect on the yellowness values. The surface treatment led to a significant increase in the filler content of the papers, with a maximum of 23.8% achieved using a coating suspension with 10% total solids of starch solution, 15% total solids of GCC suspension, and 1% dispersant. The starch and GCC in the coating suspension were found to have a direct impact on the filler content of the WTT papers. The addition of a dispersant improved the uniform distribution of the filler minerals and increased the filler content of the WTT. The water resistance of WTT papers increases due to the use of GCC, while their surface strength remains at an acceptable level. The study demonstrates the potential benefits of the surface treatment in terms of cost savings and provides valuable information on the impact of the treatment on the properties of WTT papers.

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Section: Resultsmentioning

confidence: 99%

Improving the Optical Properties and Filler Content of White Top Testliners by Using a Size Press

2023

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“…Many studies have been conducted on the effect of recycling on the physical and optical properties of paper (Atik, 1999; Tze and Gardner, 2001; Vahey et al , 2006; Husovska et al , 2015; Engin et al , 2021; Hu et al , 2017). According to the results of the study, it is determined that the number of recycling decreased the opacity of the paper and increased its whiteness and yellowness.…”

Section: Discussionmentioning

confidence: 99%

Analysis of the color properties of papers subjected to different recycling numbers in electrophotographic (toner) printing

Yılmaz

2022

PRT

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Purpose In this present study, electrophotographic printing is made on papers which are subjected to different recycling numbers, and this paper aims to examine the colour changes of this printing type. Design/methodology/approach Four-colour electrophotographic printing is carried out on adhering to the INGEDE 11p standard recycled papers four times under the same conditions. Colour measurements are made by means of electrophotographic printed colour scales printed on these recycled papers. Colour measurements are made with the X-Rite eXact spectrophotometer according to the ISO 13655:2017 standard. As a result of colour measurements, colour differences (ΔL′, ΔH′, ΔC′, ΔE00) of recycled papers are determined using some formulas. Findings According to the values obtained after four recycling, the highest ΔL′ value is found to be 4.80 yellow and the lowest 1.92 black. Again, according to the measurement results, it is determined that the highest ΔE00 is yellow colour with a value of 5.66, and lowest ΔE00 is black colour with a value of 1.98. In ΔH′, black colour is the highest value of 12.61, the lowest value with −2.05 is obtained in magenta colour. It was observed that the highest ΔC′ value is 2.98 in yellow, and the lowest value is −0.28 in black. Originality/value In the printing industry, sometimes customers want to monitor the colour differences in the printing by taking the L′a′b′ obtained values as a result of printing from the printing houses. If the colour differences exceed the tolerance values, then they can interfere with the printing. As a result of the calculations, colour changes in electrophotographic printing are observed with many parameters. This study can be a pioneer for the studies that can be done on this subject.

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“…Only the proportion of PCC and GCC was chosen as a variable (25%, 50%, 75% and 100%), while the amount of the components (water, starch and CMC) in the coating colors was kept constant. It is well known that the pigment particle size and the distribution within the coating color play an important role in achieving the desired optical and physical qualities of paper (Engin et al , 2021; Murray and Kogel, 2005). The particle size of PCC and GCC should be 2–3 µm or smaller to get a suitable degree of dispersion of pigments within color.…”

Section: Methodsmentioning

confidence: 99%

Effects of precipitated and ground calcium carbonate coating on mechanical properties of fluting paper

Çiçekler

Üzüm

Çopurkuyu

2023

PRT

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Purpose The purpose of this study is to investigate the effects of a pigment coating on the mechanical properties of fluting paper. Design/methodology/approach Two different calcium carbonate pigments were used in the preparation of the coated color, precipitated calcium carbonate (PCC) and ground calcium carbonate (GCC). Fluting paper produced by recycling waste paper was used as base paper. The effects of PCC and GCC pigments on mechanical properties were compared. Ring crush test (RCT), corrugating medium test (CMT), corrugating crush test (CCT), tensile and burst strength tests were applied to the coated papers, and the results were compared to the mechanical properties of base paper. Findings The tensile and burst indices of the coated papers were found to be higher than base papers about 13.9% and 6.05%, respectively. While the coating process positively affected the RCT and CCT values, it did not show a significant impact on the CMT values. GCC, one of the pigments used in coating colors, had a more effective effect on the mechanical properties of fluting papers compared to PCC. Originality/value These results suggest that coating of fluting papers has a positive effect on mechanical properties and the use of GCC as a pigment is more effective than PCC.

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The effects of coating colours on base papers

Cited by 6 publications

References 35 publications

Improving the Optical Properties and Filler Content of White Top Testliners by Using a Size Press

Improving the Optical Properties and Filler Content of White Top Testliners by Using a Size Press

Analysis of the color properties of papers subjected to different recycling numbers in electrophotographic (toner) printing

Effects of precipitated and ground calcium carbonate coating on mechanical properties of fluting paper

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