Papers by Author: Jiang Hao Liu

Abstract: Ink is one of the most important raw materials in printing processes, the quality of printed product uniformity and color reproduction, usually to some extent, depends on ink performance, which needs the authoritative and reliable way to measure ink colors. The paper is to test and verify the ink color measurement methods based on ISO 2846 international standards by the experiments, and the performance indicators of domestic standards substrates are determined through analyzing the characteristics of the domestic printing and ink manufacturing industries, and then the preparation of ink color measurement samples and ink color test conditions are studied.

Abstract: The practical applied formula are based on the density measurement in ink trapping characterization methods, but the density measurement is more suitable for detecting single color printing effect. Due to the defects of the testing equipment, the density measurement is not suitable for the evaluation of ink trapping. Chromaticity evaluation method bases on the color difference between the sample color values and the ideal color values to evaluate ink trapping effects, which can characterize better on the ink trapping effects. Research results showed that the density evaluation method has many deficiencies, and Neugebauer equations predict on the chroma evaluation method doesn’t reach an enough precise to get the ideal value about the secondary overprinting, while the color value which is measured by spectroscopic measurement by experimental methods can be used as the ideal color value of the chromaticity evaluation method. Study on the comparison between density evaluation method and chroma evaluation method of ink trapping, the relative conclusions about advantages and disadvantages of different ink trapping characterization methods will be summarized.

Abstract: To improve scratch-resistance and abrasion-resistance of water-based varnish, change the type of water-based resin, the type and content of wax emulsion and flow agent, then test scratch-resistance and abrasion-resistance of water-based varnish. The results show that resin and wax emulsion has a great influence on the scratch-resistance and abrasion-resistance of water-based varnish. Adding appropriate amount of wax emulsion can improve scratch-resistance and abrasion-resistance to some extent. Adding flow agent has certain influence on scratch-resistance of water-based varnish.