INVESTIGATION OF HALF-TONE MOTTLE IN COATED PAPERS BY VARYING GRAVURE PROCESS PARAMETERS

Journal of Engineering Science and Technology

AKSHAY V. JOSHI¹ 

[1] Department of Printing Engineering, P. V. G’s College of Engineering and Technology, 44, Vidyanagari, Parvati, Pune, 411009, India;

关键词: ANOVA;    Coated paper;    DOE;    Half-tone mottle;    Regression models;   

DOI  :  

来源: DOAJ

【 摘 要 】

Half-tone mottle is due to uneven ink transfer and ink penetration, which generates an inhomogeneous image to the human eye, thereby affecting the saleability of the product. Design of Experiments (DOE) was done with gravure process parameters such as line screen, ink viscosity, press speed, ESA (Electrostatic Assist) voltage and the air gap at varying levels to evaluate the effect of these process parameters on half-tone mottle. The Stochastic Frequency Distribution Analysis (SFDA) algorithm was used to measure surface properties of paper and half-tone mottle. The experimental data were analysed through ANOVA, main and interaction plot. The results revealed a reduction in mean halftone mottle by 90.48% and 91.25% for 50 GSM and 65 GSM C1S paper respectively. The regression models were developed and validated by conducting additional runs. The results hence obtained shall help to optimize ink transfer and identify the key process variables minimizing half-tone mottle; thereby enhancing the print quality.

【 授权许可】

Unknown