SUSTAINABLE INKJET PRINTING: PRINT PERFORMANCE ANALYSIS OF ECO-FRIENDLY INKS ON PLASTIC SUBSTRATES

Abstract

Uv-curable piezoelectric inkjet technology has revolutionized wide-format printing by minimizing volatile compound emissions (VOC) released issues and high-fidelity output on non-absorbent polymeric substrates. The Greenguard Gold accreditation has emerged as the accepted standard for eco-friendly ink systems in the retail graphics, flexible packaging and indoor-outdoor advertising industries. The US EPA’s NESHAP compliance and the needs of circular sustainable economy are causing the industry’s rapid shift from polyvinylchloride film to easily recyclable polyester film substrates, necessitating the stringent measurable characterization of print performance difference under certified output constraints. No prior research has presented contemporaneous comparative Solid Ink Density (SID) and Tone Value Increase (TVI)/ Dot Gain data for Greenguard Gold certified UV-curable inks on both substrates under identical piezoelectric inkjet conditions across a rigorous specimen population. Under ISO-recommended measurement and process parameters, this study measures and compares SID and TVI (at 40% & 80% nominal tone) across all CMYK channels for n=50 specimen per substrates. Print samples was printed on a Mimaki UJV 100-160 Plus piezoelectric (dod) system at 1200 × 1200 dpi using Mimaki LUS-210 UV-ECO Series Greenguard Gold-Certified CMYK inks. An X-Rite eXact spectrophotometer was used to measure SID in accordance with ISO 5-3/ISO13655 (M0);TVI was quantify using the Murray-Davis equation in accordance with ISO 12647-1. PVCF & PF achieve across all CMYK channels for SID (C:1.34,M:1.35,Y:1.30,K:1.43 vs C:1.04,M:1.14,Y:1.12,K:1.25), with a mean inter-substrate difference of 0.24 D. According to TVI analysis Yellow was the highest dot gain channel on both substrates at 40% nominal tone (PVCF:31.20%; PF:26.87%) and Cyan was substantially greater on PF (16.34%) compared to PVCF (11.61%). Standard deviation values of (0.02-0.90) validated process overall reliability. These outcomes prove that substrate-specific ICC profile calibration and tone curve compensation are essential prerequisites for achieving chromatic and tonal parity with PVCF under identical conditions and also establish a statistically supported  ISO-validated framework for substrate selection in UV inkjet production environments. This study contributes to five Sustainable Development Goals of the United Nations. Utilizing a low-voc Greenguard Gold-certified inks advance SDG 3 (Good Health and Well-Being ,Target 3.9) by removing toxic air pollutants (toluene, xylene and ethyl acetate) that are categorized under US EPA NESHAP. SDG 7 (Affordable and Clean Energy, Target 7.3) is supported by UV-LED curing, which uses 50-70% less energy than traditional mercury-arc systems. SDG 9 (Industry, Innovation and Infrastructure , Target 9.4) is in line with the use of ISO-validated piezoelectric DOD inkjet as a clean industrial process. SDG 12 (Responsible Consumption and Production, Targets 12.4 & 12.6) is addressed by comparing eco-preferred PET to PVC by lowering Industrial VOC and CO2 emissions throughout the printing Industry, these actions together meet SDG 13 (Climate Action, Target 13.2).