Effect of Plasma Surface Modification on Print Quality of Biodegradable PLA Films
| Autor: | Joanna Izdebska-Podsiadły |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science QH301-705.5 Flexographic ink printability QC1-999 Substrate (printing) Contact angle Flexography General Materials Science Biology (General) solvent-based inks Instrumentation QD1-999 Fluid Flow and Transfer Processes print quality plasma activation Process Chemistry and Technology Plasma activation PLA films Physics Weight change General Engineering Engineering (General). Civil engineering (General) Gloss (optics) Computer Science Applications flexographic printing water-based inks Chemistry Chemical engineering visual_art biodegradable polymers visual_art.visual_art_medium Wetting TA1-2040 |
| Zdroj: | Applied Sciences, Vol 11, Iss 8245, p 8245 (2021) Applied Sciences Volume 11 Issue 17 |
| ISSN: | 2076-3417 |
| Popis: | PLA films, as non-absorbent materials, require modification of the surface before the printing process in order to improve the wettability of the substrate and to obtain proper ink adhesion to the substrate. In this paper, the surfaces of two kinds of PLA films were modified using plasma activation with parameters enabling high surface free energy (SFE) values, and then the films were printed on using different kinds of flexographic inks. Two gases, oxygen and argon, were used for activation, as these make it possible to obtain good hydrophilicity and high SFE values while having different effects on the roughness, or the degree of surface etching. Plasma-activated films were subsequently subjected to the measurements of: contact angle with water, diiodomethane and three printing inks, roughness, weight change, strength properties, color and gloss change, and SFE was determined. Unmodified and activated films were flexographically printed in laboratory conditions and then the quality of obtained prints was analyzed. The results showed a strong effect of activation with both oxygen and argon plasma on the SFE value of the films and the contact angles of water and inks, with the gas used for plasma activation and the type of film significantly influencing the thickness of the fused ink layer and the resultant color. Moreover, plasma activation had a especially favorable and significant effect on the quality of prints made with water-based inks, while it had little effect when printing with solvent-based inks. |
| Databáze: | OpenAIRE |
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