Ink receptivity on paper - characterization of paper materials
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English Slovak |
| ISSN: | 0927-7757 |
| Online Access: | http://www.viks.sk/chk/colandsurf_2000.doc |
| Abstract: | SUMMARIES. The rheological behaviour of three black offset inks was tested using viscometer with the cone and plate geometry. The shear stress versus shear rate measurements confirmed that the investigated offset inks represent similar viscoelastic, pseudoplastic fluids, forming thixotropic structure. Mileage and ink transfer curves were measured onto the paper materials with different properties. The analysis of experimental results using Tollenaar-Ernst and modified Walker-Fetsko equations established the substantial role of the paper characteristics such as smoothness, brightness and penetration in the process of ink film formation on paper substrates during printing. CONCLUSION. The investigated offset inks represent viscoelas-tic, pseudoplastic fluids, forming thixotropic structure. The rheological behaviour of these inks is similar and the experimental shear stress versus shear rate curves can be described using Ostwald, Casson or Cross flow models. The mileage curves measured using IGT offset ink on the different paper materials were analyzed using Tollenaar-Ernst equation (Eq. (1)), and both saturation optical density and m parameter were calculated. The paper properties such as smoothness, brightness, penetration determine the values of m parameter, as well as influence the saturation optical density. The process of ink transfer from the plate to paper was described using modified Walker-Fet-sko equation (Eqs. (2) and (5)). The results obtained confirmed again the dominant role of paper penetration in the ink transfer process. |
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| ISSN: | 0927-7757 |
