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Ink cohesion phenomena and possibilities for their standardized evaluation


Research report

70.005

Author

Bartl, J.; Bertholdt, U.; Müller, A.; Kühnöl, K.

Year of publication

2017

Abstract

This project involved specimens printed by every printing method being investigated by the prüfbau Quartant, IGT RT 4, Danilee Sutherland 2000 and James Heal Midi-Martindale abrasion testers. 60 sheet-fed offset printed specimens formed the focus of the investigation. The sheet-fed printed specimens were tested under 35 test conditions.

All the abrasion test results were visually evaluated and ranked by several persons. The abrasion test results of the Quartant were investigated by means of scanning density measurement, colour measurement under diffuse sample illumination and scanner-based image analysis employing the PTS DOMAS system. All abrasion test results were also investigated by means of a further image analysis system, the prüfbau Print target. In no instance was it possible to establish a reliable correlation between quantitative optical methods and the visual evaluations.

This lack of correlation prevented the planned multi-dimensional correlation approach for determining the importance of the various material parameters on the abrasion test results. The static and dynamic friction coefficients were determined for all print specimens. Here too it was not possible to establish correlations with the visual rankings. Using the dynamic friction coefficients as a basis, the friction work on all the testers was calculated under selected test conditions.

Selected print and abrasion specimens from the prüfbau Quartant were characterized for the their roughness, elasticity and porosity. There were no direct correlations with the visual abrasion test rankings.

In principle, the abrasion test results depend upon the choice of tester and the test conditions. Systematic influences have only been established in relation to the abrading material. The impact of variations in such test parameters as the pressure applied to the specimen, the number of strokes, the test movement and ambient conditions differ from specimen to specimen. Test speed had no influence on the test results.

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