The influence of backpressure on ink drying and dot gain in sheet fed offset printing
2004 (English)In: ADVANCES IN PRINTING AND MEDIA TECHNOLOGY, VOL XXXIII, Zagreb: ACTA GRAPHICA PUBL , 2004, Vol. 33, 245-253 p.Conference paper (Refereed)
Preliminary test printing indicated that increasing the impression of the paper against the blanket cylinder in sheet-fed offset printing might lead to a faster ink drying. Therefore in order to verify the results a new test run was carried out based on print trials using a Solna 424 sheet-fed press where the impression was adjusted from low to high values. Three paper grades, gloss coated, silk coated and uncoated grades were printed with two blankets with different hardness. Ink drying was measured as rub-off at time intervals so that drying curves Could be plotted. The ink transfer was measured by using XRF, x-ray fluorescent technology. Print density and dot gain was measured in 100%, 80% and 40% dot area. The results from the drying evaluation disagree with the results from the preliminary test printing, no correlation between drying rate and level of impression was found. The results from the dot gain measurements show that the dot gain is not increased with increased level of impression, it remains on a constant value.
Place, publisher, year, edition, pages
Zagreb: ACTA GRAPHICA PUBL , 2004. Vol. 33, 245-253 p.
, ADVANCES IN PRINTING SCIENCE AND TECHNOLOGY
Media and Communications
IdentifiersURN: urn:nbn:se:kth:diva-30794ISI: 000267935100023ISBN: 978-953-7292-03-4OAI: oai:DiVA.org:kth-30794DiVA: diva2:403683
33rd International Research Conference of Iarigai/International-Association-of-Research-Organization-for-the-Information-Media-and-Graphic-Arts-Industries
QC 201103142011-03-142011-03-042012-01-04Bibliographically approved