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The effect of local moisture variations on fluting in heatset web offset printing
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
2005 (English)In: Proc. of 5th Biennial Johan Gullichsen Colloquium, 2005Conference paper, (Other scientific)
Abstract [en]

The effect of micro scale variations on fluting formation has been studied by using quasi-static post-buckling analyses. The analyses are based on implicit time integration techniques and incorporated the ink stiffening effect during drying in the heatset oven. A series of parametric studies have been conducted to investigate effects of bending stiffness, ink thickness, tension, and scale of moisture variations. Experiments were also performed to estimate the ink layer stiffness after drying and to investigate the retention of flutes after printing. The results showed that, in order to explain the occurrence of flutes in the wavelength of 1-2 cm, micro-scale strain variations are necessary. Such variations are most likely caused by the local moisture variations and the subsequent plastic deformation of paper due to heating. Ink stiffening alone was found to be insufficient to retain the fluting shapes after drying.

Place, publisher, year, edition, pages
2005.
Keyword [en]
Fluting, strain/moisture variations, drying
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-3428Local ID: 3422OAI: oai:DiVA.org:miun-3428DiVA: diva2:28460
Available from: 2008-09-30 Created: 2008-09-30Bibliographically approved

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