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Printing Dynamics: Nip Pressure and Its Relationship with Materials’ Viscoelasticity
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.ORCID iD: 0000-0003-1501-2912
2020 (English)In: Journal of Packaging Technology and Research, ISSN 2520-1034, Vol. 4, p. 145-156Article in journal (Refereed) Published
Abstract [en]

A theoretical framework of nip dynamics of conventional printing, including dynamic models deducted from nip geometry,printing speed, and physics laws, is proposed. Different from previous works, the present work focuses at obtaining the nippressure from a given nip geometric setting, the common way in full-scale printing. The effects of viscoelastic characteristicsof paper substrate and print form (rubber and/or polymer) on the nip pressure, which become pronounced in a full-scale printingprocess due to high speed, are accounted and illustrated by three physical models, e.g., Maxwell model, Kelvin–Voigtmodel, and Burgers model. Details of the nip dynamic features, shape, amplitude, duration, and effective nip width, etc.,have been worked out. The viscoelastic nature of the materials was found to be responsible for the so-called speed-hardening,asymmetric nip profile, variations in the nip amplitude and effective nip width, etc. It was also found that how the viscoelasticproperties of the materials affect the nip dynamics depend on the how the elastic components and the viscos count parts areconnected with each other. The framework is applicable to calendaring, gravure, offset, and flexography.

Place, publisher, year, edition, pages
2020. Vol. 4, p. 145-156
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-45369DOI: 10.1007/s41783-020-00091-zOAI: oai:DiVA.org:ri-45369DiVA, id: diva2:1454995
Available from: 2020-07-21 Created: 2020-07-21 Last updated: 2023-05-25

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Yang, Li

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