Analysis of nip flow operations involving a viscoelastic roller

Dobbels, Frans; Mewis, Jan

doi:10.1016/0009-2509(78)80009-8

Cited by 8 publications

(2 citation statements)

References 21 publications

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“…A modern flexographic printing process can run with a web-speed of several hundreds of meters per minute, meaning that the substrate is only in contact with the print nip for a few milliseconds during ink transfer. The pressure profile of a soft nip has been shown both experimentally [1]- [5] and numerically [6]- [9]. The impression or pressure in a flexographic print nip is very soft in comparison to other contact printing methods.…”

Section: Introductionmentioning

confidence: 96%

Mechanical Response of Paperboard in Rapid Compression – The Rapid ZD-Tester, A Measurement Technique

Rydefalk,

Hagman,

Yang

et al. 2022

Trans. Of the XVIIth Fund. Res. Symp. Cambridge, 2022

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Paperboard is a common material for packages and other carriers of information. During rotary printing processes, the paperboard is subjected to rapid deformations in the out-of-plane direction as it passes through the nip between the rolls of the printer. Being viscoelastic in nature, the mechanical response of the material to high deformation rates differs from what is measured with conventional testing conducted at slower deformation rates. In this work, a device called the rapid ZD-tester is used to show the response of paperboards subjected to a rapid pressure pulse and compare this to measurements made at lower strain rates in a common universal testing machine. All the tested paperboards show complete recovery within 5 s when being rapidly compressed, while the slower compression to the same pressure leaves a deformation that remains after 5 s. The stiffness response differs between the paperboards, but does not consistently increase or decrease between slow or rapid compressions. The difference in response between slow and rapid compression appears larger for the low-density paperboard in the study. The time scales in the rapid ZD-tester are comparable to those in a printing press, and, therefore, evaluation of the material response of the paperboard measured by this device is relevant in the context of printing applications.

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Section: Introductionmentioning

confidence: 96%

Mechanical Response of Paperboard in Rapid Compression – The Rapid ZD-Tester, A Measurement Technique

Rydefalk,

Hagman,

Yang

et al. 2022

Trans. Of the XVIIth Fund. Res. Symp. Cambridge, 2022

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show abstract

“…They showed that the use of thin cover material reduces the coating film thickness. Dobbels and Mewis (1978) modeled the hydrodynamics of fluid flowing between rotating viscoelastic rolls. In their model, they imposed an orthogonal collocation for the roll deformation in the nip and also specified that the roll deflection at the inlet region as independent variable.…”

Section: Introductionmentioning

confidence: 99%