Ink lifting efficiency from engraved cells under electric field

Asko Sneck, Yingfeng Shen, Jorma T. Koskinen, Soile Passoja

Research output: Contribution to conferenceOther conference contributionScientificpeer-review

Abstract

We endeavour to clarify the effect of electric field on speed and height of ink lifting from differently engraved gravure cells. The main emphasis is directed to the shape of the cell, whether it has sloped or vertical walls. Furthermore, the influence of ink and substrate properties as well as patterns and defects in the substrate on electric field assisted ink lifting was studied. An extensive set of numerical simulations was carried out and the results were verified by experimental studies. A model was developed to illustrate ink movements in a cell approaching the nip. Laboratory arrangements were set up to image electric field assisted ink lifting from the side using scaled-up V- and U-shaped grooves. Transparent impression roller arrangements were used to monitor ink lifting and formation of ink-substrate contact using electromechanically engraved and laser etched gravure cylinders. According to our simulations and experiments, ink first moves towards the front edge of the cell where the effect of the electric field is the strongest. As the influence of the electric field at the trailing edge of the cell increases the ink is also lifted from that side and an ink meniscus is formed inside the cell. The transparent impression roller images proved the forming of an ink meniscus inside the cell thus predicting printed doughnut dots. Based on the simulations, a void on the substrate has an influence on ink lifting depending on position of the void relative to the front edge of the cell. This could be one explanation to missing dots. The model provides excellent possibilities to study the influence of the process parameters on ink lifting and, in general, liquid movements in electric field. The laboratory arrangements can be utilized in different gravure applications especially when compatibility of materials or the influence of electric field is studied.
Original languageEnglish
Publication statusPublished - 2012
MoE publication typeNot Eligible
EventPTS Symposium: Paper and Imaging - Munich, Germany
Duration: 20 Nov 201221 Nov 2012

Conference

ConferencePTS Symposium
CountryGermany
CityMunich
Period20/11/1221/11/12

Fingerprint

Ink
Electric fields
Substrates

Keywords

  • gravure printing
  • electric field assistance
  • ink lifting
  • simulation
  • monitoring

Cite this

Sneck, A., Shen, Y., Koskinen, J. T., & Passoja, S. (2012). Ink lifting efficiency from engraved cells under electric field. PTS Symposium, Munich, Germany.
Sneck, Asko ; Shen, Yingfeng ; Koskinen, Jorma T. ; Passoja, Soile. / Ink lifting efficiency from engraved cells under electric field. PTS Symposium, Munich, Germany.
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abstract = "We endeavour to clarify the effect of electric field on speed and height of ink lifting from differently engraved gravure cells. The main emphasis is directed to the shape of the cell, whether it has sloped or vertical walls. Furthermore, the influence of ink and substrate properties as well as patterns and defects in the substrate on electric field assisted ink lifting was studied. An extensive set of numerical simulations was carried out and the results were verified by experimental studies. A model was developed to illustrate ink movements in a cell approaching the nip. Laboratory arrangements were set up to image electric field assisted ink lifting from the side using scaled-up V- and U-shaped grooves. Transparent impression roller arrangements were used to monitor ink lifting and formation of ink-substrate contact using electromechanically engraved and laser etched gravure cylinders. According to our simulations and experiments, ink first moves towards the front edge of the cell where the effect of the electric field is the strongest. As the influence of the electric field at the trailing edge of the cell increases the ink is also lifted from that side and an ink meniscus is formed inside the cell. The transparent impression roller images proved the forming of an ink meniscus inside the cell thus predicting printed doughnut dots. Based on the simulations, a void on the substrate has an influence on ink lifting depending on position of the void relative to the front edge of the cell. This could be one explanation to missing dots. The model provides excellent possibilities to study the influence of the process parameters on ink lifting and, in general, liquid movements in electric field. The laboratory arrangements can be utilized in different gravure applications especially when compatibility of materials or the influence of electric field is studied.",
keywords = "gravure printing, electric field assistance, ink lifting, simulation, monitoring",
author = "Asko Sneck and Yingfeng Shen and Koskinen, {Jorma T.} and Soile Passoja",
year = "2012",
language = "English",
note = "PTS Symposium : Paper and Imaging ; Conference date: 20-11-2012 Through 21-11-2012",

}

Sneck, A, Shen, Y, Koskinen, JT & Passoja, S 2012, 'Ink lifting efficiency from engraved cells under electric field' PTS Symposium, Munich, Germany, 20/11/12 - 21/11/12, .

Ink lifting efficiency from engraved cells under electric field. / Sneck, Asko; Shen, Yingfeng; Koskinen, Jorma T.; Passoja, Soile.

2012. PTS Symposium, Munich, Germany.

Research output: Contribution to conferenceOther conference contributionScientificpeer-review

TY - CONF

T1 - Ink lifting efficiency from engraved cells under electric field

AU - Sneck, Asko

AU - Shen, Yingfeng

AU - Koskinen, Jorma T.

AU - Passoja, Soile

PY - 2012

Y1 - 2012

N2 - We endeavour to clarify the effect of electric field on speed and height of ink lifting from differently engraved gravure cells. The main emphasis is directed to the shape of the cell, whether it has sloped or vertical walls. Furthermore, the influence of ink and substrate properties as well as patterns and defects in the substrate on electric field assisted ink lifting was studied. An extensive set of numerical simulations was carried out and the results were verified by experimental studies. A model was developed to illustrate ink movements in a cell approaching the nip. Laboratory arrangements were set up to image electric field assisted ink lifting from the side using scaled-up V- and U-shaped grooves. Transparent impression roller arrangements were used to monitor ink lifting and formation of ink-substrate contact using electromechanically engraved and laser etched gravure cylinders. According to our simulations and experiments, ink first moves towards the front edge of the cell where the effect of the electric field is the strongest. As the influence of the electric field at the trailing edge of the cell increases the ink is also lifted from that side and an ink meniscus is formed inside the cell. The transparent impression roller images proved the forming of an ink meniscus inside the cell thus predicting printed doughnut dots. Based on the simulations, a void on the substrate has an influence on ink lifting depending on position of the void relative to the front edge of the cell. This could be one explanation to missing dots. The model provides excellent possibilities to study the influence of the process parameters on ink lifting and, in general, liquid movements in electric field. The laboratory arrangements can be utilized in different gravure applications especially when compatibility of materials or the influence of electric field is studied.

AB - We endeavour to clarify the effect of electric field on speed and height of ink lifting from differently engraved gravure cells. The main emphasis is directed to the shape of the cell, whether it has sloped or vertical walls. Furthermore, the influence of ink and substrate properties as well as patterns and defects in the substrate on electric field assisted ink lifting was studied. An extensive set of numerical simulations was carried out and the results were verified by experimental studies. A model was developed to illustrate ink movements in a cell approaching the nip. Laboratory arrangements were set up to image electric field assisted ink lifting from the side using scaled-up V- and U-shaped grooves. Transparent impression roller arrangements were used to monitor ink lifting and formation of ink-substrate contact using electromechanically engraved and laser etched gravure cylinders. According to our simulations and experiments, ink first moves towards the front edge of the cell where the effect of the electric field is the strongest. As the influence of the electric field at the trailing edge of the cell increases the ink is also lifted from that side and an ink meniscus is formed inside the cell. The transparent impression roller images proved the forming of an ink meniscus inside the cell thus predicting printed doughnut dots. Based on the simulations, a void on the substrate has an influence on ink lifting depending on position of the void relative to the front edge of the cell. This could be one explanation to missing dots. The model provides excellent possibilities to study the influence of the process parameters on ink lifting and, in general, liquid movements in electric field. The laboratory arrangements can be utilized in different gravure applications especially when compatibility of materials or the influence of electric field is studied.

KW - gravure printing

KW - electric field assistance

KW - ink lifting

KW - simulation

KW - monitoring

M3 - Other conference contribution

ER -

Sneck A, Shen Y, Koskinen JT, Passoja S. Ink lifting efficiency from engraved cells under electric field. 2012. PTS Symposium, Munich, Germany.