Monitoring heatset performance to control accumulation

Asko Sneck, Soile Passoja

Research output: Contribution to conferenceOther conference contributionScientificpeer-review

Abstract

The aim of this work was to clarify the mechanisms of accumulation build-up on heatset web offset press. The influence of press settings on accumulation tendency was also studied. On-line microscopic imaging system was used to monitor the state of the printing plate and blanket during printing. Images were taken from non-image, halftone and image areas. Press performance was followed during three different full-scale printings. According to results accumulation on blanket starts from plate conditions. Small ink particles detected on the non-image areas of the plate are transferred on the blanket surface causing accumulation build-up. Filamentation of ink emulsion at the nip exit gathers ink at the trailing edges of the image areas or even slightly over the edges. This leads to enrichment of the inked material at the trailing edges of the image areas and around the halftone dots on blanket surface. Nip pressure further enforces ink towards the edges of the image areas. The accumulated layer could be up to ten micrometres thick containing elements both from ink and paper. This can be especially harmful around the halftone dots as it can reduce the size of the printed dot during long print runs. Based on these findings mechanisms of heatset accumulation on ink transfer unit was clarified. On-line microscopic images from printing plate and blanket show that press settings have clear effect on accumulation tendency on blanket. Furthermore, the on-line imaging provides means to solve problematic accumulation related runnability issues of on-going offset process.
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

monitoring
image analysis
emulsions

Keywords

  • heatset
  • accumulation
  • linting
  • on-line monitoring

Cite this

Sneck, A., & Passoja, S. (2012). Monitoring heatset performance to control accumulation. PTS Symposium, Munich, Germany.
Sneck, Asko ; Passoja, Soile. / Monitoring heatset performance to control accumulation. PTS Symposium, Munich, Germany.
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keywords = "heatset, accumulation, linting, on-line monitoring",
author = "Asko Sneck and Soile Passoja",
note = "Project code: 78804 Project code: 78807; PTS Symposium : Paper and Imaging ; Conference date: 20-11-2012 Through 21-11-2012",
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Sneck, A & Passoja, S 2012, 'Monitoring heatset performance to control accumulation', PTS Symposium, Munich, Germany, 20/11/12 - 21/11/12.

Monitoring heatset performance to control accumulation. / Sneck, Asko; Passoja, Soile.

2012. PTS Symposium, Munich, Germany.

Research output: Contribution to conferenceOther conference contributionScientificpeer-review

TY - CONF

T1 - Monitoring heatset performance to control accumulation

AU - Sneck, Asko

AU - Passoja, Soile

N1 - Project code: 78804 Project code: 78807

PY - 2012

Y1 - 2012

N2 - The aim of this work was to clarify the mechanisms of accumulation build-up on heatset web offset press. The influence of press settings on accumulation tendency was also studied. On-line microscopic imaging system was used to monitor the state of the printing plate and blanket during printing. Images were taken from non-image, halftone and image areas. Press performance was followed during three different full-scale printings. According to results accumulation on blanket starts from plate conditions. Small ink particles detected on the non-image areas of the plate are transferred on the blanket surface causing accumulation build-up. Filamentation of ink emulsion at the nip exit gathers ink at the trailing edges of the image areas or even slightly over the edges. This leads to enrichment of the inked material at the trailing edges of the image areas and around the halftone dots on blanket surface. Nip pressure further enforces ink towards the edges of the image areas. The accumulated layer could be up to ten micrometres thick containing elements both from ink and paper. This can be especially harmful around the halftone dots as it can reduce the size of the printed dot during long print runs. Based on these findings mechanisms of heatset accumulation on ink transfer unit was clarified. On-line microscopic images from printing plate and blanket show that press settings have clear effect on accumulation tendency on blanket. Furthermore, the on-line imaging provides means to solve problematic accumulation related runnability issues of on-going offset process.

AB - The aim of this work was to clarify the mechanisms of accumulation build-up on heatset web offset press. The influence of press settings on accumulation tendency was also studied. On-line microscopic imaging system was used to monitor the state of the printing plate and blanket during printing. Images were taken from non-image, halftone and image areas. Press performance was followed during three different full-scale printings. According to results accumulation on blanket starts from plate conditions. Small ink particles detected on the non-image areas of the plate are transferred on the blanket surface causing accumulation build-up. Filamentation of ink emulsion at the nip exit gathers ink at the trailing edges of the image areas or even slightly over the edges. This leads to enrichment of the inked material at the trailing edges of the image areas and around the halftone dots on blanket surface. Nip pressure further enforces ink towards the edges of the image areas. The accumulated layer could be up to ten micrometres thick containing elements both from ink and paper. This can be especially harmful around the halftone dots as it can reduce the size of the printed dot during long print runs. Based on these findings mechanisms of heatset accumulation on ink transfer unit was clarified. On-line microscopic images from printing plate and blanket show that press settings have clear effect on accumulation tendency on blanket. Furthermore, the on-line imaging provides means to solve problematic accumulation related runnability issues of on-going offset process.

KW - heatset

KW - accumulation

KW - linting

KW - on-line monitoring

M3 - Other conference contribution

ER -

Sneck A, Passoja S. Monitoring heatset performance to control accumulation. 2012. PTS Symposium, Munich, Germany.