Product category:
Printing Substrates - Paper, Forms and Stationery
News Release from: M-real
Edited by the Printingtalk Editorial
Team on 22 January 2008
Ghosting And Vanishing Dots Problems
Solution Near
Reductions in press downtime and maculation in heatset web offset printing are claimed to have been achieved through a new understanding about managing ghosting and vanishing dot phenomena.
Those problems are said to be especially prevalent in jobs with high quality layout and photographs According to paper producer M-real, trials have shown that the achievements so far is progressing towards minimisation of the problems
This article was originally published on Printingtalk on 24 Jun 2004 at 8.00am (UK)
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M-real is involved in a working party that comprises ink company Sun Chemical, blanker manufacturer Contitech and Kodak Polychrome, the plates producer, as well as press manufacturer MAN Roland, that is focusing on the project.
The company added that until now the only solution is to wash the blankets, causing press downtime and maculation.
Register moving devices, such as auto-cycling systems, can prolong the intervals between washing but do not cure the problem.
As a result of trials run with German printers to identify the root cause of the phenomena, the working party has found that ghosting and vanishing dot are caused by depositions on the blanket.
They start from the dot's edges and gradually eat in to the dot as printing proceeds and in that way the printed dot becomes smaller.
M-real added that as trials continued, improved combinations of paper, ink, fount, blanket and plate were evaluated so that the optimum configuration to counter the problems could be found.
In the most recent test, use of the optimum configuration resulted in no ghost appearing in the print run and dot gain was improved, whilst washing intervals could be minimised.
That was compared to a control print run, using a standard configuration, where both problems occurred.
Further customer trials are scheduled to verify the results and gather more information about the role played by each component in the printing process and updates are expected to be announced in the spring, said M-real.
The working party, first established in 2005, includes 13 representatives from Sun Chemical, Contitech, Kodak Polychrome, M-real, and MAN Roland.
The full report may be obtained from M-real Graphic Papers.
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