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Modelling and Control of the Web-Fed Offset Newspaper Printing Press
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).ORCID iD: 0000-0003-2185-8973
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).ORCID iD: 0000-0002-1043-8773
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
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2003 (English)In: Proceedings of the Technical Association of the Graphic Arts, TAGA, Technical Association of the Graphic (TAGA) , 2003, 27-29 p.Conference paper, Published paper (Refereed)
Abstract [en]

We present an approach to modelling and controlling the web-fed offset printing process. An image processing and artificial neural networks based device is used to measure the printing process output - the observable variables. The observable variables are measured on halftone areas and integrate information about both ink densities and dot sizes. From only one measurement the device is capable of estimating the actual relative amount of each cyan, magenta, yellow, and black ink dispersed on paper in the measuring area. We build and test linear and non-linear printing press models using the measured variables andother parameters characterising the press. The observable variables measured and the press model developed are then further used by a control unit for generating control signals - signals for controlling the ink keys - to compensate for colour deviation. The experimental investigations performed have shown that the non-linear model developed is accurate enough to be used in a control loop for controlling the printing process. The control accuracy - the tracking accuracy of the desired ink level - obtained from the controller was higher than that observed when controlling the press by the operator.

Place, publisher, year, edition, pages
Technical Association of the Graphic (TAGA) , 2003. 27-29 p.
Keyword [en]
Colour control, Neural network, Newsprint
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hh:diva-19715Scopus ID: 2-s2.0-1942421673OAI: oai:DiVA.org:hh-19715DiVA: diva2:556067
Conference
2003 Proceedings-Technical Associations of the Graphic Arts, TAGA, Montreal, Canada
Available from: 2012-09-24 Created: 2012-09-24 Last updated: 2016-02-24Bibliographically approved
In thesis
1. Using multicoloured halftone screens for offset print quality monitoring
Open this publication in new window or tab >>Using multicoloured halftone screens for offset print quality monitoring
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In the newspaper printing industry, offset is the dominating printing method and the use of multicolour printing has increased rapidly in newspapers during the last decade. The offset printing process relies on the assumption that an uniform film of ink of right thickness is transferred onto the printing areas. The quality of reproduction of colour images in offset printing is dependent on a number of parameters in a chain of steps and in the end it is the amount and the distribution of ink deposited on the substrate that create the sensation and thus the perceived colours. We identify three control points in the offset printing process and present methods for assessing the printing process quality in two of these points:

• Methods for determining if the printing plates carry the correct image

• Methods for determining the amount of ink deposited onto the newsprint

A new concept of colour impression is introduced as a measure of the amount of ink deposited on the newsprint. Two factors contribute to values of the colour impression, the halftone dot-size and ink density. Colour impression values are determined on gray-bars using a CCD-camera based system. Colour impression values can also be determined in an area containing an arbitrary combination of cyan magenta and yellow inks. The correct amount of ink is known either from a reference print or from prepress information. Thus, the deviation of the amount of ink can be determined that can be used as control value by a press operator or as input to a control system.

How a closed loop controller can be designed based on the colour impression values is also shown.

It is demonstrated that the methods developed can be used for off-line print quality monitoring and ink feed control, or preferably in an online system in a newspaper printing press.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2005. 48 p.
Series
Linköping studies in science and technology. Licentiate thesis, ISSN 0280-7971 ; 1147
Keyword
Multicolour printing, Printing process, Colour images, Colour impression, CCD-camera
National Category
Computer Engineering
Identifiers
urn:nbn:se:hh:diva-713 (URN)2082/1062 (Local ID)91-85297-25-9 (ISBN)2082/1062 (Archive number)2082/1062 (OAI)
Presentation
2005-02-10, 00:00 (English)
Supervisors
Note

Report code: LiU-TEK-LIC-2005:02

Available from: 2007-06-04 Created: 2007-06-04 Last updated: 2014-11-10Bibliographically approved

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Bergman, LarsVerikas, AntanasEnglund, Cristofer
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