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Jürgen Gemeinhardt

Jürgen Gemeinhardt

Head of department
Printing techniques

E-mail
gemeinhardt
transparent 11x15@fogra.org

Telephone
+49 89. 431 82 - 256


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Current research projects (in the field "conventional printing technologies")

30.036
Extension of the quality assurance system of packaging printers to cover the production of foodstuff cardboard with a barrier layer

Timescale: 01.04.2014 to 31.03.2016
Funding:
Programme of the Federal Ministry of Economic Affairs and Energy for the support of "Industrielle Gemeinschaftsforschung (IGF)" via the German Federation of Industrial Research Associations (AiF)
Partner: Bundesverband Druck und Medien e.V.

The goal of the research project is to extend the quality assurance system for the production of mineral oil free foodstuff packaging so as to evaluate the effectiveness of barrier layers in foodstuff cartons. The project is a continuation of the "Development of a quality assurance system for the production of mineral oil free foodstuff packaging" research project and focuses on the prevention of mineral oil transfer through the application of additional barriers to the carton. The extension has become necessary as a result of new draft regulations from the consumer protection ministry that require a high level of security against the possible transfer of mineral oils from the packaging material used for foodstuff packaging. It will only be possible to fulfill these demanding requirements by using functional barriers on the inner side of the cartons or by using an inner bag with barrier properties inside the cartons.

Contact: Dr. Wolfgang Rauh

 

32.169
Reduction of 'Picture Framing' in sheet-fed offset printing through the appropriate choice of materials and application parameters

Timescale: 01.01.2016 to 31.12.2017
Funding:
Programme of the Federal Ministry of Economic Affairs and Energy for the support of "Industrielle Gemeinschaftsforschung (IGF)" via the German Federation of Industrial Research Associations (AiF)

Deposits outside the paper format, frequently referred to as 'Picture Framing', are now a problem for many sheet-fed offset printing companies. These particles can lead to an unwanted build-up on the blanket as well as on the impression cylinder, and the wash-up cycles that this makes necessary have a significant impact on the viability of print production. However, to date, there have been no suitable proposed solutions or preventive measures. Affected printers therefore have no alternative but to resort a process of individual trial and error in order to discover the best combinations of materials and press settings.
The aim of this research project is to achieve a better understanding of the mechanisms that lead to 'Picture Framing' and to draw up specific remedies by identifying and quantifying the parameters that have a significant influence. Particular attention will be paid to the damping budget, which will be checked for the first time in detail to see if it is correlated in any way with the phenomenon. The starting assumption is that this will be a key quantity both in relation to the occurrence and also the possible reduction of such disruptive build-up.

 

42.028
Modelling quantitative parameters in sheetfed offset printing on the basis of measurable paper properties

Timescale: 01.02.2016 to 31.01.2018
Funding:
Programme of the Federal Ministry of Economic Affairs and Energy for the support of "Industrielle Gemeinschaftsforschung (IGF)" via the German Federation of Industrial Research Associations (AiF)
Partner: Bundesverband Druck und Medien e.V.

This research project is intended to precisely identify the paper-related properties that influence solid colouring and tone value increase and for these to then be submitted as a proposal for adoption in ISO 15397. This standard specifies the paper properties to be communicated between manufacturers and printers and therefore offers one way of monitoring incoming materials so that potential printing problems can be picked up in advance. Quantifying the interrelationships should also make it possible to adopt appropriate press pre-sets for solid colouring and to make suitable adjustments to the tone value increase in the CTP RIP for the paper that is being used.
Results obtained as part of the planned research project should also make clear the extent to which it is possible to assign special substrates such as board, bulky papers or uncoated grades with compressed and smooth surfaces to the pre-existing types of paper. The key criterion for this will be the ability to achieve the specified solid colouring using typical offset printing ink layer thicknesses, whilst deviating tone value increase could be corrected for in practice in the RIP by means of the new algorithms that will be determined. It is possible that additional paper categories may need to be defined, and these could be introduced into the standardization process as a proposed amendment. The classification should be based on the properties of the materials that are found to be responsible for the achievable solid densities.



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