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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")

34.021
Communication of characteristic values describing the metallic appearance of prints

Timescale: 01.11.2018 to 31.10.2020
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)

The goal of this research project is to establish objective characteristic values that correlate with the visual impression made by printed metallic surfaces. The aim is that it should be possible to measure these not just with specialist laboratory equipment but also by means of industry standard measurement devices and appropriate methods in support of production processes. It will allow metallic effects to be communicated simply by specifying target measurements in the same way as in standardized four-colour printing. Furthermore, the characteristic values should be scaled in such a way that they describe a perceptually uniform effects space. This should make it possible to specify aim values with sensible tolerances and to measure adherence to these values during quality control.
Existing approaches will also be built on in order to develop an appraisal technology that allows an unambiguous evaluation of the metallic effect. The focus here will be on determining various combinations of lighting and observation angles when using directed illumination. Practical recommendations will also be developed to enable users to carry out the best possible visual examination even without a dedicated viewing booth.

 

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 31.03.2018
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)

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 30.04.2018
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.

 

42.029
Laboratory method for the practical and reproducible determination of the residual strength of heat set web offset papers

Timescale: 01.04.2015 to 30.09.2017
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)

In heatset web offset printing a web of paper is fed through the press at high speed, running first through the printing units before reaching a hot air dryer in which the high boiling point mineral oils are evaporated from the inks. In the process, the papers are heated to well in excess of 100 °C losing a considerable quantity of water and becoming brittle.
The combination of this brittleness and the mechanical stresses during folding result in a significant reduction in the paper's strength and, if the residual strength is insufficient, the fold can break. If this is noticed during the production run all the printer can do is to attempt to counter it by reducing the printing speed or the hot air temperature. However, the problem is not usually noticed until it is too late and individual pages drop out of a finished, stapled or stitched printed product.
An existing laboratory method for determining the residual strength of heatset offset webs will be developed as part of the research project so that it reflects actual production printing condition. The new method should be accompanied by revised limits. In addition, the factors that influence laboratory results will be investigated in detail. This will allow specifications to be developed for the test procedure that ensure comparability with results from various different paper laboratories.



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