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Dr Phillipp Stolper

Dr Philipp Stolper

Department
Materials & Environment

E-mail
stolper
transparent 11x15@fogra.org

Telephone
+49 89. 431 82 - 354

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Current research projects (in the field "ink, paper and environment")

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: bvdm German Printing and Media Industries Federation

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.

 

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.

Contact: Jürgen Gemeinhardt

 

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.

Contact: Jürgen Gemeinhardt

 

50.042
Determination of key data for the standardization of inks for waterless offset

Timescale: 01.01.2014 to 31.12.2016
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: bvdm German Printing And Media Industries Federation

Waterless offset allows the high quality production of both newspapers and other printed products at an economical cost. The disadvantage is that the entire process requires a high degree of standardization, since there are very few options for the printer to intervene in the event of printing problems. Take, for example, conditions in the press ink unit. In order to maintain consistent print quality, it is necessary to install complex temperature regulation systems to keep the working temperature to within tolerances of ± 0.1 °C, and these consume considerable amounts of energy. The research project will investigate whether the standardization of various ink properties will allow this working tolerance to be broadened.

 

67.012
Development of a water-based cleaning process for press casings

Timescale: 01.12.2013 to 30.11.2015
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)

Research cooperation with wfk – Cleaning Technology Institute, Krefeld

The scientific and technical findings should result in a cleaning process for press casings based on extremely hydrophobic, amphiphilic, micro-porous soil release hydrogels that makes it a simple matter to clean press casings without the need for dangerous chemicals. The hydro gels offer a fast, simple and cost-effective water-based alternative to the cleaning processes that are currently used. As a result of the absence of solvents, the new process is excellent in terms of human toxicity and environmental friendliness. It will offer the printing industry and its cleaning service providers an effective and economical means of removing stubborn inks and coatings from press casings.

 



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