Time filter

Source Type

Mussbach-Winter U.,Fraunhofer Institute for Manufacturing Engineering and Automation | Schatz A.,Fraunhofer Institute For Produktionstechnik Und Automatisierung
Productivity Management | Year: 2010

ERP and MES, two IT solutions for production planning and control, generate the expected effort only under the condition of an optimized interface between both applications related to the allocation of functions and the data management. This contribution presents hints to design an efficient interface. © GITO-Verlag. Source

Eisele M.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Weskamp M.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Kraus M.,SiProM Services fur innovatives Projektmanagement GmbH
Productivity Management | Year: 2012

Manufacturing companies with a high share of value added in assembly have realized that productivity in series production can be considerably increased by a number of optimization approaches, such as value stream design or simulation techniques. Therefore, the question arises why this huge potential is only tapped into after the start of series production. As part of the research project NäGeMo, a new IT-based pre-series planning approach has been developed which unlocks the value-added potential for optimization even before series production is started. © GITO Verlag. Source

Pavuluri S.K.,Heriot - Watt University | Ferenets M.,Estonian Innovation Institute | Goussetis G.,Queens University of Belfast | Desmulliez M.P.Y.,Heriot - Watt University | And 5 more authors.
IEEE Transactions on Components, Packaging and Manufacturing Technology | Year: 2012

An open-ended microwave oven system is presented and characterized for the rapid encapsulation of microelectronic components. In situ real-time measurement of the temperature of the curing materials is carried out by an infrared pyrometer integrated in the microwave head of the oven. An automatic computer-controlled closed feedback loop has been used to measure the temperature in the curing material and modulate the system operating power to obtain predefined curing temperature cycles for efficient curing. Uniform curing of the encapsulant material is achieved with typical cure time of ∼300 s with a ramp rate of 1.66 °C/s and a hold period of ∼100 s. Differential scanning calorimeter based measurement for the curing of the polymer dielectric indicates a near 100% degree of cure. © 2011-2012 IEEE. Source

Bohem M.E.,University of Stuttgart | Bohem M.E.,Fraunhofer Institute For Produktionstechnik Und Automatisierung | Pook N.-P.,Clausthal University of Technology | Adam A.,Clausthal University of Technology | And 4 more authors.
Dyes and Pigments | Year: 2015

Longterm durability is a ubiquitous aim in coatings technology. Inorganic pigments are of great interest in this field because of their high photostability and their capability of preventing photodegradation. In this work, tetragonal (space group: P41) cerium(III)-doped La2[Si2O7] has been synthesized and applied as a novel protective pigment, with regards to stability and environmental friendliness. The characterization of the La2-xCex[Si2O7] system revealed relevant photoluminescence and scintillation properties. The non-centrosymmetric host lattice shows second-harmonic generation activity. The decay time of crystalline, non-hygroscopic powders of the compound was shown to be in a competitive range (<30 ns). Furthermore, the spectral patterns of the initial synthesis product could be maintained after particle size reduction and were also detectable after incorporation into a coating formulation, while avoiding a significant colour shift in the coated films. The potential of an innovative UV-protection concept for coatings, based on La2[Si2O7]:Ce3+ could be successfully pointed out. © 2015 Elsevier Ltd. All rights reserved. Source

Alig I.,Deutsches Kunststoff - Institute | Bargmann M.,Deutsches Kunststoff - Institute | Oehler H.,Deutsches Kunststoff - Institute | Lellinger D.,Deutsches Kunststoff - Institute | And 2 more authors.
Journal of Physics D: Applied Physics | Year: 2011

Scanning acoustic microscopy (SAM) was used to investigate disbonding, delamination and blister formation in polymer coatings for different layer structures and initial defect depths during exposure to a corrosive environment. The time evolution of disbonding and blister initiation and their growth was investigated by analysing the SAM images, taken after defined times of exposure to an electrolyte solution (Harrison solution). From investigations of a model system of coatings on steel substrates, it was possible to differentiate between water and/or ion transport (i) through the coating and (ii) along the coating-steel interface. For samples without clear coat randomly distributed blisters appeared at the coating-steel interface after exposure to the electrolyte solution, irrespective of the location of initial defects. The random distribution of growing blisters is related to diffusion of water and/or ions through the coating and 'nucleation' at weak points of the substrate or within the polymer. For samples with clear coat a propagating migration front along the coating-steel interface of 3-4μm height-starting from initial defects-was detected. The linear propagation of this front cannot be explained by Fickian diffusion. Therefore, it is discussed in terms of an accelerated diffusion or crack growth kinetics. Since blistering starts only at sites, where the migration front has passed, the presence of a thin water layer at the coating-steel interface, the loss of adhesion and the following corrosive processes are prerequisites for the nucleation of blisters. The blister growth shows a square-root time dependence. © 2011 IOP Publishing Ltd. Source

Discover hidden collaborations