Statuskonferenz Bioenergie, Leipzig

H2.INSIGHTS#6 des Zentrum Wasserstoff

Statuskonferenz Bioenergie, Leipzig

Sommerakademie; Hof 

Process mining has emerged as a powerful technique for analyzing and improving business processes. In this research paper, the application of process mining in a vertically integrated small-scale smart factory is explored. The study aims to identify challenges, analyze data issues, and explore the potential of process mining as a tool for process optimization. Employing a case study approach, data is collected from the entire process and analyzed using process mining software. The findings show how to use data to enable process mining in current scenarios. Challenges related to data synchronization and the impact of network delays on data accuracy are revealed. However, despite the challenges identified, this research demonstrates the potential of process mining to drive process optimization in smart factory environments. This paper contributes to the field of process mining and provides valuable information for academia and industry professionals seeking to optimize production processes through data-driven analysis in the era of Industry 4.0.

The paper presents SPORE, a Spatial Recommender System. As we enter a period of unprecedented collaboration between authors and computers, where artificial intelligence in particular seems likely to act increasingly in a co-authoring capacity, SPORE offers a different approach to collaboration. More organic and exploratory than other automated or procedural systems, SPORE aims to mimic the process of storybreaking that already exists in the creative industries.

Vladimir Propp (1895–1970) was a Russian folklorist, who identified what he considered the 31 fundamental actions of major characters and their consequences for a story, actions which he called functions. This paper focuses on one specific part of this principle—spheres of action—and considers how they might be explored using SPORE and its underlying infrastructure Mother, a spatial hypertext-based recommender system developed by the authors.

Bioplastics research is currently challenged by high material prices and limited availability of biopolymers. For state-of-the-art compounding using a twin-screw extruder, even on lab-scale, large quantities of material are required. Poly(3-hydroxy-buthyrate) and its copolymers such as PHBV are promising biopolymers but are prone to degradation. The stabilizers used must also be biobased to ensure the sustainability of the material. In this study, a new material-saving process for the compounding of biocomposites was evaluated to investigate the potential of biogenic by-products from the winemaking industry to improve the stability of biopolyesters. Formulations based on PHBV powder and two different varieties of pulverized wine grape pomace with filler contents up to 10 wt.-% were prepared. The materials were processed on a modified miniaturized single-screw extruder with an L/D ratio of 15 equipped with a mixing screw and compared to a lab-scale twin-screw extruder with an L/D ratio of 44. Both extruders have screw diameters of 20 mm. Thermal and rheological properties of the compounded material were determined using standard polymer analyzing techniques such as GPC, MFR, DSC, TGA and OIT. The mixing quality of both extruder types was evaluated by light microscopy imaging. The results show that a miniaturized single-screw extruder represents an efficient alternative for research purposes, but minor differences in the dominant degradation mechanisms during processing must be considered for data evaluation. Especially for small quantities and frequent material changes, the miniaturized single-screw extruder is a beneficial option, reducing the limits of bioplastics research and contributing to its progress. Thermal analysis revealed that the wine-derived biogenic by-products act as antioxidant stabilizers preventing thermo-oxidative degradation of PHBV, representing sustainable biobased alternatives to synthetic stabilizers.

Bio-based polyamide 10.10 (PA 10.10) has excellent properties compared to other biobased  polymers such as polylactic acid (PLA) or polyhydroxyalkanoates (PHAs) and is therefore used in more technical applications where higher strength is required. For foam and filament extrusion,a good balance between strength and stiffness of the  polymer is needed. Therefore, two commercial chain-extenders (Joncryl® ADR types) with different epoxy functionalities are used to modify the melt properties of PA 10.10. The chain-extenders are used in a concentration range up to 1.25 wt.%. The range of glass transition temperature widens with increasing Joncryl® content, and the apparent activation energy shows a maximum at a concentration of 0.5 wt.%. Furthermore, the melting temperatures are constant and the crystallinity decreases with increasing chain-extender content due to the formation of branches. During the second heating run, a bimodal melting peak appeared, consisting of 𝛼-triclinic and pseudo 𝛾-hexagonal crystals. The weight average molar masses (Mw) measured by gel permeation chromatography (GPC) increased linearly with increasing ADR 4400 content. In contrast, the compounds containing ADR 4468 show a maximum at 0.5 wt.% and it begins to decrease thereafter. The rheological data show an increase in viscosity with increasing chainextender content due to branch formation. ATR spectra of the compounds show a decrease at the wavelength of the primary (3301 cm−1) and secondary (1634 cm−1) (-NH stretching in PA 10.10) amine, indicating that chain-extension, e.g., branching, takes place during compounding.